diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/taler_util.h | 12 | ||||
| -rwxr-xr-x | src/testing/taler-unified-setup.sh | 6 | ||||
| -rw-r--r-- | src/util/Makefile.am | 15 | ||||
| -rw-r--r-- | src/util/secmod_cs.c | 2252 | ||||
| -rw-r--r-- | src/util/secmod_eddsa.c | 1130 | ||||
| -rw-r--r-- | src/util/secmod_rsa.c | 2053 | ||||
| -rw-r--r-- | src/util/taler-exchange-secmod-cs.c | 2286 | ||||
| -rw-r--r-- | src/util/taler-exchange-secmod-eddsa.c | 1147 | ||||
| -rw-r--r-- | src/util/taler-exchange-secmod-rsa.c | 2077 |
9 files changed, 5487 insertions, 5491 deletions
diff --git a/src/include/taler_util.h b/src/include/taler_util.h index 1c65610b3..527a34d9e 100644 --- a/src/include/taler_util.h +++ b/src/include/taler_util.h @@ -912,7 +912,7 @@ struct TALER_SECMOD_Options * Number of workers to launch. Note that connections to * exchanges are NOT workers. */ - unsigned int max_workers = 16; + unsigned int max_workers; /** * Time when the key update is executed. @@ -931,6 +931,12 @@ struct TALER_SECMOD_Options */ const char *section; + /** + * Return value from main(). + */ + int global_ret; + + }; #define TALER_SECMOD_OPTIONS(opt) \ @@ -940,12 +946,12 @@ struct TALER_SECMOD_Options "time", \ "TIMESTAMP", \ "pretend it is a different time for the update", \ - &opt->global_now_tmp), \ + &(opt)->global_now_tmp), \ GNUNET_GETOPT_option_uint ('w', \ "workers", \ "COUNT", \ "use COUNT workers for parallel processing of batch requests", \ - &opt->max_workers) + &(opt)->max_workers) /** diff --git a/src/testing/taler-unified-setup.sh b/src/testing/taler-unified-setup.sh index 5a95f8f17..87829c244 100755 --- a/src/testing/taler-unified-setup.sh +++ b/src/testing/taler-unified-setup.sh @@ -542,9 +542,9 @@ then DONAU_URL="http://localhost:${DONAU_PORT}/" fi donau-dbinit -c "$CONF" --reset - $USE_VALGRIND taler-exchange-secmod-eddsa -c "$CONF" -L "$LOGLEVEL" -s donau 2> donau-secmod-eddsa.log & - $USE_VALGRIND taler-exchange-secmod-rsa -c "$CONF" -L "$LOGLEVEL" -s donau 2> donau-secmod-rsa.log & - $USE_VALGRIND taler-exchange-secmod-cs -c "$CONF" -L "$LOGLEVEL" -s donau 2> donau-secmod-cs.log & + $USE_VALGRIND donau-secmod-eddsa -c "$CONF" -L "$LOGLEVEL" 2> donau-secmod-eddsa.log & + $USE_VALGRIND donau-secmod-rsa -c "$CONF" -L "$LOGLEVEL" 2> donau-secmod-rsa.log & + $USE_VALGRIND donau-secmod-cs -c "$CONF" -L "$LOGLEVEL" 2> donau-secmod-cs.log & $USE_VALGRIND donau-httpd -c "$CONF" -L "$LOGLEVEL" 2> donau-httpd.log & echo " DONE" fi diff --git a/src/util/Makefile.am b/src/util/Makefile.am index 200955616..b4315ddea 100644 --- a/src/util/Makefile.am +++ b/src/util/Makefile.am @@ -48,11 +48,8 @@ taler_exchange_config_LDADD = \ -lgnunetutil \ $(XLIB) - - taler_exchange_secmod_rsa_SOURCES = \ - taler-exchange-secmod-rsa.c taler-exchange-secmod-rsa.h \ - secmod_common.c secmod_common.h + taler-exchange-secmod-rsa.c taler-exchange-secmod-rsa.h taler_exchange_secmod_rsa_LDADD = \ libtalerutil.la \ -lgnunetutil \ @@ -61,8 +58,7 @@ taler_exchange_secmod_rsa_LDADD = \ $(XLIB) taler_exchange_secmod_cs_SOURCES = \ - taler-exchange-secmod-cs.c taler-exchange-secmod-cs.h \ - secmod_common.c secmod_common.h + taler-exchange-secmod-cs.c taler-exchange-secmod-cs.h taler_exchange_secmod_cs_LDADD = \ libtalerutil.la \ -lgnunetutil \ @@ -71,8 +67,7 @@ taler_exchange_secmod_cs_LDADD = \ $(XLIB) taler_exchange_secmod_eddsa_SOURCES = \ - taler-exchange-secmod-eddsa.c taler-exchange-secmod-eddsa.h \ - secmod_common.c secmod_common.h + taler-exchange-secmod-eddsa.c taler-exchange-secmod-eddsa.h taler_exchange_secmod_eddsa_LDADD = \ libtalerutil.la \ -lgnunetutil \ @@ -107,6 +102,10 @@ libtalerutil_la_SOURCES = \ mhd.c \ offline_signatures.c \ payto.c \ + secmod_common.c secmod_common.h \ + secmod_cs.c \ + secmod_eddsa.c \ + secmod_rsa.c \ secmod_signatures.c \ taler_error_codes.c \ tokens.c \ diff --git a/src/util/secmod_cs.c b/src/util/secmod_cs.c new file mode 100644 index 000000000..54a5789e6 --- /dev/null +++ b/src/util/secmod_cs.c @@ -0,0 +1,2252 @@ +/* + This file is part of TALER + Copyright (C) 2014-2024 Taler Systems SA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file util/secmod_cs.c + * @brief Standalone process to perform private key CS operations + * @author Christian Grothoff + * + * Key design points: + * - EVERY thread of the exchange will have its own pair of connections to the + * crypto helpers. This way, every thread will also have its own /keys state + * and avoid the need to synchronize on those. + * - auditor signatures and master signatures are to be kept in the exchange DB, + * and merged with the public keys of the helper by the exchange HTTPD! + * - the main loop of the helper is SINGLE-THREADED, but there are + * threads for crypto-workers which do the signing in parallel, one per client. + * - thread-safety: signing happens in parallel, thus when REMOVING private keys, + * we must ensure that all signers are done before we fully free() the + * private key. This is done by reference counting (as work is always + * assigned and collected by the main thread). + */ +#include "platform.h" +#include "taler_util.h" +#include "taler-exchange-secmod-cs.h" +#include <gcrypt.h> +#include <pthread.h> +#include <sys/eventfd.h> +#include "taler_error_codes.h" +#include "taler_signatures.h" +#include "secmod_common.h" +#include <poll.h> + + +/** + * Information we keep per denomination. + */ +struct Denomination; + + +/** + * One particular denomination key. + */ +struct DenominationKey +{ + + /** + * Kept in a DLL of the respective denomination. Sorted by anchor time. + */ + struct DenominationKey *next; + + /** + * Kept in a DLL of the respective denomination. Sorted by anchor time. + */ + struct DenominationKey *prev; + + /** + * Denomination this key belongs to. + */ + struct Denomination *denom; + + /** + * Name of the file this key is stored under. + */ + char *filename; + + /** + * The private key of the denomination. + */ + struct GNUNET_CRYPTO_CsPrivateKey denom_priv; + + /** + * The public key of the denomination. + */ + struct GNUNET_CRYPTO_CsPublicKey denom_pub; + + /** + * Message to transmit to clients to introduce this public key. + */ + struct TALER_CRYPTO_CsKeyAvailableNotification *an; + + /** + * Hash of this denomination's public key. + */ + struct TALER_CsPubHashP h_cs; + + /** + * Time at which this key is supposed to become valid. + */ + struct GNUNET_TIME_Timestamp anchor; + + /** + * Generation when this key was created or revoked. + */ + uint64_t key_gen; + + /** + * Reference counter. Counts the number of threads that are + * using this key at this time. + */ + unsigned int rc; + + /** + * Flag set to true if this key has been purged and the memory + * must be freed as soon as @e rc hits zero. + */ + bool purge; + +}; + + +struct Denomination +{ + + /** + * Kept in a DLL. Sorted by #denomination_action_time(). + */ + struct Denomination *next; + + /** + * Kept in a DLL. Sorted by #denomination_action_time(). + */ + struct Denomination *prev; + + /** + * Head of DLL of actual keys of this denomination. + */ + struct DenominationKey *keys_head; + + /** + * Tail of DLL of actual keys of this denomination. + */ + struct DenominationKey *keys_tail; + + /** + * How long can coins be withdrawn (generated)? Should be small + * enough to limit how many coins will be signed into existence with + * the same key, but large enough to still provide a reasonable + * anonymity set. + */ + struct GNUNET_TIME_Relative duration_withdraw; + + /** + * What is the configuration section of this denomination type? Also used + * for the directory name where the denomination keys are stored. + */ + char *section; + +}; + + +/** + * A semaphore. + */ +struct Semaphore +{ + /** + * Mutex for the semaphore. + */ + pthread_mutex_t mutex; + + /** + * Condition variable for the semaphore. + */ + pthread_cond_t cv; + + /** + * Counter of the semaphore. + */ + unsigned int ctr; +}; + + +/** + * Job in a batch sign request. + */ +struct BatchJob; + +/** + * Handle for a thread that does work in batch signing. + */ +struct Worker +{ + /** + * Kept in a DLL. + */ + struct Worker *prev; + + /** + * Kept in a DLL. + */ + struct Worker *next; + + /** + * Job this worker should do next. + */ + struct BatchJob *job; + + /** + * Semaphore to signal the worker that a job is available. + */ + struct Semaphore sem; + + /** + * Handle for this thread. + */ + pthread_t pt; + + /** + * Set to true if the worker should terminate. + */ + bool do_shutdown; +}; + + +/** + * Job in a batch sign request. + */ +struct BatchJob +{ + + /** + * Thread doing the work. + */ + struct Worker *worker; + + /** + * Semaphore to signal that the job is finished. + */ + struct Semaphore sem; + + /** + * Computation status. + */ + enum TALER_ErrorCode ec; + + /** + * Which type of request is this? + */ + enum { TYPE_SIGN, TYPE_RDERIVE } type; + + /** + * Details depending on @e type. + */ + union + { + + /** + * Details if @e type is TYPE_SIGN. + */ + struct + { + /** + * Request we are working on. + */ + const struct TALER_CRYPTO_CsSignRequestMessage *sr; + + /** + * Result with the signature. + */ + struct GNUNET_CRYPTO_CsBlindSignature cs_answer; + } sign; + + /** + * Details if type is TYPE_RDERIVE. + */ + struct + { + /** + * Request we are answering. + */ + const struct TALER_CRYPTO_CsRDeriveRequest *rdr; + + /** + * Pair of points to return. + */ + struct GNUNET_CRYPTO_CSPublicRPairP rpairp; + + } rderive; + + } details; + +}; + +/** + * Head of DLL of workers ready for more work. + */ +static struct Worker *worker_head; + +/** + * Tail of DLL of workers ready for more work. + */ +static struct Worker *worker_tail; + +/** + * Lock for manipulating the worker DLL. + */ +static pthread_mutex_t worker_lock; + +/** + * Total number of workers that were started. + */ +static unsigned int workers; + +/** + * Semaphore used to grab a worker. + */ +static struct Semaphore worker_sem; + +/** + * Command-line options for various TALER_SECMOD_XXX_run() functions. + */ +static struct TALER_SECMOD_Options *globals; + +/** + * Where do we store the keys? + */ +static char *keydir; + +/** + * How much should coin creation (@e duration_withdraw) duration overlap + * with the next denomination? Basically, the starting time of two + * denominations is always @e duration_withdraw - #overlap_duration apart. + */ +static struct GNUNET_TIME_Relative overlap_duration; + +/** + * How long into the future do we pre-generate keys? + */ +static struct GNUNET_TIME_Relative lookahead_sign; + +/** + * All of our denominations, in a DLL. Sorted? + */ +static struct Denomination *denom_head; + +/** + * All of our denominations, in a DLL. Sorted? + */ +static struct Denomination *denom_tail; + +/** + * Map of hashes of public (CS) keys to `struct DenominationKey *` + * with the respective private keys. + */ +static struct GNUNET_CONTAINER_MultiHashMap *keys; + +/** + * Task run to generate new keys. + */ +static struct GNUNET_SCHEDULER_Task *keygen_task; + +/** + * Lock for the keys queue. + */ +static pthread_mutex_t keys_lock; + +/** + * Current key generation. + */ +static uint64_t key_gen; + +/** + * Generate the announcement message for @a dk. + * + * @param[in,out] dk denomination key to generate the announcement for + */ +static void +generate_response (struct DenominationKey *dk) +{ + struct Denomination *denom = dk->denom; + size_t nlen = strlen (denom->section) + 1; + struct TALER_CRYPTO_CsKeyAvailableNotification *an; + void *p; + size_t tlen; + + GNUNET_assert (sizeof(dk->denom_pub) < UINT16_MAX); + GNUNET_assert (nlen < UINT16_MAX); + tlen = nlen + sizeof (*an); + GNUNET_assert (tlen < UINT16_MAX); + an = GNUNET_malloc (tlen); + an->header.size = htons ((uint16_t) tlen); + an->header.type = htons (TALER_HELPER_CS_MT_AVAIL); + an->section_name_len = htons ((uint16_t) nlen); + an->anchor_time = GNUNET_TIME_timestamp_hton (dk->anchor); + an->duration_withdraw = GNUNET_TIME_relative_hton (denom->duration_withdraw); + an->denom_pub = dk->denom_pub; + TALER_exchange_secmod_cs_sign (&dk->h_cs, + denom->section, + dk->anchor, + denom->duration_withdraw, + &TES_smpriv, + &an->secm_sig); + an->secm_pub = TES_smpub; + p = (void *) &an[1]; + GNUNET_memcpy (p, + denom->section, + nlen); + dk->an = an; +} + + +/** + * Do the actual signing work. + * + * @param h_cs hash of key to sign with + * @param planchet message to sign + * @param for_melt true if for melting + * @param[out] cs_sigp set to the CS signature + * @return #TALER_EC_NONE on success + */ +static enum TALER_ErrorCode +do_sign (const struct TALER_CsPubHashP *h_cs, + const struct GNUNET_CRYPTO_CsBlindedMessage *planchet, + bool for_melt, + struct GNUNET_CRYPTO_CsBlindSignature *cs_sigp) +{ + struct GNUNET_CRYPTO_CsRSecret r[2]; + struct DenominationKey *dk; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + dk = GNUNET_CONTAINER_multihashmap_get (keys, + &h_cs->hash); + if (NULL == dk) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Signing request failed, denomination key %s unknown\n", + GNUNET_h2s (&h_cs->hash)); + return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; + } + if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Signing request failed, denomination key %s is not yet valid\n", + GNUNET_h2s (&h_cs->hash)); + return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Received request to sign over bytes with key %s\n", + GNUNET_h2s (&h_cs->hash)); + GNUNET_assert (dk->rc < UINT_MAX); + dk->rc++; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_CRYPTO_cs_r_derive (&planchet->nonce, + for_melt ? "rm" : "rw", + &dk->denom_priv, + r); + GNUNET_CRYPTO_cs_sign_derive (&dk->denom_priv, + r, + planchet, + cs_sigp); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_assert (dk->rc > 0); + dk->rc--; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return TALER_EC_NONE; +} + + +/** + * Generate error response that signing failed. + * + * @param client client to send response to + * @param ec error code to include + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +fail_sign (struct TES_Client *client, + enum TALER_ErrorCode ec) +{ + struct TALER_CRYPTO_SignFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_CS_MT_RES_SIGN_FAILURE), + .ec = htonl (ec) + }; + + return TES_transmit (client->csock, + &sf.header); +} + + +/** + * Generate error response that deriving failed. + * + * @param client client to send response to + * @param ec error code to include + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +fail_derive (struct TES_Client *client, + enum TALER_ErrorCode ec) +{ + struct TALER_CRYPTO_RDeriveFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE_FAILURE), + .ec = htonl (ec) + }; + + return TES_transmit (client->csock, + &sf.header); +} + + +/** + * Generate signature response. + * + * @param client client to send response to + * @param cs_answer signature to send + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +send_signature (struct TES_Client *client, + const struct GNUNET_CRYPTO_CsBlindSignature *cs_answer) +{ + struct TALER_CRYPTO_SignResponse sres; + + sres.header.size = htons (sizeof (sres)); + sres.header.type = htons (TALER_HELPER_CS_MT_RES_SIGNATURE); + sres.b = htonl (cs_answer->b); + sres.cs_answer = cs_answer->s_scalar; + return TES_transmit (client->csock, + &sres.header); +} + + +/** + * Handle @a client request @a sr to create signature. Create the + * signature using the respective key and return the result to + * the client. + * + * @param client the client making the request + * @param sr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_sign_request (struct TES_Client *client, + const struct TALER_CRYPTO_CsSignRequestMessage *sr) +{ + struct GNUNET_CRYPTO_CsBlindSignature cs_answer; + struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); + enum TALER_ErrorCode ec; + enum GNUNET_GenericReturnValue ret; + + ec = do_sign (&sr->h_cs, + &sr->message, + (0 != ntohl (sr->for_melt)), + &cs_answer); + if (TALER_EC_NONE != ec) + { + return fail_sign (client, + ec); + } + ret = send_signature (client, + &cs_answer); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Sent CS signature after %s\n", + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_duration (now), + GNUNET_YES)); + return ret; +} + + +/** + * Do the actual deriving work. + * + * @param h_cs key to sign with + * @param nonce nonce to derive from + * @param for_melt true if for melting + * @param[out] rpairp set to the derived values + * @return #TALER_EC_NONE on success + */ +static enum TALER_ErrorCode +do_derive (const struct TALER_CsPubHashP *h_cs, + const struct GNUNET_CRYPTO_CsSessionNonce *nonce, + bool for_melt, + struct GNUNET_CRYPTO_CSPublicRPairP *rpairp) +{ + struct DenominationKey *dk; + struct GNUNET_CRYPTO_CSPrivateRPairP r_priv; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + dk = GNUNET_CONTAINER_multihashmap_get (keys, + &h_cs->hash); + if (NULL == dk) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "R Derive request failed, denomination key %s unknown\n", + GNUNET_h2s (&h_cs->hash)); + return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; + } + if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "R Derive request failed, denomination key %s is not yet valid\n", + GNUNET_h2s (&h_cs->hash)); + return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Received request to derive R with key %s\n", + GNUNET_h2s (&h_cs->hash)); + GNUNET_assert (dk->rc < UINT_MAX); + dk->rc++; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_CRYPTO_cs_r_derive (nonce, + for_melt ? "rm" : "rw", + &dk->denom_priv, + r_priv.r); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_assert (dk->rc > 0); + dk->rc--; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[0], + &rpairp->r_pub[0]); + GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[1], + &rpairp->r_pub[1]); + return TALER_EC_NONE; +} + + +/** + * Generate derivation response. + * + * @param client client to send response to + * @param r_pub public point value pair to send + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +send_derivation (struct TES_Client *client, + const struct GNUNET_CRYPTO_CSPublicRPairP *r_pub) +{ + struct TALER_CRYPTO_RDeriveResponse rdr = { + .header.size = htons (sizeof (rdr)), + .header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE), + .r_pub = *r_pub + }; + + return TES_transmit (client->csock, + &rdr.header); +} + + +/** + * Initialize a semaphore @a sem with a value of @a val. + * + * @param[out] sem semaphore to initialize + * @param val initial value of the semaphore + */ +static void +sem_init (struct Semaphore *sem, + unsigned int val) +{ + GNUNET_assert (0 == + pthread_mutex_init (&sem->mutex, + NULL)); + GNUNET_assert (0 == + pthread_cond_init (&sem->cv, + NULL)); + sem->ctr = val; +} + + +/** + * Decrement semaphore, blocks until this is possible. + * + * @param[in,out] sem semaphore to decrement + */ +static void +sem_down (struct Semaphore *sem) +{ + GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); + while (0 == sem->ctr) + { + pthread_cond_wait (&sem->cv, + &sem->mutex); + } + sem->ctr--; + GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); +} + + +/** + * Increment semaphore, blocks until this is possible. + * + * @param[in,out] sem semaphore to decrement + */ +static void +sem_up (struct Semaphore *sem) +{ + GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); + sem->ctr++; + GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); + pthread_cond_signal (&sem->cv); +} + + +/** + * Release resources used by @a sem. + * + * @param[in] sem semaphore to release (except the memory itself) + */ +static void +sem_done (struct Semaphore *sem) +{ + GNUNET_break (0 == pthread_cond_destroy (&sem->cv)); + GNUNET_break (0 == pthread_mutex_destroy (&sem->mutex)); +} + + +/** + * Main logic of a worker thread. Grabs work, does it, + * grabs more work. + * + * @param cls a `struct Worker *` + * @returns cls + */ +static void * +worker (void *cls) +{ + struct Worker *w = cls; + + while (true) + { + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + GNUNET_CONTAINER_DLL_insert (worker_head, + worker_tail, + w); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + sem_up (&worker_sem); + sem_down (&w->sem); + if (w->do_shutdown) + break; + { + struct BatchJob *bj = w->job; + + switch (bj->type) + { + case TYPE_SIGN: + { + const struct TALER_CRYPTO_CsSignRequestMessage *sr + = bj->details.sign.sr; + + bj->ec = do_sign (&sr->h_cs, + &sr->message, + (0 != ntohl (sr->for_melt)), + &bj->details.sign.cs_answer); + break; + } + case TYPE_RDERIVE: + { + const struct TALER_CRYPTO_CsRDeriveRequest *rdr + = bj->details.rderive.rdr; + bj->ec = do_derive (&rdr->h_cs, + &rdr->nonce, + (0 != ntohl (rdr->for_melt)), + &bj->details.rderive.rpairp); + break; + } + } + sem_up (&bj->sem); + w->job = NULL; + } + } + return w; +} + + +/** + * Start batch job @a bj to sign @a sr. + * + * @param sr signature request to answer + * @param[out] bj job data structure + */ +static void +start_sign_job (const struct TALER_CRYPTO_CsSignRequestMessage *sr, + struct BatchJob *bj) +{ + sem_init (&bj->sem, + 0); + bj->type = TYPE_SIGN; + bj->details.sign.sr = sr; + sem_down (&worker_sem); + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + bj->worker = worker_head; + GNUNET_CONTAINER_DLL_remove (worker_head, + worker_tail, + bj->worker); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + bj->worker->job = bj; + sem_up (&bj->worker->sem); +} + + +/** + * Start batch job @a bj to derive @a rdr. + * + * @param rdr derivation request to answer + * @param[out] bj job data structure + */ +static void +start_derive_job (const struct TALER_CRYPTO_CsRDeriveRequest *rdr, + struct BatchJob *bj) +{ + sem_init (&bj->sem, + 0); + bj->type = TYPE_RDERIVE; + bj->details.rderive.rdr = rdr; + sem_down (&worker_sem); + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + bj->worker = worker_head; + GNUNET_CONTAINER_DLL_remove (worker_head, + worker_tail, + bj->worker); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + bj->worker->job = bj; + sem_up (&bj->worker->sem); +} + + +/** + * Finish a job @a bj for a @a client. + * + * @param client who made the request + * @param[in,out] bj job to finish + */ +static void +finish_job (struct TES_Client *client, + struct BatchJob *bj) +{ + sem_down (&bj->sem); + sem_done (&bj->sem); + switch (bj->type) + { + case TYPE_SIGN: + if (TALER_EC_NONE != bj->ec) + { + fail_sign (client, + bj->ec); + return; + } + send_signature (client, + &bj->details.sign.cs_answer); + break; + case TYPE_RDERIVE: + if (TALER_EC_NONE != bj->ec) + { + fail_derive (client, + bj->ec); + return; + } + send_derivation (client, + &bj->details.rderive.rpairp); + break; + } +} + + +/** + * Handle @a client request @a sr to create a batch of signature. Creates the + * signatures using the respective key and return the results to the client. + * + * @param client the client making the request + * @param bsr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_batch_sign_request (struct TES_Client *client, + const struct TALER_CRYPTO_BatchSignRequest *bsr) +{ + uint32_t bs = ntohl (bsr->batch_size); + uint16_t size = ntohs (bsr->header.size) - sizeof (*bsr); + const void *off = (const void *) &bsr[1]; + unsigned int idx = 0; + struct BatchJob jobs[GNUNET_NZL (bs)]; + bool failure = false; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Handling batch sign request of size %u\n", + (unsigned int) bs); + if (bs > TALER_MAX_FRESH_COINS) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + while ( (bs > 0) && + (size >= sizeof (struct TALER_CRYPTO_CsSignRequestMessage)) ) + { + const struct TALER_CRYPTO_CsSignRequestMessage *sr = off; + uint16_t s = ntohs (sr->header.size); + + if (s > size) + { + failure = true; + bs = idx; + break; + } + start_sign_job (sr, + &jobs[idx++]); + off += s; + size -= s; + } + GNUNET_break_op (0 == size); + bs = GNUNET_MIN (bs, + idx); + for (unsigned int i = 0; i<bs; i++) + finish_job (client, + &jobs[i]); + if (failure) + { + struct TALER_CRYPTO_SignFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_CS_MT_RES_BATCH_SIGN_FAILURE), + .ec = htonl (TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE) + }; + + GNUNET_break (0); + return TES_transmit (client->csock, + &sf.header); + } + return GNUNET_OK; +} + + +/** + * Handle @a client request @a sr to create a batch of derivations. Creates the + * derivations using the respective key and return the results to the client. + * + * @param client the client making the request + * @param bdr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_batch_derive_request (struct TES_Client *client, + const struct TALER_CRYPTO_BatchDeriveRequest *bdr) +{ + uint32_t bs = ntohl (bdr->batch_size); + uint16_t size = ntohs (bdr->header.size) - sizeof (*bdr); + const void *off = (const void *) &bdr[1]; + unsigned int idx = 0; + struct BatchJob jobs[bs]; + bool failure = false; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Handling batch derivation request of size %u\n", + (unsigned int) bs); + if (bs > TALER_MAX_FRESH_COINS) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + while ( (bs > 0) && + (size >= sizeof (struct TALER_CRYPTO_CsRDeriveRequest)) ) + { + const struct TALER_CRYPTO_CsRDeriveRequest *rdr = off; + uint16_t s = ntohs (rdr->header.size); + + if ( (s > size) || + (s != sizeof (*rdr)) ) + { + failure = true; + bs = idx; + break; + } + start_derive_job (rdr, + &jobs[idx++]); + off += s; + size -= s; + } + GNUNET_break_op (0 == size); + bs = GNUNET_MIN (bs, + idx); + for (unsigned int i = 0; i<bs; i++) + finish_job (client, + &jobs[i]); + if (failure) + { + GNUNET_break (0); + return fail_derive (client, + TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE); + } + return GNUNET_OK; +} + + +/** + * Start worker thread for batch processing. + * + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +start_worker (void) +{ + struct Worker *w; + + w = GNUNET_new (struct Worker); + sem_init (&w->sem, + 0); + if (0 != pthread_create (&w->pt, + NULL, + &worker, + w)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "pthread_create"); + GNUNET_free (w); + return GNUNET_SYSERR; + } + workers++; + return GNUNET_OK; +} + + +/** + * Stop all worker threads. + */ +static void +stop_workers (void) +{ + while (workers > 0) + { + struct Worker *w; + void *result; + + sem_down (&worker_sem); + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + w = worker_head; + GNUNET_CONTAINER_DLL_remove (worker_head, + worker_tail, + w); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + w->do_shutdown = true; + sem_up (&w->sem); + pthread_join (w->pt, + &result); + GNUNET_assert (result == w); + sem_done (&w->sem); + GNUNET_free (w); + workers--; + } +} + + +/** + * Initialize key material for denomination key @a dk (also on disk). + * + * @param[in,out] dk denomination key to compute key material for + * @param position where in the DLL will the @a dk go + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +setup_key (struct DenominationKey *dk, + struct DenominationKey *position) +{ + struct Denomination *denom = dk->denom; + struct GNUNET_CRYPTO_CsPrivateKey priv; + struct GNUNET_CRYPTO_CsPublicKey pub; + + GNUNET_CRYPTO_cs_private_key_generate (&priv); + GNUNET_CRYPTO_cs_private_key_get_public (&priv, + &pub); + GNUNET_CRYPTO_hash (&pub, + sizeof (pub), + &dk->h_cs.hash); + GNUNET_asprintf (&dk->filename, + "%s/%s/%llu", + keydir, + denom->section, + (unsigned long long) (dk->anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us + )); + if (GNUNET_OK != + GNUNET_DISK_fn_write (dk->filename, + &priv, + sizeof(priv), + GNUNET_DISK_PERM_USER_READ)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "write", + dk->filename); + return GNUNET_SYSERR; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Setup fresh private key %s at %s in `%s' (generation #%llu)\n", + GNUNET_h2s (&dk->h_cs.hash), + GNUNET_TIME_timestamp2s (dk->anchor), + dk->filename, + (unsigned long long) key_gen); + dk->denom_priv = priv; + dk->denom_pub = pub; + dk->key_gen = key_gen; + generate_response (dk); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put ( + keys, + &dk->h_cs.hash, + dk, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Duplicate private key created! Terminating.\n"); + GNUNET_free (dk->filename); + GNUNET_free (dk->an); + GNUNET_free (dk); + return GNUNET_SYSERR; + } + GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, + denom->keys_tail, + position, + dk); + return GNUNET_OK; +} + + +/** + * The withdraw period of a key @a dk has expired. Purge it. + * + * @param[in] dk expired denomination key to purge + */ +static void +purge_key (struct DenominationKey *dk) +{ + if (dk->purge) + return; + if (0 != unlink (dk->filename)) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + dk->filename); + GNUNET_free (dk->filename); + dk->purge = true; + dk->key_gen = key_gen; +} + + +/** + * A @a client informs us that a key has been revoked. + * Check if the key is still in use, and if so replace (!) + * it with a fresh key. + * + * @param client the client making the request + * @param rr the revocation request + */ +static enum GNUNET_GenericReturnValue +handle_revoke_request (struct TES_Client *client, + const struct TALER_CRYPTO_CsRevokeRequest *rr) +{ + struct DenominationKey *dk; + struct DenominationKey *ndk; + struct Denomination *denom; + + (void) client; + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + dk = GNUNET_CONTAINER_multihashmap_get (keys, + &rr->h_cs.hash); + if (NULL == dk) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, denomination key %s unknown\n", + GNUNET_h2s (&rr->h_cs.hash)); + return GNUNET_OK; + } + if (dk->purge) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, denomination key %s already revoked\n", + GNUNET_h2s (&rr->h_cs.hash)); + return GNUNET_OK; + } + + key_gen++; + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Revoking key %s, bumping generation to %llu\n", + GNUNET_h2s (&rr->h_cs.hash), + (unsigned long long) key_gen); + purge_key (dk); + + /* Setup replacement key */ + denom = dk->denom; + ndk = GNUNET_new (struct DenominationKey); + ndk->denom = denom; + ndk->anchor = dk->anchor; + if (GNUNET_OK != + setup_key (ndk, + dk)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_break (0); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + TES_wake_clients (); + return GNUNET_OK; +} + + +/** + * Handle @a client request @a rdr to create signature. Create the + * signature using the respective key and return the result to + * the client. + * + * @param client the client making the request + * @param rdr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_r_derive_request (struct TES_Client *client, + const struct TALER_CRYPTO_CsRDeriveRequest *rdr) +{ + struct GNUNET_CRYPTO_CSPublicRPairP r_pub; + struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); + enum TALER_ErrorCode ec; + enum GNUNET_GenericReturnValue ret; + + ec = do_derive (&rdr->h_cs, + &rdr->nonce, + (0 != ntohl (rdr->for_melt)), + &r_pub); + if (TALER_EC_NONE != ec) + { + return fail_derive (client, + ec); + } + + ret = send_derivation (client, + &r_pub); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Sent CS Derived R after %s\n", + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_duration (now), + GNUNET_YES)); + return ret; +} + + +/** + * Handle @a hdr message received from @a client. + * + * @param client the client that received the message + * @param hdr message that was received + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +cs_work_dispatch (struct TES_Client *client, + const struct GNUNET_MessageHeader *hdr) +{ + uint16_t msize = ntohs (hdr->size); + + switch (ntohs (hdr->type)) + { + case TALER_HELPER_CS_MT_REQ_SIGN: + if (msize < sizeof (struct TALER_CRYPTO_CsSignRequestMessage)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_sign_request ( + client, + (const struct TALER_CRYPTO_CsSignRequestMessage *) hdr); + case TALER_HELPER_CS_MT_REQ_REVOKE: + if (msize != sizeof (struct TALER_CRYPTO_CsRevokeRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_revoke_request ( + client, + (const struct TALER_CRYPTO_CsRevokeRequest *) hdr); + case TALER_HELPER_CS_MT_REQ_BATCH_SIGN: + if (msize <= sizeof (struct TALER_CRYPTO_BatchSignRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_batch_sign_request ( + client, + (const struct TALER_CRYPTO_BatchSignRequest *) hdr); + case TALER_HELPER_CS_MT_REQ_BATCH_RDERIVE: + if (msize <= sizeof (struct TALER_CRYPTO_BatchDeriveRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_batch_derive_request ( + client, + (const struct TALER_CRYPTO_BatchDeriveRequest *) hdr); + case TALER_HELPER_CS_MT_REQ_RDERIVE: + if (msize != sizeof (struct TALER_CRYPTO_CsRDeriveRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_r_derive_request (client, + (const struct + TALER_CRYPTO_CsRDeriveRequest *) hdr); + default: + GNUNET_break_op (0); + return GNUNET_SYSERR; + } +} + + +/** + * Send our initial key set to @a client together with the + * "sync" terminator. + * + * @param client the client to inform + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +cs_client_init (struct TES_Client *client) +{ + size_t obs = 0; + char *buf; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Initializing new client %p\n", + client); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *dk = denom->keys_head; + NULL != dk; + dk = dk->next) + { + obs += ntohs (dk->an->header.size); + } + } + buf = GNUNET_malloc (obs); + obs = 0; + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *dk = denom->keys_head; + NULL != dk; + dk = dk->next) + { + GNUNET_memcpy (&buf[obs], + dk->an, + ntohs (dk->an->header.size)); + obs += ntohs (dk->an->header.size); + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (GNUNET_OK != + TES_transmit_raw (client->csock, + obs, + buf)) + { + GNUNET_free (buf); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Client %p must have disconnected\n", + client); + return GNUNET_SYSERR; + } + GNUNET_free (buf); + { + struct GNUNET_MessageHeader synced = { + .type = htons (TALER_HELPER_CS_SYNCED), + .size = htons (sizeof (synced)) + }; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Sending CS SYNCED message to %p\n", + client); + if (GNUNET_OK != + TES_transmit (client->csock, + &synced)) + { + GNUNET_break (0); + return GNUNET_SYSERR; + } + } + return GNUNET_OK; +} + + +/** + * Notify @a client about all changes to the keys since + * the last generation known to the @a client. + * + * @param client the client to notify + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +cs_update_client_keys (struct TES_Client *client) +{ + size_t obs = 0; + char *buf; + enum GNUNET_GenericReturnValue ret; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *key = denom->keys_head; + NULL != key; + key = key->next) + { + if (key->key_gen <= client->key_gen) + continue; + if (key->purge) + obs += sizeof (struct TALER_CRYPTO_CsKeyPurgeNotification); + else + obs += ntohs (key->an->header.size); + } + } + if (0 == obs) + { + /* nothing to do */ + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return GNUNET_OK; + } + buf = GNUNET_malloc (obs); + obs = 0; + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *key = denom->keys_head; + NULL != key; + key = key->next) + { + if (key->key_gen <= client->key_gen) + continue; + if (key->purge) + { + struct TALER_CRYPTO_CsKeyPurgeNotification pn = { + .header.type = htons (TALER_HELPER_CS_MT_PURGE), + .header.size = htons (sizeof (pn)), + .h_cs = key->h_cs + }; + + GNUNET_memcpy (&buf[obs], + &pn, + sizeof (pn)); + GNUNET_assert (obs + sizeof (pn) + > obs); + obs += sizeof (pn); + } + else + { + GNUNET_memcpy (&buf[obs], + key->an, + ntohs (key->an->header.size)); + GNUNET_assert (obs + ntohs (key->an->header.size) + > obs); + obs += ntohs (key->an->header.size); + } + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + ret = TES_transmit_raw (client->csock, + obs, + buf); + GNUNET_free (buf); + return ret; +} + + +/** + * Create a new denomination key (we do not have enough). + * + * @param denom denomination key to create + * @param now current time to use (to get many keys to use the exact same time) + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +create_key (struct Denomination *denom, + struct GNUNET_TIME_Timestamp now) +{ + struct DenominationKey *dk; + struct GNUNET_TIME_Timestamp anchor; + + anchor = now; + if (NULL != denom->keys_tail) + { + struct GNUNET_TIME_Absolute abs; + + abs = GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, + GNUNET_TIME_relative_subtract ( + denom->duration_withdraw, + overlap_duration)); + if (GNUNET_TIME_absolute_cmp (now.abs_time, <, abs)) + anchor = GNUNET_TIME_absolute_to_timestamp (abs); + } + dk = GNUNET_new (struct DenominationKey); + dk->denom = denom; + dk->anchor = anchor; + if (GNUNET_OK != + setup_key (dk, + denom->keys_tail)) + { + GNUNET_break (0); + GNUNET_free (dk); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * At what time does this denomination require its next action? + * Basically, the minimum of the withdraw expiration time of the + * oldest denomination key, and the withdraw expiration time of + * the newest denomination key minus the #lookahead_sign time. + * + * @param denom denomination to compute action time for + */ +static struct GNUNET_TIME_Absolute +denomination_action_time (const struct Denomination *denom) +{ + struct DenominationKey *head = denom->keys_head; + struct DenominationKey *tail = denom->keys_tail; + struct GNUNET_TIME_Absolute tt; + + if (NULL == head) + return GNUNET_TIME_UNIT_ZERO_ABS; + tt = GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (tail->anchor.abs_time, + denom->duration_withdraw), + lookahead_sign), + overlap_duration); + if (head->rc > 0) + return tt; /* head expiration does not count due to rc > 0 */ + return GNUNET_TIME_absolute_min ( + GNUNET_TIME_absolute_add (head->anchor.abs_time, + denom->duration_withdraw), + tt); +} + + +/** + * Create new keys and expire ancient keys of the given denomination @a denom. + * Removes the @a denom from the #denom_head DLL and re-insert its at the + * correct location sorted by next maintenance activity. + * + * @param[in,out] denom denomination to update material for + * @param now current time to use (to get many keys to use the exact same time) + * @param[in,out] wake set to true if we should wake the clients + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +update_keys (struct Denomination *denom, + struct GNUNET_TIME_Timestamp now, + bool *wake) +{ + /* create new denomination keys */ + if (NULL != denom->keys_tail) + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Updating keys of denomination `%s', last key %s valid for another %s\n", + denom->section, + GNUNET_h2s (&denom->keys_tail->h_cs.hash), + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_remaining ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add ( + denom->keys_tail->anchor.abs_time, + denom->duration_withdraw), + overlap_duration)), + GNUNET_YES)); + while ( (NULL == denom->keys_tail) || + GNUNET_TIME_absolute_is_past ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, + denom->duration_withdraw), + lookahead_sign), + overlap_duration)) ) + { + if (! *wake) + { + key_gen++; + *wake = true; + } + if (GNUNET_OK != + create_key (denom, + now)) + { + GNUNET_break (0); + globals->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return GNUNET_SYSERR; + } + } + /* remove expired denomination keys */ + while ( (NULL != denom->keys_head) && + GNUNET_TIME_absolute_is_past + (GNUNET_TIME_absolute_add (denom->keys_head->anchor.abs_time, + denom->duration_withdraw)) ) + { + struct DenominationKey *key = denom->keys_head; + struct DenominationKey *nxt = key->next; + + if (0 != key->rc) + break; /* later */ + GNUNET_CONTAINER_DLL_remove (denom->keys_head, + denom->keys_tail, + key); + GNUNET_assert (GNUNET_OK == + GNUNET_CONTAINER_multihashmap_remove ( + keys, + &key->h_cs.hash, + key)); + if ( (! key->purge) && + (0 != unlink (key->filename)) ) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + key->filename); + GNUNET_free (key->filename); + GNUNET_free (key->an); + GNUNET_free (key); + key = nxt; + } + + /* Update position of 'denom' in #denom_head DLL: sort by action time */ + { + struct Denomination *before; + struct GNUNET_TIME_Absolute at; + + at = denomination_action_time (denom); + GNUNET_CONTAINER_DLL_remove (denom_head, + denom_tail, + denom); + before = NULL; + for (struct Denomination *pos = denom_head; + NULL != pos; + pos = pos->next) + { + if (GNUNET_TIME_absolute_cmp (denomination_action_time (pos), >=, at)) + break; + before = pos; + } + GNUNET_CONTAINER_DLL_insert_after (denom_head, + denom_tail, + before, + denom); + } + return GNUNET_OK; +} + + +/** + * Task run periodically to expire keys and/or generate fresh ones. + * + * @param cls NULL + */ +static void +update_denominations (void *cls) +{ + struct Denomination *denom; + struct GNUNET_TIME_Absolute now; + struct GNUNET_TIME_Timestamp t; + bool wake = false; + + (void) cls; + keygen_task = NULL; + now = GNUNET_TIME_absolute_get (); + t = GNUNET_TIME_absolute_to_timestamp (now); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Updating denominations ...\n"); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + do { + denom = denom_head; + if (GNUNET_OK != + update_keys (denom, + t, + &wake)) + return; + } while (denom != denom_head); + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Updating denominations finished ...\n"); + if (wake) + TES_wake_clients (); + keygen_task = GNUNET_SCHEDULER_add_at (denomination_action_time (denom), + &update_denominations, + NULL); +} + + +/** + * Parse private key of denomination @a denom in @a buf. + * + * @param[out] denom denomination of the key + * @param filename name of the file we are parsing, for logging + * @param priv key material + */ +static void +parse_key (struct Denomination *denom, + const char *filename, + const struct GNUNET_CRYPTO_CsPrivateKey *priv) +{ + char *anchor_s; + char dummy; + unsigned long long anchor_ll; + struct GNUNET_TIME_Timestamp anchor; + + anchor_s = strrchr (filename, + '/'); + if (NULL == anchor_s) + { + /* File in a directory without '/' in the name, this makes no sense. */ + GNUNET_break (0); + return; + } + anchor_s++; + if (1 != sscanf (anchor_s, + "%llu%c", + &anchor_ll, + &dummy)) + { + /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return; + } + anchor.abs_time.abs_value_us + = anchor_ll * GNUNET_TIME_UNIT_SECONDS.rel_value_us; + if (anchor_ll != anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us) + { + /* Integer overflow. Bad, invalid filename. */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return; + } + { + struct DenominationKey *dk; + struct DenominationKey *before; + + dk = GNUNET_new (struct DenominationKey); + dk->denom_priv = *priv; + dk->denom = denom; + dk->anchor = anchor; + dk->filename = GNUNET_strdup (filename); + GNUNET_CRYPTO_cs_private_key_get_public (priv, + &dk->denom_pub); + GNUNET_CRYPTO_hash (&dk->denom_pub, + sizeof (dk->denom_pub), + &dk->h_cs.hash); + generate_response (dk); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put ( + keys, + &dk->h_cs.hash, + dk, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Duplicate private key %s detected in file `%s'. Skipping.\n", + GNUNET_h2s (&dk->h_cs.hash), + filename); + GNUNET_free (dk->an); + GNUNET_free (dk); + return; + } + before = NULL; + for (struct DenominationKey *pos = denom->keys_head; + NULL != pos; + pos = pos->next) + { + if (GNUNET_TIME_timestamp_cmp (pos->anchor, + >, + anchor)) + break; + before = pos; + } + GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, + denom->keys_tail, + before, + dk); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Imported key %s from `%s'\n", + GNUNET_h2s (&dk->h_cs.hash), + filename); + } +} + + +/** + * Import a private key from @a filename for the denomination + * given in @a cls. + * + * @param[in,out] cls a `struct Denomiantion` + * @param filename name of a file in the directory + * @return #GNUNET_OK (always, continue to iterate) + */ +static enum GNUNET_GenericReturnValue +import_key (void *cls, + const char *filename) +{ + struct Denomination *denom = cls; + struct GNUNET_DISK_FileHandle *fh; + struct GNUNET_DISK_MapHandle *map; + void *ptr; + int fd; + struct stat sbuf; + + { + struct stat lsbuf; + + if (0 != lstat (filename, + &lsbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "lstat", + filename); + return GNUNET_OK; + } + if (! S_ISREG (lsbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + return GNUNET_OK; + } + } + + fd = open (filename, + O_RDONLY | O_CLOEXEC); + if (-1 == fd) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + return GNUNET_OK; + } + if (0 != fstat (fd, + &sbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "stat", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (! S_ISREG (sbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) + { + /* permission are NOT tight, try to patch them up! */ + if (0 != + fchmod (fd, + S_IRUSR)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "fchmod", + filename); + /* refuse to use key if file has wrong permissions */ + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + } + fh = GNUNET_DISK_get_handle_from_int_fd (fd); + if (NULL == fh) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (sbuf.st_size != sizeof(struct GNUNET_CRYPTO_CsPrivateKey)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' too big to be a private key\n", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + ptr = GNUNET_DISK_file_map (fh, + &map, + GNUNET_DISK_MAP_TYPE_READ, + (size_t) sbuf.st_size); + if (NULL == ptr) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "mmap", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + parse_key (denom, + filename, + (const struct GNUNET_CRYPTO_CsPrivateKey *) ptr); + GNUNET_DISK_file_unmap (map); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; +} + + +/** + * Parse configuration for denomination type parameters. Also determines + * our anchor by looking at the existing denominations of the same type. + * + * @param cfg configuration to use + * @param ct section in the configuration file giving the denomination type parameters + * @param[out] denom set to the denomination parameters from the configuration + * @return #GNUNET_OK on success, #GNUNET_SYSERR if the configuration is invalid + */ +static enum GNUNET_GenericReturnValue +parse_denomination_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg, + const char *ct, + struct Denomination *denom) +{ + char *secname; + + GNUNET_asprintf (&secname, + "%s-secmod-cs", + globals->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + ct, + "DURATION_WITHDRAW", + &denom->duration_withdraw)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + ct, + "DURATION_WITHDRAW"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if (GNUNET_TIME_relative_cmp (overlap_duration, + >=, + denom->duration_withdraw)) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + secname, + "OVERLAP_DURATION", + "Value given must be smaller than value for DURATION_WITHDRAW!"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + GNUNET_free (secname); + denom->section = GNUNET_strdup (ct); + return GNUNET_OK; +} + + +/** + * Closure for #load_denominations. + */ +struct LoadContext +{ + + /** + * Configuration to use. + */ + const struct GNUNET_CONFIGURATION_Handle *cfg; + + /** + * Current time to use. + */ + struct GNUNET_TIME_Timestamp t; + + /** + * Status, to be set to #GNUNET_SYSERR on failure + */ + enum GNUNET_GenericReturnValue ret; +}; + + +/** + * Generate new denomination signing keys for the denomination type of the given @a + * denomination_alias. + * + * @param cls a `struct LoadContext`, with 'ret' to be set to #GNUNET_SYSERR on failure + * @param denomination_alias name of the denomination's section in the configuration + */ +static void +load_denominations (void *cls, + const char *denomination_alias) +{ + struct LoadContext *ctx = cls; + struct Denomination *denom; + bool wake = true; + char *cipher; + + if ( (0 != strncasecmp (denomination_alias, + "coin_", + strlen ("coin_"))) && + (0 != strncasecmp (denomination_alias, + "coin-", + strlen ("coin-"))) ) + return; /* not a denomination type definition */ + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_string (ctx->cfg, + denomination_alias, + "CIPHER", + &cipher)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + denomination_alias, + "CIPHER"); + return; + } + if (0 != strcmp (cipher, "CS")) + { + GNUNET_free (cipher); + return; /* Ignore denominations of other types than CS*/ + } + GNUNET_free (cipher); + + denom = GNUNET_new (struct Denomination); + if (GNUNET_OK != + parse_denomination_cfg (ctx->cfg, + denomination_alias, + denom)) + { + ctx->ret = GNUNET_SYSERR; + GNUNET_free (denom); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Loading keys for denomination %s\n", + denom->section); + { + char *dname; + + GNUNET_asprintf (&dname, + "%s/%s", + keydir, + denom->section); + GNUNET_break (GNUNET_OK == + GNUNET_DISK_directory_create (dname)); + GNUNET_DISK_directory_scan (dname, + &import_key, + denom); + GNUNET_free (dname); + } + GNUNET_CONTAINER_DLL_insert (denom_head, + denom_tail, + denom); + update_keys (denom, + ctx->t, + &wake); +} + + +/** + * Load the various duration values from @a cfg + * + * @param cfg configuration to use + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + char *secname; + + GNUNET_asprintf (&secname, + "%s-secmod-cs", + globals->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "OVERLAP_DURATION", + &overlap_duration)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "OVERLAP_DURATION"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "LOOKAHEAD_SIGN", + &lookahead_sign)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "LOOKAHEAD_SIGN"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + GNUNET_free (secname); + return GNUNET_OK; +} + + +/** + * Function run on shutdown. Stops the various jobs (nicely). + * + * @param cls a `struct TALER_SECMOD_Options` + */ +static void +do_shutdown (void *cls) +{ + (void) cls; + TES_listen_stop (); + if (NULL != keygen_task) + { + GNUNET_SCHEDULER_cancel (keygen_task); + keygen_task = NULL; + } + stop_workers (); + sem_done (&worker_sem); +} + + +void +TALER_SECMOD_cs_run (void *cls, + char *const *args, + const char *cfgfile, + const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + static struct TES_Callbacks cb = { + .dispatch = &cs_work_dispatch, + .updater = &cs_update_client_keys, + .init = &cs_client_init + }; + struct TALER_SECMOD_Options *opt = cls; + char *secname; + + (void) args; + (void) cfgfile; + globals = opt; + if (GNUNET_TIME_timestamp_cmp (opt->global_now, + !=, + opt->global_now_tmp)) + { + /* The user gave "--now", use it! */ + opt->global_now = opt->global_now_tmp; + } + else + { + /* get current time again, we may be timetraveling! */ + opt->global_now = GNUNET_TIME_timestamp_get (); + } + GNUNET_asprintf (&secname, + "%s-secmod-cs", + opt->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_filename (cfg, + secname, + "KEY_DIR", + &keydir)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "KEY_DIR"); + GNUNET_free (secname); + opt->global_ret = EXIT_NOTCONFIGURED; + return; + } + if (GNUNET_OK != + load_durations (cfg)) + { + opt->global_ret = EXIT_NOTCONFIGURED; + GNUNET_free (secname); + return; + } + opt->global_ret = TES_listen_start (cfg, + secname, + &cb); + GNUNET_free (secname); + if (0 != opt->global_ret) + return; + sem_init (&worker_sem, + 0); + GNUNET_SCHEDULER_add_shutdown (&do_shutdown, + opt); + if (0 == opt->max_workers) + { + long lret; + + lret = sysconf (_SC_NPROCESSORS_CONF); + if (lret <= 0) + lret = 1; + opt->max_workers = (unsigned int) lret; + } + for (unsigned int i = 0; i<opt->max_workers; i++) + if (GNUNET_OK != + start_worker ()) + { + GNUNET_SCHEDULER_shutdown (); + return; + } + /* Load denominations */ + keys = GNUNET_CONTAINER_multihashmap_create (65536, + true); + { + struct LoadContext lc = { + .cfg = cfg, + .ret = GNUNET_OK, + .t = opt->global_now + }; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_CONFIGURATION_iterate_sections (cfg, + &load_denominations, + &lc); + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (GNUNET_OK != lc.ret) + { + opt->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + } + } + if (NULL == denom_head) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "No CS denominations configured\n"); + TES_wake_clients (); + return; + } + /* start job to keep keys up-to-date; MUST be run before the #listen_task, + hence with priority. */ + keygen_task = GNUNET_SCHEDULER_add_with_priority ( + GNUNET_SCHEDULER_PRIORITY_URGENT, + &update_denominations, + NULL); +} diff --git a/src/util/secmod_eddsa.c b/src/util/secmod_eddsa.c new file mode 100644 index 000000000..9661534a8 --- /dev/null +++ b/src/util/secmod_eddsa.c @@ -0,0 +1,1130 @@ +/* + This file is part of TALER + Copyright (C) 2014-2021 Taler Systems SA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file util/secmod_eddsa.c + * @brief Standalone process to perform private key EDDSA operations + * @author Christian Grothoff + * + * Key design points: + * - EVERY thread of the exchange will have its own pair of connections to the + * crypto helpers. This way, every threat will also have its own /keys state + * and avoid the need to synchronize on those. + * - auditor signatures and master signatures are to be kept in the exchange DB, + * and merged with the public keys of the helper by the exchange HTTPD! + * - the main loop of the helper is SINGLE-THREADED, but there are + * threads for crypto-workers which (only) do the signing in parallel, + * one per client. + * - thread-safety: signing happens in parallel, thus when REMOVING private keys, + * we must ensure that all signers are done before we fully free() the + * private key. This is done by reference counting (as work is always + * assigned and collected by the main thread). + */ +#include "platform.h" +#include "taler_util.h" +#include "taler-exchange-secmod-eddsa.h" +#include <gcrypt.h> +#include <pthread.h> +#include "taler_error_codes.h" +#include "taler_signatures.h" +#include "secmod_common.h" +#include <poll.h> + + +/** + * One particular key. + */ +struct Key +{ + + /** + * Kept in a DLL. Sorted by anchor time. + */ + struct Key *next; + + /** + * Kept in a DLL. Sorted by anchor time. + */ + struct Key *prev; + + /** + * Name of the file this key is stored under. + */ + char *filename; + + /** + * The private key. + */ + struct TALER_ExchangePrivateKeyP exchange_priv; + + /** + * The public key. + */ + struct TALER_ExchangePublicKeyP exchange_pub; + + /** + * Time at which this key is supposed to become valid. + */ + struct GNUNET_TIME_Timestamp anchor; + + /** + * Generation when this key was created or revoked. + */ + uint64_t key_gen; + + /** + * Reference counter. Counts the number of threads that are + * using this key at this time. + */ + unsigned int rc; + + /** + * Flag set to true if this key has been purged and the memory + * must be freed as soon as @e rc hits zero. + */ + bool purge; + +}; + + +/** + * Head of DLL of actual keys, sorted by anchor. + */ +static struct Key *keys_head; + +/** + * Tail of DLL of actual keys. + */ +static struct Key *keys_tail; + +/** + * How long can a key be used? + */ +static struct GNUNET_TIME_Relative duration; + +/** + * Command-line options for various TALER_SECMOD_XXX_run() functions. + */ +static struct TALER_SECMOD_Options *globals; + +/** + * Where do we store the keys? + */ +static char *keydir; + +/** + * How much should coin creation duration overlap + * with the next key? Basically, the starting time of two + * keys is always #duration - #overlap_duration apart. + */ +static struct GNUNET_TIME_Relative overlap_duration; + +/** + * How long into the future do we pre-generate keys? + */ +static struct GNUNET_TIME_Relative lookahead_sign; + +/** + * Task run to generate new keys. + */ +static struct GNUNET_SCHEDULER_Task *keygen_task; + +/** + * Lock for the keys queue. + */ +static pthread_mutex_t keys_lock; + +/** + * Current key generation. + */ +static uint64_t key_gen; + + +/** + * Notify @a client about @a key becoming available. + * + * @param[in,out] client the client to notify; possible freed if transmission fails + * @param key the key to notify @a client about + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +notify_client_key_add (struct TES_Client *client, + const struct Key *key) +{ + struct TALER_CRYPTO_EddsaKeyAvailableNotification an = { + .header.size = htons (sizeof (an)), + .header.type = htons (TALER_HELPER_EDDSA_MT_AVAIL), + .anchor_time = GNUNET_TIME_timestamp_hton (key->anchor), + .duration = GNUNET_TIME_relative_hton (duration), + .exchange_pub = key->exchange_pub, + .secm_pub = TES_smpub + }; + + TALER_exchange_secmod_eddsa_sign (&key->exchange_pub, + key->anchor, + duration, + &TES_smpriv, + &an.secm_sig); + if (GNUNET_OK != + TES_transmit (client->csock, + &an.header)) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Client %p must have disconnected\n", + client); + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * Notify @a client about @a key being purged. + * + * @param[in,out] client the client to notify; possible freed if transmission fails + * @param key the key to notify @a client about + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +notify_client_key_del (struct TES_Client *client, + const struct Key *key) +{ + struct TALER_CRYPTO_EddsaKeyPurgeNotification pn = { + .header.type = htons (TALER_HELPER_EDDSA_MT_PURGE), + .header.size = htons (sizeof (pn)), + .exchange_pub = key->exchange_pub + }; + + if (GNUNET_OK != + TES_transmit (client->csock, + &pn.header)) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Client %p must have disconnected\n", + client); + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * Handle @a client request @a sr to create signature. Create the + * signature using the respective key and return the result to + * the client. + * + * @param client the client making the request + * @param sr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_sign_request (struct TES_Client *client, + const struct TALER_CRYPTO_EddsaSignRequest *sr) +{ + const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose = &sr->purpose; + size_t purpose_size = ntohs (sr->header.size) - sizeof (*sr) + + sizeof (*purpose); + struct Key *key; + struct TALER_CRYPTO_EddsaSignResponse sres = { + .header.size = htons (sizeof (sres)), + .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGNATURE) + }; + enum TALER_ErrorCode ec; + + if (purpose_size != htonl (purpose->size)) + { + struct TALER_CRYPTO_EddsaSignFailure sf = { + .header.size = htons (sizeof (sr)), + .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGN_FAILURE), + .ec = htonl (TALER_EC_GENERIC_PARAMETER_MALFORMED) + }; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Signing request failed, request malformed\n"); + return TES_transmit (client->csock, + &sf.header); + } + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + key = keys_head; + while ( (NULL != key) && + (GNUNET_TIME_absolute_is_past ( + GNUNET_TIME_absolute_add (key->anchor.abs_time, + duration))) ) + { + struct Key *nxt = key->next; + + if (0 != key->rc) + break; /* do later */ + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Deleting past key %s (expired %s ago)\n", + TALER_B2S (&nxt->exchange_pub), + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_duration ( + GNUNET_TIME_absolute_add (key->anchor.abs_time, + duration)), + GNUNET_YES)); + GNUNET_CONTAINER_DLL_remove (keys_head, + keys_tail, + key); + if ( (! key->purge) && + (0 != unlink (key->filename)) ) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + key->filename); + GNUNET_free (key->filename); + GNUNET_free (key); + key = nxt; + } + if (NULL == key) + { + GNUNET_break (0); + ec = TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING; + } + else + { + GNUNET_assert (key->rc < UINT_MAX); + key->rc++; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + + if (GNUNET_OK != + GNUNET_CRYPTO_eddsa_sign_ (&key->exchange_priv.eddsa_priv, + purpose, + &sres.exchange_sig.eddsa_signature)) + ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE; + else + ec = TALER_EC_NONE; + sres.exchange_pub = key->exchange_pub; + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_assert (key->rc > 0); + key->rc--; + } + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (TALER_EC_NONE != ec) + { + struct TALER_CRYPTO_EddsaSignFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGN_FAILURE), + .ec = htonl ((uint32_t) ec) + }; + + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Signing request %p failed, worker failed to produce signature\n", + client); + return TES_transmit (client->csock, + &sf.header); + } + return TES_transmit (client->csock, + &sres.header); +} + + +/** + * Initialize key material for key @a key (also on disk). + * + * @param[in,out] key to compute key material for + * @param position where in the DLL will the @a key go + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +setup_key (struct Key *key, + struct Key *position) +{ + struct GNUNET_CRYPTO_EddsaPrivateKey priv; + struct GNUNET_CRYPTO_EddsaPublicKey pub; + + GNUNET_CRYPTO_eddsa_key_create (&priv); + GNUNET_CRYPTO_eddsa_key_get_public (&priv, + &pub); + GNUNET_asprintf (&key->filename, + "%s/%llu", + keydir, + (unsigned long long) (key->anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us + )); + if (GNUNET_OK != + GNUNET_DISK_fn_write (key->filename, + &priv, + sizeof (priv), + GNUNET_DISK_PERM_USER_READ)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "write", + key->filename); + return GNUNET_SYSERR; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Setup fresh private key in `%s'\n", + key->filename); + key->key_gen = key_gen; + key->exchange_priv.eddsa_priv = priv; + key->exchange_pub.eddsa_pub = pub; + GNUNET_CONTAINER_DLL_insert_after (keys_head, + keys_tail, + position, + key); + return GNUNET_OK; +} + + +/** + * The validity period of a key @a key has expired. Purge it. + * + * @param[in] key expired or revoked key to purge + */ +static void +purge_key (struct Key *key) +{ + if (key->purge) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Key %s already purged, skipping\n", + TALER_B2S (&key->exchange_pub)); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Purging key %s\n", + TALER_B2S (&key->exchange_pub)); + if (0 != unlink (key->filename)) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + key->filename); + key->purge = true; + key->key_gen = key_gen; + GNUNET_free (key->filename); +} + + +/** + * A @a client informs us that a key has been revoked. + * Check if the key is still in use, and if so replace (!) + * it with a fresh key. + * + * @param client the client making the request + * @param rr the revocation request + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_revoke_request (struct TES_Client *client, + const struct TALER_CRYPTO_EddsaRevokeRequest *rr) +{ + struct Key *key; + struct Key *nkey; + + (void) client; + key = NULL; + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Key *pos = keys_head; + NULL != pos; + pos = pos->next) + if (0 == GNUNET_memcmp (&pos->exchange_pub, + &rr->exchange_pub)) + { + key = pos; + break; + } + if (NULL == key) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, key unknown\n"); + return GNUNET_OK; + } + if (key->purge) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, key %s already revoked\n", + TALER_B2S (&key->exchange_pub)); + return GNUNET_OK; + } + key_gen++; + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Revoking key %s, bumping generation to %llu\n", + TALER_B2S (&key->exchange_pub), + (unsigned long long) key_gen); + purge_key (key); + + /* Setup replacement key */ + nkey = GNUNET_new (struct Key); + nkey->anchor = key->anchor; + if (GNUNET_OK != + setup_key (nkey, + key)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_break (0); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + TES_wake_clients (); + return GNUNET_OK; +} + + +/** + * Handle @a hdr message received from @a client. + * + * @param client the client that received the message + * @param hdr message that was received + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +eddsa_work_dispatch (struct TES_Client *client, + const struct GNUNET_MessageHeader *hdr) +{ + uint16_t msize = ntohs (hdr->size); + + switch (ntohs (hdr->type)) + { + case TALER_HELPER_EDDSA_MT_REQ_SIGN: + if (msize < sizeof (struct TALER_CRYPTO_EddsaSignRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_sign_request ( + client, + (const struct TALER_CRYPTO_EddsaSignRequest *) hdr); + case TALER_HELPER_EDDSA_MT_REQ_REVOKE: + if (msize != sizeof (struct TALER_CRYPTO_EddsaRevokeRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_revoke_request ( + client, + (const struct TALER_CRYPTO_EddsaRevokeRequest *) hdr); + default: + GNUNET_break_op (0); + return GNUNET_SYSERR; + } +} + + +/** + * Send our initial key set to @a client together with the + * "sync" terminator. + * + * @param client the client to inform + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +eddsa_client_init (struct TES_Client *client) +{ + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Key *key = keys_head; + NULL != key; + key = key->next) + { + if (GNUNET_OK != + notify_client_key_add (client, + key)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_break (0); + return GNUNET_SYSERR; + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + { + struct GNUNET_MessageHeader synced = { + .type = htons (TALER_HELPER_EDDSA_SYNCED), + .size = htons (sizeof (synced)) + }; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Client %p synced\n", + client); + if (GNUNET_OK != + TES_transmit (client->csock, + &synced)) + { + GNUNET_break (0); + return GNUNET_SYSERR; + } + } + return GNUNET_OK; +} + + +/** + * Notify @a client about all changes to the keys since + * the last generation known to the @a client. + * + * @param client the client to notify + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +eddsa_update_client_keys (struct TES_Client *client) +{ + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Updating client %p to generation %llu\n", + client, + (unsigned long long) key_gen); + for (struct Key *key = keys_head; + NULL != key; + key = key->next) + { + if (key->key_gen <= client->key_gen) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Skipping key %s, no change since generation %llu\n", + TALER_B2S (&key->exchange_pub), + (unsigned long long) client->key_gen); + continue; + } + if (key->purge) + { + if (GNUNET_OK != + notify_client_key_del (client, + key)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return GNUNET_SYSERR; + } + } + else + { + if (GNUNET_OK != + notify_client_key_add (client, + key)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return GNUNET_SYSERR; + } + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return GNUNET_OK; +} + + +/** + * Create a new key (we do not have enough). + * + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +create_key (void) +{ + struct Key *key; + struct GNUNET_TIME_Timestamp anchor; + + anchor = GNUNET_TIME_timestamp_get (); + if (NULL != keys_tail) + { + struct GNUNET_TIME_Absolute abs; + + abs = GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, + GNUNET_TIME_relative_subtract ( + duration, + overlap_duration)); + if (GNUNET_TIME_absolute_cmp (anchor.abs_time, + <, + abs)) + anchor = GNUNET_TIME_absolute_to_timestamp (abs); + } + key = GNUNET_new (struct Key); + key->anchor = anchor; + if (GNUNET_OK != + setup_key (key, + keys_tail)) + { + GNUNET_break (0); + GNUNET_free (key); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * At what time does the current key set require its next action? Basically, + * the minimum of the expiration time of the oldest key, and the expiration + * time of the newest key minus the #lookahead_sign time. + */ +static struct GNUNET_TIME_Absolute +key_action_time (void) +{ + struct Key *nxt; + + nxt = keys_head; + while ( (NULL != nxt) && + (nxt->purge) ) + nxt = nxt->next; + if (NULL == nxt) + return GNUNET_TIME_UNIT_ZERO_ABS; + return GNUNET_TIME_absolute_min ( + GNUNET_TIME_absolute_add (nxt->anchor.abs_time, + duration), + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, + duration), + lookahead_sign), + overlap_duration)); +} + + +/** + * Create new keys and expire ancient keys. + * + * @param cls NULL + */ +static void +update_keys (void *cls) +{ + bool wake = false; + struct Key *nxt; + + (void) cls; + keygen_task = NULL; + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + /* create new keys */ + while ( (NULL == keys_tail) || + GNUNET_TIME_absolute_is_past ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, + duration), + lookahead_sign), + overlap_duration)) ) + { + if (! wake) + { + key_gen++; + wake = true; + } + if (GNUNET_OK != + create_key ()) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_break (0); + globals->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + } + } + nxt = keys_head; + /* purge expired keys */ + while ( (NULL != nxt) && + GNUNET_TIME_absolute_is_past ( + GNUNET_TIME_absolute_add (nxt->anchor.abs_time, + duration))) + { + if (! wake) + { + key_gen++; + wake = true; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Purging past key %s (expired %s ago)\n", + TALER_B2S (&nxt->exchange_pub), + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_duration ( + GNUNET_TIME_absolute_add (nxt->anchor.abs_time, + duration)), + GNUNET_YES)); + purge_key (nxt); + nxt = nxt->next; + } + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (wake) + TES_wake_clients (); + keygen_task = GNUNET_SCHEDULER_add_at (key_action_time (), + &update_keys, + NULL); +} + + +/** + * Parse private key from @a filename in @a buf. + * + * @param filename name of the file we are parsing, for logging + * @param buf key material + * @param buf_size number of bytes in @a buf + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +parse_key (const char *filename, + const void *buf, + size_t buf_size) +{ + struct GNUNET_CRYPTO_EddsaPrivateKey priv; + char *anchor_s; + char dummy; + unsigned long long anchor_ll; + struct GNUNET_TIME_Timestamp anchor; + + anchor_s = strrchr (filename, + '/'); + if (NULL == anchor_s) + { + /* File in a directory without '/' in the name, this makes no sense. */ + GNUNET_break (0); + return GNUNET_SYSERR; + } + anchor_s++; + if (1 != sscanf (anchor_s, + "%llu%c", + &anchor_ll, + &dummy)) + { + /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return GNUNET_SYSERR; + } + anchor.abs_time.abs_value_us = anchor_ll + * GNUNET_TIME_UNIT_SECONDS.rel_value_us; + if (anchor_ll != anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us) + { + /* Integer overflow. Bad, invalid filename. */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return GNUNET_SYSERR; + } + if (buf_size != sizeof (priv)) + { + /* Parser failure. */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "File `%s' is malformed, skipping\n", + filename); + return GNUNET_SYSERR; + } + GNUNET_memcpy (&priv, + buf, + buf_size); + + { + struct GNUNET_CRYPTO_EddsaPublicKey pub; + struct Key *key; + struct Key *before; + + GNUNET_CRYPTO_eddsa_key_get_public (&priv, + &pub); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + key = GNUNET_new (struct Key); + key->exchange_priv.eddsa_priv = priv; + key->exchange_pub.eddsa_pub = pub; + key->anchor = anchor; + key->filename = GNUNET_strdup (filename); + key->key_gen = key_gen; + before = NULL; + for (struct Key *pos = keys_head; + NULL != pos; + pos = pos->next) + { + if (GNUNET_TIME_timestamp_cmp (pos->anchor, >, anchor)) + break; + before = pos; + } + GNUNET_CONTAINER_DLL_insert_after (keys_head, + keys_tail, + before, + key); + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Imported key from `%s'\n", + filename); + } + return GNUNET_OK; +} + + +/** + * Import a private key from @a filename. + * + * @param cls NULL + * @param filename name of a file in the directory + */ +static enum GNUNET_GenericReturnValue +import_key (void *cls, + const char *filename) +{ + struct GNUNET_DISK_FileHandle *fh; + struct GNUNET_DISK_MapHandle *map; + void *ptr; + int fd; + struct stat sbuf; + + (void) cls; + { + struct stat lsbuf; + + if (0 != lstat (filename, + &lsbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "lstat", + filename); + return GNUNET_OK; + } + if (! S_ISREG (lsbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + return GNUNET_OK; + } + } + + fd = open (filename, + O_RDONLY | O_CLOEXEC); + if (-1 == fd) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + return GNUNET_OK; + } + if (0 != fstat (fd, + &sbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "stat", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (! S_ISREG (sbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) + { + /* permission are NOT tight, try to patch them up! */ + if (0 != + fchmod (fd, + S_IRUSR)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "fchmod", + filename); + /* refuse to use key if file has wrong permissions */ + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + } + fh = GNUNET_DISK_get_handle_from_int_fd (fd); + if (NULL == fh) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (sbuf.st_size > 2048) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' to big to be a private key\n", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + ptr = GNUNET_DISK_file_map (fh, + &map, + GNUNET_DISK_MAP_TYPE_READ, + (size_t) sbuf.st_size); + if (NULL == ptr) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "mmap", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + (void) parse_key (filename, + ptr, + (size_t) sbuf.st_size); + GNUNET_DISK_file_unmap (map); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; +} + + +/** + * Load the various duration values from @a kcfg. + * + * @param cfg configuration to use + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + char *secname; + + GNUNET_asprintf (&secname, + "%s-secmod-eddsa", + globals->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "OVERLAP_DURATION", + &overlap_duration)) + { + GNUNET_free (secname); + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "OVERLAP_DURATION"); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "DURATION", + &duration)) + { + GNUNET_free (secname); + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "DURATION"); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "LOOKAHEAD_SIGN", + &lookahead_sign)) + { + GNUNET_free (secname); + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "LOOKAHEAD_SIGN"); + return GNUNET_SYSERR; + } + GNUNET_free (secname); + return GNUNET_OK; +} + + +/** + * Function run on shutdown. Stops the various jobs (nicely). + * + * @param cls NULL + */ +static void +do_shutdown (void *cls) +{ + (void) cls; + TES_listen_stop (); + if (NULL != keygen_task) + { + GNUNET_SCHEDULER_cancel (keygen_task); + keygen_task = NULL; + } +} + + +void +TALER_SECMOD_eddsa_run (void *cls, + char *const *args, + const char *cfgfile, + const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + static struct TES_Callbacks cb = { + .dispatch = eddsa_work_dispatch, + .updater = eddsa_update_client_keys, + .init = eddsa_client_init + }; + struct TALER_SECMOD_Options *opt = cls; + char *secname; + + (void) args; + (void) cfgfile; + globals = opt; + if (GNUNET_TIME_timestamp_cmp (opt->global_now, + !=, + opt->global_now_tmp)) + { + /* The user gave "--now", use it! */ + opt->global_now = opt->global_now_tmp; + } + else + { + /* get current time again, we may be timetraveling! */ + opt->global_now = GNUNET_TIME_timestamp_get (); + } + GNUNET_asprintf (&secname, + "%s-secmod-eddsa", + opt->section); + if (GNUNET_OK != + load_durations (cfg)) + { + opt->global_ret = EXIT_NOTCONFIGURED; + return; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_filename (cfg, + secname, + "KEY_DIR", + &keydir)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "KEY_DIR"); + GNUNET_free (secname); + opt->global_ret = EXIT_NOTCONFIGURED; + return; + } + GNUNET_SCHEDULER_add_shutdown (&do_shutdown, + NULL); + opt->global_ret = TES_listen_start (cfg, + secname, + &cb); + if (0 != opt->global_ret) + return; + /* Load keys */ + GNUNET_break (GNUNET_OK == + GNUNET_DISK_directory_create (keydir)); + GNUNET_DISK_directory_scan (keydir, + &import_key, + NULL); + if ( (NULL != keys_head) && + (GNUNET_TIME_absolute_is_future (keys_head->anchor.abs_time)) ) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Existing anchor is in %s the future. Refusing to start\n", + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_remaining ( + keys_head->anchor.abs_time), + true)); + opt->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + } + /* start job to keep keys up-to-date; MUST be run before the #listen_task, + hence with priority. */ + keygen_task = GNUNET_SCHEDULER_add_with_priority ( + GNUNET_SCHEDULER_PRIORITY_URGENT, + &update_keys, + NULL); +} diff --git a/src/util/secmod_rsa.c b/src/util/secmod_rsa.c new file mode 100644 index 000000000..4217cbb33 --- /dev/null +++ b/src/util/secmod_rsa.c @@ -0,0 +1,2053 @@ +/* + This file is part of TALER + Copyright (C) 2014-2024 Taler Systems SA + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> +*/ +/** + * @file util/taler-exchange-secmod-rsa.c + * @brief Standalone process to perform private key RSA operations + * @author Christian Grothoff + * + * Key design points: + * - EVERY thread of the exchange will have its own pair of connections to the + * crypto helpers. This way, every thread will also have its own /keys state + * and avoid the need to synchronize on those. + * - auditor signatures and master signatures are to be kept in the exchange DB, + * and merged with the public keys of the helper by the exchange HTTPD! + * - the main loop of the helper is SINGLE-THREADED, but there are + * threads for crypto-workers which do the signing in parallel, one per client. + * - thread-safety: signing happens in parallel, thus when REMOVING private keys, + * we must ensure that all signers are done before we fully free() the + * private key. This is done by reference counting (as work is always + * assigned and collected by the main thread). + */ +#include "platform.h" +#include "taler_util.h" +#include "taler-exchange-secmod-rsa.h" +#include <gcrypt.h> +#include <pthread.h> +#include "taler_error_codes.h" +#include "taler_signatures.h" +#include "secmod_common.h" +#include <poll.h> + + +/** + * Information we keep per denomination. + */ +struct Denomination; + + +/** + * One particular denomination key. + */ +struct DenominationKey +{ + + /** + * Kept in a DLL of the respective denomination. Sorted by anchor time. + */ + struct DenominationKey *next; + + /** + * Kept in a DLL of the respective denomination. Sorted by anchor time. + */ + struct DenominationKey *prev; + + /** + * Denomination this key belongs to. + */ + struct Denomination *denom; + + /** + * Name of the file this key is stored under. + */ + char *filename; + + /** + * The private key of the denomination. + */ + struct GNUNET_CRYPTO_RsaPrivateKey *denom_priv; + + /** + * The public key of the denomination. + */ + struct GNUNET_CRYPTO_RsaPublicKey *denom_pub; + + /** + * Message to transmit to clients to introduce this public key. + */ + struct TALER_CRYPTO_RsaKeyAvailableNotification *an; + + /** + * Hash of this denomination's public key. + */ + struct TALER_RsaPubHashP h_rsa; + + /** + * Time at which this key is supposed to become valid. + */ + struct GNUNET_TIME_Timestamp anchor; + + /** + * Generation when this key was created or revoked. + */ + uint64_t key_gen; + + /** + * Reference counter. Counts the number of threads that are + * using this key at this time. + */ + unsigned int rc; + + /** + * Flag set to true if this key has been purged and the memory + * must be freed as soon as @e rc hits zero. + */ + bool purge; + +}; + + +struct Denomination +{ + + /** + * Kept in a DLL. Sorted by #denomination_action_time(). + */ + struct Denomination *next; + + /** + * Kept in a DLL. Sorted by #denomination_action_time(). + */ + struct Denomination *prev; + + /** + * Head of DLL of actual keys of this denomination. + */ + struct DenominationKey *keys_head; + + /** + * Tail of DLL of actual keys of this denomination. + */ + struct DenominationKey *keys_tail; + + /** + * How long can coins be withdrawn (generated)? Should be small + * enough to limit how many coins will be signed into existence with + * the same key, but large enough to still provide a reasonable + * anonymity set. + */ + struct GNUNET_TIME_Relative duration_withdraw; + + /** + * What is the configuration section of this denomination type? Also used + * for the directory name where the denomination keys are stored. + */ + char *section; + + /** + * Length of (new) RSA keys (in bits). + */ + uint32_t rsa_keysize; +}; + + +/** + * A semaphore. + */ +struct Semaphore +{ + /** + * Mutex for the semaphore. + */ + pthread_mutex_t mutex; + + /** + * Condition variable for the semaphore. + */ + pthread_cond_t cv; + + /** + * Counter of the semaphore. + */ + unsigned int ctr; +}; + + +/** + * Job in a batch sign request. + */ +struct BatchJob; + +/** + * Handle for a thread that does work in batch signing. + */ +struct Worker +{ + /** + * Kept in a DLL. + */ + struct Worker *prev; + + /** + * Kept in a DLL. + */ + struct Worker *next; + + /** + * Job this worker should do next. + */ + struct BatchJob *job; + + /** + * Semaphore to signal the worker that a job is available. + */ + struct Semaphore sem; + + /** + * Handle for this thread. + */ + pthread_t pt; + + /** + * Set to true if the worker should terminate. + */ + bool do_shutdown; +}; + + +/** + * Job in a batch sign request. + */ +struct BatchJob +{ + /** + * Request we are working on. + */ + const struct TALER_CRYPTO_SignRequest *sr; + + /** + * Thread doing the work. + */ + struct Worker *worker; + + /** + * Result with the signature. + */ + struct GNUNET_CRYPTO_RsaSignature *rsa_signature; + + /** + * Semaphore to signal that the job is finished. + */ + struct Semaphore sem; + + /** + * Computation status. + */ + enum TALER_ErrorCode ec; + +}; + + +/** + * Head of DLL of workers ready for more work. + */ +static struct Worker *worker_head; + +/** + * Tail of DLL of workers ready for more work. + */ +static struct Worker *worker_tail; + +/** + * Lock for manipulating the worker DLL. + */ +static pthread_mutex_t worker_lock; + +/** + * Total number of workers that were started. + */ +static unsigned int workers; + +/** + * Semaphore used to grab a worker. + */ +static struct Semaphore worker_sem; + +/** + * Command-line options for various TALER_SECMOD_XXX_run() functions. + */ +static struct TALER_SECMOD_Options *globals; + +/** + * Where do we store the keys? + */ +static char *keydir; + +/** + * How much should coin creation (@e duration_withdraw) duration overlap + * with the next denomination? Basically, the starting time of two + * denominations is always @e duration_withdraw - #overlap_duration apart. + */ +static struct GNUNET_TIME_Relative overlap_duration; + +/** + * How long into the future do we pre-generate keys? + */ +static struct GNUNET_TIME_Relative lookahead_sign; + +/** + * All of our denominations, in a DLL. Sorted? + */ +static struct Denomination *denom_head; + +/** + * All of our denominations, in a DLL. Sorted? + */ +static struct Denomination *denom_tail; + +/** + * Map of hashes of public (RSA) keys to `struct DenominationKey *` + * with the respective private keys. + */ +static struct GNUNET_CONTAINER_MultiHashMap *keys; + +/** + * Task run to generate new keys. + */ +static struct GNUNET_SCHEDULER_Task *keygen_task; + +/** + * Lock for the keys queue. + */ +static pthread_mutex_t keys_lock; + +/** + * Current key generation. + */ +static uint64_t key_gen; + + +/** + * Generate the announcement message for @a dk. + * + * @param[in,out] dk denomination key to generate the announcement for + */ +static void +generate_response (struct DenominationKey *dk) +{ + struct Denomination *denom = dk->denom; + size_t nlen = strlen (denom->section) + 1; + struct TALER_CRYPTO_RsaKeyAvailableNotification *an; + size_t buf_len; + void *buf; + void *p; + size_t tlen; + + buf_len = GNUNET_CRYPTO_rsa_public_key_encode (dk->denom_pub, + &buf); + GNUNET_assert (buf_len < UINT16_MAX); + GNUNET_assert (nlen < UINT16_MAX); + tlen = buf_len + nlen + sizeof (*an); + GNUNET_assert (tlen < UINT16_MAX); + an = GNUNET_malloc (tlen); + an->header.size = htons ((uint16_t) tlen); + an->header.type = htons (TALER_HELPER_RSA_MT_AVAIL); + an->pub_size = htons ((uint16_t) buf_len); + an->section_name_len = htons ((uint16_t) nlen); + an->anchor_time = GNUNET_TIME_timestamp_hton (dk->anchor); + an->duration_withdraw = GNUNET_TIME_relative_hton (denom->duration_withdraw); + TALER_exchange_secmod_rsa_sign (&dk->h_rsa, + denom->section, + dk->anchor, + denom->duration_withdraw, + &TES_smpriv, + &an->secm_sig); + an->secm_pub = TES_smpub; + p = (void *) &an[1]; + GNUNET_memcpy (p, + buf, + buf_len); + GNUNET_free (buf); + GNUNET_memcpy (p + buf_len, + denom->section, + nlen); + dk->an = an; +} + + +/** + * Do the actual signing work. + * + * @param h_rsa key to sign with + * @param bm blinded message to sign + * @param[out] rsa_signaturep set to the RSA signature + * @return #TALER_EC_NONE on success + */ +static enum TALER_ErrorCode +do_sign (const struct TALER_RsaPubHashP *h_rsa, + const struct GNUNET_CRYPTO_RsaBlindedMessage *bm, + struct GNUNET_CRYPTO_RsaSignature **rsa_signaturep) +{ + struct DenominationKey *dk; + struct GNUNET_CRYPTO_RsaSignature *rsa_signature; + struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + dk = GNUNET_CONTAINER_multihashmap_get (keys, + &h_rsa->hash); + if (NULL == dk) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Signing request failed, denomination key %s unknown\n", + GNUNET_h2s (&h_rsa->hash)); + return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; + } + if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) + { + /* it is too early */ + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Signing request failed, denomination key %s is not yet valid\n", + GNUNET_h2s (&h_rsa->hash)); + return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; + } + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Received request to sign over %u bytes with key %s\n", + (unsigned int) bm->blinded_msg_size, + GNUNET_h2s (&h_rsa->hash)); + GNUNET_assert (dk->rc < UINT_MAX); + dk->rc++; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + rsa_signature + = GNUNET_CRYPTO_rsa_sign_blinded (dk->denom_priv, + bm); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_assert (dk->rc > 0); + dk->rc--; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (NULL == rsa_signature) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Signing request failed, worker failed to produce signature\n"); + return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE; + } + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Sending RSA signature after %s\n", + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_duration (now), + GNUNET_YES)); + *rsa_signaturep = rsa_signature; + return TALER_EC_NONE; +} + + +/** + * Generate error response that signing failed. + * + * @param client client to send response to + * @param ec error code to include + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +fail_sign (struct TES_Client *client, + enum TALER_ErrorCode ec) +{ + struct TALER_CRYPTO_SignFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_RSA_MT_RES_SIGN_FAILURE), + .ec = htonl (ec) + }; + + return TES_transmit (client->csock, + &sf.header); +} + + +/** + * Generate signature response. + * + * @param client client to send response to + * @param[in] rsa_signature signature to send, freed by this function + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +send_signature (struct TES_Client *client, + struct GNUNET_CRYPTO_RsaSignature *rsa_signature) +{ + struct TALER_CRYPTO_SignResponse *sr; + void *buf; + size_t buf_size; + size_t tsize; + enum GNUNET_GenericReturnValue ret; + + buf_size = GNUNET_CRYPTO_rsa_signature_encode (rsa_signature, + &buf); + GNUNET_CRYPTO_rsa_signature_free (rsa_signature); + tsize = sizeof (*sr) + buf_size; + GNUNET_assert (tsize < UINT16_MAX); + sr = GNUNET_malloc (tsize); + sr->header.size = htons (tsize); + sr->header.type = htons (TALER_HELPER_RSA_MT_RES_SIGNATURE); + GNUNET_memcpy (&sr[1], + buf, + buf_size); + GNUNET_free (buf); + ret = TES_transmit (client->csock, + &sr->header); + GNUNET_free (sr); + return ret; +} + + +/** + * Handle @a client request @a sr to create signature. Create the + * signature using the respective key and return the result to + * the client. + * + * @param client the client making the request + * @param sr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_sign_request (struct TES_Client *client, + const struct TALER_CRYPTO_SignRequest *sr) +{ + struct GNUNET_CRYPTO_RsaBlindedMessage bm = { + .blinded_msg = (void *) &sr[1], + .blinded_msg_size = ntohs (sr->header.size) - sizeof (*sr) + }; + struct GNUNET_CRYPTO_RsaSignature *rsa_signature; + enum TALER_ErrorCode ec; + + ec = do_sign (&sr->h_rsa, + &bm, + &rsa_signature); + if (TALER_EC_NONE != ec) + { + return fail_sign (client, + ec); + } + return send_signature (client, + rsa_signature); +} + + +/** + * Initialize a semaphore @a sem with a value of @a val. + * + * @param[out] sem semaphore to initialize + * @param val initial value of the semaphore + */ +static void +sem_init (struct Semaphore *sem, + unsigned int val) +{ + GNUNET_assert (0 == + pthread_mutex_init (&sem->mutex, + NULL)); + GNUNET_assert (0 == + pthread_cond_init (&sem->cv, + NULL)); + sem->ctr = val; +} + + +/** + * Decrement semaphore, blocks until this is possible. + * + * @param[in,out] sem semaphore to decrement + */ +static void +sem_down (struct Semaphore *sem) +{ + GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); + while (0 == sem->ctr) + { + pthread_cond_wait (&sem->cv, + &sem->mutex); + } + sem->ctr--; + GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); +} + + +/** + * Increment semaphore, blocks until this is possible. + * + * @param[in,out] sem semaphore to decrement + */ +static void +sem_up (struct Semaphore *sem) +{ + GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); + sem->ctr++; + GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); + pthread_cond_signal (&sem->cv); +} + + +/** + * Release resources used by @a sem. + * + * @param[in] sem semaphore to release (except the memory itself) + */ +static void +sem_done (struct Semaphore *sem) +{ + GNUNET_break (0 == pthread_cond_destroy (&sem->cv)); + GNUNET_break (0 == pthread_mutex_destroy (&sem->mutex)); +} + + +/** + * Main logic of a worker thread. Grabs work, does it, + * grabs more work. + * + * @param cls a `struct Worker *` + * @returns cls + */ +static void * +worker (void *cls) +{ + struct Worker *w = cls; + + while (true) + { + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + GNUNET_CONTAINER_DLL_insert (worker_head, + worker_tail, + w); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + sem_up (&worker_sem); + sem_down (&w->sem); + if (w->do_shutdown) + break; + { + struct BatchJob *bj = w->job; + const struct TALER_CRYPTO_SignRequest *sr = bj->sr; + struct GNUNET_CRYPTO_RsaBlindedMessage bm = { + .blinded_msg = (void *) &sr[1], + .blinded_msg_size = ntohs (sr->header.size) - sizeof (*sr) + }; + + bj->ec = do_sign (&sr->h_rsa, + &bm, + &bj->rsa_signature); + sem_up (&bj->sem); + w->job = NULL; + } + } + return w; +} + + +/** + * Start batch job @a bj to sign @a sr. + * + * @param sr signature request to answer + * @param[out] bj job data structure + */ +static void +start_job (const struct TALER_CRYPTO_SignRequest *sr, + struct BatchJob *bj) +{ + sem_init (&bj->sem, + 0); + bj->sr = sr; + sem_down (&worker_sem); + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + bj->worker = worker_head; + GNUNET_CONTAINER_DLL_remove (worker_head, + worker_tail, + bj->worker); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + bj->worker->job = bj; + sem_up (&bj->worker->sem); +} + + +/** + * Finish a job @a bj for a @a client. + * + * @param client who made the request + * @param[in,out] bj job to finish + */ +static void +finish_job (struct TES_Client *client, + struct BatchJob *bj) +{ + sem_down (&bj->sem); + sem_done (&bj->sem); + if (TALER_EC_NONE != bj->ec) + { + fail_sign (client, + bj->ec); + return; + } + GNUNET_assert (NULL != bj->rsa_signature); + send_signature (client, + bj->rsa_signature); + bj->rsa_signature = NULL; /* freed in send_signature */ +} + + +/** + * Handle @a client request @a sr to create a batch of signature. Creates the + * signatures using the respective key and return the results to the client. + * + * @param client the client making the request + * @param bsr the request details + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +handle_batch_sign_request (struct TES_Client *client, + const struct TALER_CRYPTO_BatchSignRequest *bsr) +{ + uint32_t bs = ntohl (bsr->batch_size); + uint16_t size = ntohs (bsr->header.size) - sizeof (*bsr); + const void *off = (const void *) &bsr[1]; + unsigned int idx = 0; + struct BatchJob jobs[bs]; + bool failure = false; + + if (bs > TALER_MAX_FRESH_COINS) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + while ( (bs > 0) && + (size > sizeof (struct TALER_CRYPTO_SignRequest)) ) + { + const struct TALER_CRYPTO_SignRequest *sr = off; + uint16_t s = ntohs (sr->header.size); + + if (s > size) + { + failure = true; + bs = idx; + break; + } + start_job (sr, + &jobs[idx++]); + off += s; + size -= s; + } + GNUNET_break_op (0 == size); + bs = GNUNET_MIN (bs, + idx); + for (unsigned int i = 0; i<bs; i++) + finish_job (client, + &jobs[i]); + if (failure) + { + struct TALER_CRYPTO_SignFailure sf = { + .header.size = htons (sizeof (sf)), + .header.type = htons (TALER_HELPER_RSA_MT_RES_BATCH_FAILURE), + .ec = htonl (TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE) + }; + + GNUNET_break (0); + return TES_transmit (client->csock, + &sf.header); + } + return GNUNET_OK; +} + + +/** + * Start worker thread for batch processing. + * + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +start_worker (void) +{ + struct Worker *w; + + w = GNUNET_new (struct Worker); + sem_init (&w->sem, + 0); + if (0 != pthread_create (&w->pt, + NULL, + &worker, + w)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, + "pthread_create"); + GNUNET_free (w); + return GNUNET_SYSERR; + } + workers++; + return GNUNET_OK; +} + + +/** + * Stop all worker threads. + */ +static void +stop_workers (void) +{ + while (workers > 0) + { + struct Worker *w; + void *result; + + sem_down (&worker_sem); + GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); + w = worker_head; + GNUNET_CONTAINER_DLL_remove (worker_head, + worker_tail, + w); + GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); + w->do_shutdown = true; + sem_up (&w->sem); + pthread_join (w->pt, + &result); + GNUNET_assert (result == w); + sem_done (&w->sem); + GNUNET_free (w); + workers--; + } +} + + +/** + * Initialize key material for denomination key @a dk (also on disk). + * + * @param[in,out] dk denomination key to compute key material for + * @param position where in the DLL will the @a dk go + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +setup_key (struct DenominationKey *dk, + struct DenominationKey *position) +{ + struct Denomination *denom = dk->denom; + struct GNUNET_CRYPTO_RsaPrivateKey *priv; + struct GNUNET_CRYPTO_RsaPublicKey *pub; + size_t buf_size; + void *buf; + + priv = GNUNET_CRYPTO_rsa_private_key_create (denom->rsa_keysize); + if (NULL == priv) + { + GNUNET_break (0); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + pub = GNUNET_CRYPTO_rsa_private_key_get_public (priv); + if (NULL == pub) + { + GNUNET_break (0); + GNUNET_CRYPTO_rsa_private_key_free (priv); + return GNUNET_SYSERR; + } + buf_size = GNUNET_CRYPTO_rsa_private_key_encode (priv, + &buf); + GNUNET_CRYPTO_rsa_public_key_hash (pub, + &dk->h_rsa.hash); + GNUNET_asprintf (&dk->filename, + "%s/%s/%llu", + keydir, + denom->section, + (unsigned long long) (dk->anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us + )); + if (GNUNET_OK != + GNUNET_DISK_fn_write (dk->filename, + buf, + buf_size, + GNUNET_DISK_PERM_USER_READ)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "write", + dk->filename); + GNUNET_free (buf); + GNUNET_CRYPTO_rsa_private_key_free (priv); + GNUNET_CRYPTO_rsa_public_key_free (pub); + return GNUNET_SYSERR; + } + GNUNET_free (buf); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Setup fresh private key %s at %s in `%s' (generation #%llu)\n", + GNUNET_h2s (&dk->h_rsa.hash), + GNUNET_TIME_timestamp2s (dk->anchor), + dk->filename, + (unsigned long long) key_gen); + dk->denom_priv = priv; + dk->denom_pub = pub; + dk->key_gen = key_gen; + generate_response (dk); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put ( + keys, + &dk->h_rsa.hash, + dk, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Duplicate private key created! Terminating.\n"); + GNUNET_CRYPTO_rsa_private_key_free (dk->denom_priv); + GNUNET_CRYPTO_rsa_public_key_free (dk->denom_pub); + GNUNET_free (dk->filename); + GNUNET_free (dk->an); + GNUNET_free (dk); + return GNUNET_SYSERR; + } + GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, + denom->keys_tail, + position, + dk); + return GNUNET_OK; +} + + +/** + * The withdraw period of a key @a dk has expired. Purge it. + * + * @param[in] dk expired denomination key to purge + */ +static void +purge_key (struct DenominationKey *dk) +{ + if (dk->purge) + return; + if (0 != unlink (dk->filename)) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + dk->filename); + GNUNET_free (dk->filename); + dk->purge = true; + dk->key_gen = key_gen; +} + + +/** + * A @a client informs us that a key has been revoked. + * Check if the key is still in use, and if so replace (!) + * it with a fresh key. + * + * @param client the client making the request + * @param rr the revocation request + */ +static enum GNUNET_GenericReturnValue +handle_revoke_request (struct TES_Client *client, + const struct TALER_CRYPTO_RevokeRequest *rr) +{ + struct DenominationKey *dk; + struct DenominationKey *ndk; + struct Denomination *denom; + + (void) client; + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + dk = GNUNET_CONTAINER_multihashmap_get (keys, + &rr->h_rsa.hash); + if (NULL == dk) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, denomination key %s unknown\n", + GNUNET_h2s (&rr->h_rsa.hash)); + return GNUNET_OK; + } + if (dk->purge) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Revocation request ignored, denomination key %s already revoked\n", + GNUNET_h2s (&rr->h_rsa.hash)); + return GNUNET_OK; + } + + key_gen++; + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Revoking key %s, bumping generation to %llu\n", + GNUNET_h2s (&rr->h_rsa.hash), + (unsigned long long) key_gen); + purge_key (dk); + + /* Setup replacement key */ + denom = dk->denom; + ndk = GNUNET_new (struct DenominationKey); + ndk->denom = denom; + ndk->anchor = dk->anchor; + if (GNUNET_OK != + setup_key (ndk, + dk)) + { + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_break (0); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + TES_wake_clients (); + return GNUNET_OK; +} + + +/** + * Handle @a hdr message received from @a client. + * + * @param client the client that received the message + * @param hdr message that was received + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +rsa_work_dispatch (struct TES_Client *client, + const struct GNUNET_MessageHeader *hdr) +{ + uint16_t msize = ntohs (hdr->size); + + switch (ntohs (hdr->type)) + { + case TALER_HELPER_RSA_MT_REQ_SIGN: + if (msize <= sizeof (struct TALER_CRYPTO_SignRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_sign_request ( + client, + (const struct TALER_CRYPTO_SignRequest *) hdr); + case TALER_HELPER_RSA_MT_REQ_REVOKE: + if (msize != sizeof (struct TALER_CRYPTO_RevokeRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_revoke_request ( + client, + (const struct TALER_CRYPTO_RevokeRequest *) hdr); + case TALER_HELPER_RSA_MT_REQ_BATCH_SIGN: + if (msize <= sizeof (struct TALER_CRYPTO_BatchSignRequest)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + return handle_batch_sign_request ( + client, + (const struct TALER_CRYPTO_BatchSignRequest *) hdr); + default: + GNUNET_break_op (0); + return GNUNET_SYSERR; + } +} + + +/** + * Send our initial key set to @a client together with the + * "sync" terminator. + * + * @param client the client to inform + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +rsa_client_init (struct TES_Client *client) +{ + size_t obs = 0; + char *buf; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Initializing new client %p\n", + client); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *dk = denom->keys_head; + NULL != dk; + dk = dk->next) + { + GNUNET_assert (obs + ntohs (dk->an->header.size) + > obs); + obs += ntohs (dk->an->header.size); + } + } + buf = GNUNET_malloc (obs); + obs = 0; + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *dk = denom->keys_head; + NULL != dk; + dk = dk->next) + { + GNUNET_memcpy (&buf[obs], + dk->an, + ntohs (dk->an->header.size)); + GNUNET_assert (obs + ntohs (dk->an->header.size) + > obs); + obs += ntohs (dk->an->header.size); + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (GNUNET_OK != + TES_transmit_raw (client->csock, + obs, + buf)) + { + GNUNET_free (buf); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Client %p must have disconnected\n", + client); + return GNUNET_SYSERR; + } + GNUNET_free (buf); + { + struct GNUNET_MessageHeader synced = { + .type = htons (TALER_HELPER_RSA_SYNCED), + .size = htons (sizeof (synced)) + }; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Sending RSA SYNCED message to %p\n", + client); + if (GNUNET_OK != + TES_transmit (client->csock, + &synced)) + { + GNUNET_break (0); + return GNUNET_SYSERR; + } + } + return GNUNET_OK; +} + + +/** + * Notify @a client about all changes to the keys since + * the last generation known to the @a client. + * + * @param client the client to notify + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +rsa_update_client_keys (struct TES_Client *client) +{ + size_t obs = 0; + char *buf; + enum GNUNET_GenericReturnValue ret; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *key = denom->keys_head; + NULL != key; + key = key->next) + { + if (key->key_gen <= client->key_gen) + continue; + if (key->purge) + obs += sizeof (struct TALER_CRYPTO_RsaKeyPurgeNotification); + else + obs += ntohs (key->an->header.size); + } + } + if (0 == obs) + { + /* nothing to do */ + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + return GNUNET_OK; + } + buf = GNUNET_malloc (obs); + obs = 0; + for (struct Denomination *denom = denom_head; + NULL != denom; + denom = denom->next) + { + for (struct DenominationKey *key = denom->keys_head; + NULL != key; + key = key->next) + { + if (key->key_gen <= client->key_gen) + continue; + if (key->purge) + { + struct TALER_CRYPTO_RsaKeyPurgeNotification pn = { + .header.type = htons (TALER_HELPER_RSA_MT_PURGE), + .header.size = htons (sizeof (pn)), + .h_rsa = key->h_rsa + }; + + GNUNET_memcpy (&buf[obs], + &pn, + sizeof (pn)); + GNUNET_assert (obs + sizeof (pn) + > obs); + obs += sizeof (pn); + } + else + { + GNUNET_memcpy (&buf[obs], + key->an, + ntohs (key->an->header.size)); + GNUNET_assert (obs + ntohs (key->an->header.size) + > obs); + obs += ntohs (key->an->header.size); + } + } + } + client->key_gen = key_gen; + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + ret = TES_transmit_raw (client->csock, + obs, + buf); + GNUNET_free (buf); + return ret; +} + + +/** + * Create a new denomination key (we do not have enough). + * + * @param denom denomination key to create + * @param now current time to use (to get many keys to use the exact same time) + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +create_key (struct Denomination *denom, + struct GNUNET_TIME_Timestamp now) +{ + struct DenominationKey *dk; + struct GNUNET_TIME_Timestamp anchor; + + anchor = now; + // FIXME: round down to multiple of 'anchor_round' value from configuration + if (NULL != denom->keys_tail) + { + struct GNUNET_TIME_Absolute abs; + + abs = GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, + GNUNET_TIME_relative_subtract ( + denom->duration_withdraw, + overlap_duration)); + if (GNUNET_TIME_absolute_cmp (now.abs_time, <, abs)) + anchor = GNUNET_TIME_absolute_to_timestamp (abs); + } + dk = GNUNET_new (struct DenominationKey); + dk->denom = denom; + dk->anchor = anchor; + if (GNUNET_OK != + setup_key (dk, + denom->keys_tail)) + { + GNUNET_break (0); + GNUNET_free (dk); + GNUNET_SCHEDULER_shutdown (); + globals->global_ret = EXIT_FAILURE; + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * At what time does this denomination require its next action? + * Basically, the minimum of the withdraw expiration time of the + * oldest denomination key, and the withdraw expiration time of + * the newest denomination key minus the #lookahead_sign time. + * + * @param denom denomination to compute action time for + */ +static struct GNUNET_TIME_Absolute +denomination_action_time (const struct Denomination *denom) +{ + struct DenominationKey *head = denom->keys_head; + struct DenominationKey *tail = denom->keys_tail; + struct GNUNET_TIME_Absolute tt; + + if (NULL == head) + return GNUNET_TIME_UNIT_ZERO_ABS; + tt = GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (tail->anchor.abs_time, + denom->duration_withdraw), + lookahead_sign), + overlap_duration); + if (head->rc > 0) + return tt; /* head expiration does not count due to rc > 0 */ + return GNUNET_TIME_absolute_min ( + GNUNET_TIME_absolute_add (head->anchor.abs_time, + denom->duration_withdraw), + tt); +} + + +/** + * Create new keys and expire ancient keys of the given denomination @a denom. + * Removes the @a denom from the #denom_head DLL and re-insert its at the + * correct location sorted by next maintenance activity. + * + * @param[in,out] denom denomination to update material for + * @param now current time to use (to get many keys to use the exact same time) + * @param[in,out] wake set to true if we should wake the clients + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +update_keys (struct Denomination *denom, + struct GNUNET_TIME_Timestamp now, + bool *wake) +{ + /* create new denomination keys */ + if (NULL != denom->keys_tail) + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Updating keys of denomination `%s', last key %s valid for another %s\n", + denom->section, + GNUNET_h2s (&denom->keys_tail->h_rsa.hash), + GNUNET_TIME_relative2s ( + GNUNET_TIME_absolute_get_remaining ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add ( + denom->keys_tail->anchor.abs_time, + denom->duration_withdraw), + overlap_duration)), + GNUNET_YES)); + while ( (NULL == denom->keys_tail) || + GNUNET_TIME_absolute_is_past ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_subtract ( + GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, + denom->duration_withdraw), + lookahead_sign), + overlap_duration)) ) + { + if (! *wake) + { + key_gen++; + *wake = true; + } + if (GNUNET_OK != + create_key (denom, + now)) + { + GNUNET_break (0); + globals->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return GNUNET_SYSERR; + } + } + /* remove expired denomination keys */ + while ( (NULL != denom->keys_head) && + GNUNET_TIME_absolute_is_past + (GNUNET_TIME_absolute_add (denom->keys_head->anchor.abs_time, + denom->duration_withdraw)) ) + { + struct DenominationKey *key = denom->keys_head; + struct DenominationKey *nxt = key->next; + + if (0 != key->rc) + break; /* later */ + GNUNET_CONTAINER_DLL_remove (denom->keys_head, + denom->keys_tail, + key); + GNUNET_assert (GNUNET_OK == + GNUNET_CONTAINER_multihashmap_remove ( + keys, + &key->h_rsa.hash, + key)); + if ( (! key->purge) && + (0 != unlink (key->filename)) ) + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, + "unlink", + key->filename); + GNUNET_free (key->filename); + GNUNET_CRYPTO_rsa_private_key_free (key->denom_priv); + GNUNET_CRYPTO_rsa_public_key_free (key->denom_pub); + GNUNET_free (key->an); + GNUNET_free (key); + key = nxt; + } + + /* Update position of 'denom' in #denom_head DLL: sort by action time */ + { + struct Denomination *before; + struct GNUNET_TIME_Absolute at; + + at = denomination_action_time (denom); + GNUNET_CONTAINER_DLL_remove (denom_head, + denom_tail, + denom); + before = NULL; + for (struct Denomination *pos = denom_head; + NULL != pos; + pos = pos->next) + { + if (GNUNET_TIME_absolute_cmp (denomination_action_time (pos), >=, at)) + break; + before = pos; + } + GNUNET_CONTAINER_DLL_insert_after (denom_head, + denom_tail, + before, + denom); + } + return GNUNET_OK; +} + + +/** + * Task run periodically to expire keys and/or generate fresh ones. + * + * @param cls NULL + */ +static void +update_denominations (void *cls) +{ + struct Denomination *denom; + struct GNUNET_TIME_Absolute now; + struct GNUNET_TIME_Timestamp t; + bool wake = false; + + (void) cls; + keygen_task = NULL; + now = GNUNET_TIME_absolute_get (); + t = GNUNET_TIME_absolute_to_timestamp (now); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Updating denominations ...\n"); + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + do { + denom = denom_head; + if (GNUNET_OK != + update_keys (denom, + t, + &wake)) + return; + } while (denom != denom_head); + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Updating denominations finished ...\n"); + if (wake) + TES_wake_clients (); + keygen_task = GNUNET_SCHEDULER_add_at (denomination_action_time (denom), + &update_denominations, + NULL); +} + + +/** + * Parse private key of denomination @a denom in @a buf. + * + * @param[out] denom denomination of the key + * @param filename name of the file we are parsing, for logging + * @param buf key material + * @param buf_size number of bytes in @a buf + */ +static void +parse_key (struct Denomination *denom, + const char *filename, + const void *buf, + size_t buf_size) +{ + struct GNUNET_CRYPTO_RsaPrivateKey *priv; + char *anchor_s; + char dummy; + unsigned long long anchor_ll; + struct GNUNET_TIME_Timestamp anchor; + + anchor_s = strrchr (filename, + '/'); + if (NULL == anchor_s) + { + /* File in a directory without '/' in the name, this makes no sense. */ + GNUNET_break (0); + return; + } + anchor_s++; + if (1 != sscanf (anchor_s, + "%llu%c", + &anchor_ll, + &dummy)) + { + /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return; + } + anchor.abs_time.abs_value_us + = anchor_ll * GNUNET_TIME_UNIT_SECONDS.rel_value_us; + if (anchor_ll != anchor.abs_time.abs_value_us + / GNUNET_TIME_UNIT_SECONDS.rel_value_us) + { + /* Integer overflow. Bad, invalid filename. */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Filename `%s' invalid for key file, skipping\n", + filename); + return; + } + priv = GNUNET_CRYPTO_rsa_private_key_decode (buf, + buf_size); + if (NULL == priv) + { + /* Parser failure. */ + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "File `%s' is malformed, skipping\n", + filename); + return; + } + + { + struct GNUNET_CRYPTO_RsaPublicKey *pub; + struct DenominationKey *dk; + struct DenominationKey *before; + + pub = GNUNET_CRYPTO_rsa_private_key_get_public (priv); + if (NULL == pub) + { + GNUNET_break (0); + GNUNET_CRYPTO_rsa_private_key_free (priv); + return; + } + dk = GNUNET_new (struct DenominationKey); + dk->denom_priv = priv; + dk->denom = denom; + dk->anchor = anchor; + dk->filename = GNUNET_strdup (filename); + GNUNET_CRYPTO_rsa_public_key_hash (pub, + &dk->h_rsa.hash); + dk->denom_pub = pub; + generate_response (dk); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put ( + keys, + &dk->h_rsa.hash, + dk, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Duplicate private key %s detected in file `%s'. Skipping.\n", + GNUNET_h2s (&dk->h_rsa.hash), + filename); + GNUNET_CRYPTO_rsa_private_key_free (priv); + GNUNET_CRYPTO_rsa_public_key_free (pub); + GNUNET_free (dk->an); + GNUNET_free (dk); + return; + } + before = NULL; + for (struct DenominationKey *pos = denom->keys_head; + NULL != pos; + pos = pos->next) + { + if (GNUNET_TIME_timestamp_cmp (pos->anchor, + >, + anchor)) + break; + before = pos; + } + GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, + denom->keys_tail, + before, + dk); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Imported key %s from `%s'\n", + GNUNET_h2s (&dk->h_rsa.hash), + filename); + } +} + + +/** + * Import a private key from @a filename for the denomination + * given in @a cls. + * + * @param[in,out] cls a `struct Denomiantion` + * @param filename name of a file in the directory + * @return #GNUNET_OK (always, continue to iterate) + */ +static enum GNUNET_GenericReturnValue +import_key (void *cls, + const char *filename) +{ + struct Denomination *denom = cls; + struct GNUNET_DISK_FileHandle *fh; + struct GNUNET_DISK_MapHandle *map; + void *ptr; + int fd; + struct stat sbuf; + + { + struct stat lsbuf; + + if (0 != lstat (filename, + &lsbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "lstat", + filename); + return GNUNET_OK; + } + if (! S_ISREG (lsbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + return GNUNET_OK; + } + } + + fd = open (filename, + O_RDONLY | O_CLOEXEC); + if (-1 == fd) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + return GNUNET_OK; + } + if (0 != fstat (fd, + &sbuf)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "stat", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (! S_ISREG (sbuf.st_mode)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' is not a regular file, which is not allowed for private keys!\n", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) + { + /* permission are NOT tight, try to patch them up! */ + if (0 != + fchmod (fd, + S_IRUSR)) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "fchmod", + filename); + /* refuse to use key if file has wrong permissions */ + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + } + fh = GNUNET_DISK_get_handle_from_int_fd (fd); + if (NULL == fh) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "open", + filename); + GNUNET_break (0 == close (fd)); + return GNUNET_OK; + } + if (sbuf.st_size > 16 * 1024) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "File `%s' too big to be a private key\n", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + ptr = GNUNET_DISK_file_map (fh, + &map, + GNUNET_DISK_MAP_TYPE_READ, + (size_t) sbuf.st_size); + if (NULL == ptr) + { + GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, + "mmap", + filename); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; + } + parse_key (denom, + filename, + ptr, + (size_t) sbuf.st_size); + GNUNET_DISK_file_unmap (map); + GNUNET_DISK_file_close (fh); + return GNUNET_OK; +} + + +/** + * Parse configuration for denomination type parameters. Also determines + * our anchor by looking at the existing denominations of the same type. + * + * @param cfg configuration to use + * @param ct section in the configuration file giving the denomination type parameters + * @param[out] denom set to the denomination parameters from the configuration + * @return #GNUNET_OK on success, #GNUNET_SYSERR if the configuration is invalid + */ +static enum GNUNET_GenericReturnValue +parse_denomination_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg, + const char *ct, + struct Denomination *denom) +{ + unsigned long long rsa_keysize; + char *secname; + + GNUNET_asprintf (&secname, + "%s-secmod-rsa", + globals->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + ct, + "DURATION_WITHDRAW", + &denom->duration_withdraw)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + ct, + "DURATION_WITHDRAW"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if (GNUNET_TIME_relative_cmp (overlap_duration, + >=, + denom->duration_withdraw)) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + secname, + "OVERLAP_DURATION", + "Value given must be smaller than value for DURATION_WITHDRAW!"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (cfg, + ct, + "RSA_KEYSIZE", + &rsa_keysize)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + ct, + "RSA_KEYSIZE"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if ( (rsa_keysize > 4 * 2048) || + (rsa_keysize < 1024) ) + { + GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, + ct, + "RSA_KEYSIZE", + "Given RSA keysize outside of permitted range [1024,8192]\n"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + GNUNET_free (secname); + denom->rsa_keysize = (unsigned int) rsa_keysize; + denom->section = GNUNET_strdup (ct); + return GNUNET_OK; +} + + +/** + * Closure for #load_denominations. + */ +struct LoadContext +{ + + /** + * Configuration to use. + */ + const struct GNUNET_CONFIGURATION_Handle *cfg; + + /** + * Current time to use. + */ + struct GNUNET_TIME_Timestamp t; + + /** + * Status, to be set to #GNUNET_SYSERR on failure + */ + enum GNUNET_GenericReturnValue ret; +}; + + +/** + * Generate new denomination signing keys for the denomination type of the given @a + * denomination_alias. + * + * @param cls a `struct LoadContext`, with 'ret' to be set to #GNUNET_SYSERR on failure + * @param denomination_alias name of the denomination's section in the configuration + */ +static void +load_denominations (void *cls, + const char *denomination_alias) +{ + struct LoadContext *ctx = cls; + struct Denomination *denom; + bool wake = true; + char *cipher; + + if ( (0 != strncasecmp (denomination_alias, + "coin_", + strlen ("coin_"))) && + (0 != strncasecmp (denomination_alias, + "coin-", + strlen ("coin-"))) ) + return; /* not a denomination type definition */ + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_string (ctx->cfg, + denomination_alias, + "CIPHER", + &cipher)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + denomination_alias, + "CIPHER"); + return; + } + if (0 != strcmp (cipher, "RSA")) + { + GNUNET_free (cipher); + return; /* Ignore denominations of other types than CS */ + } + GNUNET_free (cipher); + denom = GNUNET_new (struct Denomination); + if (GNUNET_OK != + parse_denomination_cfg (ctx->cfg, + denomination_alias, + denom)) + { + ctx->ret = GNUNET_SYSERR; + GNUNET_free (denom); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Loading keys for denomination %s\n", + denom->section); + { + char *dname; + + GNUNET_asprintf (&dname, + "%s/%s", + keydir, + denom->section); + GNUNET_break (GNUNET_OK == + GNUNET_DISK_directory_create (dname)); + GNUNET_DISK_directory_scan (dname, + &import_key, + denom); + GNUNET_free (dname); + } + GNUNET_CONTAINER_DLL_insert (denom_head, + denom_tail, + denom); + update_keys (denom, + ctx->t, + &wake); +} + + +/** + * Load the various duration values from @a cfg + * + * @param cfg configuration to use + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + char *secname; + + GNUNET_asprintf (&secname, + "%s-secmod-rsa", + globals->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "OVERLAP_DURATION", + &overlap_duration)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "OVERLAP_DURATION"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (cfg, + secname, + "LOOKAHEAD_SIGN", + &lookahead_sign)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "LOOKAHEAD_SIGN"); + GNUNET_free (secname); + return GNUNET_SYSERR; + } + GNUNET_free (secname); + return GNUNET_OK; +} + + +/** + * Function run on shutdown. Stops the various jobs (nicely). + * + * @param cls NULL + */ +static void +do_shutdown (void *cls) +{ + (void) cls; + TES_listen_stop (); + if (NULL != keygen_task) + { + GNUNET_SCHEDULER_cancel (keygen_task); + keygen_task = NULL; + } + stop_workers (); + sem_done (&worker_sem); +} + + +/** + * Main function that will be run under the GNUnet scheduler. + * + * @param cls closure + * @param args remaining command-line arguments + * @param cfgfile name of the configuration file used (for saving, can be NULL!) + * @param cfg configuration + */ +void +TALER_SECMOD_rsa_run (void *cls, + char *const *args, + const char *cfgfile, + const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + static struct TES_Callbacks cb = { + .dispatch = rsa_work_dispatch, + .updater = rsa_update_client_keys, + .init = rsa_client_init + }; + struct TALER_SECMOD_Options *opt = cls; + char *secname; + + (void) args; + (void) cfgfile; + globals = opt; + if (GNUNET_TIME_timestamp_cmp (opt->global_now, + !=, + opt->global_now_tmp)) + { + /* The user gave "--now", use it! */ + opt->global_now = opt->global_now_tmp; + } + else + { + /* get current time again, we may be timetraveling! */ + opt->global_now = GNUNET_TIME_timestamp_get (); + } + GNUNET_asprintf (&secname, + "%s-secmod-rsa", + opt->section); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_filename (cfg, + secname, + "KEY_DIR", + &keydir)) + { + GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, + secname, + "KEY_DIR"); + GNUNET_free (secname); + opt->global_ret = EXIT_NOTCONFIGURED; + return; + } + if (GNUNET_OK != + load_durations (cfg)) + { + opt->global_ret = EXIT_NOTCONFIGURED; + GNUNET_free (secname); + return; + } + GNUNET_asprintf (&secname, + "%s-secmod-rsa", + opt->section); + opt->global_ret = TES_listen_start (cfg, + secname, + &cb); + GNUNET_free (secname); + if (0 != opt->global_ret) + return; + sem_init (&worker_sem, + 0); + GNUNET_SCHEDULER_add_shutdown (&do_shutdown, + NULL); + if (0 == opt->max_workers) + { + long lret; + + lret = sysconf (_SC_NPROCESSORS_CONF); + if (lret <= 0) + lret = 1; + opt->max_workers = (unsigned int) lret; + } + + for (unsigned int i = 0; i<opt->max_workers; i++) + if (GNUNET_OK != + start_worker ()) + { + GNUNET_SCHEDULER_shutdown (); + return; + } + /* Load denominations */ + keys = GNUNET_CONTAINER_multihashmap_create (65536, + true); + { + struct LoadContext lc = { + .cfg = cfg, + .ret = GNUNET_OK, + .t = opt->global_now + }; + + GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); + GNUNET_CONFIGURATION_iterate_sections (cfg, + &load_denominations, + &lc); + GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); + if (GNUNET_OK != lc.ret) + { + opt->global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + } + } + if (NULL == denom_head) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "No RSA denominations configured\n"); + TES_wake_clients (); + return; + } + /* start job to keep keys up-to-date; MUST be run before the #listen_task, + hence with priority. */ + keygen_task = GNUNET_SCHEDULER_add_with_priority ( + GNUNET_SCHEDULER_PRIORITY_URGENT, + &update_denominations, + NULL); +} diff --git a/src/util/taler-exchange-secmod-cs.c b/src/util/taler-exchange-secmod-cs.c index a2308507e..e27240e7a 100644 --- a/src/util/taler-exchange-secmod-cs.c +++ b/src/util/taler-exchange-secmod-cs.c @@ -1,6 +1,6 @@ /* This file is part of TALER - Copyright (C) 2014-2022 Taler Systems SA + Copyright (C) 2014-2024 Taler Systems SA TALER is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -33,2257 +33,6 @@ */ #include "platform.h" #include "taler_util.h" -#include "taler-exchange-secmod-cs.h" -#include <gcrypt.h> -#include <pthread.h> -#include <sys/eventfd.h> -#include "taler_error_codes.h" -#include "taler_signatures.h" -#include "secmod_common.h" -#include <poll.h> - - -/** - * Information we keep per denomination. - */ -struct Denomination; - - -/** - * One particular denomination key. - */ -struct DenominationKey -{ - - /** - * Kept in a DLL of the respective denomination. Sorted by anchor time. - */ - struct DenominationKey *next; - - /** - * Kept in a DLL of the respective denomination. Sorted by anchor time. - */ - struct DenominationKey *prev; - - /** - * Denomination this key belongs to. - */ - struct Denomination *denom; - - /** - * Name of the file this key is stored under. - */ - char *filename; - - /** - * The private key of the denomination. - */ - struct GNUNET_CRYPTO_CsPrivateKey denom_priv; - - /** - * The public key of the denomination. - */ - struct GNUNET_CRYPTO_CsPublicKey denom_pub; - - /** - * Message to transmit to clients to introduce this public key. - */ - struct TALER_CRYPTO_CsKeyAvailableNotification *an; - - /** - * Hash of this denomination's public key. - */ - struct TALER_CsPubHashP h_cs; - - /** - * Time at which this key is supposed to become valid. - */ - struct GNUNET_TIME_Timestamp anchor; - - /** - * Generation when this key was created or revoked. - */ - uint64_t key_gen; - - /** - * Reference counter. Counts the number of threads that are - * using this key at this time. - */ - unsigned int rc; - - /** - * Flag set to true if this key has been purged and the memory - * must be freed as soon as @e rc hits zero. - */ - bool purge; - -}; - - -struct Denomination -{ - - /** - * Kept in a DLL. Sorted by #denomination_action_time(). - */ - struct Denomination *next; - - /** - * Kept in a DLL. Sorted by #denomination_action_time(). - */ - struct Denomination *prev; - - /** - * Head of DLL of actual keys of this denomination. - */ - struct DenominationKey *keys_head; - - /** - * Tail of DLL of actual keys of this denomination. - */ - struct DenominationKey *keys_tail; - - /** - * How long can coins be withdrawn (generated)? Should be small - * enough to limit how many coins will be signed into existence with - * the same key, but large enough to still provide a reasonable - * anonymity set. - */ - struct GNUNET_TIME_Relative duration_withdraw; - - /** - * What is the configuration section of this denomination type? Also used - * for the directory name where the denomination keys are stored. - */ - char *section; - -}; - - -/** - * A semaphore. - */ -struct Semaphore -{ - /** - * Mutex for the semaphore. - */ - pthread_mutex_t mutex; - - /** - * Condition variable for the semaphore. - */ - pthread_cond_t cv; - - /** - * Counter of the semaphore. - */ - unsigned int ctr; -}; - - -/** - * Job in a batch sign request. - */ -struct BatchJob; - -/** - * Handle for a thread that does work in batch signing. - */ -struct Worker -{ - /** - * Kept in a DLL. - */ - struct Worker *prev; - - /** - * Kept in a DLL. - */ - struct Worker *next; - - /** - * Job this worker should do next. - */ - struct BatchJob *job; - - /** - * Semaphore to signal the worker that a job is available. - */ - struct Semaphore sem; - - /** - * Handle for this thread. - */ - pthread_t pt; - - /** - * Set to true if the worker should terminate. - */ - bool do_shutdown; -}; - - -/** - * Job in a batch sign request. - */ -struct BatchJob -{ - - /** - * Thread doing the work. - */ - struct Worker *worker; - - /** - * Semaphore to signal that the job is finished. - */ - struct Semaphore sem; - - /** - * Computation status. - */ - enum TALER_ErrorCode ec; - - /** - * Which type of request is this? - */ - enum { TYPE_SIGN, TYPE_RDERIVE } type; - - /** - * Details depending on @e type. - */ - union - { - - /** - * Details if @e type is TYPE_SIGN. - */ - struct - { - /** - * Request we are working on. - */ - const struct TALER_CRYPTO_CsSignRequestMessage *sr; - - /** - * Result with the signature. - */ - struct GNUNET_CRYPTO_CsBlindSignature cs_answer; - } sign; - - /** - * Details if type is TYPE_RDERIVE. - */ - struct - { - /** - * Request we are answering. - */ - const struct TALER_CRYPTO_CsRDeriveRequest *rdr; - - /** - * Pair of points to return. - */ - struct GNUNET_CRYPTO_CSPublicRPairP rpairp; - - } rderive; - - } details; - -}; - -/** - * Head of DLL of workers ready for more work. - */ -static struct Worker *worker_head; - -/** - * Tail of DLL of workers ready for more work. - */ -static struct Worker *worker_tail; - -/** - * Lock for manipulating the worker DLL. - */ -static pthread_mutex_t worker_lock; - -/** - * Total number of workers that were started. - */ -static unsigned int workers; - -/** - * Semaphore used to grab a worker. - */ -static struct Semaphore worker_sem; - -/** - * Return value from main(). - */ -static int global_ret; - -/** - * Time when the key update is executed. - * Either the actual current time, or a pretended time. - */ -static struct GNUNET_TIME_Timestamp global_now; - -/** - * The time for the key update, as passed by the user - * on the command line. - */ -static struct GNUNET_TIME_Timestamp global_now_tmp; - -/** - * Where do we store the keys? - */ -static char *keydir; - -/** - * Name of the configuration section prefix to use. Usually either "taler-exchange" or - * "donau". The actual configuration section will then be - * "$SECTION-secmod-cs". - */ -static char *section; - -/** - * How much should coin creation (@e duration_withdraw) duration overlap - * with the next denomination? Basically, the starting time of two - * denominations is always @e duration_withdraw - #overlap_duration apart. - */ -static struct GNUNET_TIME_Relative overlap_duration; - -/** - * How long into the future do we pre-generate keys? - */ -static struct GNUNET_TIME_Relative lookahead_sign; - -/** - * All of our denominations, in a DLL. Sorted? - */ -static struct Denomination *denom_head; - -/** - * All of our denominations, in a DLL. Sorted? - */ -static struct Denomination *denom_tail; - -/** - * Map of hashes of public (CS) keys to `struct DenominationKey *` - * with the respective private keys. - */ -static struct GNUNET_CONTAINER_MultiHashMap *keys; - -/** - * Task run to generate new keys. - */ -static struct GNUNET_SCHEDULER_Task *keygen_task; - -/** - * Lock for the keys queue. - */ -static pthread_mutex_t keys_lock; - -/** - * Current key generation. - */ -static uint64_t key_gen; - -/** - * Number of workers to launch. Note that connections to - * exchanges are NOT workers. - */ -static unsigned int max_workers = 16; - - -/** - * Generate the announcement message for @a dk. - * - * @param[in,out] dk denomination key to generate the announcement for - */ -static void -generate_response (struct DenominationKey *dk) -{ - struct Denomination *denom = dk->denom; - size_t nlen = strlen (denom->section) + 1; - struct TALER_CRYPTO_CsKeyAvailableNotification *an; - void *p; - size_t tlen; - - GNUNET_assert (sizeof(dk->denom_pub) < UINT16_MAX); - GNUNET_assert (nlen < UINT16_MAX); - tlen = nlen + sizeof (*an); - GNUNET_assert (tlen < UINT16_MAX); - an = GNUNET_malloc (tlen); - an->header.size = htons ((uint16_t) tlen); - an->header.type = htons (TALER_HELPER_CS_MT_AVAIL); - an->section_name_len = htons ((uint16_t) nlen); - an->anchor_time = GNUNET_TIME_timestamp_hton (dk->anchor); - an->duration_withdraw = GNUNET_TIME_relative_hton (denom->duration_withdraw); - an->denom_pub = dk->denom_pub; - TALER_exchange_secmod_cs_sign (&dk->h_cs, - denom->section, - dk->anchor, - denom->duration_withdraw, - &TES_smpriv, - &an->secm_sig); - an->secm_pub = TES_smpub; - p = (void *) &an[1]; - GNUNET_memcpy (p, - denom->section, - nlen); - dk->an = an; -} - - -/** - * Do the actual signing work. - * - * @param h_cs hash of key to sign with - * @param planchet message to sign - * @param for_melt true if for melting - * @param[out] cs_sigp set to the CS signature - * @return #TALER_EC_NONE on success - */ -static enum TALER_ErrorCode -do_sign (const struct TALER_CsPubHashP *h_cs, - const struct GNUNET_CRYPTO_CsBlindedMessage *planchet, - bool for_melt, - struct GNUNET_CRYPTO_CsBlindSignature *cs_sigp) -{ - struct GNUNET_CRYPTO_CsRSecret r[2]; - struct DenominationKey *dk; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - dk = GNUNET_CONTAINER_multihashmap_get (keys, - &h_cs->hash); - if (NULL == dk) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Signing request failed, denomination key %s unknown\n", - GNUNET_h2s (&h_cs->hash)); - return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; - } - if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Signing request failed, denomination key %s is not yet valid\n", - GNUNET_h2s (&h_cs->hash)); - return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Received request to sign over bytes with key %s\n", - GNUNET_h2s (&h_cs->hash)); - GNUNET_assert (dk->rc < UINT_MAX); - dk->rc++; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_CRYPTO_cs_r_derive (&planchet->nonce, - for_melt ? "rm" : "rw", - &dk->denom_priv, - r); - GNUNET_CRYPTO_cs_sign_derive (&dk->denom_priv, - r, - planchet, - cs_sigp); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_assert (dk->rc > 0); - dk->rc--; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return TALER_EC_NONE; -} - - -/** - * Generate error response that signing failed. - * - * @param client client to send response to - * @param ec error code to include - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -fail_sign (struct TES_Client *client, - enum TALER_ErrorCode ec) -{ - struct TALER_CRYPTO_SignFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_CS_MT_RES_SIGN_FAILURE), - .ec = htonl (ec) - }; - - return TES_transmit (client->csock, - &sf.header); -} - - -/** - * Generate error response that deriving failed. - * - * @param client client to send response to - * @param ec error code to include - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -fail_derive (struct TES_Client *client, - enum TALER_ErrorCode ec) -{ - struct TALER_CRYPTO_RDeriveFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE_FAILURE), - .ec = htonl (ec) - }; - - return TES_transmit (client->csock, - &sf.header); -} - - -/** - * Generate signature response. - * - * @param client client to send response to - * @param cs_answer signature to send - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -send_signature (struct TES_Client *client, - const struct GNUNET_CRYPTO_CsBlindSignature *cs_answer) -{ - struct TALER_CRYPTO_SignResponse sres; - - sres.header.size = htons (sizeof (sres)); - sres.header.type = htons (TALER_HELPER_CS_MT_RES_SIGNATURE); - sres.b = htonl (cs_answer->b); - sres.cs_answer = cs_answer->s_scalar; - return TES_transmit (client->csock, - &sres.header); -} - - -/** - * Handle @a client request @a sr to create signature. Create the - * signature using the respective key and return the result to - * the client. - * - * @param client the client making the request - * @param sr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_sign_request (struct TES_Client *client, - const struct TALER_CRYPTO_CsSignRequestMessage *sr) -{ - struct GNUNET_CRYPTO_CsBlindSignature cs_answer; - struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); - enum TALER_ErrorCode ec; - enum GNUNET_GenericReturnValue ret; - - ec = do_sign (&sr->h_cs, - &sr->message, - (0 != ntohl (sr->for_melt)), - &cs_answer); - if (TALER_EC_NONE != ec) - { - return fail_sign (client, - ec); - } - ret = send_signature (client, - &cs_answer); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Sent CS signature after %s\n", - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_duration (now), - GNUNET_YES)); - return ret; -} - - -/** - * Do the actual deriving work. - * - * @param h_cs key to sign with - * @param nonce nonce to derive from - * @param for_melt true if for melting - * @param[out] rpairp set to the derived values - * @return #TALER_EC_NONE on success - */ -static enum TALER_ErrorCode -do_derive (const struct TALER_CsPubHashP *h_cs, - const struct GNUNET_CRYPTO_CsSessionNonce *nonce, - bool for_melt, - struct GNUNET_CRYPTO_CSPublicRPairP *rpairp) -{ - struct DenominationKey *dk; - struct GNUNET_CRYPTO_CSPrivateRPairP r_priv; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - dk = GNUNET_CONTAINER_multihashmap_get (keys, - &h_cs->hash); - if (NULL == dk) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "R Derive request failed, denomination key %s unknown\n", - GNUNET_h2s (&h_cs->hash)); - return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; - } - if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "R Derive request failed, denomination key %s is not yet valid\n", - GNUNET_h2s (&h_cs->hash)); - return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Received request to derive R with key %s\n", - GNUNET_h2s (&h_cs->hash)); - GNUNET_assert (dk->rc < UINT_MAX); - dk->rc++; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_CRYPTO_cs_r_derive (nonce, - for_melt ? "rm" : "rw", - &dk->denom_priv, - r_priv.r); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_assert (dk->rc > 0); - dk->rc--; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[0], - &rpairp->r_pub[0]); - GNUNET_CRYPTO_cs_r_get_public (&r_priv.r[1], - &rpairp->r_pub[1]); - return TALER_EC_NONE; -} - - -/** - * Generate derivation response. - * - * @param client client to send response to - * @param r_pub public point value pair to send - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -send_derivation (struct TES_Client *client, - const struct GNUNET_CRYPTO_CSPublicRPairP *r_pub) -{ - struct TALER_CRYPTO_RDeriveResponse rdr = { - .header.size = htons (sizeof (rdr)), - .header.type = htons (TALER_HELPER_CS_MT_RES_RDERIVE), - .r_pub = *r_pub - }; - - return TES_transmit (client->csock, - &rdr.header); -} - - -/** - * Initialize a semaphore @a sem with a value of @a val. - * - * @param[out] sem semaphore to initialize - * @param val initial value of the semaphore - */ -static void -sem_init (struct Semaphore *sem, - unsigned int val) -{ - GNUNET_assert (0 == - pthread_mutex_init (&sem->mutex, - NULL)); - GNUNET_assert (0 == - pthread_cond_init (&sem->cv, - NULL)); - sem->ctr = val; -} - - -/** - * Decrement semaphore, blocks until this is possible. - * - * @param[in,out] sem semaphore to decrement - */ -static void -sem_down (struct Semaphore *sem) -{ - GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); - while (0 == sem->ctr) - { - pthread_cond_wait (&sem->cv, - &sem->mutex); - } - sem->ctr--; - GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); -} - - -/** - * Increment semaphore, blocks until this is possible. - * - * @param[in,out] sem semaphore to decrement - */ -static void -sem_up (struct Semaphore *sem) -{ - GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); - sem->ctr++; - GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); - pthread_cond_signal (&sem->cv); -} - - -/** - * Release resources used by @a sem. - * - * @param[in] sem semaphore to release (except the memory itself) - */ -static void -sem_done (struct Semaphore *sem) -{ - GNUNET_break (0 == pthread_cond_destroy (&sem->cv)); - GNUNET_break (0 == pthread_mutex_destroy (&sem->mutex)); -} - - -/** - * Main logic of a worker thread. Grabs work, does it, - * grabs more work. - * - * @param cls a `struct Worker *` - * @returns cls - */ -static void * -worker (void *cls) -{ - struct Worker *w = cls; - - while (true) - { - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - GNUNET_CONTAINER_DLL_insert (worker_head, - worker_tail, - w); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - sem_up (&worker_sem); - sem_down (&w->sem); - if (w->do_shutdown) - break; - { - struct BatchJob *bj = w->job; - - switch (bj->type) - { - case TYPE_SIGN: - { - const struct TALER_CRYPTO_CsSignRequestMessage *sr - = bj->details.sign.sr; - - bj->ec = do_sign (&sr->h_cs, - &sr->message, - (0 != ntohl (sr->for_melt)), - &bj->details.sign.cs_answer); - break; - } - case TYPE_RDERIVE: - { - const struct TALER_CRYPTO_CsRDeriveRequest *rdr - = bj->details.rderive.rdr; - bj->ec = do_derive (&rdr->h_cs, - &rdr->nonce, - (0 != ntohl (rdr->for_melt)), - &bj->details.rderive.rpairp); - break; - } - } - sem_up (&bj->sem); - w->job = NULL; - } - } - return w; -} - - -/** - * Start batch job @a bj to sign @a sr. - * - * @param sr signature request to answer - * @param[out] bj job data structure - */ -static void -start_sign_job (const struct TALER_CRYPTO_CsSignRequestMessage *sr, - struct BatchJob *bj) -{ - sem_init (&bj->sem, - 0); - bj->type = TYPE_SIGN; - bj->details.sign.sr = sr; - sem_down (&worker_sem); - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - bj->worker = worker_head; - GNUNET_CONTAINER_DLL_remove (worker_head, - worker_tail, - bj->worker); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - bj->worker->job = bj; - sem_up (&bj->worker->sem); -} - - -/** - * Start batch job @a bj to derive @a rdr. - * - * @param rdr derivation request to answer - * @param[out] bj job data structure - */ -static void -start_derive_job (const struct TALER_CRYPTO_CsRDeriveRequest *rdr, - struct BatchJob *bj) -{ - sem_init (&bj->sem, - 0); - bj->type = TYPE_RDERIVE; - bj->details.rderive.rdr = rdr; - sem_down (&worker_sem); - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - bj->worker = worker_head; - GNUNET_CONTAINER_DLL_remove (worker_head, - worker_tail, - bj->worker); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - bj->worker->job = bj; - sem_up (&bj->worker->sem); -} - - -/** - * Finish a job @a bj for a @a client. - * - * @param client who made the request - * @param[in,out] bj job to finish - */ -static void -finish_job (struct TES_Client *client, - struct BatchJob *bj) -{ - sem_down (&bj->sem); - sem_done (&bj->sem); - switch (bj->type) - { - case TYPE_SIGN: - if (TALER_EC_NONE != bj->ec) - { - fail_sign (client, - bj->ec); - return; - } - send_signature (client, - &bj->details.sign.cs_answer); - break; - case TYPE_RDERIVE: - if (TALER_EC_NONE != bj->ec) - { - fail_derive (client, - bj->ec); - return; - } - send_derivation (client, - &bj->details.rderive.rpairp); - break; - } -} - - -/** - * Handle @a client request @a sr to create a batch of signature. Creates the - * signatures using the respective key and return the results to the client. - * - * @param client the client making the request - * @param bsr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_batch_sign_request (struct TES_Client *client, - const struct TALER_CRYPTO_BatchSignRequest *bsr) -{ - uint32_t bs = ntohl (bsr->batch_size); - uint16_t size = ntohs (bsr->header.size) - sizeof (*bsr); - const void *off = (const void *) &bsr[1]; - unsigned int idx = 0; - struct BatchJob jobs[GNUNET_NZL (bs)]; - bool failure = false; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Handling batch sign request of size %u\n", - (unsigned int) bs); - if (bs > TALER_MAX_FRESH_COINS) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - while ( (bs > 0) && - (size >= sizeof (struct TALER_CRYPTO_CsSignRequestMessage)) ) - { - const struct TALER_CRYPTO_CsSignRequestMessage *sr = off; - uint16_t s = ntohs (sr->header.size); - - if (s > size) - { - failure = true; - bs = idx; - break; - } - start_sign_job (sr, - &jobs[idx++]); - off += s; - size -= s; - } - GNUNET_break_op (0 == size); - bs = GNUNET_MIN (bs, - idx); - for (unsigned int i = 0; i<bs; i++) - finish_job (client, - &jobs[i]); - if (failure) - { - struct TALER_CRYPTO_SignFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_CS_MT_RES_BATCH_SIGN_FAILURE), - .ec = htonl (TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE) - }; - - GNUNET_break (0); - return TES_transmit (client->csock, - &sf.header); - } - return GNUNET_OK; -} - - -/** - * Handle @a client request @a sr to create a batch of derivations. Creates the - * derivations using the respective key and return the results to the client. - * - * @param client the client making the request - * @param bdr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_batch_derive_request (struct TES_Client *client, - const struct TALER_CRYPTO_BatchDeriveRequest *bdr) -{ - uint32_t bs = ntohl (bdr->batch_size); - uint16_t size = ntohs (bdr->header.size) - sizeof (*bdr); - const void *off = (const void *) &bdr[1]; - unsigned int idx = 0; - struct BatchJob jobs[bs]; - bool failure = false; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Handling batch derivation request of size %u\n", - (unsigned int) bs); - if (bs > TALER_MAX_FRESH_COINS) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - while ( (bs > 0) && - (size >= sizeof (struct TALER_CRYPTO_CsRDeriveRequest)) ) - { - const struct TALER_CRYPTO_CsRDeriveRequest *rdr = off; - uint16_t s = ntohs (rdr->header.size); - - if ( (s > size) || - (s != sizeof (*rdr)) ) - { - failure = true; - bs = idx; - break; - } - start_derive_job (rdr, - &jobs[idx++]); - off += s; - size -= s; - } - GNUNET_break_op (0 == size); - bs = GNUNET_MIN (bs, - idx); - for (unsigned int i = 0; i<bs; i++) - finish_job (client, - &jobs[i]); - if (failure) - { - GNUNET_break (0); - return fail_derive (client, - TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE); - } - return GNUNET_OK; -} - - -/** - * Start worker thread for batch processing. - * - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -start_worker (void) -{ - struct Worker *w; - - w = GNUNET_new (struct Worker); - sem_init (&w->sem, - 0); - if (0 != pthread_create (&w->pt, - NULL, - &worker, - w)) - { - GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, - "pthread_create"); - GNUNET_free (w); - return GNUNET_SYSERR; - } - workers++; - return GNUNET_OK; -} - - -/** - * Stop all worker threads. - */ -static void -stop_workers (void) -{ - while (workers > 0) - { - struct Worker *w; - void *result; - - sem_down (&worker_sem); - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - w = worker_head; - GNUNET_CONTAINER_DLL_remove (worker_head, - worker_tail, - w); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - w->do_shutdown = true; - sem_up (&w->sem); - pthread_join (w->pt, - &result); - GNUNET_assert (result == w); - sem_done (&w->sem); - GNUNET_free (w); - workers--; - } -} - - -/** - * Initialize key material for denomination key @a dk (also on disk). - * - * @param[in,out] dk denomination key to compute key material for - * @param position where in the DLL will the @a dk go - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -setup_key (struct DenominationKey *dk, - struct DenominationKey *position) -{ - struct Denomination *denom = dk->denom; - struct GNUNET_CRYPTO_CsPrivateKey priv; - struct GNUNET_CRYPTO_CsPublicKey pub; - - GNUNET_CRYPTO_cs_private_key_generate (&priv); - GNUNET_CRYPTO_cs_private_key_get_public (&priv, - &pub); - GNUNET_CRYPTO_hash (&pub, - sizeof (pub), - &dk->h_cs.hash); - GNUNET_asprintf (&dk->filename, - "%s/%s/%llu", - keydir, - denom->section, - (unsigned long long) (dk->anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us - )); - if (GNUNET_OK != - GNUNET_DISK_fn_write (dk->filename, - &priv, - sizeof(priv), - GNUNET_DISK_PERM_USER_READ)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "write", - dk->filename); - return GNUNET_SYSERR; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Setup fresh private key %s at %s in `%s' (generation #%llu)\n", - GNUNET_h2s (&dk->h_cs.hash), - GNUNET_TIME_timestamp2s (dk->anchor), - dk->filename, - (unsigned long long) key_gen); - dk->denom_priv = priv; - dk->denom_pub = pub; - dk->key_gen = key_gen; - generate_response (dk); - if (GNUNET_OK != - GNUNET_CONTAINER_multihashmap_put ( - keys, - &dk->h_cs.hash, - dk, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Duplicate private key created! Terminating.\n"); - GNUNET_free (dk->filename); - GNUNET_free (dk->an); - GNUNET_free (dk); - return GNUNET_SYSERR; - } - GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, - denom->keys_tail, - position, - dk); - return GNUNET_OK; -} - - -/** - * The withdraw period of a key @a dk has expired. Purge it. - * - * @param[in] dk expired denomination key to purge - */ -static void -purge_key (struct DenominationKey *dk) -{ - if (dk->purge) - return; - if (0 != unlink (dk->filename)) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - dk->filename); - GNUNET_free (dk->filename); - dk->purge = true; - dk->key_gen = key_gen; -} - - -/** - * A @a client informs us that a key has been revoked. - * Check if the key is still in use, and if so replace (!) - * it with a fresh key. - * - * @param client the client making the request - * @param rr the revocation request - */ -static enum GNUNET_GenericReturnValue -handle_revoke_request (struct TES_Client *client, - const struct TALER_CRYPTO_CsRevokeRequest *rr) -{ - struct DenominationKey *dk; - struct DenominationKey *ndk; - struct Denomination *denom; - - (void) client; - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - dk = GNUNET_CONTAINER_multihashmap_get (keys, - &rr->h_cs.hash); - if (NULL == dk) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, denomination key %s unknown\n", - GNUNET_h2s (&rr->h_cs.hash)); - return GNUNET_OK; - } - if (dk->purge) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, denomination key %s already revoked\n", - GNUNET_h2s (&rr->h_cs.hash)); - return GNUNET_OK; - } - - key_gen++; - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Revoking key %s, bumping generation to %llu\n", - GNUNET_h2s (&rr->h_cs.hash), - (unsigned long long) key_gen); - purge_key (dk); - - /* Setup replacement key */ - denom = dk->denom; - ndk = GNUNET_new (struct DenominationKey); - ndk->denom = denom; - ndk->anchor = dk->anchor; - if (GNUNET_OK != - setup_key (ndk, - dk)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_break (0); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - TES_wake_clients (); - return GNUNET_OK; -} - - -/** - * Handle @a client request @a rdr to create signature. Create the - * signature using the respective key and return the result to - * the client. - * - * @param client the client making the request - * @param rdr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_r_derive_request (struct TES_Client *client, - const struct TALER_CRYPTO_CsRDeriveRequest *rdr) -{ - struct GNUNET_CRYPTO_CSPublicRPairP r_pub; - struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); - enum TALER_ErrorCode ec; - enum GNUNET_GenericReturnValue ret; - - ec = do_derive (&rdr->h_cs, - &rdr->nonce, - (0 != ntohl (rdr->for_melt)), - &r_pub); - if (TALER_EC_NONE != ec) - { - return fail_derive (client, - ec); - } - - ret = send_derivation (client, - &r_pub); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Sent CS Derived R after %s\n", - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_duration (now), - GNUNET_YES)); - return ret; -} - - -/** - * Handle @a hdr message received from @a client. - * - * @param client the client that received the message - * @param hdr message that was received - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -cs_work_dispatch (struct TES_Client *client, - const struct GNUNET_MessageHeader *hdr) -{ - uint16_t msize = ntohs (hdr->size); - - switch (ntohs (hdr->type)) - { - case TALER_HELPER_CS_MT_REQ_SIGN: - if (msize < sizeof (struct TALER_CRYPTO_CsSignRequestMessage)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_sign_request ( - client, - (const struct TALER_CRYPTO_CsSignRequestMessage *) hdr); - case TALER_HELPER_CS_MT_REQ_REVOKE: - if (msize != sizeof (struct TALER_CRYPTO_CsRevokeRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_revoke_request ( - client, - (const struct TALER_CRYPTO_CsRevokeRequest *) hdr); - case TALER_HELPER_CS_MT_REQ_BATCH_SIGN: - if (msize <= sizeof (struct TALER_CRYPTO_BatchSignRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_batch_sign_request ( - client, - (const struct TALER_CRYPTO_BatchSignRequest *) hdr); - case TALER_HELPER_CS_MT_REQ_BATCH_RDERIVE: - if (msize <= sizeof (struct TALER_CRYPTO_BatchDeriveRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_batch_derive_request ( - client, - (const struct TALER_CRYPTO_BatchDeriveRequest *) hdr); - case TALER_HELPER_CS_MT_REQ_RDERIVE: - if (msize != sizeof (struct TALER_CRYPTO_CsRDeriveRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_r_derive_request (client, - (const struct - TALER_CRYPTO_CsRDeriveRequest *) hdr); - default: - GNUNET_break_op (0); - return GNUNET_SYSERR; - } -} - - -/** - * Send our initial key set to @a client together with the - * "sync" terminator. - * - * @param client the client to inform - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -cs_client_init (struct TES_Client *client) -{ - size_t obs = 0; - char *buf; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Initializing new client %p\n", - client); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *dk = denom->keys_head; - NULL != dk; - dk = dk->next) - { - obs += ntohs (dk->an->header.size); - } - } - buf = GNUNET_malloc (obs); - obs = 0; - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *dk = denom->keys_head; - NULL != dk; - dk = dk->next) - { - GNUNET_memcpy (&buf[obs], - dk->an, - ntohs (dk->an->header.size)); - obs += ntohs (dk->an->header.size); - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (GNUNET_OK != - TES_transmit_raw (client->csock, - obs, - buf)) - { - GNUNET_free (buf); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Client %p must have disconnected\n", - client); - return GNUNET_SYSERR; - } - GNUNET_free (buf); - { - struct GNUNET_MessageHeader synced = { - .type = htons (TALER_HELPER_CS_SYNCED), - .size = htons (sizeof (synced)) - }; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Sending CS SYNCED message to %p\n", - client); - if (GNUNET_OK != - TES_transmit (client->csock, - &synced)) - { - GNUNET_break (0); - return GNUNET_SYSERR; - } - } - return GNUNET_OK; -} - - -/** - * Notify @a client about all changes to the keys since - * the last generation known to the @a client. - * - * @param client the client to notify - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -cs_update_client_keys (struct TES_Client *client) -{ - size_t obs = 0; - char *buf; - enum GNUNET_GenericReturnValue ret; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *key = denom->keys_head; - NULL != key; - key = key->next) - { - if (key->key_gen <= client->key_gen) - continue; - if (key->purge) - obs += sizeof (struct TALER_CRYPTO_CsKeyPurgeNotification); - else - obs += ntohs (key->an->header.size); - } - } - if (0 == obs) - { - /* nothing to do */ - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return GNUNET_OK; - } - buf = GNUNET_malloc (obs); - obs = 0; - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *key = denom->keys_head; - NULL != key; - key = key->next) - { - if (key->key_gen <= client->key_gen) - continue; - if (key->purge) - { - struct TALER_CRYPTO_CsKeyPurgeNotification pn = { - .header.type = htons (TALER_HELPER_CS_MT_PURGE), - .header.size = htons (sizeof (pn)), - .h_cs = key->h_cs - }; - - GNUNET_memcpy (&buf[obs], - &pn, - sizeof (pn)); - GNUNET_assert (obs + sizeof (pn) - > obs); - obs += sizeof (pn); - } - else - { - GNUNET_memcpy (&buf[obs], - key->an, - ntohs (key->an->header.size)); - GNUNET_assert (obs + ntohs (key->an->header.size) - > obs); - obs += ntohs (key->an->header.size); - } - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - ret = TES_transmit_raw (client->csock, - obs, - buf); - GNUNET_free (buf); - return ret; -} - - -/** - * Create a new denomination key (we do not have enough). - * - * @param denom denomination key to create - * @param now current time to use (to get many keys to use the exact same time) - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -create_key (struct Denomination *denom, - struct GNUNET_TIME_Timestamp now) -{ - struct DenominationKey *dk; - struct GNUNET_TIME_Timestamp anchor; - - anchor = now; - if (NULL != denom->keys_tail) - { - struct GNUNET_TIME_Absolute abs; - - abs = GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, - GNUNET_TIME_relative_subtract ( - denom->duration_withdraw, - overlap_duration)); - if (GNUNET_TIME_absolute_cmp (now.abs_time, <, abs)) - anchor = GNUNET_TIME_absolute_to_timestamp (abs); - } - dk = GNUNET_new (struct DenominationKey); - dk->denom = denom; - dk->anchor = anchor; - if (GNUNET_OK != - setup_key (dk, - denom->keys_tail)) - { - GNUNET_break (0); - GNUNET_free (dk); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * At what time does this denomination require its next action? - * Basically, the minimum of the withdraw expiration time of the - * oldest denomination key, and the withdraw expiration time of - * the newest denomination key minus the #lookahead_sign time. - * - * @param denom denomination to compute action time for - */ -static struct GNUNET_TIME_Absolute -denomination_action_time (const struct Denomination *denom) -{ - struct DenominationKey *head = denom->keys_head; - struct DenominationKey *tail = denom->keys_tail; - struct GNUNET_TIME_Absolute tt; - - if (NULL == head) - return GNUNET_TIME_UNIT_ZERO_ABS; - tt = GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (tail->anchor.abs_time, - denom->duration_withdraw), - lookahead_sign), - overlap_duration); - if (head->rc > 0) - return tt; /* head expiration does not count due to rc > 0 */ - return GNUNET_TIME_absolute_min ( - GNUNET_TIME_absolute_add (head->anchor.abs_time, - denom->duration_withdraw), - tt); -} - - -/** - * Create new keys and expire ancient keys of the given denomination @a denom. - * Removes the @a denom from the #denom_head DLL and re-insert its at the - * correct location sorted by next maintenance activity. - * - * @param[in,out] denom denomination to update material for - * @param now current time to use (to get many keys to use the exact same time) - * @param[in,out] wake set to true if we should wake the clients - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -update_keys (struct Denomination *denom, - struct GNUNET_TIME_Timestamp now, - bool *wake) -{ - /* create new denomination keys */ - if (NULL != denom->keys_tail) - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Updating keys of denomination `%s', last key %s valid for another %s\n", - denom->section, - GNUNET_h2s (&denom->keys_tail->h_cs.hash), - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_remaining ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add ( - denom->keys_tail->anchor.abs_time, - denom->duration_withdraw), - overlap_duration)), - GNUNET_YES)); - while ( (NULL == denom->keys_tail) || - GNUNET_TIME_absolute_is_past ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, - denom->duration_withdraw), - lookahead_sign), - overlap_duration)) ) - { - if (! *wake) - { - key_gen++; - *wake = true; - } - if (GNUNET_OK != - create_key (denom, - now)) - { - GNUNET_break (0); - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return GNUNET_SYSERR; - } - } - /* remove expired denomination keys */ - while ( (NULL != denom->keys_head) && - GNUNET_TIME_absolute_is_past - (GNUNET_TIME_absolute_add (denom->keys_head->anchor.abs_time, - denom->duration_withdraw)) ) - { - struct DenominationKey *key = denom->keys_head; - struct DenominationKey *nxt = key->next; - - if (0 != key->rc) - break; /* later */ - GNUNET_CONTAINER_DLL_remove (denom->keys_head, - denom->keys_tail, - key); - GNUNET_assert (GNUNET_OK == - GNUNET_CONTAINER_multihashmap_remove ( - keys, - &key->h_cs.hash, - key)); - if ( (! key->purge) && - (0 != unlink (key->filename)) ) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - key->filename); - GNUNET_free (key->filename); - GNUNET_free (key->an); - GNUNET_free (key); - key = nxt; - } - - /* Update position of 'denom' in #denom_head DLL: sort by action time */ - { - struct Denomination *before; - struct GNUNET_TIME_Absolute at; - - at = denomination_action_time (denom); - GNUNET_CONTAINER_DLL_remove (denom_head, - denom_tail, - denom); - before = NULL; - for (struct Denomination *pos = denom_head; - NULL != pos; - pos = pos->next) - { - if (GNUNET_TIME_absolute_cmp (denomination_action_time (pos), >=, at)) - break; - before = pos; - } - GNUNET_CONTAINER_DLL_insert_after (denom_head, - denom_tail, - before, - denom); - } - return GNUNET_OK; -} - - -/** - * Task run periodically to expire keys and/or generate fresh ones. - * - * @param cls NULL - */ -static void -update_denominations (void *cls) -{ - struct Denomination *denom; - struct GNUNET_TIME_Absolute now; - struct GNUNET_TIME_Timestamp t; - bool wake = false; - - (void) cls; - keygen_task = NULL; - now = GNUNET_TIME_absolute_get (); - t = GNUNET_TIME_absolute_to_timestamp (now); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Updating denominations ...\n"); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - do { - denom = denom_head; - if (GNUNET_OK != - update_keys (denom, - t, - &wake)) - return; - } while (denom != denom_head); - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Updating denominations finished ...\n"); - if (wake) - TES_wake_clients (); - keygen_task = GNUNET_SCHEDULER_add_at (denomination_action_time (denom), - &update_denominations, - NULL); -} - - -/** - * Parse private key of denomination @a denom in @a buf. - * - * @param[out] denom denomination of the key - * @param filename name of the file we are parsing, for logging - * @param priv key material - */ -static void -parse_key (struct Denomination *denom, - const char *filename, - const struct GNUNET_CRYPTO_CsPrivateKey *priv) -{ - char *anchor_s; - char dummy; - unsigned long long anchor_ll; - struct GNUNET_TIME_Timestamp anchor; - - anchor_s = strrchr (filename, - '/'); - if (NULL == anchor_s) - { - /* File in a directory without '/' in the name, this makes no sense. */ - GNUNET_break (0); - return; - } - anchor_s++; - if (1 != sscanf (anchor_s, - "%llu%c", - &anchor_ll, - &dummy)) - { - /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return; - } - anchor.abs_time.abs_value_us - = anchor_ll * GNUNET_TIME_UNIT_SECONDS.rel_value_us; - if (anchor_ll != anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us) - { - /* Integer overflow. Bad, invalid filename. */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return; - } - { - struct DenominationKey *dk; - struct DenominationKey *before; - - dk = GNUNET_new (struct DenominationKey); - dk->denom_priv = *priv; - dk->denom = denom; - dk->anchor = anchor; - dk->filename = GNUNET_strdup (filename); - GNUNET_CRYPTO_cs_private_key_get_public (priv, - &dk->denom_pub); - GNUNET_CRYPTO_hash (&dk->denom_pub, - sizeof (dk->denom_pub), - &dk->h_cs.hash); - generate_response (dk); - if (GNUNET_OK != - GNUNET_CONTAINER_multihashmap_put ( - keys, - &dk->h_cs.hash, - dk, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Duplicate private key %s detected in file `%s'. Skipping.\n", - GNUNET_h2s (&dk->h_cs.hash), - filename); - GNUNET_free (dk->an); - GNUNET_free (dk); - return; - } - before = NULL; - for (struct DenominationKey *pos = denom->keys_head; - NULL != pos; - pos = pos->next) - { - if (GNUNET_TIME_timestamp_cmp (pos->anchor, - >, - anchor)) - break; - before = pos; - } - GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, - denom->keys_tail, - before, - dk); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Imported key %s from `%s'\n", - GNUNET_h2s (&dk->h_cs.hash), - filename); - } -} - - -/** - * Import a private key from @a filename for the denomination - * given in @a cls. - * - * @param[in,out] cls a `struct Denomiantion` - * @param filename name of a file in the directory - * @return #GNUNET_OK (always, continue to iterate) - */ -static enum GNUNET_GenericReturnValue -import_key (void *cls, - const char *filename) -{ - struct Denomination *denom = cls; - struct GNUNET_DISK_FileHandle *fh; - struct GNUNET_DISK_MapHandle *map; - void *ptr; - int fd; - struct stat sbuf; - - { - struct stat lsbuf; - - if (0 != lstat (filename, - &lsbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "lstat", - filename); - return GNUNET_OK; - } - if (! S_ISREG (lsbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - return GNUNET_OK; - } - } - - fd = open (filename, - O_RDONLY | O_CLOEXEC); - if (-1 == fd) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - return GNUNET_OK; - } - if (0 != fstat (fd, - &sbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "stat", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (! S_ISREG (sbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) - { - /* permission are NOT tight, try to patch them up! */ - if (0 != - fchmod (fd, - S_IRUSR)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "fchmod", - filename); - /* refuse to use key if file has wrong permissions */ - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - } - fh = GNUNET_DISK_get_handle_from_int_fd (fd); - if (NULL == fh) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (sbuf.st_size != sizeof(struct GNUNET_CRYPTO_CsPrivateKey)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' too big to be a private key\n", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - ptr = GNUNET_DISK_file_map (fh, - &map, - GNUNET_DISK_MAP_TYPE_READ, - (size_t) sbuf.st_size); - if (NULL == ptr) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "mmap", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - parse_key (denom, - filename, - (const struct GNUNET_CRYPTO_CsPrivateKey *) ptr); - GNUNET_DISK_file_unmap (map); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; -} - - -/** - * Parse configuration for denomination type parameters. Also determines - * our anchor by looking at the existing denominations of the same type. - * - * @param cfg configuration to use - * @param ct section in the configuration file giving the denomination type parameters - * @param[out] denom set to the denomination parameters from the configuration - * @return #GNUNET_OK on success, #GNUNET_SYSERR if the configuration is invalid - */ -static enum GNUNET_GenericReturnValue -parse_denomination_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg, - const char *ct, - struct Denomination *denom) -{ - char *secname; - - GNUNET_asprintf (&secname, - "%s-secmod-cs", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - ct, - "DURATION_WITHDRAW", - &denom->duration_withdraw)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - ct, - "DURATION_WITHDRAW"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if (GNUNET_TIME_relative_cmp (overlap_duration, - >=, - denom->duration_withdraw)) - { - GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, - secname, - "OVERLAP_DURATION", - "Value given must be smaller than value for DURATION_WITHDRAW!"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - GNUNET_free (secname); - denom->section = GNUNET_strdup (ct); - return GNUNET_OK; -} - - -/** - * Closure for #load_denominations. - */ -struct LoadContext -{ - - /** - * Configuration to use. - */ - const struct GNUNET_CONFIGURATION_Handle *cfg; - - /** - * Current time to use. - */ - struct GNUNET_TIME_Timestamp t; - - /** - * Status, to be set to #GNUNET_SYSERR on failure - */ - enum GNUNET_GenericReturnValue ret; -}; - - -/** - * Generate new denomination signing keys for the denomination type of the given @a - * denomination_alias. - * - * @param cls a `struct LoadContext`, with 'ret' to be set to #GNUNET_SYSERR on failure - * @param denomination_alias name of the denomination's section in the configuration - */ -static void -load_denominations (void *cls, - const char *denomination_alias) -{ - struct LoadContext *ctx = cls; - struct Denomination *denom; - bool wake = true; - char *cipher; - - if ( (0 != strncasecmp (denomination_alias, - "coin_", - strlen ("coin_"))) && - (0 != strncasecmp (denomination_alias, - "coin-", - strlen ("coin-"))) ) - return; /* not a denomination type definition */ - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_string (ctx->cfg, - denomination_alias, - "CIPHER", - &cipher)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - denomination_alias, - "CIPHER"); - return; - } - if (0 != strcmp (cipher, "CS")) - { - GNUNET_free (cipher); - return; /* Ignore denominations of other types than CS*/ - } - GNUNET_free (cipher); - - denom = GNUNET_new (struct Denomination); - if (GNUNET_OK != - parse_denomination_cfg (ctx->cfg, - denomination_alias, - denom)) - { - ctx->ret = GNUNET_SYSERR; - GNUNET_free (denom); - return; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Loading keys for denomination %s\n", - denom->section); - { - char *dname; - - GNUNET_asprintf (&dname, - "%s/%s", - keydir, - denom->section); - GNUNET_break (GNUNET_OK == - GNUNET_DISK_directory_create (dname)); - GNUNET_DISK_directory_scan (dname, - &import_key, - denom); - GNUNET_free (dname); - } - GNUNET_CONTAINER_DLL_insert (denom_head, - denom_tail, - denom); - update_keys (denom, - ctx->t, - &wake); -} - - -/** - * Load the various duration values from @a cfg - * - * @param cfg configuration to use - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - char *secname; - - GNUNET_asprintf (&secname, - "%s-secmod-cs", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "OVERLAP_DURATION", - &overlap_duration)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "OVERLAP_DURATION"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "LOOKAHEAD_SIGN", - &lookahead_sign)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "LOOKAHEAD_SIGN"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - GNUNET_free (secname); - return GNUNET_OK; -} - - -/** - * Function run on shutdown. Stops the various jobs (nicely). - * - * @param cls NULL - */ -static void -do_shutdown (void *cls) -{ - (void) cls; - TES_listen_stop (); - if (NULL != keygen_task) - { - GNUNET_SCHEDULER_cancel (keygen_task); - keygen_task = NULL; - } - stop_workers (); - sem_done (&worker_sem); -} - - -/** - * Main function that will be run under the GNUnet scheduler. - * - * @param cls closure - * @param args remaining command-line arguments - * @param cfgfile name of the configuration file used (for saving, can be NULL!) - * @param cfg configuration - */ -static void -run (void *cls, - char *const *args, - const char *cfgfile, - const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - static struct TES_Callbacks cb = { - .dispatch = &cs_work_dispatch, - .updater = &cs_update_client_keys, - .init = &cs_client_init - }; - char *secname; - - (void) cls; - (void) args; - (void) cfgfile; - if (GNUNET_TIME_timestamp_cmp (global_now, - !=, - global_now_tmp)) - { - /* The user gave "--now", use it! */ - global_now = global_now_tmp; - } - else - { - /* get current time again, we may be timetraveling! */ - global_now = GNUNET_TIME_timestamp_get (); - } - GNUNET_asprintf (&secname, - "%s-secmod-cs", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_filename (cfg, - secname, - "KEY_DIR", - &keydir)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "KEY_DIR"); - GNUNET_free (secname); - global_ret = EXIT_NOTCONFIGURED; - return; - } - if (GNUNET_OK != - load_durations (cfg)) - { - global_ret = EXIT_NOTCONFIGURED; - GNUNET_free (secname); - return; - } - global_ret = TES_listen_start (cfg, - secname, - &cb); - GNUNET_free (secname); - if (0 != global_ret) - return; - sem_init (&worker_sem, - 0); - GNUNET_SCHEDULER_add_shutdown (&do_shutdown, - NULL); - if (0 == max_workers) - { - long lret; - - lret = sysconf (_SC_NPROCESSORS_CONF); - if (lret <= 0) - lret = 1; - max_workers = (unsigned int) lret; - } - for (unsigned int i = 0; i<max_workers; i++) - if (GNUNET_OK != - start_worker ()) - { - GNUNET_SCHEDULER_shutdown (); - return; - } - /* Load denominations */ - keys = GNUNET_CONTAINER_multihashmap_create (65536, - GNUNET_YES); - { - struct LoadContext lc = { - .cfg = cfg, - .ret = GNUNET_OK, - .t = global_now - }; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_CONFIGURATION_iterate_sections (cfg, - &load_denominations, - &lc); - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (GNUNET_OK != lc.ret) - { - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return; - } - } - if (NULL == denom_head) - { - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "No CS denominations configured\n"); - TES_wake_clients (); - return; - } - /* start job to keep keys up-to-date; MUST be run before the #listen_task, - hence with priority. */ - keygen_task = GNUNET_SCHEDULER_add_with_priority ( - GNUNET_SCHEDULER_PRIORITY_URGENT, - &update_denominations, - NULL); -} - /** * The entry point. @@ -2296,44 +45,31 @@ int main (int argc, char **argv) { + struct TALER_SECMOD_Options opts = { + .max_workers = 16, + .section = "taler-exchange" + }; struct GNUNET_GETOPT_CommandLineOption options[] = { - GNUNET_GETOPT_option_string ('s', - "section", - "SECTION", - "name of the configuration section prefix to use, default is 'taler'", - §ion), - GNUNET_GETOPT_option_timetravel ('T', - "timetravel"), - GNUNET_GETOPT_option_timestamp ('t', - "time", - "TIMESTAMP", - "pretend it is a different time for the update", - &global_now_tmp), - GNUNET_GETOPT_option_uint ('w', - "workers", - "COUNT", - "use COUNT workers for parallel processing of batch requests", - &max_workers), + TALER_SECMOD_OPTIONS (&opts), GNUNET_GETOPT_OPTION_END }; enum GNUNET_GenericReturnValue ret; /* Restrict permissions for the key files that we create. */ (void) umask (S_IWGRP | S_IROTH | S_IWOTH | S_IXOTH); - section = GNUNET_strdup ("taler-exchange"); - global_now_tmp - = global_now + opts.global_now_tmp + = opts.global_now = GNUNET_TIME_timestamp_get (); ret = GNUNET_PROGRAM_run (TALER_EXCHANGE_project_data (), argc, argv, "taler-exchange-secmod-cs", "Handle private CS key operations for a Taler exchange", options, - &run, - NULL); + &TALER_SECMOD_cs_run, + &opts); if (GNUNET_NO == ret) return EXIT_SUCCESS; if (GNUNET_SYSERR == ret) return EXIT_INVALIDARGUMENT; - return global_ret; + return opts.global_ret; } diff --git a/src/util/taler-exchange-secmod-eddsa.c b/src/util/taler-exchange-secmod-eddsa.c index 6b314d21c..0f560c38a 100644 --- a/src/util/taler-exchange-secmod-eddsa.c +++ b/src/util/taler-exchange-secmod-eddsa.c @@ -1,6 +1,6 @@ /* This file is part of TALER - Copyright (C) 2014-2021 Taler Systems SA + Copyright (C) 2014-2024 Taler Systems SA TALER is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -34,1124 +34,6 @@ */ #include "platform.h" #include "taler_util.h" -#include "taler-exchange-secmod-eddsa.h" -#include <gcrypt.h> -#include <pthread.h> -#include "taler_error_codes.h" -#include "taler_signatures.h" -#include "secmod_common.h" -#include <poll.h> - - -/** - * One particular key. - */ -struct Key -{ - - /** - * Kept in a DLL. Sorted by anchor time. - */ - struct Key *next; - - /** - * Kept in a DLL. Sorted by anchor time. - */ - struct Key *prev; - - /** - * Name of the file this key is stored under. - */ - char *filename; - - /** - * The private key. - */ - struct TALER_ExchangePrivateKeyP exchange_priv; - - /** - * The public key. - */ - struct TALER_ExchangePublicKeyP exchange_pub; - - /** - * Time at which this key is supposed to become valid. - */ - struct GNUNET_TIME_Timestamp anchor; - - /** - * Generation when this key was created or revoked. - */ - uint64_t key_gen; - - /** - * Reference counter. Counts the number of threads that are - * using this key at this time. - */ - unsigned int rc; - - /** - * Flag set to true if this key has been purged and the memory - * must be freed as soon as @e rc hits zero. - */ - bool purge; - -}; - - -/** - * Head of DLL of actual keys, sorted by anchor. - */ -static struct Key *keys_head; - -/** - * Tail of DLL of actual keys. - */ -static struct Key *keys_tail; - -/** - * How long can a key be used? - */ -static struct GNUNET_TIME_Relative duration; - -/** - * Return value from main(). - */ -static int global_ret; - -/** - * Time when the key update is executed. - * Either the actual current time, or a pretended time. - */ -static struct GNUNET_TIME_Timestamp now; - -/** - * The time for the key update, as passed by the user - * on the command line. - */ -static struct GNUNET_TIME_Timestamp now_tmp; - -/** - * Where do we store the keys? - */ -static char *keydir; - -/** - * Name of the configuration section prefix to use. Usually either "taler-exchange" or - * "donau". The actual configuration section will then be - * "$SECTION-secmod-eddsa". - */ -static char *section; - -/** - * How much should coin creation duration overlap - * with the next key? Basically, the starting time of two - * keys is always #duration - #overlap_duration apart. - */ -static struct GNUNET_TIME_Relative overlap_duration; - -/** - * How long into the future do we pre-generate keys? - */ -static struct GNUNET_TIME_Relative lookahead_sign; - -/** - * Task run to generate new keys. - */ -static struct GNUNET_SCHEDULER_Task *keygen_task; - -/** - * Lock for the keys queue. - */ -static pthread_mutex_t keys_lock; - -/** - * Current key generation. - */ -static uint64_t key_gen; - - -/** - * Notify @a client about @a key becoming available. - * - * @param[in,out] client the client to notify; possible freed if transmission fails - * @param key the key to notify @a client about - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -notify_client_key_add (struct TES_Client *client, - const struct Key *key) -{ - struct TALER_CRYPTO_EddsaKeyAvailableNotification an = { - .header.size = htons (sizeof (an)), - .header.type = htons (TALER_HELPER_EDDSA_MT_AVAIL), - .anchor_time = GNUNET_TIME_timestamp_hton (key->anchor), - .duration = GNUNET_TIME_relative_hton (duration), - .exchange_pub = key->exchange_pub, - .secm_pub = TES_smpub - }; - - TALER_exchange_secmod_eddsa_sign (&key->exchange_pub, - key->anchor, - duration, - &TES_smpriv, - &an.secm_sig); - if (GNUNET_OK != - TES_transmit (client->csock, - &an.header)) - { - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Client %p must have disconnected\n", - client); - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * Notify @a client about @a key being purged. - * - * @param[in,out] client the client to notify; possible freed if transmission fails - * @param key the key to notify @a client about - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -notify_client_key_del (struct TES_Client *client, - const struct Key *key) -{ - struct TALER_CRYPTO_EddsaKeyPurgeNotification pn = { - .header.type = htons (TALER_HELPER_EDDSA_MT_PURGE), - .header.size = htons (sizeof (pn)), - .exchange_pub = key->exchange_pub - }; - - if (GNUNET_OK != - TES_transmit (client->csock, - &pn.header)) - { - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Client %p must have disconnected\n", - client); - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * Handle @a client request @a sr to create signature. Create the - * signature using the respective key and return the result to - * the client. - * - * @param client the client making the request - * @param sr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_sign_request (struct TES_Client *client, - const struct TALER_CRYPTO_EddsaSignRequest *sr) -{ - const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose = &sr->purpose; - size_t purpose_size = ntohs (sr->header.size) - sizeof (*sr) - + sizeof (*purpose); - struct Key *key; - struct TALER_CRYPTO_EddsaSignResponse sres = { - .header.size = htons (sizeof (sres)), - .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGNATURE) - }; - enum TALER_ErrorCode ec; - - if (purpose_size != htonl (purpose->size)) - { - struct TALER_CRYPTO_EddsaSignFailure sf = { - .header.size = htons (sizeof (sr)), - .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGN_FAILURE), - .ec = htonl (TALER_EC_GENERIC_PARAMETER_MALFORMED) - }; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Signing request failed, request malformed\n"); - return TES_transmit (client->csock, - &sf.header); - } - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - key = keys_head; - while ( (NULL != key) && - (GNUNET_TIME_absolute_is_past ( - GNUNET_TIME_absolute_add (key->anchor.abs_time, - duration))) ) - { - struct Key *nxt = key->next; - - if (0 != key->rc) - break; /* do later */ - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Deleting past key %s (expired %s ago)\n", - TALER_B2S (&nxt->exchange_pub), - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_duration ( - GNUNET_TIME_absolute_add (key->anchor.abs_time, - duration)), - GNUNET_YES)); - GNUNET_CONTAINER_DLL_remove (keys_head, - keys_tail, - key); - if ( (! key->purge) && - (0 != unlink (key->filename)) ) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - key->filename); - GNUNET_free (key->filename); - GNUNET_free (key); - key = nxt; - } - if (NULL == key) - { - GNUNET_break (0); - ec = TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING; - } - else - { - GNUNET_assert (key->rc < UINT_MAX); - key->rc++; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_sign_ (&key->exchange_priv.eddsa_priv, - purpose, - &sres.exchange_sig.eddsa_signature)) - ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE; - else - ec = TALER_EC_NONE; - sres.exchange_pub = key->exchange_pub; - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_assert (key->rc > 0); - key->rc--; - } - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (TALER_EC_NONE != ec) - { - struct TALER_CRYPTO_EddsaSignFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_EDDSA_MT_RES_SIGN_FAILURE), - .ec = htonl ((uint32_t) ec) - }; - - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Signing request %p failed, worker failed to produce signature\n", - client); - return TES_transmit (client->csock, - &sf.header); - } - return TES_transmit (client->csock, - &sres.header); -} - - -/** - * Initialize key material for key @a key (also on disk). - * - * @param[in,out] key to compute key material for - * @param position where in the DLL will the @a key go - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -setup_key (struct Key *key, - struct Key *position) -{ - struct GNUNET_CRYPTO_EddsaPrivateKey priv; - struct GNUNET_CRYPTO_EddsaPublicKey pub; - - GNUNET_CRYPTO_eddsa_key_create (&priv); - GNUNET_CRYPTO_eddsa_key_get_public (&priv, - &pub); - GNUNET_asprintf (&key->filename, - "%s/%llu", - keydir, - (unsigned long long) (key->anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us - )); - if (GNUNET_OK != - GNUNET_DISK_fn_write (key->filename, - &priv, - sizeof (priv), - GNUNET_DISK_PERM_USER_READ)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "write", - key->filename); - return GNUNET_SYSERR; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Setup fresh private key in `%s'\n", - key->filename); - key->key_gen = key_gen; - key->exchange_priv.eddsa_priv = priv; - key->exchange_pub.eddsa_pub = pub; - GNUNET_CONTAINER_DLL_insert_after (keys_head, - keys_tail, - position, - key); - return GNUNET_OK; -} - - -/** - * The validity period of a key @a key has expired. Purge it. - * - * @param[in] key expired or revoked key to purge - */ -static void -purge_key (struct Key *key) -{ - if (key->purge) - { - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Key %s already purged, skipping\n", - TALER_B2S (&key->exchange_pub)); - return; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Purging key %s\n", - TALER_B2S (&key->exchange_pub)); - if (0 != unlink (key->filename)) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - key->filename); - key->purge = true; - key->key_gen = key_gen; - GNUNET_free (key->filename); -} - - -/** - * A @a client informs us that a key has been revoked. - * Check if the key is still in use, and if so replace (!) - * it with a fresh key. - * - * @param client the client making the request - * @param rr the revocation request - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_revoke_request (struct TES_Client *client, - const struct TALER_CRYPTO_EddsaRevokeRequest *rr) -{ - struct Key *key; - struct Key *nkey; - - (void) client; - key = NULL; - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Key *pos = keys_head; - NULL != pos; - pos = pos->next) - if (0 == GNUNET_memcmp (&pos->exchange_pub, - &rr->exchange_pub)) - { - key = pos; - break; - } - if (NULL == key) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, key unknown\n"); - return GNUNET_OK; - } - if (key->purge) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, key %s already revoked\n", - TALER_B2S (&key->exchange_pub)); - return GNUNET_OK; - } - key_gen++; - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Revoking key %s, bumping generation to %llu\n", - TALER_B2S (&key->exchange_pub), - (unsigned long long) key_gen); - purge_key (key); - - /* Setup replacement key */ - nkey = GNUNET_new (struct Key); - nkey->anchor = key->anchor; - if (GNUNET_OK != - setup_key (nkey, - key)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_break (0); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - TES_wake_clients (); - return GNUNET_OK; -} - - -/** - * Handle @a hdr message received from @a client. - * - * @param client the client that received the message - * @param hdr message that was received - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -eddsa_work_dispatch (struct TES_Client *client, - const struct GNUNET_MessageHeader *hdr) -{ - uint16_t msize = ntohs (hdr->size); - - switch (ntohs (hdr->type)) - { - case TALER_HELPER_EDDSA_MT_REQ_SIGN: - if (msize < sizeof (struct TALER_CRYPTO_EddsaSignRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_sign_request ( - client, - (const struct TALER_CRYPTO_EddsaSignRequest *) hdr); - case TALER_HELPER_EDDSA_MT_REQ_REVOKE: - if (msize != sizeof (struct TALER_CRYPTO_EddsaRevokeRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_revoke_request ( - client, - (const struct TALER_CRYPTO_EddsaRevokeRequest *) hdr); - default: - GNUNET_break_op (0); - return GNUNET_SYSERR; - } -} - - -/** - * Send our initial key set to @a client together with the - * "sync" terminator. - * - * @param client the client to inform - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -eddsa_client_init (struct TES_Client *client) -{ - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Key *key = keys_head; - NULL != key; - key = key->next) - { - if (GNUNET_OK != - notify_client_key_add (client, - key)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_break (0); - return GNUNET_SYSERR; - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - { - struct GNUNET_MessageHeader synced = { - .type = htons (TALER_HELPER_EDDSA_SYNCED), - .size = htons (sizeof (synced)) - }; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Client %p synced\n", - client); - if (GNUNET_OK != - TES_transmit (client->csock, - &synced)) - { - GNUNET_break (0); - return GNUNET_SYSERR; - } - } - return GNUNET_OK; -} - - -/** - * Notify @a client about all changes to the keys since - * the last generation known to the @a client. - * - * @param client the client to notify - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -eddsa_update_client_keys (struct TES_Client *client) -{ - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Updating client %p to generation %llu\n", - client, - (unsigned long long) key_gen); - for (struct Key *key = keys_head; - NULL != key; - key = key->next) - { - if (key->key_gen <= client->key_gen) - { - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Skipping key %s, no change since generation %llu\n", - TALER_B2S (&key->exchange_pub), - (unsigned long long) client->key_gen); - continue; - } - if (key->purge) - { - if (GNUNET_OK != - notify_client_key_del (client, - key)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return GNUNET_SYSERR; - } - } - else - { - if (GNUNET_OK != - notify_client_key_add (client, - key)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return GNUNET_SYSERR; - } - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return GNUNET_OK; -} - - -/** - * Create a new key (we do not have enough). - * - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -create_key (void) -{ - struct Key *key; - struct GNUNET_TIME_Timestamp anchor; - - anchor = GNUNET_TIME_timestamp_get (); - if (NULL != keys_tail) - { - struct GNUNET_TIME_Absolute abs; - - abs = GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, - GNUNET_TIME_relative_subtract ( - duration, - overlap_duration)); - if (GNUNET_TIME_absolute_cmp (anchor.abs_time, - <, - abs)) - anchor = GNUNET_TIME_absolute_to_timestamp (abs); - } - key = GNUNET_new (struct Key); - key->anchor = anchor; - if (GNUNET_OK != - setup_key (key, - keys_tail)) - { - GNUNET_break (0); - GNUNET_free (key); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * At what time does the current key set require its next action? Basically, - * the minimum of the expiration time of the oldest key, and the expiration - * time of the newest key minus the #lookahead_sign time. - */ -static struct GNUNET_TIME_Absolute -key_action_time (void) -{ - struct Key *nxt; - - nxt = keys_head; - while ( (NULL != nxt) && - (nxt->purge) ) - nxt = nxt->next; - if (NULL == nxt) - return GNUNET_TIME_UNIT_ZERO_ABS; - return GNUNET_TIME_absolute_min ( - GNUNET_TIME_absolute_add (nxt->anchor.abs_time, - duration), - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, - duration), - lookahead_sign), - overlap_duration)); -} - - -/** - * Create new keys and expire ancient keys. - * - * @param cls NULL - */ -static void -update_keys (void *cls) -{ - bool wake = false; - struct Key *nxt; - - (void) cls; - keygen_task = NULL; - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - /* create new keys */ - while ( (NULL == keys_tail) || - GNUNET_TIME_absolute_is_past ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (keys_tail->anchor.abs_time, - duration), - lookahead_sign), - overlap_duration)) ) - { - if (! wake) - { - key_gen++; - wake = true; - } - if (GNUNET_OK != - create_key ()) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_break (0); - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return; - } - } - nxt = keys_head; - /* purge expired keys */ - while ( (NULL != nxt) && - GNUNET_TIME_absolute_is_past ( - GNUNET_TIME_absolute_add (nxt->anchor.abs_time, - duration))) - { - if (! wake) - { - key_gen++; - wake = true; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Purging past key %s (expired %s ago)\n", - TALER_B2S (&nxt->exchange_pub), - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_duration ( - GNUNET_TIME_absolute_add (nxt->anchor.abs_time, - duration)), - GNUNET_YES)); - purge_key (nxt); - nxt = nxt->next; - } - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (wake) - TES_wake_clients (); - keygen_task = GNUNET_SCHEDULER_add_at (key_action_time (), - &update_keys, - NULL); -} - - -/** - * Parse private key from @a filename in @a buf. - * - * @param filename name of the file we are parsing, for logging - * @param buf key material - * @param buf_size number of bytes in @a buf - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -parse_key (const char *filename, - const void *buf, - size_t buf_size) -{ - struct GNUNET_CRYPTO_EddsaPrivateKey priv; - char *anchor_s; - char dummy; - unsigned long long anchor_ll; - struct GNUNET_TIME_Timestamp anchor; - - anchor_s = strrchr (filename, - '/'); - if (NULL == anchor_s) - { - /* File in a directory without '/' in the name, this makes no sense. */ - GNUNET_break (0); - return GNUNET_SYSERR; - } - anchor_s++; - if (1 != sscanf (anchor_s, - "%llu%c", - &anchor_ll, - &dummy)) - { - /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return GNUNET_SYSERR; - } - anchor.abs_time.abs_value_us = anchor_ll - * GNUNET_TIME_UNIT_SECONDS.rel_value_us; - if (anchor_ll != anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us) - { - /* Integer overflow. Bad, invalid filename. */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return GNUNET_SYSERR; - } - if (buf_size != sizeof (priv)) - { - /* Parser failure. */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "File `%s' is malformed, skipping\n", - filename); - return GNUNET_SYSERR; - } - GNUNET_memcpy (&priv, - buf, - buf_size); - - { - struct GNUNET_CRYPTO_EddsaPublicKey pub; - struct Key *key; - struct Key *before; - - GNUNET_CRYPTO_eddsa_key_get_public (&priv, - &pub); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - key = GNUNET_new (struct Key); - key->exchange_priv.eddsa_priv = priv; - key->exchange_pub.eddsa_pub = pub; - key->anchor = anchor; - key->filename = GNUNET_strdup (filename); - key->key_gen = key_gen; - before = NULL; - for (struct Key *pos = keys_head; - NULL != pos; - pos = pos->next) - { - if (GNUNET_TIME_timestamp_cmp (pos->anchor, >, anchor)) - break; - before = pos; - } - GNUNET_CONTAINER_DLL_insert_after (keys_head, - keys_tail, - before, - key); - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Imported key from `%s'\n", - filename); - } - return GNUNET_OK; -} - - -/** - * Import a private key from @a filename. - * - * @param cls NULL - * @param filename name of a file in the directory - */ -static enum GNUNET_GenericReturnValue -import_key (void *cls, - const char *filename) -{ - struct GNUNET_DISK_FileHandle *fh; - struct GNUNET_DISK_MapHandle *map; - void *ptr; - int fd; - struct stat sbuf; - - (void) cls; - { - struct stat lsbuf; - - if (0 != lstat (filename, - &lsbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "lstat", - filename); - return GNUNET_OK; - } - if (! S_ISREG (lsbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - return GNUNET_OK; - } - } - - fd = open (filename, - O_RDONLY | O_CLOEXEC); - if (-1 == fd) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - return GNUNET_OK; - } - if (0 != fstat (fd, - &sbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "stat", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (! S_ISREG (sbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) - { - /* permission are NOT tight, try to patch them up! */ - if (0 != - fchmod (fd, - S_IRUSR)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "fchmod", - filename); - /* refuse to use key if file has wrong permissions */ - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - } - fh = GNUNET_DISK_get_handle_from_int_fd (fd); - if (NULL == fh) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (sbuf.st_size > 2048) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' to big to be a private key\n", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - ptr = GNUNET_DISK_file_map (fh, - &map, - GNUNET_DISK_MAP_TYPE_READ, - (size_t) sbuf.st_size); - if (NULL == ptr) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "mmap", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - (void) parse_key (filename, - ptr, - (size_t) sbuf.st_size); - GNUNET_DISK_file_unmap (map); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; -} - - -/** - * Load the various duration values from @a kcfg. - * - * @param cfg configuration to use - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - char *secname; - - GNUNET_asprintf (&secname, - "%s-secmod-eddsa", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "OVERLAP_DURATION", - &overlap_duration)) - { - GNUNET_free (secname); - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "OVERLAP_DURATION"); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "DURATION", - &duration)) - { - GNUNET_free (secname); - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "DURATION"); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "LOOKAHEAD_SIGN", - &lookahead_sign)) - { - GNUNET_free (secname); - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "LOOKAHEAD_SIGN"); - return GNUNET_SYSERR; - } - GNUNET_free (secname); - return GNUNET_OK; -} - - -/** - * Function run on shutdown. Stops the various jobs (nicely). - * - * @param cls NULL - */ -static void -do_shutdown (void *cls) -{ - (void) cls; - TES_listen_stop (); - if (NULL != keygen_task) - { - GNUNET_SCHEDULER_cancel (keygen_task); - keygen_task = NULL; - } -} - - -/** - * Main function that will be run under the GNUnet scheduler. - * - * @param cls closure - * @param args remaining command-line arguments - * @param cfgfile name of the configuration file used (for saving, can be NULL!) - * @param cfg configuration - */ -static void -run (void *cls, - char *const *args, - const char *cfgfile, - const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - static struct TES_Callbacks cb = { - .dispatch = eddsa_work_dispatch, - .updater = eddsa_update_client_keys, - .init = eddsa_client_init - }; - char *secname; - - (void) cls; - (void) args; - (void) cfgfile; - if (GNUNET_TIME_timestamp_cmp (now, !=, now_tmp)) - { - /* The user gave "--now", use it! */ - now = now_tmp; - } - else - { - /* get current time again, we may be timetraveling! */ - now = GNUNET_TIME_timestamp_get (); - } - GNUNET_asprintf (&secname, - "%s-secmod-eddsa", - section); - if (GNUNET_OK != - load_durations (cfg)) - { - global_ret = EXIT_NOTCONFIGURED; - return; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_filename (cfg, - secname, - "KEY_DIR", - &keydir)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "KEY_DIR"); - GNUNET_free (secname); - global_ret = EXIT_NOTCONFIGURED; - return; - } - GNUNET_SCHEDULER_add_shutdown (&do_shutdown, - NULL); - global_ret = TES_listen_start (cfg, - secname, - &cb); - if (0 != global_ret) - return; - /* Load keys */ - GNUNET_break (GNUNET_OK == - GNUNET_DISK_directory_create (keydir)); - GNUNET_DISK_directory_scan (keydir, - &import_key, - NULL); - if ( (NULL != keys_head) && - (GNUNET_TIME_absolute_is_future (keys_head->anchor.abs_time)) ) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Existing anchor is in %s the future. Refusing to start\n", - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_remaining ( - keys_head->anchor.abs_time), - GNUNET_YES)); - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return; - } - /* start job to keep keys up-to-date; MUST be run before the #listen_task, - hence with priority. */ - keygen_task = GNUNET_SCHEDULER_add_with_priority ( - GNUNET_SCHEDULER_PRIORITY_URGENT, - &update_keys, - NULL); -} /** @@ -1165,38 +47,31 @@ int main (int argc, char **argv) { + struct TALER_SECMOD_Options opts = { + .max_workers = 16, + .section = "taler-exchange" + }; struct GNUNET_GETOPT_CommandLineOption options[] = { - GNUNET_GETOPT_option_string ('s', - "section", - "SECTION", - "name of the configuration section prefix to use, default is 'taler'", - §ion), - GNUNET_GETOPT_option_timetravel ('T', - "timetravel"), - GNUNET_GETOPT_option_timestamp ('t', - "time", - "TIMESTAMP", - "pretend it is a different time for the update", - &now_tmp), + TALER_SECMOD_OPTIONS (&opts), GNUNET_GETOPT_OPTION_END }; enum GNUNET_GenericReturnValue ret; /* Restrict permissions for the key files that we create. */ (void) umask (S_IWGRP | S_IROTH | S_IWOTH | S_IXOTH); - section = GNUNET_strdup ("taler-exchange"); - now_tmp = now = GNUNET_TIME_timestamp_get (); + opts.global_now_tmp + = opts.global_now = GNUNET_TIME_timestamp_get (); ret = GNUNET_PROGRAM_run (TALER_EXCHANGE_project_data (), argc, argv, "taler-exchange-secmod-eddsa", "Handle private EDDSA key operations for a Taler exchange", options, - &run, - NULL); + &TALER_SECMOD_eddsa_run, + &opts); if (GNUNET_NO == ret) return EXIT_SUCCESS; if (GNUNET_SYSERR == ret) return EXIT_INVALIDARGUMENT; - return global_ret; + return opts.global_ret; } diff --git a/src/util/taler-exchange-secmod-rsa.c b/src/util/taler-exchange-secmod-rsa.c index dac04c815..814766238 100644 --- a/src/util/taler-exchange-secmod-rsa.c +++ b/src/util/taler-exchange-secmod-rsa.c @@ -1,6 +1,6 @@ /* This file is part of TALER - Copyright (C) 2014-2022 Taler Systems SA + Copyright (C) 2014-2024 Taler Systems SA TALER is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -33,2048 +33,6 @@ */ #include "platform.h" #include "taler_util.h" -#include "taler-exchange-secmod-rsa.h" -#include <gcrypt.h> -#include <pthread.h> -#include "taler_error_codes.h" -#include "taler_signatures.h" -#include "secmod_common.h" -#include <poll.h> - - -/** - * Information we keep per denomination. - */ -struct Denomination; - - -/** - * One particular denomination key. - */ -struct DenominationKey -{ - - /** - * Kept in a DLL of the respective denomination. Sorted by anchor time. - */ - struct DenominationKey *next; - - /** - * Kept in a DLL of the respective denomination. Sorted by anchor time. - */ - struct DenominationKey *prev; - - /** - * Denomination this key belongs to. - */ - struct Denomination *denom; - - /** - * Name of the file this key is stored under. - */ - char *filename; - - /** - * The private key of the denomination. - */ - struct GNUNET_CRYPTO_RsaPrivateKey *denom_priv; - - /** - * The public key of the denomination. - */ - struct GNUNET_CRYPTO_RsaPublicKey *denom_pub; - - /** - * Message to transmit to clients to introduce this public key. - */ - struct TALER_CRYPTO_RsaKeyAvailableNotification *an; - - /** - * Hash of this denomination's public key. - */ - struct TALER_RsaPubHashP h_rsa; - - /** - * Time at which this key is supposed to become valid. - */ - struct GNUNET_TIME_Timestamp anchor; - - /** - * Generation when this key was created or revoked. - */ - uint64_t key_gen; - - /** - * Reference counter. Counts the number of threads that are - * using this key at this time. - */ - unsigned int rc; - - /** - * Flag set to true if this key has been purged and the memory - * must be freed as soon as @e rc hits zero. - */ - bool purge; - -}; - - -struct Denomination -{ - - /** - * Kept in a DLL. Sorted by #denomination_action_time(). - */ - struct Denomination *next; - - /** - * Kept in a DLL. Sorted by #denomination_action_time(). - */ - struct Denomination *prev; - - /** - * Head of DLL of actual keys of this denomination. - */ - struct DenominationKey *keys_head; - - /** - * Tail of DLL of actual keys of this denomination. - */ - struct DenominationKey *keys_tail; - - /** - * How long can coins be withdrawn (generated)? Should be small - * enough to limit how many coins will be signed into existence with - * the same key, but large enough to still provide a reasonable - * anonymity set. - */ - struct GNUNET_TIME_Relative duration_withdraw; - - /** - * What is the configuration section of this denomination type? Also used - * for the directory name where the denomination keys are stored. - */ - char *section; - - /** - * Length of (new) RSA keys (in bits). - */ - uint32_t rsa_keysize; -}; - - -/** - * A semaphore. - */ -struct Semaphore -{ - /** - * Mutex for the semaphore. - */ - pthread_mutex_t mutex; - - /** - * Condition variable for the semaphore. - */ - pthread_cond_t cv; - - /** - * Counter of the semaphore. - */ - unsigned int ctr; -}; - - -/** - * Job in a batch sign request. - */ -struct BatchJob; - -/** - * Handle for a thread that does work in batch signing. - */ -struct Worker -{ - /** - * Kept in a DLL. - */ - struct Worker *prev; - - /** - * Kept in a DLL. - */ - struct Worker *next; - - /** - * Job this worker should do next. - */ - struct BatchJob *job; - - /** - * Semaphore to signal the worker that a job is available. - */ - struct Semaphore sem; - - /** - * Handle for this thread. - */ - pthread_t pt; - - /** - * Set to true if the worker should terminate. - */ - bool do_shutdown; -}; - - -/** - * Job in a batch sign request. - */ -struct BatchJob -{ - /** - * Request we are working on. - */ - const struct TALER_CRYPTO_SignRequest *sr; - - /** - * Thread doing the work. - */ - struct Worker *worker; - - /** - * Result with the signature. - */ - struct GNUNET_CRYPTO_RsaSignature *rsa_signature; - - /** - * Semaphore to signal that the job is finished. - */ - struct Semaphore sem; - - /** - * Computation status. - */ - enum TALER_ErrorCode ec; - -}; - - -/** - * Head of DLL of workers ready for more work. - */ -static struct Worker *worker_head; - -/** - * Tail of DLL of workers ready for more work. - */ -static struct Worker *worker_tail; - -/** - * Lock for manipulating the worker DLL. - */ -static pthread_mutex_t worker_lock; - -/** - * Total number of workers that were started. - */ -static unsigned int workers; - -/** - * Semaphore used to grab a worker. - */ -static struct Semaphore worker_sem; - -/** - * Return value from main(). - */ -static int global_ret; - -/** - * Time when the key update is executed. - * Either the actual current time, or a pretended time. - */ -static struct GNUNET_TIME_Timestamp global_now; - -/** - * The time for the key update, as passed by the user - * on the command line. - */ -static struct GNUNET_TIME_Timestamp global_now_tmp; - -/** - * Where do we store the keys? - */ -static char *keydir; - -/** - * Name of the configuration section prefix to use. Usually either "taler-exchange" or - * "donau". The actual configuration section will then be - * "$SECTION-secmod-rsa". - */ -static char *section; - -/** - * How much should coin creation (@e duration_withdraw) duration overlap - * with the next denomination? Basically, the starting time of two - * denominations is always @e duration_withdraw - #overlap_duration apart. - */ -static struct GNUNET_TIME_Relative overlap_duration; - -/** - * How long into the future do we pre-generate keys? - */ -static struct GNUNET_TIME_Relative lookahead_sign; - -/** - * All of our denominations, in a DLL. Sorted? - */ -static struct Denomination *denom_head; - -/** - * All of our denominations, in a DLL. Sorted? - */ -static struct Denomination *denom_tail; - -/** - * Map of hashes of public (RSA) keys to `struct DenominationKey *` - * with the respective private keys. - */ -static struct GNUNET_CONTAINER_MultiHashMap *keys; - -/** - * Task run to generate new keys. - */ -static struct GNUNET_SCHEDULER_Task *keygen_task; - -/** - * Lock for the keys queue. - */ -static pthread_mutex_t keys_lock; - -/** - * Current key generation. - */ -static uint64_t key_gen; - -/** - * Number of workers to launch. Note that connections to - * exchanges are NOT workers. - */ -static unsigned int max_workers = 16; - - -/** - * Generate the announcement message for @a dk. - * - * @param[in,out] dk denomination key to generate the announcement for - */ -static void -generate_response (struct DenominationKey *dk) -{ - struct Denomination *denom = dk->denom; - size_t nlen = strlen (denom->section) + 1; - struct TALER_CRYPTO_RsaKeyAvailableNotification *an; - size_t buf_len; - void *buf; - void *p; - size_t tlen; - - buf_len = GNUNET_CRYPTO_rsa_public_key_encode (dk->denom_pub, - &buf); - GNUNET_assert (buf_len < UINT16_MAX); - GNUNET_assert (nlen < UINT16_MAX); - tlen = buf_len + nlen + sizeof (*an); - GNUNET_assert (tlen < UINT16_MAX); - an = GNUNET_malloc (tlen); - an->header.size = htons ((uint16_t) tlen); - an->header.type = htons (TALER_HELPER_RSA_MT_AVAIL); - an->pub_size = htons ((uint16_t) buf_len); - an->section_name_len = htons ((uint16_t) nlen); - an->anchor_time = GNUNET_TIME_timestamp_hton (dk->anchor); - an->duration_withdraw = GNUNET_TIME_relative_hton (denom->duration_withdraw); - TALER_exchange_secmod_rsa_sign (&dk->h_rsa, - denom->section, - dk->anchor, - denom->duration_withdraw, - &TES_smpriv, - &an->secm_sig); - an->secm_pub = TES_smpub; - p = (void *) &an[1]; - GNUNET_memcpy (p, - buf, - buf_len); - GNUNET_free (buf); - GNUNET_memcpy (p + buf_len, - denom->section, - nlen); - dk->an = an; -} - - -/** - * Do the actual signing work. - * - * @param h_rsa key to sign with - * @param bm blinded message to sign - * @param[out] rsa_signaturep set to the RSA signature - * @return #TALER_EC_NONE on success - */ -static enum TALER_ErrorCode -do_sign (const struct TALER_RsaPubHashP *h_rsa, - const struct GNUNET_CRYPTO_RsaBlindedMessage *bm, - struct GNUNET_CRYPTO_RsaSignature **rsa_signaturep) -{ - struct DenominationKey *dk; - struct GNUNET_CRYPTO_RsaSignature *rsa_signature; - struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get (); - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - dk = GNUNET_CONTAINER_multihashmap_get (keys, - &h_rsa->hash); - if (NULL == dk) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Signing request failed, denomination key %s unknown\n", - GNUNET_h2s (&h_rsa->hash)); - return TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN; - } - if (GNUNET_TIME_absolute_is_future (dk->anchor.abs_time)) - { - /* it is too early */ - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Signing request failed, denomination key %s is not yet valid\n", - GNUNET_h2s (&h_rsa->hash)); - return TALER_EC_EXCHANGE_DENOMINATION_HELPER_TOO_EARLY; - } - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Received request to sign over %u bytes with key %s\n", - (unsigned int) bm->blinded_msg_size, - GNUNET_h2s (&h_rsa->hash)); - GNUNET_assert (dk->rc < UINT_MAX); - dk->rc++; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - rsa_signature - = GNUNET_CRYPTO_rsa_sign_blinded (dk->denom_priv, - bm); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_assert (dk->rc > 0); - dk->rc--; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (NULL == rsa_signature) - { - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Signing request failed, worker failed to produce signature\n"); - return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE; - } - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Sending RSA signature after %s\n", - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_duration (now), - GNUNET_YES)); - *rsa_signaturep = rsa_signature; - return TALER_EC_NONE; -} - - -/** - * Generate error response that signing failed. - * - * @param client client to send response to - * @param ec error code to include - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -fail_sign (struct TES_Client *client, - enum TALER_ErrorCode ec) -{ - struct TALER_CRYPTO_SignFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_RSA_MT_RES_SIGN_FAILURE), - .ec = htonl (ec) - }; - - return TES_transmit (client->csock, - &sf.header); -} - - -/** - * Generate signature response. - * - * @param client client to send response to - * @param[in] rsa_signature signature to send, freed by this function - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -send_signature (struct TES_Client *client, - struct GNUNET_CRYPTO_RsaSignature *rsa_signature) -{ - struct TALER_CRYPTO_SignResponse *sr; - void *buf; - size_t buf_size; - size_t tsize; - enum GNUNET_GenericReturnValue ret; - - buf_size = GNUNET_CRYPTO_rsa_signature_encode (rsa_signature, - &buf); - GNUNET_CRYPTO_rsa_signature_free (rsa_signature); - tsize = sizeof (*sr) + buf_size; - GNUNET_assert (tsize < UINT16_MAX); - sr = GNUNET_malloc (tsize); - sr->header.size = htons (tsize); - sr->header.type = htons (TALER_HELPER_RSA_MT_RES_SIGNATURE); - GNUNET_memcpy (&sr[1], - buf, - buf_size); - GNUNET_free (buf); - ret = TES_transmit (client->csock, - &sr->header); - GNUNET_free (sr); - return ret; -} - - -/** - * Handle @a client request @a sr to create signature. Create the - * signature using the respective key and return the result to - * the client. - * - * @param client the client making the request - * @param sr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_sign_request (struct TES_Client *client, - const struct TALER_CRYPTO_SignRequest *sr) -{ - struct GNUNET_CRYPTO_RsaBlindedMessage bm = { - .blinded_msg = (void *) &sr[1], - .blinded_msg_size = ntohs (sr->header.size) - sizeof (*sr) - }; - struct GNUNET_CRYPTO_RsaSignature *rsa_signature; - enum TALER_ErrorCode ec; - - ec = do_sign (&sr->h_rsa, - &bm, - &rsa_signature); - if (TALER_EC_NONE != ec) - { - return fail_sign (client, - ec); - } - return send_signature (client, - rsa_signature); -} - - -/** - * Initialize a semaphore @a sem with a value of @a val. - * - * @param[out] sem semaphore to initialize - * @param val initial value of the semaphore - */ -static void -sem_init (struct Semaphore *sem, - unsigned int val) -{ - GNUNET_assert (0 == - pthread_mutex_init (&sem->mutex, - NULL)); - GNUNET_assert (0 == - pthread_cond_init (&sem->cv, - NULL)); - sem->ctr = val; -} - - -/** - * Decrement semaphore, blocks until this is possible. - * - * @param[in,out] sem semaphore to decrement - */ -static void -sem_down (struct Semaphore *sem) -{ - GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); - while (0 == sem->ctr) - { - pthread_cond_wait (&sem->cv, - &sem->mutex); - } - sem->ctr--; - GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); -} - - -/** - * Increment semaphore, blocks until this is possible. - * - * @param[in,out] sem semaphore to decrement - */ -static void -sem_up (struct Semaphore *sem) -{ - GNUNET_assert (0 == pthread_mutex_lock (&sem->mutex)); - sem->ctr++; - GNUNET_assert (0 == pthread_mutex_unlock (&sem->mutex)); - pthread_cond_signal (&sem->cv); -} - - -/** - * Release resources used by @a sem. - * - * @param[in] sem semaphore to release (except the memory itself) - */ -static void -sem_done (struct Semaphore *sem) -{ - GNUNET_break (0 == pthread_cond_destroy (&sem->cv)); - GNUNET_break (0 == pthread_mutex_destroy (&sem->mutex)); -} - - -/** - * Main logic of a worker thread. Grabs work, does it, - * grabs more work. - * - * @param cls a `struct Worker *` - * @returns cls - */ -static void * -worker (void *cls) -{ - struct Worker *w = cls; - - while (true) - { - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - GNUNET_CONTAINER_DLL_insert (worker_head, - worker_tail, - w); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - sem_up (&worker_sem); - sem_down (&w->sem); - if (w->do_shutdown) - break; - { - struct BatchJob *bj = w->job; - const struct TALER_CRYPTO_SignRequest *sr = bj->sr; - struct GNUNET_CRYPTO_RsaBlindedMessage bm = { - .blinded_msg = (void *) &sr[1], - .blinded_msg_size = ntohs (sr->header.size) - sizeof (*sr) - }; - - bj->ec = do_sign (&sr->h_rsa, - &bm, - &bj->rsa_signature); - sem_up (&bj->sem); - w->job = NULL; - } - } - return w; -} - - -/** - * Start batch job @a bj to sign @a sr. - * - * @param sr signature request to answer - * @param[out] bj job data structure - */ -static void -start_job (const struct TALER_CRYPTO_SignRequest *sr, - struct BatchJob *bj) -{ - sem_init (&bj->sem, - 0); - bj->sr = sr; - sem_down (&worker_sem); - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - bj->worker = worker_head; - GNUNET_CONTAINER_DLL_remove (worker_head, - worker_tail, - bj->worker); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - bj->worker->job = bj; - sem_up (&bj->worker->sem); -} - - -/** - * Finish a job @a bj for a @a client. - * - * @param client who made the request - * @param[in,out] bj job to finish - */ -static void -finish_job (struct TES_Client *client, - struct BatchJob *bj) -{ - sem_down (&bj->sem); - sem_done (&bj->sem); - if (TALER_EC_NONE != bj->ec) - { - fail_sign (client, - bj->ec); - return; - } - GNUNET_assert (NULL != bj->rsa_signature); - send_signature (client, - bj->rsa_signature); - bj->rsa_signature = NULL; /* freed in send_signature */ -} - - -/** - * Handle @a client request @a sr to create a batch of signature. Creates the - * signatures using the respective key and return the results to the client. - * - * @param client the client making the request - * @param bsr the request details - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -handle_batch_sign_request (struct TES_Client *client, - const struct TALER_CRYPTO_BatchSignRequest *bsr) -{ - uint32_t bs = ntohl (bsr->batch_size); - uint16_t size = ntohs (bsr->header.size) - sizeof (*bsr); - const void *off = (const void *) &bsr[1]; - unsigned int idx = 0; - struct BatchJob jobs[bs]; - bool failure = false; - - if (bs > TALER_MAX_FRESH_COINS) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - while ( (bs > 0) && - (size > sizeof (struct TALER_CRYPTO_SignRequest)) ) - { - const struct TALER_CRYPTO_SignRequest *sr = off; - uint16_t s = ntohs (sr->header.size); - - if (s > size) - { - failure = true; - bs = idx; - break; - } - start_job (sr, - &jobs[idx++]); - off += s; - size -= s; - } - GNUNET_break_op (0 == size); - bs = GNUNET_MIN (bs, - idx); - for (unsigned int i = 0; i<bs; i++) - finish_job (client, - &jobs[i]); - if (failure) - { - struct TALER_CRYPTO_SignFailure sf = { - .header.size = htons (sizeof (sf)), - .header.type = htons (TALER_HELPER_RSA_MT_RES_BATCH_FAILURE), - .ec = htonl (TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE) - }; - - GNUNET_break (0); - return TES_transmit (client->csock, - &sf.header); - } - return GNUNET_OK; -} - - -/** - * Start worker thread for batch processing. - * - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -start_worker (void) -{ - struct Worker *w; - - w = GNUNET_new (struct Worker); - sem_init (&w->sem, - 0); - if (0 != pthread_create (&w->pt, - NULL, - &worker, - w)) - { - GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, - "pthread_create"); - GNUNET_free (w); - return GNUNET_SYSERR; - } - workers++; - return GNUNET_OK; -} - - -/** - * Stop all worker threads. - */ -static void -stop_workers (void) -{ - while (workers > 0) - { - struct Worker *w; - void *result; - - sem_down (&worker_sem); - GNUNET_assert (0 == pthread_mutex_lock (&worker_lock)); - w = worker_head; - GNUNET_CONTAINER_DLL_remove (worker_head, - worker_tail, - w); - GNUNET_assert (0 == pthread_mutex_unlock (&worker_lock)); - w->do_shutdown = true; - sem_up (&w->sem); - pthread_join (w->pt, - &result); - GNUNET_assert (result == w); - sem_done (&w->sem); - GNUNET_free (w); - workers--; - } -} - - -/** - * Initialize key material for denomination key @a dk (also on disk). - * - * @param[in,out] dk denomination key to compute key material for - * @param position where in the DLL will the @a dk go - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -setup_key (struct DenominationKey *dk, - struct DenominationKey *position) -{ - struct Denomination *denom = dk->denom; - struct GNUNET_CRYPTO_RsaPrivateKey *priv; - struct GNUNET_CRYPTO_RsaPublicKey *pub; - size_t buf_size; - void *buf; - - priv = GNUNET_CRYPTO_rsa_private_key_create (denom->rsa_keysize); - if (NULL == priv) - { - GNUNET_break (0); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - pub = GNUNET_CRYPTO_rsa_private_key_get_public (priv); - if (NULL == pub) - { - GNUNET_break (0); - GNUNET_CRYPTO_rsa_private_key_free (priv); - return GNUNET_SYSERR; - } - buf_size = GNUNET_CRYPTO_rsa_private_key_encode (priv, - &buf); - GNUNET_CRYPTO_rsa_public_key_hash (pub, - &dk->h_rsa.hash); - GNUNET_asprintf (&dk->filename, - "%s/%s/%llu", - keydir, - denom->section, - (unsigned long long) (dk->anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us - )); - if (GNUNET_OK != - GNUNET_DISK_fn_write (dk->filename, - buf, - buf_size, - GNUNET_DISK_PERM_USER_READ)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "write", - dk->filename); - GNUNET_free (buf); - GNUNET_CRYPTO_rsa_private_key_free (priv); - GNUNET_CRYPTO_rsa_public_key_free (pub); - return GNUNET_SYSERR; - } - GNUNET_free (buf); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Setup fresh private key %s at %s in `%s' (generation #%llu)\n", - GNUNET_h2s (&dk->h_rsa.hash), - GNUNET_TIME_timestamp2s (dk->anchor), - dk->filename, - (unsigned long long) key_gen); - dk->denom_priv = priv; - dk->denom_pub = pub; - dk->key_gen = key_gen; - generate_response (dk); - if (GNUNET_OK != - GNUNET_CONTAINER_multihashmap_put ( - keys, - &dk->h_rsa.hash, - dk, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Duplicate private key created! Terminating.\n"); - GNUNET_CRYPTO_rsa_private_key_free (dk->denom_priv); - GNUNET_CRYPTO_rsa_public_key_free (dk->denom_pub); - GNUNET_free (dk->filename); - GNUNET_free (dk->an); - GNUNET_free (dk); - return GNUNET_SYSERR; - } - GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, - denom->keys_tail, - position, - dk); - return GNUNET_OK; -} - - -/** - * The withdraw period of a key @a dk has expired. Purge it. - * - * @param[in] dk expired denomination key to purge - */ -static void -purge_key (struct DenominationKey *dk) -{ - if (dk->purge) - return; - if (0 != unlink (dk->filename)) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - dk->filename); - GNUNET_free (dk->filename); - dk->purge = true; - dk->key_gen = key_gen; -} - - -/** - * A @a client informs us that a key has been revoked. - * Check if the key is still in use, and if so replace (!) - * it with a fresh key. - * - * @param client the client making the request - * @param rr the revocation request - */ -static enum GNUNET_GenericReturnValue -handle_revoke_request (struct TES_Client *client, - const struct TALER_CRYPTO_RevokeRequest *rr) -{ - struct DenominationKey *dk; - struct DenominationKey *ndk; - struct Denomination *denom; - - (void) client; - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - dk = GNUNET_CONTAINER_multihashmap_get (keys, - &rr->h_rsa.hash); - if (NULL == dk) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, denomination key %s unknown\n", - GNUNET_h2s (&rr->h_rsa.hash)); - return GNUNET_OK; - } - if (dk->purge) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Revocation request ignored, denomination key %s already revoked\n", - GNUNET_h2s (&rr->h_rsa.hash)); - return GNUNET_OK; - } - - key_gen++; - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Revoking key %s, bumping generation to %llu\n", - GNUNET_h2s (&rr->h_rsa.hash), - (unsigned long long) key_gen); - purge_key (dk); - - /* Setup replacement key */ - denom = dk->denom; - ndk = GNUNET_new (struct DenominationKey); - ndk->denom = denom; - ndk->anchor = dk->anchor; - if (GNUNET_OK != - setup_key (ndk, - dk)) - { - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_break (0); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - TES_wake_clients (); - return GNUNET_OK; -} - - -/** - * Handle @a hdr message received from @a client. - * - * @param client the client that received the message - * @param hdr message that was received - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -rsa_work_dispatch (struct TES_Client *client, - const struct GNUNET_MessageHeader *hdr) -{ - uint16_t msize = ntohs (hdr->size); - - switch (ntohs (hdr->type)) - { - case TALER_HELPER_RSA_MT_REQ_SIGN: - if (msize <= sizeof (struct TALER_CRYPTO_SignRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_sign_request ( - client, - (const struct TALER_CRYPTO_SignRequest *) hdr); - case TALER_HELPER_RSA_MT_REQ_REVOKE: - if (msize != sizeof (struct TALER_CRYPTO_RevokeRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_revoke_request ( - client, - (const struct TALER_CRYPTO_RevokeRequest *) hdr); - case TALER_HELPER_RSA_MT_REQ_BATCH_SIGN: - if (msize <= sizeof (struct TALER_CRYPTO_BatchSignRequest)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - return handle_batch_sign_request ( - client, - (const struct TALER_CRYPTO_BatchSignRequest *) hdr); - default: - GNUNET_break_op (0); - return GNUNET_SYSERR; - } -} - - -/** - * Send our initial key set to @a client together with the - * "sync" terminator. - * - * @param client the client to inform - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -rsa_client_init (struct TES_Client *client) -{ - size_t obs = 0; - char *buf; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Initializing new client %p\n", - client); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *dk = denom->keys_head; - NULL != dk; - dk = dk->next) - { - GNUNET_assert (obs + ntohs (dk->an->header.size) - > obs); - obs += ntohs (dk->an->header.size); - } - } - buf = GNUNET_malloc (obs); - obs = 0; - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *dk = denom->keys_head; - NULL != dk; - dk = dk->next) - { - GNUNET_memcpy (&buf[obs], - dk->an, - ntohs (dk->an->header.size)); - GNUNET_assert (obs + ntohs (dk->an->header.size) - > obs); - obs += ntohs (dk->an->header.size); - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (GNUNET_OK != - TES_transmit_raw (client->csock, - obs, - buf)) - { - GNUNET_free (buf); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Client %p must have disconnected\n", - client); - return GNUNET_SYSERR; - } - GNUNET_free (buf); - { - struct GNUNET_MessageHeader synced = { - .type = htons (TALER_HELPER_RSA_SYNCED), - .size = htons (sizeof (synced)) - }; - - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Sending RSA SYNCED message to %p\n", - client); - if (GNUNET_OK != - TES_transmit (client->csock, - &synced)) - { - GNUNET_break (0); - return GNUNET_SYSERR; - } - } - return GNUNET_OK; -} - - -/** - * Notify @a client about all changes to the keys since - * the last generation known to the @a client. - * - * @param client the client to notify - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -rsa_update_client_keys (struct TES_Client *client) -{ - size_t obs = 0; - char *buf; - enum GNUNET_GenericReturnValue ret; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *key = denom->keys_head; - NULL != key; - key = key->next) - { - if (key->key_gen <= client->key_gen) - continue; - if (key->purge) - obs += sizeof (struct TALER_CRYPTO_RsaKeyPurgeNotification); - else - obs += ntohs (key->an->header.size); - } - } - if (0 == obs) - { - /* nothing to do */ - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - return GNUNET_OK; - } - buf = GNUNET_malloc (obs); - obs = 0; - for (struct Denomination *denom = denom_head; - NULL != denom; - denom = denom->next) - { - for (struct DenominationKey *key = denom->keys_head; - NULL != key; - key = key->next) - { - if (key->key_gen <= client->key_gen) - continue; - if (key->purge) - { - struct TALER_CRYPTO_RsaKeyPurgeNotification pn = { - .header.type = htons (TALER_HELPER_RSA_MT_PURGE), - .header.size = htons (sizeof (pn)), - .h_rsa = key->h_rsa - }; - - GNUNET_memcpy (&buf[obs], - &pn, - sizeof (pn)); - GNUNET_assert (obs + sizeof (pn) - > obs); - obs += sizeof (pn); - } - else - { - GNUNET_memcpy (&buf[obs], - key->an, - ntohs (key->an->header.size)); - GNUNET_assert (obs + ntohs (key->an->header.size) - > obs); - obs += ntohs (key->an->header.size); - } - } - } - client->key_gen = key_gen; - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - ret = TES_transmit_raw (client->csock, - obs, - buf); - GNUNET_free (buf); - return ret; -} - - -/** - * Create a new denomination key (we do not have enough). - * - * @param denom denomination key to create - * @param now current time to use (to get many keys to use the exact same time) - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -create_key (struct Denomination *denom, - struct GNUNET_TIME_Timestamp now) -{ - struct DenominationKey *dk; - struct GNUNET_TIME_Timestamp anchor; - - anchor = now; - // FIXME: round down to multiple of 'anchor_round' value from configuration - if (NULL != denom->keys_tail) - { - struct GNUNET_TIME_Absolute abs; - - abs = GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, - GNUNET_TIME_relative_subtract ( - denom->duration_withdraw, - overlap_duration)); - if (GNUNET_TIME_absolute_cmp (now.abs_time, <, abs)) - anchor = GNUNET_TIME_absolute_to_timestamp (abs); - } - dk = GNUNET_new (struct DenominationKey); - dk->denom = denom; - dk->anchor = anchor; - if (GNUNET_OK != - setup_key (dk, - denom->keys_tail)) - { - GNUNET_break (0); - GNUNET_free (dk); - GNUNET_SCHEDULER_shutdown (); - global_ret = EXIT_FAILURE; - return GNUNET_SYSERR; - } - return GNUNET_OK; -} - - -/** - * At what time does this denomination require its next action? - * Basically, the minimum of the withdraw expiration time of the - * oldest denomination key, and the withdraw expiration time of - * the newest denomination key minus the #lookahead_sign time. - * - * @param denom denomination to compute action time for - */ -static struct GNUNET_TIME_Absolute -denomination_action_time (const struct Denomination *denom) -{ - struct DenominationKey *head = denom->keys_head; - struct DenominationKey *tail = denom->keys_tail; - struct GNUNET_TIME_Absolute tt; - - if (NULL == head) - return GNUNET_TIME_UNIT_ZERO_ABS; - tt = GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (tail->anchor.abs_time, - denom->duration_withdraw), - lookahead_sign), - overlap_duration); - if (head->rc > 0) - return tt; /* head expiration does not count due to rc > 0 */ - return GNUNET_TIME_absolute_min ( - GNUNET_TIME_absolute_add (head->anchor.abs_time, - denom->duration_withdraw), - tt); -} - - -/** - * Create new keys and expire ancient keys of the given denomination @a denom. - * Removes the @a denom from the #denom_head DLL and re-insert its at the - * correct location sorted by next maintenance activity. - * - * @param[in,out] denom denomination to update material for - * @param now current time to use (to get many keys to use the exact same time) - * @param[in,out] wake set to true if we should wake the clients - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -update_keys (struct Denomination *denom, - struct GNUNET_TIME_Timestamp now, - bool *wake) -{ - /* create new denomination keys */ - if (NULL != denom->keys_tail) - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Updating keys of denomination `%s', last key %s valid for another %s\n", - denom->section, - GNUNET_h2s (&denom->keys_tail->h_rsa.hash), - GNUNET_TIME_relative2s ( - GNUNET_TIME_absolute_get_remaining ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add ( - denom->keys_tail->anchor.abs_time, - denom->duration_withdraw), - overlap_duration)), - GNUNET_YES)); - while ( (NULL == denom->keys_tail) || - GNUNET_TIME_absolute_is_past ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_subtract ( - GNUNET_TIME_absolute_add (denom->keys_tail->anchor.abs_time, - denom->duration_withdraw), - lookahead_sign), - overlap_duration)) ) - { - if (! *wake) - { - key_gen++; - *wake = true; - } - if (GNUNET_OK != - create_key (denom, - now)) - { - GNUNET_break (0); - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return GNUNET_SYSERR; - } - } - /* remove expired denomination keys */ - while ( (NULL != denom->keys_head) && - GNUNET_TIME_absolute_is_past - (GNUNET_TIME_absolute_add (denom->keys_head->anchor.abs_time, - denom->duration_withdraw)) ) - { - struct DenominationKey *key = denom->keys_head; - struct DenominationKey *nxt = key->next; - - if (0 != key->rc) - break; /* later */ - GNUNET_CONTAINER_DLL_remove (denom->keys_head, - denom->keys_tail, - key); - GNUNET_assert (GNUNET_OK == - GNUNET_CONTAINER_multihashmap_remove ( - keys, - &key->h_rsa.hash, - key)); - if ( (! key->purge) && - (0 != unlink (key->filename)) ) - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, - "unlink", - key->filename); - GNUNET_free (key->filename); - GNUNET_CRYPTO_rsa_private_key_free (key->denom_priv); - GNUNET_CRYPTO_rsa_public_key_free (key->denom_pub); - GNUNET_free (key->an); - GNUNET_free (key); - key = nxt; - } - - /* Update position of 'denom' in #denom_head DLL: sort by action time */ - { - struct Denomination *before; - struct GNUNET_TIME_Absolute at; - - at = denomination_action_time (denom); - GNUNET_CONTAINER_DLL_remove (denom_head, - denom_tail, - denom); - before = NULL; - for (struct Denomination *pos = denom_head; - NULL != pos; - pos = pos->next) - { - if (GNUNET_TIME_absolute_cmp (denomination_action_time (pos), >=, at)) - break; - before = pos; - } - GNUNET_CONTAINER_DLL_insert_after (denom_head, - denom_tail, - before, - denom); - } - return GNUNET_OK; -} - - -/** - * Task run periodically to expire keys and/or generate fresh ones. - * - * @param cls NULL - */ -static void -update_denominations (void *cls) -{ - struct Denomination *denom; - struct GNUNET_TIME_Absolute now; - struct GNUNET_TIME_Timestamp t; - bool wake = false; - - (void) cls; - keygen_task = NULL; - now = GNUNET_TIME_absolute_get (); - t = GNUNET_TIME_absolute_to_timestamp (now); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Updating denominations ...\n"); - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - do { - denom = denom_head; - if (GNUNET_OK != - update_keys (denom, - t, - &wake)) - return; - } while (denom != denom_head); - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "Updating denominations finished ...\n"); - if (wake) - TES_wake_clients (); - keygen_task = GNUNET_SCHEDULER_add_at (denomination_action_time (denom), - &update_denominations, - NULL); -} - - -/** - * Parse private key of denomination @a denom in @a buf. - * - * @param[out] denom denomination of the key - * @param filename name of the file we are parsing, for logging - * @param buf key material - * @param buf_size number of bytes in @a buf - */ -static void -parse_key (struct Denomination *denom, - const char *filename, - const void *buf, - size_t buf_size) -{ - struct GNUNET_CRYPTO_RsaPrivateKey *priv; - char *anchor_s; - char dummy; - unsigned long long anchor_ll; - struct GNUNET_TIME_Timestamp anchor; - - anchor_s = strrchr (filename, - '/'); - if (NULL == anchor_s) - { - /* File in a directory without '/' in the name, this makes no sense. */ - GNUNET_break (0); - return; - } - anchor_s++; - if (1 != sscanf (anchor_s, - "%llu%c", - &anchor_ll, - &dummy)) - { - /* Filenames in KEYDIR must ONLY be the anchor time in seconds! */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return; - } - anchor.abs_time.abs_value_us - = anchor_ll * GNUNET_TIME_UNIT_SECONDS.rel_value_us; - if (anchor_ll != anchor.abs_time.abs_value_us - / GNUNET_TIME_UNIT_SECONDS.rel_value_us) - { - /* Integer overflow. Bad, invalid filename. */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "Filename `%s' invalid for key file, skipping\n", - filename); - return; - } - priv = GNUNET_CRYPTO_rsa_private_key_decode (buf, - buf_size); - if (NULL == priv) - { - /* Parser failure. */ - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "File `%s' is malformed, skipping\n", - filename); - return; - } - - { - struct GNUNET_CRYPTO_RsaPublicKey *pub; - struct DenominationKey *dk; - struct DenominationKey *before; - - pub = GNUNET_CRYPTO_rsa_private_key_get_public (priv); - if (NULL == pub) - { - GNUNET_break (0); - GNUNET_CRYPTO_rsa_private_key_free (priv); - return; - } - dk = GNUNET_new (struct DenominationKey); - dk->denom_priv = priv; - dk->denom = denom; - dk->anchor = anchor; - dk->filename = GNUNET_strdup (filename); - GNUNET_CRYPTO_rsa_public_key_hash (pub, - &dk->h_rsa.hash); - dk->denom_pub = pub; - generate_response (dk); - if (GNUNET_OK != - GNUNET_CONTAINER_multihashmap_put ( - keys, - &dk->h_rsa.hash, - dk, - GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Duplicate private key %s detected in file `%s'. Skipping.\n", - GNUNET_h2s (&dk->h_rsa.hash), - filename); - GNUNET_CRYPTO_rsa_private_key_free (priv); - GNUNET_CRYPTO_rsa_public_key_free (pub); - GNUNET_free (dk->an); - GNUNET_free (dk); - return; - } - before = NULL; - for (struct DenominationKey *pos = denom->keys_head; - NULL != pos; - pos = pos->next) - { - if (GNUNET_TIME_timestamp_cmp (pos->anchor, - >, - anchor)) - break; - before = pos; - } - GNUNET_CONTAINER_DLL_insert_after (denom->keys_head, - denom->keys_tail, - before, - dk); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Imported key %s from `%s'\n", - GNUNET_h2s (&dk->h_rsa.hash), - filename); - } -} - - -/** - * Import a private key from @a filename for the denomination - * given in @a cls. - * - * @param[in,out] cls a `struct Denomiantion` - * @param filename name of a file in the directory - * @return #GNUNET_OK (always, continue to iterate) - */ -static enum GNUNET_GenericReturnValue -import_key (void *cls, - const char *filename) -{ - struct Denomination *denom = cls; - struct GNUNET_DISK_FileHandle *fh; - struct GNUNET_DISK_MapHandle *map; - void *ptr; - int fd; - struct stat sbuf; - - { - struct stat lsbuf; - - if (0 != lstat (filename, - &lsbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "lstat", - filename); - return GNUNET_OK; - } - if (! S_ISREG (lsbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - return GNUNET_OK; - } - } - - fd = open (filename, - O_RDONLY | O_CLOEXEC); - if (-1 == fd) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - return GNUNET_OK; - } - if (0 != fstat (fd, - &sbuf)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "stat", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (! S_ISREG (sbuf.st_mode)) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' is not a regular file, which is not allowed for private keys!\n", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (0 != (sbuf.st_mode & (S_IWUSR | S_IRWXG | S_IRWXO))) - { - /* permission are NOT tight, try to patch them up! */ - if (0 != - fchmod (fd, - S_IRUSR)) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "fchmod", - filename); - /* refuse to use key if file has wrong permissions */ - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - } - fh = GNUNET_DISK_get_handle_from_int_fd (fd); - if (NULL == fh) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "open", - filename); - GNUNET_break (0 == close (fd)); - return GNUNET_OK; - } - if (sbuf.st_size > 16 * 1024) - { - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "File `%s' too big to be a private key\n", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - ptr = GNUNET_DISK_file_map (fh, - &map, - GNUNET_DISK_MAP_TYPE_READ, - (size_t) sbuf.st_size); - if (NULL == ptr) - { - GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, - "mmap", - filename); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; - } - parse_key (denom, - filename, - ptr, - (size_t) sbuf.st_size); - GNUNET_DISK_file_unmap (map); - GNUNET_DISK_file_close (fh); - return GNUNET_OK; -} - - -/** - * Parse configuration for denomination type parameters. Also determines - * our anchor by looking at the existing denominations of the same type. - * - * @param cfg configuration to use - * @param ct section in the configuration file giving the denomination type parameters - * @param[out] denom set to the denomination parameters from the configuration - * @return #GNUNET_OK on success, #GNUNET_SYSERR if the configuration is invalid - */ -static enum GNUNET_GenericReturnValue -parse_denomination_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg, - const char *ct, - struct Denomination *denom) -{ - unsigned long long rsa_keysize; - char *secname; - - GNUNET_asprintf (&secname, - "%s-secmod-rsa", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - ct, - "DURATION_WITHDRAW", - &denom->duration_withdraw)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - ct, - "DURATION_WITHDRAW"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if (GNUNET_TIME_relative_cmp (overlap_duration, - >=, - denom->duration_withdraw)) - { - GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, - section, - "OVERLAP_DURATION", - "Value given must be smaller than value for DURATION_WITHDRAW!"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_number (cfg, - ct, - "RSA_KEYSIZE", - &rsa_keysize)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - ct, - "RSA_KEYSIZE"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if ( (rsa_keysize > 4 * 2048) || - (rsa_keysize < 1024) ) - { - GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, - ct, - "RSA_KEYSIZE", - "Given RSA keysize outside of permitted range [1024,8192]\n"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - GNUNET_free (secname); - denom->rsa_keysize = (unsigned int) rsa_keysize; - denom->section = GNUNET_strdup (ct); - return GNUNET_OK; -} - - -/** - * Closure for #load_denominations. - */ -struct LoadContext -{ - - /** - * Configuration to use. - */ - const struct GNUNET_CONFIGURATION_Handle *cfg; - - /** - * Current time to use. - */ - struct GNUNET_TIME_Timestamp t; - - /** - * Status, to be set to #GNUNET_SYSERR on failure - */ - enum GNUNET_GenericReturnValue ret; -}; - - -/** - * Generate new denomination signing keys for the denomination type of the given @a - * denomination_alias. - * - * @param cls a `struct LoadContext`, with 'ret' to be set to #GNUNET_SYSERR on failure - * @param denomination_alias name of the denomination's section in the configuration - */ -static void -load_denominations (void *cls, - const char *denomination_alias) -{ - struct LoadContext *ctx = cls; - struct Denomination *denom; - bool wake = true; - char *cipher; - - if ( (0 != strncasecmp (denomination_alias, - "coin_", - strlen ("coin_"))) && - (0 != strncasecmp (denomination_alias, - "coin-", - strlen ("coin-"))) ) - return; /* not a denomination type definition */ - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_string (ctx->cfg, - denomination_alias, - "CIPHER", - &cipher)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - denomination_alias, - "CIPHER"); - return; - } - if (0 != strcmp (cipher, "RSA")) - { - GNUNET_free (cipher); - return; /* Ignore denominations of other types than CS */ - } - GNUNET_free (cipher); - denom = GNUNET_new (struct Denomination); - if (GNUNET_OK != - parse_denomination_cfg (ctx->cfg, - denomination_alias, - denom)) - { - ctx->ret = GNUNET_SYSERR; - GNUNET_free (denom); - return; - } - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Loading keys for denomination %s\n", - denom->section); - { - char *dname; - - GNUNET_asprintf (&dname, - "%s/%s", - keydir, - denom->section); - GNUNET_break (GNUNET_OK == - GNUNET_DISK_directory_create (dname)); - GNUNET_DISK_directory_scan (dname, - &import_key, - denom); - GNUNET_free (dname); - } - GNUNET_CONTAINER_DLL_insert (denom_head, - denom_tail, - denom); - update_keys (denom, - ctx->t, - &wake); -} - - -/** - * Load the various duration values from @a cfg - * - * @param cfg configuration to use - * @return #GNUNET_OK on success - */ -static enum GNUNET_GenericReturnValue -load_durations (const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - char *secname; - - GNUNET_asprintf (&secname, - "%s-secmod-rsa", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "OVERLAP_DURATION", - &overlap_duration)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "OVERLAP_DURATION"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_time (cfg, - secname, - "LOOKAHEAD_SIGN", - &lookahead_sign)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "LOOKAHEAD_SIGN"); - GNUNET_free (secname); - return GNUNET_SYSERR; - } - GNUNET_free (secname); - return GNUNET_OK; -} - - -/** - * Function run on shutdown. Stops the various jobs (nicely). - * - * @param cls NULL - */ -static void -do_shutdown (void *cls) -{ - (void) cls; - TES_listen_stop (); - if (NULL != keygen_task) - { - GNUNET_SCHEDULER_cancel (keygen_task); - keygen_task = NULL; - } - stop_workers (); - sem_done (&worker_sem); -} - - -/** - * Main function that will be run under the GNUnet scheduler. - * - * @param cls closure - * @param args remaining command-line arguments - * @param cfgfile name of the configuration file used (for saving, can be NULL!) - * @param cfg configuration - */ -static void -run (void *cls, - char *const *args, - const char *cfgfile, - const struct GNUNET_CONFIGURATION_Handle *cfg) -{ - static struct TES_Callbacks cb = { - .dispatch = rsa_work_dispatch, - .updater = rsa_update_client_keys, - .init = rsa_client_init - }; - char *secname; - - (void) cls; - (void) args; - (void) cfgfile; - if (GNUNET_TIME_timestamp_cmp (global_now, - !=, - global_now_tmp)) - { - /* The user gave "--now", use it! */ - global_now = global_now_tmp; - } - else - { - /* get current time again, we may be timetraveling! */ - global_now = GNUNET_TIME_timestamp_get (); - } - GNUNET_asprintf (&secname, - "%s-secmod-rsa", - section); - if (GNUNET_OK != - GNUNET_CONFIGURATION_get_value_filename (cfg, - secname, - "KEY_DIR", - &keydir)) - { - GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, - secname, - "KEY_DIR"); - GNUNET_free (secname); - global_ret = EXIT_NOTCONFIGURED; - return; - } - if (GNUNET_OK != - load_durations (cfg)) - { - global_ret = EXIT_NOTCONFIGURED; - GNUNET_free (secname); - return; - } - GNUNET_asprintf (&secname, - "%s-secmod-rsa", - section); - global_ret = TES_listen_start (cfg, - secname, - &cb); - GNUNET_free (secname); - if (0 != global_ret) - return; - sem_init (&worker_sem, - 0); - GNUNET_SCHEDULER_add_shutdown (&do_shutdown, - NULL); - if (0 == max_workers) - { - long lret; - - lret = sysconf (_SC_NPROCESSORS_CONF); - if (lret <= 0) - lret = 1; - max_workers = (unsigned int) lret; - } - - for (unsigned int i = 0; i<max_workers; i++) - if (GNUNET_OK != - start_worker ()) - { - GNUNET_SCHEDULER_shutdown (); - return; - } - /* Load denominations */ - keys = GNUNET_CONTAINER_multihashmap_create (65536, - GNUNET_YES); - { - struct LoadContext lc = { - .cfg = cfg, - .ret = GNUNET_OK, - .t = global_now - }; - - GNUNET_assert (0 == pthread_mutex_lock (&keys_lock)); - GNUNET_CONFIGURATION_iterate_sections (cfg, - &load_denominations, - &lc); - GNUNET_assert (0 == pthread_mutex_unlock (&keys_lock)); - if (GNUNET_OK != lc.ret) - { - global_ret = EXIT_FAILURE; - GNUNET_SCHEDULER_shutdown (); - return; - } - } - if (NULL == denom_head) - { - GNUNET_log (GNUNET_ERROR_TYPE_WARNING, - "No RSA denominations configured\n"); - TES_wake_clients (); - return; - } - /* start job to keep keys up-to-date; MUST be run before the #listen_task, - hence with priority. */ - keygen_task = GNUNET_SCHEDULER_add_with_priority ( - GNUNET_SCHEDULER_PRIORITY_URGENT, - &update_denominations, - NULL); -} /** @@ -2088,44 +46,31 @@ int main (int argc, char **argv) { + struct TALER_SECMOD_Options opts = { + .max_workers = 16, + .section = "taler-exchange" + }; struct GNUNET_GETOPT_CommandLineOption options[] = { - GNUNET_GETOPT_option_string ('s', - "section", - "SECTION", - "name of the configuration section prefix to use, default is 'taler'", - §ion), - GNUNET_GETOPT_option_timetravel ('T', - "timetravel"), - GNUNET_GETOPT_option_timestamp ('t', - "time", - "TIMESTAMP", - "pretend it is a different time for the update", - &global_now_tmp), - GNUNET_GETOPT_option_uint ('w', - "workers", - "COUNT", - "use COUNT workers for parallel processing of batch requests", - &max_workers), + TALER_SECMOD_OPTIONS (&opts), GNUNET_GETOPT_OPTION_END }; enum GNUNET_GenericReturnValue ret; /* Restrict permissions for the key files that we create. */ (void) umask (S_IWGRP | S_IROTH | S_IWOTH | S_IXOTH); - section = GNUNET_strdup ("taler-exchange"); - global_now_tmp - = global_now + opts.global_now_tmp + = opts.global_now = GNUNET_TIME_timestamp_get (); ret = GNUNET_PROGRAM_run (TALER_EXCHANGE_project_data (), argc, argv, "taler-exchange-secmod-rsa", "Handle private RSA key operations for a Taler exchange", options, - &run, - NULL); + &TALER_SECMOD_rsa_run, + &opts); if (GNUNET_NO == ret) return EXIT_SUCCESS; if (GNUNET_SYSERR == ret) return EXIT_INVALIDARGUMENT; - return global_ret; + return opts.global_ret; } |