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authorChristian Grothoff <christian@grothoff.org>2016-03-01 15:35:04 +0100
committerChristian Grothoff <christian@grothoff.org>2016-03-01 15:35:04 +0100
commitb5cba3251053c22bf1df46282f1dd0a4c46f6a38 (patch)
treeb7495c3e47c40c57ff81045a4e43aa07a3b6c7b1 /src/exchange-tools/taler-exchange-keyup.c
parente406833eab7ca0835f9779abebada94592a85a7e (diff)
renaming mint->exchange
Diffstat (limited to 'src/exchange-tools/taler-exchange-keyup.c')
-rw-r--r--src/exchange-tools/taler-exchange-keyup.c1039
1 files changed, 1039 insertions, 0 deletions
diff --git a/src/exchange-tools/taler-exchange-keyup.c b/src/exchange-tools/taler-exchange-keyup.c
new file mode 100644
index 000000000..779e3a3d3
--- /dev/null
+++ b/src/exchange-tools/taler-exchange-keyup.c
@@ -0,0 +1,1039 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014, 2015 GNUnet e.V.
+
+ 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, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-exchange-keyup.c
+ * @brief Update the exchange's keys for coins and signatures,
+ * using the exchange's offline master key.
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Christian Grothoff
+ */
+#include <platform.h>
+#include "taler_exchangedb_lib.h"
+
+/**
+ * When generating filenames from a cryptographic hash, we do not use
+ * all 512 bits but cut off after this number of characters (in
+ * base32-encoding). Base32 is 5 bit per character, and given that we
+ * have very few coin types we hash, at 100 bits the chance of
+ * collision (by accident over tiny set -- birthday paradox does not
+ * apply here!) is negligible.
+ */
+#define HASH_CUTOFF 20
+
+
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Struct with all of the key information for a kind of coin. Hashed
+ * to generate a unique directory name per coin type.
+ */
+struct CoinTypeNBOP
+{
+ /**
+ * How long are the signatures legally valid?
+ */
+ struct GNUNET_TIME_RelativeNBO duration_legal;
+
+ /**
+ * How long can the coin be spend?
+ */
+ struct GNUNET_TIME_RelativeNBO duration_spend;
+
+ /**
+ * How long can the coin be withdrawn (generated)?
+ */
+ struct GNUNET_TIME_RelativeNBO duration_withdraw;
+
+ /**
+ * What is the value of the coin?
+ */
+ struct TALER_AmountNBO value;
+
+ /**
+ * What is the fee charged for withdrawl?
+ */
+ struct TALER_AmountNBO fee_withdraw;
+
+ /**
+ * What is the fee charged for deposits?
+ */
+ struct TALER_AmountNBO fee_deposit;
+
+ /**
+ * What is the fee charged for melting?
+ */
+ struct TALER_AmountNBO fee_refresh;
+
+ /**
+ * Key size in NBO.
+ */
+ uint32_t rsa_keysize;
+};
+
+GNUNET_NETWORK_STRUCT_END
+
+/**
+ * Set of all of the parameters that chracterize a coin.
+ */
+struct CoinTypeParams
+{
+
+ /**
+ * How long are the signatures legally valid? Should be
+ * significantly larger than @e duration_spend (i.e. years).
+ */
+ struct GNUNET_TIME_Relative duration_legal;
+
+
+ /**
+ * How long can the coin be spend? Should be significantly
+ * larger than @e duration_withdraw (i.e. years).
+ */
+ struct GNUNET_TIME_Relative duration_spend;
+
+ /**
+ * How long can the coin 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;
+
+ /**
+ * How much should coin creation (@e duration_withdraw) duration
+ * overlap with the next coin? Basically, the starting time of two
+ * coins is always @e duration_withdraw - @e duration_overlap apart.
+ */
+ struct GNUNET_TIME_Relative duration_overlap;
+
+ /**
+ * What is the value of the coin?
+ */
+ struct TALER_Amount value;
+
+ /**
+ * What is the fee charged for withdrawl?
+ */
+ struct TALER_Amount fee_withdraw;
+
+ /**
+ * What is the fee charged for deposits?
+ */
+ struct TALER_Amount fee_deposit;
+
+ /**
+ * What is the fee charged for melting?
+ */
+ struct TALER_Amount fee_refresh;
+
+ /**
+ * Time at which this coin is supposed to become valid.
+ */
+ struct GNUNET_TIME_Absolute anchor;
+
+ /**
+ * Length of the RSA key in bits.
+ */
+ uint32_t rsa_keysize;
+};
+
+
+/**
+ * Filename of the master private key.
+ */
+static char *masterkeyfile;
+
+/**
+ * Filename where to write denomination key signing
+ * requests for the auditor (optional, can be NULL).
+ */
+static char *auditorrequestfile;
+
+/**
+ * Handle for writing the output for the auditor.
+ */
+static FILE *auditor_output_file;
+
+/**
+ * Director of the exchange, containing the keys.
+ */
+static char *exchange_directory;
+
+/**
+ * Time to pretend when the key update is executed.
+ */
+static char *pretend_time_str;
+
+/**
+ * Handle to the exchange's configuration
+ */
+static struct GNUNET_CONFIGURATION_Handle *kcfg;
+
+/**
+ * Time when the key update is executed. Either the actual current time, or a
+ * pretended time.
+ */
+static struct GNUNET_TIME_Absolute now;
+
+/**
+ * Master private key of the exchange.
+ */
+static struct TALER_MasterPrivateKeyP master_priv;
+
+/**
+ * Master public key of the exchange.
+ */
+static struct TALER_MasterPublicKeyP master_public_key;
+
+/**
+ * Until what time do we provide keys?
+ */
+static struct GNUNET_TIME_Absolute lookahead_sign_stamp;
+
+
+/**
+ * Obtain the name of the directory we use to store signing
+ * keys created at time @a start.
+ *
+ * @param start time at which we create the signing key
+ * @return name of the directory we should use, basically "$EXCHANGEDIR/$TIME/";
+ * (valid until next call to this function)
+ */
+static const char *
+get_signkey_file (struct GNUNET_TIME_Absolute start)
+{
+ static char dir[4096];
+
+ GNUNET_snprintf (dir,
+ sizeof (dir),
+ "%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS DIR_SEPARATOR_STR "%llu",
+ exchange_directory,
+ (unsigned long long) start.abs_value_us);
+ return dir;
+}
+
+
+/**
+ * Hash the data defining the coin type. Exclude information that may
+ * not be the same for all instances of the coin type (i.e. the
+ * anchor, overlap).
+ *
+ * @param p coin parameters to convert to a hash
+ * @param[out] hash set to the hash matching @a p
+ */
+static void
+hash_coin_type (const struct CoinTypeParams *p,
+ struct GNUNET_HashCode *hash)
+{
+ struct CoinTypeNBOP p_nbo;
+
+ memset (&p_nbo,
+ 0,
+ sizeof (struct CoinTypeNBOP));
+ p_nbo.duration_spend = GNUNET_TIME_relative_hton (p->duration_spend);
+ p_nbo.duration_legal = GNUNET_TIME_relative_hton (p->duration_legal);
+ p_nbo.duration_withdraw = GNUNET_TIME_relative_hton (p->duration_withdraw);
+ TALER_amount_hton (&p_nbo.value,
+ &p->value);
+ TALER_amount_hton (&p_nbo.fee_withdraw,
+ &p->fee_withdraw);
+ TALER_amount_hton (&p_nbo.fee_deposit,
+ &p->fee_deposit);
+ TALER_amount_hton (&p_nbo.fee_refresh,
+ &p->fee_refresh);
+ p_nbo.rsa_keysize = htonl (p->rsa_keysize);
+ GNUNET_CRYPTO_hash (&p_nbo,
+ sizeof (struct CoinTypeNBOP),
+ hash);
+}
+
+
+/**
+ * Obtain the name of the directory we should use to store coins of
+ * the given type. The directory name has the format
+ * "$EXCHANGEDIR/$VALUE/$HASH/" where "$VALUE" represents the value of the
+ * coin and "$HASH" encodes all of the coin's parameters, generating a
+ * unique string for each type of coin. Note that the "$HASH"
+ * includes neither the absolute creation time nor the key of the
+ * coin, thus the files in the subdirectory really just refer to the
+ * same type of coins, not the same coin.
+ *
+ * @param p coin parameters to convert to a directory name
+ * @return directory name (valid until next call to this function)
+ */
+static const char *
+get_cointype_dir (const struct CoinTypeParams *p)
+{
+ static char dir[4096];
+ struct GNUNET_HashCode hash;
+ char *hash_str;
+ char *val_str;
+ size_t i;
+
+ hash_coin_type (p, &hash);
+ hash_str = GNUNET_STRINGS_data_to_string_alloc (&hash,
+ sizeof (struct GNUNET_HashCode));
+ GNUNET_assert (NULL != hash_str);
+ GNUNET_assert (HASH_CUTOFF <= strlen (hash_str) + 1);
+ hash_str[HASH_CUTOFF] = 0;
+
+ val_str = TALER_amount_to_string (&p->value);
+ for (i = 0; i < strlen (val_str); i++)
+ if ( (':' == val_str[i]) ||
+ ('.' == val_str[i]) )
+ val_str[i] = '_';
+
+ GNUNET_snprintf (dir,
+ sizeof (dir),
+ "%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS DIR_SEPARATOR_STR "%s-%s",
+ exchange_directory,
+ val_str,
+ hash_str);
+ GNUNET_free (hash_str);
+ GNUNET_free (val_str);
+ return dir;
+}
+
+
+/**
+ * Obtain the name of the file we would use to store the key
+ * information for a coin of the given type @a p and validity
+ * start time @a start
+ *
+ * @param p parameters for the coin
+ * @param start when would the coin begin to be issued
+ * @return name of the file to use for this coin
+ * (valid until next call to this function)
+ */
+static const char *
+get_cointype_file (const struct CoinTypeParams *p,
+ struct GNUNET_TIME_Absolute start)
+{
+ static char filename[4096];
+ const char *dir;
+
+ dir = get_cointype_dir (p);
+ GNUNET_snprintf (filename,
+ sizeof (filename),
+ "%s" DIR_SEPARATOR_STR "%llu",
+ dir,
+ (unsigned long long) start.abs_value_us);
+ return filename;
+}
+
+
+/**
+ * Get the latest key file from a past run of the key generation
+ * tool. Used to calculate the starting time for the keys we
+ * generate during this invocation. This function is used to
+ * handle both signing keys and coin keys, as in both cases
+ * the filenames correspond to the timestamps we need.
+ *
+ * @param cls closure, a `struct GNUNET_TIME_Absolute *`, updated
+ * to contain the highest timestamp (below #now)
+ * that was found
+ * @param filename complete filename (absolute path)
+ * @return #GNUNET_OK (to continue to iterate)
+ */
+static int
+get_anchor_iter (void *cls,
+ const char *filename)
+{
+ struct GNUNET_TIME_Absolute *anchor = cls;
+ struct GNUNET_TIME_Absolute stamp;
+ const char *base;
+ char *end = NULL;
+
+ base = GNUNET_STRINGS_get_short_name (filename);
+ stamp.abs_value_us = strtol (base,
+ &end,
+ 10);
+ if ((NULL == end) || (0 != *end))
+ {
+ fprintf(stderr,
+ "Ignoring unexpected file `%s'.\n",
+ filename);
+ return GNUNET_OK;
+ }
+ *anchor = GNUNET_TIME_absolute_max (stamp,
+ *anchor);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Get the timestamp where the first new key should be generated.
+ * Relies on correctly named key files (as we do not parse them,
+ * but just look at the filenames to "guess" at their contents).
+ *
+ * @param dir directory that should contain the existing keys
+ * @param duration how long is one key valid (for signing)?
+ * @param overlap what's the overlap between the keys validity period?
+ * @param[out] anchor the timestamp where the first new key should be generated
+ */
+static void
+get_anchor (const char *dir,
+ struct GNUNET_TIME_Relative duration,
+ struct GNUNET_TIME_Relative overlap,
+ struct GNUNET_TIME_Absolute *anchor)
+{
+ GNUNET_assert (0 == duration.rel_value_us % 1000000);
+ GNUNET_assert (0 == overlap.rel_value_us % 1000000);
+ if (GNUNET_YES !=
+ GNUNET_DISK_directory_test (dir,
+ GNUNET_YES))
+ {
+ *anchor = now;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "No existing keys found, starting with fresh key set.\n");
+ return;
+ }
+ *anchor = GNUNET_TIME_UNIT_ZERO_ABS;
+ if (-1 ==
+ GNUNET_DISK_directory_scan (dir,
+ &get_anchor_iter,
+ anchor))
+ {
+ *anchor = now;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "No existing keys found, starting with fresh key set.\n");
+ return;
+ }
+
+ if ((GNUNET_TIME_absolute_add (*anchor,
+ duration)).abs_value_us < now.abs_value_us)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Existing keys are way too old, starting with fresh key set.\n");
+ *anchor = now;
+ }
+ else if (anchor->abs_value_us != now.abs_value_us)
+ {
+ /* Real starting time is the last start time + duration - overlap */
+ *anchor = GNUNET_TIME_absolute_add (*anchor,
+ duration);
+ *anchor = GNUNET_TIME_absolute_subtract (*anchor,
+ overlap);
+ }
+ /* anchor is now the stamp where we need to create a new key */
+}
+
+
+/**
+ * Create a exchange signing key (for signing exchange messages, not for coins)
+ * and assert its correctness by signing it with the master key.
+ *
+ * @param start start time of the validity period for the key
+ * @param duration how long should the key be valid
+ * @param end when do all signatures by this key expire
+ * @param[out] pi set to the signing key information
+ */
+static void
+create_signkey_issue_priv (struct GNUNET_TIME_Absolute start,
+ struct GNUNET_TIME_Relative duration,
+ struct GNUNET_TIME_Absolute end,
+ struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP *pi)
+{
+ struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
+ struct TALER_ExchangeSigningKeyValidityPS *issue = &pi->issue;
+
+ priv = GNUNET_CRYPTO_eddsa_key_create ();
+ pi->signkey_priv.eddsa_priv = *priv;
+ GNUNET_free (priv);
+ issue->master_public_key = master_public_key;
+ issue->start = GNUNET_TIME_absolute_hton (start);
+ issue->expire = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (start,
+ duration));
+ issue->end = GNUNET_TIME_absolute_hton (end);
+ GNUNET_CRYPTO_eddsa_key_get_public (&pi->signkey_priv.eddsa_priv,
+ &issue->signkey_pub.eddsa_pub);
+ issue->purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY);
+ issue->purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS) -
+ offsetof (struct TALER_ExchangeSigningKeyValidityPS,
+ purpose));
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (&master_priv.eddsa_priv,
+ &issue->purpose,
+ &issue->signature.eddsa_signature));
+}
+
+
+/**
+ * Generate signing keys starting from the last key found to
+ * the lookahead time.
+ *
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+exchange_keys_update_signkeys ()
+{
+ struct GNUNET_TIME_Relative signkey_duration;
+ struct GNUNET_TIME_Relative legal_duration;
+ struct GNUNET_TIME_Absolute anchor;
+ char *signkey_dir;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ "exchange_keys",
+ "signkey_duration",
+ &signkey_duration))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "exchange_keys",
+ "signkey_duration");
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ "exchange_keys",
+ "legal_duration",
+ &legal_duration))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "exchange_keys",
+ "legal_duration",
+ "fails to specify valid timeframe");
+ return GNUNET_SYSERR;
+ }
+ if (signkey_duration.rel_value_us > legal_duration.rel_value_us)
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "exchange_keys",
+ "legal_duration",
+ "must be longer than signkey_duration");
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&signkey_duration);
+ GNUNET_asprintf (&signkey_dir,
+ "%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS,
+ exchange_directory);
+ /* make sure the directory exists */
+ if (GNUNET_OK !=
+ GNUNET_DISK_directory_create (signkey_dir))
+ {
+ fprintf (stderr,
+ "Failed to create signing key directory\n");
+ return GNUNET_SYSERR;
+ }
+
+ get_anchor (signkey_dir,
+ signkey_duration,
+ GNUNET_TIME_UNIT_ZERO /* no overlap for signing keys */,
+ &anchor);
+
+ while (anchor.abs_value_us < lookahead_sign_stamp.abs_value_us)
+ {
+ const char *skf;
+ struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP signkey_issue;
+ ssize_t nwrite;
+ struct GNUNET_TIME_Absolute end;
+
+ skf = get_signkey_file (anchor);
+ end = GNUNET_TIME_absolute_add (anchor,
+ legal_duration);
+ GNUNET_break (GNUNET_YES !=
+ GNUNET_DISK_file_test (skf));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Generating signing key for %s.\n",
+ GNUNET_STRINGS_absolute_time_to_string (anchor));
+ create_signkey_issue_priv (anchor,
+ signkey_duration,
+ end,
+ &signkey_issue);
+ nwrite = GNUNET_DISK_fn_write (skf,
+ &signkey_issue,
+ sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP),
+ GNUNET_DISK_PERM_USER_WRITE | GNUNET_DISK_PERM_USER_READ);
+ if (sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP) != nwrite)
+ {
+ fprintf (stderr,
+ "Failed to write to file `%s': %s\n",
+ skf,
+ STRERROR (errno));
+ return GNUNET_SYSERR;
+ }
+ anchor = GNUNET_TIME_absolute_add (anchor,
+ signkey_duration);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Parse configuration for coin type parameters. Also determines
+ * our anchor by looking at the existing coins of the same type.
+ *
+ * @param ct section in the configuration file giving the coin type parameters
+ * @param[out] params set to the coin parameters from the configuration
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the configuration is invalid
+ */
+static int
+get_cointype_params (const char *ct,
+ struct CoinTypeParams *params)
+{
+ const char *dir;
+ unsigned long long rsa_keysize;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ ct,
+ "duration_withdraw",
+ &params->duration_withdraw))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "duration_withdraw");
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&params->duration_withdraw);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ ct,
+ "duration_spend",
+ &params->duration_spend))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "duration_spend");
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&params->duration_spend);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ ct,
+ "duration_legal",
+ &params->duration_legal))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "duration_legal");
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&params->duration_legal);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ ct,
+ "duration_overlap",
+ &params->duration_overlap))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "exchange_denom_duration_overlap");
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&params->duration_overlap);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (kcfg,
+ ct,
+ "rsa_keysize",
+ &rsa_keysize))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "rsa_keysize");
+ return GNUNET_SYSERR;
+ }
+ if ( (rsa_keysize > 4 * 2048) ||
+ (rsa_keysize < 1024) )
+ {
+ fprintf (stderr,
+ "Given RSA keysize %llu outside of permitted range\n",
+ rsa_keysize);
+ return GNUNET_SYSERR;
+ }
+ params->rsa_keysize = (unsigned int) rsa_keysize;
+ if (GNUNET_OK !=
+ TALER_config_get_denom (kcfg,
+ ct,
+ "value",
+ &params->value))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "value");
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ TALER_config_get_denom (kcfg,
+ ct,
+ "fee_withdraw",
+ &params->fee_withdraw))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "fee_withdraw");
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ TALER_config_get_denom (kcfg,
+ ct,
+ "fee_deposit",
+ &params->fee_deposit))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "fee_deposit");
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ TALER_config_get_denom (kcfg,
+ ct,
+ "fee_refresh",
+ &params->fee_refresh))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ ct,
+ "fee_refresh");
+ return GNUNET_SYSERR;
+ }
+
+ dir = get_cointype_dir (params);
+ get_anchor (dir,
+ params->duration_withdraw,
+ params->duration_overlap,
+ &params->anchor);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Initialize the private and public key information structure for
+ * signing coins into existence. Generates the private signing key
+ * and signes it together with the coin's meta data using the master
+ * signing key.
+ *
+ * @param params parameters used to initialize the @a dki
+ * @param[out] dki initialized according to @a params
+ */
+static void
+create_denomkey_issue (const struct CoinTypeParams *params,
+ struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
+{
+ dki->denom_priv.rsa_private_key
+ = GNUNET_CRYPTO_rsa_private_key_create (params->rsa_keysize);
+ GNUNET_assert (NULL != dki->denom_priv.rsa_private_key);
+ dki->denom_pub.rsa_public_key
+ = GNUNET_CRYPTO_rsa_private_key_get_public (dki->denom_priv.rsa_private_key);
+ GNUNET_CRYPTO_rsa_public_key_hash (dki->denom_pub.rsa_public_key,
+ &dki->issue.properties.denom_hash);
+ dki->issue.properties.master = master_public_key;
+ dki->issue.properties.start = GNUNET_TIME_absolute_hton (params->anchor);
+ dki->issue.properties.expire_withdraw =
+ GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (params->anchor,
+ params->duration_withdraw));
+ dki->issue.properties.expire_spend =
+ GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (params->anchor,
+ params->duration_spend));
+ dki->issue.properties.expire_legal =
+ GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (params->anchor,
+ params->duration_legal));
+ TALER_amount_hton (&dki->issue.properties.value,
+ &params->value);
+ TALER_amount_hton (&dki->issue.properties.fee_withdraw,
+ &params->fee_withdraw);
+ TALER_amount_hton (&dki->issue.properties.fee_deposit,
+ &params->fee_deposit);
+ TALER_amount_hton (&dki->issue.properties.fee_refresh,
+ &params->fee_refresh);
+ dki->issue.properties.purpose.purpose
+ = htonl (TALER_SIGNATURE_MASTER_DENOMINATION_KEY_VALIDITY);
+ dki->issue.properties.purpose.size
+ = htonl (sizeof (struct TALER_DenominationKeyValidityPS));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (&master_priv.eddsa_priv,
+ &dki->issue.properties.purpose,
+ &dki->issue.signature.eddsa_signature));
+}
+
+
+/**
+ * Generate new coin signing keys for the coin type of the given @a
+ * coin_alias.
+ *
+ * @param cls a `int *`, to be set to #GNUNET_SYSERR on failure
+ * @param coin_alias name of the coin's section in the configuration
+ */
+static void
+exchange_keys_update_cointype (void *cls,
+ const char *coin_alias)
+{
+ int *ret = cls;
+ struct CoinTypeParams p;
+ const char *dkf;
+ struct TALER_EXCHANGEDB_DenominationKeyIssueInformation denomkey_issue;
+
+ if (0 != strncasecmp (coin_alias,
+ "coin_",
+ strlen ("coin_")))
+ return; /* not a coin definition */
+ if (GNUNET_OK !=
+ get_cointype_params (coin_alias,
+ &p))
+ {
+ *ret = GNUNET_SYSERR;
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_DISK_directory_create (get_cointype_dir (&p)))
+ {
+ *ret = GNUNET_SYSERR;
+ return;
+ }
+
+ while (p.anchor.abs_value_us < lookahead_sign_stamp.abs_value_us)
+ {
+ dkf = get_cointype_file (&p,
+ p.anchor);
+ GNUNET_break (GNUNET_YES != GNUNET_DISK_file_test (dkf));
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Generating denomination key for type `%s', start %s at %s\n",
+ coin_alias,
+ GNUNET_STRINGS_absolute_time_to_string (p.anchor),
+ dkf);
+ create_denomkey_issue (&p,
+ &denomkey_issue);
+ if (GNUNET_OK !=
+ TALER_EXCHANGEDB_denomination_key_write (dkf,
+ &denomkey_issue))
+ {
+ fprintf (stderr,
+ "Failed to write denomination key information to file `%s'.\n",
+ dkf);
+ *ret = GNUNET_SYSERR;
+ GNUNET_CRYPTO_rsa_private_key_free (denomkey_issue.denom_priv.rsa_private_key);
+ return;
+ }
+ if ( (NULL != auditor_output_file) &&
+ (sizeof (denomkey_issue.issue.properties) !=
+ fwrite (&denomkey_issue.issue.properties,
+ sizeof (struct TALER_DenominationKeyValidityPS),
+ 1,
+ auditor_output_file)) )
+ {
+ fprintf (stderr,
+ "Failed to write denomination key information to %s: %s\n",
+ auditorrequestfile,
+ STRERROR (errno));
+ *ret = GNUNET_SYSERR;
+ return;
+ }
+ GNUNET_CRYPTO_rsa_private_key_free (denomkey_issue.denom_priv.rsa_private_key);
+ p.anchor = GNUNET_TIME_absolute_add (p.anchor,
+ p.duration_spend);
+ p.anchor = GNUNET_TIME_absolute_subtract (p.anchor,
+ p.duration_overlap);
+ }
+}
+
+
+/**
+ * Update all of the denomination keys of the exchange.
+ *
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static int
+exchange_keys_update_denomkeys ()
+{
+ int ok;
+
+ ok = GNUNET_OK;
+ GNUNET_CONFIGURATION_iterate_sections (kcfg,
+ &exchange_keys_update_cointype,
+ &ok);
+ return ok;
+}
+
+
+/**
+ * The main function of the taler-exchange-keyup tool. This tool is used
+ * to create the signing and denomination keys for the exchange. It uses
+ * the long-term offline private key and writes the (additional) key
+ * files to the respective exchange directory (from where they can then be
+ * copied to the online server). Note that we need (at least) the
+ * most recent generated previous keys so as to align the validity
+ * periods.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc,
+ char *const *argv)
+{
+ static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+ {'d', "exchange-dir", "DIR",
+ "exchange directory with keys to update", 1,
+ &GNUNET_GETOPT_set_filename, &exchange_directory},
+ TALER_GETOPT_OPTION_HELP ("Setup signing and denomination keys for a Taler exchange"),
+ {'m', "master-key", "FILE",
+ "master key file (private key)", 1,
+ &GNUNET_GETOPT_set_filename, &masterkeyfile},
+ {'o', "output", "FILE",
+ "auditor denomination key signing request file to create", 1,
+ &GNUNET_GETOPT_set_filename, &auditorrequestfile},
+ {'t', "time", "TIMESTAMP",
+ "pretend it is a different time for the update", 0,
+ &GNUNET_GETOPT_set_string, &pretend_time_str},
+ GNUNET_GETOPT_OPTION_VERSION (VERSION "-" VCS_VERSION),
+ GNUNET_GETOPT_OPTION_END
+ };
+ struct GNUNET_TIME_Relative lookahead_sign;
+ struct GNUNET_CRYPTO_EddsaPrivateKey *eddsa_priv;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_log_setup ("taler-exchange-keyup",
+ "WARNING",
+ NULL));
+
+ if (GNUNET_GETOPT_run ("taler-exchange-keyup",
+ options,
+ argc, argv) < 0)
+ return 1;
+ if (NULL == exchange_directory)
+ {
+ fprintf (stderr,
+ "Exchange directory not given\n");
+ return 1;
+ }
+ if (NULL != pretend_time_str)
+ {
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_fancy_time_to_absolute (pretend_time_str,
+ &now))
+ {
+ fprintf (stderr,
+ "timestamp `%s' invalid\n",
+ pretend_time_str);
+ return 1;
+ }
+ }
+ else
+ {
+ now = GNUNET_TIME_absolute_get ();
+ }
+ TALER_round_abs_time (&now);
+
+ kcfg = TALER_config_load (exchange_directory);
+ if (NULL == kcfg)
+ {
+ fprintf (stderr,
+ "Failed to load exchange configuration\n");
+ return 1;
+ }
+ if (NULL == masterkeyfile)
+ {
+ fprintf (stderr,
+ "Master key file not given\n");
+ return 1;
+ }
+ eddsa_priv = GNUNET_CRYPTO_eddsa_key_create_from_file (masterkeyfile);
+ if (NULL == eddsa_priv)
+ {
+ fprintf (stderr,
+ "Failed to initialize master key from file `%s'\n",
+ masterkeyfile);
+ return 1;
+ }
+ master_priv.eddsa_priv = *eddsa_priv;
+ GNUNET_free (eddsa_priv);
+ GNUNET_CRYPTO_eddsa_key_get_public (&master_priv.eddsa_priv,
+ &master_public_key.eddsa_pub);
+
+ if (NULL != auditorrequestfile)
+ {
+ auditor_output_file = FOPEN (auditorrequestfile,
+ "w");
+ if (NULL == auditor_output_file)
+ {
+ fprintf (stderr,
+ "Failed to open `%s' for writing: %s\n",
+ auditorrequestfile,
+ STRERROR (errno));
+ return 1;
+ }
+ }
+
+ /* check if key from file matches the one from the configuration */
+ {
+ struct GNUNET_CRYPTO_EddsaPublicKey master_public_key_from_cfg;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_data (kcfg,
+ "exchange",
+ "master_public_key",
+ &master_public_key_from_cfg,
+ sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "exchange",
+ "master_public_key");
+ return 1;
+ }
+ if (0 !=
+ memcmp (&master_public_key,
+ &master_public_key_from_cfg,
+ sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "exchange",
+ "master_public_key",
+ _("does not match with private key"));
+ return 1;
+ }
+ }
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (kcfg,
+ "exchange_keys",
+ "lookahead_sign",
+ &lookahead_sign))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "exchange_keys",
+ "lookahead_sign");
+ return GNUNET_SYSERR;
+ }
+ if (0 == lookahead_sign.rel_value_us)
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "exchange_keys",
+ "lookahead_sign",
+ _("must not be zero"));
+ return GNUNET_SYSERR;
+ }
+ TALER_round_rel_time (&lookahead_sign);
+ lookahead_sign_stamp = GNUNET_TIME_absolute_add (now,
+ lookahead_sign);
+
+
+ /* finally, do actual work */
+ if (GNUNET_OK != exchange_keys_update_signkeys ())
+ return 1;
+
+ if (GNUNET_OK != exchange_keys_update_denomkeys ())
+ return 1;
+ if (NULL != auditor_output_file)
+ {
+ FCLOSE (auditor_output_file);
+ auditor_output_file = NULL;
+ }
+ return 0;
+}
+
+/* end of taler-exchange-keyup.c */