diff options
Diffstat (limited to 'src/auditor')
| -rw-r--r-- | src/auditor/Makefile.am | 1 | ||||
| -rw-r--r-- | src/auditor/taler-auditor.c | 617 |
2 files changed, 469 insertions, 149 deletions
diff --git a/src/auditor/Makefile.am b/src/auditor/Makefile.am index 04e7dcb8f..c2e77f117 100644 --- a/src/auditor/Makefile.am +++ b/src/auditor/Makefile.am @@ -24,6 +24,7 @@ taler_auditor_LDADD = \ $(top_builddir)/src/wire/libtalerwire.la \ $(top_builddir)/src/exchangedb/libtalerexchangedb.la \ $(top_builddir)/src/auditordb/libtalerauditordb.la \ + -ljansson \ -lgnunetutil taler_auditor_sign_SOURCES = \ diff --git a/src/auditor/taler-auditor.c b/src/auditor/taler-auditor.c index cf7e332b4..c57adb5a3 100644 --- a/src/auditor/taler-auditor.c +++ b/src/auditor/taler-auditor.c @@ -22,13 +22,13 @@ * - This auditor does not verify that 'reserves_in' actually matches * the wire transfers from the bank. This needs to be checked separately! * - Similarly, we do not check that the outgoing wire transfers match those - * given in the 'wire_out' (TBD!) table. This needs to be checked separately! + * given in the 'wire_out' table. This needs to be checked separately! * * TODO: - * - implement merchant deposit audit - * => we need a 'wire_out' table here (amount, h-wire, date, wtid) - * - modify auditordb to allow multiple last serial IDs per table in progress tracking - * - modify auditordb to track risk with balances and fees + * - implement merchant deposit audit starting with 'wire_out' + * - modify auditordb to allow multiple last serial IDs per table in progress tracking (needed?) + * - modify auditordb to track risk with balances and fees (and rename callback + * to clarify what it is) * - modify auditordb to return DK when we inquire about deposit/refresh/refund, * so we can avoid the costly #get_coin_summary with the transaction history building * (at least during #analyze_coins); the logic may be partially useful in @@ -42,6 +42,7 @@ #include "taler_auditordb_plugin.h" #include "taler_exchangedb_plugin.h" #include "taler_json_lib.h" +#include "taler_wire_lib.h" #include "taler_signatures.h" @@ -71,6 +72,11 @@ static struct TALER_EXCHANGEDB_Plugin *edb; static char *currency; /** + * Our configuration. + */ +static const struct GNUNET_CONFIGURATION_Handle *cfg; + +/** * Our session with the #edb. */ static struct TALER_EXCHANGEDB_Session *esession; @@ -1231,115 +1237,6 @@ free_coin (void *cls, /** - * Check coin's transaction history for plausibility. Does NOT check - * the signatures (those are checked independently), but does check - * that the amounts add up to a plausible overall picture. - * - * FIXME: is it wise to do this here? Maybe better to do this during - * processing of payments to the merchants... - * - * @param coin_pub public key of the coin (for reporting) - * @param dki denomination information about the coin - * @param tl_head head of transaction history to verify - */ -static void -check_transaction_history (const struct TALER_CoinSpendPublicKeyP *coin_pub, - const struct TALER_EXCHANGEDB_DenominationKeyInformationP *dki, - const struct TALER_EXCHANGEDB_TransactionList *tl_head) -{ - struct TALER_Amount expenditures; - struct TALER_Amount refunds; - struct TALER_Amount fees; - struct TALER_Amount final_expenditures; - - GNUNET_assert (NULL != tl_head); - TALER_amount_get_zero (currency, - &expenditures); - TALER_amount_get_zero (currency, - &refunds); - TALER_amount_get_zero (currency, - &fees); - for (const struct TALER_EXCHANGEDB_TransactionList *tl = tl_head;NULL != tl;tl = tl->next) - { - const struct TALER_Amount *amount_with_fee; - const struct TALER_Amount *fee; - const struct TALER_AmountNBO *fee_dki; - struct TALER_Amount *add_to; - struct TALER_Amount tmp; - - add_to = NULL; - switch (tl->type) { - case TALER_EXCHANGEDB_TT_DEPOSIT: - amount_with_fee = &tl->details.deposit->amount_with_fee; - fee = &tl->details.deposit->deposit_fee; - fee_dki = &dki->properties.fee_deposit; - add_to = &expenditures; - break; - case TALER_EXCHANGEDB_TT_REFRESH_MELT: - amount_with_fee = &tl->details.melt->amount_with_fee; - fee = &tl->details.melt->melt_fee; - fee_dki = &dki->properties.fee_refresh; - add_to = &expenditures; - break; - case TALER_EXCHANGEDB_TT_REFUND: - amount_with_fee = &tl->details.refund->refund_amount; - fee = &tl->details.refund->refund_fee; - fee_dki = &dki->properties.fee_refund; - add_to = &refunds; - // FIXME: where do we check that the refund(s) - // of the coin match the deposit(s) of the coin (by merchant, timestamp, etc.)? - break; - } - GNUNET_assert (NULL != add_to); /* check switch was exhaustive */ - if (GNUNET_OK != - TALER_amount_add (add_to, - add_to, - amount_with_fee)) - { - /* overflow in history already!? inconceivable! Bad DB! */ - GNUNET_break (0); - // FIXME: report! - return; - } - TALER_amount_ntoh (&tmp, - fee_dki); - if (0 != - TALER_amount_cmp (&tmp, - fee)) - { - /* Disagreement in fee structure within DB! */ - GNUNET_break (0); - // FIXME: report! - return; - } - if (GNUNET_OK != - TALER_amount_add (&fees, - &fees, - fee)) - { - /* overflow in fee total? inconceivable! Bad DB! */ - GNUNET_break (0); - // FIXME: report! - return; - } - } /* for 'tl' */ - - /* Finally, calculate total balance change, i.e. expenditures minus refunds */ - if (GNUNET_OK != - TALER_amount_subtract (&final_expenditures, - &expenditures, - &refunds)) - { - /* refunds above expenditures? inconceivable! Bad DB! */ - GNUNET_break (0); - // FIXME: report! - return; - } - -} - - -/** * Obtain information about the coin from the cache or the database. * * If we obtain this information for the first time, also check that @@ -1349,10 +1246,8 @@ check_transaction_history (const struct TALER_CoinSpendPublicKeyP *coin_pub, * @param coin_pub public key of the coin to get information about * @return NULL on error */ -// FIXME: move this to _outgoing_ transaction checking, -// replace HERE by something that just gets the denomination hash! -// (avoids confusion on checking coin's transaction history AND -// makes this part WAY more efficient!) +// FIXME: replace by something that just gets the denomination hash! +// (makes this part WAY more efficient!) static struct CoinSummary * get_coin_summary (struct CoinContext *cc, const struct TALER_CoinSpendPublicKeyP *coin_pub) @@ -1408,11 +1303,6 @@ get_coin_summary (struct CoinContext *cc, return NULL; } - /* verify that the transaction history we are given is reasonable */ - check_transaction_history (coin_pub, - dki, - tl); - /* allocate coin slot in ring buffer */ if (MAX_COIN_SUMMARIES >= cc->summaries_off) cc->summaries_off = 0; @@ -1824,6 +1714,10 @@ deposit_cb (void *cls, } } + /* TODO: *if* past pay_deadline, check that + aggregation record exists for the deposit; + if NOT, check that full _refund_ exists. */ + return GNUNET_OK; } @@ -2108,55 +2002,461 @@ analyze_coins (void *cls) /** - * Summary data we keep per merchant. + * Information we keep per loaded wire plugin. */ -struct MerchantSummary +struct WirePlugin { /** - * Which account were we supposed to pay? + * Kept in a DLL. */ - struct GNUNET_HashCode h_wire; + struct WirePlugin *next; + + /** + * Kept in a DLL. + */ + struct WirePlugin *prev; /** - * Total due to be paid to @e h_wire. + * Name of the wire method. */ - struct TALER_Amount total_due; + char *type; /** - * Total paid to @e h_wire. + * Handle to the wire plugin. */ - struct TALER_Amount total_paid; + struct TALER_WIRE_Plugin *plugin; + +}; + + +/** + * Closure for callbacks during #analyze_merchants(). + */ +struct MerchantContext +{ /** - * Total wire fees charged. + * DLL of wire plugins encountered. */ - struct TALER_Amount total_fees; + struct WirePlugin *wire_head; /** - * Last (expired) refund deadline of all the transactions totaled - * up in @e due. + * DLL of wire plugins encountered. */ - struct GNUNET_TIME_Absolute last_refund_deadline; + struct WirePlugin *wire_tail; }; /** - * Closure for callbacks during #analyze_merchants(). + * Find the relevant wire plugin. + * + * @param mc context to search + * @param type type of the wire plugin to load + * @return NULL on error */ -struct MerchantContext +static struct TALER_WIRE_Plugin * +get_wire_plugin (struct MerchantContext *mc, + const char *type) +{ + struct WirePlugin *wp; + struct TALER_WIRE_Plugin *plugin; + + for (wp = mc->wire_head; NULL != wp; wp = wp->next) + if (0 == strcmp (type, + wp->type)) + return wp->plugin; + plugin = TALER_WIRE_plugin_load (cfg, + type); + if (NULL == plugin) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Failed to locate wire plugin for `%s'\n", + type); + return NULL; + } + wp = GNUNET_new (struct WirePlugin); + wp->type = GNUNET_strdup (type); + wp->plugin = plugin; + GNUNET_CONTAINER_DLL_insert (mc->wire_head, + mc->wire_tail, + wp); + return plugin; +} + + +/** + * Closure for #wire_transfer_information_cb. + */ +struct WireCheckContext { /** - * Map for tracking information about merchants. + * Corresponding merchant context. */ - struct GNUNET_CONTAINER_MultiHashMap *merchants; + struct MerchantContext *mc; + + /** + * Total deposits claimed by all transactions that were aggregated + * under the given @e wtid. + */ + struct TALER_Amount total_deposits; + + /** + * Hash of the wire transfer details of the receiver. + */ + struct GNUNET_HashCode h_wire; + + /** + * Execution time of the wire transfer. + */ + struct GNUNET_TIME_Absolute date; + + /** + * Set to error message of @e ok is #GNUNET_SYSERR. + */ + const char *emsg; + + /** + * Wire method used for the transfer. + */ + const char *method; + + /** + * Set to #GNUNET_SYSERR if there are inconsistencies. + */ + int ok; }; /** + * Check coin's transaction history for plausibility. Does NOT check + * the signatures (those are checked independently), but does check + * that the amounts add up to the picture claimed by the aggregation table. + * + * @param coin_pub public key of the coin (for reporting) + * @param h_proposal_data hash of the proposal for which we calculate the amount + * @param merchant_pub public key of the merchant (who is allowed to issue refunds) + * @param dki denomination information about the coin + * @param tl_head head of transaction history to verify + * @param[out] final amount the coin contributes to the transaction + * @param[out] final fees the exchange charged for the transaction + * @return #GNUNET_OK on success, #GNUNET_SYSERR on error + */ +static int +check_transaction_history (const struct TALER_CoinSpendPublicKeyP *coin_pub, + const struct GNUNET_HashCode *h_proposal_data, + const struct TALER_MerchantPublicKeyP *merchant_pub, + const struct TALER_EXCHANGEDB_DenominationKeyInformationP *dki, + const struct TALER_EXCHANGEDB_TransactionList *tl_head, + struct TALER_Amount *final_expenditures, + struct TALER_Amount *final_fees) +{ + struct TALER_Amount expenditures; + struct TALER_Amount refunds; + struct TALER_Amount fees; + + GNUNET_assert (NULL != tl_head); + TALER_amount_get_zero (currency, + &expenditures); + TALER_amount_get_zero (currency, + &refunds); + TALER_amount_get_zero (currency, + &fees); + for (const struct TALER_EXCHANGEDB_TransactionList *tl = tl_head;NULL != tl;tl = tl->next) + { + const struct TALER_Amount *amount_with_fee; + const struct TALER_Amount *fee; + const struct TALER_AmountNBO *fee_dki; + struct TALER_Amount *add_to; + struct TALER_Amount tmp; + + add_to = NULL; + // FIXME: + // - for refunds/deposits that apply to this merchant and this contract + // we need to update the total expenditures/refunds/fees + // - for all other operations, we need to update the per-coin totals + // and at the end check that they do not exceed the value of the coin! + switch (tl->type) { + case TALER_EXCHANGEDB_TT_DEPOSIT: + amount_with_fee = &tl->details.deposit->amount_with_fee; + fee = &tl->details.deposit->deposit_fee; + fee_dki = &dki->properties.fee_deposit; + add_to = &expenditures; + break; + case TALER_EXCHANGEDB_TT_REFRESH_MELT: + amount_with_fee = &tl->details.melt->amount_with_fee; + fee = &tl->details.melt->melt_fee; + fee_dki = &dki->properties.fee_refresh; + add_to = &expenditures; + break; + case TALER_EXCHANGEDB_TT_REFUND: + amount_with_fee = &tl->details.refund->refund_amount; + fee = &tl->details.refund->refund_fee; + fee_dki = &dki->properties.fee_refund; + add_to = &refunds; + // FIXME: where do we check that the refund(s) + // of the coin match the deposit(s) of the coin (by merchant, timestamp, etc.)? + break; + } + GNUNET_assert (NULL != add_to); /* check switch was exhaustive */ + if (GNUNET_OK != + TALER_amount_add (add_to, + add_to, + amount_with_fee)) + { + /* overflow in history already!? inconceivable! Bad DB! */ + GNUNET_break (0); + // FIXME: report! + return GNUNET_SYSERR; + } + TALER_amount_ntoh (&tmp, + fee_dki); + if (0 != + TALER_amount_cmp (&tmp, + fee)) + { + /* Disagreement in fee structure within DB! */ + GNUNET_break (0); + // FIXME: report! + return GNUNET_SYSERR; + } + if (GNUNET_OK != + TALER_amount_add (&fees, + &fees, + fee)) + { + /* overflow in fee total? inconceivable! Bad DB! */ + GNUNET_break (0); + // FIXME: report! + return GNUNET_SYSERR; + } + } /* for 'tl' */ + + /* Finally, calculate total balance change, i.e. expenditures minus refunds */ + if (GNUNET_OK != + TALER_amount_subtract (final_expenditures, + &expenditures, + &refunds)) + { + /* refunds above expenditures? inconceivable! Bad DB! */ + GNUNET_break (0); + // FIXME: report! + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * Function called with the results of the lookup of the + * transaction data associated with a wire transfer identifier. + * + * @param cls a `struct WireCheckContext` + * @param merchant_pub public key of the merchant (should be same for all callbacks with the same @e cls) + * @param wire_method which wire plugin was used for the transfer? + * @param h_wire hash of wire transfer details of the merchant (should be same for all callbacks with the same @e cls) + * @param exec_time execution time of the wire transfer (should be same for all callbacks with the same @e cls) + * @param h_proposal_data which proposal was this payment about + * @param coin_pub which public key was this payment about + * @param coin_value amount contributed by this coin in total (with fee) + * @param coin_fee applicable fee for this coin + */ +// TODO: modify to have rowid to log errors in a more fine-grained way? +static void +wire_transfer_information_cb (void *cls, + const struct TALER_MerchantPublicKeyP *merchant_pub, + const char *wire_method, + const struct GNUNET_HashCode *h_wire, + struct GNUNET_TIME_Absolute exec_time, + const struct GNUNET_HashCode *h_proposal_data, + const struct TALER_CoinSpendPublicKeyP *coin_pub, + const struct TALER_Amount *coin_value, + const struct TALER_Amount *coin_fee) +{ + struct WireCheckContext *wcc = cls; + const struct TALER_EXCHANGEDB_DenominationKeyInformationP *dki; + struct TALER_Amount contribution; + struct TALER_Amount computed_value; + struct TALER_Amount computed_fees; + struct TALER_EXCHANGEDB_TransactionList *tl; + const struct TALER_CoinPublicInfo *coin; + + /* Obtain coin's transaction history */ + tl = edb->get_coin_transactions (edb->cls, + esession, + coin_pub); + if (NULL == tl) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "no transaction history for coin claimed in aggregation"; + return; + } + + /* Obtain general denomination information about the coin */ + coin = NULL; + switch (tl->type) + { + case TALER_EXCHANGEDB_TT_DEPOSIT: + coin = &tl->details.deposit->coin; + break; + case TALER_EXCHANGEDB_TT_REFRESH_MELT: + coin = &tl->details.melt->coin; + break; + case TALER_EXCHANGEDB_TT_REFUND: + coin = &tl->details.refund->coin; + break; + } + GNUNET_assert (NULL != coin); /* hard check that switch worked */ + if (GNUNET_OK != + get_denomination_info (&coin->denom_pub, + &dki, + NULL)) + { + GNUNET_break (0); + edb->free_coin_transaction_list (edb->cls, + tl); + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "could not find denomination key for coin claimed in aggregation"; + return; + } + + /* Check transaction history to see if it supports aggregate valuation */ + check_transaction_history (coin_pub, + h_proposal_data, + merchant_pub, + dki, + tl, + &computed_value, + &computed_fees); + if (0 != + TALER_amount_cmp (&computed_value, + coin_value)) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "coin transaction history and aggregation disagree about coin's contribution"; + } + if (0 != + TALER_amount_cmp (&computed_fees, + coin_fee)) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "coin transaction history and aggregation disagree about applicable fees"; + } + edb->free_coin_transaction_list (edb->cls, + tl); + + /* Check other details of wire transfer match */ + if (0 != strcmp (wire_method, + wcc->method)) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "wire method of aggregate do not match wire transfer"; + return; + } + if (0 != memcmp (h_wire, + &wcc->h_wire, + sizeof (struct GNUNET_HashCode))) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "account details of aggregate do not match account details of wire transfer"; + return; + } + if (exec_time.abs_value_us != wcc->date.abs_value_us) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "date given in aggregate does not match wire transfer date"; + return; + } + if (GNUNET_SYSERR == + TALER_amount_subtract (&contribution, + coin_value, + coin_fee)) + { + wcc->ok = GNUNET_SYSERR; + wcc->emsg = "could not calculate contribution of coin"; + return; + } + + /* Add coin's contribution to total aggregate value */ + GNUNET_assert (GNUNET_OK == + TALER_amount_add (&wcc->total_deposits, + &wcc->total_deposits, + &contribution)); +} + + +/** + * Check that a wire transfer made by the exchange is valid + * (has matching deposits). + * + * @param cls a `struct MerchantContext` + * @param rowid identifier of the respective row in the database + * @param date timestamp of the wire transfer (roughly) + * @param wtid wire transfer subject + * @param wire wire transfer details of the receiver + * @param amount amount that was wired + */ +static void +check_wire_out_cb (void *cls, + uint64_t rowid, + struct GNUNET_TIME_Absolute date, + const struct TALER_WireTransferIdentifierRawP *wtid, + const json_t *wire, + const struct TALER_Amount *amount) +{ + struct MerchantContext *mc = cls; + struct WireCheckContext wcc; + json_t *method; + struct TALER_WIRE_Plugin *plugin; + + wcc.mc = mc; + method = json_object_get (wire, + "type"); + if ( (NULL == method) || + (! json_is_string (method)) ) + { + // TODO: bitch + } + wcc.method = json_string_value (method); + wcc.ok = GNUNET_OK; + wcc.date = date; + TALER_amount_get_zero (amount->currency, + &wcc.total_deposits); + TALER_JSON_hash (wire, + &wcc.h_wire); + edb->lookup_wire_transfer (edb->cls, + esession, + wtid, + &wire_transfer_information_cb, + &wcc); + if (GNUNET_OK != wcc.ok) + { + // TODO: bitch + } + plugin = get_wire_plugin (mc, + wcc.method); + if (NULL == plugin) + { + // TODO: bitch + } + if (GNUNET_OK != + plugin->amount_round (plugin->cls, + &wcc.total_deposits)) + { + // TODO: bitch + } + if (0 != TALER_amount_cmp (amount, + &wcc.total_deposits)) + { + // TODO: bitch! + } +} + + +/** * Analyze the exchange aggregator's payment processing. * * @param cls closure @@ -2166,14 +2466,32 @@ static int analyze_merchants (void *cls) { struct MerchantContext mc; + struct WirePlugin *wc; + int ret; - mc.merchants = GNUNET_CONTAINER_multihashmap_create (1024, - GNUNET_YES); - - // TODO - - GNUNET_CONTAINER_multihashmap_destroy (mc.merchants); - return GNUNET_OK; + ret = GNUNET_OK; + mc.wire_head = NULL; + mc.wire_tail = NULL; + if (GNUNET_SYSERR == + edb->select_wire_out_above_serial_id (edb->cls, + esession, + 42 /* FIXME */, + &check_wire_out_cb, + &mc)) + { + GNUNET_break (0); + ret = GNUNET_SYSERR; + } + while (NULL != (wc = mc.wire_head)) + { + GNUNET_CONTAINER_DLL_remove (mc.wire_head, + mc.wire_tail, + wc); + TALER_WIRE_plugin_unload (wc->plugin); + GNUNET_free (wc->type); + GNUNET_free (wc); + } + return ret; } @@ -2364,14 +2682,15 @@ setup_sessions_and_run () * @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 + * @param c configuration */ static void run (void *cls, char *const *args, const char *cfgfile, - const struct GNUNET_CONFIGURATION_Handle *cfg) + const struct GNUNET_CONFIGURATION_Handle *c) { + cfg = c; if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "taler", |