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authorChristian Grothoff <christian@grothoff.org>2017-03-18 16:56:31 +0100
committerChristian Grothoff <christian@grothoff.org>2017-03-18 16:56:31 +0100
commit9a5cef0eb1d415eb2fce18a5d1b615b2f025ddd5 (patch)
treed02ad9fb438494c5b719c707d2759bdf91fa4924 /src/auditor/taler-auditor.c
parent6a98b07ff2e75a429982eaf6b00ce54c95a28e8e (diff)
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complete skeleton of wire-out audit logic
Diffstat (limited to 'src/auditor/taler-auditor.c')
-rw-r--r--src/auditor/taler-auditor.c617
1 files changed, 468 insertions, 149 deletions
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",