aboutsummaryrefslogtreecommitdiff
path: root/src/auditor/taler-helper-auditor-deposits.c
blob: 3dbce0183e1e3fdf07393d14301b17fb6c145759 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
/*
  This file is part of TALER
  Copyright (C) 2016-2023 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero 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 Affero Public License for more details.

  You should have received a copy of the GNU Affero Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file auditor/taler-helper-auditor-deposits.c
 * @brief audits an exchange database for deposit confirmation consistency
 * @author Christian Grothoff
 * @author Nic Eigel
 *
 * We simply check that all of the deposit confirmations reported to us
 * by merchants were also reported to us by the exchange.
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_auditordb_plugin.h"
#include "taler_exchangedb_lib.h"
#include "taler_json_lib.h"
#include "taler_bank_service.h"
#include "taler_signatures.h"
#include "report-lib.h"
#include "taler_dbevents.h"
#include <jansson.h>

/*
--
-- SELECT serial_id,h_contract_terms,h_wire,merchant_pub ...
--   FROM auditor.auditor_deposit_confirmations
--   WHERE NOT ancient
--    ORDER BY exchange_timestamp ASC;
--  SELECT 1
-      FROM exchange.deposits dep
       WHERE ($RESULT.contract_terms = dep.h_contract_terms) AND ($RESULT.h_wire = dep.h_wire) AND ...);
-- IF FOUND
-- DELETE FROM auditor.auditor_deposit_confirmations
--   WHERE serial_id = $RESULT.serial_id;
-- SELECT exchange_timestamp AS latest
--   FROM exchange.deposits ORDER BY exchange_timestamp DESC;
-- latest -= 1 hour; // time is not exactly monotonic...
-- UPDATE auditor.deposit_confirmations
--   SET ancient=TRUE
--  WHERE exchange_timestamp < latest
--    AND NOT ancient;
*/

/**
 * Return value from main().
 */
static int global_ret;

/**
 * Run in test mode. Exit when idle instead of
 * going to sleep and waiting for more work.
 *
 * FIXME: not yet implemented!
 */
static int test_mode;

/**
 * Array of reports about missing deposit confirmations.
 */
static json_t *report_deposit_confirmation_inconsistencies;

/**
 * Total number of deposit confirmations that we did not get.
 */
static json_int_t number_missed_deposit_confirmations;

/**
 * Total amount involved in deposit confirmations that we did not get.
 */
static struct TALER_Amount total_missed_deposit_confirmations;

/**
 * Should we run checks that only work for exchange-internal audits?
 */
static int internal_checks;

static struct GNUNET_DB_EventHandler *eh;

/**
 * Our database plugin.
 */
static struct TALER_AUDITORDB_Plugin *db_plugin;

/**
 * The auditors's configuration.
 */
static const struct GNUNET_CONFIGURATION_Handle *cfg;

/**
 * Closure for #test_dc.
 */
struct DepositConfirmationContext
{

  /**
   * How many deposit confirmations did we NOT find in the #TALER_ARL_edb?
   */
  unsigned long long missed_count;

  /**
   * What is the total amount missing?
   */
  struct TALER_Amount missed_amount;

  /**
   * Lowest SerialID of the first coin we missed? (This is where we
   * should resume next time).
   */
  uint64_t first_missed_coin_serial;

  /**
   * Lowest SerialID of the first coin we missed? (This is where we
   * should resume next time).
   */
  uint64_t last_seen_coin_serial;

  /**
   * Success or failure of (exchange) database operations within
   * #test_dc.
   */
  enum GNUNET_DB_QueryStatus qs;

};

/**
 * Given a deposit confirmation from #TALER_ARL_adb, check that it is also
 * in #TALER_ARL_edb.  Update the deposit confirmation context accordingly.
 *
 * @param cls our `struct DepositConfirmationContext`
 * @param serial_id row of the @a dc in the database
 * @param dc the deposit confirmation we know
 * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop iterating
 */
static enum GNUNET_GenericReturnValue
test_dc (void *cls,
         uint64_t serial_id,
         const struct TALER_AUDITORDB_DepositConfirmation *dc)
{
  struct DepositConfirmationContext *dcc = cls;
  bool missing = false;

  dcc->last_seen_coin_serial = serial_id;
  for (unsigned int i = 0; i < dc->num_coins; i++)
  {
    enum GNUNET_DB_QueryStatus qs;
    struct GNUNET_TIME_Timestamp exchange_timestamp;
    struct TALER_Amount deposit_fee;

    qs = TALER_ARL_edb->have_deposit2 (TALER_ARL_edb->cls,
                                       &dc->h_contract_terms,
                                       &dc->h_wire,
                                       &dc->coin_pubs[i],
                                       &dc->merchant,
                                       dc->refund_deadline,
                                       &deposit_fee,
                                       &exchange_timestamp);
    missing |= (0 == qs);
    if (qs < 0)
    {
      GNUNET_break (0); /* DB error, complain */
      dcc->qs = qs;
      return GNUNET_SYSERR;
    }
  }
  if (! missing)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Found deposit %s in exchange database\n",
                GNUNET_h2s (&dc->h_contract_terms.hash));
    if (TALER_ARL_do_abort ())
      return GNUNET_SYSERR;
    return GNUNET_OK; /* all coins found, all good */
  }
  /* deposit confirmation missing! report! */
  TALER_ARL_report (
    report_deposit_confirmation_inconsistencies,
    GNUNET_JSON_PACK (
      TALER_JSON_pack_time_abs_human ("timestamp",
                                      dc->exchange_timestamp.abs_time),
      TALER_JSON_pack_amount ("amount",
                              &dc->total_without_fee),
      GNUNET_JSON_pack_uint64 ("rowid",
                               serial_id),
      GNUNET_JSON_pack_data_auto ("account",
                                  &dc->h_wire)));
  dcc->first_missed_coin_serial = GNUNET_MIN (dcc->first_missed_coin_serial,
                                              serial_id);
  dcc->missed_count++;
  TALER_ARL_amount_add (&dcc->missed_amount,
                        &dcc->missed_amount,
                        &dc->total_without_fee);
  if (TALER_ARL_do_abort ())
    return GNUNET_SYSERR;
  return GNUNET_OK;
}


/**
 * Check that the deposit-confirmations that were reported to
 * us by merchants are also in the exchange's database.
 *
 * @param cls closure
 * @return transaction status code
 */
static enum GNUNET_DB_QueryStatus
analyze_deposit_confirmations (void *cls)
{
  TALER_ARL_DEF_PP (deposit_confirmation_serial_id);
  struct DepositConfirmationContext dcc;
  enum GNUNET_DB_QueryStatus qs;
  enum GNUNET_DB_QueryStatus qsx;
  enum GNUNET_DB_QueryStatus qsp;
  (void) cls;

  qsp = TALER_ARL_adb->get_auditor_progress (
    TALER_ARL_adb->cls,
    TALER_ARL_GET_PP (deposit_confirmation_serial_id),
    NULL);

  if (0 > qsp)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qsp);
    return qsp;
  }
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qsp)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
                "First analysis using deposit auditor, starting audit from scratch\n");
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Resuming deposit confirmation audit at %llu\n",
                (unsigned long long) TALER_ARL_USE_PP (
                  deposit_confirmation_serial_id));
  }

  /* setup 'cc' */
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &dcc.missed_amount));
  dcc.qs = GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
  dcc.missed_count = 0LLU;
  dcc.first_missed_coin_serial = UINT64_MAX;
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "lastdepconfserialid %lu\n",
              TALER_ARL_USE_PP (deposit_confirmation_serial_id));
  qsx = TALER_ARL_adb->get_deposit_confirmations (
    TALER_ARL_adb->cls,
    TALER_ARL_USE_PP (deposit_confirmation_serial_id),
    true, /* return suppressed */
    &test_dc,
    &dcc);
  if (0 > qsx)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qsx);
    return qsx;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Analyzed %d deposit confirmations (above serial ID %llu)\n",
              (int) qsx,
              (unsigned long long) TALER_ARL_USE_PP (
                deposit_confirmation_serial_id));
  if (0 > dcc.qs)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == dcc.qs);
    return dcc.qs;
  }

  /* if (UINT64_MAX == dcc.first_missed_coin_serial)
     ppdc.last_deposit_confirmation_serial_id = dcc.last_seen_coin_serial;
   else
     ppdc.last_deposit_confirmation_serial_id = dcc.first_missed_coin_serial - 1;
 */
  /* sync 'cc' back to disk */
  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qsp)
    qs = TALER_ARL_adb->update_auditor_progress (
      TALER_ARL_adb->cls,
      TALER_ARL_SET_PP (deposit_confirmation_serial_id),
      NULL);
  else
    qs = TALER_ARL_adb->insert_auditor_progress (
      TALER_ARL_adb->cls,
      TALER_ARL_SET_PP (deposit_confirmation_serial_id),
      NULL);
  if (0 >= qs)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Failed to update auditor DB, not recording progress\n");
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }

  number_missed_deposit_confirmations = (json_int_t) dcc.missed_count;
  total_missed_deposit_confirmations = dcc.missed_amount;

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Concluded deposit confirmation audit step at %llu\n",
              (unsigned long long) TALER_ARL_USE_PP (
                deposit_confirmation_serial_id));
  return qs;
}


/**
 * Function called on events received from Postgres.
 *
 * @param cls closure, NULL
 * @param extra additional event data provided
 * @param extra_size number of bytes in @a extra
 */
static void
db_notify (void *cls,
           const void *extra,
           size_t extra_size)
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Received notification for new deposit_confirmation\n");

  (void) cls;
  (void) extra;
  (void) extra_size;

  if (NULL ==
      (db_plugin = TALER_AUDITORDB_plugin_load (cfg)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to initialize DB subsystem\n");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_assert (NULL !=
                 (report_deposit_confirmation_inconsistencies = json_array ()));

  if (GNUNET_OK !=
      TALER_ARL_setup_sessions_and_run (&analyze_deposit_confirmations,
                                        NULL))
  {
    global_ret = EXIT_FAILURE;
    return;
  }

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Deposit audit complete\n");
  TALER_ARL_done (
    GNUNET_JSON_PACK (
      GNUNET_JSON_pack_array_steal ("deposit_confirmation_inconsistencies",
                                    report_deposit_confirmation_inconsistencies),
      GNUNET_JSON_pack_uint64 ("missing_deposit_confirmation_count",
                               number_missed_deposit_confirmations),
      TALER_JSON_pack_amount ("missing_deposit_confirmation_total",
                              &total_missed_deposit_confirmations),
      TALER_JSON_pack_time_abs_human ("auditor_start_time",
                                      start_time),
      TALER_JSON_pack_time_abs_human ("auditor_end_time",
                                      GNUNET_TIME_absolute_get ())));
}


/**
 * Function called on shutdown.
 */
static void
do_shutdown (void *cls)
{
  (void) cls;

  db_plugin->event_listen_cancel (eh);
  eh = NULL;
  TALER_AUDITORDB_plugin_unload (db_plugin);
  db_plugin = NULL;
  TALER_ARL_done (NULL);
}


/**
 * Main function that will be run.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param c configuration
 */
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  (void) cls;
  (void) args;
  (void) cfgfile;
  cfg = c;

  GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
                                 NULL);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Launching deposit auditor\n");
  if (GNUNET_OK !=
      TALER_ARL_init (c))
  {
    global_ret = EXIT_FAILURE;
    return;
  }

  if (NULL ==
      (db_plugin = TALER_AUDITORDB_plugin_load (cfg)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to initialize DB subsystem\n");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (GNUNET_OK !=
      db_plugin->preflight (db_plugin->cls))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to connect to database\n");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }

  struct GNUNET_DB_EventHeaderP es = {
    .size = htons (sizeof (es)),
    .type = htons (TALER_DBEVENT_EXCHANGE_AUDITOR_NEW_DEPOSIT_CONFIRMATION)
  };
  eh = db_plugin->event_listen (db_plugin->cls,
                                &es,
                                GNUNET_TIME_UNIT_FOREVER_REL,
                                &db_notify,
                                NULL);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Starting deposit audit\n");
  GNUNET_assert (NULL !=
                 (report_deposit_confirmation_inconsistencies = json_array ()));
  if (GNUNET_OK !=
      TALER_ARL_setup_sessions_and_run (&analyze_deposit_confirmations,
                                        NULL))
  {
    global_ret = EXIT_FAILURE;
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Deposit audit complete\n");
  TALER_ARL_done (
    GNUNET_JSON_PACK (
      GNUNET_JSON_pack_array_steal ("deposit_confirmation_inconsistencies",
                                    report_deposit_confirmation_inconsistencies),
      GNUNET_JSON_pack_uint64 ("missing_deposit_confirmation_count",
                               number_missed_deposit_confirmations),
      TALER_JSON_pack_amount ("missing_deposit_confirmation_total",
                              &total_missed_deposit_confirmations),
      TALER_JSON_pack_time_abs_human ("auditor_start_time",
                                      start_time),
      TALER_JSON_pack_time_abs_human ("auditor_end_time",
                                      GNUNET_TIME_absolute_get ())));
}


/**
 * The main function of the deposit auditing helper tool.
 *
 * @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)
{
  const struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_flag ('i',
                               "internal",
                               "perform checks only applicable for exchange-internal audits",
                               &internal_checks),
    GNUNET_GETOPT_option_flag ('t',
                               "test",
                               "run in test mode and exit when idle",
                               &test_mode),
    GNUNET_GETOPT_option_timetravel ('T',
                                     "timetravel"),
    GNUNET_GETOPT_OPTION_END
  };
  enum GNUNET_GenericReturnValue ret;

  /* force linker to link against libtalerutil; if we do
     not do this, the linker may "optimize" libtalerutil
     away and skip #TALER_OS_init(), which we do need */
  (void) TALER_project_data_default ();
  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return EXIT_INVALIDARGUMENT;
  ret = GNUNET_PROGRAM_run (
    argc,
    argv,
    "taler-helper-auditor-deposits",
    gettext_noop (
      "Audit Taler exchange database for deposit confirmation consistency"),
    options,
    &run,
    NULL);
  GNUNET_free_nz ((void *) argv);
  if (GNUNET_SYSERR == ret)
    return EXIT_INVALIDARGUMENT;
  if (GNUNET_NO == ret)
    return EXIT_SUCCESS;
  return global_ret;
}


/* end of taler-helper-auditor-deposits.c */