aboutsummaryrefslogtreecommitdiff
path: root/src/exchange-tools/taler-auditor-sign.c
blob: 870f889ea9e79dfb0e31d353ac054a24f50acf9e (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
/*
  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-auditor-sign.c
 * @brief Tool used by the auditor to sign the exchange's master key and the
 *        denomination key(s).
 * @author Christian Grothoff
 */
#include <platform.h>
#include "taler_exchangedb_lib.h"


/**
 * Are we running in verbose mode?
 */
static int verbose;

/**
 * Filename of the auditor's private key.
 */
static char *auditor_key_file;

/**
 * Exchange's public key (in Crockford base32 encoding).
 */
static char *exchange_public_key;

/**
 * File with the Exchange's denomination keys to sign, itself
 * signed by the Exchange's public key.
 */
static char *exchange_request_file;

/**
 * Where should we write the auditor's signature?
 */
static char *output_file;

/**
 * URL of the auditor (informative for the user).
 */
static char *auditor_url;

/**
 * Master public key of the exchange.
 */
static struct TALER_MasterPublicKeyP master_public_key;


/**
 * Print denomination key details for diagnostics.
 *
 * @param dk denomination key to print
 */
static void
print_dk (const struct TALER_DenominationKeyValidityPS *dk)
{
  struct TALER_Amount a;
  char *s;

  fprintf (stdout,
           "Denomination key hash: %s\n",
           GNUNET_h2s_full (&dk->denom_hash));
  TALER_amount_ntoh (&a,
                     &dk->value);
  fprintf (stdout,
           "Value: %s\n",
           s = TALER_amount_to_string (&a));
  GNUNET_free (s);
    TALER_amount_ntoh (&a,
                       &dk->fee_withdraw);
  fprintf (stdout,
           "Withdraw fee: %s\n",
           s = TALER_amount_to_string (&a));
  GNUNET_free (s);
    TALER_amount_ntoh (&a,
                       &dk->fee_deposit);
  fprintf (stdout,
           "Deposit fee: %s\n",
           s = TALER_amount_to_string (&a));
  GNUNET_free (s);
  TALER_amount_ntoh (&a,
                     &dk->fee_refresh);
  fprintf (stdout,
           "Refresh fee: %s\n",
           s = TALER_amount_to_string (&a));
  GNUNET_free (s);

  fprintf (stdout,
           "Validity start time: %s\n",
           GNUNET_STRINGS_absolute_time_to_string (GNUNET_TIME_absolute_ntoh (dk->start)));
  fprintf (stdout,
           "Withdraw end time: %s\n",
           GNUNET_STRINGS_absolute_time_to_string (GNUNET_TIME_absolute_ntoh (dk->expire_withdraw)));
  fprintf (stdout,
           "Deposit end time: %s\n",
           GNUNET_STRINGS_absolute_time_to_string (GNUNET_TIME_absolute_ntoh (dk->expire_spend)));
  fprintf (stdout,
           "Legal dispute end time: %s\n",
           GNUNET_STRINGS_absolute_time_to_string (GNUNET_TIME_absolute_ntoh (dk->expire_legal)));

  fprintf (stdout,
           "\n");
}


/**
 * The main function of the taler-auditor-sign tool.  This tool is used
 * to sign a exchange's master and denomination keys, affirming that the
 * auditor is aware of them and will validate the exchange's database with
 * respect to these keys.
 *
 * @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[] = {
    {'a', "auditor-key", "FILE",
     "file containing the private key of the auditor", 1,
     &GNUNET_GETOPT_set_filename, &auditor_key_file},
    GNUNET_GETOPT_OPTION_HELP ("Private key of the auditor to use for signing"),
    {'m', "exchange-key", "KEY",
     "public key of the exchange (Crockford base32 encoded)", 1,
     &GNUNET_GETOPT_set_filename, &exchange_public_key},
    {'u', "auditor-url", "URL",
     "URL of the auditor (informative link for the user)", 1,
     &GNUNET_GETOPT_set_string, &auditor_url},
    {'r', "exchange-request", "FILE",
     "set of keys the exchange requested the auditor to sign", 1,
     &GNUNET_GETOPT_set_string, &exchange_request_file},
    {'o', "output", "FILE",
     "where to write our signature", 1,
     &GNUNET_GETOPT_set_string, &output_file},
    GNUNET_GETOPT_OPTION_VERSION (VERSION "-" VCS_VERSION),
    GNUNET_GETOPT_OPTION_VERBOSE (&verbose),
    GNUNET_GETOPT_OPTION_END
  };
  struct GNUNET_CRYPTO_EddsaPrivateKey *eddsa_priv;
  struct TALER_AuditorSignatureP *sigs;
  struct TALER_AuditorPublicKeyP apub;
  struct GNUNET_DISK_FileHandle *fh;
  struct TALER_DenominationKeyValidityPS *dks;
  unsigned int dks_len;
  struct TALER_ExchangeKeyValidityPS kv;
  off_t in_size;
  unsigned int i;

  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 == auditor_key_file)
  {
    fprintf (stderr,
             "Auditor key file not given\n");
    return 1;
  }
  if (NULL == auditor_url)
  {
    fprintf (stderr,
             "Auditor URL not given\n");
    return 1;
  }
  eddsa_priv = GNUNET_CRYPTO_eddsa_key_create_from_file (auditor_key_file);
  if (NULL == eddsa_priv)
  {
    fprintf (stderr,
             "Failed to initialize auditor key from file `%s'\n",
             auditor_key_file);
    return 1;
  }
  GNUNET_CRYPTO_eddsa_key_get_public (eddsa_priv,
                                      &apub.eddsa_pub);
  if (NULL == exchange_public_key)
  {
    fprintf (stderr,
             "Exchange public key not given\n");
    GNUNET_free (eddsa_priv);
    return 1;
  }
  if (GNUNET_OK !=
      GNUNET_STRINGS_string_to_data (exchange_public_key,
                                     strlen (exchange_public_key),
                                     &master_public_key,
                                     sizeof (master_public_key)))
  {
    fprintf (stderr,
             "Public key `%s' malformed\n",
             exchange_public_key);
    GNUNET_free (eddsa_priv);
    return 1;
  }
  if (NULL == exchange_request_file)
  {
    fprintf (stderr,
             "Exchange signing request not given\n");
    GNUNET_free (eddsa_priv);
    return 1;
  }
  fh = GNUNET_DISK_file_open (exchange_request_file,
                              GNUNET_DISK_OPEN_READ,
                              GNUNET_DISK_PERM_NONE);
  if (NULL == fh)
  {
    fprintf (stderr,
             "Failed to open file `%s': %s\n",
             exchange_request_file,
             STRERROR (errno));
    GNUNET_free (eddsa_priv);
    return 1;
  }
  if (GNUNET_OK !=
      GNUNET_DISK_file_handle_size (fh,
                                    &in_size))
  {
    fprintf (stderr,
             "Failed to obtain input file size `%s': %s\n",
             exchange_request_file,
             STRERROR (errno));
    GNUNET_DISK_file_close (fh);
    GNUNET_free (eddsa_priv);
    return 1;
  }
  if (0 != (in_size % sizeof (struct TALER_DenominationKeyValidityPS)))
  {
    fprintf (stderr,
             "Input file size of file `%s' is invalid\n",
             exchange_request_file);
    GNUNET_DISK_file_close (fh);
    GNUNET_free (eddsa_priv);
    return 1;
  }
  dks_len = in_size / sizeof (struct TALER_DenominationKeyValidityPS);
  kv.purpose.purpose = htonl (TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS);
  kv.purpose.size = htonl (sizeof (struct TALER_ExchangeKeyValidityPS));
  GNUNET_CRYPTO_hash (auditor_url,
                      strlen (auditor_url) + 1,
                      &kv.auditor_url_hash);
  kv.master = master_public_key;
  dks = GNUNET_new_array (dks_len,
                          struct TALER_DenominationKeyValidityPS);
  sigs = GNUNET_new_array (dks_len,
                           struct TALER_AuditorSignatureP);
  if (in_size !=
      GNUNET_DISK_file_read (fh,
                             dks,
                             in_size))
  {
    fprintf (stderr,
             "Failed to read input file `%s': %s\n",
             exchange_request_file,
             STRERROR (errno));
    GNUNET_DISK_file_close (fh);
    GNUNET_free (sigs);
    GNUNET_free (dks);
    GNUNET_free (eddsa_priv);
    return 1;
  }
  GNUNET_DISK_file_close (fh);
  for (i=0;i<dks_len;i++)
  {
    struct TALER_DenominationKeyValidityPS *dk = &dks[i];

    if (verbose)
      print_dk (dk);
    kv.start = dk->start;
    kv.expire_withdraw = dk->expire_withdraw;
    kv.expire_spend = dk->expire_spend;
    kv.expire_legal = dk->expire_legal;
    kv.value = dk->value;
    kv.fee_withdraw = dk->fee_withdraw;
    kv.fee_deposit = dk->fee_deposit;
    kv.fee_refresh = dk->fee_refresh;
    kv.denom_hash = dk->denom_hash;

    /* Finally sign ... */
    GNUNET_CRYPTO_eddsa_sign (eddsa_priv,
                              &kv.purpose,
                              &sigs[i].eddsa_sig);
  }

  if (NULL == output_file)
  {
    fprintf (stderr,
             "Output file not given\n");
    GNUNET_free (dks);
    GNUNET_free (sigs);
    GNUNET_free (eddsa_priv);
    return 1;
  }

  /* write result to disk */
  if (GNUNET_OK !=
      TALER_EXCHANGEDB_auditor_write (output_file,
                                      &apub,
                                      auditor_url,
                                      sigs,
                                      &master_public_key,
                                      dks_len,
                                      dks))
  {
    fprintf (stderr,
             "Failed to write to file `%s': %s\n",
             output_file,
             STRERROR (errno));
    GNUNET_free (sigs);
    GNUNET_free (dks);
    return 1;
  }
  GNUNET_free (sigs);
  GNUNET_free (dks);
  GNUNET_free (eddsa_priv);
  return 0;
}

/* end of taler-auditor-sign.c */