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
|
/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 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, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-keycheck.c
* @brief Check exchange keys for validity. Reads the signing and denomination
* keys from the exchange directory and checks to make sure they are
* well-formed. This is purely a diagnostic tool.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include <platform.h>
#include <gnunet/gnunet_util_lib.h>
#include "taler_exchangedb_lib.h"
/**
* Exchange directory with the keys.
*/
static char *exchange_directory;
/**
* Our configuration.
*/
static const struct GNUNET_CONFIGURATION_Handle *kcfg;
/**
* Return value from main().
*/
static int global_ret;
/**
* Function called on each signing key.
*
* @param cls closure (NULL)
* @param filename name of the file the key came from
* @param ski the sign key
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
static int
signkeys_iter (void *cls,
const char *filename,
const struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP *ski)
{
(void) cls;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Iterating over key `%s' for start time %s\n",
filename,
GNUNET_STRINGS_absolute_time_to_string
(GNUNET_TIME_absolute_ntoh (ski->issue.start)));
if (ntohl (ski->issue.purpose.size) !=
(sizeof (struct TALER_ExchangeSigningKeyValidityPS)))
{
fprintf (stderr,
"Signing key `%s' has invalid purpose size\n",
filename);
return GNUNET_SYSERR;
}
if ( (0 != GNUNET_TIME_absolute_ntoh (ski->issue.start).abs_value_us
% 1000000) ||
(0 != GNUNET_TIME_absolute_ntoh (ski->issue.expire).abs_value_us
% 1000000) ||
(0 != GNUNET_TIME_absolute_ntoh (ski->issue.end).abs_value_us
% 1000000) )
{
fprintf (stderr,
"Timestamps are not multiples of a round second\n");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY,
&ski->issue.purpose,
&ski->master_sig.eddsa_signature,
&ski->issue.master_public_key.eddsa_pub))
{
fprintf (stderr,
"Signing key `%s' has invalid signature\n",
filename);
return GNUNET_SYSERR;
}
printf ("Signing key `%s' valid\n",
filename);
return GNUNET_OK;
}
/**
* Check signing keys.
*
* @return #GNUNET_OK if the keys are OK
* #GNUNET_NO if not
*/
static int
exchange_signkeys_check ()
{
if (0 > TALER_EXCHANGEDB_signing_keys_iterate (exchange_directory,
&signkeys_iter,
NULL))
return GNUNET_NO;
return GNUNET_OK;
}
/**
* Function called on each denomination key.
*
* @param cls closure (NULL)
* @param dki the denomination key
* @param alias coin alias
* @return #GNUNET_OK to continue to iterate,
* #GNUNET_NO to stop iteration with no error,
* #GNUNET_SYSERR to abort iteration with error!
*/
static int
denomkeys_iter (void *cls,
const char *alias,
const struct
TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
{
struct GNUNET_HashCode hc;
(void) cls;
if (ntohl (dki->issue.properties.purpose.size) !=
sizeof (struct TALER_DenominationKeyValidityPS))
{
fprintf (stderr,
"Denomination key for `%s' has invalid purpose size\n",
alias);
return GNUNET_SYSERR;
}
if ( (0 != GNUNET_TIME_absolute_ntoh (
dki->issue.properties.start).abs_value_us % 1000000) ||
(0 != GNUNET_TIME_absolute_ntoh (
dki->issue.properties.expire_withdraw).abs_value_us % 1000000) ||
(0 != GNUNET_TIME_absolute_ntoh (
dki->issue.properties.expire_legal).abs_value_us % 1000000) ||
(0 != GNUNET_TIME_absolute_ntoh (
dki->issue.properties.expire_deposit).abs_value_us % 1000000) )
{
fprintf (stderr,
"Timestamps are not multiples of a round second\n");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (
TALER_SIGNATURE_MASTER_DENOMINATION_KEY_VALIDITY,
&dki->issue.properties.purpose,
&dki->issue.signature.eddsa_signature,
&dki->issue.properties.master.eddsa_pub))
{
fprintf (stderr,
"Denomination key for `%s' has invalid signature\n",
alias);
return GNUNET_SYSERR;
}
GNUNET_CRYPTO_rsa_public_key_hash (dki->denom_pub.rsa_public_key,
&hc);
if (0 != GNUNET_memcmp (&hc,
&dki->issue.properties.denom_hash))
{
fprintf (stderr,
"Public key for `%s' does not match signature\n",
alias);
return GNUNET_SYSERR;
}
printf ("Denomination key `%s' (%s) is valid\n",
alias,
GNUNET_h2s (&hc));
return GNUNET_OK;
}
/**
* Check denomination keys.
*
* @return #GNUNET_OK if the keys are OK
* #GNUNET_NO if not
*/
static int
exchange_denomkeys_check ()
{
struct TALER_MasterPublicKeyP 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");
global_ret = 1;
return GNUNET_NO;
}
if (0 > TALER_EXCHANGEDB_denomination_keys_iterate (exchange_directory,
&denomkeys_iter,
NULL))
return GNUNET_NO;
return GNUNET_OK;
}
/**
* 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 cfg configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
(void) cls;
(void) args;
(void) cfgfile;
kcfg = cfg;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (kcfg,
"exchange",
"KEYDIR",
&exchange_directory))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"exchange",
"KEYDIR");
global_ret = 1;
return;
}
if ( (GNUNET_OK != exchange_signkeys_check ()) ||
(GNUNET_OK != exchange_denomkeys_check ()) )
{
global_ret = 1;
return;
}
}
/**
* The main function of the keyup 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_END
};
GNUNET_assert (GNUNET_OK ==
GNUNET_log_setup ("taler-exchange-keycheck",
"WARNING",
NULL));
if (GNUNET_OK !=
GNUNET_PROGRAM_run (argc, argv,
"taler-exchange-keycheck",
"Check keys of the exchange for validity",
options,
&run, NULL))
return 1;
return global_ret;
}
/* end of taler-exchange-keycheck.c */
|
