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
|
/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 Inria & 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 exchangedb/exchangedb_denomkeys.c
* @brief I/O operations for the Exchange's denomination private keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_exchangedb_lib.h"
/**
* Import a denomination key from the given file.
*
* @param filename the file to import the key from
* @param[out] dki set to the imported denomination key
* @return #GNUNET_OK upon success;
* #GNUNET_SYSERR upon failure
*/
int
TALER_EXCHANGEDB_denomination_key_read (const char *filename,
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
{
uint64_t size;
size_t offset;
void *data;
struct GNUNET_CRYPTO_RsaPrivateKey *priv;
if (GNUNET_OK !=
GNUNET_DISK_file_size (filename,
&size,
GNUNET_YES,
GNUNET_YES))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Skipping inaccessable denomination key file `%s'\n",
filename);
return GNUNET_SYSERR;
}
offset = sizeof (struct TALER_EXCHANGEDB_DenominationKeyInformationP);
if (size <= offset)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
data = GNUNET_malloc (size);
if (size !=
GNUNET_DISK_fn_read (filename,
data,
size))
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
"read",
filename);
GNUNET_free (data);
return GNUNET_SYSERR;
}
if (NULL ==
(priv = GNUNET_CRYPTO_rsa_private_key_decode (data + offset,
size - offset)))
{
GNUNET_free (data);
return GNUNET_SYSERR;
}
GNUNET_assert (NULL == dki->denom_priv.rsa_private_key);
dki->denom_priv.rsa_private_key = priv;
dki->denom_pub.rsa_public_key
= GNUNET_CRYPTO_rsa_private_key_get_public (priv);
memcpy (&dki->issue,
data,
offset);
GNUNET_free (data);
return GNUNET_OK;
}
/**
* Exports a denomination key to the given file.
*
* @param filename the file where to write the denomination key
* @param dki the denomination key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_denomination_key_write (const char *filename,
const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
{
char *priv_enc;
size_t priv_enc_size;
struct GNUNET_DISK_FileHandle *fh;
ssize_t wrote;
size_t wsize;
int ret;
fh = NULL;
priv_enc_size
= GNUNET_CRYPTO_rsa_private_key_encode (dki->denom_priv.rsa_private_key,
&priv_enc);
ret = GNUNET_SYSERR;
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (filename))
return GNUNET_SYSERR;
if (NULL == (fh = GNUNET_DISK_file_open
(filename,
GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_TRUNCATE,
GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE)))
goto cleanup;
wsize = sizeof (struct TALER_EXCHANGEDB_DenominationKeyInformationP);
if (GNUNET_SYSERR == (wrote = GNUNET_DISK_file_write (fh,
&dki->issue,
wsize)))
goto cleanup;
if (wrote != wsize)
goto cleanup;
if (GNUNET_SYSERR ==
(wrote = GNUNET_DISK_file_write (fh,
priv_enc,
priv_enc_size)))
goto cleanup;
if (wrote != priv_enc_size)
goto cleanup;
ret = GNUNET_OK;
cleanup:
GNUNET_free_non_null (priv_enc);
if (NULL != fh)
(void) GNUNET_DISK_file_close (fh);
return ret;
}
/**
* Closure for #denomkeys_iterate_keydir_iter() and
* #denomkeys_iterate_topdir_iter().
*/
struct DenomkeysIterateContext
{
/**
* Set to the name of the directory below the top-level directory
* during the call to #denomkeys_iterate_keydir_iter().
*/
const char *alias;
/**
* Function to call on each denomination key.
*/
TALER_EXCHANGEDB_DenominationKeyIterator it;
/**
* Closure for @e it.
*/
void *it_cls;
};
/**
* Decode the denomination key in the given file @a filename and call
* the callback in @a cls with the information.
*
* @param cls the `struct DenomkeysIterateContext *`
* @param filename name of a file that should contain
* a denomination key
* @return #GNUNET_OK to continue to iterate
* #GNUNET_NO to abort iteration with success
* #GNUNET_SYSERR to abort iteration with failure
*/
static int
denomkeys_iterate_keydir_iter (void *cls,
const char *filename)
{
struct DenomkeysIterateContext *dic = cls;
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation issue;
int ret;
memset (&issue, 0, sizeof (issue));
if (GNUNET_OK !=
TALER_EXCHANGEDB_denomination_key_read (filename,
&issue))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Invalid denomkey file: '%s'\n",
filename);
return GNUNET_OK;
}
ret = dic->it (dic->it_cls,
dic->alias,
&issue);
GNUNET_CRYPTO_rsa_private_key_free (issue.denom_priv.rsa_private_key);
GNUNET_CRYPTO_rsa_public_key_free (issue.denom_pub.rsa_public_key);
return ret;
}
/**
* Function called on each subdirectory in the #TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS. Will
* call the #denomkeys_iterate_keydir_iter() on each file in the
* subdirectory.
*
* @param cls the `struct DenomkeysIterateContext *`
* @param filename name of the subdirectory to scan
* @return #GNUNET_OK on success,
* #GNUNET_SYSERR if we need to abort
*/
static int
denomkeys_iterate_topdir_iter (void *cls,
const char *filename)
{
struct DenomkeysIterateContext *dic = cls;
dic->alias = GNUNET_STRINGS_get_short_name (filename);
if (0 > GNUNET_DISK_directory_scan (filename,
&denomkeys_iterate_keydir_iter,
dic))
return GNUNET_SYSERR;
return GNUNET_OK;
}
/**
* Call @a it for each denomination key found in the @a exchange_base_dir.
*
* @param exchange_base_dir base directory for the exchange,
* the signing keys must be in the #TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS
* subdirectory
* @param it function to call on each denomination key found
* @param it_cls closure for @a it
* @return -1 on error, 0 if no files were found, otherwise
* a positive number (however, even with a positive
* number it is possible that @a it was never called
* as maybe none of the files were well-formed)
*/
int
TALER_EXCHANGEDB_denomination_keys_iterate (const char *exchange_base_dir,
TALER_EXCHANGEDB_DenominationKeyIterator it,
void *it_cls)
{
char *dir;
struct DenomkeysIterateContext dic;
int ret;
GNUNET_asprintf (&dir,
"%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS,
exchange_base_dir);
dic.it = it;
dic.it_cls = it_cls;
ret = GNUNET_DISK_directory_scan (dir,
&denomkeys_iterate_topdir_iter,
&dic);
GNUNET_free (dir);
return ret;
}
/* end of exchangedb_denomkeys.c */
|
