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
|
/******************************************************
Copyright (c) 2013, 2017 Percona LLC and/or its affiliates.
Encryption configuration file interface for XtraBackup.
This program 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; version 2 of the License.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*******************************************************/
#include <my_base.h>
#include "common.h"
#include "xbcrypt.h"
#include "xbcrypt_common.h"
/* Encryption options */
char *ds_encrypt_key = NULL;
char *ds_encrypt_key_file = NULL;
ulong ds_encrypt_algo;
static uint encrypt_key_len;
static uint encrypt_iv_len;
static const uint encrypt_mode = GCRY_CIPHER_MODE_CTR;
static uint encrypt_algos[] = { GCRY_CIPHER_NONE, GCRY_CIPHER_AES128,
GCRY_CIPHER_AES192, GCRY_CIPHER_AES256 };
static uint encrypt_algo;
#if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
GCRY_THREAD_OPTION_PTHREAD_IMPL;
#endif
my_bool
xb_crypt_read_key_file(const char *filename, void** key, uint *keylength)
{
FILE *fp;
if (!(fp = my_fopen(filename, O_RDONLY, MYF(0)))) {
msg("%s:%s: unable to open config file \"%s\", errno(%d)\n",
my_progname, __FUNCTION__, filename, my_errno);
return FALSE;
}
fseek(fp, 0 , SEEK_END);
*keylength = ftell(fp);
rewind(fp);
*key = my_malloc(*keylength, MYF(MY_FAE));
*keylength = fread(*key, 1, *keylength, fp);
my_fclose(fp, MYF(0));
return TRUE;
}
void
xb_crypt_create_iv(void* ivbuf, size_t ivlen)
{
gcry_create_nonce(ivbuf, ivlen);
}
gcry_error_t
xb_crypt_init(uint *iv_len)
{
gcry_error_t gcry_error;
/* Acording to gcrypt docs (and my testing), setting up the threading
callbacks must be done first, so, lets give it a shot */
#if !defined(GCRYPT_VERSION_NUMBER) || (GCRYPT_VERSION_NUMBER < 0x010600)
gcry_error = gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
if (gcry_error) {
msg("encryption: unable to set libgcrypt thread cbs - "
"%s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
#endif
/* Version check should be the very next call because it
makes sure that important subsystems are intialized. */
if (!gcry_control(GCRYCTL_ANY_INITIALIZATION_P)) {
const char *gcrypt_version;
gcrypt_version = gcry_check_version(NULL);
/* No other library has already initialized libgcrypt. */
if (!gcrypt_version) {
msg("encryption: failed to initialize libgcrypt\n");
return 1;
} else {
msg("encryption: using gcrypt %s\n", gcrypt_version);
}
}
/* Disable the gcry secure memory, not dealing with this for now */
gcry_error = gcry_control(GCRYCTL_DISABLE_SECMEM, 0);
if (gcry_error) {
msg("encryption: unable to disable libgcrypt secmem - "
"%s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
/* Finalize gcry initialization. */
gcry_error = gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
if (gcry_error) {
msg("encryption: unable to finish libgcrypt initialization - "
"%s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
/* Determine the algorithm */
encrypt_algo = encrypt_algos[ds_encrypt_algo];
/* Set up the iv length */
encrypt_iv_len = gcry_cipher_get_algo_blklen(encrypt_algo);
xb_a(encrypt_iv_len > 0);
if (iv_len != NULL) {
*iv_len = encrypt_iv_len;
}
/* Now set up the key */
if (ds_encrypt_key == NULL &&
ds_encrypt_key_file == NULL) {
msg("encryption: no encryption key or key file specified.\n");
return gcry_error;
} else if (ds_encrypt_key && ds_encrypt_key_file) {
msg("encryption: both encryption key and key file specified.\n");
return gcry_error;
} else if (ds_encrypt_key_file) {
if (!xb_crypt_read_key_file(ds_encrypt_key_file,
(void**)&ds_encrypt_key,
&encrypt_key_len)) {
msg("encryption: unable to read encryption key file"
" \"%s\".\n", ds_encrypt_key_file);
return gcry_error;
}
} else if (ds_encrypt_key) {
encrypt_key_len = strlen(ds_encrypt_key);
} else {
msg("encryption: no encryption key or key file specified.\n");
return gcry_error;
}
return 0;
}
gcry_error_t
xb_crypt_cipher_open(gcry_cipher_hd_t *cipher_handle)
{
if (encrypt_algo != GCRY_CIPHER_NONE) {
gcry_error_t gcry_error;
gcry_error = gcry_cipher_open(cipher_handle,
encrypt_algo,
encrypt_mode, 0);
if (gcry_error) {
msg("encryption: unable to open libgcrypt"
" cipher - %s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
gcry_cipher_close(*cipher_handle);
return gcry_error;
}
gcry_error = gcry_cipher_setkey(*cipher_handle,
ds_encrypt_key,
encrypt_key_len);
if (gcry_error) {
msg("encryption: unable to set libgcrypt"
" cipher key - %s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
gcry_cipher_close(*cipher_handle);
return gcry_error;
}
return gcry_error;
}
return 0;
}
void
xb_crypt_cipher_close(gcry_cipher_hd_t cipher_handle)
{
if (encrypt_algo != GCRY_CIPHER_NONE)
gcry_cipher_close(cipher_handle);
}
gcry_error_t
xb_crypt_decrypt(gcry_cipher_hd_t cipher_handle, const uchar *from,
size_t from_len, uchar *to, size_t *to_len,
const uchar *iv, size_t iv_len, my_bool hash_appended)
{
*to_len = from_len;
if (encrypt_algo != GCRY_CIPHER_NONE) {
gcry_error_t gcry_error;
gcry_error = gcry_cipher_reset(cipher_handle);
if (gcry_error) {
msg("%s:encryption: unable to reset libgcrypt"
" cipher - %s : %s\n", my_progname,
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
if (iv_len > 0) {
gcry_error = gcry_cipher_setctr(cipher_handle,
iv, iv_len);
}
if (gcry_error) {
msg("%s:encryption: unable to set cipher iv - "
"%s : %s\n", my_progname,
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
/* Try to decrypt it */
gcry_error = gcry_cipher_decrypt(cipher_handle, to, *to_len,
from, from_len);
if (gcry_error) {
msg("%s:encryption: unable to decrypt chunk - "
"%s : %s\n", my_progname,
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
gcry_cipher_close(cipher_handle);
return gcry_error;
}
if (hash_appended) {
uchar hash[XB_CRYPT_HASH_LEN];
*to_len -= XB_CRYPT_HASH_LEN;
/* ensure that XB_CRYPT_HASH_LEN is the correct length
of XB_CRYPT_HASH hashing algorithm output */
xb_ad(gcry_md_get_algo_dlen(XB_CRYPT_HASH) ==
XB_CRYPT_HASH_LEN);
gcry_md_hash_buffer(XB_CRYPT_HASH, hash, to,
*to_len);
if (memcmp(hash, (char *) to + *to_len,
XB_CRYPT_HASH_LEN) != 0) {
msg("%s:%s invalid plaintext hash. "
"Wrong encrytion key specified?\n",
my_progname, __FUNCTION__);
return 1;
}
}
} else {
memcpy(to, from, *to_len);
}
return 0;
}
gcry_error_t
xb_crypt_encrypt(gcry_cipher_hd_t cipher_handle, const uchar *from,
size_t from_len, uchar *to, size_t *to_len, uchar *iv)
{
gcry_error_t gcry_error;
/* ensure that XB_CRYPT_HASH_LEN is the correct length
of XB_CRYPT_HASH hashing algorithm output */
xb_ad(gcry_md_get_algo_dlen(XB_CRYPT_HASH) ==
XB_CRYPT_HASH_LEN);
memcpy(to, from, from_len);
gcry_md_hash_buffer(XB_CRYPT_HASH, to + from_len,
from, from_len);
*to_len = from_len;
if (encrypt_algo != GCRY_CIPHER_NONE) {
gcry_error = gcry_cipher_reset(cipher_handle);
if (gcry_error) {
msg("encrypt: unable to reset cipher - "
"%s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
xb_crypt_create_iv(iv, encrypt_iv_len);
gcry_error = gcry_cipher_setctr(cipher_handle, iv,
encrypt_iv_len);
if (gcry_error) {
msg("encrypt: unable to set cipher ctr - "
"%s : %s\n",
gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
gcry_error = gcry_cipher_encrypt(cipher_handle, to,
*to_len + XB_CRYPT_HASH_LEN,
to,
from_len + XB_CRYPT_HASH_LEN);
if (gcry_error) {
msg("encrypt: unable to encrypt buffer - "
"%s : %s\n", gcry_strsource(gcry_error),
gcry_strerror(gcry_error));
return gcry_error;
}
} else {
memcpy(to, from, from_len + XB_CRYPT_HASH_LEN);
}
*to_len += XB_CRYPT_HASH_LEN;
return 0;
}
#endif
|
