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
|
/* v3_scts.c */
/*
* Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2014.
*/
/* ====================================================================
* Copyright (c) 2014 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/x509v3.h>
/* Signature and hash algorithms from RFC 5246 */
#define TLSEXT_hash_sha256 4
#define TLSEXT_signature_rsa 1
#define TLSEXT_signature_ecdsa 3
#define n2s(c,s) ((s=(((unsigned int)(c[0]))<< 8)| \
(((unsigned int)(c[1])) )),c+=2)
#if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
# define SCT_TIMESTAMP unsigned __int64
#elif defined(__arch64__)
# define SCT_TIMESTAMP unsigned long
#else
# define SCT_TIMESTAMP unsigned long long
#endif
#define n2l8(c,l) (l =((SCT_TIMESTAMP)(*((c)++)))<<56, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<48, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<40, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<32, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<24, \
l|=((SCT_TIMESTAMP)(*((c)++)))<<16, \
l|=((SCT_TIMESTAMP)(*((c)++)))<< 8, \
l|=((SCT_TIMESTAMP)(*((c)++))))
typedef struct SCT_st {
/* The encoded SCT */
unsigned char *sct;
unsigned short sctlen;
/*
* Components of the SCT. "logid", "ext" and "sig" point to addresses
* inside "sct".
*/
unsigned char version;
unsigned char *logid;
unsigned short logidlen;
SCT_TIMESTAMP timestamp;
unsigned char *ext;
unsigned short extlen;
unsigned char hash_alg;
unsigned char sig_alg;
unsigned char *sig;
unsigned short siglen;
} SCT;
DECLARE_STACK_OF(SCT)
static void SCT_LIST_free(STACK_OF(SCT) *a);
static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
const unsigned char **pp, long length);
static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
BIO *out, int indent);
const X509V3_EXT_METHOD v3_ct_scts[] = {
{NID_ct_precert_scts, 0, NULL,
0, (X509V3_EXT_FREE)SCT_LIST_free,
(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
0, 0, 0, 0,
(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
NULL},
{NID_ct_cert_scts, 0, NULL,
0, (X509V3_EXT_FREE)SCT_LIST_free,
(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
0, 0, 0, 0,
(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
NULL},
};
static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
const unsigned char sig_alg)
{
int nid = NID_undef;
/* RFC6962 only permits two signature algorithms */
if (hash_alg == TLSEXT_hash_sha256) {
if (sig_alg == TLSEXT_signature_rsa)
nid = NID_sha256WithRSAEncryption;
else if (sig_alg == TLSEXT_signature_ecdsa)
nid = NID_ecdsa_with_SHA256;
}
if (nid == NID_undef)
BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
else
BIO_printf(out, "%s", OBJ_nid2ln(nid));
}
static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
{
ASN1_GENERALIZEDTIME *gen;
char genstr[20];
gen = ASN1_GENERALIZEDTIME_new();
ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
(int)(timestamp / 86400000),
(int)(timestamp % 86400000) / 1000);
/*
* Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
* characters long with a final Z. Update it with fractional seconds.
*/
BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
ASN1_STRING_data(gen), (unsigned int)(timestamp % 1000));
ASN1_GENERALIZEDTIME_set_string(gen, genstr);
ASN1_GENERALIZEDTIME_print(out, gen);
ASN1_GENERALIZEDTIME_free(gen);
}
static void SCT_free(SCT *sct)
{
if (sct) {
if (sct->sct)
OPENSSL_free(sct->sct);
OPENSSL_free(sct);
}
}
static void SCT_LIST_free(STACK_OF(SCT) *a)
{
sk_SCT_pop_free(a, SCT_free);
}
static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
const unsigned char **pp, long length)
{
ASN1_OCTET_STRING *oct = NULL;
STACK_OF(SCT) *sk = NULL;
SCT *sct;
unsigned char *p, *p2;
unsigned short listlen, sctlen = 0, fieldlen;
const unsigned char *q = *pp;
if (d2i_ASN1_OCTET_STRING(&oct, &q, length) == NULL)
return NULL;
if (oct->length < 2)
goto done;
p = oct->data;
n2s(p, listlen);
if (listlen != oct->length - 2)
goto done;
if ((sk = sk_SCT_new_null()) == NULL)
goto done;
while (listlen > 0) {
if (listlen < 2)
goto err;
n2s(p, sctlen);
listlen -= 2;
if ((sctlen < 1) || (sctlen > listlen))
goto err;
listlen -= sctlen;
sct = OPENSSL_malloc(sizeof(SCT));
if (!sct)
goto err;
if (!sk_SCT_push(sk, sct)) {
OPENSSL_free(sct);
goto err;
}
sct->sct = OPENSSL_malloc(sctlen);
if (!sct->sct)
goto err;
memcpy(sct->sct, p, sctlen);
sct->sctlen = sctlen;
p += sctlen;
p2 = sct->sct;
sct->version = *p2++;
if (sct->version == 0) { /* SCT v1 */
/*-
* Fixed-length header:
* struct {
* (1 byte) Version sct_version;
* (32 bytes) LogID id;
* (8 bytes) uint64 timestamp;
* (2 bytes + ?) CtExtensions extensions;
*/
if (sctlen < 43)
goto err;
sctlen -= 43;
sct->logid = p2;
sct->logidlen = 32;
p2 += 32;
n2l8(p2, sct->timestamp);
n2s(p2, fieldlen);
if (sctlen < fieldlen)
goto err;
sct->ext = p2;
sct->extlen = fieldlen;
p2 += fieldlen;
sctlen -= fieldlen;
/*-
* digitally-signed struct header:
* (1 byte) Hash algorithm
* (1 byte) Signature algorithm
* (2 bytes + ?) Signature
*/
if (sctlen < 4)
goto err;
sctlen -= 4;
sct->hash_alg = *p2++;
sct->sig_alg = *p2++;
n2s(p2, fieldlen);
if (sctlen != fieldlen)
goto err;
sct->sig = p2;
sct->siglen = fieldlen;
}
}
done:
ASN1_OCTET_STRING_free(oct);
*pp = q;
return sk;
err:
SCT_LIST_free(sk);
sk = NULL;
goto done;
}
static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
BIO *out, int indent)
{
SCT *sct;
int i;
for (i = 0; i < sk_SCT_num(sct_list
|