1 /* v3_scts.c */
2 /*
3 * Written by Rob Stradling (rob@comodo.com) for the OpenSSL project 2014.
4 */
5 /* ====================================================================
6 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/asn1.h>
62 #include <openssl/x509v3.h>
63
64 /* Signature and hash algorithms from RFC 5246 */
65 #define TLSEXT_hash_sha256 4
66
67 #define TLSEXT_signature_rsa 1
68 #define TLSEXT_signature_ecdsa 3
69
70
71 #define n2s(c,s) ((s=(((unsigned int)(c[0]))<< 8)| \
72 (((unsigned int)(c[1])) )),c+=2)
73
74 #if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
75 # define SCT_TIMESTAMP unsigned __int64
76 #elif defined(__arch64__)
77 # define SCT_TIMESTAMP unsigned long
78 #else
79 # define SCT_TIMESTAMP unsigned long long
80 #endif
81
82 #define n2l8(c,l) (l =((SCT_TIMESTAMP)(*((c)++)))<<56, \
83 l|=((SCT_TIMESTAMP)(*((c)++)))<<48, \
84 l|=((SCT_TIMESTAMP)(*((c)++)))<<40, \
85 l|=((SCT_TIMESTAMP)(*((c)++)))<<32, \
86 l|=((SCT_TIMESTAMP)(*((c)++)))<<24, \
87 l|=((SCT_TIMESTAMP)(*((c)++)))<<16, \
88 l|=((SCT_TIMESTAMP)(*((c)++)))<< 8, \
89 l|=((SCT_TIMESTAMP)(*((c)++))))
90
91 typedef struct SCT_st {
92 /* The encoded SCT */
93 unsigned char *sct;
94 unsigned short sctlen;
95 /*
96 * Components of the SCT. "logid", "ext" and "sig" point to addresses
97 * inside "sct".
98 */
99 unsigned char version;
100 unsigned char *logid;
101 unsigned short logidlen;
102 SCT_TIMESTAMP timestamp;
103 unsigned char *ext;
104 unsigned short extlen;
105 unsigned char hash_alg;
106 unsigned char sig_alg;
107 unsigned char *sig;
108 unsigned short siglen;
109 } SCT;
110
111 DECLARE_STACK_OF(SCT)
112
113 static void SCT_LIST_free(STACK_OF(SCT) *a);
114 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
115 const unsigned char **pp, long length);
116 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
117 BIO *out, int indent);
118
119 const X509V3_EXT_METHOD v3_ct_scts[] = {
120 {NID_ct_precert_scts, 0, NULL,
121 0, (X509V3_EXT_FREE)SCT_LIST_free,
122 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
123 0, 0, 0, 0,
124 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
125 NULL},
126
127 {NID_ct_cert_scts, 0, NULL,
128 0, (X509V3_EXT_FREE)SCT_LIST_free,
129 (X509V3_EXT_D2I)d2i_SCT_LIST, 0,
130 0, 0, 0, 0,
131 (X509V3_EXT_I2R)i2r_SCT_LIST, 0,
132 NULL},
133 };
134
tls12_signature_print(BIO * out,const unsigned char hash_alg,const unsigned char sig_alg)135 static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
136 const unsigned char sig_alg)
137 {
138 int nid = NID_undef;
139 /* RFC6962 only permits two signature algorithms */
140 if (hash_alg == TLSEXT_hash_sha256) {
141 if (sig_alg == TLSEXT_signature_rsa)
142 nid = NID_sha256WithRSAEncryption;
143 else if (sig_alg == TLSEXT_signature_ecdsa)
144 nid = NID_ecdsa_with_SHA256;
145 }
146 if (nid == NID_undef)
147 BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
148 else
149 BIO_printf(out, "%s", OBJ_nid2ln(nid));
150 }
151
timestamp_print(BIO * out,SCT_TIMESTAMP timestamp)152 static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
153 {
154 ASN1_GENERALIZEDTIME *gen;
155 char genstr[20];
156 gen = ASN1_GENERALIZEDTIME_new();
157 ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
158 (int)(timestamp / 86400000),
159 (timestamp % 86400000) / 1000);
160 /*
161 * Note GeneralizedTime from ASN1_GENERALIZETIME_adj is always 15
162 * characters long with a final Z. Update it with fractional seconds.
163 */
164 BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
165 ASN1_STRING_data(gen), (unsigned int)(timestamp % 1000));
166 ASN1_GENERALIZEDTIME_set_string(gen, genstr);
167 ASN1_GENERALIZEDTIME_print(out, gen);
168 ASN1_GENERALIZEDTIME_free(gen);
169 }
170
SCT_free(SCT * sct)171 static void SCT_free(SCT *sct)
172 {
173 if (sct) {
174 if (sct->sct)
175 OPENSSL_free(sct->sct);
176 OPENSSL_free(sct);
177 }
178 }
179
SCT_LIST_free(STACK_OF (SCT)* a)180 static void SCT_LIST_free(STACK_OF(SCT) *a)
181 {
182 sk_SCT_pop_free(a, SCT_free);
183 }
184
STACK_OF(SCT)185 static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
186 const unsigned char **pp, long length)
187 {
188 ASN1_OCTET_STRING *oct = NULL;
189 STACK_OF(SCT) *sk = NULL;
190 SCT *sct;
191 unsigned char *p, *p2;
192 unsigned short listlen, sctlen = 0, fieldlen;
193 const unsigned char *q = *pp;
194
195 if (d2i_ASN1_OCTET_STRING(&oct, &q, length) == NULL)
196 return NULL;
197 if (oct->length < 2)
198 goto done;
199 p = oct->data;
200 n2s(p, listlen);
201 if (listlen != oct->length - 2)
202 goto done;
203
204 if ((sk = sk_SCT_new_null()) == NULL)
205 goto done;
206
207 while (listlen > 0) {
208 if (listlen < 2)
209 goto err;
210 n2s(p, sctlen);
211 listlen -= 2;
212
213 if ((sctlen < 1) || (sctlen > listlen))
214 goto err;
215 listlen -= sctlen;
216
217 sct = OPENSSL_malloc(sizeof(SCT));
218 if (!sct)
219 goto err;
220 if (!sk_SCT_push(sk, sct)) {
221 OPENSSL_free(sct);
222 goto err;
223 }
224
225 sct->sct = OPENSSL_malloc(sctlen);
226 if (!sct->sct)
227 goto err;
228 memcpy(sct->sct, p, sctlen);
229 sct->sctlen = sctlen;
230 p += sctlen;
231 p2 = sct->sct;
232
233 sct->version = *p2++;
234 if (sct->version == 0) { /* SCT v1 */
235 /*-
236 * Fixed-length header:
237 * struct {
238 * (1 byte) Version sct_version;
239 * (32 bytes) LogID id;
240 * (8 bytes) uint64 timestamp;
241 * (2 bytes + ?) CtExtensions extensions;
242 */
243 if (sctlen < 43)
244 goto err;
245 sctlen -= 43;
246
247 sct->logid = p2;
248 sct->logidlen = 32;
249 p2 += 32;
250
251 n2l8(p2, sct->timestamp);
252
253 n2s(p2, fieldlen);
254 if (sctlen < fieldlen)
255 goto err;
256 sct->ext = p2;
257 sct->extlen = fieldlen;
258 p2 += fieldlen;
259 sctlen -= fieldlen;
260
261 /*-
262 * digitally-signed struct header:
263 * (1 byte) Hash algorithm
264 * (1 byte) Signature algorithm
265 * (2 bytes + ?) Signature
266 */
267 if (sctlen < 4)
268 goto err;
269 sctlen -= 4;
270
271 sct->hash_alg = *p2++;
272 sct->sig_alg = *p2++;
273 n2s(p2, fieldlen);
274 if (sctlen != fieldlen)
275 goto err;
276 sct->sig = p2;
277 sct->siglen = fieldlen;
278 }
279 }
280
281 done:
282 ASN1_OCTET_STRING_free(oct);
283 *pp = q;
284 return sk;
285
286 err:
287 SCT_LIST_free(sk);
288 sk = NULL;
289 goto done;
290 }
291
i2r_SCT_LIST(X509V3_EXT_METHOD * method,STACK_OF (SCT)* sct_list,BIO * out,int indent)292 static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
293 BIO *out, int indent)
294 {
295 SCT *sct;
296 int i;
297
298 for (i = 0; i < sk_SCT_num(sct_list);) {
299 sct = sk_SCT_value(sct_list, i);
300
301 BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
302 BIO_printf(out, "\n%*sVersion : ", indent + 4, "");
303
304 if (sct->version == 0) { /* SCT v1 */
305 BIO_printf(out, "v1(0)");
306
307 BIO_printf(out, "\n%*sLog ID : ", indent + 4, "");
308 BIO_hex_string(out, indent + 16, 16, sct->logid, sct->logidlen);
309
310 BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
311 timestamp_print(out, sct->timestamp);
312
313 BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
314 if (sct->extlen == 0)
315 BIO_printf(out, "none");
316 else
317 BIO_hex_string(out, indent + 16, 16, sct->ext, sct->extlen);
318
319 BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
320 tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
321 BIO_printf(out, "\n%*s ", indent + 4, "");
322 BIO_hex_string(out, indent + 16, 16, sct->sig, sct->siglen);
323 } else { /* Unknown version */
324
325 BIO_printf(out, "unknown\n%*s", indent + 16, "");
326 BIO_hex_string(out, indent + 16, 16, sct->sct, sct->sctlen);
327 }
328
329 if (++i < sk_SCT_num(sct_list))
330 BIO_printf(out, "\n");
331 }
332
333 return 1;
334 }
335