Line data Source code
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 :
135 0 : 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 0 : if (hash_alg == TLSEXT_hash_sha256) {
141 0 : if (sig_alg == TLSEXT_signature_rsa)
142 : nid = NID_sha256WithRSAEncryption;
143 0 : else if (sig_alg == TLSEXT_signature_ecdsa)
144 : nid = NID_ecdsa_with_SHA256;
145 : }
146 0 : if (nid == NID_undef)
147 0 : BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
148 : else
149 0 : BIO_printf(out, "%s", OBJ_nid2ln(nid));
150 0 : }
151 :
152 0 : static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
153 : {
154 : ASN1_GENERALIZEDTIME *gen;
155 : char genstr[20];
156 0 : gen = ASN1_GENERALIZEDTIME_new();
157 0 : ASN1_GENERALIZEDTIME_adj(gen, (time_t)0,
158 0 : (int)(timestamp / 86400000),
159 0 : (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 0 : BIO_snprintf(genstr, sizeof(genstr), "%.14s.%03dZ",
165 0 : ASN1_STRING_data(gen), (unsigned int)(timestamp % 1000));
166 0 : ASN1_GENERALIZEDTIME_set_string(gen, genstr);
167 0 : ASN1_GENERALIZEDTIME_print(out, gen);
168 0 : ASN1_GENERALIZEDTIME_free(gen);
169 0 : }
170 :
171 0 : static void SCT_free(SCT *sct)
172 : {
173 0 : if (sct) {
174 0 : if (sct->sct)
175 0 : OPENSSL_free(sct->sct);
176 0 : OPENSSL_free(sct);
177 : }
178 0 : }
179 :
180 0 : static void SCT_LIST_free(STACK_OF(SCT) *a)
181 : {
182 0 : sk_SCT_pop_free(a, SCT_free);
183 0 : }
184 :
185 0 : static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a,
186 : const unsigned char **pp, long length)
187 : {
188 0 : 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 :
194 0 : if (d2i_ASN1_OCTET_STRING(&oct, pp, length) == NULL)
195 : return NULL;
196 0 : if (oct->length < 2)
197 : goto done;
198 0 : p = oct->data;
199 0 : n2s(p, listlen);
200 0 : if (listlen != oct->length - 2)
201 : goto done;
202 :
203 0 : if ((sk = sk_SCT_new_null()) == NULL)
204 : goto done;
205 :
206 0 : while (listlen > 0) {
207 0 : if (listlen < 2)
208 : goto err;
209 0 : n2s(p, sctlen);
210 0 : listlen -= 2;
211 :
212 0 : if ((sctlen < 1) || (sctlen > listlen))
213 : goto err;
214 0 : listlen -= sctlen;
215 :
216 0 : sct = OPENSSL_malloc(sizeof(SCT));
217 0 : if (!sct)
218 : goto err;
219 0 : if (!sk_SCT_push(sk, sct)) {
220 0 : OPENSSL_free(sct);
221 0 : goto err;
222 : }
223 :
224 0 : sct->sct = OPENSSL_malloc(sctlen);
225 0 : if (!sct->sct)
226 : goto err;
227 0 : memcpy(sct->sct, p, sctlen);
228 0 : sct->sctlen = sctlen;
229 0 : p += sctlen;
230 0 : p2 = sct->sct;
231 :
232 0 : sct->version = *p2++;
233 0 : if (sct->version == 0) { /* SCT v1 */
234 : /*-
235 : * Fixed-length header:
236 : * struct {
237 : * (1 byte) Version sct_version;
238 : * (32 bytes) LogID id;
239 : * (8 bytes) uint64 timestamp;
240 : * (2 bytes + ?) CtExtensions extensions;
241 : */
242 0 : if (sctlen < 43)
243 : goto err;
244 0 : sctlen -= 43;
245 :
246 0 : sct->logid = p2;
247 0 : sct->logidlen = 32;
248 : p2 += 32;
249 :
250 0 : n2l8(p2, sct->timestamp);
251 :
252 0 : n2s(p2, fieldlen);
253 0 : if (sctlen < fieldlen)
254 : goto err;
255 0 : sct->ext = p2;
256 0 : sct->extlen = fieldlen;
257 0 : p2 += fieldlen;
258 0 : sctlen -= fieldlen;
259 :
260 : /*-
261 : * digitally-signed struct header:
262 : * (1 byte) Hash algorithm
263 : * (1 byte) Signature algorithm
264 : * (2 bytes + ?) Signature
265 : */
266 0 : if (sctlen < 4)
267 : goto err;
268 0 : sctlen -= 4;
269 :
270 0 : sct->hash_alg = *p2++;
271 0 : sct->sig_alg = *p2++;
272 0 : n2s(p2, fieldlen);
273 0 : if (sctlen != fieldlen)
274 : goto err;
275 0 : sct->sig = p2;
276 0 : sct->siglen = fieldlen;
277 : }
278 : }
279 :
280 : done:
281 0 : ASN1_OCTET_STRING_free(oct);
282 0 : return sk;
283 :
284 : err:
285 : SCT_LIST_free(sk);
286 : sk = NULL;
287 0 : goto done;
288 : }
289 :
290 0 : static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
291 : BIO *out, int indent)
292 : {
293 : SCT *sct;
294 : int i;
295 :
296 0 : for (i = 0; i < sk_SCT_num(sct_list);) {
297 0 : sct = sk_SCT_value(sct_list, i);
298 :
299 0 : BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
300 0 : BIO_printf(out, "\n%*sVersion : ", indent + 4, "");
301 :
302 0 : if (sct->version == 0) { /* SCT v1 */
303 0 : BIO_printf(out, "v1(0)");
304 :
305 0 : BIO_printf(out, "\n%*sLog ID : ", indent + 4, "");
306 0 : BIO_hex_string(out, indent + 16, 16, sct->logid, sct->logidlen);
307 :
308 0 : BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
309 0 : timestamp_print(out, sct->timestamp);
310 :
311 0 : BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
312 0 : if (sct->extlen == 0)
313 0 : BIO_printf(out, "none");
314 : else
315 0 : BIO_hex_string(out, indent + 16, 16, sct->ext, sct->extlen);
316 :
317 0 : BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
318 0 : tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
319 0 : BIO_printf(out, "\n%*s ", indent + 4, "");
320 0 : BIO_hex_string(out, indent + 16, 16, sct->sig, sct->siglen);
321 : } else { /* Unknown version */
322 :
323 0 : BIO_printf(out, "unknown\n%*s", indent + 16, "");
324 0 : BIO_hex_string(out, indent + 16, 16, sct->sct, sct->sctlen);
325 : }
326 :
327 0 : if (++i < sk_SCT_num(sct_list))
328 0 : BIO_printf(out, "\n");
329 : }
330 :
331 0 : return 1;
332 : }
|
