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3149baf8 | 1 | /* |
0cea8832 RP |
2 | * Written by Rob Stradling (rob@comodo.com), Stephen Henson (steve@openssl.org) |
3 | * and Adam Eijdenberg (adam.eijdenberg@gmail.com) for the OpenSSL project 2016. | |
3149baf8 AE |
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 | ||
0cea8832 RP |
59 | #ifdef OPENSSL_NO_CT |
60 | # error "CT disabled" | |
61 | #endif | |
62 | ||
63 | #include <openssl/ct.h> | |
64 | #include <openssl/err.h> | |
65 | #include <openssl/evp.h> | |
66 | #include <openssl/tls1.h> | |
67 | #include <openssl/x509.h> | |
3149baf8 | 68 | |
0cea8832 | 69 | #include "ct_locl.h" |
3149baf8 AE |
70 | |
71 | SCT *SCT_new(void) | |
72 | { | |
0dfd6cf9 | 73 | SCT *sct = OPENSSL_zalloc(sizeof(*sct)); |
0cea8832 | 74 | |
3149baf8 AE |
75 | if (sct == NULL) { |
76 | CTerr(CT_F_SCT_NEW, ERR_R_MALLOC_FAILURE); | |
77 | return NULL; | |
78 | } | |
0cea8832 RP |
79 | |
80 | sct->entry_type = CT_LOG_ENTRY_TYPE_NOT_SET; | |
81 | sct->version = SCT_VERSION_NOT_SET; | |
3149baf8 AE |
82 | return sct; |
83 | } | |
84 | ||
85 | void SCT_free(SCT *sct) | |
86 | { | |
0cea8832 RP |
87 | if (sct == NULL) |
88 | return; | |
89 | ||
90 | OPENSSL_free(sct->log_id); | |
91 | OPENSSL_free(sct->ext); | |
92 | OPENSSL_free(sct->sig); | |
93 | OPENSSL_free(sct->sct); | |
94 | OPENSSL_free(sct); | |
3149baf8 AE |
95 | } |
96 | ||
97 | int SCT_set_version(SCT *sct, sct_version_t version) | |
98 | { | |
0cea8832 | 99 | if (version != SCT_VERSION_V1) { |
3149baf8 AE |
100 | CTerr(CT_F_SCT_SET_VERSION, CT_R_UNSUPPORTED_VERSION); |
101 | return 0; | |
102 | } | |
103 | sct->version = version; | |
6d7fd9c1 | 104 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
105 | return 1; |
106 | } | |
107 | ||
0cea8832 | 108 | int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type) |
3149baf8 | 109 | { |
6d7fd9c1 RP |
110 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
111 | ||
0cea8832 RP |
112 | switch (entry_type) { |
113 | case CT_LOG_ENTRY_TYPE_X509: | |
114 | case CT_LOG_ENTRY_TYPE_PRECERT: | |
115 | sct->entry_type = entry_type; | |
116 | return 1; | |
117 | default: | |
3149baf8 AE |
118 | CTerr(CT_F_SCT_SET_LOG_ENTRY_TYPE, CT_R_UNSUPPORTED_ENTRY_TYPE); |
119 | return 0; | |
120 | } | |
3149baf8 AE |
121 | } |
122 | ||
123 | int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len) | |
124 | { | |
0cea8832 | 125 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
3149baf8 AE |
126 | CTerr(CT_F_SCT_SET0_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
127 | return 0; | |
128 | } | |
0cea8832 | 129 | |
3149baf8 AE |
130 | OPENSSL_free(sct->log_id); |
131 | sct->log_id = log_id; | |
132 | sct->log_id_len = log_id_len; | |
6d7fd9c1 | 133 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
134 | return 1; |
135 | } | |
136 | ||
5ad29c54 AE |
137 | int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len) |
138 | { | |
0cea8832 | 139 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
5ad29c54 AE |
140 | CTerr(CT_F_SCT_SET1_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
141 | return 0; | |
142 | } | |
143 | ||
144 | OPENSSL_free(sct->log_id); | |
0cea8832 RP |
145 | sct->log_id = NULL; |
146 | sct->log_id_len = 0; | |
6d7fd9c1 | 147 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 | 148 | |
0cea8832 RP |
149 | if (log_id != NULL && log_id_len > 0) { |
150 | sct->log_id = OPENSSL_memdup(log_id, log_id_len); | |
5ad29c54 AE |
151 | if (sct->log_id == NULL) { |
152 | CTerr(CT_F_SCT_SET1_LOG_ID, ERR_R_MALLOC_FAILURE); | |
153 | return 0; | |
154 | } | |
0cea8832 | 155 | sct->log_id_len = log_id_len; |
5ad29c54 | 156 | } |
5ad29c54 AE |
157 | return 1; |
158 | } | |
159 | ||
160 | ||
3149baf8 AE |
161 | void SCT_set_timestamp(SCT *sct, uint64_t timestamp) |
162 | { | |
163 | sct->timestamp = timestamp; | |
6d7fd9c1 | 164 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
165 | } |
166 | ||
167 | int SCT_set_signature_nid(SCT *sct, int nid) | |
168 | { | |
169 | switch (nid) { | |
170 | case NID_sha256WithRSAEncryption: | |
171 | sct->hash_alg = TLSEXT_hash_sha256; | |
172 | sct->sig_alg = TLSEXT_signature_rsa; | |
6d7fd9c1 | 173 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
174 | return 1; |
175 | case NID_ecdsa_with_SHA256: | |
176 | sct->hash_alg = TLSEXT_hash_sha256; | |
177 | sct->sig_alg = TLSEXT_signature_ecdsa; | |
6d7fd9c1 | 178 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
179 | return 1; |
180 | default: | |
181 | CTerr(CT_F_SCT_SET_SIGNATURE_NID, CT_R_UNRECOGNIZED_SIGNATURE_NID); | |
182 | return 0; | |
183 | } | |
184 | } | |
185 | ||
186 | void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len) | |
187 | { | |
188 | OPENSSL_free(sct->ext); | |
189 | sct->ext = ext; | |
190 | sct->ext_len = ext_len; | |
6d7fd9c1 | 191 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
192 | } |
193 | ||
5ad29c54 AE |
194 | int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len) |
195 | { | |
196 | OPENSSL_free(sct->ext); | |
197 | sct->ext = NULL; | |
198 | sct->ext_len = 0; | |
6d7fd9c1 | 199 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 AE |
200 | |
201 | if (ext != NULL && ext_len > 0) { | |
202 | sct->ext = OPENSSL_memdup(ext, ext_len); | |
203 | if (sct->ext == NULL) { | |
204 | CTerr(CT_F_SCT_SET1_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
205 | return 0; | |
206 | } | |
207 | sct->ext_len = ext_len; | |
208 | } | |
209 | return 1; | |
210 | } | |
211 | ||
3149baf8 AE |
212 | void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len) |
213 | { | |
214 | OPENSSL_free(sct->sig); | |
215 | sct->sig = sig; | |
216 | sct->sig_len = sig_len; | |
6d7fd9c1 | 217 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
218 | } |
219 | ||
5ad29c54 AE |
220 | int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len) |
221 | { | |
222 | OPENSSL_free(sct->sig); | |
0cea8832 RP |
223 | sct->sig = NULL; |
224 | sct->sig_len = 0; | |
6d7fd9c1 | 225 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
0cea8832 RP |
226 | |
227 | if (sig != NULL && sig_len > 0) { | |
5ad29c54 AE |
228 | sct->sig = OPENSSL_memdup(sig, sig_len); |
229 | if (sct->sig == NULL) { | |
230 | CTerr(CT_F_SCT_SET1_SIGNATURE, ERR_R_MALLOC_FAILURE); | |
231 | return 0; | |
232 | } | |
0cea8832 | 233 | sct->sig_len = sig_len; |
5ad29c54 | 234 | } |
5ad29c54 AE |
235 | return 1; |
236 | } | |
237 | ||
3149baf8 AE |
238 | sct_version_t SCT_get_version(const SCT *sct) |
239 | { | |
240 | return sct->version; | |
241 | } | |
242 | ||
0cea8832 | 243 | ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct) |
3149baf8 AE |
244 | { |
245 | return sct->entry_type; | |
246 | } | |
247 | ||
248 | size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id) | |
249 | { | |
250 | *log_id = sct->log_id; | |
251 | return sct->log_id_len; | |
252 | } | |
253 | ||
254 | uint64_t SCT_get_timestamp(const SCT *sct) | |
255 | { | |
256 | return sct->timestamp; | |
257 | } | |
258 | ||
259 | int SCT_get_signature_nid(const SCT *sct) | |
260 | { | |
0cea8832 | 261 | if (sct->version == SCT_VERSION_V1) { |
3149baf8 AE |
262 | if (sct->hash_alg == TLSEXT_hash_sha256) { |
263 | switch (sct->sig_alg) { | |
264 | case TLSEXT_signature_ecdsa: | |
265 | return NID_ecdsa_with_SHA256; | |
266 | case TLSEXT_signature_rsa: | |
267 | return NID_sha256WithRSAEncryption; | |
268 | default: | |
269 | return NID_undef; | |
270 | } | |
271 | } | |
272 | } | |
273 | return NID_undef; | |
274 | } | |
275 | ||
276 | size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext) | |
277 | { | |
278 | *ext = sct->ext; | |
279 | return sct->ext_len; | |
280 | } | |
281 | ||
282 | size_t SCT_get0_signature(const SCT *sct, unsigned char **sig) | |
283 | { | |
284 | *sig = sct->sig; | |
285 | return sct->sig_len; | |
286 | } | |
287 | ||
0cea8832 | 288 | int SCT_is_complete(const SCT *sct) |
5ad29c54 AE |
289 | { |
290 | switch (sct->version) { | |
0cea8832 | 291 | case SCT_VERSION_NOT_SET: |
5ad29c54 | 292 | return 0; |
0cea8832 RP |
293 | case SCT_VERSION_V1: |
294 | return sct->log_id != NULL && SCT_signature_is_complete(sct); | |
5ad29c54 AE |
295 | default: |
296 | return sct->sct != NULL; /* Just need cached encoding */ | |
297 | } | |
298 | } | |
299 | ||
0cea8832 RP |
300 | int SCT_signature_is_complete(const SCT *sct) |
301 | { | |
302 | return SCT_get_signature_nid(sct) != NID_undef && | |
303 | sct->sig != NULL && sct->sig_len > 0; | |
304 | } | |
305 | ||
8c6afbc5 RP |
306 | sct_source_t SCT_get_source(const SCT *sct) |
307 | { | |
308 | return sct->source; | |
309 | } | |
310 | ||
311 | int SCT_set_source(SCT *sct, sct_source_t source) | |
312 | { | |
313 | sct->source = source; | |
314 | switch (source) { | |
315 | case SCT_SOURCE_TLS_EXTENSION: | |
316 | case SCT_SOURCE_OCSP_STAPLED_RESPONSE: | |
317 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509); | |
318 | case SCT_SOURCE_X509V3_EXTENSION: | |
319 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT); | |
320 | default: /* if we aren't sure, leave the log entry type alone */ | |
321 | return 1; | |
322 | } | |
323 | } | |
324 | ||
7d054e5a RP |
325 | sct_validation_status_t SCT_get_validation_status(const SCT *sct) |
326 | { | |
327 | return sct->validation_status; | |
328 | } | |
329 | ||
330 | int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx) | |
331 | { | |
332 | int is_sct_valid = -1; | |
333 | SCT_CTX *sctx = NULL; | |
334 | X509_PUBKEY *pub = NULL, *log_pkey = NULL; | |
8359b57f | 335 | const CTLOG *log; |
7d054e5a | 336 | |
43341433 VD |
337 | /* |
338 | * With an unrecognized SCT version we don't know what such an SCT means, | |
339 | * let alone validate one. So we return validation failure (0). | |
340 | */ | |
8359b57f | 341 | if (sct->version != SCT_VERSION_V1) { |
7d054e5a | 342 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION; |
43341433 | 343 | return 0; |
7d054e5a RP |
344 | } |
345 | ||
8359b57f RP |
346 | log = CTLOG_STORE_get0_log_by_id(ctx->log_store, |
347 | sct->log_id, sct->log_id_len); | |
348 | ||
43341433 | 349 | /* Similarly, an SCT from an unknown log also cannot be validated. */ |
8359b57f | 350 | if (log == NULL) { |
7d054e5a | 351 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG; |
43341433 | 352 | return 0; |
7d054e5a RP |
353 | } |
354 | ||
355 | sctx = SCT_CTX_new(); | |
356 | if (sctx == NULL) | |
357 | goto err; | |
358 | ||
8359b57f | 359 | if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1) |
7d054e5a RP |
360 | goto err; |
361 | if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1) | |
362 | goto err; | |
363 | ||
364 | if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) { | |
365 | EVP_PKEY *issuer_pkey; | |
366 | ||
367 | if (ctx->issuer == NULL) { | |
368 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; | |
369 | goto end; | |
370 | } | |
371 | ||
147e54a7 | 372 | issuer_pkey = X509_get0_pubkey(ctx->issuer); |
7d054e5a RP |
373 | |
374 | if (X509_PUBKEY_set(&pub, issuer_pkey) != 1) | |
375 | goto err; | |
376 | if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1) | |
377 | goto err; | |
378 | } | |
379 | ||
43341433 VD |
380 | /* |
381 | * XXX: Potential for optimization. This repeats some idempotent heavy | |
382 | * lifting on the certificate for each candidate SCT, and appears to not | |
383 | * use any information in the SCT itself, only the certificate is | |
384 | * processed. So it may make more sense to to do this just once, perhaps | |
385 | * associated with the shared (by all SCTs) policy eval ctx. | |
386 | * | |
387 | * XXX: Failure here is global (SCT independent) and represents either an | |
388 | * issue with the certificate (e.g. duplicate extensions) or an out of | |
389 | * memory condition. When the certificate is incompatible with CT, we just | |
390 | * mark the SCTs invalid, rather than report a failure to determine the | |
391 | * validation status. That way, callbacks that want to do "soft" SCT | |
392 | * processing will not abort handshakes with false positive internal | |
393 | * errors. Since the function does not distinguish between certificate | |
394 | * issues (peer's fault) and internal problems (out fault) the safe thing | |
395 | * to do is to report a validation failure and let the callback or | |
396 | * application decide what to do. | |
397 | */ | |
7d054e5a | 398 | if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1) |
43341433 VD |
399 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; |
400 | else | |
401 | sct->validation_status = SCT_verify(sctx, sct) == 1 ? | |
7d054e5a RP |
402 | SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID; |
403 | ||
404 | end: | |
405 | is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID; | |
406 | err: | |
407 | X509_PUBKEY_free(pub); | |
408 | X509_PUBKEY_free(log_pkey); | |
409 | SCT_CTX_free(sctx); | |
410 | ||
411 | return is_sct_valid; | |
412 | } | |
413 | ||
414 | int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx) | |
415 | { | |
416 | int are_scts_valid = 1; | |
417 | int sct_count = scts != NULL ? sk_SCT_num(scts) : 0; | |
418 | int i; | |
419 | ||
420 | for (i = 0; i < sct_count; ++i) { | |
421 | int is_sct_valid = -1; | |
422 | SCT *sct = sk_SCT_value(scts, i); | |
423 | ||
424 | if (sct == NULL) | |
425 | continue; | |
426 | ||
427 | is_sct_valid = SCT_validate(sct, ctx); | |
428 | if (is_sct_valid < 0) | |
429 | return is_sct_valid; | |
430 | are_scts_valid &= is_sct_valid; | |
431 | } | |
432 | ||
433 | return are_scts_valid; | |
434 | } |