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3149baf8 | 1 | /* |
8020d79b | 2 | * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved. |
3149baf8 | 3 | * |
5477e842 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
3149baf8 AE |
8 | */ |
9 | ||
0cea8832 RP |
10 | #ifdef OPENSSL_NO_CT |
11 | # error "CT disabled" | |
12 | #endif | |
13 | ||
14 | #include <openssl/ct.h> | |
15 | #include <openssl/err.h> | |
16 | #include <openssl/evp.h> | |
17 | #include <openssl/tls1.h> | |
18 | #include <openssl/x509.h> | |
3149baf8 | 19 | |
706457b7 | 20 | #include "ct_local.h" |
3149baf8 AE |
21 | |
22 | SCT *SCT_new(void) | |
23 | { | |
0dfd6cf9 | 24 | SCT *sct = OPENSSL_zalloc(sizeof(*sct)); |
0cea8832 | 25 | |
e077455e | 26 | if (sct == NULL) |
3149baf8 | 27 | return NULL; |
0cea8832 RP |
28 | |
29 | sct->entry_type = CT_LOG_ENTRY_TYPE_NOT_SET; | |
30 | sct->version = SCT_VERSION_NOT_SET; | |
3149baf8 AE |
31 | return sct; |
32 | } | |
33 | ||
34 | void SCT_free(SCT *sct) | |
35 | { | |
0cea8832 RP |
36 | if (sct == NULL) |
37 | return; | |
38 | ||
39 | OPENSSL_free(sct->log_id); | |
40 | OPENSSL_free(sct->ext); | |
41 | OPENSSL_free(sct->sig); | |
42 | OPENSSL_free(sct->sct); | |
43 | OPENSSL_free(sct); | |
3149baf8 AE |
44 | } |
45 | ||
e1940e9f RP |
46 | void SCT_LIST_free(STACK_OF(SCT) *a) |
47 | { | |
48 | sk_SCT_pop_free(a, SCT_free); | |
49 | } | |
50 | ||
3149baf8 AE |
51 | int SCT_set_version(SCT *sct, sct_version_t version) |
52 | { | |
0cea8832 | 53 | if (version != SCT_VERSION_V1) { |
9311d0c4 | 54 | ERR_raise(ERR_LIB_CT, CT_R_UNSUPPORTED_VERSION); |
3149baf8 AE |
55 | return 0; |
56 | } | |
57 | sct->version = version; | |
6d7fd9c1 | 58 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
59 | return 1; |
60 | } | |
61 | ||
0cea8832 | 62 | int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type) |
3149baf8 | 63 | { |
6d7fd9c1 RP |
64 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
65 | ||
0cea8832 RP |
66 | switch (entry_type) { |
67 | case CT_LOG_ENTRY_TYPE_X509: | |
68 | case CT_LOG_ENTRY_TYPE_PRECERT: | |
69 | sct->entry_type = entry_type; | |
70 | return 1; | |
f3b3d7f0 RS |
71 | case CT_LOG_ENTRY_TYPE_NOT_SET: |
72 | break; | |
3149baf8 | 73 | } |
9311d0c4 | 74 | ERR_raise(ERR_LIB_CT, CT_R_UNSUPPORTED_ENTRY_TYPE); |
f3b3d7f0 | 75 | return 0; |
3149baf8 AE |
76 | } |
77 | ||
78 | int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len) | |
79 | { | |
0cea8832 | 80 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
9311d0c4 | 81 | ERR_raise(ERR_LIB_CT, CT_R_INVALID_LOG_ID_LENGTH); |
3149baf8 AE |
82 | return 0; |
83 | } | |
0cea8832 | 84 | |
3149baf8 AE |
85 | OPENSSL_free(sct->log_id); |
86 | sct->log_id = log_id; | |
87 | sct->log_id_len = log_id_len; | |
6d7fd9c1 | 88 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
89 | return 1; |
90 | } | |
91 | ||
5ad29c54 AE |
92 | int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len) |
93 | { | |
0cea8832 | 94 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
9311d0c4 | 95 | ERR_raise(ERR_LIB_CT, CT_R_INVALID_LOG_ID_LENGTH); |
5ad29c54 AE |
96 | return 0; |
97 | } | |
98 | ||
99 | OPENSSL_free(sct->log_id); | |
0cea8832 RP |
100 | sct->log_id = NULL; |
101 | sct->log_id_len = 0; | |
6d7fd9c1 | 102 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 | 103 | |
0cea8832 RP |
104 | if (log_id != NULL && log_id_len > 0) { |
105 | sct->log_id = OPENSSL_memdup(log_id, log_id_len); | |
e077455e | 106 | if (sct->log_id == NULL) |
5ad29c54 | 107 | return 0; |
0cea8832 | 108 | sct->log_id_len = log_id_len; |
5ad29c54 | 109 | } |
5ad29c54 AE |
110 | return 1; |
111 | } | |
112 | ||
113 | ||
3149baf8 AE |
114 | void SCT_set_timestamp(SCT *sct, uint64_t timestamp) |
115 | { | |
116 | sct->timestamp = timestamp; | |
6d7fd9c1 | 117 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
118 | } |
119 | ||
120 | int SCT_set_signature_nid(SCT *sct, int nid) | |
121 | { | |
700b8145 | 122 | switch (nid) { |
3149baf8 AE |
123 | case NID_sha256WithRSAEncryption: |
124 | sct->hash_alg = TLSEXT_hash_sha256; | |
125 | sct->sig_alg = TLSEXT_signature_rsa; | |
6d7fd9c1 | 126 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
127 | return 1; |
128 | case NID_ecdsa_with_SHA256: | |
129 | sct->hash_alg = TLSEXT_hash_sha256; | |
130 | sct->sig_alg = TLSEXT_signature_ecdsa; | |
6d7fd9c1 | 131 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
132 | return 1; |
133 | default: | |
9311d0c4 | 134 | ERR_raise(ERR_LIB_CT, CT_R_UNRECOGNIZED_SIGNATURE_NID); |
3149baf8 AE |
135 | return 0; |
136 | } | |
137 | } | |
138 | ||
139 | void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len) | |
140 | { | |
141 | OPENSSL_free(sct->ext); | |
142 | sct->ext = ext; | |
143 | sct->ext_len = ext_len; | |
6d7fd9c1 | 144 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
145 | } |
146 | ||
5ad29c54 AE |
147 | int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len) |
148 | { | |
149 | OPENSSL_free(sct->ext); | |
150 | sct->ext = NULL; | |
151 | sct->ext_len = 0; | |
6d7fd9c1 | 152 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 AE |
153 | |
154 | if (ext != NULL && ext_len > 0) { | |
155 | sct->ext = OPENSSL_memdup(ext, ext_len); | |
e077455e | 156 | if (sct->ext == NULL) |
5ad29c54 | 157 | return 0; |
5ad29c54 AE |
158 | sct->ext_len = ext_len; |
159 | } | |
160 | return 1; | |
161 | } | |
162 | ||
3149baf8 AE |
163 | void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len) |
164 | { | |
165 | OPENSSL_free(sct->sig); | |
166 | sct->sig = sig; | |
167 | sct->sig_len = sig_len; | |
6d7fd9c1 | 168 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
169 | } |
170 | ||
5ad29c54 AE |
171 | int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len) |
172 | { | |
173 | OPENSSL_free(sct->sig); | |
0cea8832 RP |
174 | sct->sig = NULL; |
175 | sct->sig_len = 0; | |
6d7fd9c1 | 176 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
0cea8832 RP |
177 | |
178 | if (sig != NULL && sig_len > 0) { | |
5ad29c54 | 179 | sct->sig = OPENSSL_memdup(sig, sig_len); |
e077455e | 180 | if (sct->sig == NULL) |
5ad29c54 | 181 | return 0; |
0cea8832 | 182 | sct->sig_len = sig_len; |
5ad29c54 | 183 | } |
5ad29c54 AE |
184 | return 1; |
185 | } | |
186 | ||
3149baf8 AE |
187 | sct_version_t SCT_get_version(const SCT *sct) |
188 | { | |
189 | return sct->version; | |
190 | } | |
191 | ||
0cea8832 | 192 | ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct) |
3149baf8 AE |
193 | { |
194 | return sct->entry_type; | |
195 | } | |
196 | ||
197 | size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id) | |
198 | { | |
199 | *log_id = sct->log_id; | |
200 | return sct->log_id_len; | |
201 | } | |
202 | ||
203 | uint64_t SCT_get_timestamp(const SCT *sct) | |
204 | { | |
205 | return sct->timestamp; | |
206 | } | |
207 | ||
208 | int SCT_get_signature_nid(const SCT *sct) | |
209 | { | |
0cea8832 | 210 | if (sct->version == SCT_VERSION_V1) { |
3149baf8 AE |
211 | if (sct->hash_alg == TLSEXT_hash_sha256) { |
212 | switch (sct->sig_alg) { | |
213 | case TLSEXT_signature_ecdsa: | |
214 | return NID_ecdsa_with_SHA256; | |
215 | case TLSEXT_signature_rsa: | |
216 | return NID_sha256WithRSAEncryption; | |
217 | default: | |
218 | return NID_undef; | |
219 | } | |
220 | } | |
221 | } | |
222 | return NID_undef; | |
223 | } | |
224 | ||
225 | size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext) | |
226 | { | |
227 | *ext = sct->ext; | |
228 | return sct->ext_len; | |
229 | } | |
230 | ||
231 | size_t SCT_get0_signature(const SCT *sct, unsigned char **sig) | |
232 | { | |
233 | *sig = sct->sig; | |
234 | return sct->sig_len; | |
235 | } | |
236 | ||
0cea8832 | 237 | int SCT_is_complete(const SCT *sct) |
5ad29c54 AE |
238 | { |
239 | switch (sct->version) { | |
0cea8832 | 240 | case SCT_VERSION_NOT_SET: |
5ad29c54 | 241 | return 0; |
0cea8832 RP |
242 | case SCT_VERSION_V1: |
243 | return sct->log_id != NULL && SCT_signature_is_complete(sct); | |
5ad29c54 AE |
244 | default: |
245 | return sct->sct != NULL; /* Just need cached encoding */ | |
246 | } | |
247 | } | |
248 | ||
0cea8832 RP |
249 | int SCT_signature_is_complete(const SCT *sct) |
250 | { | |
251 | return SCT_get_signature_nid(sct) != NID_undef && | |
252 | sct->sig != NULL && sct->sig_len > 0; | |
253 | } | |
254 | ||
8c6afbc5 RP |
255 | sct_source_t SCT_get_source(const SCT *sct) |
256 | { | |
257 | return sct->source; | |
258 | } | |
259 | ||
260 | int SCT_set_source(SCT *sct, sct_source_t source) | |
261 | { | |
262 | sct->source = source; | |
fa515410 | 263 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
8c6afbc5 RP |
264 | switch (source) { |
265 | case SCT_SOURCE_TLS_EXTENSION: | |
266 | case SCT_SOURCE_OCSP_STAPLED_RESPONSE: | |
267 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509); | |
268 | case SCT_SOURCE_X509V3_EXTENSION: | |
269 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT); | |
f3b3d7f0 RS |
270 | case SCT_SOURCE_UNKNOWN: |
271 | break; | |
8c6afbc5 | 272 | } |
f3b3d7f0 RS |
273 | /* if we aren't sure, leave the log entry type alone */ |
274 | return 1; | |
8c6afbc5 RP |
275 | } |
276 | ||
7d054e5a RP |
277 | sct_validation_status_t SCT_get_validation_status(const SCT *sct) |
278 | { | |
279 | return sct->validation_status; | |
280 | } | |
281 | ||
282 | int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx) | |
283 | { | |
284 | int is_sct_valid = -1; | |
285 | SCT_CTX *sctx = NULL; | |
286 | X509_PUBKEY *pub = NULL, *log_pkey = NULL; | |
8359b57f | 287 | const CTLOG *log; |
7d054e5a | 288 | |
43341433 VD |
289 | /* |
290 | * With an unrecognized SCT version we don't know what such an SCT means, | |
291 | * let alone validate one. So we return validation failure (0). | |
292 | */ | |
8359b57f | 293 | if (sct->version != SCT_VERSION_V1) { |
7d054e5a | 294 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION; |
43341433 | 295 | return 0; |
7d054e5a RP |
296 | } |
297 | ||
8359b57f RP |
298 | log = CTLOG_STORE_get0_log_by_id(ctx->log_store, |
299 | sct->log_id, sct->log_id_len); | |
300 | ||
43341433 | 301 | /* Similarly, an SCT from an unknown log also cannot be validated. */ |
8359b57f | 302 | if (log == NULL) { |
7d054e5a | 303 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG; |
43341433 | 304 | return 0; |
7d054e5a RP |
305 | } |
306 | ||
d4b2bfba | 307 | sctx = SCT_CTX_new(ctx->libctx, ctx->propq); |
7d054e5a RP |
308 | if (sctx == NULL) |
309 | goto err; | |
310 | ||
8359b57f | 311 | if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1) |
7d054e5a RP |
312 | goto err; |
313 | if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1) | |
314 | goto err; | |
315 | ||
316 | if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) { | |
317 | EVP_PKEY *issuer_pkey; | |
318 | ||
319 | if (ctx->issuer == NULL) { | |
320 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; | |
321 | goto end; | |
322 | } | |
323 | ||
147e54a7 | 324 | issuer_pkey = X509_get0_pubkey(ctx->issuer); |
7d054e5a RP |
325 | |
326 | if (X509_PUBKEY_set(&pub, issuer_pkey) != 1) | |
327 | goto err; | |
328 | if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1) | |
329 | goto err; | |
330 | } | |
331 | ||
1fa9ffd9 RP |
332 | SCT_CTX_set_time(sctx, ctx->epoch_time_in_ms); |
333 | ||
43341433 VD |
334 | /* |
335 | * XXX: Potential for optimization. This repeats some idempotent heavy | |
336 | * lifting on the certificate for each candidate SCT, and appears to not | |
337 | * use any information in the SCT itself, only the certificate is | |
3e6a0d57 | 338 | * processed. So it may make more sense to do this just once, perhaps |
43341433 VD |
339 | * associated with the shared (by all SCTs) policy eval ctx. |
340 | * | |
341 | * XXX: Failure here is global (SCT independent) and represents either an | |
342 | * issue with the certificate (e.g. duplicate extensions) or an out of | |
343 | * memory condition. When the certificate is incompatible with CT, we just | |
344 | * mark the SCTs invalid, rather than report a failure to determine the | |
345 | * validation status. That way, callbacks that want to do "soft" SCT | |
346 | * processing will not abort handshakes with false positive internal | |
347 | * errors. Since the function does not distinguish between certificate | |
348 | * issues (peer's fault) and internal problems (out fault) the safe thing | |
349 | * to do is to report a validation failure and let the callback or | |
350 | * application decide what to do. | |
351 | */ | |
7d054e5a | 352 | if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1) |
43341433 VD |
353 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; |
354 | else | |
cdb2a603 | 355 | sct->validation_status = SCT_CTX_verify(sctx, sct) == 1 ? |
7d054e5a RP |
356 | SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID; |
357 | ||
358 | end: | |
359 | is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID; | |
360 | err: | |
361 | X509_PUBKEY_free(pub); | |
362 | X509_PUBKEY_free(log_pkey); | |
363 | SCT_CTX_free(sctx); | |
364 | ||
365 | return is_sct_valid; | |
366 | } | |
367 | ||
368 | int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx) | |
369 | { | |
370 | int are_scts_valid = 1; | |
371 | int sct_count = scts != NULL ? sk_SCT_num(scts) : 0; | |
372 | int i; | |
373 | ||
374 | for (i = 0; i < sct_count; ++i) { | |
375 | int is_sct_valid = -1; | |
376 | SCT *sct = sk_SCT_value(scts, i); | |
377 | ||
378 | if (sct == NULL) | |
379 | continue; | |
380 | ||
381 | is_sct_valid = SCT_validate(sct, ctx); | |
382 | if (is_sct_valid < 0) | |
383 | return is_sct_valid; | |
384 | are_scts_valid &= is_sct_valid; | |
385 | } | |
386 | ||
387 | return are_scts_valid; | |
388 | } |