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3149baf8 | 1 | /* |
d2e9e320 | 2 | * Copyright 2016 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 | |
3149baf8 AE |
26 | if (sct == NULL) { |
27 | CTerr(CT_F_SCT_NEW, ERR_R_MALLOC_FAILURE); | |
28 | return NULL; | |
29 | } | |
0cea8832 RP |
30 | |
31 | sct->entry_type = CT_LOG_ENTRY_TYPE_NOT_SET; | |
32 | sct->version = SCT_VERSION_NOT_SET; | |
3149baf8 AE |
33 | return sct; |
34 | } | |
35 | ||
36 | void SCT_free(SCT *sct) | |
37 | { | |
0cea8832 RP |
38 | if (sct == NULL) |
39 | return; | |
40 | ||
41 | OPENSSL_free(sct->log_id); | |
42 | OPENSSL_free(sct->ext); | |
43 | OPENSSL_free(sct->sig); | |
44 | OPENSSL_free(sct->sct); | |
45 | OPENSSL_free(sct); | |
3149baf8 AE |
46 | } |
47 | ||
e1940e9f RP |
48 | void SCT_LIST_free(STACK_OF(SCT) *a) |
49 | { | |
50 | sk_SCT_pop_free(a, SCT_free); | |
51 | } | |
52 | ||
3149baf8 AE |
53 | int SCT_set_version(SCT *sct, sct_version_t version) |
54 | { | |
0cea8832 | 55 | if (version != SCT_VERSION_V1) { |
3149baf8 AE |
56 | CTerr(CT_F_SCT_SET_VERSION, CT_R_UNSUPPORTED_VERSION); |
57 | return 0; | |
58 | } | |
59 | sct->version = version; | |
6d7fd9c1 | 60 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
61 | return 1; |
62 | } | |
63 | ||
0cea8832 | 64 | int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type) |
3149baf8 | 65 | { |
6d7fd9c1 RP |
66 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
67 | ||
0cea8832 RP |
68 | switch (entry_type) { |
69 | case CT_LOG_ENTRY_TYPE_X509: | |
70 | case CT_LOG_ENTRY_TYPE_PRECERT: | |
71 | sct->entry_type = entry_type; | |
72 | return 1; | |
f3b3d7f0 RS |
73 | case CT_LOG_ENTRY_TYPE_NOT_SET: |
74 | break; | |
3149baf8 | 75 | } |
f3b3d7f0 RS |
76 | CTerr(CT_F_SCT_SET_LOG_ENTRY_TYPE, CT_R_UNSUPPORTED_ENTRY_TYPE); |
77 | return 0; | |
3149baf8 AE |
78 | } |
79 | ||
80 | int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len) | |
81 | { | |
0cea8832 | 82 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
3149baf8 AE |
83 | CTerr(CT_F_SCT_SET0_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
84 | return 0; | |
85 | } | |
0cea8832 | 86 | |
3149baf8 AE |
87 | OPENSSL_free(sct->log_id); |
88 | sct->log_id = log_id; | |
89 | sct->log_id_len = log_id_len; | |
6d7fd9c1 | 90 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
91 | return 1; |
92 | } | |
93 | ||
5ad29c54 AE |
94 | int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len) |
95 | { | |
0cea8832 | 96 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
5ad29c54 AE |
97 | CTerr(CT_F_SCT_SET1_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
98 | return 0; | |
99 | } | |
100 | ||
101 | OPENSSL_free(sct->log_id); | |
0cea8832 RP |
102 | sct->log_id = NULL; |
103 | sct->log_id_len = 0; | |
6d7fd9c1 | 104 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 | 105 | |
0cea8832 RP |
106 | if (log_id != NULL && log_id_len > 0) { |
107 | sct->log_id = OPENSSL_memdup(log_id, log_id_len); | |
5ad29c54 AE |
108 | if (sct->log_id == NULL) { |
109 | CTerr(CT_F_SCT_SET1_LOG_ID, ERR_R_MALLOC_FAILURE); | |
110 | return 0; | |
111 | } | |
0cea8832 | 112 | sct->log_id_len = log_id_len; |
5ad29c54 | 113 | } |
5ad29c54 AE |
114 | return 1; |
115 | } | |
116 | ||
117 | ||
3149baf8 AE |
118 | void SCT_set_timestamp(SCT *sct, uint64_t timestamp) |
119 | { | |
120 | sct->timestamp = timestamp; | |
6d7fd9c1 | 121 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
122 | } |
123 | ||
124 | int SCT_set_signature_nid(SCT *sct, int nid) | |
125 | { | |
700b8145 | 126 | switch (nid) { |
3149baf8 AE |
127 | case NID_sha256WithRSAEncryption: |
128 | sct->hash_alg = TLSEXT_hash_sha256; | |
129 | sct->sig_alg = TLSEXT_signature_rsa; | |
6d7fd9c1 | 130 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
131 | return 1; |
132 | case NID_ecdsa_with_SHA256: | |
133 | sct->hash_alg = TLSEXT_hash_sha256; | |
134 | sct->sig_alg = TLSEXT_signature_ecdsa; | |
6d7fd9c1 | 135 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
136 | return 1; |
137 | default: | |
138 | CTerr(CT_F_SCT_SET_SIGNATURE_NID, CT_R_UNRECOGNIZED_SIGNATURE_NID); | |
139 | return 0; | |
140 | } | |
141 | } | |
142 | ||
143 | void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len) | |
144 | { | |
145 | OPENSSL_free(sct->ext); | |
146 | sct->ext = ext; | |
147 | sct->ext_len = ext_len; | |
6d7fd9c1 | 148 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
149 | } |
150 | ||
5ad29c54 AE |
151 | int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len) |
152 | { | |
153 | OPENSSL_free(sct->ext); | |
154 | sct->ext = NULL; | |
155 | sct->ext_len = 0; | |
6d7fd9c1 | 156 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 AE |
157 | |
158 | if (ext != NULL && ext_len > 0) { | |
159 | sct->ext = OPENSSL_memdup(ext, ext_len); | |
160 | if (sct->ext == NULL) { | |
161 | CTerr(CT_F_SCT_SET1_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
162 | return 0; | |
163 | } | |
164 | sct->ext_len = ext_len; | |
165 | } | |
166 | return 1; | |
167 | } | |
168 | ||
3149baf8 AE |
169 | void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len) |
170 | { | |
171 | OPENSSL_free(sct->sig); | |
172 | sct->sig = sig; | |
173 | sct->sig_len = sig_len; | |
6d7fd9c1 | 174 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
175 | } |
176 | ||
5ad29c54 AE |
177 | int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len) |
178 | { | |
179 | OPENSSL_free(sct->sig); | |
0cea8832 RP |
180 | sct->sig = NULL; |
181 | sct->sig_len = 0; | |
6d7fd9c1 | 182 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
0cea8832 RP |
183 | |
184 | if (sig != NULL && sig_len > 0) { | |
5ad29c54 AE |
185 | sct->sig = OPENSSL_memdup(sig, sig_len); |
186 | if (sct->sig == NULL) { | |
187 | CTerr(CT_F_SCT_SET1_SIGNATURE, ERR_R_MALLOC_FAILURE); | |
188 | return 0; | |
189 | } | |
0cea8832 | 190 | sct->sig_len = sig_len; |
5ad29c54 | 191 | } |
5ad29c54 AE |
192 | return 1; |
193 | } | |
194 | ||
3149baf8 AE |
195 | sct_version_t SCT_get_version(const SCT *sct) |
196 | { | |
197 | return sct->version; | |
198 | } | |
199 | ||
0cea8832 | 200 | ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct) |
3149baf8 AE |
201 | { |
202 | return sct->entry_type; | |
203 | } | |
204 | ||
205 | size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id) | |
206 | { | |
207 | *log_id = sct->log_id; | |
208 | return sct->log_id_len; | |
209 | } | |
210 | ||
211 | uint64_t SCT_get_timestamp(const SCT *sct) | |
212 | { | |
213 | return sct->timestamp; | |
214 | } | |
215 | ||
216 | int SCT_get_signature_nid(const SCT *sct) | |
217 | { | |
0cea8832 | 218 | if (sct->version == SCT_VERSION_V1) { |
3149baf8 AE |
219 | if (sct->hash_alg == TLSEXT_hash_sha256) { |
220 | switch (sct->sig_alg) { | |
221 | case TLSEXT_signature_ecdsa: | |
222 | return NID_ecdsa_with_SHA256; | |
223 | case TLSEXT_signature_rsa: | |
224 | return NID_sha256WithRSAEncryption; | |
225 | default: | |
226 | return NID_undef; | |
227 | } | |
228 | } | |
229 | } | |
230 | return NID_undef; | |
231 | } | |
232 | ||
233 | size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext) | |
234 | { | |
235 | *ext = sct->ext; | |
236 | return sct->ext_len; | |
237 | } | |
238 | ||
239 | size_t SCT_get0_signature(const SCT *sct, unsigned char **sig) | |
240 | { | |
241 | *sig = sct->sig; | |
242 | return sct->sig_len; | |
243 | } | |
244 | ||
0cea8832 | 245 | int SCT_is_complete(const SCT *sct) |
5ad29c54 AE |
246 | { |
247 | switch (sct->version) { | |
0cea8832 | 248 | case SCT_VERSION_NOT_SET: |
5ad29c54 | 249 | return 0; |
0cea8832 RP |
250 | case SCT_VERSION_V1: |
251 | return sct->log_id != NULL && SCT_signature_is_complete(sct); | |
5ad29c54 AE |
252 | default: |
253 | return sct->sct != NULL; /* Just need cached encoding */ | |
254 | } | |
255 | } | |
256 | ||
0cea8832 RP |
257 | int SCT_signature_is_complete(const SCT *sct) |
258 | { | |
259 | return SCT_get_signature_nid(sct) != NID_undef && | |
260 | sct->sig != NULL && sct->sig_len > 0; | |
261 | } | |
262 | ||
8c6afbc5 RP |
263 | sct_source_t SCT_get_source(const SCT *sct) |
264 | { | |
265 | return sct->source; | |
266 | } | |
267 | ||
268 | int SCT_set_source(SCT *sct, sct_source_t source) | |
269 | { | |
270 | sct->source = source; | |
fa515410 | 271 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
8c6afbc5 RP |
272 | switch (source) { |
273 | case SCT_SOURCE_TLS_EXTENSION: | |
274 | case SCT_SOURCE_OCSP_STAPLED_RESPONSE: | |
275 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509); | |
276 | case SCT_SOURCE_X509V3_EXTENSION: | |
277 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT); | |
f3b3d7f0 RS |
278 | case SCT_SOURCE_UNKNOWN: |
279 | break; | |
8c6afbc5 | 280 | } |
f3b3d7f0 RS |
281 | /* if we aren't sure, leave the log entry type alone */ |
282 | return 1; | |
8c6afbc5 RP |
283 | } |
284 | ||
7d054e5a RP |
285 | sct_validation_status_t SCT_get_validation_status(const SCT *sct) |
286 | { | |
287 | return sct->validation_status; | |
288 | } | |
289 | ||
290 | int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx) | |
291 | { | |
292 | int is_sct_valid = -1; | |
293 | SCT_CTX *sctx = NULL; | |
294 | X509_PUBKEY *pub = NULL, *log_pkey = NULL; | |
8359b57f | 295 | const CTLOG *log; |
7d054e5a | 296 | |
43341433 VD |
297 | /* |
298 | * With an unrecognized SCT version we don't know what such an SCT means, | |
299 | * let alone validate one. So we return validation failure (0). | |
300 | */ | |
8359b57f | 301 | if (sct->version != SCT_VERSION_V1) { |
7d054e5a | 302 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION; |
43341433 | 303 | return 0; |
7d054e5a RP |
304 | } |
305 | ||
8359b57f RP |
306 | log = CTLOG_STORE_get0_log_by_id(ctx->log_store, |
307 | sct->log_id, sct->log_id_len); | |
308 | ||
43341433 | 309 | /* Similarly, an SCT from an unknown log also cannot be validated. */ |
8359b57f | 310 | if (log == NULL) { |
7d054e5a | 311 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG; |
43341433 | 312 | return 0; |
7d054e5a RP |
313 | } |
314 | ||
315 | sctx = SCT_CTX_new(); | |
316 | if (sctx == NULL) | |
317 | goto err; | |
318 | ||
8359b57f | 319 | if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1) |
7d054e5a RP |
320 | goto err; |
321 | if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1) | |
322 | goto err; | |
323 | ||
324 | if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) { | |
325 | EVP_PKEY *issuer_pkey; | |
326 | ||
327 | if (ctx->issuer == NULL) { | |
328 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; | |
329 | goto end; | |
330 | } | |
331 | ||
147e54a7 | 332 | issuer_pkey = X509_get0_pubkey(ctx->issuer); |
7d054e5a RP |
333 | |
334 | if (X509_PUBKEY_set(&pub, issuer_pkey) != 1) | |
335 | goto err; | |
336 | if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1) | |
337 | goto err; | |
338 | } | |
339 | ||
1fa9ffd9 RP |
340 | SCT_CTX_set_time(sctx, ctx->epoch_time_in_ms); |
341 | ||
43341433 VD |
342 | /* |
343 | * XXX: Potential for optimization. This repeats some idempotent heavy | |
344 | * lifting on the certificate for each candidate SCT, and appears to not | |
345 | * use any information in the SCT itself, only the certificate is | |
346 | * processed. So it may make more sense to to do this just once, perhaps | |
347 | * associated with the shared (by all SCTs) policy eval ctx. | |
348 | * | |
349 | * XXX: Failure here is global (SCT independent) and represents either an | |
350 | * issue with the certificate (e.g. duplicate extensions) or an out of | |
351 | * memory condition. When the certificate is incompatible with CT, we just | |
352 | * mark the SCTs invalid, rather than report a failure to determine the | |
353 | * validation status. That way, callbacks that want to do "soft" SCT | |
354 | * processing will not abort handshakes with false positive internal | |
355 | * errors. Since the function does not distinguish between certificate | |
356 | * issues (peer's fault) and internal problems (out fault) the safe thing | |
357 | * to do is to report a validation failure and let the callback or | |
358 | * application decide what to do. | |
359 | */ | |
7d054e5a | 360 | if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1) |
43341433 VD |
361 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; |
362 | else | |
cdb2a603 | 363 | sct->validation_status = SCT_CTX_verify(sctx, sct) == 1 ? |
7d054e5a RP |
364 | SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID; |
365 | ||
366 | end: | |
367 | is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID; | |
368 | err: | |
369 | X509_PUBKEY_free(pub); | |
370 | X509_PUBKEY_free(log_pkey); | |
371 | SCT_CTX_free(sctx); | |
372 | ||
373 | return is_sct_valid; | |
374 | } | |
375 | ||
376 | int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx) | |
377 | { | |
378 | int are_scts_valid = 1; | |
379 | int sct_count = scts != NULL ? sk_SCT_num(scts) : 0; | |
380 | int i; | |
381 | ||
382 | for (i = 0; i < sct_count; ++i) { | |
383 | int is_sct_valid = -1; | |
384 | SCT *sct = sk_SCT_value(scts, i); | |
385 | ||
386 | if (sct == NULL) | |
387 | continue; | |
388 | ||
389 | is_sct_valid = SCT_validate(sct, ctx); | |
390 | if (is_sct_valid < 0) | |
391 | return is_sct_valid; | |
392 | are_scts_valid &= is_sct_valid; | |
393 | } | |
394 | ||
395 | return are_scts_valid; | |
396 | } |