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3149baf8 | 1 | /* |
d2e9e320 | 2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. |
3149baf8 | 3 | * |
d2e9e320 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
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 | |
0cea8832 | 20 | #include "ct_locl.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 | ||
48 | int SCT_set_version(SCT *sct, sct_version_t version) | |
49 | { | |
0cea8832 | 50 | if (version != SCT_VERSION_V1) { |
3149baf8 AE |
51 | CTerr(CT_F_SCT_SET_VERSION, CT_R_UNSUPPORTED_VERSION); |
52 | return 0; | |
53 | } | |
54 | sct->version = version; | |
6d7fd9c1 | 55 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
56 | return 1; |
57 | } | |
58 | ||
0cea8832 | 59 | int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type) |
3149baf8 | 60 | { |
6d7fd9c1 RP |
61 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
62 | ||
0cea8832 RP |
63 | switch (entry_type) { |
64 | case CT_LOG_ENTRY_TYPE_X509: | |
65 | case CT_LOG_ENTRY_TYPE_PRECERT: | |
66 | sct->entry_type = entry_type; | |
67 | return 1; | |
68 | default: | |
3149baf8 AE |
69 | CTerr(CT_F_SCT_SET_LOG_ENTRY_TYPE, CT_R_UNSUPPORTED_ENTRY_TYPE); |
70 | return 0; | |
71 | } | |
3149baf8 AE |
72 | } |
73 | ||
74 | int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len) | |
75 | { | |
0cea8832 | 76 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
3149baf8 AE |
77 | CTerr(CT_F_SCT_SET0_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
78 | return 0; | |
79 | } | |
0cea8832 | 80 | |
3149baf8 AE |
81 | OPENSSL_free(sct->log_id); |
82 | sct->log_id = log_id; | |
83 | sct->log_id_len = log_id_len; | |
6d7fd9c1 | 84 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
85 | return 1; |
86 | } | |
87 | ||
5ad29c54 AE |
88 | int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len) |
89 | { | |
0cea8832 | 90 | if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) { |
5ad29c54 AE |
91 | CTerr(CT_F_SCT_SET1_LOG_ID, CT_R_INVALID_LOG_ID_LENGTH); |
92 | return 0; | |
93 | } | |
94 | ||
95 | OPENSSL_free(sct->log_id); | |
0cea8832 RP |
96 | sct->log_id = NULL; |
97 | sct->log_id_len = 0; | |
6d7fd9c1 | 98 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 | 99 | |
0cea8832 RP |
100 | if (log_id != NULL && log_id_len > 0) { |
101 | sct->log_id = OPENSSL_memdup(log_id, log_id_len); | |
5ad29c54 AE |
102 | if (sct->log_id == NULL) { |
103 | CTerr(CT_F_SCT_SET1_LOG_ID, ERR_R_MALLOC_FAILURE); | |
104 | return 0; | |
105 | } | |
0cea8832 | 106 | sct->log_id_len = log_id_len; |
5ad29c54 | 107 | } |
5ad29c54 AE |
108 | return 1; |
109 | } | |
110 | ||
111 | ||
3149baf8 AE |
112 | void SCT_set_timestamp(SCT *sct, uint64_t timestamp) |
113 | { | |
114 | sct->timestamp = timestamp; | |
6d7fd9c1 | 115 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
116 | } |
117 | ||
118 | int SCT_set_signature_nid(SCT *sct, int nid) | |
119 | { | |
700b8145 | 120 | switch (nid) { |
3149baf8 AE |
121 | case NID_sha256WithRSAEncryption: |
122 | sct->hash_alg = TLSEXT_hash_sha256; | |
123 | sct->sig_alg = TLSEXT_signature_rsa; | |
6d7fd9c1 | 124 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
125 | return 1; |
126 | case NID_ecdsa_with_SHA256: | |
127 | sct->hash_alg = TLSEXT_hash_sha256; | |
128 | sct->sig_alg = TLSEXT_signature_ecdsa; | |
6d7fd9c1 | 129 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
130 | return 1; |
131 | default: | |
132 | CTerr(CT_F_SCT_SET_SIGNATURE_NID, CT_R_UNRECOGNIZED_SIGNATURE_NID); | |
133 | return 0; | |
134 | } | |
135 | } | |
136 | ||
137 | void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len) | |
138 | { | |
139 | OPENSSL_free(sct->ext); | |
140 | sct->ext = ext; | |
141 | sct->ext_len = ext_len; | |
6d7fd9c1 | 142 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
3149baf8 AE |
143 | } |
144 | ||
5ad29c54 AE |
145 | int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len) |
146 | { | |
147 | OPENSSL_free(sct->ext); | |
148 | sct->ext = NULL; | |
149 | sct->ext_len = 0; | |
6d7fd9c1 | 150 | sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET; |
5ad29c54 AE |
151 | |
152 | if (ext != NULL && ext_len > 0) { | |
153 | sct->ext = OPENSSL_memdup(ext, ext_len); | |
154 | if (sct->ext == NULL) { | |
155 | CTerr(CT_F_SCT_SET1_EXTENSIONS, ERR_R_MALLOC_FAILURE); | |
156 | return 0; | |
157 | } | |
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 AE |
179 | sct->sig = OPENSSL_memdup(sig, sig_len); |
180 | if (sct->sig == NULL) { | |
181 | CTerr(CT_F_SCT_SET1_SIGNATURE, ERR_R_MALLOC_FAILURE); | |
182 | return 0; | |
183 | } | |
0cea8832 | 184 | sct->sig_len = sig_len; |
5ad29c54 | 185 | } |
5ad29c54 AE |
186 | return 1; |
187 | } | |
188 | ||
3149baf8 AE |
189 | sct_version_t SCT_get_version(const SCT *sct) |
190 | { | |
191 | return sct->version; | |
192 | } | |
193 | ||
0cea8832 | 194 | ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct) |
3149baf8 AE |
195 | { |
196 | return sct->entry_type; | |
197 | } | |
198 | ||
199 | size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id) | |
200 | { | |
201 | *log_id = sct->log_id; | |
202 | return sct->log_id_len; | |
203 | } | |
204 | ||
205 | uint64_t SCT_get_timestamp(const SCT *sct) | |
206 | { | |
207 | return sct->timestamp; | |
208 | } | |
209 | ||
210 | int SCT_get_signature_nid(const SCT *sct) | |
211 | { | |
0cea8832 | 212 | if (sct->version == SCT_VERSION_V1) { |
3149baf8 AE |
213 | if (sct->hash_alg == TLSEXT_hash_sha256) { |
214 | switch (sct->sig_alg) { | |
215 | case TLSEXT_signature_ecdsa: | |
216 | return NID_ecdsa_with_SHA256; | |
217 | case TLSEXT_signature_rsa: | |
218 | return NID_sha256WithRSAEncryption; | |
219 | default: | |
220 | return NID_undef; | |
221 | } | |
222 | } | |
223 | } | |
224 | return NID_undef; | |
225 | } | |
226 | ||
227 | size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext) | |
228 | { | |
229 | *ext = sct->ext; | |
230 | return sct->ext_len; | |
231 | } | |
232 | ||
233 | size_t SCT_get0_signature(const SCT *sct, unsigned char **sig) | |
234 | { | |
235 | *sig = sct->sig; | |
236 | return sct->sig_len; | |
237 | } | |
238 | ||
0cea8832 | 239 | int SCT_is_complete(const SCT *sct) |
5ad29c54 AE |
240 | { |
241 | switch (sct->version) { | |
0cea8832 | 242 | case SCT_VERSION_NOT_SET: |
5ad29c54 | 243 | return 0; |
0cea8832 RP |
244 | case SCT_VERSION_V1: |
245 | return sct->log_id != NULL && SCT_signature_is_complete(sct); | |
5ad29c54 AE |
246 | default: |
247 | return sct->sct != NULL; /* Just need cached encoding */ | |
248 | } | |
249 | } | |
250 | ||
0cea8832 RP |
251 | int SCT_signature_is_complete(const SCT *sct) |
252 | { | |
253 | return SCT_get_signature_nid(sct) != NID_undef && | |
254 | sct->sig != NULL && sct->sig_len > 0; | |
255 | } | |
256 | ||
8c6afbc5 RP |
257 | sct_source_t SCT_get_source(const SCT *sct) |
258 | { | |
259 | return sct->source; | |
260 | } | |
261 | ||
262 | int SCT_set_source(SCT *sct, sct_source_t source) | |
263 | { | |
264 | sct->source = source; | |
265 | switch (source) { | |
266 | case SCT_SOURCE_TLS_EXTENSION: | |
267 | case SCT_SOURCE_OCSP_STAPLED_RESPONSE: | |
268 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509); | |
269 | case SCT_SOURCE_X509V3_EXTENSION: | |
270 | return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT); | |
271 | default: /* if we aren't sure, leave the log entry type alone */ | |
272 | return 1; | |
273 | } | |
274 | } | |
275 | ||
7d054e5a RP |
276 | sct_validation_status_t SCT_get_validation_status(const SCT *sct) |
277 | { | |
278 | return sct->validation_status; | |
279 | } | |
280 | ||
281 | int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx) | |
282 | { | |
283 | int is_sct_valid = -1; | |
284 | SCT_CTX *sctx = NULL; | |
285 | X509_PUBKEY *pub = NULL, *log_pkey = NULL; | |
8359b57f | 286 | const CTLOG *log; |
7d054e5a | 287 | |
43341433 VD |
288 | /* |
289 | * With an unrecognized SCT version we don't know what such an SCT means, | |
290 | * let alone validate one. So we return validation failure (0). | |
291 | */ | |
8359b57f | 292 | if (sct->version != SCT_VERSION_V1) { |
7d054e5a | 293 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION; |
43341433 | 294 | return 0; |
7d054e5a RP |
295 | } |
296 | ||
8359b57f RP |
297 | log = CTLOG_STORE_get0_log_by_id(ctx->log_store, |
298 | sct->log_id, sct->log_id_len); | |
299 | ||
43341433 | 300 | /* Similarly, an SCT from an unknown log also cannot be validated. */ |
8359b57f | 301 | if (log == NULL) { |
7d054e5a | 302 | sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG; |
43341433 | 303 | return 0; |
7d054e5a RP |
304 | } |
305 | ||
306 | sctx = SCT_CTX_new(); | |
307 | if (sctx == NULL) | |
308 | goto err; | |
309 | ||
8359b57f | 310 | if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1) |
7d054e5a RP |
311 | goto err; |
312 | if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1) | |
313 | goto err; | |
314 | ||
315 | if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) { | |
316 | EVP_PKEY *issuer_pkey; | |
317 | ||
318 | if (ctx->issuer == NULL) { | |
319 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; | |
320 | goto end; | |
321 | } | |
322 | ||
147e54a7 | 323 | issuer_pkey = X509_get0_pubkey(ctx->issuer); |
7d054e5a RP |
324 | |
325 | if (X509_PUBKEY_set(&pub, issuer_pkey) != 1) | |
326 | goto err; | |
327 | if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1) | |
328 | goto err; | |
329 | } | |
330 | ||
43341433 VD |
331 | /* |
332 | * XXX: Potential for optimization. This repeats some idempotent heavy | |
333 | * lifting on the certificate for each candidate SCT, and appears to not | |
334 | * use any information in the SCT itself, only the certificate is | |
335 | * processed. So it may make more sense to to do this just once, perhaps | |
336 | * associated with the shared (by all SCTs) policy eval ctx. | |
337 | * | |
338 | * XXX: Failure here is global (SCT independent) and represents either an | |
339 | * issue with the certificate (e.g. duplicate extensions) or an out of | |
340 | * memory condition. When the certificate is incompatible with CT, we just | |
341 | * mark the SCTs invalid, rather than report a failure to determine the | |
342 | * validation status. That way, callbacks that want to do "soft" SCT | |
343 | * processing will not abort handshakes with false positive internal | |
344 | * errors. Since the function does not distinguish between certificate | |
345 | * issues (peer's fault) and internal problems (out fault) the safe thing | |
346 | * to do is to report a validation failure and let the callback or | |
347 | * application decide what to do. | |
348 | */ | |
7d054e5a | 349 | if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1) |
43341433 VD |
350 | sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED; |
351 | else | |
cdb2a603 | 352 | sct->validation_status = SCT_CTX_verify(sctx, sct) == 1 ? |
7d054e5a RP |
353 | SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID; |
354 | ||
355 | end: | |
356 | is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID; | |
357 | err: | |
358 | X509_PUBKEY_free(pub); | |
359 | X509_PUBKEY_free(log_pkey); | |
360 | SCT_CTX_free(sctx); | |
361 | ||
362 | return is_sct_valid; | |
363 | } | |
364 | ||
365 | int SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx) | |
366 | { | |
367 | int are_scts_valid = 1; | |
368 | int sct_count = scts != NULL ? sk_SCT_num(scts) : 0; | |
369 | int i; | |
370 | ||
371 | for (i = 0; i < sct_count; ++i) { | |
372 | int is_sct_valid = -1; | |
373 | SCT *sct = sk_SCT_value(scts, i); | |
374 | ||
375 | if (sct == NULL) | |
376 | continue; | |
377 | ||
378 | is_sct_valid = SCT_validate(sct, ctx); | |
379 | if (is_sct_valid < 0) | |
380 | return is_sct_valid; | |
381 | are_scts_valid &= is_sct_valid; | |
382 | } | |
383 | ||
384 | return are_scts_valid; | |
385 | } |