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diff --git a/src/lib/libcrypto/ct/ct_sct.c b/src/lib/libcrypto/ct/ct_sct.c
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1/* $OpenBSD: ct_sct.c,v 1.10 2023/07/22 17:02:49 tb Exp $ */
2/*
3 * Written by Rob Stradling (rob@comodo.com), Stephen Henson (steve@openssl.org)
4 * and Adam Eijdenberg (adam.eijdenberg@gmail.com) for the OpenSSL project 2016.
5 */
6/* ====================================================================
7 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#ifdef OPENSSL_NO_CT
61# error "CT disabled"
62#endif
63
64#include <stdint.h>
65#include <stdlib.h>
66#include <string.h>
67
68#include <openssl/asn1.h>
69#include <openssl/ct.h>
70#include <openssl/err.h>
71#include <openssl/objects.h>
72#include <openssl/x509.h>
73
74#include "ct_local.h"
75
76SCT *
77SCT_new(void)
78{
79 SCT *sct = calloc(1, sizeof(*sct));
80
81 if (sct == NULL) {
82 CTerror(ERR_R_MALLOC_FAILURE);
83 return NULL;
84 }
85
86 sct->entry_type = CT_LOG_ENTRY_TYPE_NOT_SET;
87 sct->version = SCT_VERSION_NOT_SET;
88 return sct;
89}
90LCRYPTO_ALIAS(SCT_new);
91
92void
93SCT_free(SCT *sct)
94{
95 if (sct == NULL)
96 return;
97
98 free(sct->log_id);
99 free(sct->ext);
100 free(sct->sig);
101 free(sct->sct);
102 free(sct);
103}
104LCRYPTO_ALIAS(SCT_free);
105
106void
107SCT_LIST_free(STACK_OF(SCT) *scts)
108{
109 sk_SCT_pop_free(scts, SCT_free);
110}
111LCRYPTO_ALIAS(SCT_LIST_free);
112
113int
114SCT_set_version(SCT *sct, sct_version_t version)
115{
116 if (version != SCT_VERSION_V1) {
117 CTerror(CT_R_UNSUPPORTED_VERSION);
118 return 0;
119 }
120 sct->version = version;
121 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
122 return 1;
123}
124LCRYPTO_ALIAS(SCT_set_version);
125
126int
127SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type)
128{
129 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
130
131 switch (entry_type) {
132 case CT_LOG_ENTRY_TYPE_X509:
133 case CT_LOG_ENTRY_TYPE_PRECERT:
134 sct->entry_type = entry_type;
135 return 1;
136 case CT_LOG_ENTRY_TYPE_NOT_SET:
137 break;
138 }
139 CTerror(CT_R_UNSUPPORTED_ENTRY_TYPE);
140 return 0;
141}
142LCRYPTO_ALIAS(SCT_set_log_entry_type);
143
144int
145SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len)
146{
147 if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) {
148 CTerror(CT_R_INVALID_LOG_ID_LENGTH);
149 return 0;
150 }
151
152 free(sct->log_id);
153 sct->log_id = log_id;
154 sct->log_id_len = log_id_len;
155 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
156 return 1;
157}
158LCRYPTO_ALIAS(SCT_set0_log_id);
159
160int
161SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len)
162{
163 if (sct->version == SCT_VERSION_V1 && log_id_len != CT_V1_HASHLEN) {
164 CTerror(CT_R_INVALID_LOG_ID_LENGTH);
165 return 0;
166 }
167
168 free(sct->log_id);
169 sct->log_id = NULL;
170 sct->log_id_len = 0;
171 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
172
173 if (log_id != NULL && log_id_len > 0) {
174 sct->log_id = malloc(log_id_len);
175 if (sct->log_id == NULL) {
176 CTerror(ERR_R_MALLOC_FAILURE);
177 return 0;
178 }
179 memcpy(sct->log_id, log_id, log_id_len);
180 sct->log_id_len = log_id_len;
181 }
182 return 1;
183}
184LCRYPTO_ALIAS(SCT_set1_log_id);
185
186
187void
188SCT_set_timestamp(SCT *sct, uint64_t timestamp)
189{
190 sct->timestamp = timestamp;
191 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
192}
193LCRYPTO_ALIAS(SCT_set_timestamp);
194
195int
196SCT_set_signature_nid(SCT *sct, int nid)
197{
198 switch (nid) {
199 case NID_sha256WithRSAEncryption:
200 sct->hash_alg = 4; /* XXX */
201 sct->sig_alg = 1; /* XXX */
202 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
203 return 1;
204 case NID_ecdsa_with_SHA256:
205 sct->hash_alg = 4; /* XXX */
206 sct->sig_alg = 3; /* XXX */
207 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
208 return 1;
209 default:
210 CTerror(CT_R_UNRECOGNIZED_SIGNATURE_NID);
211 return 0;
212 }
213}
214LCRYPTO_ALIAS(SCT_set_signature_nid);
215
216void
217SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len)
218{
219 free(sct->ext);
220 sct->ext = ext;
221 sct->ext_len = ext_len;
222 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
223}
224LCRYPTO_ALIAS(SCT_set0_extensions);
225
226int
227SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len)
228{
229 free(sct->ext);
230 sct->ext = NULL;
231 sct->ext_len = 0;
232 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
233
234 if (ext != NULL && ext_len > 0) {
235 sct->ext = malloc(ext_len);
236 if (sct->ext == NULL) {
237 CTerror(ERR_R_MALLOC_FAILURE);
238 return 0;
239 }
240 memcpy(sct->ext, ext, ext_len);
241 sct->ext_len = ext_len;
242 }
243 return 1;
244}
245LCRYPTO_ALIAS(SCT_set1_extensions);
246
247void
248SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len)
249{
250 free(sct->sig);
251 sct->sig = sig;
252 sct->sig_len = sig_len;
253 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
254}
255LCRYPTO_ALIAS(SCT_set0_signature);
256
257int
258SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len)
259{
260 free(sct->sig);
261 sct->sig = NULL;
262 sct->sig_len = 0;
263 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
264
265 if (sig != NULL && sig_len > 0) {
266 sct->sig = malloc(sig_len);
267 if (sct->sig == NULL) {
268 CTerror(ERR_R_MALLOC_FAILURE);
269 return 0;
270 }
271 memcpy(sct->sig, sig, sig_len);
272 sct->sig_len = sig_len;
273 }
274 return 1;
275}
276LCRYPTO_ALIAS(SCT_set1_signature);
277
278sct_version_t
279SCT_get_version(const SCT *sct)
280{
281 return sct->version;
282}
283LCRYPTO_ALIAS(SCT_get_version);
284
285ct_log_entry_type_t
286SCT_get_log_entry_type(const SCT *sct)
287{
288 return sct->entry_type;
289}
290LCRYPTO_ALIAS(SCT_get_log_entry_type);
291
292size_t
293SCT_get0_log_id(const SCT *sct, unsigned char **log_id)
294{
295 *log_id = sct->log_id;
296 return sct->log_id_len;
297}
298LCRYPTO_ALIAS(SCT_get0_log_id);
299
300uint64_t
301SCT_get_timestamp(const SCT *sct)
302{
303 return sct->timestamp;
304}
305LCRYPTO_ALIAS(SCT_get_timestamp);
306
307int
308SCT_get_signature_nid(const SCT *sct)
309{
310 if (sct->version == SCT_VERSION_V1) {
311 /* XXX sigalg numbers */
312 if (sct->hash_alg == 4) {
313 switch (sct->sig_alg) {
314 case 3:
315 return NID_ecdsa_with_SHA256;
316 case 1:
317 return NID_sha256WithRSAEncryption;
318 default:
319 return NID_undef;
320 }
321 }
322 }
323 return NID_undef;
324}
325LCRYPTO_ALIAS(SCT_get_signature_nid);
326
327size_t
328SCT_get0_extensions(const SCT *sct, unsigned char **ext)
329{
330 *ext = sct->ext;
331 return sct->ext_len;
332}
333LCRYPTO_ALIAS(SCT_get0_extensions);
334
335size_t
336SCT_get0_signature(const SCT *sct, unsigned char **sig)
337{
338 *sig = sct->sig;
339 return sct->sig_len;
340}
341LCRYPTO_ALIAS(SCT_get0_signature);
342
343int
344SCT_is_complete(const SCT *sct)
345{
346 switch (sct->version) {
347 case SCT_VERSION_NOT_SET:
348 return 0;
349 case SCT_VERSION_V1:
350 return sct->log_id != NULL && SCT_signature_is_complete(sct);
351 default:
352 return sct->sct != NULL; /* Just need cached encoding */
353 }
354}
355
356int
357SCT_signature_is_complete(const SCT *sct)
358{
359 return SCT_get_signature_nid(sct) != NID_undef &&
360 sct->sig != NULL && sct->sig_len > 0;
361}
362
363sct_source_t
364SCT_get_source(const SCT *sct)
365{
366 return sct->source;
367}
368LCRYPTO_ALIAS(SCT_get_source);
369
370int
371SCT_set_source(SCT *sct, sct_source_t source)
372{
373 sct->source = source;
374 sct->validation_status = SCT_VALIDATION_STATUS_NOT_SET;
375 switch (source) {
376 case SCT_SOURCE_TLS_EXTENSION:
377 case SCT_SOURCE_OCSP_STAPLED_RESPONSE:
378 return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_X509);
379 case SCT_SOURCE_X509V3_EXTENSION:
380 return SCT_set_log_entry_type(sct, CT_LOG_ENTRY_TYPE_PRECERT);
381 case SCT_SOURCE_UNKNOWN:
382 break;
383 }
384 /* if we aren't sure, leave the log entry type alone */
385 return 1;
386}
387LCRYPTO_ALIAS(SCT_set_source);
388
389sct_validation_status_t
390SCT_get_validation_status(const SCT *sct)
391{
392 return sct->validation_status;
393}
394LCRYPTO_ALIAS(SCT_get_validation_status);
395
396int
397SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx)
398{
399 int is_sct_valid = -1;
400 SCT_CTX *sctx = NULL;
401 X509_PUBKEY *pub = NULL, *log_pkey = NULL;
402 const CTLOG *log;
403
404 /*
405 * With an unrecognized SCT version we don't know what such an SCT means,
406 * let alone validate one. So we return validation failure (0).
407 */
408 if (sct->version != SCT_VERSION_V1) {
409 sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_VERSION;
410 return 0;
411 }
412
413 log = CTLOG_STORE_get0_log_by_id(ctx->log_store, sct->log_id,
414 sct->log_id_len);
415
416 /* Similarly, an SCT from an unknown log also cannot be validated. */
417 if (log == NULL) {
418 sct->validation_status = SCT_VALIDATION_STATUS_UNKNOWN_LOG;
419 return 0;
420 }
421
422 sctx = SCT_CTX_new();
423 if (sctx == NULL)
424 goto err;
425
426 if (X509_PUBKEY_set(&log_pkey, CTLOG_get0_public_key(log)) != 1)
427 goto err;
428 if (SCT_CTX_set1_pubkey(sctx, log_pkey) != 1)
429 goto err;
430
431 if (SCT_get_log_entry_type(sct) == CT_LOG_ENTRY_TYPE_PRECERT) {
432 EVP_PKEY *issuer_pkey;
433
434 if (ctx->issuer == NULL) {
435 sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED;
436 goto end;
437 }
438
439 if ((issuer_pkey = X509_get0_pubkey(ctx->issuer)) == NULL)
440 goto err;
441
442 if (X509_PUBKEY_set(&pub, issuer_pkey) != 1)
443 goto err;
444 if (SCT_CTX_set1_issuer_pubkey(sctx, pub) != 1)
445 goto err;
446 }
447
448 SCT_CTX_set_time(sctx, ctx->epoch_time_in_ms);
449
450 /*
451 * XXX: Potential for optimization. This repeats some idempotent heavy
452 * lifting on the certificate for each candidate SCT, and appears to not
453 * use any information in the SCT itself, only the certificate is
454 * processed. So it may make more sense to to do this just once, perhaps
455 * associated with the shared (by all SCTs) policy eval ctx.
456 *
457 * XXX: Failure here is global (SCT independent) and represents either an
458 * issue with the certificate (e.g. duplicate extensions) or an out of
459 * memory condition. When the certificate is incompatible with CT, we just
460 * mark the SCTs invalid, rather than report a failure to determine the
461 * validation status. That way, callbacks that want to do "soft" SCT
462 * processing will not abort handshakes with false positive internal
463 * errors. Since the function does not distinguish between certificate
464 * issues (peer's fault) and internal problems (out fault) the safe thing
465 * to do is to report a validation failure and let the callback or
466 * application decide what to do.
467 */
468 if (SCT_CTX_set1_cert(sctx, ctx->cert, NULL) != 1)
469 sct->validation_status = SCT_VALIDATION_STATUS_UNVERIFIED;
470 else
471 sct->validation_status = SCT_CTX_verify(sctx, sct) == 1 ?
472 SCT_VALIDATION_STATUS_VALID : SCT_VALIDATION_STATUS_INVALID;
473
474 end:
475 is_sct_valid = sct->validation_status == SCT_VALIDATION_STATUS_VALID;
476 err:
477 X509_PUBKEY_free(pub);
478 X509_PUBKEY_free(log_pkey);
479 SCT_CTX_free(sctx);
480
481 return is_sct_valid;
482}
483LCRYPTO_ALIAS(SCT_validate);
484
485int
486SCT_LIST_validate(const STACK_OF(SCT) *scts, CT_POLICY_EVAL_CTX *ctx)
487{
488 int are_scts_valid = 1;
489 int sct_count = scts != NULL ? sk_SCT_num(scts) : 0;
490 int i;
491
492 for (i = 0; i < sct_count; ++i) {
493 int is_sct_valid = -1;
494 SCT *sct = sk_SCT_value(scts, i);
495
496 if (sct == NULL)
497 continue;
498
499 is_sct_valid = SCT_validate(sct, ctx);
500 if (is_sct_valid < 0)
501 return is_sct_valid;
502 are_scts_valid &= is_sct_valid;
503 }
504
505 return are_scts_valid;
506}
507LCRYPTO_ALIAS(SCT_LIST_validate);