1/*
2 * Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/objects.h>
13#include <openssl/ts.h>
14#include <openssl/pkcs7.h>
15#include "ts_local.h"
16#include "crypto/ess.h"
17
18static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
19 X509 *signer, STACK_OF(X509) **chain);
20static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
21 STACK_OF(X509) *chain);
22static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert);
23static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert);
24static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
25 PKCS7 *token, TS_TST_INFO *tst_info);
26static int ts_check_status_info(TS_RESP *response);
27static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text);
28static int ts_check_policy(const ASN1_OBJECT *req_oid,
29 const TS_TST_INFO *tst_info);
30static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
31 X509_ALGOR **md_alg,
32 unsigned char **imprint, unsigned *imprint_len);
33static int ts_check_imprints(X509_ALGOR *algor_a,
34 const unsigned char *imprint_a, unsigned len_a,
35 TS_TST_INFO *tst_info);
36static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info);
37static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer);
38static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names,
39 GENERAL_NAME *name);
40static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert);
41
42/*
43 * This must be large enough to hold all values in ts_status_text (with
44 * comma separator) or all text fields in ts_failure_info (also with comma).
45 */
46#define TS_STATUS_BUF_SIZE 256
47
48/*
49 * Local mapping between response codes and descriptions.
50 */
51static const char *ts_status_text[] = {
52 "granted",
53 "grantedWithMods",
54 "rejection",
55 "waiting",
56 "revocationWarning",
57 "revocationNotification"
58};
59
60#define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text)
61
62static struct {
63 int code;
64 const char *text;
65} ts_failure_info[] = {
66 {TS_INFO_BAD_ALG, "badAlg"},
67 {TS_INFO_BAD_REQUEST, "badRequest"},
68 {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"},
69 {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"},
70 {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"},
71 {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"},
72 {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"},
73 {TS_INFO_SYSTEM_FAILURE, "systemFailure"}
74};
75
76
77/*-
78 * This function carries out the following tasks:
79 * - Checks if there is one and only one signer.
80 * - Search for the signing certificate in 'certs' and in the response.
81 * - Check the extended key usage and key usage fields of the signer
82 * certificate (done by the path validation).
83 * - Build and validate the certificate path.
84 * - Check if the certificate path meets the requirements of the
85 * SigningCertificate ESS signed attribute.
86 * - Verify the signature value.
87 * - Returns the signer certificate in 'signer', if 'signer' is not NULL.
88 */
89int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
90 X509_STORE *store, X509 **signer_out)
91{
92 STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL;
93 PKCS7_SIGNER_INFO *si;
94 STACK_OF(X509) *signers = NULL;
95 X509 *signer;
96 STACK_OF(X509) *chain = NULL;
97 char buf[4096];
98 int i, j = 0, ret = 0;
99 BIO *p7bio = NULL;
100
101 /* Some sanity checks first. */
102 if (!token) {
103 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER);
104 goto err;
105 }
106 if (!PKCS7_type_is_signed(token)) {
107 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE);
108 goto err;
109 }
110 sinfos = PKCS7_get_signer_info(token);
111 if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) {
112 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER);
113 goto err;
114 }
115 si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
116 if (PKCS7_get_detached(token)) {
117 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT);
118 goto err;
119 }
120
121 /*
122 * Get hold of the signer certificate, search only internal certificates
123 * if it was requested.
124 */
125 signers = PKCS7_get0_signers(token, certs, 0);
126 if (!signers || sk_X509_num(signers) != 1)
127 goto err;
128 signer = sk_X509_value(signers, 0);
129
130 if (!ts_verify_cert(store, certs, signer, &chain))
131 goto err;
132 if (!ts_check_signing_certs(si, chain))
133 goto err;
134 p7bio = PKCS7_dataInit(token, NULL);
135
136 /* We now have to 'read' from p7bio to calculate digests etc. */
137 while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0)
138 continue;
139
140 j = PKCS7_signatureVerify(p7bio, token, si, signer);
141 if (j <= 0) {
142 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE);
143 goto err;
144 }
145
146 if (signer_out) {
147 *signer_out = signer;
148 X509_up_ref(signer);
149 }
150 ret = 1;
151
152 err:
153 BIO_free_all(p7bio);
154 sk_X509_pop_free(chain, X509_free);
155 sk_X509_free(signers);
156
157 return ret;
158}
159
160/*
161 * The certificate chain is returned in chain. Caller is responsible for
162 * freeing the vector.
163 */
164static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
165 X509 *signer, STACK_OF(X509) **chain)
166{
167 X509_STORE_CTX *cert_ctx = NULL;
168 int i;
169 int ret = 0;
170
171 *chain = NULL;
172 cert_ctx = X509_STORE_CTX_new();
173 if (cert_ctx == NULL) {
174 TSerr(TS_F_TS_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
175 goto err;
176 }
177 if (!X509_STORE_CTX_init(cert_ctx, store, signer, untrusted))
178 goto end;
179 X509_STORE_CTX_set_purpose(cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
180 i = X509_verify_cert(cert_ctx);
181 if (i <= 0) {
182 int j = X509_STORE_CTX_get_error(cert_ctx);
183 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
184 ERR_add_error_data(2, "Verify error:",
185 X509_verify_cert_error_string(j));
186 goto err;
187 }
188 *chain = X509_STORE_CTX_get1_chain(cert_ctx);
189 ret = 1;
190 goto end;
191
192err:
193 ret = 0;
194
195end:
196 X509_STORE_CTX_free(cert_ctx);
197 return ret;
198}
199
200static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
201 STACK_OF(X509) *chain)
202{
203 ESS_SIGNING_CERT *ss = ESS_SIGNING_CERT_get(si);
204 STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
205 ESS_SIGNING_CERT_V2 *ssv2 = ESS_SIGNING_CERT_V2_get(si);
206 STACK_OF(ESS_CERT_ID_V2) *cert_ids_v2 = NULL;
207 X509 *cert;
208 int i = 0;
209 int ret = 0;
210
211 if (ss != NULL) {
212 cert_ids = ss->cert_ids;
213 cert = sk_X509_value(chain, 0);
214 if (ts_find_cert(cert_ids, cert) != 0)
215 goto err;
216
217 /*
218 * Check the other certificates of the chain if there are more than one
219 * certificate ids in cert_ids.
220 */
221 if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
222 for (i = 1; i < sk_X509_num(chain); ++i) {
223 cert = sk_X509_value(chain, i);
224 if (ts_find_cert(cert_ids, cert) < 0)
225 goto err;
226 }
227 }
228 } else if (ssv2 != NULL) {
229 cert_ids_v2 = ssv2->cert_ids;
230 cert = sk_X509_value(chain, 0);
231 if (ts_find_cert_v2(cert_ids_v2, cert) != 0)
232 goto err;
233
234 /*
235 * Check the other certificates of the chain if there are more than one
236 * certificate ids in cert_ids.
237 */
238 if (sk_ESS_CERT_ID_V2_num(cert_ids_v2) > 1) {
239 for (i = 1; i < sk_X509_num(chain); ++i) {
240 cert = sk_X509_value(chain, i);
241 if (ts_find_cert_v2(cert_ids_v2, cert) < 0)
242 goto err;
243 }
244 }
245 } else {
246 goto err;
247 }
248
249 ret = 1;
250 err:
251 if (!ret)
252 TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
253 TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
254 ESS_SIGNING_CERT_free(ss);
255 ESS_SIGNING_CERT_V2_free(ssv2);
256 return ret;
257}
258
259/* Returns < 0 if certificate is not found, certificate index otherwise. */
260static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
261{
262 int i;
263 unsigned char cert_sha1[SHA_DIGEST_LENGTH];
264
265 if (!cert_ids || !cert)
266 return -1;
267
268 X509_digest(cert, EVP_sha1(), cert_sha1, NULL);
269
270 /* Recompute SHA1 hash of certificate if necessary (side effect). */
271 X509_check_purpose(cert, -1, 0);
272
273 /* Look for cert in the cert_ids vector. */
274 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
275 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
276
277 if (cid->hash->length == SHA_DIGEST_LENGTH
278 && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) {
279 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
280 if (!is || !ts_issuer_serial_cmp(is, cert))
281 return i;
282 }
283 }
284
285 return -1;
286}
287
288/* Returns < 0 if certificate is not found, certificate index otherwise. */
289static int ts_find_cert_v2(STACK_OF(ESS_CERT_ID_V2) *cert_ids, X509 *cert)
290{
291 int i;
292 unsigned char cert_digest[EVP_MAX_MD_SIZE];
293 unsigned int len;
294
295 /* Look for cert in the cert_ids vector. */
296 for (i = 0; i < sk_ESS_CERT_ID_V2_num(cert_ids); ++i) {
297 ESS_CERT_ID_V2 *cid = sk_ESS_CERT_ID_V2_value(cert_ids, i);
298 const EVP_MD *md;
299
300 if (cid->hash_alg != NULL)
301 md = EVP_get_digestbyobj(cid->hash_alg->algorithm);
302 else
303 md = EVP_sha256();
304
305 X509_digest(cert, md, cert_digest, &len);
306 if (cid->hash->length != (int)len)
307 return -1;
308
309 if (memcmp(cid->hash->data, cert_digest, cid->hash->length) == 0) {
310 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
311
312 if (is == NULL || !ts_issuer_serial_cmp(is, cert))
313 return i;
314 }
315 }
316
317 return -1;
318}
319
320static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert)
321{
322 GENERAL_NAME *issuer;
323
324 if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1)
325 return -1;
326
327 issuer = sk_GENERAL_NAME_value(is->issuer, 0);
328 if (issuer->type != GEN_DIRNAME
329 || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert)))
330 return -1;
331
332 if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert)))
333 return -1;
334
335 return 0;
336}
337
338/*-
339 * Verifies whether 'response' contains a valid response with regards
340 * to the settings of the context:
341 * - Gives an error message if the TS_TST_INFO is not present.
342 * - Calls _TS_RESP_verify_token to verify the token content.
343 */
344int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
345{
346 PKCS7 *token = response->token;
347 TS_TST_INFO *tst_info = response->tst_info;
348 int ret = 0;
349
350 if (!ts_check_status_info(response))
351 goto err;
352 if (!int_ts_RESP_verify_token(ctx, token, tst_info))
353 goto err;
354 ret = 1;
355
356 err:
357 return ret;
358}
359
360/*
361 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
362 * calls the internal int_TS_RESP_verify_token function for verifying it.
363 */
364int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
365{
366 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
367 int ret = 0;
368 if (tst_info) {
369 ret = int_ts_RESP_verify_token(ctx, token, tst_info);
370 TS_TST_INFO_free(tst_info);
371 }
372 return ret;
373}
374
375/*-
376 * Verifies whether the 'token' contains a valid time stamp token
377 * with regards to the settings of the context. Only those checks are
378 * carried out that are specified in the context:
379 * - Verifies the signature of the TS_TST_INFO.
380 * - Checks the version number of the response.
381 * - Check if the requested and returned policies math.
382 * - Check if the message imprints are the same.
383 * - Check if the nonces are the same.
384 * - Check if the TSA name matches the signer.
385 * - Check if the TSA name is the expected TSA.
386 */
387static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
388 PKCS7 *token, TS_TST_INFO *tst_info)
389{
390 X509 *signer = NULL;
391 GENERAL_NAME *tsa_name = tst_info->tsa;
392 X509_ALGOR *md_alg = NULL;
393 unsigned char *imprint = NULL;
394 unsigned imprint_len = 0;
395 int ret = 0;
396 int flags = ctx->flags;
397
398 /* Some options require us to also check the signature */
399 if (((flags & TS_VFY_SIGNER) && tsa_name != NULL)
400 || (flags & TS_VFY_TSA_NAME)) {
401 flags |= TS_VFY_SIGNATURE;
402 }
403
404 if ((flags & TS_VFY_SIGNATURE)
405 && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
406 goto err;
407 if ((flags & TS_VFY_VERSION)
408 && TS_TST_INFO_get_version(tst_info) != 1) {
409 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
410 goto err;
411 }
412 if ((flags & TS_VFY_POLICY)
413 && !ts_check_policy(ctx->policy, tst_info))
414 goto err;
415 if ((flags & TS_VFY_IMPRINT)
416 && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
417 tst_info))
418 goto err;
419 if ((flags & TS_VFY_DATA)
420 && (!ts_compute_imprint(ctx->data, tst_info,
421 &md_alg, &imprint, &imprint_len)
422 || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info)))
423 goto err;
424 if ((flags & TS_VFY_NONCE)
425 && !ts_check_nonces(ctx->nonce, tst_info))
426 goto err;
427 if ((flags & TS_VFY_SIGNER)
428 && tsa_name && !ts_check_signer_name(tsa_name, signer)) {
429 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
430 goto err;
431 }
432 if ((flags & TS_VFY_TSA_NAME)
433 && !ts_check_signer_name(ctx->tsa_name, signer)) {
434 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
435 goto err;
436 }
437 ret = 1;
438
439 err:
440 X509_free(signer);
441 X509_ALGOR_free(md_alg);
442 OPENSSL_free(imprint);
443 return ret;
444}
445
446static int ts_check_status_info(TS_RESP *response)
447{
448 TS_STATUS_INFO *info = response->status_info;
449 long status = ASN1_INTEGER_get(info->status);
450 const char *status_text = NULL;
451 char *embedded_status_text = NULL;
452 char failure_text[TS_STATUS_BUF_SIZE] = "";
453
454 if (status == 0 || status == 1)
455 return 1;
456
457 /* There was an error, get the description in status_text. */
458 if (0 <= status && status < (long) OSSL_NELEM(ts_status_text))
459 status_text = ts_status_text[status];
460 else
461 status_text = "unknown code";
462
463 if (sk_ASN1_UTF8STRING_num(info->text) > 0
464 && (embedded_status_text = ts_get_status_text(info->text)) == NULL)
465 return 0;
466
467 /* Fill in failure_text with the failure information. */
468 if (info->failure_info) {
469 int i;
470 int first = 1;
471 for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) {
472 if (ASN1_BIT_STRING_get_bit(info->failure_info,
473 ts_failure_info[i].code)) {
474 if (!first)
475 strcat(failure_text, ",");
476 else
477 first = 0;
478 strcat(failure_text, ts_failure_info[i].text);
479 }
480 }
481 }
482 if (failure_text[0] == '\0')
483 strcpy(failure_text, "unspecified");
484
485 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
486 ERR_add_error_data(6,
487 "status code: ", status_text,
488 ", status text: ", embedded_status_text ?
489 embedded_status_text : "unspecified",
490 ", failure codes: ", failure_text);
491 OPENSSL_free(embedded_status_text);
492
493 return 0;
494}
495
496static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
497{
498 int i;
499 int length = 0;
500 char *result = NULL;
501 char *p;
502
503 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
504 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
505 if (ASN1_STRING_length(current) > TS_MAX_STATUS_LENGTH - length - 1)
506 return NULL;
507 length += ASN1_STRING_length(current);
508 length += 1; /* separator character */
509 }
510 if ((result = OPENSSL_malloc(length)) == NULL) {
511 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
512 return NULL;
513 }
514
515 for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) {
516 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
517 length = ASN1_STRING_length(current);
518 if (i > 0)
519 *p++ = '/';
520 strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
521 p += length;
522 }
523 *p = '\0';
524
525 return result;
526}
527
528static int ts_check_policy(const ASN1_OBJECT *req_oid,
529 const TS_TST_INFO *tst_info)
530{
531 const ASN1_OBJECT *resp_oid = tst_info->policy_id;
532
533 if (OBJ_cmp(req_oid, resp_oid) != 0) {
534 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
535 return 0;
536 }
537
538 return 1;
539}
540
541static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
542 X509_ALGOR **md_alg,
543 unsigned char **imprint, unsigned *imprint_len)
544{
545 TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint;
546 X509_ALGOR *md_alg_resp = msg_imprint->hash_algo;
547 const EVP_MD *md;
548 EVP_MD_CTX *md_ctx = NULL;
549 unsigned char buffer[4096];
550 int length;
551
552 *md_alg = NULL;
553 *imprint = NULL;
554
555 if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL)
556 goto err;
557 if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) {
558 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
559 goto err;
560 }
561 length = EVP_MD_size(md);
562 if (length < 0)
563 goto err;
564 *imprint_len = length;
565 if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) {
566 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
567 goto err;
568 }
569
570 md_ctx = EVP_MD_CTX_new();
571 if (md_ctx == NULL) {
572 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
573 goto err;
574 }
575 if (!EVP_DigestInit(md_ctx, md))
576 goto err;
577 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
578 if (!EVP_DigestUpdate(md_ctx, buffer, length))
579 goto err;
580 }
581 if (!EVP_DigestFinal(md_ctx, *imprint, NULL))
582 goto err;
583 EVP_MD_CTX_free(md_ctx);
584
585 return 1;
586 err:
587 EVP_MD_CTX_free(md_ctx);
588 X509_ALGOR_free(*md_alg);
589 OPENSSL_free(*imprint);
590 *imprint_len = 0;
591 *imprint = 0;
592 return 0;
593}
594
595static int ts_check_imprints(X509_ALGOR *algor_a,
596 const unsigned char *imprint_a, unsigned len_a,
597 TS_TST_INFO *tst_info)
598{
599 TS_MSG_IMPRINT *b = tst_info->msg_imprint;
600 X509_ALGOR *algor_b = b->hash_algo;
601 int ret = 0;
602
603 if (algor_a) {
604 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
605 goto err;
606
607 /* The parameter must be NULL in both. */
608 if ((algor_a->parameter
609 && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL)
610 || (algor_b->parameter
611 && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
612 goto err;
613 }
614
615 ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) &&
616 memcmp(imprint_a, ASN1_STRING_get0_data(b->hashed_msg), len_a) == 0;
617 err:
618 if (!ret)
619 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
620 return ret;
621}
622
623static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
624{
625 const ASN1_INTEGER *b = tst_info->nonce;
626
627 if (!b) {
628 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
629 return 0;
630 }
631
632 /* No error if a nonce is returned without being requested. */
633 if (ASN1_INTEGER_cmp(a, b) != 0) {
634 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
635 return 0;
636 }
637
638 return 1;
639}
640
641/*
642 * Check if the specified TSA name matches either the subject or one of the
643 * subject alternative names of the TSA certificate.
644 */
645static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
646{
647 STACK_OF(GENERAL_NAME) *gen_names = NULL;
648 int idx = -1;
649 int found = 0;
650
651 if (tsa_name->type == GEN_DIRNAME
652 && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0)
653 return 1;
654 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
655 while (gen_names != NULL) {
656 found = ts_find_name(gen_names, tsa_name) >= 0;
657 if (found)
658 break;
659 /*
660 * Get the next subject alternative name, although there should be no
661 * more than one.
662 */
663 GENERAL_NAMES_free(gen_names);
664 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
665 }
666 GENERAL_NAMES_free(gen_names);
667
668 return found;
669}
670
671/* Returns 1 if name is in gen_names, 0 otherwise. */
672static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
673{
674 int i, found;
675 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) {
676 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
677 found = GENERAL_NAME_cmp(current, name) == 0;
678 }
679 return found ? i - 1 : -1;
680}
681