source: EcnlProtoTool/trunk/openssl-1.1.0e/crypto/ts/ts_rsp_verify.c@ 331

Last change on this file since 331 was 331, checked in by coas-nagasima, 6 years ago

prototoolに関連するプロジェクトをnewlibからmuslを使うよう変更・更新
ntshellをnewlibの下位の実装から、muslのsyscallの実装に変更・更新
以下のOSSをアップデート
・mruby-1.3.0
・musl-1.1.18
・onigmo-6.1.3
・tcc-0.9.27
以下のOSSを追加
・openssl-1.1.0e
・curl-7.57.0
・zlib-1.2.11
以下のmrbgemsを追加
・iij/mruby-digest
・iij/mruby-env
・iij/mruby-errno
・iij/mruby-iijson
・iij/mruby-ipaddr
・iij/mruby-mock
・iij/mruby-require
・iij/mruby-tls-openssl
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc
File size: 19.6 KB
Line 
1/*
2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
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_lcl.h"
16
17static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
18 X509 *signer, STACK_OF(X509) **chain);
19static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
20 STACK_OF(X509) *chain);
21static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si);
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);
40
41/*
42 * This must be large enough to hold all values in ts_status_text (with
43 * comma separator) or all text fields in ts_failure_info (also with comma).
44 */
45#define TS_STATUS_BUF_SIZE 256
46
47/*
48 * Local mapping between response codes and descriptions.
49 */
50static const char *ts_status_text[] = {
51 "granted",
52 "grantedWithMods",
53 "rejection",
54 "waiting",
55 "revocationWarning",
56 "revocationNotification"
57};
58
59#define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text)
60
61static struct {
62 int code;
63 const char *text;
64} ts_failure_info[] = {
65 {TS_INFO_BAD_ALG, "badAlg"},
66 {TS_INFO_BAD_REQUEST, "badRequest"},
67 {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"},
68 {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"},
69 {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"},
70 {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"},
71 {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"},
72 {TS_INFO_SYSTEM_FAILURE, "systemFailure"}
73};
74
75
76/*-
77 * This function carries out the following tasks:
78 * - Checks if there is one and only one signer.
79 * - Search for the signing certificate in 'certs' and in the response.
80 * - Check the extended key usage and key usage fields of the signer
81 * certificate (done by the path validation).
82 * - Build and validate the certificate path.
83 * - Check if the certificate path meets the requirements of the
84 * SigningCertificate ESS signed attribute.
85 * - Verify the signature value.
86 * - Returns the signer certificate in 'signer', if 'signer' is not NULL.
87 */
88int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
89 X509_STORE *store, X509 **signer_out)
90{
91 STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL;
92 PKCS7_SIGNER_INFO *si;
93 STACK_OF(X509) *signers = NULL;
94 X509 *signer;
95 STACK_OF(X509) *chain = NULL;
96 char buf[4096];
97 int i, j = 0, ret = 0;
98 BIO *p7bio = NULL;
99
100 /* Some sanity checks first. */
101 if (!token) {
102 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER);
103 goto err;
104 }
105 if (!PKCS7_type_is_signed(token)) {
106 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE);
107 goto err;
108 }
109 sinfos = PKCS7_get_signer_info(token);
110 if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) {
111 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER);
112 goto err;
113 }
114 si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
115 if (PKCS7_get_detached(token)) {
116 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT);
117 goto err;
118 }
119
120 /*
121 * Get hold of the signer certificate, search only internal certificates
122 * if it was requested.
123 */
124 signers = PKCS7_get0_signers(token, certs, 0);
125 if (!signers || sk_X509_num(signers) != 1)
126 goto err;
127 signer = sk_X509_value(signers, 0);
128
129 if (!ts_verify_cert(store, certs, signer, &chain))
130 goto err;
131 if (!ts_check_signing_certs(si, chain))
132 goto err;
133 p7bio = PKCS7_dataInit(token, NULL);
134
135 /* We now have to 'read' from p7bio to calculate digests etc. */
136 while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0)
137 continue;
138
139 j = PKCS7_signatureVerify(p7bio, token, si, signer);
140 if (j <= 0) {
141 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE);
142 goto err;
143 }
144
145 if (signer_out) {
146 *signer_out = signer;
147 X509_up_ref(signer);
148 }
149 ret = 1;
150
151 err:
152 BIO_free_all(p7bio);
153 sk_X509_pop_free(chain, X509_free);
154 sk_X509_free(signers);
155
156 return ret;
157}
158
159/*
160 * The certificate chain is returned in chain. Caller is responsible for
161 * freeing the vector.
162 */
163static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
164 X509 *signer, STACK_OF(X509) **chain)
165{
166 X509_STORE_CTX *cert_ctx = NULL;
167 int i;
168 int ret = 0;
169
170 *chain = NULL;
171 cert_ctx = X509_STORE_CTX_new();
172 if (cert_ctx == NULL) {
173 TSerr(TS_F_TS_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
174 goto err;
175 }
176 if (!X509_STORE_CTX_init(cert_ctx, store, signer, untrusted))
177 goto end;
178 X509_STORE_CTX_set_purpose(cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
179 i = X509_verify_cert(cert_ctx);
180 if (i <= 0) {
181 int j = X509_STORE_CTX_get_error(cert_ctx);
182 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
183 ERR_add_error_data(2, "Verify error:",
184 X509_verify_cert_error_string(j));
185 goto err;
186 }
187 *chain = X509_STORE_CTX_get1_chain(cert_ctx);
188 ret = 1;
189 goto end;
190
191err:
192 ret = 0;
193
194end:
195 X509_STORE_CTX_free(cert_ctx);
196 return ret;
197}
198
199static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
200 STACK_OF(X509) *chain)
201{
202 ESS_SIGNING_CERT *ss = ess_get_signing_cert(si);
203 STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
204 X509 *cert;
205 int i = 0;
206 int ret = 0;
207
208 if (!ss)
209 goto err;
210 cert_ids = ss->cert_ids;
211 cert = sk_X509_value(chain, 0);
212 if (ts_find_cert(cert_ids, cert) != 0)
213 goto err;
214
215 /*
216 * Check the other certificates of the chain if there are more than one
217 * certificate ids in cert_ids.
218 */
219 if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
220 for (i = 1; i < sk_X509_num(chain); ++i) {
221 cert = sk_X509_value(chain, i);
222 if (ts_find_cert(cert_ids, cert) < 0)
223 goto err;
224 }
225 }
226 ret = 1;
227 err:
228 if (!ret)
229 TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
230 TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
231 ESS_SIGNING_CERT_free(ss);
232 return ret;
233}
234
235static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si)
236{
237 ASN1_TYPE *attr;
238 const unsigned char *p;
239 attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate);
240 if (!attr)
241 return NULL;
242 p = attr->value.sequence->data;
243 return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
244}
245
246/* Returns < 0 if certificate is not found, certificate index otherwise. */
247static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
248{
249 int i;
250 unsigned char cert_sha1[SHA_DIGEST_LENGTH];
251
252 if (!cert_ids || !cert)
253 return -1;
254
255 X509_digest(cert, EVP_sha1(), cert_sha1, NULL);
256
257 /* Recompute SHA1 hash of certificate if necessary (side effect). */
258 X509_check_purpose(cert, -1, 0);
259
260 /* Look for cert in the cert_ids vector. */
261 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
262 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
263
264 if (cid->hash->length == SHA_DIGEST_LENGTH
265 && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) {
266 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
267 if (!is || !ts_issuer_serial_cmp(is, cert))
268 return i;
269 }
270 }
271
272 return -1;
273}
274
275static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert)
276{
277 GENERAL_NAME *issuer;
278
279 if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1)
280 return -1;
281
282 issuer = sk_GENERAL_NAME_value(is->issuer, 0);
283 if (issuer->type != GEN_DIRNAME
284 || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert)))
285 return -1;
286
287 if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert)))
288 return -1;
289
290 return 0;
291}
292
293/*-
294 * Verifies whether 'response' contains a valid response with regards
295 * to the settings of the context:
296 * - Gives an error message if the TS_TST_INFO is not present.
297 * - Calls _TS_RESP_verify_token to verify the token content.
298 */
299int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
300{
301 PKCS7 *token = response->token;
302 TS_TST_INFO *tst_info = response->tst_info;
303 int ret = 0;
304
305 if (!ts_check_status_info(response))
306 goto err;
307 if (!int_ts_RESP_verify_token(ctx, token, tst_info))
308 goto err;
309 ret = 1;
310
311 err:
312 return ret;
313}
314
315/*
316 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
317 * calls the internal int_TS_RESP_verify_token function for verifying it.
318 */
319int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
320{
321 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
322 int ret = 0;
323 if (tst_info) {
324 ret = int_ts_RESP_verify_token(ctx, token, tst_info);
325 TS_TST_INFO_free(tst_info);
326 }
327 return ret;
328}
329
330/*-
331 * Verifies whether the 'token' contains a valid time stamp token
332 * with regards to the settings of the context. Only those checks are
333 * carried out that are specified in the context:
334 * - Verifies the signature of the TS_TST_INFO.
335 * - Checks the version number of the response.
336 * - Check if the requested and returned policies math.
337 * - Check if the message imprints are the same.
338 * - Check if the nonces are the same.
339 * - Check if the TSA name matches the signer.
340 * - Check if the TSA name is the expected TSA.
341 */
342static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
343 PKCS7 *token, TS_TST_INFO *tst_info)
344{
345 X509 *signer = NULL;
346 GENERAL_NAME *tsa_name = tst_info->tsa;
347 X509_ALGOR *md_alg = NULL;
348 unsigned char *imprint = NULL;
349 unsigned imprint_len = 0;
350 int ret = 0;
351 int flags = ctx->flags;
352
353 /* Some options require us to also check the signature */
354 if (((flags & TS_VFY_SIGNER) && tsa_name != NULL)
355 || (flags & TS_VFY_TSA_NAME)) {
356 flags |= TS_VFY_SIGNATURE;
357 }
358
359 if ((flags & TS_VFY_SIGNATURE)
360 && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
361 goto err;
362 if ((flags & TS_VFY_VERSION)
363 && TS_TST_INFO_get_version(tst_info) != 1) {
364 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
365 goto err;
366 }
367 if ((flags & TS_VFY_POLICY)
368 && !ts_check_policy(ctx->policy, tst_info))
369 goto err;
370 if ((flags & TS_VFY_IMPRINT)
371 && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
372 tst_info))
373 goto err;
374 if ((flags & TS_VFY_DATA)
375 && (!ts_compute_imprint(ctx->data, tst_info,
376 &md_alg, &imprint, &imprint_len)
377 || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info)))
378 goto err;
379 if ((flags & TS_VFY_NONCE)
380 && !ts_check_nonces(ctx->nonce, tst_info))
381 goto err;
382 if ((flags & TS_VFY_SIGNER)
383 && tsa_name && !ts_check_signer_name(tsa_name, signer)) {
384 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
385 goto err;
386 }
387 if ((flags & TS_VFY_TSA_NAME)
388 && !ts_check_signer_name(ctx->tsa_name, signer)) {
389 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
390 goto err;
391 }
392 ret = 1;
393
394 err:
395 X509_free(signer);
396 X509_ALGOR_free(md_alg);
397 OPENSSL_free(imprint);
398 return ret;
399}
400
401static int ts_check_status_info(TS_RESP *response)
402{
403 TS_STATUS_INFO *info = response->status_info;
404 long status = ASN1_INTEGER_get(info->status);
405 const char *status_text = NULL;
406 char *embedded_status_text = NULL;
407 char failure_text[TS_STATUS_BUF_SIZE] = "";
408
409 if (status == 0 || status == 1)
410 return 1;
411
412 /* There was an error, get the description in status_text. */
413 if (0 <= status && status < (long) OSSL_NELEM(ts_status_text))
414 status_text = ts_status_text[status];
415 else
416 status_text = "unknown code";
417
418 if (sk_ASN1_UTF8STRING_num(info->text) > 0
419 && (embedded_status_text = ts_get_status_text(info->text)) == NULL)
420 return 0;
421
422 /* Fill in failure_text with the failure information. */
423 if (info->failure_info) {
424 int i;
425 int first = 1;
426 for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) {
427 if (ASN1_BIT_STRING_get_bit(info->failure_info,
428 ts_failure_info[i].code)) {
429 if (!first)
430 strcat(failure_text, ",");
431 else
432 first = 0;
433 strcat(failure_text, ts_failure_info[i].text);
434 }
435 }
436 }
437 if (failure_text[0] == '\0')
438 strcpy(failure_text, "unspecified");
439
440 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
441 ERR_add_error_data(6,
442 "status code: ", status_text,
443 ", status text: ", embedded_status_text ?
444 embedded_status_text : "unspecified",
445 ", failure codes: ", failure_text);
446 OPENSSL_free(embedded_status_text);
447
448 return 0;
449}
450
451static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
452{
453 int i;
454 int length = 0;
455 char *result = NULL;
456 char *p;
457
458 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
459 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
460 if (ASN1_STRING_length(current) > TS_MAX_STATUS_LENGTH - length - 1)
461 return NULL;
462 length += ASN1_STRING_length(current);
463 length += 1; /* separator character */
464 }
465 if ((result = OPENSSL_malloc(length)) == NULL) {
466 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
467 return NULL;
468 }
469
470 for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) {
471 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
472 length = ASN1_STRING_length(current);
473 if (i > 0)
474 *p++ = '/';
475 strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
476 p += length;
477 }
478 *p = '\0';
479
480 return result;
481}
482
483static int ts_check_policy(const ASN1_OBJECT *req_oid,
484 const TS_TST_INFO *tst_info)
485{
486 const ASN1_OBJECT *resp_oid = tst_info->policy_id;
487
488 if (OBJ_cmp(req_oid, resp_oid) != 0) {
489 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
490 return 0;
491 }
492
493 return 1;
494}
495
496static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
497 X509_ALGOR **md_alg,
498 unsigned char **imprint, unsigned *imprint_len)
499{
500 TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint;
501 X509_ALGOR *md_alg_resp = msg_imprint->hash_algo;
502 const EVP_MD *md;
503 EVP_MD_CTX *md_ctx = NULL;
504 unsigned char buffer[4096];
505 int length;
506
507 *md_alg = NULL;
508 *imprint = NULL;
509
510 if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL)
511 goto err;
512 if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) {
513 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
514 goto err;
515 }
516 length = EVP_MD_size(md);
517 if (length < 0)
518 goto err;
519 *imprint_len = length;
520 if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) {
521 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
522 goto err;
523 }
524
525 md_ctx = EVP_MD_CTX_new();
526 if (md_ctx == NULL) {
527 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
528 goto err;
529 }
530 if (!EVP_DigestInit(md_ctx, md))
531 goto err;
532 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
533 if (!EVP_DigestUpdate(md_ctx, buffer, length))
534 goto err;
535 }
536 if (!EVP_DigestFinal(md_ctx, *imprint, NULL))
537 goto err;
538 EVP_MD_CTX_free(md_ctx);
539
540 return 1;
541 err:
542 EVP_MD_CTX_free(md_ctx);
543 X509_ALGOR_free(*md_alg);
544 OPENSSL_free(*imprint);
545 *imprint_len = 0;
546 *imprint = 0;
547 return 0;
548}
549
550static int ts_check_imprints(X509_ALGOR *algor_a,
551 const unsigned char *imprint_a, unsigned len_a,
552 TS_TST_INFO *tst_info)
553{
554 TS_MSG_IMPRINT *b = tst_info->msg_imprint;
555 X509_ALGOR *algor_b = b->hash_algo;
556 int ret = 0;
557
558 if (algor_a) {
559 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
560 goto err;
561
562 /* The parameter must be NULL in both. */
563 if ((algor_a->parameter
564 && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL)
565 || (algor_b->parameter
566 && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
567 goto err;
568 }
569
570 ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) &&
571 memcmp(imprint_a, ASN1_STRING_get0_data(b->hashed_msg), len_a) == 0;
572 err:
573 if (!ret)
574 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
575 return ret;
576}
577
578static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
579{
580 const ASN1_INTEGER *b = tst_info->nonce;
581
582 if (!b) {
583 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
584 return 0;
585 }
586
587 /* No error if a nonce is returned without being requested. */
588 if (ASN1_INTEGER_cmp(a, b) != 0) {
589 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
590 return 0;
591 }
592
593 return 1;
594}
595
596/*
597 * Check if the specified TSA name matches either the subject or one of the
598 * subject alternative names of the TSA certificate.
599 */
600static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
601{
602 STACK_OF(GENERAL_NAME) *gen_names = NULL;
603 int idx = -1;
604 int found = 0;
605
606 if (tsa_name->type == GEN_DIRNAME
607 && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0)
608 return 1;
609 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
610 while (gen_names != NULL) {
611 found = ts_find_name(gen_names, tsa_name) >= 0;
612 if (found)
613 break;
614 /*
615 * Get the next subject alternative name, although there should be no
616 * more than one.
617 */
618 GENERAL_NAMES_free(gen_names);
619 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
620 }
621 GENERAL_NAMES_free(gen_names);
622
623 return found;
624}
625
626/* Returns 1 if name is in gen_names, 0 otherwise. */
627static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
628{
629 int i, found;
630 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) {
631 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
632 found = GENERAL_NAME_cmp(current, name) == 0;
633 }
634 return found ? i - 1 : -1;
635}
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