1 /* crypto/ts/ts_resp_verify.c */
3 * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
61 #include "internal/cryptlib.h"
62 #include <openssl/objects.h>
63 #include <openssl/ts.h>
64 #include <openssl/pkcs7.h>
67 /* Private function declarations. */
69 static int ts_verify_cert(X509_STORE
*store
, STACK_OF(X509
) *untrusted
,
70 X509
*signer
, STACK_OF(X509
) **chain
);
71 static int ts_check_signing_certs(PKCS7_SIGNER_INFO
*si
,
72 STACK_OF(X509
) *chain
);
73 static ESS_SIGNING_CERT
*ess_get_signing_cert(PKCS7_SIGNER_INFO
*si
);
74 static int ts_find_cert(STACK_OF(ESS_CERT_ID
) *cert_ids
, X509
*cert
);
75 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL
*is
, X509
*cert
);
76 static int int_ts_RESP_verify_token(TS_VERIFY_CTX
*ctx
,
77 PKCS7
*token
, TS_TST_INFO
*tst_info
);
78 static int ts_check_status_info(TS_RESP
*response
);
79 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING
) *text
);
80 static int ts_check_policy(ASN1_OBJECT
*req_oid
, TS_TST_INFO
*tst_info
);
81 static int ts_compute_imprint(BIO
*data
, TS_TST_INFO
*tst_info
,
83 unsigned char **imprint
, unsigned *imprint_len
);
84 static int ts_check_imprints(X509_ALGOR
*algor_a
,
85 unsigned char *imprint_a
, unsigned len_a
,
86 TS_TST_INFO
*tst_info
);
87 static int ts_check_nonces(const ASN1_INTEGER
*a
, TS_TST_INFO
*tst_info
);
88 static int ts_check_signer_name(GENERAL_NAME
*tsa_name
, X509
*signer
);
89 static int ts_find_name(STACK_OF(GENERAL_NAME
) *gen_names
,
93 * Local mapping between response codes and descriptions.
94 * Don't forget to change TS_STATUS_BUF_SIZE when modifying
95 * the elements of this array.
97 static const char *ts_status_text
[] = { "granted",
102 "revocationNotification"
105 #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text)
108 * This must be greater or equal to the sum of the strings in TS_status_text
109 * plus the number of its elements.
111 #define TS_STATUS_BUF_SIZE 256
116 } ts_failure_info
[] = {
117 {TS_INFO_BAD_ALG
, "badAlg"},
118 {TS_INFO_BAD_REQUEST
, "badRequest"},
119 {TS_INFO_BAD_DATA_FORMAT
, "badDataFormat"},
120 {TS_INFO_TIME_NOT_AVAILABLE
, "timeNotAvailable"},
121 {TS_INFO_UNACCEPTED_POLICY
, "unacceptedPolicy"},
122 {TS_INFO_UNACCEPTED_EXTENSION
, "unacceptedExtension"},
123 {TS_INFO_ADD_INFO_NOT_AVAILABLE
, "addInfoNotAvailable"},
124 {TS_INFO_SYSTEM_FAILURE
, "systemFailure"}
127 #define TS_FAILURE_INFO_SIZE OSSL_NELEM(ts_failure_info)
129 /* Functions for verifying a signed TS_TST_INFO structure. */
132 * This function carries out the following tasks:
133 * - Checks if there is one and only one signer.
134 * - Search for the signing certificate in 'certs' and in the response.
135 * - Check the extended key usage and key usage fields of the signer
136 * certificate (done by the path validation).
137 * - Build and validate the certificate path.
138 * - Check if the certificate path meets the requirements of the
139 * SigningCertificate ESS signed attribute.
140 * - Verify the signature value.
141 * - Returns the signer certificate in 'signer', if 'signer' is not NULL.
143 int TS_RESP_verify_signature(PKCS7
*token
, STACK_OF(X509
) *certs
,
144 X509_STORE
*store
, X509
**signer_out
)
146 STACK_OF(PKCS7_SIGNER_INFO
) *sinfos
= NULL
;
147 PKCS7_SIGNER_INFO
*si
;
148 STACK_OF(X509
) *signers
= NULL
;
150 STACK_OF(X509
) *chain
= NULL
;
152 int i
, j
= 0, ret
= 0;
155 /* Some sanity checks first. */
157 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE
, TS_R_INVALID_NULL_POINTER
);
161 /* Check for the correct content type */
162 if (!PKCS7_type_is_signed(token
)) {
163 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE
, TS_R_WRONG_CONTENT_TYPE
);
167 /* Check if there is one and only one signer. */
168 sinfos
= PKCS7_get_signer_info(token
);
169 if (!sinfos
|| sk_PKCS7_SIGNER_INFO_num(sinfos
) != 1) {
170 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE
, TS_R_THERE_MUST_BE_ONE_SIGNER
);
173 si
= sk_PKCS7_SIGNER_INFO_value(sinfos
, 0);
175 /* Check for no content: no data to verify signature. */
176 if (PKCS7_get_detached(token
)) {
177 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE
, TS_R_NO_CONTENT
);
182 * Get hold of the signer certificate, search only internal certificates
183 * if it was requested.
185 signers
= PKCS7_get0_signers(token
, certs
, 0);
186 if (!signers
|| sk_X509_num(signers
) != 1)
188 signer
= sk_X509_value(signers
, 0);
190 /* Now verify the certificate. */
191 if (!ts_verify_cert(store
, certs
, signer
, &chain
))
195 * Check if the signer certificate is consistent with the ESS extension.
197 if (!ts_check_signing_certs(si
, chain
))
200 /* Creating the message digest. */
201 p7bio
= PKCS7_dataInit(token
, NULL
);
203 /* We now have to 'read' from p7bio to calculate digests etc. */
204 while ((i
= BIO_read(p7bio
, buf
, sizeof(buf
))) > 0) ;
206 /* Verifying the signature. */
207 j
= PKCS7_signatureVerify(p7bio
, token
, si
, signer
);
209 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE
, TS_R_SIGNATURE_FAILURE
);
213 /* Return the signer certificate if needed. */
215 *signer_out
= signer
;
223 sk_X509_pop_free(chain
, X509_free
);
224 sk_X509_free(signers
);
230 * The certificate chain is returned in chain. Caller is responsible for
231 * freeing the vector.
233 static int ts_verify_cert(X509_STORE
*store
, STACK_OF(X509
) *untrusted
,
234 X509
*signer
, STACK_OF(X509
) **chain
)
236 X509_STORE_CTX cert_ctx
;
240 /* chain is an out argument. */
242 X509_STORE_CTX_init(&cert_ctx
, store
, signer
, untrusted
);
243 X509_STORE_CTX_set_purpose(&cert_ctx
, X509_PURPOSE_TIMESTAMP_SIGN
);
244 i
= X509_verify_cert(&cert_ctx
);
246 int j
= X509_STORE_CTX_get_error(&cert_ctx
);
247 TSerr(TS_F_TS_VERIFY_CERT
, TS_R_CERTIFICATE_VERIFY_ERROR
);
248 ERR_add_error_data(2, "Verify error:",
249 X509_verify_cert_error_string(j
));
252 /* Get a copy of the certificate chain. */
253 *chain
= X509_STORE_CTX_get1_chain(&cert_ctx
);
256 X509_STORE_CTX_cleanup(&cert_ctx
);
261 static int ts_check_signing_certs(PKCS7_SIGNER_INFO
*si
,
262 STACK_OF(X509
) *chain
)
264 ESS_SIGNING_CERT
*ss
= ess_get_signing_cert(si
);
265 STACK_OF(ESS_CERT_ID
) *cert_ids
= NULL
;
272 cert_ids
= ss
->cert_ids
;
273 /* The signer certificate must be the first in cert_ids. */
274 cert
= sk_X509_value(chain
, 0);
275 if (ts_find_cert(cert_ids
, cert
) != 0)
279 * Check the other certificates of the chain if there are more than one
280 * certificate ids in cert_ids.
282 if (sk_ESS_CERT_ID_num(cert_ids
) > 1) {
283 /* All the certificates of the chain must be in cert_ids. */
284 for (i
= 1; i
< sk_X509_num(chain
); ++i
) {
285 cert
= sk_X509_value(chain
, i
);
286 if (ts_find_cert(cert_ids
, cert
) < 0)
293 TSerr(TS_F_TS_CHECK_SIGNING_CERTS
,
294 TS_R_ESS_SIGNING_CERTIFICATE_ERROR
);
295 ESS_SIGNING_CERT_free(ss
);
299 static ESS_SIGNING_CERT
*ess_get_signing_cert(PKCS7_SIGNER_INFO
*si
)
302 const unsigned char *p
;
303 attr
= PKCS7_get_signed_attribute(si
, NID_id_smime_aa_signingCertificate
);
306 p
= attr
->value
.sequence
->data
;
307 return d2i_ESS_SIGNING_CERT(NULL
, &p
, attr
->value
.sequence
->length
);
310 /* Returns < 0 if certificate is not found, certificate index otherwise. */
311 static int ts_find_cert(STACK_OF(ESS_CERT_ID
) *cert_ids
, X509
*cert
)
315 if (!cert_ids
|| !cert
)
318 /* Recompute SHA1 hash of certificate if necessary (side effect). */
319 X509_check_purpose(cert
, -1, 0);
321 /* Look for cert in the cert_ids vector. */
322 for (i
= 0; i
< sk_ESS_CERT_ID_num(cert_ids
); ++i
) {
323 ESS_CERT_ID
*cid
= sk_ESS_CERT_ID_value(cert_ids
, i
);
325 /* Check the SHA-1 hash first. */
326 if (cid
->hash
->length
== sizeof(cert
->sha1_hash
)
327 && !memcmp(cid
->hash
->data
, cert
->sha1_hash
,
328 sizeof(cert
->sha1_hash
))) {
329 /* Check the issuer/serial as well if specified. */
330 ESS_ISSUER_SERIAL
*is
= cid
->issuer_serial
;
331 if (!is
|| !ts_issuer_serial_cmp(is
, cert
))
339 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL
*is
, X509
*cert
)
341 GENERAL_NAME
*issuer
;
343 if (!is
|| !cert
|| sk_GENERAL_NAME_num(is
->issuer
) != 1)
346 /* Check the issuer first. It must be a directory name. */
347 issuer
= sk_GENERAL_NAME_value(is
->issuer
, 0);
348 if (issuer
->type
!= GEN_DIRNAME
349 || X509_NAME_cmp(issuer
->d
.dirn
, X509_get_issuer_name(cert
)))
352 /* Check the serial number, too. */
353 if (ASN1_INTEGER_cmp(is
->serial
, X509_get_serialNumber(cert
)))
360 * Verifies whether 'response' contains a valid response with regards
361 * to the settings of the context:
362 * - Gives an error message if the TS_TST_INFO is not present.
363 * - Calls _TS_RESP_verify_token to verify the token content.
365 int TS_RESP_verify_response(TS_VERIFY_CTX
*ctx
, TS_RESP
*response
)
367 PKCS7
*token
= response
->token
;
368 TS_TST_INFO
*tst_info
= response
->tst_info
;
371 /* Check if we have a successful TS_TST_INFO object in place. */
372 if (!ts_check_status_info(response
))
375 /* Check the contents of the time stamp token. */
376 if (!int_ts_RESP_verify_token(ctx
, token
, tst_info
))
385 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
386 * calls the internal int_TS_RESP_verify_token function for verifying it.
388 int TS_RESP_verify_token(TS_VERIFY_CTX
*ctx
, PKCS7
*token
)
390 TS_TST_INFO
*tst_info
= PKCS7_to_TS_TST_INFO(token
);
393 ret
= int_ts_RESP_verify_token(ctx
, token
, tst_info
);
394 TS_TST_INFO_free(tst_info
);
400 * Verifies whether the 'token' contains a valid time stamp token
401 * with regards to the settings of the context. Only those checks are
402 * carried out that are specified in the context:
403 * - Verifies the signature of the TS_TST_INFO.
404 * - Checks the version number of the response.
405 * - Check if the requested and returned policies math.
406 * - Check if the message imprints are the same.
407 * - Check if the nonces are the same.
408 * - Check if the TSA name matches the signer.
409 * - Check if the TSA name is the expected TSA.
411 static int int_ts_RESP_verify_token(TS_VERIFY_CTX
*ctx
,
412 PKCS7
*token
, TS_TST_INFO
*tst_info
)
415 GENERAL_NAME
*tsa_name
= tst_info
->tsa
;
416 X509_ALGOR
*md_alg
= NULL
;
417 unsigned char *imprint
= NULL
;
418 unsigned imprint_len
= 0;
421 /* Verify the signature. */
422 if ((ctx
->flags
& TS_VFY_SIGNATURE
)
423 && !TS_RESP_verify_signature(token
, ctx
->certs
, ctx
->store
, &signer
))
426 /* Check version number of response. */
427 if ((ctx
->flags
& TS_VFY_VERSION
)
428 && TS_TST_INFO_get_version(tst_info
) != 1) {
429 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN
, TS_R_UNSUPPORTED_VERSION
);
433 /* Check policies. */
434 if ((ctx
->flags
& TS_VFY_POLICY
)
435 && !ts_check_policy(ctx
->policy
, tst_info
))
438 /* Check message imprints. */
439 if ((ctx
->flags
& TS_VFY_IMPRINT
)
440 && !ts_check_imprints(ctx
->md_alg
, ctx
->imprint
, ctx
->imprint_len
,
444 /* Compute and check message imprints. */
445 if ((ctx
->flags
& TS_VFY_DATA
)
446 && (!ts_compute_imprint(ctx
->data
, tst_info
,
447 &md_alg
, &imprint
, &imprint_len
)
448 || !ts_check_imprints(md_alg
, imprint
, imprint_len
, tst_info
)))
452 if ((ctx
->flags
& TS_VFY_NONCE
)
453 && !ts_check_nonces(ctx
->nonce
, tst_info
))
456 /* Check whether TSA name and signer certificate match. */
457 if ((ctx
->flags
& TS_VFY_SIGNER
)
458 && tsa_name
&& !ts_check_signer_name(tsa_name
, signer
)) {
459 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN
, TS_R_TSA_NAME_MISMATCH
);
463 /* Check whether the TSA is the expected one. */
464 if ((ctx
->flags
& TS_VFY_TSA_NAME
)
465 && !ts_check_signer_name(ctx
->tsa_name
, signer
)) {
466 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN
, TS_R_TSA_UNTRUSTED
);
473 X509_ALGOR_free(md_alg
);
474 OPENSSL_free(imprint
);
478 static int ts_check_status_info(TS_RESP
*response
)
480 TS_STATUS_INFO
*info
= response
->status_info
;
481 long status
= ASN1_INTEGER_get(info
->status
);
482 const char *status_text
= NULL
;
483 char *embedded_status_text
= NULL
;
484 char failure_text
[TS_STATUS_BUF_SIZE
] = "";
486 /* Check if everything went fine. */
487 if (status
== 0 || status
== 1)
490 /* There was an error, get the description in status_text. */
491 if (0 <= status
&& status
< (long)TS_STATUS_TEXT_SIZE
)
492 status_text
= ts_status_text
[status
];
494 status_text
= "unknown code";
496 /* Set the embedded_status_text to the returned description. */
497 if (sk_ASN1_UTF8STRING_num(info
->text
) > 0
498 && (embedded_status_text
= ts_get_status_text(info
->text
)) == NULL
)
501 /* Filling in failure_text with the failure information. */
502 if (info
->failure_info
) {
505 for (i
= 0; i
< (int)TS_FAILURE_INFO_SIZE
; ++i
) {
506 if (ASN1_BIT_STRING_get_bit(info
->failure_info
,
507 ts_failure_info
[i
].code
)) {
509 strcpy(failure_text
, ",");
512 strcat(failure_text
, ts_failure_info
[i
].text
);
516 if (failure_text
[0] == '\0')
517 strcpy(failure_text
, "unspecified");
519 /* Making up the error string. */
520 TSerr(TS_F_TS_CHECK_STATUS_INFO
, TS_R_NO_TIME_STAMP_TOKEN
);
521 ERR_add_error_data(6,
522 "status code: ", status_text
,
523 ", status text: ", embedded_status_text
?
524 embedded_status_text
: "unspecified",
525 ", failure codes: ", failure_text
);
526 OPENSSL_free(embedded_status_text
);
531 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING
) *text
)
534 unsigned int length
= 0;
538 /* Determine length first. */
539 for (i
= 0; i
< sk_ASN1_UTF8STRING_num(text
); ++i
) {
540 ASN1_UTF8STRING
*current
= sk_ASN1_UTF8STRING_value(text
, i
);
541 length
+= ASN1_STRING_length(current
);
542 length
+= 1; /* separator character */
544 /* Allocate memory (closing '\0' included). */
545 if ((result
= OPENSSL_malloc(length
)) == NULL
) {
546 TSerr(TS_F_TS_GET_STATUS_TEXT
, ERR_R_MALLOC_FAILURE
);
549 /* Concatenate the descriptions. */
550 for (i
= 0, p
= result
; i
< sk_ASN1_UTF8STRING_num(text
); ++i
) {
551 ASN1_UTF8STRING
*current
= sk_ASN1_UTF8STRING_value(text
, i
);
552 length
= ASN1_STRING_length(current
);
555 strncpy(p
, (const char *)ASN1_STRING_data(current
), length
);
558 /* We do have space for this, too. */
564 static int ts_check_policy(ASN1_OBJECT
*req_oid
, TS_TST_INFO
*tst_info
)
566 ASN1_OBJECT
*resp_oid
= tst_info
->policy_id
;
568 if (OBJ_cmp(req_oid
, resp_oid
) != 0) {
569 TSerr(TS_F_TS_CHECK_POLICY
, TS_R_POLICY_MISMATCH
);
576 static int ts_compute_imprint(BIO
*data
, TS_TST_INFO
*tst_info
,
578 unsigned char **imprint
, unsigned *imprint_len
)
580 TS_MSG_IMPRINT
*msg_imprint
= tst_info
->msg_imprint
;
581 X509_ALGOR
*md_alg_resp
= msg_imprint
->hash_algo
;
584 unsigned char buffer
[4096];
590 /* Return the MD algorithm of the response. */
591 if ((*md_alg
= X509_ALGOR_dup(md_alg_resp
)) == NULL
)
594 /* Getting the MD object. */
595 if ((md
= EVP_get_digestbyobj((*md_alg
)->algorithm
)) == NULL
) {
596 TSerr(TS_F_TS_COMPUTE_IMPRINT
, TS_R_UNSUPPORTED_MD_ALGORITHM
);
600 /* Compute message digest. */
601 length
= EVP_MD_size(md
);
604 *imprint_len
= length
;
605 if ((*imprint
= OPENSSL_malloc(*imprint_len
)) == NULL
) {
606 TSerr(TS_F_TS_COMPUTE_IMPRINT
, ERR_R_MALLOC_FAILURE
);
610 if (!EVP_DigestInit(&md_ctx
, md
))
612 while ((length
= BIO_read(data
, buffer
, sizeof(buffer
))) > 0) {
613 if (!EVP_DigestUpdate(&md_ctx
, buffer
, length
))
616 if (!EVP_DigestFinal(&md_ctx
, *imprint
, NULL
))
621 X509_ALGOR_free(*md_alg
);
622 OPENSSL_free(*imprint
);
628 static int ts_check_imprints(X509_ALGOR
*algor_a
,
629 unsigned char *imprint_a
, unsigned len_a
,
630 TS_TST_INFO
*tst_info
)
632 TS_MSG_IMPRINT
*b
= tst_info
->msg_imprint
;
633 X509_ALGOR
*algor_b
= b
->hash_algo
;
636 /* algor_a is optional. */
638 /* Compare algorithm OIDs. */
639 if (OBJ_cmp(algor_a
->algorithm
, algor_b
->algorithm
))
642 /* The parameter must be NULL in both. */
643 if ((algor_a
->parameter
644 && ASN1_TYPE_get(algor_a
->parameter
) != V_ASN1_NULL
)
645 || (algor_b
->parameter
646 && ASN1_TYPE_get(algor_b
->parameter
) != V_ASN1_NULL
))
650 /* Compare octet strings. */
651 ret
= len_a
== (unsigned)ASN1_STRING_length(b
->hashed_msg
) &&
652 memcmp(imprint_a
, ASN1_STRING_data(b
->hashed_msg
), len_a
) == 0;
655 TSerr(TS_F_TS_CHECK_IMPRINTS
, TS_R_MESSAGE_IMPRINT_MISMATCH
);
659 static int ts_check_nonces(const ASN1_INTEGER
*a
, TS_TST_INFO
*tst_info
)
661 const ASN1_INTEGER
*b
= tst_info
->nonce
;
663 /* Error if nonce is missing. */
665 TSerr(TS_F_TS_CHECK_NONCES
, TS_R_NONCE_NOT_RETURNED
);
669 /* No error if a nonce is returned without being requested. */
670 if (ASN1_INTEGER_cmp(a
, b
) != 0) {
671 TSerr(TS_F_TS_CHECK_NONCES
, TS_R_NONCE_MISMATCH
);
679 * Check if the specified TSA name matches either the subject or one of the
680 * subject alternative names of the TSA certificate.
682 static int ts_check_signer_name(GENERAL_NAME
*tsa_name
, X509
*signer
)
684 STACK_OF(GENERAL_NAME
) *gen_names
= NULL
;
688 /* Check the subject name first. */
689 if (tsa_name
->type
== GEN_DIRNAME
690 && X509_name_cmp(tsa_name
->d
.dirn
, X509_get_subject_name(signer
)) == 0)
693 /* Check all the alternative names. */
694 gen_names
= X509_get_ext_d2i(signer
, NID_subject_alt_name
, NULL
, &idx
);
695 while (gen_names
!= NULL
) {
696 found
= ts_find_name(gen_names
, tsa_name
) >= 0;
700 * Get the next subject alternative name, although there should be no
703 GENERAL_NAMES_free(gen_names
);
704 gen_names
= X509_get_ext_d2i(signer
, NID_subject_alt_name
, NULL
, &idx
);
706 GENERAL_NAMES_free(gen_names
);
711 /* Returns 1 if name is in gen_names, 0 otherwise. */
712 static int ts_find_name(STACK_OF(GENERAL_NAME
) *gen_names
, GENERAL_NAME
*name
)
715 for (i
= 0, found
= 0; !found
&& i
< sk_GENERAL_NAME_num(gen_names
); ++i
) {
716 GENERAL_NAME
*current
= sk_GENERAL_NAME_value(gen_names
, i
);
717 found
= GENERAL_NAME_cmp(current
, name
) == 0;
719 return found
? i
- 1 : -1;