summaryrefslogtreecommitdiff
path: root/src/lib/libcrypto/ts/ts_rsp_verify.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/libcrypto/ts/ts_rsp_verify.c')
-rw-r--r--src/lib/libcrypto/ts/ts_rsp_verify.c734
1 files changed, 0 insertions, 734 deletions
diff --git a/src/lib/libcrypto/ts/ts_rsp_verify.c b/src/lib/libcrypto/ts/ts_rsp_verify.c
deleted file mode 100644
index 25fc22dfaf..0000000000
--- a/src/lib/libcrypto/ts/ts_rsp_verify.c
+++ /dev/null
@@ -1,734 +0,0 @@
1/* $OpenBSD: ts_rsp_verify.c,v 1.12 2014/07/11 08:44:49 jsing Exp $ */
2/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
3 * project 2002.
4 */
5/* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include <string.h>
61
62#include <openssl/err.h>
63#include <openssl/objects.h>
64#include <openssl/pkcs7.h>
65#include <openssl/ts.h>
66
67/* Private function declarations. */
68
69static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
70 X509 *signer, STACK_OF(X509) **chain);
71static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain);
72static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si);
73static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert);
74static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo);
75static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx,
76 PKCS7 *token, TS_TST_INFO *tst_info);
77static int TS_check_status_info(TS_RESP *response);
78static char *TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text);
79static int TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info);
80static int TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
81 X509_ALGOR **md_alg,
82 unsigned char **imprint, unsigned *imprint_len);
83static int TS_check_imprints(X509_ALGOR *algor_a,
84 unsigned char *imprint_a, unsigned len_a,
85 TS_TST_INFO *tst_info);
86static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info);
87static int TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer);
88static int TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name);
89
90/*
91 * Local mapping between response codes and descriptions.
92 * Don't forget to change TS_STATUS_BUF_SIZE when modifying
93 * the elements of this array.
94 */
95static const char *TS_status_text[] = {
96 "granted",
97 "grantedWithMods",
98 "rejection",
99 "waiting",
100 "revocationWarning",
101 "revocationNotification"
102};
103
104#define TS_STATUS_TEXT_SIZE (sizeof(TS_status_text)/sizeof(*TS_status_text))
105
106/*
107 * This must be greater or equal to the sum of the strings in TS_status_text
108 * plus the number of its elements.
109 */
110#define TS_STATUS_BUF_SIZE 256
111
112static struct {
113 int code;
114 const char *text;
115} TS_failure_info[] = {
116 { TS_INFO_BAD_ALG, "badAlg" },
117 { TS_INFO_BAD_REQUEST, "badRequest" },
118 { TS_INFO_BAD_DATA_FORMAT, "badDataFormat" },
119 { TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable" },
120 { TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy" },
121 { TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension" },
122 { TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable" },
123 { TS_INFO_SYSTEM_FAILURE, "systemFailure" }
124};
125
126#define TS_FAILURE_INFO_SIZE (sizeof(TS_failure_info) / \
127 sizeof(*TS_failure_info))
128
129/* Functions for verifying a signed TS_TST_INFO structure. */
130
131/*
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.
142 */
143int
144TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
145 X509_STORE *store, X509 **signer_out)
146{
147 STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL;
148 PKCS7_SIGNER_INFO *si;
149 STACK_OF(X509) *signers = NULL;
150 X509 *signer;
151 STACK_OF(X509) *chain = NULL;
152 char buf[4096];
153 int i, j = 0, ret = 0;
154 BIO *p7bio = NULL;
155
156 /* Some sanity checks first. */
157 if (!token) {
158 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER);
159 goto err;
160 }
161
162 /* Check for the correct content type */
163 if (!PKCS7_type_is_signed(token)) {
164 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE);
165 goto err;
166 }
167
168 /* Check if there is one and only one signer. */
169 sinfos = PKCS7_get_signer_info(token);
170 if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) {
171 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE,
172 TS_R_THERE_MUST_BE_ONE_SIGNER);
173 goto err;
174 }
175 si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
176
177 /* Check for no content: no data to verify signature. */
178 if (PKCS7_get_detached(token)) {
179 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT);
180 goto err;
181 }
182
183 /* Get hold of the signer certificate, search only internal
184 certificates if it was requested. */
185 signers = PKCS7_get0_signers(token, certs, 0);
186 if (!signers || sk_X509_num(signers) != 1)
187 goto err;
188 signer = sk_X509_value(signers, 0);
189
190 /* Now verify the certificate. */
191 if (!TS_verify_cert(store, certs, signer, &chain))
192 goto err;
193
194 /* Check if the signer certificate is consistent with the
195 ESS extension. */
196 if (!TS_check_signing_certs(si, chain))
197 goto err;
198
199 /* Creating the message digest. */
200 p7bio = PKCS7_dataInit(token, NULL);
201
202 /* We now have to 'read' from p7bio to calculate digests etc. */
203 while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0)
204 ;
205
206 /* Verifying the signature. */
207 j = PKCS7_signatureVerify(p7bio, token, si, signer);
208 if (j <= 0) {
209 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE);
210 goto err;
211 }
212
213 /* Return the signer certificate if needed. */
214 if (signer_out) {
215 *signer_out = signer;
216 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
217 }
218
219 ret = 1;
220
221err:
222 BIO_free_all(p7bio);
223 sk_X509_pop_free(chain, X509_free);
224 sk_X509_free(signers);
225
226 return ret;
227}
228
229/*
230 * The certificate chain is returned in chain. Caller is responsible for
231 * freeing the vector.
232 */
233static int
234TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, X509 *signer,
235 STACK_OF(X509) **chain)
236{
237 X509_STORE_CTX cert_ctx;
238 int i;
239 int ret = 1;
240
241 /* chain is an out argument. */
242 *chain = NULL;
243 X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted);
244 X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
245 i = X509_verify_cert(&cert_ctx);
246 if (i <= 0) {
247 int j = X509_STORE_CTX_get_error(&cert_ctx);
248 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
249 ERR_asprintf_error_data("Verify error:%s",
250 X509_verify_cert_error_string(j));
251 ret = 0;
252 } else {
253 /* Get a copy of the certificate chain. */
254 *chain = X509_STORE_CTX_get1_chain(&cert_ctx);
255 }
256
257 X509_STORE_CTX_cleanup(&cert_ctx);
258
259 return ret;
260}
261
262static int
263TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain)
264{
265 ESS_SIGNING_CERT *ss = ESS_get_signing_cert(si);
266 STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
267 X509 *cert;
268 int i = 0;
269 int ret = 0;
270
271 if (!ss)
272 goto err;
273 cert_ids = ss->cert_ids;
274 /* The signer certificate must be the first in cert_ids. */
275 cert = sk_X509_value(chain, 0);
276 if (TS_find_cert(cert_ids, cert) != 0)
277 goto err;
278
279 /* Check the other certificates of the chain if there are more
280 than one certificate ids in cert_ids. */
281 if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
282 /* All the certificates of the chain must be in cert_ids. */
283 for (i = 1; i < sk_X509_num(chain); ++i) {
284 cert = sk_X509_value(chain, i);
285 if (TS_find_cert(cert_ids, cert) < 0)
286 goto err;
287 }
288 }
289 ret = 1;
290
291err:
292 if (!ret)
293 TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
294 TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
295 ESS_SIGNING_CERT_free(ss);
296 return ret;
297}
298
299static ESS_SIGNING_CERT *
300ESS_get_signing_cert(PKCS7_SIGNER_INFO *si)
301{
302 ASN1_TYPE *attr;
303 const unsigned char *p;
304
305 attr = PKCS7_get_signed_attribute(si,
306 NID_id_smime_aa_signingCertificate);
307 if (!attr)
308 return NULL;
309 p = attr->value.sequence->data;
310 return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
311}
312
313/* Returns < 0 if certificate is not found, certificate index otherwise. */
314static int
315TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
316{
317 int i;
318
319 if (!cert_ids || !cert)
320 return -1;
321
322 /* Recompute SHA1 hash of certificate if necessary (side effect). */
323 X509_check_purpose(cert, -1, 0);
324
325 /* Look for cert in the cert_ids vector. */
326 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
327 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
328
329 /* Check the SHA-1 hash first. */
330 if (cid->hash->length == sizeof(cert->sha1_hash) &&
331 !memcmp(cid->hash->data, cert->sha1_hash,
332 sizeof(cert->sha1_hash))) {
333 /* Check the issuer/serial as well if specified. */
334 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
335 if (!is || !TS_issuer_serial_cmp(is, cert->cert_info))
336 return i;
337 }
338 }
339
340 return -1;
341}
342
343static int
344TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo)
345{
346 GENERAL_NAME *issuer;
347
348 if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1)
349 return -1;
350
351 /* Check the issuer first. It must be a directory name. */
352 issuer = sk_GENERAL_NAME_value(is->issuer, 0);
353 if (issuer->type != GEN_DIRNAME ||
354 X509_NAME_cmp(issuer->d.dirn, cinfo->issuer))
355 return -1;
356
357 /* Check the serial number, too. */
358 if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber))
359 return -1;
360
361 return 0;
362}
363
364/*
365 * Verifies whether 'response' contains a valid response with regards
366 * to the settings of the context:
367 * - Gives an error message if the TS_TST_INFO is not present.
368 * - Calls _TS_RESP_verify_token to verify the token content.
369 */
370int
371TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
372{
373 PKCS7 *token = TS_RESP_get_token(response);
374 TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
375 int ret = 0;
376
377 /* Check if we have a successful TS_TST_INFO object in place. */
378 if (!TS_check_status_info(response))
379 goto err;
380
381 /* Check the contents of the time stamp token. */
382 if (!int_TS_RESP_verify_token(ctx, token, tst_info))
383 goto err;
384
385 ret = 1;
386
387err:
388 return ret;
389}
390
391/*
392 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
393 * calls the internal int_TS_RESP_verify_token function for verifying it.
394 */
395int
396TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
397{
398 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
399 int ret = 0;
400
401 if (tst_info) {
402 ret = int_TS_RESP_verify_token(ctx, token, tst_info);
403 TS_TST_INFO_free(tst_info);
404 }
405 return ret;
406}
407
408/*
409 * Verifies whether the 'token' contains a valid time stamp token
410 * with regards to the settings of the context. Only those checks are
411 * carried out that are specified in the context:
412 * - Verifies the signature of the TS_TST_INFO.
413 * - Checks the version number of the response.
414 * - Check if the requested and returned policies math.
415 * - Check if the message imprints are the same.
416 * - Check if the nonces are the same.
417 * - Check if the TSA name matches the signer.
418 * - Check if the TSA name is the expected TSA.
419 */
420static int
421int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token,
422 TS_TST_INFO *tst_info)
423{
424 X509 *signer = NULL;
425 GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info);
426 X509_ALGOR *md_alg = NULL;
427 unsigned char *imprint = NULL;
428 unsigned imprint_len = 0;
429 int ret = 0;
430
431 /* Verify the signature. */
432 if ((ctx->flags & TS_VFY_SIGNATURE) &&
433 !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
434 goto err;
435
436 /* Check version number of response. */
437 if ((ctx->flags & TS_VFY_VERSION) &&
438 TS_TST_INFO_get_version(tst_info) != 1) {
439 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
440 goto err;
441 }
442
443 /* Check policies. */
444 if ((ctx->flags & TS_VFY_POLICY) &&
445 !TS_check_policy(ctx->policy, tst_info))
446 goto err;
447
448 /* Check message imprints. */
449 if ((ctx->flags & TS_VFY_IMPRINT) &&
450 !TS_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
451 tst_info))
452 goto err;
453
454 /* Compute and check message imprints. */
455 if ((ctx->flags & TS_VFY_DATA) &&
456 (!TS_compute_imprint(ctx->data, tst_info,
457 &md_alg, &imprint, &imprint_len) ||
458 !TS_check_imprints(md_alg, imprint, imprint_len, tst_info)))
459 goto err;
460
461 /* Check nonces. */
462 if ((ctx->flags & TS_VFY_NONCE) &&
463 !TS_check_nonces(ctx->nonce, tst_info))
464 goto err;
465
466 /* Check whether TSA name and signer certificate match. */
467 if ((ctx->flags & TS_VFY_SIGNER) &&
468 tsa_name && !TS_check_signer_name(tsa_name, signer)) {
469 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
470 goto err;
471 }
472
473 /* Check whether the TSA is the expected one. */
474 if ((ctx->flags & TS_VFY_TSA_NAME) &&
475 !TS_check_signer_name(ctx->tsa_name, signer)) {
476 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
477 goto err;
478 }
479
480 ret = 1;
481
482err:
483 X509_free(signer);
484 X509_ALGOR_free(md_alg);
485 free(imprint);
486 return ret;
487}
488
489static int
490TS_check_status_info(TS_RESP *response)
491{
492 TS_STATUS_INFO *info = TS_RESP_get_status_info(response);
493 long status = ASN1_INTEGER_get(info->status);
494 const char *status_text = NULL;
495 char *embedded_status_text = NULL;
496 char failure_text[TS_STATUS_BUF_SIZE] = "";
497
498 /* Check if everything went fine. */
499 if (status == 0 || status == 1)
500 return 1;
501
502 /* There was an error, get the description in status_text. */
503 if (0 <= status && status < (long)TS_STATUS_TEXT_SIZE)
504 status_text = TS_status_text[status];
505 else
506 status_text = "unknown code";
507
508 /* Set the embedded_status_text to the returned description. */
509 if (sk_ASN1_UTF8STRING_num(info->text) > 0 &&
510 !(embedded_status_text = TS_get_status_text(info->text)))
511 return 0;
512
513 /* Filling in failure_text with the failure information. */
514 if (info->failure_info) {
515 int i;
516 int first = 1;
517 for (i = 0; i < (int)TS_FAILURE_INFO_SIZE; ++i) {
518 if (ASN1_BIT_STRING_get_bit(info->failure_info,
519 TS_failure_info[i].code)) {
520 if (!first)
521 strlcat(failure_text, ",",
522 TS_STATUS_BUF_SIZE);
523 else
524 first = 0;
525 strlcat(failure_text, TS_failure_info[i].text,
526 TS_STATUS_BUF_SIZE);
527 }
528 }
529 }
530 if (failure_text[0] == '\0')
531 strlcpy(failure_text, "unspecified", TS_STATUS_BUF_SIZE);
532
533 /* Making up the error string. */
534 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
535 ERR_asprintf_error_data
536 ("status code: %s, status text: %s, failure codes: %s",
537 status_text,
538 embedded_status_text ? embedded_status_text : "unspecified",
539 failure_text);
540 free(embedded_status_text);
541
542 return 0;
543}
544
545static char *
546TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
547{
548 int i;
549 unsigned int length = 0;
550 char *result = NULL;
551
552 /* Determine length first. */
553 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
554 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
555 length += ASN1_STRING_length(current);
556 length += 1; /* separator character */
557 }
558 /* Allocate memory (closing '\0' included). */
559 if (!(result = malloc(length))) {
560 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
561 return NULL;
562 }
563 /* Concatenate the descriptions. */
564 result[0] = '\0';
565 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
566 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
567 if (i > 0)
568 strlcat(result, "/", length);
569 strlcat(result, (const char *)ASN1_STRING_data(current), length);
570 }
571 return result;
572}
573
574static int
575TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info)
576{
577 ASN1_OBJECT *resp_oid = TS_TST_INFO_get_policy_id(tst_info);
578
579 if (OBJ_cmp(req_oid, resp_oid) != 0) {
580 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
581 return 0;
582 }
583
584 return 1;
585}
586
587static int
588TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, X509_ALGOR **md_alg,
589 unsigned char **imprint, unsigned *imprint_len)
590{
591 TS_MSG_IMPRINT *msg_imprint = TS_TST_INFO_get_msg_imprint(tst_info);
592 X509_ALGOR *md_alg_resp = TS_MSG_IMPRINT_get_algo(msg_imprint);
593 const EVP_MD *md;
594 EVP_MD_CTX md_ctx;
595 unsigned char buffer[4096];
596 int length;
597
598 *md_alg = NULL;
599 *imprint = NULL;
600
601 /* Return the MD algorithm of the response. */
602 if (!(*md_alg = X509_ALGOR_dup(md_alg_resp)))
603 goto err;
604
605 /* Getting the MD object. */
606 if (!(md = EVP_get_digestbyobj((*md_alg)->algorithm))) {
607 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
608 goto err;
609 }
610
611 /* Compute message digest. */
612 length = EVP_MD_size(md);
613 if (length < 0)
614 goto err;
615 *imprint_len = length;
616 if (!(*imprint = malloc(*imprint_len))) {
617 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
618 goto err;
619 }
620
621 if (!EVP_DigestInit(&md_ctx, md))
622 goto err;
623 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
624 if (!EVP_DigestUpdate(&md_ctx, buffer, length))
625 goto err;
626 }
627 if (!EVP_DigestFinal(&md_ctx, *imprint, NULL))
628 goto err;
629
630 return 1;
631
632err:
633 X509_ALGOR_free(*md_alg);
634 free(*imprint);
635 *imprint = NULL;
636 *imprint_len = 0;
637 return 0;
638}
639
640static int
641TS_check_imprints(X509_ALGOR *algor_a, unsigned char *imprint_a, unsigned len_a,
642 TS_TST_INFO *tst_info)
643{
644 TS_MSG_IMPRINT *b = TS_TST_INFO_get_msg_imprint(tst_info);
645 X509_ALGOR *algor_b = TS_MSG_IMPRINT_get_algo(b);
646 int ret = 0;
647
648 /* algor_a is optional. */
649 if (algor_a) {
650 /* Compare algorithm OIDs. */
651 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
652 goto err;
653
654 /* The parameter must be NULL in both. */
655 if ((algor_a->parameter &&
656 ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) ||
657 (algor_b->parameter &&
658 ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
659 goto err;
660 }
661
662 /* Compare octet strings. */
663 ret = len_a == (unsigned) ASN1_STRING_length(b->hashed_msg) &&
664 memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0;
665
666err:
667 if (!ret)
668 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
669 return ret;
670}
671
672static int
673TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
674{
675 const ASN1_INTEGER *b = TS_TST_INFO_get_nonce(tst_info);
676
677 /* Error if nonce is missing. */
678 if (!b) {
679 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
680 return 0;
681 }
682
683 /* No error if a nonce is returned without being requested. */
684 if (ASN1_INTEGER_cmp(a, b) != 0) {
685 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
686 return 0;
687 }
688
689 return 1;
690}
691
692/* Check if the specified TSA name matches either the subject
693 or one of the subject alternative names of the TSA certificate. */
694static int
695TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
696{
697 STACK_OF(GENERAL_NAME) *gen_names = NULL;
698 int idx = -1;
699 int found = 0;
700
701 /* Check the subject name first. */
702 if (tsa_name->type == GEN_DIRNAME &&
703 X509_name_cmp(tsa_name->d.dirn, signer->cert_info->subject) == 0)
704 return 1;
705
706 /* Check all the alternative names. */
707 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name,
708 NULL, &idx);
709 while (gen_names != NULL &&
710 !(found = TS_find_name(gen_names, tsa_name) >= 0)) {
711 /* Get the next subject alternative name,
712 although there should be no more than one. */
713 GENERAL_NAMES_free(gen_names);
714 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name,
715 NULL, &idx);
716 }
717 if (gen_names)
718 GENERAL_NAMES_free(gen_names);
719
720 return found;
721}
722
723/* Returns 1 if name is in gen_names, 0 otherwise. */
724static int
725TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
726{
727 int i, found;
728 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names);
729 ++i) {
730 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
731 found = GENERAL_NAME_cmp(current, name) == 0;
732 }
733 return found ? i - 1 : -1;
734}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-25 09:25:38 +0000