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-rw-r--r--src/lib/libcrypto/ts/ts_rsp_verify.c745
1 files changed, 0 insertions, 745 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 204c6a9df8..0000000000
--- a/src/lib/libcrypto/ts/ts_rsp_verify.c
+++ /dev/null
@@ -1,745 +0,0 @@
1/* $OpenBSD: ts_rsp_verify.c,v 1.16 2015/07/19 18:25:59 miod 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 = 0;
240
241 /* chain is an out argument. */
242 *chain = NULL;
243 if (X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted) == 0) {
244 TSerr(TS_F_TS_VERIFY_CERT, ERR_R_X509_LIB);
245 goto err;
246 }
247 X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
248 i = X509_verify_cert(&cert_ctx);
249 if (i <= 0) {
250 int j = X509_STORE_CTX_get_error(&cert_ctx);
251
252 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
253 ERR_asprintf_error_data("Verify error:%s",
254 X509_verify_cert_error_string(j));
255 goto err;
256 } else {
257 /* Get a copy of the certificate chain. */
258 *chain = X509_STORE_CTX_get1_chain(&cert_ctx);
259 ret = 1;
260 }
261
262err:
263 X509_STORE_CTX_cleanup(&cert_ctx);
264
265 return ret;
266}
267
268static int
269TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain)
270{
271 ESS_SIGNING_CERT *ss = ESS_get_signing_cert(si);
272 STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
273 X509 *cert;
274 int i = 0;
275 int ret = 0;
276
277 if (!ss)
278 goto err;
279 cert_ids = ss->cert_ids;
280 /* The signer certificate must be the first in cert_ids. */
281 cert = sk_X509_value(chain, 0);
282 if (TS_find_cert(cert_ids, cert) != 0)
283 goto err;
284
285 /* Check the other certificates of the chain if there are more
286 than one certificate ids in cert_ids. */
287 if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
288 /* All the certificates of the chain must be in cert_ids. */
289 for (i = 1; i < sk_X509_num(chain); ++i) {
290 cert = sk_X509_value(chain, i);
291 if (TS_find_cert(cert_ids, cert) < 0)
292 goto err;
293 }
294 }
295 ret = 1;
296
297err:
298 if (!ret)
299 TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
300 TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
301 ESS_SIGNING_CERT_free(ss);
302 return ret;
303}
304
305static ESS_SIGNING_CERT *
306ESS_get_signing_cert(PKCS7_SIGNER_INFO *si)
307{
308 ASN1_TYPE *attr;
309 const unsigned char *p;
310
311 attr = PKCS7_get_signed_attribute(si,
312 NID_id_smime_aa_signingCertificate);
313 if (!attr)
314 return NULL;
315 if (attr->type != V_ASN1_SEQUENCE)
316 return NULL;
317 p = attr->value.sequence->data;
318 return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
319}
320
321/* Returns < 0 if certificate is not found, certificate index otherwise. */
322static int
323TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
324{
325 int i;
326
327 if (!cert_ids || !cert)
328 return -1;
329
330 /* Recompute SHA1 hash of certificate if necessary (side effect). */
331 X509_check_purpose(cert, -1, 0);
332
333 /* Look for cert in the cert_ids vector. */
334 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
335 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
336
337 /* Check the SHA-1 hash first. */
338 if (cid->hash->length == sizeof(cert->sha1_hash) &&
339 !memcmp(cid->hash->data, cert->sha1_hash,
340 sizeof(cert->sha1_hash))) {
341 /* Check the issuer/serial as well if specified. */
342 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
343 if (!is || !TS_issuer_serial_cmp(is, cert->cert_info))
344 return i;
345 }
346 }
347
348 return -1;
349}
350
351static int
352TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo)
353{
354 GENERAL_NAME *issuer;
355
356 if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1)
357 return -1;
358
359 /* Check the issuer first. It must be a directory name. */
360 issuer = sk_GENERAL_NAME_value(is->issuer, 0);
361 if (issuer->type != GEN_DIRNAME ||
362 X509_NAME_cmp(issuer->d.dirn, cinfo->issuer))
363 return -1;
364
365 /* Check the serial number, too. */
366 if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber))
367 return -1;
368
369 return 0;
370}
371
372/*
373 * Verifies whether 'response' contains a valid response with regards
374 * to the settings of the context:
375 * - Gives an error message if the TS_TST_INFO is not present.
376 * - Calls _TS_RESP_verify_token to verify the token content.
377 */
378int
379TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
380{
381 PKCS7 *token = TS_RESP_get_token(response);
382 TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
383 int ret = 0;
384
385 /* Check if we have a successful TS_TST_INFO object in place. */
386 if (!TS_check_status_info(response))
387 goto err;
388
389 /* Check the contents of the time stamp token. */
390 if (!int_TS_RESP_verify_token(ctx, token, tst_info))
391 goto err;
392
393 ret = 1;
394
395err:
396 return ret;
397}
398
399/*
400 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
401 * calls the internal int_TS_RESP_verify_token function for verifying it.
402 */
403int
404TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
405{
406 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
407 int ret = 0;
408
409 if (tst_info) {
410 ret = int_TS_RESP_verify_token(ctx, token, tst_info);
411 TS_TST_INFO_free(tst_info);
412 }
413 return ret;
414}
415
416/*
417 * Verifies whether the 'token' contains a valid time stamp token
418 * with regards to the settings of the context. Only those checks are
419 * carried out that are specified in the context:
420 * - Verifies the signature of the TS_TST_INFO.
421 * - Checks the version number of the response.
422 * - Check if the requested and returned policies math.
423 * - Check if the message imprints are the same.
424 * - Check if the nonces are the same.
425 * - Check if the TSA name matches the signer.
426 * - Check if the TSA name is the expected TSA.
427 */
428static int
429int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token,
430 TS_TST_INFO *tst_info)
431{
432 X509 *signer = NULL;
433 GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info);
434 X509_ALGOR *md_alg = NULL;
435 unsigned char *imprint = NULL;
436 unsigned imprint_len = 0;
437 int ret = 0;
438
439 /* Verify the signature. */
440 if ((ctx->flags & TS_VFY_SIGNATURE) &&
441 !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
442 goto err;
443
444 /* Check version number of response. */
445 if ((ctx->flags & TS_VFY_VERSION) &&
446 TS_TST_INFO_get_version(tst_info) != 1) {
447 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
448 goto err;
449 }
450
451 /* Check policies. */
452 if ((ctx->flags & TS_VFY_POLICY) &&
453 !TS_check_policy(ctx->policy, tst_info))
454 goto err;
455
456 /* Check message imprints. */
457 if ((ctx->flags & TS_VFY_IMPRINT) &&
458 !TS_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
459 tst_info))
460 goto err;
461
462 /* Compute and check message imprints. */
463 if ((ctx->flags & TS_VFY_DATA) &&
464 (!TS_compute_imprint(ctx->data, tst_info,
465 &md_alg, &imprint, &imprint_len) ||
466 !TS_check_imprints(md_alg, imprint, imprint_len, tst_info)))
467 goto err;
468
469 /* Check nonces. */
470 if ((ctx->flags & TS_VFY_NONCE) &&
471 !TS_check_nonces(ctx->nonce, tst_info))
472 goto err;
473
474 /* Check whether TSA name and signer certificate match. */
475 if ((ctx->flags & TS_VFY_SIGNER) &&
476 tsa_name && !TS_check_signer_name(tsa_name, signer)) {
477 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
478 goto err;
479 }
480
481 /* Check whether the TSA is the expected one. */
482 if ((ctx->flags & TS_VFY_TSA_NAME) &&
483 !TS_check_signer_name(ctx->tsa_name, signer)) {
484 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
485 goto err;
486 }
487
488 ret = 1;
489
490err:
491 X509_free(signer);
492 X509_ALGOR_free(md_alg);
493 free(imprint);
494 return ret;
495}
496
497static int
498TS_check_status_info(TS_RESP *response)
499{
500 TS_STATUS_INFO *info = TS_RESP_get_status_info(response);
501 long status = ASN1_INTEGER_get(info->status);
502 const char *status_text = NULL;
503 char *embedded_status_text = NULL;
504 char failure_text[TS_STATUS_BUF_SIZE] = "";
505
506 /* Check if everything went fine. */
507 if (status == 0 || status == 1)
508 return 1;
509
510 /* There was an error, get the description in status_text. */
511 if (0 <= status && status < (long)TS_STATUS_TEXT_SIZE)
512 status_text = TS_status_text[status];
513 else
514 status_text = "unknown code";
515
516 /* Set the embedded_status_text to the returned description. */
517 if (sk_ASN1_UTF8STRING_num(info->text) > 0 &&
518 !(embedded_status_text = TS_get_status_text(info->text)))
519 return 0;
520
521 /* Filling in failure_text with the failure information. */
522 if (info->failure_info) {
523 int i;
524 int first = 1;
525 for (i = 0; i < (int)TS_FAILURE_INFO_SIZE; ++i) {
526 if (ASN1_BIT_STRING_get_bit(info->failure_info,
527 TS_failure_info[i].code)) {
528 if (!first)
529 strlcat(failure_text, ",",
530 TS_STATUS_BUF_SIZE);
531 else
532 first = 0;
533 strlcat(failure_text, TS_failure_info[i].text,
534 TS_STATUS_BUF_SIZE);
535 }
536 }
537 }
538 if (failure_text[0] == '\0')
539 strlcpy(failure_text, "unspecified", TS_STATUS_BUF_SIZE);
540
541 /* Making up the error string. */
542 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
543 ERR_asprintf_error_data
544 ("status code: %s, status text: %s, failure codes: %s",
545 status_text,
546 embedded_status_text ? embedded_status_text : "unspecified",
547 failure_text);
548 free(embedded_status_text);
549
550 return 0;
551}
552
553static char *
554TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
555{
556 int i;
557 unsigned int length = 0;
558 char *result = NULL;
559
560 /* Determine length first. */
561 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
562 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
563 length += ASN1_STRING_length(current);
564 length += 1; /* separator character */
565 }
566 /* Allocate memory (closing '\0' included). */
567 if (!(result = malloc(length))) {
568 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
569 return NULL;
570 }
571 /* Concatenate the descriptions. */
572 result[0] = '\0';
573 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
574 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
575 if (i > 0)
576 strlcat(result, "/", length);
577 strlcat(result, (const char *)ASN1_STRING_data(current), length);
578 }
579 return result;
580}
581
582static int
583TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info)
584{
585 ASN1_OBJECT *resp_oid = TS_TST_INFO_get_policy_id(tst_info);
586
587 if (OBJ_cmp(req_oid, resp_oid) != 0) {
588 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
589 return 0;
590 }
591
592 return 1;
593}
594
595static int
596TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, X509_ALGOR **md_alg,
597 unsigned char **imprint, unsigned *imprint_len)
598{
599 TS_MSG_IMPRINT *msg_imprint = TS_TST_INFO_get_msg_imprint(tst_info);
600 X509_ALGOR *md_alg_resp = TS_MSG_IMPRINT_get_algo(msg_imprint);
601 const EVP_MD *md;
602 EVP_MD_CTX md_ctx;
603 unsigned char buffer[4096];
604 int length;
605
606 *md_alg = NULL;
607 *imprint = NULL;
608
609 /* Return the MD algorithm of the response. */
610 if (!(*md_alg = X509_ALGOR_dup(md_alg_resp)))
611 goto err;
612
613 /* Getting the MD object. */
614 if (!(md = EVP_get_digestbyobj((*md_alg)->algorithm))) {
615 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
616 goto err;
617 }
618
619 /* Compute message digest. */
620 length = EVP_MD_size(md);
621 if (length < 0)
622 goto err;
623 *imprint_len = length;
624 if (!(*imprint = malloc(*imprint_len))) {
625 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
626 goto err;
627 }
628
629 if (!EVP_DigestInit(&md_ctx, md))
630 goto err;
631 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
632 if (!EVP_DigestUpdate(&md_ctx, buffer, length))
633 goto err;
634 }
635 if (!EVP_DigestFinal(&md_ctx, *imprint, NULL))
636 goto err;
637
638 return 1;
639
640err:
641 X509_ALGOR_free(*md_alg);
642 free(*imprint);
643 *imprint = NULL;
644 *imprint_len = 0;
645 return 0;
646}
647
648static int
649TS_check_imprints(X509_ALGOR *algor_a, unsigned char *imprint_a, unsigned len_a,
650 TS_TST_INFO *tst_info)
651{
652 TS_MSG_IMPRINT *b = TS_TST_INFO_get_msg_imprint(tst_info);
653 X509_ALGOR *algor_b = TS_MSG_IMPRINT_get_algo(b);
654 int ret = 0;
655
656 /* algor_a is optional. */
657 if (algor_a) {
658 /* Compare algorithm OIDs. */
659 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
660 goto err;
661
662 /* The parameter must be NULL in both. */
663 if ((algor_a->parameter &&
664 ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) ||
665 (algor_b->parameter &&
666 ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
667 goto err;
668 }
669
670 /* Compare octet strings. */
671 ret = len_a == (unsigned) ASN1_STRING_length(b->hashed_msg) &&
672 memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0;
673
674err:
675 if (!ret)
676 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
677 return ret;
678}
679
680static int
681TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
682{
683 const ASN1_INTEGER *b = TS_TST_INFO_get_nonce(tst_info);
684
685 /* Error if nonce is missing. */
686 if (!b) {
687 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
688 return 0;
689 }
690
691 /* No error if a nonce is returned without being requested. */
692 if (ASN1_INTEGER_cmp(a, b) != 0) {
693 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
694 return 0;
695 }
696
697 return 1;
698}
699
700/* Check if the specified TSA name matches either the subject
701 or one of the subject alternative names of the TSA certificate. */
702static int
703TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
704{
705 STACK_OF(GENERAL_NAME) *gen_names = NULL;
706 int idx = -1;
707 int found = 0;
708
709 if (signer == NULL)
710 return 0;
711
712 /* Check the subject name first. */
713 if (tsa_name->type == GEN_DIRNAME &&
714 X509_name_cmp(tsa_name->d.dirn, signer->cert_info->subject) == 0)
715 return 1;
716
717 /* Check all the alternative names. */
718 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name,
719 NULL, &idx);
720 while (gen_names != NULL &&
721 !(found = (TS_find_name(gen_names, tsa_name) >= 0))) {
722 /* Get the next subject alternative name,
723 although there should be no more than one. */
724 GENERAL_NAMES_free(gen_names);
725 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name,
726 NULL, &idx);
727 }
728 if (gen_names)
729 GENERAL_NAMES_free(gen_names);
730
731 return found;
732}
733
734/* Returns 1 if name is in gen_names, 0 otherwise. */
735static int
736TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
737{
738 int i, found;
739 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names);
740 ++i) {
741 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
742 found = GENERAL_NAME_cmp(current, name) == 0;
743 }
744 return found ? i - 1 : -1;
745}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-05-07 21:22:20 +0000