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0f113f3e MC |
1 | /* |
2 | * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project | |
3 | * 2002. | |
c7235be6 UM |
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 | |
0f113f3e | 13 | * notice, this list of conditions and the following disclaimer. |
c7235be6 UM |
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> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
c7235be6 UM |
61 | #include <openssl/objects.h> |
62 | #include <openssl/ts.h> | |
63 | #include <openssl/pkcs7.h> | |
ca4a494c | 64 | #include "ts_lcl.h" |
c7235be6 | 65 | |
9c422b5b | 66 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
0f113f3e | 67 | X509 *signer, STACK_OF(X509) **chain); |
9c422b5b | 68 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, |
0f113f3e | 69 | STACK_OF(X509) *chain); |
9c422b5b RS |
70 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si); |
71 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert); | |
a8d8e06b | 72 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert); |
9c422b5b | 73 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, |
0f113f3e | 74 | PKCS7 *token, TS_TST_INFO *tst_info); |
9c422b5b RS |
75 | static int ts_check_status_info(TS_RESP *response); |
76 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text); | |
77 | static int ts_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info); | |
78 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, | |
0f113f3e MC |
79 | X509_ALGOR **md_alg, |
80 | unsigned char **imprint, unsigned *imprint_len); | |
9c422b5b | 81 | static int ts_check_imprints(X509_ALGOR *algor_a, |
0f113f3e MC |
82 | unsigned char *imprint_a, unsigned len_a, |
83 | TS_TST_INFO *tst_info); | |
9c422b5b RS |
84 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); |
85 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer); | |
86 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, | |
0f113f3e | 87 | GENERAL_NAME *name); |
c7235be6 | 88 | |
0704343f GP |
89 | /* |
90 | * This must be large enough to hold all values in ts_status_text (with | |
91 | * comma separator) or all text fields in ts_failure_info (also with comma). | |
92 | */ | |
93 | #define TS_STATUS_BUF_SIZE 256 | |
94 | ||
c7235be6 UM |
95 | /* |
96 | * Local mapping between response codes and descriptions. | |
c7235be6 | 97 | */ |
0704343f GP |
98 | static const char *ts_status_text[] = { |
99 | "granted", | |
0f113f3e MC |
100 | "grantedWithMods", |
101 | "rejection", | |
102 | "waiting", | |
103 | "revocationWarning", | |
104 | "revocationNotification" | |
105 | }; | |
c7235be6 | 106 | |
9c422b5b | 107 | #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text) |
c7235be6 | 108 | |
0f113f3e MC |
109 | static struct { |
110 | int code; | |
111 | const char *text; | |
9c422b5b RS |
112 | } ts_failure_info[] = { |
113 | {TS_INFO_BAD_ALG, "badAlg"}, | |
114 | {TS_INFO_BAD_REQUEST, "badRequest"}, | |
115 | {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"}, | |
116 | {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"}, | |
117 | {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"}, | |
118 | {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"}, | |
119 | {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"}, | |
120 | {TS_INFO_SYSTEM_FAILURE, "systemFailure"} | |
0f113f3e MC |
121 | }; |
122 | ||
c7235be6 | 123 | |
c80fd6b2 | 124 | /*- |
c7235be6 | 125 | * This function carries out the following tasks: |
0f113f3e MC |
126 | * - Checks if there is one and only one signer. |
127 | * - Search for the signing certificate in 'certs' and in the response. | |
128 | * - Check the extended key usage and key usage fields of the signer | |
129 | * certificate (done by the path validation). | |
130 | * - Build and validate the certificate path. | |
131 | * - Check if the certificate path meets the requirements of the | |
132 | * SigningCertificate ESS signed attribute. | |
133 | * - Verify the signature value. | |
134 | * - Returns the signer certificate in 'signer', if 'signer' is not NULL. | |
c7235be6 UM |
135 | */ |
136 | int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, | |
0f113f3e MC |
137 | X509_STORE *store, X509 **signer_out) |
138 | { | |
139 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; | |
140 | PKCS7_SIGNER_INFO *si; | |
141 | STACK_OF(X509) *signers = NULL; | |
142 | X509 *signer; | |
143 | STACK_OF(X509) *chain = NULL; | |
144 | char buf[4096]; | |
145 | int i, j = 0, ret = 0; | |
146 | BIO *p7bio = NULL; | |
147 | ||
148 | /* Some sanity checks first. */ | |
149 | if (!token) { | |
150 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); | |
151 | goto err; | |
152 | } | |
0f113f3e MC |
153 | if (!PKCS7_type_is_signed(token)) { |
154 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); | |
155 | goto err; | |
156 | } | |
0f113f3e MC |
157 | sinfos = PKCS7_get_signer_info(token); |
158 | if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) { | |
159 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER); | |
160 | goto err; | |
161 | } | |
162 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); | |
0f113f3e MC |
163 | if (PKCS7_get_detached(token)) { |
164 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT); | |
165 | goto err; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Get hold of the signer certificate, search only internal certificates | |
170 | * if it was requested. | |
171 | */ | |
172 | signers = PKCS7_get0_signers(token, certs, 0); | |
173 | if (!signers || sk_X509_num(signers) != 1) | |
174 | goto err; | |
175 | signer = sk_X509_value(signers, 0); | |
176 | ||
9c422b5b | 177 | if (!ts_verify_cert(store, certs, signer, &chain)) |
0f113f3e | 178 | goto err; |
9c422b5b | 179 | if (!ts_check_signing_certs(si, chain)) |
0f113f3e | 180 | goto err; |
0f113f3e MC |
181 | p7bio = PKCS7_dataInit(token, NULL); |
182 | ||
183 | /* We now have to 'read' from p7bio to calculate digests etc. */ | |
18cd23df RS |
184 | while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0) |
185 | continue; | |
0f113f3e | 186 | |
0f113f3e MC |
187 | j = PKCS7_signatureVerify(p7bio, token, si, signer); |
188 | if (j <= 0) { | |
189 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); | |
190 | goto err; | |
191 | } | |
192 | ||
0f113f3e MC |
193 | if (signer_out) { |
194 | *signer_out = signer; | |
05f0fb9f | 195 | X509_up_ref(signer); |
0f113f3e | 196 | } |
0f113f3e | 197 | ret = 1; |
c7235be6 UM |
198 | |
199 | err: | |
0f113f3e MC |
200 | BIO_free_all(p7bio); |
201 | sk_X509_pop_free(chain, X509_free); | |
202 | sk_X509_free(signers); | |
c7235be6 | 203 | |
0f113f3e MC |
204 | return ret; |
205 | } | |
c7235be6 UM |
206 | |
207 | /* | |
208 | * The certificate chain is returned in chain. Caller is responsible for | |
209 | * freeing the vector. | |
210 | */ | |
9c422b5b | 211 | static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, |
0f113f3e MC |
212 | X509 *signer, STACK_OF(X509) **chain) |
213 | { | |
214 | X509_STORE_CTX cert_ctx; | |
215 | int i; | |
216 | int ret = 1; | |
217 | ||
0f113f3e | 218 | *chain = NULL; |
e29c73c9 VD |
219 | if (!X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted)) |
220 | return 0; | |
0f113f3e MC |
221 | X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); |
222 | i = X509_verify_cert(&cert_ctx); | |
223 | if (i <= 0) { | |
224 | int j = X509_STORE_CTX_get_error(&cert_ctx); | |
225 | TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); | |
226 | ERR_add_error_data(2, "Verify error:", | |
227 | X509_verify_cert_error_string(j)); | |
228 | ret = 0; | |
229 | } else { | |
0f113f3e MC |
230 | *chain = X509_STORE_CTX_get1_chain(&cert_ctx); |
231 | } | |
232 | ||
233 | X509_STORE_CTX_cleanup(&cert_ctx); | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
9c422b5b | 238 | static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si, |
0f113f3e MC |
239 | STACK_OF(X509) *chain) |
240 | { | |
9c422b5b | 241 | ESS_SIGNING_CERT *ss = ess_get_signing_cert(si); |
0f113f3e MC |
242 | STACK_OF(ESS_CERT_ID) *cert_ids = NULL; |
243 | X509 *cert; | |
244 | int i = 0; | |
245 | int ret = 0; | |
246 | ||
247 | if (!ss) | |
248 | goto err; | |
249 | cert_ids = ss->cert_ids; | |
0f113f3e | 250 | cert = sk_X509_value(chain, 0); |
9c422b5b | 251 | if (ts_find_cert(cert_ids, cert) != 0) |
0f113f3e MC |
252 | goto err; |
253 | ||
254 | /* | |
255 | * Check the other certificates of the chain if there are more than one | |
256 | * certificate ids in cert_ids. | |
257 | */ | |
258 | if (sk_ESS_CERT_ID_num(cert_ids) > 1) { | |
0f113f3e MC |
259 | for (i = 1; i < sk_X509_num(chain); ++i) { |
260 | cert = sk_X509_value(chain, i); | |
9c422b5b | 261 | if (ts_find_cert(cert_ids, cert) < 0) |
0f113f3e MC |
262 | goto err; |
263 | } | |
264 | } | |
265 | ret = 1; | |
c7235be6 | 266 | err: |
0f113f3e MC |
267 | if (!ret) |
268 | TSerr(TS_F_TS_CHECK_SIGNING_CERTS, | |
269 | TS_R_ESS_SIGNING_CERTIFICATE_ERROR); | |
270 | ESS_SIGNING_CERT_free(ss); | |
271 | return ret; | |
272 | } | |
c7235be6 | 273 | |
9c422b5b | 274 | static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si) |
0f113f3e MC |
275 | { |
276 | ASN1_TYPE *attr; | |
277 | const unsigned char *p; | |
278 | attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate); | |
279 | if (!attr) | |
280 | return NULL; | |
281 | p = attr->value.sequence->data; | |
282 | return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); | |
283 | } | |
c7235be6 UM |
284 | |
285 | /* Returns < 0 if certificate is not found, certificate index otherwise. */ | |
9c422b5b | 286 | static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) |
0f113f3e MC |
287 | { |
288 | int i; | |
7e418832 | 289 | unsigned char cert_sha1[SHA_DIGEST_LENGTH]; |
0f113f3e MC |
290 | |
291 | if (!cert_ids || !cert) | |
292 | return -1; | |
293 | ||
7e418832 DSH |
294 | X509_digest(cert, EVP_sha1(), cert_sha1, NULL); |
295 | ||
0f113f3e MC |
296 | /* Recompute SHA1 hash of certificate if necessary (side effect). */ |
297 | X509_check_purpose(cert, -1, 0); | |
298 | ||
299 | /* Look for cert in the cert_ids vector. */ | |
300 | for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) { | |
301 | ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); | |
302 | ||
7e418832 DSH |
303 | if (cid->hash->length == SHA_DIGEST_LENGTH |
304 | && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) { | |
0f113f3e | 305 | ESS_ISSUER_SERIAL *is = cid->issuer_serial; |
a8d8e06b | 306 | if (!is || !ts_issuer_serial_cmp(is, cert)) |
0f113f3e MC |
307 | return i; |
308 | } | |
309 | } | |
310 | ||
311 | return -1; | |
312 | } | |
c7235be6 | 313 | |
a8d8e06b | 314 | static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509 *cert) |
0f113f3e MC |
315 | { |
316 | GENERAL_NAME *issuer; | |
c7235be6 | 317 | |
a8d8e06b | 318 | if (!is || !cert || sk_GENERAL_NAME_num(is->issuer) != 1) |
0f113f3e | 319 | return -1; |
c7235be6 | 320 | |
0f113f3e MC |
321 | issuer = sk_GENERAL_NAME_value(is->issuer, 0); |
322 | if (issuer->type != GEN_DIRNAME | |
a8d8e06b | 323 | || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert))) |
0f113f3e | 324 | return -1; |
c7235be6 | 325 | |
a8d8e06b | 326 | if (ASN1_INTEGER_cmp(is->serial, X509_get_serialNumber(cert))) |
0f113f3e | 327 | return -1; |
c7235be6 | 328 | |
0f113f3e MC |
329 | return 0; |
330 | } | |
c7235be6 | 331 | |
c80fd6b2 | 332 | /*- |
0f113f3e | 333 | * Verifies whether 'response' contains a valid response with regards |
c7235be6 | 334 | * to the settings of the context: |
0f113f3e MC |
335 | * - Gives an error message if the TS_TST_INFO is not present. |
336 | * - Calls _TS_RESP_verify_token to verify the token content. | |
c7235be6 UM |
337 | */ |
338 | int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) | |
0f113f3e | 339 | { |
ca4a494c RS |
340 | PKCS7 *token = response->token; |
341 | TS_TST_INFO *tst_info = response->tst_info; | |
0f113f3e | 342 | int ret = 0; |
c7235be6 | 343 | |
9c422b5b | 344 | if (!ts_check_status_info(response)) |
0f113f3e | 345 | goto err; |
9c422b5b | 346 | if (!int_ts_RESP_verify_token(ctx, token, tst_info)) |
0f113f3e | 347 | goto err; |
0f113f3e | 348 | ret = 1; |
18cd23df | 349 | |
c7235be6 | 350 | err: |
0f113f3e MC |
351 | return ret; |
352 | } | |
c7235be6 UM |
353 | |
354 | /* | |
355 | * Tries to extract a TS_TST_INFO structure from the PKCS7 token and | |
a291745e | 356 | * calls the internal int_TS_RESP_verify_token function for verifying it. |
c7235be6 UM |
357 | */ |
358 | int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) | |
0f113f3e MC |
359 | { |
360 | TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); | |
361 | int ret = 0; | |
362 | if (tst_info) { | |
9c422b5b | 363 | ret = int_ts_RESP_verify_token(ctx, token, tst_info); |
0f113f3e MC |
364 | TS_TST_INFO_free(tst_info); |
365 | } | |
366 | return ret; | |
367 | } | |
c7235be6 | 368 | |
1d97c843 | 369 | /*- |
0f113f3e | 370 | * Verifies whether the 'token' contains a valid time stamp token |
c7235be6 UM |
371 | * with regards to the settings of the context. Only those checks are |
372 | * carried out that are specified in the context: | |
0f113f3e MC |
373 | * - Verifies the signature of the TS_TST_INFO. |
374 | * - Checks the version number of the response. | |
375 | * - Check if the requested and returned policies math. | |
376 | * - Check if the message imprints are the same. | |
377 | * - Check if the nonces are the same. | |
378 | * - Check if the TSA name matches the signer. | |
379 | * - Check if the TSA name is the expected TSA. | |
c7235be6 | 380 | */ |
9c422b5b | 381 | static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx, |
0f113f3e MC |
382 | PKCS7 *token, TS_TST_INFO *tst_info) |
383 | { | |
384 | X509 *signer = NULL; | |
ca4a494c | 385 | GENERAL_NAME *tsa_name = tst_info->tsa; |
0f113f3e MC |
386 | X509_ALGOR *md_alg = NULL; |
387 | unsigned char *imprint = NULL; | |
388 | unsigned imprint_len = 0; | |
389 | int ret = 0; | |
390 | ||
0f113f3e MC |
391 | if ((ctx->flags & TS_VFY_SIGNATURE) |
392 | && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer)) | |
393 | goto err; | |
0f113f3e MC |
394 | if ((ctx->flags & TS_VFY_VERSION) |
395 | && TS_TST_INFO_get_version(tst_info) != 1) { | |
396 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); | |
397 | goto err; | |
398 | } | |
0f113f3e | 399 | if ((ctx->flags & TS_VFY_POLICY) |
9c422b5b | 400 | && !ts_check_policy(ctx->policy, tst_info)) |
0f113f3e | 401 | goto err; |
0f113f3e | 402 | if ((ctx->flags & TS_VFY_IMPRINT) |
9c422b5b | 403 | && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, |
0f113f3e MC |
404 | tst_info)) |
405 | goto err; | |
0f113f3e | 406 | if ((ctx->flags & TS_VFY_DATA) |
9c422b5b | 407 | && (!ts_compute_imprint(ctx->data, tst_info, |
0f113f3e | 408 | &md_alg, &imprint, &imprint_len) |
9c422b5b | 409 | || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info))) |
0f113f3e | 410 | goto err; |
0f113f3e | 411 | if ((ctx->flags & TS_VFY_NONCE) |
9c422b5b | 412 | && !ts_check_nonces(ctx->nonce, tst_info)) |
0f113f3e | 413 | goto err; |
0f113f3e | 414 | if ((ctx->flags & TS_VFY_SIGNER) |
9c422b5b | 415 | && tsa_name && !ts_check_signer_name(tsa_name, signer)) { |
0f113f3e MC |
416 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); |
417 | goto err; | |
418 | } | |
0f113f3e | 419 | if ((ctx->flags & TS_VFY_TSA_NAME) |
9c422b5b | 420 | && !ts_check_signer_name(ctx->tsa_name, signer)) { |
0f113f3e MC |
421 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); |
422 | goto err; | |
423 | } | |
0f113f3e | 424 | ret = 1; |
18cd23df | 425 | |
c7235be6 | 426 | err: |
0f113f3e MC |
427 | X509_free(signer); |
428 | X509_ALGOR_free(md_alg); | |
429 | OPENSSL_free(imprint); | |
430 | return ret; | |
431 | } | |
c7235be6 | 432 | |
9c422b5b | 433 | static int ts_check_status_info(TS_RESP *response) |
0f113f3e | 434 | { |
ca4a494c | 435 | TS_STATUS_INFO *info = response->status_info; |
0f113f3e MC |
436 | long status = ASN1_INTEGER_get(info->status); |
437 | const char *status_text = NULL; | |
438 | char *embedded_status_text = NULL; | |
439 | char failure_text[TS_STATUS_BUF_SIZE] = ""; | |
440 | ||
0f113f3e MC |
441 | if (status == 0 || status == 1) |
442 | return 1; | |
443 | ||
444 | /* There was an error, get the description in status_text. */ | |
0704343f | 445 | if (0 <= status && status < (long) OSSL_NELEM(ts_status_text)) |
9c422b5b | 446 | status_text = ts_status_text[status]; |
0f113f3e MC |
447 | else |
448 | status_text = "unknown code"; | |
449 | ||
0f113f3e | 450 | if (sk_ASN1_UTF8STRING_num(info->text) > 0 |
9c422b5b | 451 | && (embedded_status_text = ts_get_status_text(info->text)) == NULL) |
0f113f3e MC |
452 | return 0; |
453 | ||
18cd23df | 454 | /* Fill in failure_text with the failure information. */ |
0f113f3e MC |
455 | if (info->failure_info) { |
456 | int i; | |
457 | int first = 1; | |
18cd23df | 458 | for (i = 0; i < (int)OSSL_NELEM(ts_failure_info); ++i) { |
0f113f3e | 459 | if (ASN1_BIT_STRING_get_bit(info->failure_info, |
9c422b5b | 460 | ts_failure_info[i].code)) { |
0f113f3e | 461 | if (!first) |
0704343f | 462 | strcat(failure_text, ","); |
0f113f3e MC |
463 | else |
464 | first = 0; | |
9c422b5b | 465 | strcat(failure_text, ts_failure_info[i].text); |
0f113f3e MC |
466 | } |
467 | } | |
468 | } | |
469 | if (failure_text[0] == '\0') | |
470 | strcpy(failure_text, "unspecified"); | |
471 | ||
0f113f3e MC |
472 | TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN); |
473 | ERR_add_error_data(6, | |
474 | "status code: ", status_text, | |
475 | ", status text: ", embedded_status_text ? | |
476 | embedded_status_text : "unspecified", | |
477 | ", failure codes: ", failure_text); | |
478 | OPENSSL_free(embedded_status_text); | |
479 | ||
480 | return 0; | |
481 | } | |
c7235be6 | 482 | |
9c422b5b | 483 | static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text) |
0f113f3e MC |
484 | { |
485 | int i; | |
486 | unsigned int length = 0; | |
487 | char *result = NULL; | |
488 | char *p; | |
489 | ||
0f113f3e MC |
490 | for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
491 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
492 | length += ASN1_STRING_length(current); | |
493 | length += 1; /* separator character */ | |
494 | } | |
75ebbd9a | 495 | if ((result = OPENSSL_malloc(length)) == NULL) { |
0f113f3e MC |
496 | TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE); |
497 | return NULL; | |
498 | } | |
18cd23df | 499 | |
0f113f3e MC |
500 | for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) { |
501 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
502 | length = ASN1_STRING_length(current); | |
503 | if (i > 0) | |
504 | *p++ = '/'; | |
505 | strncpy(p, (const char *)ASN1_STRING_data(current), length); | |
506 | p += length; | |
507 | } | |
0f113f3e MC |
508 | *p = '\0'; |
509 | ||
510 | return result; | |
511 | } | |
c7235be6 | 512 | |
9c422b5b | 513 | static int ts_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info) |
0f113f3e | 514 | { |
ca4a494c | 515 | ASN1_OBJECT *resp_oid = tst_info->policy_id; |
c7235be6 | 516 | |
0f113f3e MC |
517 | if (OBJ_cmp(req_oid, resp_oid) != 0) { |
518 | TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH); | |
519 | return 0; | |
520 | } | |
c7235be6 | 521 | |
0f113f3e MC |
522 | return 1; |
523 | } | |
c7235be6 | 524 | |
9c422b5b | 525 | static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info, |
0f113f3e MC |
526 | X509_ALGOR **md_alg, |
527 | unsigned char **imprint, unsigned *imprint_len) | |
528 | { | |
ca4a494c RS |
529 | TS_MSG_IMPRINT *msg_imprint = tst_info->msg_imprint; |
530 | X509_ALGOR *md_alg_resp = msg_imprint->hash_algo; | |
0f113f3e | 531 | const EVP_MD *md; |
6e59a892 | 532 | EVP_MD_CTX *md_ctx = NULL; |
0f113f3e MC |
533 | unsigned char buffer[4096]; |
534 | int length; | |
535 | ||
536 | *md_alg = NULL; | |
537 | *imprint = NULL; | |
538 | ||
75ebbd9a | 539 | if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL) |
0f113f3e | 540 | goto err; |
75ebbd9a | 541 | if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) { |
0f113f3e MC |
542 | TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM); |
543 | goto err; | |
544 | } | |
0f113f3e MC |
545 | length = EVP_MD_size(md); |
546 | if (length < 0) | |
547 | goto err; | |
548 | *imprint_len = length; | |
75ebbd9a | 549 | if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) { |
0f113f3e MC |
550 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); |
551 | goto err; | |
552 | } | |
553 | ||
bfb0641f | 554 | md_ctx = EVP_MD_CTX_new(); |
6e59a892 RL |
555 | if (md_ctx == NULL) { |
556 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); | |
557 | goto err; | |
558 | } | |
559 | if (!EVP_DigestInit(md_ctx, md)) | |
0f113f3e MC |
560 | goto err; |
561 | while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) { | |
6e59a892 | 562 | if (!EVP_DigestUpdate(md_ctx, buffer, length)) |
0f113f3e MC |
563 | goto err; |
564 | } | |
6e59a892 | 565 | if (!EVP_DigestFinal(md_ctx, *imprint, NULL)) |
0f113f3e | 566 | goto err; |
bfb0641f | 567 | EVP_MD_CTX_free(md_ctx); |
0f113f3e MC |
568 | |
569 | return 1; | |
c7235be6 | 570 | err: |
bfb0641f | 571 | EVP_MD_CTX_free(md_ctx); |
0f113f3e MC |
572 | X509_ALGOR_free(*md_alg); |
573 | OPENSSL_free(*imprint); | |
574 | *imprint_len = 0; | |
575 | *imprint = 0; | |
576 | return 0; | |
577 | } | |
578 | ||
9c422b5b | 579 | static int ts_check_imprints(X509_ALGOR *algor_a, |
0f113f3e MC |
580 | unsigned char *imprint_a, unsigned len_a, |
581 | TS_TST_INFO *tst_info) | |
582 | { | |
ca4a494c RS |
583 | TS_MSG_IMPRINT *b = tst_info->msg_imprint; |
584 | X509_ALGOR *algor_b = b->hash_algo; | |
0f113f3e MC |
585 | int ret = 0; |
586 | ||
0f113f3e | 587 | if (algor_a) { |
0f113f3e MC |
588 | if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm)) |
589 | goto err; | |
590 | ||
591 | /* The parameter must be NULL in both. */ | |
592 | if ((algor_a->parameter | |
593 | && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) | |
594 | || (algor_b->parameter | |
595 | && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL)) | |
596 | goto err; | |
597 | } | |
598 | ||
0f113f3e MC |
599 | ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) && |
600 | memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0; | |
c7235be6 | 601 | err: |
0f113f3e MC |
602 | if (!ret) |
603 | TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH); | |
604 | return ret; | |
605 | } | |
c7235be6 | 606 | |
9c422b5b | 607 | static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info) |
0f113f3e | 608 | { |
ca4a494c | 609 | const ASN1_INTEGER *b = tst_info->nonce; |
0f113f3e | 610 | |
0f113f3e MC |
611 | if (!b) { |
612 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /* No error if a nonce is returned without being requested. */ | |
617 | if (ASN1_INTEGER_cmp(a, b) != 0) { | |
618 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH); | |
619 | return 0; | |
620 | } | |
621 | ||
622 | return 1; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Check if the specified TSA name matches either the subject or one of the | |
627 | * subject alternative names of the TSA certificate. | |
628 | */ | |
9c422b5b | 629 | static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer) |
0f113f3e MC |
630 | { |
631 | STACK_OF(GENERAL_NAME) *gen_names = NULL; | |
632 | int idx = -1; | |
633 | int found = 0; | |
634 | ||
0f113f3e | 635 | if (tsa_name->type == GEN_DIRNAME |
a8d8e06b | 636 | && X509_name_cmp(tsa_name->d.dirn, X509_get_subject_name(signer)) == 0) |
0f113f3e | 637 | return 1; |
0f113f3e | 638 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); |
75ebbd9a | 639 | while (gen_names != NULL) { |
9c422b5b | 640 | found = ts_find_name(gen_names, tsa_name) >= 0; |
75ebbd9a RS |
641 | if (found) |
642 | break; | |
0f113f3e MC |
643 | /* |
644 | * Get the next subject alternative name, although there should be no | |
645 | * more than one. | |
646 | */ | |
647 | GENERAL_NAMES_free(gen_names); | |
75ebbd9a | 648 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx); |
0f113f3e | 649 | } |
25aaa98a | 650 | GENERAL_NAMES_free(gen_names); |
0f113f3e MC |
651 | |
652 | return found; | |
653 | } | |
c7235be6 UM |
654 | |
655 | /* Returns 1 if name is in gen_names, 0 otherwise. */ | |
9c422b5b | 656 | static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name) |
0f113f3e MC |
657 | { |
658 | int i, found; | |
659 | for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) { | |
660 | GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i); | |
661 | found = GENERAL_NAME_cmp(current, name) == 0; | |
662 | } | |
663 | return found ? i - 1 : -1; | |
664 | } |