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c7235be6 UM |
1 | /* crypto/ts/ts_resp_verify.c */ |
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 "cryptlib.h" | |
61 | #include <openssl/objects.h> | |
62 | #include <openssl/ts.h> | |
63 | #include <openssl/pkcs7.h> | |
64 | ||
65 | /* Private function declarations. */ | |
66 | ||
67 | static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, | |
68 | X509 *signer, STACK_OF(X509) **chain); | |
69 | static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain); | |
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); | |
72 | static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo); | |
a291745e | 73 | static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, |
c7235be6 UM |
74 | PKCS7 *token, TS_TST_INFO *tst_info); |
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, | |
79 | X509_ALGOR **md_alg, | |
80 | unsigned char **imprint, unsigned *imprint_len); | |
81 | static int TS_check_imprints(X509_ALGOR *algor_a, | |
82 | unsigned char *imprint_a, unsigned len_a, | |
83 | TS_TST_INFO *tst_info); | |
6c73d011 | 84 | static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info); |
c7235be6 UM |
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, GENERAL_NAME *name); | |
87 | ||
88 | /* | |
89 | * Local mapping between response codes and descriptions. | |
90 | * Don't forget to change TS_STATUS_BUF_SIZE when modifying | |
91 | * the elements of this array. | |
92 | */ | |
93 | static const char *TS_status_text[] = | |
94 | { "granted", | |
95 | "grantedWithMods", | |
96 | "rejection", | |
97 | "waiting", | |
98 | "revocationWarning", | |
99 | "revocationNotification" }; | |
100 | ||
101 | #define TS_STATUS_TEXT_SIZE (sizeof(TS_status_text)/sizeof(*TS_status_text)) | |
102 | ||
103 | /* | |
104 | * This must be greater or equal to the sum of the strings in TS_status_text | |
105 | * plus the number of its elements. | |
106 | */ | |
107 | #define TS_STATUS_BUF_SIZE 256 | |
108 | ||
109 | static struct | |
110 | { | |
111 | int code; | |
112 | const char *text; | |
113 | } TS_failure_info[] = | |
114 | { { TS_INFO_BAD_ALG, "badAlg" }, | |
115 | { TS_INFO_BAD_REQUEST, "badRequest" }, | |
116 | { TS_INFO_BAD_DATA_FORMAT, "badDataFormat" }, | |
117 | { TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable" }, | |
118 | { TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy" }, | |
119 | { TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension" }, | |
120 | { TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable" }, | |
121 | { TS_INFO_SYSTEM_FAILURE, "systemFailure" } }; | |
122 | ||
123 | #define TS_FAILURE_INFO_SIZE (sizeof(TS_failure_info) / \ | |
124 | sizeof(*TS_failure_info)) | |
125 | ||
126 | /* Functions for verifying a signed TS_TST_INFO structure. */ | |
127 | ||
128 | /* | |
129 | * This function carries out the following tasks: | |
130 | * - Checks if there is one and only one signer. | |
131 | * - Search for the signing certificate in 'certs' and in the response. | |
132 | * - Check the extended key usage and key usage fields of the signer | |
133 | * certificate (done by the path validation). | |
134 | * - Build and validate the certificate path. | |
135 | * - Check if the certificate path meets the requirements of the | |
136 | * SigningCertificate ESS signed attribute. | |
137 | * - Verify the signature value. | |
138 | * - Returns the signer certificate in 'signer', if 'signer' is not NULL. | |
139 | */ | |
140 | int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs, | |
141 | X509_STORE *store, X509 **signer_out) | |
142 | { | |
143 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL; | |
144 | PKCS7_SIGNER_INFO *si; | |
145 | STACK_OF(X509) *signers = NULL; | |
146 | X509 *signer; | |
147 | STACK_OF(X509) *chain = NULL; | |
148 | char buf[4096]; | |
149 | int i, j = 0, ret = 0; | |
150 | BIO *p7bio = NULL; | |
151 | ||
152 | /* Some sanity checks first. */ | |
153 | if (!token) | |
154 | { | |
155 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER); | |
156 | goto err; | |
157 | } | |
158 | ||
159 | /* Check for the correct content type */ | |
160 | if(!PKCS7_type_is_signed(token)) | |
161 | { | |
162 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE); | |
163 | goto err; | |
164 | } | |
165 | ||
166 | /* Check if there is one and only one signer. */ | |
167 | sinfos = PKCS7_get_signer_info(token); | |
168 | if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) | |
169 | { | |
170 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, | |
171 | TS_R_THERE_MUST_BE_ONE_SIGNER); | |
172 | goto err; | |
173 | } | |
174 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0); | |
175 | ||
176 | /* Check for no content: no data to verify signature. */ | |
177 | if (PKCS7_get_detached(token)) | |
178 | { | |
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) goto err; | |
187 | signer = sk_X509_value(signers, 0); | |
188 | ||
189 | /* Now verify the certificate. */ | |
190 | if (!TS_verify_cert(store, certs, signer, &chain)) goto err; | |
191 | ||
192 | /* Check if the signer certificate is consistent with the | |
193 | ESS extension. */ | |
194 | if (!TS_check_signing_certs(si, chain)) goto err; | |
195 | ||
196 | /* Creating the message digest. */ | |
197 | p7bio = PKCS7_dataInit(token, NULL); | |
198 | ||
199 | /* We now have to 'read' from p7bio to calculate digests etc. */ | |
200 | while ((i = BIO_read(p7bio,buf,sizeof(buf))) > 0); | |
201 | ||
202 | /* Verifying the signature. */ | |
203 | j = PKCS7_signatureVerify(p7bio, token, si, signer); | |
204 | if (j <= 0) | |
205 | { | |
206 | TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE); | |
207 | goto err; | |
208 | } | |
209 | ||
210 | /* Return the signer certificate if needed. */ | |
211 | if (signer_out) | |
212 | { | |
213 | *signer_out = signer; | |
214 | CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509); | |
215 | } | |
216 | ||
217 | ret = 1; | |
218 | ||
219 | err: | |
220 | BIO_free_all(p7bio); | |
221 | sk_X509_pop_free(chain, X509_free); | |
222 | sk_X509_free(signers); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * The certificate chain is returned in chain. Caller is responsible for | |
229 | * freeing the vector. | |
230 | */ | |
231 | static int TS_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted, | |
232 | X509 *signer, STACK_OF(X509) **chain) | |
233 | { | |
234 | X509_STORE_CTX cert_ctx; | |
235 | int i; | |
236 | int ret = 1; | |
237 | ||
238 | /* chain is an out argument. */ | |
239 | *chain = NULL; | |
240 | X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted); | |
241 | X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN); | |
242 | i = X509_verify_cert(&cert_ctx); | |
243 | if (i <= 0) | |
244 | { | |
245 | int j = X509_STORE_CTX_get_error(&cert_ctx); | |
246 | TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR); | |
247 | ERR_add_error_data(2, "Verify error:", | |
248 | X509_verify_cert_error_string(j)); | |
249 | ret = 0; | |
250 | } | |
251 | else | |
252 | { | |
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 | ||
262 | static int TS_check_signing_certs(PKCS7_SIGNER_INFO *si, STACK_OF(X509) *chain) | |
263 | { | |
264 | ESS_SIGNING_CERT *ss = ESS_get_signing_cert(si); | |
265 | STACK_OF(ESS_CERT_ID) *cert_ids = NULL; | |
266 | X509 *cert; | |
267 | int i = 0; | |
268 | int ret = 0; | |
269 | ||
270 | if (!ss) goto err; | |
271 | cert_ids = ss->cert_ids; | |
272 | /* The signer certificate must be the first in cert_ids. */ | |
273 | cert = sk_X509_value(chain, 0); | |
274 | if (TS_find_cert(cert_ids, cert) != 0) goto err; | |
275 | ||
276 | /* Check the other certificates of the chain if there are more | |
277 | than one certificate ids in cert_ids. */ | |
278 | if (sk_ESS_CERT_ID_num(cert_ids) > 1) | |
279 | { | |
280 | /* All the certificates of the chain must be in cert_ids. */ | |
281 | for (i = 1; i < sk_X509_num(chain); ++i) | |
282 | { | |
283 | cert = sk_X509_value(chain, i); | |
284 | if (TS_find_cert(cert_ids, cert) < 0) goto err; | |
285 | } | |
286 | } | |
287 | ret = 1; | |
288 | err: | |
289 | if (!ret) | |
290 | TSerr(TS_F_TS_CHECK_SIGNING_CERTS, | |
291 | TS_R_ESS_SIGNING_CERTIFICATE_ERROR); | |
292 | ESS_SIGNING_CERT_free(ss); | |
293 | return ret; | |
294 | } | |
295 | ||
296 | static ESS_SIGNING_CERT *ESS_get_signing_cert(PKCS7_SIGNER_INFO *si) | |
297 | { | |
298 | ASN1_TYPE *attr; | |
299 | const unsigned char *p; | |
300 | attr = PKCS7_get_signed_attribute(si, | |
301 | NID_id_smime_aa_signingCertificate); | |
302 | if (!attr) return NULL; | |
303 | p = attr->value.sequence->data; | |
304 | return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length); | |
305 | } | |
306 | ||
307 | /* Returns < 0 if certificate is not found, certificate index otherwise. */ | |
308 | static int TS_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert) | |
309 | { | |
310 | int i; | |
311 | ||
312 | if (!cert_ids || !cert) return -1; | |
313 | ||
314 | /* Recompute SHA1 hash of certificate if necessary (side effect). */ | |
315 | X509_check_purpose(cert, -1, 0); | |
316 | ||
317 | /* Look for cert in the cert_ids vector. */ | |
318 | for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) | |
319 | { | |
320 | ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i); | |
321 | ||
322 | /* Check the SHA-1 hash first. */ | |
323 | if (cid->hash->length == sizeof(cert->sha1_hash) | |
324 | && !memcmp(cid->hash->data, cert->sha1_hash, | |
325 | sizeof(cert->sha1_hash))) | |
326 | { | |
327 | /* Check the issuer/serial as well if specified. */ | |
328 | ESS_ISSUER_SERIAL *is = cid->issuer_serial; | |
329 | if (!is || !TS_issuer_serial_cmp(is, cert->cert_info)) | |
330 | return i; | |
331 | } | |
332 | } | |
333 | ||
334 | return -1; | |
335 | } | |
336 | ||
337 | static int TS_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo) | |
338 | { | |
339 | GENERAL_NAME *issuer; | |
340 | ||
341 | if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1) return -1; | |
342 | ||
343 | /* Check the issuer first. It must be a directory name. */ | |
344 | issuer = sk_GENERAL_NAME_value(is->issuer, 0); | |
345 | if (issuer->type != GEN_DIRNAME | |
346 | || X509_NAME_cmp(issuer->d.dirn, cinfo->issuer)) | |
347 | return -1; | |
348 | ||
349 | /* Check the serial number, too. */ | |
350 | if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber)) | |
351 | return -1; | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Verifies whether 'response' contains a valid response with regards | |
358 | * to the settings of the context: | |
359 | * - Gives an error message if the TS_TST_INFO is not present. | |
360 | * - Calls _TS_RESP_verify_token to verify the token content. | |
361 | */ | |
362 | int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response) | |
363 | { | |
364 | PKCS7 *token = TS_RESP_get_token(response); | |
365 | TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response); | |
366 | int ret = 0; | |
367 | ||
368 | /* Check if we have a successful TS_TST_INFO object in place. */ | |
369 | if (!TS_check_status_info(response)) goto err; | |
370 | ||
371 | /* Check the contents of the time stamp token. */ | |
a291745e | 372 | if (!int_TS_RESP_verify_token(ctx, token, tst_info)) |
c7235be6 UM |
373 | goto err; |
374 | ||
375 | ret = 1; | |
376 | err: | |
377 | return ret; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Tries to extract a TS_TST_INFO structure from the PKCS7 token and | |
a291745e | 382 | * calls the internal int_TS_RESP_verify_token function for verifying it. |
c7235be6 UM |
383 | */ |
384 | int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token) | |
385 | { | |
386 | TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token); | |
387 | int ret = 0; | |
388 | if (tst_info) | |
389 | { | |
a291745e | 390 | ret = int_TS_RESP_verify_token(ctx, token, tst_info); |
c7235be6 UM |
391 | TS_TST_INFO_free(tst_info); |
392 | } | |
393 | return ret; | |
394 | } | |
395 | ||
6977c7e2 | 396 | /*- |
c7235be6 UM |
397 | * Verifies whether the 'token' contains a valid time stamp token |
398 | * with regards to the settings of the context. Only those checks are | |
399 | * carried out that are specified in the context: | |
400 | * - Verifies the signature of the TS_TST_INFO. | |
401 | * - Checks the version number of the response. | |
402 | * - Check if the requested and returned policies math. | |
403 | * - Check if the message imprints are the same. | |
404 | * - Check if the nonces are the same. | |
405 | * - Check if the TSA name matches the signer. | |
406 | * - Check if the TSA name is the expected TSA. | |
407 | */ | |
a291745e | 408 | static int int_TS_RESP_verify_token(TS_VERIFY_CTX *ctx, |
c7235be6 UM |
409 | PKCS7 *token, TS_TST_INFO *tst_info) |
410 | { | |
411 | X509 *signer = NULL; | |
412 | GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info); | |
413 | X509_ALGOR *md_alg = NULL; | |
414 | unsigned char *imprint = NULL; | |
415 | unsigned imprint_len = 0; | |
416 | int ret = 0; | |
417 | ||
418 | /* Verify the signature. */ | |
419 | if ((ctx->flags & TS_VFY_SIGNATURE) | |
420 | && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, | |
421 | &signer)) | |
422 | goto err; | |
423 | ||
424 | /* Check version number of response. */ | |
425 | if ((ctx->flags & TS_VFY_VERSION) | |
426 | && TS_TST_INFO_get_version(tst_info) != 1) | |
427 | { | |
a291745e | 428 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION); |
c7235be6 UM |
429 | goto err; |
430 | } | |
431 | ||
432 | /* Check policies. */ | |
433 | if ((ctx->flags & TS_VFY_POLICY) | |
434 | && !TS_check_policy(ctx->policy, tst_info)) | |
435 | goto err; | |
436 | ||
437 | /* Check message imprints. */ | |
438 | if ((ctx->flags & TS_VFY_IMPRINT) | |
439 | && !TS_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len, | |
440 | tst_info)) | |
441 | goto err; | |
442 | ||
443 | /* Compute and check message imprints. */ | |
444 | if ((ctx->flags & TS_VFY_DATA) | |
445 | && (!TS_compute_imprint(ctx->data, tst_info, | |
446 | &md_alg, &imprint, &imprint_len) | |
447 | || !TS_check_imprints(md_alg, imprint, imprint_len, tst_info))) | |
448 | goto err; | |
449 | ||
450 | /* Check nonces. */ | |
451 | if ((ctx->flags & TS_VFY_NONCE) | |
452 | && !TS_check_nonces(ctx->nonce, tst_info)) | |
453 | goto err; | |
454 | ||
455 | /* Check whether TSA name and signer certificate match. */ | |
456 | if ((ctx->flags & TS_VFY_SIGNER) | |
457 | && tsa_name && !TS_check_signer_name(tsa_name, signer)) | |
458 | { | |
a291745e | 459 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH); |
c7235be6 UM |
460 | goto err; |
461 | } | |
462 | ||
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 | { | |
a291745e | 467 | TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED); |
c7235be6 UM |
468 | goto err; |
469 | } | |
470 | ||
471 | ret = 1; | |
472 | err: | |
473 | X509_free(signer); | |
474 | X509_ALGOR_free(md_alg); | |
475 | OPENSSL_free(imprint); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | static int TS_check_status_info(TS_RESP *response) | |
480 | { | |
481 | TS_STATUS_INFO *info = TS_RESP_get_status_info(response); | |
482 | long status = ASN1_INTEGER_get(info->status); | |
483 | const char *status_text = NULL; | |
484 | char *embedded_status_text = NULL; | |
485 | char failure_text[TS_STATUS_BUF_SIZE] = ""; | |
486 | ||
487 | /* Check if everything went fine. */ | |
488 | if (status == 0 || status == 1) return 1; | |
489 | ||
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]; | |
493 | else | |
494 | status_text = "unknown code"; | |
495 | ||
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))) | |
499 | return 0; | |
500 | ||
501 | /* Filling in failure_text with the failure information. */ | |
502 | if (info->failure_info) | |
503 | { | |
504 | int i; | |
505 | int first = 1; | |
506 | for (i = 0; i < (int)TS_FAILURE_INFO_SIZE; ++i) | |
507 | { | |
508 | if (ASN1_BIT_STRING_get_bit(info->failure_info, | |
509 | TS_failure_info[i].code)) | |
510 | { | |
511 | if (!first) | |
512 | strcpy(failure_text, ","); | |
513 | else | |
514 | first = 0; | |
515 | strcat(failure_text, TS_failure_info[i].text); | |
516 | } | |
517 | } | |
518 | } | |
519 | if (failure_text[0] == '\0') | |
520 | strcpy(failure_text, "unspecified"); | |
521 | ||
522 | /* Making up the error string. */ | |
523 | TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN); | |
524 | ERR_add_error_data(6, | |
525 | "status code: ", status_text, | |
526 | ", status text: ", embedded_status_text ? | |
527 | embedded_status_text : "unspecified", | |
528 | ", failure codes: ", failure_text); | |
529 | OPENSSL_free(embedded_status_text); | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | static char *TS_get_status_text(STACK_OF(ASN1_UTF8STRING) *text) | |
535 | { | |
536 | int i; | |
537 | unsigned int length = 0; | |
538 | char *result = NULL; | |
539 | char *p; | |
540 | ||
541 | /* Determine length first. */ | |
542 | for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) | |
543 | { | |
544 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
545 | length += ASN1_STRING_length(current); | |
546 | length += 1; /* separator character */ | |
547 | } | |
548 | /* Allocate memory (closing '\0' included). */ | |
549 | if (!(result = OPENSSL_malloc(length))) | |
550 | { | |
551 | TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE); | |
552 | return NULL; | |
553 | } | |
554 | /* Concatenate the descriptions. */ | |
555 | for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) | |
556 | { | |
557 | ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i); | |
558 | length = ASN1_STRING_length(current); | |
559 | if (i > 0) *p++ = '/'; | |
560 | strncpy(p, (const char *)ASN1_STRING_data(current), length); | |
561 | p += length; | |
562 | } | |
563 | /* We do have space for this, too. */ | |
564 | *p = '\0'; | |
565 | ||
566 | return result; | |
567 | } | |
568 | ||
569 | static int TS_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info) | |
570 | { | |
571 | ASN1_OBJECT *resp_oid = TS_TST_INFO_get_policy_id(tst_info); | |
572 | ||
573 | if (OBJ_cmp(req_oid, resp_oid) != 0) | |
574 | { | |
575 | TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | return 1; | |
580 | } | |
581 | ||
582 | static int TS_compute_imprint(BIO *data, TS_TST_INFO *tst_info, | |
583 | X509_ALGOR **md_alg, | |
584 | unsigned char **imprint, unsigned *imprint_len) | |
585 | { | |
586 | TS_MSG_IMPRINT *msg_imprint = TS_TST_INFO_get_msg_imprint(tst_info); | |
587 | X509_ALGOR *md_alg_resp = TS_MSG_IMPRINT_get_algo(msg_imprint); | |
588 | const EVP_MD *md; | |
589 | EVP_MD_CTX md_ctx; | |
590 | unsigned char buffer[4096]; | |
591 | int length; | |
592 | ||
593 | *md_alg = NULL; | |
594 | *imprint = NULL; | |
595 | ||
596 | /* Return the MD algorithm of the response. */ | |
597 | if (!(*md_alg = X509_ALGOR_dup(md_alg_resp))) goto err; | |
598 | ||
599 | /* Getting the MD object. */ | |
600 | if (!(md = EVP_get_digestbyobj((*md_alg)->algorithm))) | |
601 | { | |
602 | TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM); | |
603 | goto err; | |
604 | } | |
605 | ||
606 | /* Compute message digest. */ | |
0eab41fb BL |
607 | length = EVP_MD_size(md); |
608 | if (length < 0) | |
609 | goto err; | |
610 | *imprint_len = length; | |
c7235be6 UM |
611 | if (!(*imprint = OPENSSL_malloc(*imprint_len))) |
612 | { | |
613 | TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE); | |
614 | goto err; | |
615 | } | |
616 | ||
24d7159a DSH |
617 | if (!EVP_DigestInit(&md_ctx, md)) |
618 | goto err; | |
c7235be6 UM |
619 | while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) |
620 | { | |
24d7159a DSH |
621 | if (!EVP_DigestUpdate(&md_ctx, buffer, length)) |
622 | goto err; | |
c7235be6 | 623 | } |
24d7159a DSH |
624 | if (!EVP_DigestFinal(&md_ctx, *imprint, NULL)) |
625 | goto err; | |
c7235be6 UM |
626 | |
627 | return 1; | |
628 | err: | |
629 | X509_ALGOR_free(*md_alg); | |
630 | OPENSSL_free(*imprint); | |
631 | *imprint_len = 0; | |
3b21abfd | 632 | *imprint = 0; |
c7235be6 UM |
633 | return 0; |
634 | } | |
635 | ||
636 | static int TS_check_imprints(X509_ALGOR *algor_a, | |
637 | unsigned char *imprint_a, unsigned len_a, | |
638 | TS_TST_INFO *tst_info) | |
639 | { | |
640 | TS_MSG_IMPRINT *b = TS_TST_INFO_get_msg_imprint(tst_info); | |
641 | X509_ALGOR *algor_b = TS_MSG_IMPRINT_get_algo(b); | |
642 | int ret = 0; | |
643 | ||
644 | /* algor_a is optional. */ | |
645 | if (algor_a) | |
646 | { | |
647 | /* Compare algorithm OIDs. */ | |
648 | if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm)) goto err; | |
649 | ||
650 | /* The parameter must be NULL in both. */ | |
651 | if ((algor_a->parameter | |
652 | && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL) | |
653 | || (algor_b->parameter | |
654 | && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL)) | |
655 | goto err; | |
656 | } | |
657 | ||
658 | /* Compare octet strings. */ | |
659 | ret = len_a == (unsigned) ASN1_STRING_length(b->hashed_msg) && | |
660 | memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0; | |
661 | err: | |
662 | if (!ret) | |
663 | TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH); | |
664 | return ret; | |
665 | } | |
666 | ||
6c73d011 | 667 | static int TS_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info) |
c7235be6 | 668 | { |
6c73d011 | 669 | const ASN1_INTEGER *b = TS_TST_INFO_get_nonce(tst_info); |
c7235be6 UM |
670 | |
671 | /* Error if nonce is missing. */ | |
672 | if (!b) | |
673 | { | |
674 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED); | |
675 | return 0; | |
676 | } | |
677 | ||
678 | /* No error if a nonce is returned without being requested. */ | |
679 | if (ASN1_INTEGER_cmp(a, b) != 0) | |
680 | { | |
681 | TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | return 1; | |
686 | } | |
687 | ||
688 | /* Check if the specified TSA name matches either the subject | |
689 | or one of the subject alternative names of the TSA certificate. */ | |
690 | static int TS_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer) | |
691 | { | |
692 | STACK_OF(GENERAL_NAME) *gen_names = NULL; | |
693 | int idx = -1; | |
694 | int found = 0; | |
695 | ||
696 | /* Check the subject name first. */ | |
697 | if (tsa_name->type == GEN_DIRNAME | |
698 | && X509_name_cmp(tsa_name->d.dirn, signer->cert_info->subject) == 0) | |
699 | return 1; | |
700 | ||
701 | /* Check all the alternative names. */ | |
702 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, | |
703 | NULL, &idx); | |
704 | while (gen_names != NULL | |
705 | && !(found = TS_find_name(gen_names, tsa_name) >= 0)) | |
706 | { | |
707 | /* Get the next subject alternative name, | |
708 | although there should be no more than one. */ | |
709 | GENERAL_NAMES_free(gen_names); | |
710 | gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, | |
711 | NULL, &idx); | |
712 | } | |
713 | if (gen_names) GENERAL_NAMES_free(gen_names); | |
714 | ||
715 | return found; | |
716 | } | |
717 | ||
718 | /* Returns 1 if name is in gen_names, 0 otherwise. */ | |
719 | static int TS_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name) | |
720 | { | |
721 | int i, found; | |
722 | for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); | |
723 | ++i) | |
724 | { | |
725 | GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i); | |
726 | found = GENERAL_NAME_cmp(current, name) == 0; | |
727 | } | |
728 | return found ? i - 1 : -1; | |
729 | } |