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diff --git a/src/lib/libcrypto/ocsp/ocsp_vfy.c b/src/lib/libcrypto/ocsp/ocsp_vfy.c
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1/* ocsp_vfy.c */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000-2004 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 <openssl/ocsp.h>
60#include <openssl/err.h>
61#include <string.h>
62
63static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
64 X509_STORE *st, unsigned long flags);
65static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
66static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags);
67static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret);
68static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, STACK_OF(OCSP_SINGLERESP) *sresp);
69static int ocsp_check_delegated(X509 *x, int flags);
70static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
71 X509_STORE *st, unsigned long flags);
72
73/* Verify a basic response message */
74
75int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
76 X509_STORE *st, unsigned long flags)
77 {
78 X509 *signer, *x;
79 STACK_OF(X509) *chain = NULL;
80 X509_STORE_CTX ctx;
81 int i, ret = 0;
82 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
83 if (!ret)
84 {
85 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
86 goto end;
87 }
88 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
89 flags |= OCSP_NOVERIFY;
90 if (!(flags & OCSP_NOSIGS))
91 {
92 EVP_PKEY *skey;
93 skey = X509_get_pubkey(signer);
94 ret = OCSP_BASICRESP_verify(bs, skey, 0);
95 EVP_PKEY_free(skey);
96 if(ret <= 0)
97 {
98 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
99 goto end;
100 }
101 }
102 if (!(flags & OCSP_NOVERIFY))
103 {
104 int init_res;
105 if(flags & OCSP_NOCHAIN)
106 init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL);
107 else
108 init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
109 if(!init_res)
110 {
111 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,ERR_R_X509_LIB);
112 goto end;
113 }
114
115 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
116 ret = X509_verify_cert(&ctx);
117 chain = X509_STORE_CTX_get1_chain(&ctx);
118 X509_STORE_CTX_cleanup(&ctx);
119 if (ret <= 0)
120 {
121 i = X509_STORE_CTX_get_error(&ctx);
122 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
123 ERR_add_error_data(2, "Verify error:",
124 X509_verify_cert_error_string(i));
125 goto end;
126 }
127 if(flags & OCSP_NOCHECKS)
128 {
129 ret = 1;
130 goto end;
131 }
132 /* At this point we have a valid certificate chain
133 * need to verify it against the OCSP issuer criteria.
134 */
135 ret = ocsp_check_issuer(bs, chain, flags);
136
137 /* If fatal error or valid match then finish */
138 if (ret != 0) goto end;
139
140 /* Easy case: explicitly trusted. Get root CA and
141 * check for explicit trust
142 */
143 if(flags & OCSP_NOEXPLICIT) goto end;
144
145 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
146 if(X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED)
147 {
148 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_ROOT_CA_NOT_TRUSTED);
149 goto end;
150 }
151 ret = 1;
152 }
153
154
155
156 end:
157 if(chain) sk_X509_pop_free(chain, X509_free);
158 return ret;
159 }
160
161
162static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
163 X509_STORE *st, unsigned long flags)
164 {
165 X509 *signer;
166 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
167 if ((signer = ocsp_find_signer_sk(certs, rid)))
168 {
169 *psigner = signer;
170 return 2;
171 }
172 if(!(flags & OCSP_NOINTERN) &&
173 (signer = ocsp_find_signer_sk(bs->certs, rid)))
174 {
175 *psigner = signer;
176 return 1;
177 }
178 /* Maybe lookup from store if by subject name */
179
180 *psigner = NULL;
181 return 0;
182 }
183
184
185static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
186 {
187 int i;
188 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
189 X509 *x;
190
191 /* Easy if lookup by name */
192 if (id->type == V_OCSP_RESPID_NAME)
193 return X509_find_by_subject(certs, id->value.byName);
194
195 /* Lookup by key hash */
196
197 /* If key hash isn't SHA1 length then forget it */
198 if (id->value.byKey->length != SHA_DIGEST_LENGTH) return NULL;
199 keyhash = id->value.byKey->data;
200 /* Calculate hash of each key and compare */
201 for (i = 0; i < sk_X509_num(certs); i++)
202 {
203 x = sk_X509_value(certs, i);
204 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
205 if(!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
206 return x;
207 }
208 return NULL;
209 }
210
211
212static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags)
213 {
214 STACK_OF(OCSP_SINGLERESP) *sresp;
215 X509 *signer, *sca;
216 OCSP_CERTID *caid = NULL;
217 int i;
218 sresp = bs->tbsResponseData->responses;
219
220 if (sk_X509_num(chain) <= 0)
221 {
222 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
223 return -1;
224 }
225
226 /* See if the issuer IDs match. */
227 i = ocsp_check_ids(sresp, &caid);
228
229 /* If ID mismatch or other error then return */
230 if (i <= 0) return i;
231
232 signer = sk_X509_value(chain, 0);
233 /* Check to see if OCSP responder CA matches request CA */
234 if (sk_X509_num(chain) > 1)
235 {
236 sca = sk_X509_value(chain, 1);
237 i = ocsp_match_issuerid(sca, caid, sresp);
238 if (i < 0) return i;
239 if (i)
240 {
241 /* We have a match, if extensions OK then success */
242 if (ocsp_check_delegated(signer, flags)) return 1;
243 return 0;
244 }
245 }
246
247 /* Otherwise check if OCSP request signed directly by request CA */
248 return ocsp_match_issuerid(signer, caid, sresp);
249 }
250
251
252/* Check the issuer certificate IDs for equality. If there is a mismatch with the same
253 * algorithm then there's no point trying to match any certificates against the issuer.
254 * If the issuer IDs all match then we just need to check equality against one of them.
255 */
256
257static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
258 {
259 OCSP_CERTID *tmpid, *cid;
260 int i, idcount;
261
262 idcount = sk_OCSP_SINGLERESP_num(sresp);
263 if (idcount <= 0)
264 {
265 OCSPerr(OCSP_F_OCSP_CHECK_IDS, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
266 return -1;
267 }
268
269 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
270
271 *ret = NULL;
272
273 for (i = 1; i < idcount; i++)
274 {
275 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
276 /* Check to see if IDs match */
277 if (OCSP_id_issuer_cmp(cid, tmpid))
278 {
279 /* If algoritm mismatch let caller deal with it */
280 if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
281 cid->hashAlgorithm->algorithm))
282 return 2;
283 /* Else mismatch */
284 return 0;
285 }
286 }
287
288 /* All IDs match: only need to check one ID */
289 *ret = cid;
290 return 1;
291 }
292
293
294static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
295 STACK_OF(OCSP_SINGLERESP) *sresp)
296 {
297 /* If only one ID to match then do it */
298 if(cid)
299 {
300 const EVP_MD *dgst;
301 X509_NAME *iname;
302 int mdlen;
303 unsigned char md[EVP_MAX_MD_SIZE];
304 if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm)))
305 {
306 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, OCSP_R_UNKNOWN_MESSAGE_DIGEST);
307 return -1;
308 }
309
310 mdlen = EVP_MD_size(dgst);
311 if (mdlen < 0)
312 return -1;
313 if ((cid->issuerNameHash->length != mdlen) ||
314 (cid->issuerKeyHash->length != mdlen))
315 return 0;
316 iname = X509_get_subject_name(cert);
317 if (!X509_NAME_digest(iname, dgst, md, NULL))
318 return -1;
319 if (memcmp(md, cid->issuerNameHash->data, mdlen))
320 return 0;
321 X509_pubkey_digest(cert, dgst, md, NULL);
322 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
323 return 0;
324
325 return 1;
326
327 }
328 else
329 {
330 /* We have to match the whole lot */
331 int i, ret;
332 OCSP_CERTID *tmpid;
333 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++)
334 {
335 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
336 ret = ocsp_match_issuerid(cert, tmpid, NULL);
337 if (ret <= 0) return ret;
338 }
339 return 1;
340 }
341
342 }
343
344static int ocsp_check_delegated(X509 *x, int flags)
345 {
346 X509_check_purpose(x, -1, 0);
347 if ((x->ex_flags & EXFLAG_XKUSAGE) &&
348 (x->ex_xkusage & XKU_OCSP_SIGN))
349 return 1;
350 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
351 return 0;
352 }
353
354/* Verify an OCSP request. This is fortunately much easier than OCSP
355 * response verify. Just find the signers certificate and verify it
356 * against a given trust value.
357 */
358
359int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, X509_STORE *store, unsigned long flags)
360 {
361 X509 *signer;
362 X509_NAME *nm;
363 GENERAL_NAME *gen;
364 int ret;
365 X509_STORE_CTX ctx;
366 if (!req->optionalSignature)
367 {
368 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
369 return 0;
370 }
371 gen = req->tbsRequest->requestorName;
372 if (!gen || gen->type != GEN_DIRNAME)
373 {
374 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
375 return 0;
376 }
377 nm = gen->d.directoryName;
378 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
379 if (ret <= 0)
380 {
381 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
382 return 0;
383 }
384 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
385 flags |= OCSP_NOVERIFY;
386 if (!(flags & OCSP_NOSIGS))
387 {
388 EVP_PKEY *skey;
389 skey = X509_get_pubkey(signer);
390 ret = OCSP_REQUEST_verify(req, skey);
391 EVP_PKEY_free(skey);
392 if(ret <= 0)
393 {
394 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
395 return 0;
396 }
397 }
398 if (!(flags & OCSP_NOVERIFY))
399 {
400 int init_res;
401 if(flags & OCSP_NOCHAIN)
402 init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
403 else
404 init_res = X509_STORE_CTX_init(&ctx, store, signer,
405 req->optionalSignature->certs);
406 if(!init_res)
407 {
408 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,ERR_R_X509_LIB);
409 return 0;
410 }
411
412 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
413 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
414 ret = X509_verify_cert(&ctx);
415 X509_STORE_CTX_cleanup(&ctx);
416 if (ret <= 0)
417 {
418 ret = X509_STORE_CTX_get_error(&ctx);
419 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
420 ERR_add_error_data(2, "Verify error:",
421 X509_verify_cert_error_string(ret));
422 return 0;
423 }
424 }
425 return 1;
426 }
427
428static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
429 X509_STORE *st, unsigned long flags)
430 {
431 X509 *signer;
432 if(!(flags & OCSP_NOINTERN))
433 {
434 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
435 *psigner = signer;
436 return 1;
437 }
438
439 signer = X509_find_by_subject(certs, nm);
440 if (signer)
441 {
442 *psigner = signer;
443 return 2;
444 }
445 return 0;
446 }
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