3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/ocsp.h>
61 #include <openssl/err.h>
64 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
65 STACK_OF(X509) *certs, X509_STORE *st,
67 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
68 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
70 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp,
72 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
73 STACK_OF(OCSP_SINGLERESP) *sresp);
74 static int ocsp_check_delegated(X509 *x, int flags);
75 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
76 X509_NAME *nm, STACK_OF(X509) *certs,
77 X509_STORE *st, unsigned long flags);
79 /* Verify a basic response message */
81 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
82 X509_STORE *st, unsigned long flags)
85 STACK_OF(X509) *chain = NULL;
88 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
90 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
91 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
94 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
95 flags |= OCSP_NOVERIFY;
96 if (!(flags & OCSP_NOSIGS)) {
98 skey = X509_get_pubkey(signer);
100 ret = OCSP_BASICRESP_verify(bs, skey, 0);
103 if (!skey || ret <= 0) {
104 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
108 if (!(flags & OCSP_NOVERIFY)) {
110 if (flags & OCSP_NOCHAIN)
111 init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL);
113 init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
116 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
120 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
121 ret = X509_verify_cert(&ctx);
122 chain = X509_STORE_CTX_get1_chain(&ctx);
123 X509_STORE_CTX_cleanup(&ctx);
125 i = X509_STORE_CTX_get_error(&ctx);
126 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
127 OCSP_R_CERTIFICATE_VERIFY_ERROR);
128 ERR_add_error_data(2, "Verify error:",
129 X509_verify_cert_error_string(i));
132 if (flags & OCSP_NOCHECKS) {
137 * At this point we have a valid certificate chain need to verify it
138 * against the OCSP issuer criteria.
140 ret = ocsp_check_issuer(bs, chain, flags);
142 /* If fatal error or valid match then finish */
147 * Easy case: explicitly trusted. Get root CA and check for explicit
150 if (flags & OCSP_NOEXPLICIT)
153 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
154 if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
155 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
163 sk_X509_pop_free(chain, X509_free);
167 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
168 STACK_OF(X509) *certs, X509_STORE *st,
172 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
173 if ((signer = ocsp_find_signer_sk(certs, rid))) {
177 if (!(flags & OCSP_NOINTERN) &&
178 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
182 /* Maybe lookup from store if by subject name */
188 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
191 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
194 /* Easy if lookup by name */
195 if (id->type == V_OCSP_RESPID_NAME)
196 return X509_find_by_subject(certs, id->value.byName);
198 /* Lookup by key hash */
200 /* If key hash isn't SHA1 length then forget it */
201 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
203 keyhash = id->value.byKey->data;
204 /* Calculate hash of each key and compare */
205 for (i = 0; i < sk_X509_num(certs); i++) {
206 x = sk_X509_value(certs, i);
207 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
208 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
214 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
217 STACK_OF(OCSP_SINGLERESP) *sresp;
219 OCSP_CERTID *caid = NULL;
221 sresp = bs->tbsResponseData->responses;
223 if (sk_X509_num(chain) <= 0) {
224 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
228 /* See if the issuer IDs match. */
229 i = ocsp_check_ids(sresp, &caid);
231 /* If ID mismatch or other error then return */
235 signer = sk_X509_value(chain, 0);
236 /* Check to see if OCSP responder CA matches request CA */
237 if (sk_X509_num(chain) > 1) {
238 sca = sk_X509_value(chain, 1);
239 i = ocsp_match_issuerid(sca, caid, sresp);
243 /* We have a match, if extensions OK then success */
244 if (ocsp_check_delegated(signer, flags))
250 /* Otherwise check if OCSP request signed directly by request CA */
251 return ocsp_match_issuerid(signer, caid, sresp);
255 * Check the issuer certificate IDs for equality. If there is a mismatch with
256 * the same algorithm then there's no point trying to match any certificates
257 * against the issuer. If the issuer IDs all match then we just need to check
258 * equality against one of them.
261 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
263 OCSP_CERTID *tmpid, *cid;
266 idcount = sk_OCSP_SINGLERESP_num(sresp);
268 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
269 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
273 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
277 for (i = 1; i < idcount; i++) {
278 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
279 /* Check to see if IDs match */
280 if (OCSP_id_issuer_cmp(cid, tmpid)) {
281 /* If algoritm mismatch let caller deal with it */
282 if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
283 cid->hashAlgorithm->algorithm))
290 /* All IDs match: only need to check one ID */
295 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
296 STACK_OF(OCSP_SINGLERESP) *sresp)
298 /* If only one ID to match then do it */
303 unsigned char md[EVP_MAX_MD_SIZE];
304 if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) {
305 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
306 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
310 mdlen = EVP_MD_size(dgst);
311 if ((cid->issuerNameHash->length != mdlen) ||
312 (cid->issuerKeyHash->length != mdlen))
314 iname = X509_get_subject_name(cert);
315 if (!X509_NAME_digest(iname, dgst, md, NULL))
317 if (memcmp(md, cid->issuerNameHash->data, mdlen))
319 X509_pubkey_digest(cert, EVP_sha1(), md, NULL);
320 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
326 /* We have to match the whole lot */
329 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
330 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
331 ret = ocsp_match_issuerid(cert, tmpid, NULL);
340 static int ocsp_check_delegated(X509 *x, int flags)
342 X509_check_purpose(x, -1, 0);
343 if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN))
345 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
350 * Verify an OCSP request. This is fortunately much easier than OCSP response
351 * verify. Just find the signers certificate and verify it against a given
355 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
356 X509_STORE *store, unsigned long flags)
363 if (!req->optionalSignature) {
364 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
367 gen = req->tbsRequest->requestorName;
368 if (!gen || gen->type != GEN_DIRNAME) {
369 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
370 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
373 nm = gen->d.directoryName;
374 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
376 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
377 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
380 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
381 flags |= OCSP_NOVERIFY;
382 if (!(flags & OCSP_NOSIGS)) {
384 skey = X509_get_pubkey(signer);
385 ret = OCSP_REQUEST_verify(req, skey);
388 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
392 if (!(flags & OCSP_NOVERIFY)) {
394 if (flags & OCSP_NOCHAIN)
395 init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
397 init_res = X509_STORE_CTX_init(&ctx, store, signer,
398 req->optionalSignature->certs);
400 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
404 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
405 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
406 ret = X509_verify_cert(&ctx);
407 X509_STORE_CTX_cleanup(&ctx);
409 ret = X509_STORE_CTX_get_error(&ctx);
410 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
411 OCSP_R_CERTIFICATE_VERIFY_ERROR);
412 ERR_add_error_data(2, "Verify error:",
413 X509_verify_cert_error_string(ret));
420 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
421 X509_NAME *nm, STACK_OF(X509) *certs,
422 X509_STORE *st, unsigned long flags)
425 if (!(flags & OCSP_NOINTERN)) {
426 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
431 signer = X509_find_by_subject(certs, nm);