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>
62 #include <openssl/err.h>
65 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
66 STACK_OF(X509) *certs, X509_STORE *st,
68 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
69 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
71 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp,
73 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
74 STACK_OF(OCSP_SINGLERESP) *sresp);
75 static int ocsp_check_delegated(X509 *x, int flags);
76 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
77 X509_NAME *nm, STACK_OF(X509) *certs,
78 X509_STORE *st, unsigned long flags);
80 /* Verify a basic response message */
82 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
83 X509_STORE *st, unsigned long flags)
86 STACK_OF(X509) *chain = NULL;
89 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
91 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
92 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
95 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
96 flags |= OCSP_NOVERIFY;
97 if (!(flags & OCSP_NOSIGS)) {
99 skey = X509_get_pubkey(signer);
101 ret = OCSP_BASICRESP_verify(bs, skey, 0);
104 if (!skey || ret <= 0) {
105 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
109 if (!(flags & OCSP_NOVERIFY)) {
111 if (flags & OCSP_NOCHAIN)
112 init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL);
114 init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
117 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
121 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
122 ret = X509_verify_cert(&ctx);
123 chain = X509_STORE_CTX_get1_chain(&ctx);
124 X509_STORE_CTX_cleanup(&ctx);
126 i = X509_STORE_CTX_get_error(&ctx);
127 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
128 OCSP_R_CERTIFICATE_VERIFY_ERROR);
129 ERR_add_error_data(2, "Verify error:",
130 X509_verify_cert_error_string(i));
133 if (flags & OCSP_NOCHECKS) {
138 * At this point we have a valid certificate chain need to verify it
139 * against the OCSP issuer criteria.
141 ret = ocsp_check_issuer(bs, chain, flags);
143 /* If fatal error or valid match then finish */
148 * Easy case: explicitly trusted. Get root CA and check for explicit
151 if (flags & OCSP_NOEXPLICIT)
154 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
155 if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
156 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
164 sk_X509_pop_free(chain, X509_free);
168 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
169 STACK_OF(X509) *certs, X509_STORE *st,
173 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
174 if ((signer = ocsp_find_signer_sk(certs, rid))) {
178 if (!(flags & OCSP_NOINTERN) &&
179 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
183 /* Maybe lookup from store if by subject name */
189 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
192 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
195 /* Easy if lookup by name */
196 if (id->type == V_OCSP_RESPID_NAME)
197 return X509_find_by_subject(certs, id->value.byName);
199 /* Lookup by key hash */
201 /* If key hash isn't SHA1 length then forget it */
202 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
204 keyhash = id->value.byKey->data;
205 /* Calculate hash of each key and compare */
206 for (i = 0; i < sk_X509_num(certs); i++) {
207 x = sk_X509_value(certs, i);
208 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
209 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
215 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
218 STACK_OF(OCSP_SINGLERESP) *sresp;
220 OCSP_CERTID *caid = NULL;
222 sresp = bs->tbsResponseData->responses;
224 if (sk_X509_num(chain) <= 0) {
225 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
229 /* See if the issuer IDs match. */
230 i = ocsp_check_ids(sresp, &caid);
232 /* If ID mismatch or other error then return */
236 signer = sk_X509_value(chain, 0);
237 /* Check to see if OCSP responder CA matches request CA */
238 if (sk_X509_num(chain) > 1) {
239 sca = sk_X509_value(chain, 1);
240 i = ocsp_match_issuerid(sca, caid, sresp);
244 /* We have a match, if extensions OK then success */
245 if (ocsp_check_delegated(signer, flags))
251 /* Otherwise check if OCSP request signed directly by request CA */
252 return ocsp_match_issuerid(signer, caid, sresp);
256 * Check the issuer certificate IDs for equality. If there is a mismatch with
257 * the same algorithm then there's no point trying to match any certificates
258 * against the issuer. If the issuer IDs all match then we just need to check
259 * equality against one of them.
262 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
264 OCSP_CERTID *tmpid, *cid;
267 idcount = sk_OCSP_SINGLERESP_num(sresp);
269 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
270 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
274 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
278 for (i = 1; i < idcount; i++) {
279 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
280 /* Check to see if IDs match */
281 if (OCSP_id_issuer_cmp(cid, tmpid)) {
282 /* If algoritm mismatch let caller deal with it */
283 if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
284 cid->hashAlgorithm->algorithm))
291 /* All IDs match: only need to check one ID */
296 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
297 STACK_OF(OCSP_SINGLERESP) *sresp)
299 /* If only one ID to match then do it */
304 unsigned char md[EVP_MAX_MD_SIZE];
305 if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) {
306 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
307 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
311 mdlen = EVP_MD_size(dgst);
314 if ((cid->issuerNameHash->length != mdlen) ||
315 (cid->issuerKeyHash->length != mdlen))
317 iname = X509_get_subject_name(cert);
318 if (!X509_NAME_digest(iname, dgst, md, NULL))
320 if (memcmp(md, cid->issuerNameHash->data, mdlen))
322 X509_pubkey_digest(cert, dgst, md, NULL);
323 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
329 /* We have to match the whole lot */
332 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
333 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
334 ret = ocsp_match_issuerid(cert, tmpid, NULL);
343 static int ocsp_check_delegated(X509 *x, int flags)
345 X509_check_purpose(x, -1, 0);
346 if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN))
348 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
353 * Verify an OCSP request. This is fortunately much easier than OCSP response
354 * verify. Just find the signers certificate and verify it against a given
358 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
359 X509_STORE *store, unsigned long flags)
366 if (!req->optionalSignature) {
367 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
370 gen = req->tbsRequest->requestorName;
371 if (!gen || gen->type != GEN_DIRNAME) {
372 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
373 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
376 nm = gen->d.directoryName;
377 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
379 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
380 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
383 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
384 flags |= OCSP_NOVERIFY;
385 if (!(flags & OCSP_NOSIGS)) {
387 skey = X509_get_pubkey(signer);
388 ret = OCSP_REQUEST_verify(req, skey);
391 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
395 if (!(flags & OCSP_NOVERIFY)) {
397 if (flags & OCSP_NOCHAIN)
398 init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
400 init_res = X509_STORE_CTX_init(&ctx, store, signer,
401 req->optionalSignature->certs);
403 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
407 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
408 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
409 ret = X509_verify_cert(&ctx);
410 X509_STORE_CTX_cleanup(&ctx);
412 ret = X509_STORE_CTX_get_error(&ctx);
413 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
414 OCSP_R_CERTIFICATE_VERIFY_ERROR);
415 ERR_add_error_data(2, "Verify error:",
416 X509_verify_cert_error_string(ret));
423 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
424 X509_NAME *nm, STACK_OF(X509) *certs,
425 X509_STORE *st, unsigned long flags)
428 if (!(flags & OCSP_NOINTERN)) {
429 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
436 signer = X509_find_by_subject(certs, nm);