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;
87 STACK_OF(X509) *untrusted = NULL;
90 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
92 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
93 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
96 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
97 flags |= OCSP_NOVERIFY;
98 if (!(flags & OCSP_NOSIGS)) {
100 skey = X509_get0_pubkey(signer);
102 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) {
112 } else if (bs->certs && certs) {
113 untrusted = sk_X509_dup(bs->certs);
114 for (i = 0; i < sk_X509_num(certs); i++) {
115 if (!sk_X509_push(untrusted, sk_X509_value(certs, i))) {
116 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE);
121 untrusted = bs->certs;
123 init_res = X509_STORE_CTX_init(&ctx, st, signer, untrusted);
126 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
130 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
131 ret = X509_verify_cert(&ctx);
132 chain = X509_STORE_CTX_get1_chain(&ctx);
133 X509_STORE_CTX_cleanup(&ctx);
135 i = X509_STORE_CTX_get_error(&ctx);
136 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
137 OCSP_R_CERTIFICATE_VERIFY_ERROR);
138 ERR_add_error_data(2, "Verify error:",
139 X509_verify_cert_error_string(i));
142 if (flags & OCSP_NOCHECKS) {
147 * At this point we have a valid certificate chain need to verify it
148 * against the OCSP issuer criteria.
150 ret = ocsp_check_issuer(bs, chain, flags);
152 /* If fatal error or valid match then finish */
157 * Easy case: explicitly trusted. Get root CA and check for explicit
160 if (flags & OCSP_NOEXPLICIT)
163 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
164 if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
165 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
172 sk_X509_pop_free(chain, X509_free);
173 if (bs->certs && certs)
174 sk_X509_free(untrusted);
178 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
179 STACK_OF(X509) *certs, X509_STORE *st,
183 OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
184 if ((signer = ocsp_find_signer_sk(certs, rid))) {
188 if (!(flags & OCSP_NOINTERN) &&
189 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
193 /* Maybe lookup from store if by subject name */
199 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
202 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
205 /* Easy if lookup by name */
206 if (id->type == V_OCSP_RESPID_NAME)
207 return X509_find_by_subject(certs, id->value.byName);
209 /* Lookup by key hash */
211 /* If key hash isn't SHA1 length then forget it */
212 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
214 keyhash = id->value.byKey->data;
215 /* Calculate hash of each key and compare */
216 for (i = 0; i < sk_X509_num(certs); i++) {
217 x = sk_X509_value(certs, i);
218 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
219 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
225 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
228 STACK_OF(OCSP_SINGLERESP) *sresp;
230 OCSP_CERTID *caid = NULL;
232 sresp = bs->tbsResponseData.responses;
234 if (sk_X509_num(chain) <= 0) {
235 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
239 /* See if the issuer IDs match. */
240 i = ocsp_check_ids(sresp, &caid);
242 /* If ID mismatch or other error then return */
246 signer = sk_X509_value(chain, 0);
247 /* Check to see if OCSP responder CA matches request CA */
248 if (sk_X509_num(chain) > 1) {
249 sca = sk_X509_value(chain, 1);
250 i = ocsp_match_issuerid(sca, caid, sresp);
254 /* We have a match, if extensions OK then success */
255 if (ocsp_check_delegated(signer, flags))
261 /* Otherwise check if OCSP request signed directly by request CA */
262 return ocsp_match_issuerid(signer, caid, sresp);
266 * Check the issuer certificate IDs for equality. If there is a mismatch with
267 * the same algorithm then there's no point trying to match any certificates
268 * against the issuer. If the issuer IDs all match then we just need to check
269 * equality against one of them.
272 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
274 OCSP_CERTID *tmpid, *cid;
277 idcount = sk_OCSP_SINGLERESP_num(sresp);
279 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
280 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
284 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
288 for (i = 1; i < idcount; i++) {
289 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
290 /* Check to see if IDs match */
291 if (OCSP_id_issuer_cmp(cid, tmpid)) {
292 /* If algoritm mismatch let caller deal with it */
293 if (OBJ_cmp(tmpid->hashAlgorithm.algorithm,
294 cid->hashAlgorithm.algorithm))
301 /* All IDs match: only need to check one ID */
306 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
307 STACK_OF(OCSP_SINGLERESP) *sresp)
309 /* If only one ID to match then do it */
314 unsigned char md[EVP_MAX_MD_SIZE];
315 if ((dgst = EVP_get_digestbyobj(cid->hashAlgorithm.algorithm))
317 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
318 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
322 mdlen = EVP_MD_size(dgst);
325 if ((cid->issuerNameHash.length != mdlen) ||
326 (cid->issuerKeyHash.length != mdlen))
328 iname = X509_get_subject_name(cert);
329 if (!X509_NAME_digest(iname, dgst, md, NULL))
331 if (memcmp(md, cid->issuerNameHash.data, mdlen))
333 X509_pubkey_digest(cert, dgst, md, NULL);
334 if (memcmp(md, cid->issuerKeyHash.data, mdlen))
340 /* We have to match the whole lot */
343 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
344 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
345 ret = ocsp_match_issuerid(cert, tmpid, NULL);
354 static int ocsp_check_delegated(X509 *x, int flags)
356 if ((X509_get_extension_flags(x) & EXFLAG_XKUSAGE)
357 && (X509_get_extended_key_usage(x) & XKU_OCSP_SIGN))
359 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
364 * Verify an OCSP request. This is fortunately much easier than OCSP response
365 * verify. Just find the signers certificate and verify it against a given
369 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
370 X509_STORE *store, unsigned long flags)
377 if (!req->optionalSignature) {
378 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
381 gen = req->tbsRequest.requestorName;
382 if (!gen || gen->type != GEN_DIRNAME) {
383 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
384 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
387 nm = gen->d.directoryName;
388 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
390 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
391 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
394 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
395 flags |= OCSP_NOVERIFY;
396 if (!(flags & OCSP_NOSIGS)) {
398 skey = X509_get0_pubkey(signer);
399 ret = OCSP_REQUEST_verify(req, skey);
401 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
405 if (!(flags & OCSP_NOVERIFY)) {
407 if (flags & OCSP_NOCHAIN)
408 init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
410 init_res = X509_STORE_CTX_init(&ctx, store, signer,
411 req->optionalSignature->certs);
413 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
417 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
418 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
419 ret = X509_verify_cert(&ctx);
420 X509_STORE_CTX_cleanup(&ctx);
422 ret = X509_STORE_CTX_get_error(&ctx);
423 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
424 OCSP_R_CERTIFICATE_VERIFY_ERROR);
425 ERR_add_error_data(2, "Verify error:",
426 X509_verify_cert_error_string(ret));
433 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
434 X509_NAME *nm, STACK_OF(X509) *certs,
435 X509_STORE *st, unsigned long flags)
438 if (!(flags & OCSP_NOINTERN)) {
439 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
446 signer = X509_find_by_subject(certs, nm);