2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2000-2016 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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28 * licensing@OpenSSL.org.
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31 * nor may "OpenSSL" appear in their names without prior written
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34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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)
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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 * ====================================================================
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).
59 #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, unsigned long flags);
66 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
67 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain);
68 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp,
70 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
71 STACK_OF(OCSP_SINGLERESP) *sresp);
72 static int ocsp_check_delegated(X509 *x);
73 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
74 X509_NAME *nm, STACK_OF(X509) *certs,
77 /* Verify a basic response message */
79 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
80 X509_STORE *st, unsigned long flags)
83 STACK_OF(X509) *chain = NULL;
84 STACK_OF(X509) *untrusted = NULL;
85 X509_STORE_CTX *ctx = NULL;
86 int i, ret = ocsp_find_signer(&signer, bs, certs, flags);
89 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
90 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
93 ctx = X509_STORE_CTX_new();
95 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE);
98 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
99 flags |= OCSP_NOVERIFY;
100 if (!(flags & OCSP_NOSIGS)) {
102 skey = X509_get0_pubkey(signer);
104 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_NO_SIGNER_KEY);
107 ret = OCSP_BASICRESP_verify(bs, skey, 0);
109 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
113 if (!(flags & OCSP_NOVERIFY)) {
115 if (flags & OCSP_NOCHAIN) {
117 } else if (bs->certs && certs) {
118 untrusted = sk_X509_dup(bs->certs);
119 for (i = 0; i < sk_X509_num(certs); i++) {
120 if (!sk_X509_push(untrusted, sk_X509_value(certs, i))) {
121 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_MALLOC_FAILURE);
126 untrusted = bs->certs;
128 init_res = X509_STORE_CTX_init(ctx, st, signer, untrusted);
130 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
134 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);
135 ret = X509_verify_cert(ctx);
136 chain = X509_STORE_CTX_get1_chain(ctx);
138 i = X509_STORE_CTX_get_error(ctx);
139 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
140 OCSP_R_CERTIFICATE_VERIFY_ERROR);
141 ERR_add_error_data(2, "Verify error:",
142 X509_verify_cert_error_string(i));
145 if (flags & OCSP_NOCHECKS) {
150 * At this point we have a valid certificate chain need to verify it
151 * against the OCSP issuer criteria.
153 ret = ocsp_check_issuer(bs, chain);
155 /* If fatal error or valid match then finish */
160 * Easy case: explicitly trusted. Get root CA and check for explicit
163 if (flags & OCSP_NOEXPLICIT)
166 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
167 if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
168 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
174 X509_STORE_CTX_free(ctx);
175 sk_X509_pop_free(chain, X509_free);
176 if (bs->certs && certs)
177 sk_X509_free(untrusted);
189 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
190 STACK_OF(X509) *certs, unsigned long flags)
193 OCSP_RESPID *rid = &bs->tbsResponseData.responderId;
194 if ((signer = ocsp_find_signer_sk(certs, rid))) {
198 if (!(flags & OCSP_NOINTERN) &&
199 (signer = ocsp_find_signer_sk(bs->certs, rid))) {
203 /* Maybe lookup from store if by subject name */
209 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
212 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
215 /* Easy if lookup by name */
216 if (id->type == V_OCSP_RESPID_NAME)
217 return X509_find_by_subject(certs, id->value.byName);
219 /* Lookup by key hash */
221 /* If key hash isn't SHA1 length then forget it */
222 if (id->value.byKey->length != SHA_DIGEST_LENGTH)
224 keyhash = id->value.byKey->data;
225 /* Calculate hash of each key and compare */
226 for (i = 0; i < sk_X509_num(certs); i++) {
227 x = sk_X509_value(certs, i);
228 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
229 if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
235 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain)
237 STACK_OF(OCSP_SINGLERESP) *sresp;
239 OCSP_CERTID *caid = NULL;
241 sresp = bs->tbsResponseData.responses;
243 if (sk_X509_num(chain) <= 0) {
244 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
248 /* See if the issuer IDs match. */
249 i = ocsp_check_ids(sresp, &caid);
251 /* If ID mismatch or other error then return */
255 signer = sk_X509_value(chain, 0);
256 /* Check to see if OCSP responder CA matches request CA */
257 if (sk_X509_num(chain) > 1) {
258 sca = sk_X509_value(chain, 1);
259 i = ocsp_match_issuerid(sca, caid, sresp);
263 /* We have a match, if extensions OK then success */
264 if (ocsp_check_delegated(signer))
270 /* Otherwise check if OCSP request signed directly by request CA */
271 return ocsp_match_issuerid(signer, caid, sresp);
275 * Check the issuer certificate IDs for equality. If there is a mismatch with
276 * the same algorithm then there's no point trying to match any certificates
277 * against the issuer. If the issuer IDs all match then we just need to check
278 * equality against one of them.
281 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
283 OCSP_CERTID *tmpid, *cid;
286 idcount = sk_OCSP_SINGLERESP_num(sresp);
288 OCSPerr(OCSP_F_OCSP_CHECK_IDS,
289 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
293 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
297 for (i = 1; i < idcount; i++) {
298 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
299 /* Check to see if IDs match */
300 if (OCSP_id_issuer_cmp(cid, tmpid)) {
301 /* If algorithm mismatch let caller deal with it */
302 if (OBJ_cmp(tmpid->hashAlgorithm.algorithm,
303 cid->hashAlgorithm.algorithm))
310 /* All IDs match: only need to check one ID */
315 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
316 STACK_OF(OCSP_SINGLERESP) *sresp)
318 /* If only one ID to match then do it */
323 unsigned char md[EVP_MAX_MD_SIZE];
324 if ((dgst = EVP_get_digestbyobj(cid->hashAlgorithm.algorithm))
326 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
327 OCSP_R_UNKNOWN_MESSAGE_DIGEST);
331 mdlen = EVP_MD_size(dgst);
334 if ((cid->issuerNameHash.length != mdlen) ||
335 (cid->issuerKeyHash.length != mdlen))
337 iname = X509_get_subject_name(cert);
338 if (!X509_NAME_digest(iname, dgst, md, NULL))
340 if (memcmp(md, cid->issuerNameHash.data, mdlen))
342 X509_pubkey_digest(cert, dgst, md, NULL);
343 if (memcmp(md, cid->issuerKeyHash.data, mdlen))
349 /* We have to match the whole lot */
352 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
353 tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
354 ret = ocsp_match_issuerid(cert, tmpid, NULL);
363 static int ocsp_check_delegated(X509 *x)
365 if ((X509_get_extension_flags(x) & EXFLAG_XKUSAGE)
366 && (X509_get_extended_key_usage(x) & XKU_OCSP_SIGN))
368 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
373 * Verify an OCSP request. This is fortunately much easier than OCSP response
374 * verify. Just find the signers certificate and verify it against a given
378 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
379 X509_STORE *store, unsigned long flags)
385 X509_STORE_CTX *ctx = X509_STORE_CTX_new();
388 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_MALLOC_FAILURE);
392 if (!req->optionalSignature) {
393 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
396 gen = req->tbsRequest.requestorName;
397 if (!gen || gen->type != GEN_DIRNAME) {
398 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
399 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
402 nm = gen->d.directoryName;
403 ret = ocsp_req_find_signer(&signer, req, nm, certs, flags);
405 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
406 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
409 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
410 flags |= OCSP_NOVERIFY;
411 if (!(flags & OCSP_NOSIGS)) {
413 skey = X509_get0_pubkey(signer);
414 ret = OCSP_REQUEST_verify(req, skey);
416 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
420 if (!(flags & OCSP_NOVERIFY)) {
422 if (flags & OCSP_NOCHAIN)
423 init_res = X509_STORE_CTX_init(ctx, store, signer, NULL);
425 init_res = X509_STORE_CTX_init(ctx, store, signer,
426 req->optionalSignature->certs);
428 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
432 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);
433 X509_STORE_CTX_set_trust(ctx, X509_TRUST_OCSP_REQUEST);
434 ret = X509_verify_cert(ctx);
436 ret = X509_STORE_CTX_get_error(ctx);
437 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
438 OCSP_R_CERTIFICATE_VERIFY_ERROR);
439 ERR_add_error_data(2, "Verify error:",
440 X509_verify_cert_error_string(ret));
450 X509_STORE_CTX_free(ctx);
455 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
456 X509_NAME *nm, STACK_OF(X509) *certs,
460 if (!(flags & OCSP_NOINTERN)) {
461 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
468 signer = X509_find_by_subject(certs, nm);