2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000 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/)"
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.
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.
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)
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 * ====================================================================
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>
60 #include <openssl/err.h>
63 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
64 X509_STORE *st, unsigned long flags);
65 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
66 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags);
67 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret);
68 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid, STACK_OF(OCSP_SINGLERESP) *sresp);
69 static int ocsp_check_delegated(X509 *x, int flags);
70 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
71 X509_STORE *st, unsigned long flags);
73 /* Verify a basic response message */
75 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
76 X509_STORE *st, unsigned long flags)
79 STACK_OF(X509) *chain = NULL;
82 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
85 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
88 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
89 flags |= OCSP_NOVERIFY;
90 if (!(flags & OCSP_NOSIGS))
93 skey = X509_get_pubkey(signer);
94 ret = OCSP_BASICRESP_verify(bs, skey, 0);
98 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
102 if (!(flags & OCSP_NOVERIFY))
104 if(flags & OCSP_NOCHAIN)
105 X509_STORE_CTX_init(&ctx, st, signer, NULL);
107 X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
109 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
110 ret = X509_verify_cert(&ctx);
111 chain = X509_STORE_CTX_get1_chain(&ctx);
112 X509_STORE_CTX_cleanup(&ctx);
115 i = X509_STORE_CTX_get_error(&ctx);
116 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
117 ERR_add_error_data(2, "Verify error:",
118 X509_verify_cert_error_string(i));
121 if(flags & OCSP_NOCHECKS)
126 /* At this point we have a valid certificate chain
127 * need to verify it against the OCSP issuer criteria.
129 ret = ocsp_check_issuer(bs, chain, flags);
131 /* If fatal error or valid match then finish */
132 if (ret != 0) goto end;
134 /* Easy case: explicitly trusted. Get root CA and
135 * check for explicit trust
137 if(flags & OCSP_NOEXPLICIT) goto end;
139 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
140 if(X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED)
142 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_ROOT_CA_NOT_TRUSTED);
151 if(chain) sk_X509_pop_free(chain, X509_free);
156 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
157 X509_STORE *st, unsigned long flags)
160 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
161 if ((signer = ocsp_find_signer_sk(certs, rid)))
166 if(!(flags & OCSP_NOINTERN) &&
167 (signer = ocsp_find_signer_sk(bs->certs, rid)))
172 /* Maybe lookup from store if by subject name */
179 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
182 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
185 /* Easy if lookup by name */
186 if (id->type == V_OCSP_RESPID_NAME)
187 return X509_find_by_subject(certs, id->value.byName);
189 /* Lookup by key hash */
191 /* If key hash isn't SHA1 length then forget it */
192 if (id->value.byKey->length != SHA_DIGEST_LENGTH) return NULL;
193 keyhash = id->value.byKey->data;
194 /* Calculate hash of each key and compare */
195 for (i = 0; i < sk_X509_num(certs); i++)
197 x = sk_X509_value(certs, i);
198 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
199 if(!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
206 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags)
208 STACK_OF(OCSP_SINGLERESP) *sresp;
210 OCSP_CERTID *caid = NULL;
212 sresp = bs->tbsResponseData->responses;
214 if (sk_X509_num(chain) <= 0)
216 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
220 /* See if the issuer IDs match. */
221 i = ocsp_check_ids(sresp, &caid);
223 /* If ID mismatch or other error then return */
224 if (i <= 0) return i;
226 signer = sk_X509_value(chain, 0);
227 /* Check to see if OCSP responder CA matches request CA */
228 if (sk_X509_num(chain) > 1)
230 sca = sk_X509_value(chain, 1);
231 i = ocsp_match_issuerid(sca, caid, sresp);
235 /* We have a match, if extensions OK then success */
236 if (ocsp_check_delegated(signer, flags)) return 1;
241 /* Otherwise check if OCSP request signed directly by request CA */
242 return ocsp_match_issuerid(signer, caid, sresp);
246 /* Check the issuer certificate IDs for equality. If there is a mismatch with the same
247 * algorithm then there's no point trying to match any certificates against the issuer.
248 * If the issuer IDs all match then we just need to check equality against one of them.
251 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
253 OCSP_CERTID *tmpid, *cid;
256 idcount = sk_OCSP_SINGLERESP_num(sresp);
259 OCSPerr(OCSP_F_OCSP_CHECK_IDS, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
263 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
267 for (i = 1; i < idcount; i++)
269 tmpid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
270 /* Check to see if IDs match */
271 if (OCSP_id_issuer_cmp(cid, tmpid))
273 /* If algoritm mismatch let caller deal with it */
274 if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
275 cid->hashAlgorithm->algorithm))
282 /* All IDs match: only need to check one ID */
288 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
289 STACK_OF(OCSP_SINGLERESP) *sresp)
291 /* If only one ID to match then do it */
297 unsigned char md[EVP_MAX_MD_SIZE];
298 if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm)))
300 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, OCSP_R_UNKNOWN_MESSAGE_DIGEST);
304 mdlen = EVP_MD_size(dgst);
305 if ((cid->issuerNameHash->length != mdlen) ||
306 (cid->issuerKeyHash->length != mdlen))
308 iname = X509_get_issuer_name(cert);
309 if (!X509_NAME_digest(iname, dgst, md, NULL))
311 if (memcmp(md, cid->issuerNameHash->data, mdlen))
313 X509_pubkey_digest(cert, EVP_sha1(), md, NULL);
314 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
322 /* We have to match the whole lot */
325 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++)
327 tmpid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
328 ret = ocsp_match_issuerid(cert, tmpid, NULL);
329 if (ret <= 0) return ret;
336 static int ocsp_check_delegated(X509 *x, int flags)
338 X509_check_purpose(x, -1, 0);
339 if ((x->ex_flags & EXFLAG_XKUSAGE) &&
340 (x->ex_xkusage & XKU_OCSP_SIGN))
342 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
346 /* Verify an OCSP request. This is fortunately much easier than OCSP
347 * request verify. Just find the signers certificate and verify it
348 * against a given trust value.
351 int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs, X509_STORE *store, unsigned long flags)
358 if (!req->optionalSignature)
360 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
363 gen = req->tbsRequest->requestorName;
364 if (gen->type != GEN_DIRNAME)
366 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
369 nm = gen->d.directoryName;
370 ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
373 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
376 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
377 flags |= OCSP_NOVERIFY;
378 if (!(flags & OCSP_NOSIGS))
381 skey = X509_get_pubkey(signer);
382 ret = OCSP_REQUEST_verify(req, skey);
386 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
390 if (!(flags & OCSP_NOVERIFY))
392 if(flags & OCSP_NOCHAIN)
393 X509_STORE_CTX_init(&ctx, store, signer, NULL);
395 X509_STORE_CTX_init(&ctx, store, signer, req->optionalSignature->certs);
397 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
398 X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
399 ret = X509_verify_cert(&ctx);
400 X509_STORE_CTX_cleanup(&ctx);
403 ret = X509_STORE_CTX_get_error(&ctx);
404 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
405 ERR_add_error_data(2, "Verify error:",
406 X509_verify_cert_error_string(ret));
413 static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req, X509_NAME *nm, STACK_OF(X509) *certs,
414 X509_STORE *st, unsigned long flags)
417 if(!(flags & OCSP_NOINTERN))
419 signer = X509_find_by_subject(req->optionalSignature->certs, nm);
424 signer = X509_find_by_subject(certs, nm);