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);
71 /* Verify a basic response message */
73 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
74 X509_STORE *st, unsigned long flags)
77 STACK_OF(X509) *chain = NULL;
80 ret = ocsp_find_signer(&signer, bs, certs, st, flags);
83 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
86 if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
87 flags |= OCSP_NOVERIFY;
88 if (!(flags & OCSP_NOSIGS))
91 skey = X509_get_pubkey(signer);
92 ret = OCSP_BASICRESP_verify(bs, skey, 0);
96 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
100 if (!(flags & OCSP_NOVERIFY))
102 if(flags & OCSP_NOCHAIN)
103 X509_STORE_CTX_init(&ctx, st, signer, NULL);
105 X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
107 X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
108 ret = X509_verify_cert(&ctx);
109 chain = X509_STORE_CTX_get1_chain(&ctx);
110 X509_STORE_CTX_cleanup(&ctx);
113 i = X509_STORE_CTX_get_error(&ctx);
114 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_CERTIFICATE_VERIFY_ERROR);
115 ERR_add_error_data(2, "Verify error:",
116 X509_verify_cert_error_string(i));
119 if(flags & OCSP_NOCHECKS)
124 /* At this point we have a valid certificate chain
125 * need to verify it against the OCSP issuer criteria.
127 ret = ocsp_check_issuer(bs, chain, flags);
129 /* If fatal error or valid match then finish */
130 if (ret != 0) goto end;
132 /* Easy case: explicitly trusted. Get root CA and
133 * check for explicit trust
135 if(flags & OCSP_NOEXPLICIT) goto end;
137 x = sk_X509_value(chain, sk_X509_num(chain) - 1);
138 if(X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED)
140 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,OCSP_R_ROOT_CA_NOT_TRUSTED);
149 if(chain) sk_X509_pop_free(chain, X509_free);
154 static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
155 X509_STORE *st, unsigned long flags)
158 OCSP_RESPID *rid = bs->tbsResponseData->responderId;
159 if ((signer = ocsp_find_signer_sk(certs, rid)))
164 if(!(flags & OCSP_NOINTERN) &&
165 (signer = ocsp_find_signer_sk(bs->certs, rid)))
170 /* Maybe lookup from store if by subject name */
177 static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
180 unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
183 /* Easy if lookup by name */
184 if (id->type == V_OCSP_RESPID_NAME)
185 return X509_find_by_subject(certs, id->value.byName);
187 /* Lookup by key hash */
189 /* If key hash isn't SHA1 length then forget it */
190 if (id->value.byKey->length != SHA_DIGEST_LENGTH) return NULL;
191 keyhash = id->value.byKey->data;
192 /* Calculate hash of each key and compare */
193 for (i = 0; i < sk_X509_num(certs); i++)
195 x = sk_X509_value(certs, i);
196 X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
197 if(!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
204 static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain, unsigned long flags)
206 STACK_OF(OCSP_SINGLERESP) *sresp;
208 OCSP_CERTID *caid = NULL;
210 sresp = bs->tbsResponseData->responses;
212 if (sk_X509_num(chain) <= 0)
214 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
218 /* See if the issuer IDs match. */
219 i = ocsp_check_ids(sresp, &caid);
221 /* If ID mismatch or other error then return */
222 if (i <= 0) return i;
224 signer = sk_X509_value(chain, 0);
225 /* Check to see if OCSP responder CA matches request CA */
226 if (sk_X509_num(chain) > 1)
228 sca = sk_X509_value(chain, 1);
229 i = ocsp_match_issuerid(sca, caid, sresp);
233 /* We have a match, if extensions OK then success */
234 if (ocsp_check_delegated(signer, flags)) return 1;
239 /* Otherwise check if OCSP request signed directly by request CA */
240 return ocsp_match_issuerid(signer, caid, sresp);
244 /* Check the issuer certificate IDs for equality. If there is a mismatch with the same
245 * algorithm then there's no point trying to match any certificates against the issuer.
246 * If the issuer IDs all match then we just need to check equality against one of them.
249 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
251 OCSP_CERTID *tmpid, *cid;
254 idcount = sk_OCSP_SINGLERESP_num(sresp);
257 OCSPerr(OCSP_F_OCSP_CHECK_IDS, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
261 cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
265 for (i = 1; i < idcount; i++)
267 tmpid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
268 /* Check to see if IDs match */
269 if (OCSP_id_issuer_cmp(cid, tmpid))
271 /* If algoritm mismatch let caller deal with it */
272 if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
273 cid->hashAlgorithm->algorithm))
280 /* All IDs match: only need to check one ID */
286 static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
287 STACK_OF(OCSP_SINGLERESP) *sresp)
289 /* If only one ID to match then do it */
295 unsigned char md[EVP_MAX_MD_SIZE];
296 if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm)))
298 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID, OCSP_R_UNKNOWN_MESSAGE_DIGEST);
302 mdlen = EVP_MD_size(dgst);
303 if ((cid->issuerNameHash->length != mdlen) ||
304 (cid->issuerKeyHash->length != mdlen))
306 iname = X509_get_issuer_name(cert);
307 if (!X509_NAME_digest(iname, dgst, md, NULL))
309 if (memcmp(md, cid->issuerNameHash->data, mdlen))
311 X509_pubkey_digest(cert, EVP_sha1(), md, NULL);
312 if (memcmp(md, cid->issuerKeyHash->data, mdlen))
320 /* We have to match the whole lot */
323 for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++)
325 tmpid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
326 ret = ocsp_match_issuerid(cert, tmpid, NULL);
327 if (ret <= 0) return ret;
334 static int ocsp_check_delegated(X509 *x, int flags)
336 X509_check_purpose(x, -1, 0);
337 if ((x->ex_flags & EXFLAG_XKUSAGE) &&
338 (x->ex_xkusage & XKU_OCSP_SIGN))
340 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);