2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000-2004 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
);
96 ret
= OCSP_BASICRESP_verify(bs
, skey
, 0);
101 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
, OCSP_R_SIGNATURE_FAILURE
);
105 if (!(flags
& OCSP_NOVERIFY
))
108 if(flags
& OCSP_NOCHAIN
)
109 init_res
= X509_STORE_CTX_init(&ctx
, st
, signer
, NULL
);
111 init_res
= X509_STORE_CTX_init(&ctx
, st
, signer
, bs
->certs
);
115 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
,ERR_R_X509_LIB
);
119 X509_STORE_CTX_set_purpose(&ctx
, X509_PURPOSE_OCSP_HELPER
);
120 ret
= X509_verify_cert(&ctx
);
121 chain
= X509_STORE_CTX_get1_chain(&ctx
);
122 X509_STORE_CTX_cleanup(&ctx
);
125 i
= X509_STORE_CTX_get_error(&ctx
);
126 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
,OCSP_R_CERTIFICATE_VERIFY_ERROR
);
127 ERR_add_error_data(2, "Verify error:",
128 X509_verify_cert_error_string(i
));
131 if(flags
& OCSP_NOCHECKS
)
136 /* At this point we have a valid certificate chain
137 * need to verify it against the OCSP issuer criteria.
139 ret
= ocsp_check_issuer(bs
, chain
, flags
);
141 /* If fatal error or valid match then finish */
142 if (ret
!= 0) goto end
;
144 /* Easy case: explicitly trusted. Get root CA and
145 * check for explicit trust
147 if(flags
& OCSP_NOEXPLICIT
) goto end
;
149 x
= sk_X509_value(chain
, sk_X509_num(chain
) - 1);
150 if(X509_check_trust(x
, NID_OCSP_sign
, 0) != X509_TRUST_TRUSTED
)
152 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
,OCSP_R_ROOT_CA_NOT_TRUSTED
);
161 if(chain
) sk_X509_pop_free(chain
, X509_free
);
166 static int ocsp_find_signer(X509
**psigner
, OCSP_BASICRESP
*bs
, STACK_OF(X509
) *certs
,
167 X509_STORE
*st
, unsigned long flags
)
170 OCSP_RESPID
*rid
= bs
->tbsResponseData
->responderId
;
171 if ((signer
= ocsp_find_signer_sk(certs
, rid
)))
176 if(!(flags
& OCSP_NOINTERN
) &&
177 (signer
= ocsp_find_signer_sk(bs
->certs
, rid
)))
182 /* 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
) return NULL
;
203 keyhash
= id
->value
.byKey
->data
;
204 /* Calculate hash of each key and compare */
205 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
))
216 static int ocsp_check_issuer(OCSP_BASICRESP
*bs
, STACK_OF(X509
) *chain
, unsigned long flags
)
218 STACK_OF(OCSP_SINGLERESP
) *sresp
;
220 OCSP_CERTID
*caid
= NULL
;
222 sresp
= bs
->tbsResponseData
->responses
;
224 if (sk_X509_num(chain
) <= 0)
226 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER
, OCSP_R_NO_CERTIFICATES_IN_CHAIN
);
230 /* See if the issuer IDs match. */
231 i
= ocsp_check_ids(sresp
, &caid
);
233 /* If ID mismatch or other error then return */
234 if (i
<= 0) return i
;
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)
240 sca
= sk_X509_value(chain
, 1);
241 i
= ocsp_match_issuerid(sca
, caid
, sresp
);
245 /* We have a match, if extensions OK then success */
246 if (ocsp_check_delegated(signer
, flags
)) return 1;
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 the same
257 * algorithm then there's no point trying to match any certificates against the issuer.
258 * If the issuer IDs all match then we just need to check equality against one of them.
261 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP
) *sresp
, OCSP_CERTID
**ret
)
263 OCSP_CERTID
*tmpid
, *cid
;
266 idcount
= sk_OCSP_SINGLERESP_num(sresp
);
269 OCSPerr(OCSP_F_OCSP_CHECK_IDS
, OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA
);
273 cid
= sk_OCSP_SINGLERESP_value(sresp
, 0)->certId
;
277 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
))
283 /* If algoritm mismatch let caller deal with it */
284 if (OBJ_cmp(tmpid
->hashAlgorithm
->algorithm
,
285 cid
->hashAlgorithm
->algorithm
))
292 /* All IDs match: only need to check one ID */
298 static int ocsp_match_issuerid(X509
*cert
, OCSP_CERTID
*cid
,
299 STACK_OF(OCSP_SINGLERESP
) *sresp
)
301 /* If only one ID to match then do it */
307 unsigned char md
[EVP_MAX_MD_SIZE
];
308 if (!(dgst
= EVP_get_digestbyobj(cid
->hashAlgorithm
->algorithm
)))
310 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID
, OCSP_R_UNKNOWN_MESSAGE_DIGEST
);
314 mdlen
= EVP_MD_size(dgst
);
317 if ((cid
->issuerNameHash
->length
!= mdlen
) ||
318 (cid
->issuerKeyHash
->length
!= mdlen
))
320 iname
= X509_get_subject_name(cert
);
321 if (!X509_NAME_digest(iname
, dgst
, md
, NULL
))
323 if (memcmp(md
, cid
->issuerNameHash
->data
, mdlen
))
325 X509_pubkey_digest(cert
, dgst
, md
, NULL
);
326 if (memcmp(md
, cid
->issuerKeyHash
->data
, mdlen
))
334 /* We have to match the whole lot */
337 for (i
= 0; i
< sk_OCSP_SINGLERESP_num(sresp
); i
++)
339 tmpid
= sk_OCSP_SINGLERESP_value(sresp
, i
)->certId
;
340 ret
= ocsp_match_issuerid(cert
, tmpid
, NULL
);
341 if (ret
<= 0) return ret
;
348 static int ocsp_check_delegated(X509
*x
, int flags
)
350 X509_check_purpose(x
, -1, 0);
351 if ((x
->ex_flags
& EXFLAG_XKUSAGE
) &&
352 (x
->ex_xkusage
& XKU_OCSP_SIGN
))
354 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED
, OCSP_R_MISSING_OCSPSIGNING_USAGE
);
358 /* Verify an OCSP request. This is fortunately much easier than OCSP
359 * response verify. Just find the signers certificate and verify it
360 * against a given trust value.
363 int OCSP_request_verify(OCSP_REQUEST
*req
, STACK_OF(X509
) *certs
, X509_STORE
*store
, unsigned long flags
)
370 if (!req
->optionalSignature
)
372 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_REQUEST_NOT_SIGNED
);
375 gen
= req
->tbsRequest
->requestorName
;
376 if (!gen
|| gen
->type
!= GEN_DIRNAME
)
378 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE
);
381 nm
= gen
->d
.directoryName
;
382 ret
= ocsp_req_find_signer(&signer
, req
, nm
, certs
, store
, flags
);
385 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND
);
388 if ((ret
== 2) && (flags
& OCSP_TRUSTOTHER
))
389 flags
|= OCSP_NOVERIFY
;
390 if (!(flags
& OCSP_NOSIGS
))
393 skey
= X509_get_pubkey(signer
);
394 ret
= OCSP_REQUEST_verify(req
, skey
);
398 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_SIGNATURE_FAILURE
);
402 if (!(flags
& OCSP_NOVERIFY
))
405 if(flags
& OCSP_NOCHAIN
)
406 init_res
= X509_STORE_CTX_init(&ctx
, store
, signer
, NULL
);
408 init_res
= X509_STORE_CTX_init(&ctx
, store
, signer
,
409 req
->optionalSignature
->certs
);
412 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
,ERR_R_X509_LIB
);
416 X509_STORE_CTX_set_purpose(&ctx
, X509_PURPOSE_OCSP_HELPER
);
417 X509_STORE_CTX_set_trust(&ctx
, X509_TRUST_OCSP_REQUEST
);
418 ret
= X509_verify_cert(&ctx
);
419 X509_STORE_CTX_cleanup(&ctx
);
422 ret
= X509_STORE_CTX_get_error(&ctx
);
423 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
,OCSP_R_CERTIFICATE_VERIFY_ERROR
);
424 ERR_add_error_data(2, "Verify error:",
425 X509_verify_cert_error_string(ret
));
432 static int ocsp_req_find_signer(X509
**psigner
, OCSP_REQUEST
*req
, X509_NAME
*nm
, STACK_OF(X509
) *certs
,
433 X509_STORE
*st
, unsigned long flags
)
436 if(!(flags
& OCSP_NOINTERN
))
438 signer
= X509_find_by_subject(req
->optionalSignature
->certs
, nm
);
443 signer
= X509_find_by_subject(certs
, nm
);