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>
61 #include <openssl/err.h>
64 static int ocsp_find_signer(X509
**psigner
, OCSP_BASICRESP
*bs
,
65 STACK_OF(X509
) *certs
, X509_STORE
*st
,
67 static X509
*ocsp_find_signer_sk(STACK_OF(X509
) *certs
, OCSP_RESPID
*id
);
68 static int ocsp_check_issuer(OCSP_BASICRESP
*bs
, STACK_OF(X509
) *chain
,
70 static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP
) *sresp
,
72 static int ocsp_match_issuerid(X509
*cert
, OCSP_CERTID
*cid
,
73 STACK_OF(OCSP_SINGLERESP
) *sresp
);
74 static int ocsp_check_delegated(X509
*x
, int flags
);
75 static int ocsp_req_find_signer(X509
**psigner
, OCSP_REQUEST
*req
,
76 X509_NAME
*nm
, STACK_OF(X509
) *certs
,
77 X509_STORE
*st
, unsigned long flags
);
79 /* Verify a basic response message */
81 int OCSP_basic_verify(OCSP_BASICRESP
*bs
, STACK_OF(X509
) *certs
,
82 X509_STORE
*st
, unsigned long flags
)
85 STACK_OF(X509
) *chain
= NULL
;
88 ret
= ocsp_find_signer(&signer
, bs
, certs
, st
, flags
);
90 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
,
91 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND
);
94 if ((ret
== 2) && (flags
& OCSP_TRUSTOTHER
))
95 flags
|= OCSP_NOVERIFY
;
96 if (!(flags
& OCSP_NOSIGS
)) {
98 skey
= X509_get_pubkey(signer
);
100 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
)
111 init_res
= X509_STORE_CTX_init(&ctx
, st
, signer
, NULL
);
113 init_res
= X509_STORE_CTX_init(&ctx
, st
, signer
, bs
->certs
);
116 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
, ERR_R_X509_LIB
);
120 X509_STORE_CTX_set_purpose(&ctx
, X509_PURPOSE_OCSP_HELPER
);
121 ret
= X509_verify_cert(&ctx
);
122 chain
= X509_STORE_CTX_get1_chain(&ctx
);
123 X509_STORE_CTX_cleanup(&ctx
);
125 i
= X509_STORE_CTX_get_error(&ctx
);
126 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
,
127 OCSP_R_CERTIFICATE_VERIFY_ERROR
);
128 ERR_add_error_data(2, "Verify error:",
129 X509_verify_cert_error_string(i
));
132 if (flags
& OCSP_NOCHECKS
) {
137 * At this point we have a valid certificate chain need to verify it
138 * against the OCSP issuer criteria.
140 ret
= ocsp_check_issuer(bs
, chain
, flags
);
142 /* If fatal error or valid match then finish */
147 * Easy case: explicitly trusted. Get root CA and check for explicit
150 if (flags
& OCSP_NOEXPLICIT
)
153 x
= sk_X509_value(chain
, sk_X509_num(chain
) - 1);
154 if (X509_check_trust(x
, NID_OCSP_sign
, 0) != X509_TRUST_TRUSTED
) {
155 OCSPerr(OCSP_F_OCSP_BASIC_VERIFY
, OCSP_R_ROOT_CA_NOT_TRUSTED
);
163 sk_X509_pop_free(chain
, X509_free
);
167 static int ocsp_find_signer(X509
**psigner
, OCSP_BASICRESP
*bs
,
168 STACK_OF(X509
) *certs
, X509_STORE
*st
,
172 OCSP_RESPID
*rid
= bs
->tbsResponseData
->responderId
;
173 if ((signer
= ocsp_find_signer_sk(certs
, rid
))) {
177 if (!(flags
& OCSP_NOINTERN
) &&
178 (signer
= ocsp_find_signer_sk(bs
->certs
, rid
))) {
182 /* Maybe lookup from store if by subject name */
188 static X509
*ocsp_find_signer_sk(STACK_OF(X509
) *certs
, OCSP_RESPID
*id
)
191 unsigned char tmphash
[SHA_DIGEST_LENGTH
], *keyhash
;
194 /* Easy if lookup by name */
195 if (id
->type
== V_OCSP_RESPID_NAME
)
196 return X509_find_by_subject(certs
, id
->value
.byName
);
198 /* Lookup by key hash */
200 /* If key hash isn't SHA1 length then forget it */
201 if (id
->value
.byKey
->length
!= SHA_DIGEST_LENGTH
)
203 keyhash
= id
->value
.byKey
->data
;
204 /* Calculate hash of each key and compare */
205 for (i
= 0; i
< sk_X509_num(certs
); i
++) {
206 x
= sk_X509_value(certs
, i
);
207 X509_pubkey_digest(x
, EVP_sha1(), tmphash
, NULL
);
208 if (!memcmp(keyhash
, tmphash
, SHA_DIGEST_LENGTH
))
214 static int ocsp_check_issuer(OCSP_BASICRESP
*bs
, STACK_OF(X509
) *chain
,
217 STACK_OF(OCSP_SINGLERESP
) *sresp
;
219 OCSP_CERTID
*caid
= NULL
;
221 sresp
= bs
->tbsResponseData
->responses
;
223 if (sk_X509_num(chain
) <= 0) {
224 OCSPerr(OCSP_F_OCSP_CHECK_ISSUER
, OCSP_R_NO_CERTIFICATES_IN_CHAIN
);
228 /* See if the issuer IDs match. */
229 i
= ocsp_check_ids(sresp
, &caid
);
231 /* If ID mismatch or other error then return */
235 signer
= sk_X509_value(chain
, 0);
236 /* Check to see if OCSP responder CA matches request CA */
237 if (sk_X509_num(chain
) > 1) {
238 sca
= sk_X509_value(chain
, 1);
239 i
= ocsp_match_issuerid(sca
, caid
, sresp
);
243 /* We have a match, if extensions OK then success */
244 if (ocsp_check_delegated(signer
, flags
))
250 /* Otherwise check if OCSP request signed directly by request CA */
251 return ocsp_match_issuerid(signer
, caid
, sresp
);
255 * Check the issuer certificate IDs for equality. If there is a mismatch with
256 * the same algorithm then there's no point trying to match any certificates
257 * against the issuer. If the issuer IDs all match then we just need to check
258 * 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
);
268 OCSPerr(OCSP_F_OCSP_CHECK_IDS
,
269 OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA
);
273 cid
= sk_OCSP_SINGLERESP_value(sresp
, 0)->certId
;
277 for (i
= 1; i
< idcount
; i
++) {
278 tmpid
= sk_OCSP_SINGLERESP_value(sresp
, i
)->certId
;
279 /* Check to see if IDs match */
280 if (OCSP_id_issuer_cmp(cid
, tmpid
)) {
281 /* If algoritm mismatch let caller deal with it */
282 if (OBJ_cmp(tmpid
->hashAlgorithm
->algorithm
,
283 cid
->hashAlgorithm
->algorithm
))
290 /* All IDs match: only need to check one ID */
295 static int ocsp_match_issuerid(X509
*cert
, OCSP_CERTID
*cid
,
296 STACK_OF(OCSP_SINGLERESP
) *sresp
)
298 /* If only one ID to match then do it */
303 unsigned char md
[EVP_MAX_MD_SIZE
];
304 if (!(dgst
= EVP_get_digestbyobj(cid
->hashAlgorithm
->algorithm
))) {
305 OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID
,
306 OCSP_R_UNKNOWN_MESSAGE_DIGEST
);
310 mdlen
= EVP_MD_size(dgst
);
313 if ((cid
->issuerNameHash
->length
!= mdlen
) ||
314 (cid
->issuerKeyHash
->length
!= mdlen
))
316 iname
= X509_get_subject_name(cert
);
317 if (!X509_NAME_digest(iname
, dgst
, md
, NULL
))
319 if (memcmp(md
, cid
->issuerNameHash
->data
, mdlen
))
321 X509_pubkey_digest(cert
, dgst
, md
, NULL
);
322 if (memcmp(md
, cid
->issuerKeyHash
->data
, mdlen
))
328 /* We have to match the whole lot */
331 for (i
= 0; i
< sk_OCSP_SINGLERESP_num(sresp
); i
++) {
332 tmpid
= sk_OCSP_SINGLERESP_value(sresp
, i
)->certId
;
333 ret
= ocsp_match_issuerid(cert
, tmpid
, NULL
);
342 static int ocsp_check_delegated(X509
*x
, int flags
)
344 X509_check_purpose(x
, -1, 0);
345 if ((x
->ex_flags
& EXFLAG_XKUSAGE
) && (x
->ex_xkusage
& XKU_OCSP_SIGN
))
347 OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED
, OCSP_R_MISSING_OCSPSIGNING_USAGE
);
352 * Verify an OCSP request. This is fortunately much easier than OCSP response
353 * verify. Just find the signers certificate and verify it against a given
357 int OCSP_request_verify(OCSP_REQUEST
*req
, STACK_OF(X509
) *certs
,
358 X509_STORE
*store
, unsigned long flags
)
365 if (!req
->optionalSignature
) {
366 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_REQUEST_NOT_SIGNED
);
369 gen
= req
->tbsRequest
->requestorName
;
370 if (!gen
|| gen
->type
!= GEN_DIRNAME
) {
371 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
,
372 OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE
);
375 nm
= gen
->d
.directoryName
;
376 ret
= ocsp_req_find_signer(&signer
, req
, nm
, certs
, store
, flags
);
378 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
,
379 OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND
);
382 if ((ret
== 2) && (flags
& OCSP_TRUSTOTHER
))
383 flags
|= OCSP_NOVERIFY
;
384 if (!(flags
& OCSP_NOSIGS
)) {
386 skey
= X509_get_pubkey(signer
);
387 ret
= OCSP_REQUEST_verify(req
, skey
);
390 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, OCSP_R_SIGNATURE_FAILURE
);
394 if (!(flags
& OCSP_NOVERIFY
)) {
396 if (flags
& OCSP_NOCHAIN
)
397 init_res
= X509_STORE_CTX_init(&ctx
, store
, signer
, NULL
);
399 init_res
= X509_STORE_CTX_init(&ctx
, store
, signer
,
400 req
->optionalSignature
->certs
);
402 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
, ERR_R_X509_LIB
);
406 X509_STORE_CTX_set_purpose(&ctx
, X509_PURPOSE_OCSP_HELPER
);
407 X509_STORE_CTX_set_trust(&ctx
, X509_TRUST_OCSP_REQUEST
);
408 ret
= X509_verify_cert(&ctx
);
409 X509_STORE_CTX_cleanup(&ctx
);
411 ret
= X509_STORE_CTX_get_error(&ctx
);
412 OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY
,
413 OCSP_R_CERTIFICATE_VERIFY_ERROR
);
414 ERR_add_error_data(2, "Verify error:",
415 X509_verify_cert_error_string(ret
));
422 static int ocsp_req_find_signer(X509
**psigner
, OCSP_REQUEST
*req
,
423 X509_NAME
*nm
, STACK_OF(X509
) *certs
,
424 X509_STORE
*st
, unsigned long flags
)
427 if (!(flags
& OCSP_NOINTERN
)) {
428 signer
= X509_find_by_subject(req
->optionalSignature
->certs
, nm
);
435 signer
= X509_find_by_subject(certs
, nm
);