442 lines
14 KiB
C
442 lines
14 KiB
C
/* ocsp_vfy.c */
|
|
/*
|
|
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
|
|
* 2000.
|
|
*/
|
|
/* ====================================================================
|
|
* Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* 3. All advertising materials mentioning features or use of this
|
|
* software must display the following acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
|
|
*
|
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
|
* endorse or promote products derived from this software without
|
|
* prior written permission. For written permission, please contact
|
|
* licensing@OpenSSL.org.
|
|
*
|
|
* 5. Products derived from this software may not be called "OpenSSL"
|
|
* nor may "OpenSSL" appear in their names without prior written
|
|
* permission of the OpenSSL Project.
|
|
*
|
|
* 6. Redistributions of any form whatsoever must retain the following
|
|
* acknowledgment:
|
|
* "This product includes software developed by the OpenSSL Project
|
|
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
|
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
|
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
* ====================================================================
|
|
*
|
|
* This product includes cryptographic software written by Eric Young
|
|
* (eay@cryptsoft.com). This product includes software written by Tim
|
|
* Hudson (tjh@cryptsoft.com).
|
|
*
|
|
*/
|
|
|
|
#include <openssl/ocsp.h>
|
|
#include "ocsp_lcl.h"
|
|
#include <openssl/err.h>
|
|
#include <string.h>
|
|
|
|
static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
|
|
STACK_OF(X509) *certs, X509_STORE *st,
|
|
unsigned long flags);
|
|
static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id);
|
|
static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
|
|
unsigned long flags);
|
|
static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp,
|
|
OCSP_CERTID **ret);
|
|
static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
|
|
STACK_OF(OCSP_SINGLERESP) *sresp);
|
|
static int ocsp_check_delegated(X509 *x, int flags);
|
|
static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
|
|
X509_NAME *nm, STACK_OF(X509) *certs,
|
|
X509_STORE *st, unsigned long flags);
|
|
|
|
/* Verify a basic response message */
|
|
|
|
int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
|
|
X509_STORE *st, unsigned long flags)
|
|
{
|
|
X509 *signer, *x;
|
|
STACK_OF(X509) *chain = NULL;
|
|
X509_STORE_CTX ctx;
|
|
int i, ret = 0;
|
|
ret = ocsp_find_signer(&signer, bs, certs, st, flags);
|
|
if (!ret) {
|
|
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
|
|
OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
|
|
goto end;
|
|
}
|
|
if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
|
|
flags |= OCSP_NOVERIFY;
|
|
if (!(flags & OCSP_NOSIGS)) {
|
|
EVP_PKEY *skey;
|
|
skey = X509_get_pubkey(signer);
|
|
if (skey) {
|
|
ret = OCSP_BASICRESP_verify(bs, skey, 0);
|
|
EVP_PKEY_free(skey);
|
|
}
|
|
if (!skey || ret <= 0) {
|
|
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_SIGNATURE_FAILURE);
|
|
goto end;
|
|
}
|
|
}
|
|
if (!(flags & OCSP_NOVERIFY)) {
|
|
int init_res;
|
|
if (flags & OCSP_NOCHAIN)
|
|
init_res = X509_STORE_CTX_init(&ctx, st, signer, NULL);
|
|
else
|
|
init_res = X509_STORE_CTX_init(&ctx, st, signer, bs->certs);
|
|
if (!init_res) {
|
|
ret = -1;
|
|
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, ERR_R_X509_LIB);
|
|
goto end;
|
|
}
|
|
|
|
X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
|
|
ret = X509_verify_cert(&ctx);
|
|
chain = X509_STORE_CTX_get1_chain(&ctx);
|
|
X509_STORE_CTX_cleanup(&ctx);
|
|
if (ret <= 0) {
|
|
i = X509_STORE_CTX_get_error(&ctx);
|
|
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY,
|
|
OCSP_R_CERTIFICATE_VERIFY_ERROR);
|
|
ERR_add_error_data(2, "Verify error:",
|
|
X509_verify_cert_error_string(i));
|
|
goto end;
|
|
}
|
|
if (flags & OCSP_NOCHECKS) {
|
|
ret = 1;
|
|
goto end;
|
|
}
|
|
/*
|
|
* At this point we have a valid certificate chain need to verify it
|
|
* against the OCSP issuer criteria.
|
|
*/
|
|
ret = ocsp_check_issuer(bs, chain, flags);
|
|
|
|
/* If fatal error or valid match then finish */
|
|
if (ret != 0)
|
|
goto end;
|
|
|
|
/*
|
|
* Easy case: explicitly trusted. Get root CA and check for explicit
|
|
* trust
|
|
*/
|
|
if (flags & OCSP_NOEXPLICIT)
|
|
goto end;
|
|
|
|
x = sk_X509_value(chain, sk_X509_num(chain) - 1);
|
|
if (X509_check_trust(x, NID_OCSP_sign, 0) != X509_TRUST_TRUSTED) {
|
|
OCSPerr(OCSP_F_OCSP_BASIC_VERIFY, OCSP_R_ROOT_CA_NOT_TRUSTED);
|
|
goto end;
|
|
}
|
|
ret = 1;
|
|
}
|
|
|
|
end:
|
|
if (chain)
|
|
sk_X509_pop_free(chain, X509_free);
|
|
return ret;
|
|
}
|
|
|
|
static int ocsp_find_signer(X509 **psigner, OCSP_BASICRESP *bs,
|
|
STACK_OF(X509) *certs, X509_STORE *st,
|
|
unsigned long flags)
|
|
{
|
|
X509 *signer;
|
|
OCSP_RESPID *rid = bs->tbsResponseData->responderId;
|
|
if ((signer = ocsp_find_signer_sk(certs, rid))) {
|
|
*psigner = signer;
|
|
return 2;
|
|
}
|
|
if (!(flags & OCSP_NOINTERN) &&
|
|
(signer = ocsp_find_signer_sk(bs->certs, rid))) {
|
|
*psigner = signer;
|
|
return 1;
|
|
}
|
|
/* Maybe lookup from store if by subject name */
|
|
|
|
*psigner = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static X509 *ocsp_find_signer_sk(STACK_OF(X509) *certs, OCSP_RESPID *id)
|
|
{
|
|
int i;
|
|
unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
|
|
X509 *x;
|
|
|
|
/* Easy if lookup by name */
|
|
if (id->type == V_OCSP_RESPID_NAME)
|
|
return X509_find_by_subject(certs, id->value.byName);
|
|
|
|
/* Lookup by key hash */
|
|
|
|
/* If key hash isn't SHA1 length then forget it */
|
|
if (id->value.byKey->length != SHA_DIGEST_LENGTH)
|
|
return NULL;
|
|
keyhash = id->value.byKey->data;
|
|
/* Calculate hash of each key and compare */
|
|
for (i = 0; i < sk_X509_num(certs); i++) {
|
|
x = sk_X509_value(certs, i);
|
|
X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
|
|
if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
|
|
return x;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int ocsp_check_issuer(OCSP_BASICRESP *bs, STACK_OF(X509) *chain,
|
|
unsigned long flags)
|
|
{
|
|
STACK_OF(OCSP_SINGLERESP) *sresp;
|
|
X509 *signer, *sca;
|
|
OCSP_CERTID *caid = NULL;
|
|
int i;
|
|
sresp = bs->tbsResponseData->responses;
|
|
|
|
if (sk_X509_num(chain) <= 0) {
|
|
OCSPerr(OCSP_F_OCSP_CHECK_ISSUER, OCSP_R_NO_CERTIFICATES_IN_CHAIN);
|
|
return -1;
|
|
}
|
|
|
|
/* See if the issuer IDs match. */
|
|
i = ocsp_check_ids(sresp, &caid);
|
|
|
|
/* If ID mismatch or other error then return */
|
|
if (i <= 0)
|
|
return i;
|
|
|
|
signer = sk_X509_value(chain, 0);
|
|
/* Check to see if OCSP responder CA matches request CA */
|
|
if (sk_X509_num(chain) > 1) {
|
|
sca = sk_X509_value(chain, 1);
|
|
i = ocsp_match_issuerid(sca, caid, sresp);
|
|
if (i < 0)
|
|
return i;
|
|
if (i) {
|
|
/* We have a match, if extensions OK then success */
|
|
if (ocsp_check_delegated(signer, flags))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Otherwise check if OCSP request signed directly by request CA */
|
|
return ocsp_match_issuerid(signer, caid, sresp);
|
|
}
|
|
|
|
/*
|
|
* Check the issuer certificate IDs for equality. If there is a mismatch with
|
|
* the same algorithm then there's no point trying to match any certificates
|
|
* against the issuer. If the issuer IDs all match then we just need to check
|
|
* equality against one of them.
|
|
*/
|
|
|
|
static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) *sresp, OCSP_CERTID **ret)
|
|
{
|
|
OCSP_CERTID *tmpid, *cid;
|
|
int i, idcount;
|
|
|
|
idcount = sk_OCSP_SINGLERESP_num(sresp);
|
|
if (idcount <= 0) {
|
|
OCSPerr(OCSP_F_OCSP_CHECK_IDS,
|
|
OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
|
|
return -1;
|
|
}
|
|
|
|
cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
|
|
|
|
*ret = NULL;
|
|
|
|
for (i = 1; i < idcount; i++) {
|
|
tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
|
|
/* Check to see if IDs match */
|
|
if (OCSP_id_issuer_cmp(cid, tmpid)) {
|
|
/* If algoritm mismatch let caller deal with it */
|
|
if (OBJ_cmp(tmpid->hashAlgorithm->algorithm,
|
|
cid->hashAlgorithm->algorithm))
|
|
return 2;
|
|
/* Else mismatch */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* All IDs match: only need to check one ID */
|
|
*ret = cid;
|
|
return 1;
|
|
}
|
|
|
|
static int ocsp_match_issuerid(X509 *cert, OCSP_CERTID *cid,
|
|
STACK_OF(OCSP_SINGLERESP) *sresp)
|
|
{
|
|
/* If only one ID to match then do it */
|
|
if (cid) {
|
|
const EVP_MD *dgst;
|
|
X509_NAME *iname;
|
|
int mdlen;
|
|
unsigned char md[EVP_MAX_MD_SIZE];
|
|
if (!(dgst = EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) {
|
|
OCSPerr(OCSP_F_OCSP_MATCH_ISSUERID,
|
|
OCSP_R_UNKNOWN_MESSAGE_DIGEST);
|
|
return -1;
|
|
}
|
|
|
|
mdlen = EVP_MD_size(dgst);
|
|
if (mdlen < 0)
|
|
return -1;
|
|
if ((cid->issuerNameHash->length != mdlen) ||
|
|
(cid->issuerKeyHash->length != mdlen))
|
|
return 0;
|
|
iname = X509_get_subject_name(cert);
|
|
if (!X509_NAME_digest(iname, dgst, md, NULL))
|
|
return -1;
|
|
if (memcmp(md, cid->issuerNameHash->data, mdlen))
|
|
return 0;
|
|
X509_pubkey_digest(cert, dgst, md, NULL);
|
|
if (memcmp(md, cid->issuerKeyHash->data, mdlen))
|
|
return 0;
|
|
|
|
return 1;
|
|
|
|
} else {
|
|
/* We have to match the whole lot */
|
|
int i, ret;
|
|
OCSP_CERTID *tmpid;
|
|
for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
|
|
tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
|
|
ret = ocsp_match_issuerid(cert, tmpid, NULL);
|
|
if (ret <= 0)
|
|
return ret;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
}
|
|
|
|
static int ocsp_check_delegated(X509 *x, int flags)
|
|
{
|
|
X509_check_purpose(x, -1, 0);
|
|
if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN))
|
|
return 1;
|
|
OCSPerr(OCSP_F_OCSP_CHECK_DELEGATED, OCSP_R_MISSING_OCSPSIGNING_USAGE);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Verify an OCSP request. This is fortunately much easier than OCSP response
|
|
* verify. Just find the signers certificate and verify it against a given
|
|
* trust value.
|
|
*/
|
|
|
|
int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
|
|
X509_STORE *store, unsigned long flags)
|
|
{
|
|
X509 *signer;
|
|
X509_NAME *nm;
|
|
GENERAL_NAME *gen;
|
|
int ret;
|
|
X509_STORE_CTX ctx;
|
|
if (!req->optionalSignature) {
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
|
|
return 0;
|
|
}
|
|
gen = req->tbsRequest->requestorName;
|
|
if (!gen || gen->type != GEN_DIRNAME) {
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
|
|
OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
|
|
return 0;
|
|
}
|
|
nm = gen->d.directoryName;
|
|
ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
|
|
if (ret <= 0) {
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
|
|
OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
|
|
return 0;
|
|
}
|
|
if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
|
|
flags |= OCSP_NOVERIFY;
|
|
if (!(flags & OCSP_NOSIGS)) {
|
|
EVP_PKEY *skey;
|
|
skey = X509_get_pubkey(signer);
|
|
ret = OCSP_REQUEST_verify(req, skey);
|
|
EVP_PKEY_free(skey);
|
|
if (ret <= 0) {
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
|
|
return 0;
|
|
}
|
|
}
|
|
if (!(flags & OCSP_NOVERIFY)) {
|
|
int init_res;
|
|
if (flags & OCSP_NOCHAIN)
|
|
init_res = X509_STORE_CTX_init(&ctx, store, signer, NULL);
|
|
else
|
|
init_res = X509_STORE_CTX_init(&ctx, store, signer,
|
|
req->optionalSignature->certs);
|
|
if (!init_res) {
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
|
|
return 0;
|
|
}
|
|
|
|
X509_STORE_CTX_set_purpose(&ctx, X509_PURPOSE_OCSP_HELPER);
|
|
X509_STORE_CTX_set_trust(&ctx, X509_TRUST_OCSP_REQUEST);
|
|
ret = X509_verify_cert(&ctx);
|
|
X509_STORE_CTX_cleanup(&ctx);
|
|
if (ret <= 0) {
|
|
ret = X509_STORE_CTX_get_error(&ctx);
|
|
OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
|
|
OCSP_R_CERTIFICATE_VERIFY_ERROR);
|
|
ERR_add_error_data(2, "Verify error:",
|
|
X509_verify_cert_error_string(ret));
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int ocsp_req_find_signer(X509 **psigner, OCSP_REQUEST *req,
|
|
X509_NAME *nm, STACK_OF(X509) *certs,
|
|
X509_STORE *st, unsigned long flags)
|
|
{
|
|
X509 *signer;
|
|
if (!(flags & OCSP_NOINTERN)) {
|
|
signer = X509_find_by_subject(req->optionalSignature->certs, nm);
|
|
if (signer) {
|
|
*psigner = signer;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
signer = X509_find_by_subject(certs, nm);
|
|
if (signer) {
|
|
*psigner = signer;
|
|
return 2;
|
|
}
|
|
return 0;
|
|
}
|