Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/ocsp/ocsp_vfy.c	Lines:	88	208	42.3 %
Date:	2017-11-07	Branches:	42	140	30.0 %


/* $OpenBSD: ocsp_vfy.c,v 1.15 2017/01/29 17:49:23 beck Exp $ */
/* 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 <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;
	STACK_OF(X509) *untrusted = NULL;
	X509_STORE_CTX ctx;
	int i, ret = 0;

	ret = ocsp_find_signer(&signer, bs, certs, st, flags);
	if (!ret) {
		OCSPerror(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) {
			OCSPerror(OCSP_R_SIGNATURE_FAILURE);
			goto end;
		}
	}
	if (!(flags & OCSP_NOVERIFY)) {
		int init_res;

		if (flags & OCSP_NOCHAIN) {
			untrusted = NULL;
		} else if (bs->certs && certs) {
			untrusted = sk_X509_dup(bs->certs);
			for (i = 0; i < sk_X509_num(certs); i++) {
				if (!sk_X509_push(untrusted,
					sk_X509_value(certs, i))) {
					OCSPerror(ERR_R_MALLOC_FAILURE);
					goto end;
				}
			}
		} else
			untrusted = bs->certs;
		init_res = X509_STORE_CTX_init(&ctx, st, signer, untrusted);
		if (!init_res) {
			ret = -1;
			OCSPerror(ERR_R_X509_LIB);
			goto end;
		}

		if (X509_STORE_CTX_set_purpose(&ctx,
		    X509_PURPOSE_OCSP_HELPER) == 0) {
			X509_STORE_CTX_cleanup(&ctx);
			ret = -1;
			goto end;
		}
		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);
			OCSPerror(OCSP_R_CERTIFICATE_VERIFY_ERROR);
			ERR_asprintf_error_data("Verify error:%s",
			    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) {
			OCSPerror(OCSP_R_ROOT_CA_NOT_TRUSTED);
			goto end;
		}
		ret = 1;
	}

end:
	if (chain)
		sk_X509_pop_free(chain, X509_free);
	if (bs->certs && certs)
		sk_X509_free(untrusted);
	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) {
		OCSPerror(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) {
		OCSPerror(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)) {
			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))) {
			OCSPerror(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;
	OCSPerror(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) {
		OCSPerror(OCSP_R_REQUEST_NOT_SIGNED);
		return 0;
	}
	gen = req->tbsRequest->requestorName;
	if (!gen || gen->type != GEN_DIRNAME) {
		OCSPerror(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) {
		OCSPerror(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) {
			OCSPerror(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) {
			OCSPerror(ERR_R_X509_LIB);
			return 0;
		}

		if (X509_STORE_CTX_set_purpose(&ctx,
		      X509_PURPOSE_OCSP_HELPER) == 0 ||
		    X509_STORE_CTX_set_trust(&ctx,
		      X509_TRUST_OCSP_REQUEST) == 0) {
			X509_STORE_CTX_cleanup(&ctx);
			return 0;
		}
		ret = X509_verify_cert(&ctx);
		X509_STORE_CTX_cleanup(&ctx);
		if (ret <= 0) {
			ret = X509_STORE_CTX_get_error(&ctx);
			OCSPerror(OCSP_R_CERTIFICATE_VERIFY_ERROR);
			ERR_asprintf_error_data("Verify error:%s",
			    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;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ocsp_vfy.c,v 1.15 2017/01/29 17:49:23 beck Exp $ */
2			/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3			* project 2000.
4			*/
5			/* ====================================================================
6			* Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
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
18			* distribution.
19			*
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/)"
24			*
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.
29			*
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.
33			*
34			* 6. Redistributions of any form whatsoever must retain the following
35			* acknowledgment:
36			* "This product includes software developed by the OpenSSL Project
37			* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38			*
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			* ====================================================================
52			*
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).
56			*
57			*/
58
59			#include <openssl/ocsp.h>
60			#include <openssl/err.h>
61			#include <string.h>
62
63			static int ocsp_find_signer(X509 *psigner, OCSP_BASICRESP bs,
64			STACK_OF(X509) certs, 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,
67			unsigned long flags);
68			static int ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) sresp, OCSP_CERTID *ret);
69			static int ocsp_match_issuerid(X509 cert, OCSP_CERTID cid,
70			STACK_OF(OCSP_SINGLERESP) *sresp);
71			static int ocsp_check_delegated(X509 *x, int flags);
72			static int ocsp_req_find_signer(X509 *psigner, OCSP_REQUEST req,
73			X509_NAME nm, STACK_OF(X509) certs, X509_STORE *st,
74			unsigned long flags);
75
76			/* Verify a basic response message */
77			int
78			OCSP_basic_verify(OCSP_BASICRESP bs, STACK_OF(X509) certs, X509_STORE *st,
79			unsigned long flags)
80			{
81		8	X509 signer, x;
82			STACK_OF(X509) *chain = NULL;
83			STACK_OF(X509) *untrusted = NULL;
84		4	X509_STORE_CTX ctx;
85			int i, ret = 0;
86
87		4	ret = ocsp_find_signer(&signer, bs, certs, st, flags);
88	✗✓	4	if (!ret) {
89			OCSPerror(OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
90			goto end;
91			}
92	✗✓✗✗	4	if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
93			flags \|= OCSP_NOVERIFY;
94	✓✗	4	if (!(flags & OCSP_NOSIGS)) {
95			EVP_PKEY *skey;
96
97		4	skey = X509_get_pubkey(signer);
98	✓✗	4	if (skey) {
99		4	ret = OCSP_BASICRESP_verify(bs, skey, 0);
100		4	EVP_PKEY_free(skey);
101		4	}
102	✗✓	4	if (!skey \|\| ret <= 0) {
103			OCSPerror(OCSP_R_SIGNATURE_FAILURE);
104			goto end;
105			}
106	✓✗✗	4	}
107	✓✗	4	if (!(flags & OCSP_NOVERIFY)) {
108			int init_res;
109
110	✗✓	4	if (flags & OCSP_NOCHAIN) {
111			untrusted = NULL;
112	✗✓	4	} else if (bs->certs && certs) {
113			untrusted = sk_X509_dup(bs->certs);
114			for (i = 0; i < sk_X509_num(certs); i++) {
115			if (!sk_X509_push(untrusted,
116			sk_X509_value(certs, i))) {
117			OCSPerror(ERR_R_MALLOC_FAILURE);
118			goto end;
119			}
120			}
121			} else
122			untrusted = bs->certs;
123		4	init_res = X509_STORE_CTX_init(&ctx, st, signer, untrusted);
124	✗✓	4	if (!init_res) {
125			ret = -1;
126			OCSPerror(ERR_R_X509_LIB);
127			goto end;
128			}
129
130	✗✓	8	if (X509_STORE_CTX_set_purpose(&ctx,
131		4	X509_PURPOSE_OCSP_HELPER) == 0) {
132			X509_STORE_CTX_cleanup(&ctx);
133			ret = -1;
134			goto end;
135			}
136		4	ret = X509_verify_cert(&ctx);
137		4	chain = X509_STORE_CTX_get1_chain(&ctx);
138		4	X509_STORE_CTX_cleanup(&ctx);
139	✗✓	4	if (ret <= 0) {
140			i = X509_STORE_CTX_get_error(&ctx);
141			OCSPerror(OCSP_R_CERTIFICATE_VERIFY_ERROR);
142			ERR_asprintf_error_data("Verify error:%s",
143			X509_verify_cert_error_string(i));
144			goto end;
145			}
146	✗✓	4	if (flags & OCSP_NOCHECKS) {
147			ret = 1;
148			goto end;
149			}
150			/* At this point we have a valid certificate chain
151			* need to verify it against the OCSP issuer criteria.
152			*/
153		4	ret = ocsp_check_issuer(bs, chain, flags);
154
155			/* If fatal error or valid match then finish */
156	✓✗	4	if (ret != 0)
157		4	goto end;
158
159			/* Easy case: explicitly trusted. Get root CA and
160			* check for explicit trust
161			*/
162			if (flags & OCSP_NOEXPLICIT)
163			goto end;
164
165			x = sk_X509_value(chain, sk_X509_num(chain) - 1);
166			if (X509_check_trust(x, NID_OCSP_sign, 0) !=
167			X509_TRUST_TRUSTED) {
168			OCSPerror(OCSP_R_ROOT_CA_NOT_TRUSTED);
169			goto end;
170			}
171			ret = 1;
172			}
173
174			end:
175	✓✗	4	if (chain)
176		4	sk_X509_pop_free(chain, X509_free);
177	✗✓	4	if (bs->certs && certs)
178			sk_X509_free(untrusted);
179		4	return ret;
180		4	}
181
182			static int
183			ocsp_find_signer(X509 *psigner, OCSP_BASICRESP bs, STACK_OF(X509) *certs,
184			X509_STORE *st, unsigned long flags)
185			{
186			X509 *signer;
187		8	OCSP_RESPID *rid = bs->tbsResponseData->responderId;
188
189	✗✓	4	if ((signer = ocsp_find_signer_sk(certs, rid))) {
190			*psigner = signer;
191			return 2;
192			}
193	✓✗✓✗	8	if (!(flags & OCSP_NOINTERN) &&
194		4	(signer = ocsp_find_signer_sk(bs->certs, rid))) {
195		4	*psigner = signer;
196		4	return 1;
197			}
198			/* Maybe lookup from store if by subject name */
199
200			*psigner = NULL;
201			return 0;
202		4	}
203
204			static X509 *
205			ocsp_find_signer_sk(STACK_OF(X509) certs, OCSP_RESPID id)
206			{
207			int i;
208		16	unsigned char tmphash[SHA_DIGEST_LENGTH], *keyhash;
209			X509 *x;
210
211			/* Easy if lookup by name */
212	✓✗	8	if (id->type == V_OCSP_RESPID_NAME)
213		8	return X509_find_by_subject(certs, id->value.byName);
214
215			/* Lookup by key hash */
216
217			/* If key hash isn't SHA1 length then forget it */
218			if (id->value.byKey->length != SHA_DIGEST_LENGTH)
219			return NULL;
220			keyhash = id->value.byKey->data;
221			/* Calculate hash of each key and compare */
222			for (i = 0; i < sk_X509_num(certs); i++) {
223			x = sk_X509_value(certs, i);
224			X509_pubkey_digest(x, EVP_sha1(), tmphash, NULL);
225			if (!memcmp(keyhash, tmphash, SHA_DIGEST_LENGTH))
226			return x;
227			}
228			return NULL;
229		8	}
230
231			static int
232			ocsp_check_issuer(OCSP_BASICRESP bs, STACK_OF(X509) chain,
233			unsigned long flags)
234			{
235			STACK_OF(OCSP_SINGLERESP) *sresp;
236			X509 signer, sca;
237		8	OCSP_CERTID *caid = NULL;
238			int i;
239
240		4	sresp = bs->tbsResponseData->responses;
241
242	✗✓	4	if (sk_X509_num(chain) <= 0) {
243			OCSPerror(OCSP_R_NO_CERTIFICATES_IN_CHAIN);
244			return -1;
245			}
246
247			/* See if the issuer IDs match. */
248		4	i = ocsp_check_ids(sresp, &caid);
249
250			/* If ID mismatch or other error then return */
251	✗✓	4	if (i <= 0)
252			return i;
253
254		4	signer = sk_X509_value(chain, 0);
255			/* Check to see if OCSP responder CA matches request CA */
256	✓✗	4	if (sk_X509_num(chain) > 1) {
257		4	sca = sk_X509_value(chain, 1);
258		4	i = ocsp_match_issuerid(sca, caid, sresp);
259	✗✓	4	if (i < 0)
260			return i;
261	✓✗	4	if (i) {
262			/* We have a match, if extensions OK then success */
263	✓✗	4	if (ocsp_check_delegated(signer, flags))
264		4	return 1;
265			return 0;
266			}
267			}
268
269			/* Otherwise check if OCSP request signed directly by request CA */
270			return ocsp_match_issuerid(signer, caid, sresp);
271		4	}
272
273			/* Check the issuer certificate IDs for equality. If there is a mismatch with the same
274			* algorithm then there's no point trying to match any certificates against the issuer.
275			* If the issuer IDs all match then we just need to check equality against one of them.
276			*/
277			static int
278			ocsp_check_ids(STACK_OF(OCSP_SINGLERESP) sresp, OCSP_CERTID *ret)
279			{
280			OCSP_CERTID tmpid, cid;
281			int i, idcount;
282
283		8	idcount = sk_OCSP_SINGLERESP_num(sresp);
284	✗✓	4	if (idcount <= 0) {
285			OCSPerror(OCSP_R_RESPONSE_CONTAINS_NO_REVOCATION_DATA);
286			return -1;
287			}
288
289		4	cid = sk_OCSP_SINGLERESP_value(sresp, 0)->certId;
290
291		4	*ret = NULL;
292
293	✓✓	16	for (i = 1; i < idcount; i++) {
294		4	tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
295			/* Check to see if IDs match */
296	✗✓	4	if (OCSP_id_issuer_cmp(cid, tmpid)) {
297			return 0;
298			}
299			}
300
301			/* All IDs match: only need to check one ID */
302		4	*ret = cid;
303		4	return 1;
304		4	}
305
306			static int
307			ocsp_match_issuerid(X509 cert, OCSP_CERTID cid,
308			STACK_OF(OCSP_SINGLERESP) *sresp)
309			{
310			/* If only one ID to match then do it */
311	✓✗	8	if (cid) {
312			const EVP_MD *dgst;
313			X509_NAME *iname;
314			int mdlen;
315		4	unsigned char md[EVP_MAX_MD_SIZE];
316
317	✗✓	4	if (!(dgst =
318		4	EVP_get_digestbyobj(cid->hashAlgorithm->algorithm))) {
319			OCSPerror(OCSP_R_UNKNOWN_MESSAGE_DIGEST);
320			return -1;
321			}
322
323		4	mdlen = EVP_MD_size(dgst);
324	✗✓	4	if (mdlen < 0)
325			return -1;
326	✓✗✗✓	8	if (cid->issuerNameHash->length != mdlen \|\|
327		4	cid->issuerKeyHash->length != mdlen)
328			return 0;
329		4	iname = X509_get_subject_name(cert);
330	✗✓	4	if (!X509_NAME_digest(iname, dgst, md, NULL))
331			return -1;
332	✗✓	4	if (memcmp(md, cid->issuerNameHash->data, mdlen))
333			return 0;
334		4	X509_pubkey_digest(cert, dgst, md, NULL);
335	✗✓	4	if (memcmp(md, cid->issuerKeyHash->data, mdlen))
336			return 0;
337
338		4	return 1;
339		4	} else {
340			/* We have to match the whole lot */
341			int i, ret;
342			OCSP_CERTID *tmpid;
343
344			for (i = 0; i < sk_OCSP_SINGLERESP_num(sresp); i++) {
345			tmpid = sk_OCSP_SINGLERESP_value(sresp, i)->certId;
346			ret = ocsp_match_issuerid(cert, tmpid, NULL);
347			if (ret <= 0)
348			return ret;
349			}
350			return 1;
351			}
352		4	}
353
354			static int
355			ocsp_check_delegated(X509 *x, int flags)
356			{
357		8	X509_check_purpose(x, -1, 0);
358	✓✗✓✗	8	if ((x->ex_flags & EXFLAG_XKUSAGE) && (x->ex_xkusage & XKU_OCSP_SIGN))
359		4	return 1;
360			OCSPerror(OCSP_R_MISSING_OCSPSIGNING_USAGE);
361			return 0;
362		4	}
363
364			/* Verify an OCSP request. This is fortunately much easier than OCSP
365			* response verify. Just find the signers certificate and verify it
366			* against a given trust value.
367			*/
368			int
369			OCSP_request_verify(OCSP_REQUEST req, STACK_OF(X509) certs, X509_STORE *store,
370			unsigned long flags)
371			{
372			X509 *signer;
373			X509_NAME *nm;
374			GENERAL_NAME *gen;
375			int ret;
376			X509_STORE_CTX ctx;
377
378			if (!req->optionalSignature) {
379			OCSPerror(OCSP_R_REQUEST_NOT_SIGNED);
380			return 0;
381			}
382			gen = req->tbsRequest->requestorName;
383			if (!gen \|\| gen->type != GEN_DIRNAME) {
384			OCSPerror(OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
385			return 0;
386			}
387			nm = gen->d.directoryName;
388			ret = ocsp_req_find_signer(&signer, req, nm, certs, store, flags);
389			if (ret <= 0) {
390			OCSPerror(OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
391			return 0;
392			}
393			if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
394			flags \|= OCSP_NOVERIFY;
395			if (!(flags & OCSP_NOSIGS)) {
396			EVP_PKEY *skey;
397
398			skey = X509_get_pubkey(signer);
399			ret = OCSP_REQUEST_verify(req, skey);
400			EVP_PKEY_free(skey);
401			if (ret <= 0) {
402			OCSPerror(OCSP_R_SIGNATURE_FAILURE);
403			return 0;
404			}
405			}
406			if (!(flags & OCSP_NOVERIFY)) {
407			int init_res;
408
409			if (flags & OCSP_NOCHAIN)
410			init_res = X509_STORE_CTX_init(&ctx, store, signer,
411			NULL);
412			else
413			init_res = X509_STORE_CTX_init(&ctx, store, signer,
414			req->optionalSignature->certs);
415			if (!init_res) {
416			OCSPerror(ERR_R_X509_LIB);
417			return 0;
418			}
419
420			if (X509_STORE_CTX_set_purpose(&ctx,
421			X509_PURPOSE_OCSP_HELPER) == 0 \|\|
422			X509_STORE_CTX_set_trust(&ctx,
423			X509_TRUST_OCSP_REQUEST) == 0) {
424			X509_STORE_CTX_cleanup(&ctx);
425			return 0;
426			}
427			ret = X509_verify_cert(&ctx);
428			X509_STORE_CTX_cleanup(&ctx);
429			if (ret <= 0) {
430			ret = X509_STORE_CTX_get_error(&ctx);
431			OCSPerror(OCSP_R_CERTIFICATE_VERIFY_ERROR);
432			ERR_asprintf_error_data("Verify error:%s",
433			X509_verify_cert_error_string(ret));
434			return 0;
435			}
436			}
437			return 1;
438			}
439
440			static int
441			ocsp_req_find_signer(X509 *psigner, OCSP_REQUEST req, X509_NAME *nm,
442			STACK_OF(X509) certs, X509_STORE st, unsigned long flags)
443			{
444			X509 *signer;
445
446			if (!(flags & OCSP_NOINTERN)) {
447			signer = X509_find_by_subject(req->optionalSignature->certs, nm);
448			if (signer) {
449			*psigner = signer;
450			return 1;
451			}
452			}
453
454			signer = X509_find_by_subject(certs, nm);
455			if (signer) {
456			*psigner = signer;
457			return 2;
458			}
459			return 0;
460			}