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/* $OpenBSD: x509_trs.c,v 1.56 2024/07/12 15:53:51 beck Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 1999.
*/
/* ====================================================================
* Copyright (c) 1999 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 <stdio.h>
#include <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "x509_internal.h"
#include "x509_local.h"
static int
obj_trust(int id, const X509 *x)
{
const X509_CERT_AUX *aux;
ASN1_OBJECT *obj;
int i, nid;
if ((aux = x->aux) == NULL)
return X509_TRUST_UNTRUSTED;
for (i = 0; i < sk_ASN1_OBJECT_num(aux->reject); i++) {
obj = sk_ASN1_OBJECT_value(aux->reject, i);
nid = OBJ_obj2nid(obj);
if (nid == id || nid == NID_anyExtendedKeyUsage)
return X509_TRUST_REJECTED;
}
for (i = 0; i < sk_ASN1_OBJECT_num(aux->trust); i++) {
obj = sk_ASN1_OBJECT_value(aux->trust, i);
nid = OBJ_obj2nid(obj);
if (nid == id || nid == NID_anyExtendedKeyUsage)
return X509_TRUST_TRUSTED;
}
return X509_TRUST_UNTRUSTED;
}
static int
trust_if_self_signed(const X509 *x)
{
/* Extensions already cached in X509_check_trust(). */
if ((x->ex_flags & EXFLAG_SS) != 0)
return X509_TRUST_TRUSTED;
return X509_TRUST_UNTRUSTED;
}
static int
trust_1oidany(int nid, const X509 *x)
{
/* Inspect the certificate's trust settings if there are any. */
if (x->aux != NULL && (x->aux->trust != NULL || x->aux->reject != NULL))
return obj_trust(nid, x);
/* For compatibility we return trusted if the cert is self signed. */
return trust_if_self_signed(x);
}
static int
trust_1oid(int nid, const X509 *x)
{
if (x->aux != NULL)
return obj_trust(nid, x);
return X509_TRUST_UNTRUSTED;
}
int
X509_check_trust(X509 *x, int trust_id, int flags)
{
int rv;
if (trust_id == -1)
return 1;
/* Call early so the trust handlers don't need to modify the certs. */
if (!x509v3_cache_extensions(x))
return X509_TRUST_UNTRUSTED;
switch (trust_id) {
case 0: /*
* The default behaviour: If the certificate has EKU any, or it
* is self-signed, it is trusted. Otherwise it is untrusted.
*/
rv = obj_trust(NID_anyExtendedKeyUsage, x);
if (rv != X509_TRUST_UNTRUSTED)
return rv;
return trust_if_self_signed(x);
case X509_TRUST_COMPAT:
return trust_if_self_signed(x);
case X509_TRUST_SSL_CLIENT:
return trust_1oidany(NID_client_auth, x);
case X509_TRUST_SSL_SERVER:
return trust_1oidany(NID_server_auth, x);
case X509_TRUST_EMAIL:
return trust_1oidany(NID_email_protect, x);
case X509_TRUST_OBJECT_SIGN:
return trust_1oidany(NID_code_sign, x);
case X509_TRUST_OCSP_SIGN:
return trust_1oid(NID_OCSP_sign, x);
case X509_TRUST_OCSP_REQUEST:
return trust_1oid(NID_ad_OCSP, x);
case X509_TRUST_TSA:
return trust_1oidany(NID_time_stamp, x);
default:
return obj_trust(trust_id, x);
}
}
LCRYPTO_ALIAS(X509_check_trust);
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