1 /* $OpenBSD: x509_trs.c,v 1.58 2024/08/31 10:12:23 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
4 */
5 /* ====================================================================
6 * Copyright (c) 1999 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 <stdio.h>
60
61 #include <openssl/asn1.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65
66 #include "x509_internal.h"
67 #include "x509_local.h"
68
69 static int
trust_if_self_signed(const X509 * x)70 trust_if_self_signed(const X509 *x)
71 {
72 /* Extensions already cached in X509_check_trust(). */
73 if ((x->ex_flags & EXFLAG_SS) != 0)
74 return X509_TRUST_TRUSTED;
75
76 return X509_TRUST_UNTRUSTED;
77 }
78
79 static int
trust_was_set(const X509 * x)80 trust_was_set(const X509 *x)
81 {
82 return x->aux != NULL && (x->aux->trust != NULL ||
83 x->aux->reject != NULL);
84 }
85
86 static int
obj_trust(int id,const X509 * x)87 obj_trust(int id, const X509 *x)
88 {
89 const X509_CERT_AUX *aux;
90 ASN1_OBJECT *obj;
91 int i, nid;
92
93 if ((aux = x->aux) == NULL)
94 return X509_TRUST_UNTRUSTED;
95
96 for (i = 0; i < sk_ASN1_OBJECT_num(aux->reject); i++) {
97 obj = sk_ASN1_OBJECT_value(aux->reject, i);
98 nid = OBJ_obj2nid(obj);
99 if (nid == id || nid == NID_anyExtendedKeyUsage)
100 return X509_TRUST_REJECTED;
101 }
102
103 for (i = 0; i < sk_ASN1_OBJECT_num(aux->trust); i++) {
104 obj = sk_ASN1_OBJECT_value(aux->trust, i);
105 nid = OBJ_obj2nid(obj);
106 if (nid == id || nid == NID_anyExtendedKeyUsage)
107 return X509_TRUST_TRUSTED;
108 }
109
110 return X509_TRUST_UNTRUSTED;
111 }
112
113 static int
nid_from_trust_id(int trust_id)114 nid_from_trust_id(int trust_id)
115 {
116 OPENSSL_assert(trust_id == 0 ||
117 (trust_id >= X509_TRUST_MIN && trust_id <= X509_TRUST_MAX));
118
119 switch (trust_id) {
120 case X509_TRUST_COMPAT:
121 return NID_undef;
122 case X509_TRUST_SSL_CLIENT:
123 return NID_client_auth;
124 case X509_TRUST_SSL_SERVER:
125 return NID_server_auth;
126 case X509_TRUST_EMAIL:
127 return NID_email_protect;
128 case X509_TRUST_OBJECT_SIGN:
129 return NID_code_sign;
130 case X509_TRUST_OCSP_SIGN:
131 return NID_OCSP_sign;
132 case X509_TRUST_OCSP_REQUEST:
133 return NID_ad_OCSP;
134 case X509_TRUST_TSA:
135 return NID_time_stamp;
136 default:
137 return NID_undef;
138 }
139 }
140
141 int
X509_check_trust(X509 * x,int trust_id,int flags)142 X509_check_trust(X509 *x, int trust_id, int flags)
143 {
144 int rv;
145
146 /* Call early so the trust handlers don't need to modify the certs. */
147 if (!x509v3_cache_extensions(x))
148 return X509_TRUST_UNTRUSTED;
149
150 if (trust_id == X509_TRUST_ACCEPT_ALL)
151 return 1;
152
153 switch (trust_id) {
154 case X509_TRUST_COMPAT:
155 return trust_if_self_signed(x);
156 case X509_TRUST_EMAIL:
157 case X509_TRUST_OBJECT_SIGN:
158 case X509_TRUST_SSL_SERVER:
159 case X509_TRUST_SSL_CLIENT:
160 case X509_TRUST_TSA:
161 if (trust_was_set(x))
162 return obj_trust(nid_from_trust_id(trust_id), x);
163 return trust_if_self_signed(x);
164 case X509_TRUST_OCSP_SIGN:
165 case X509_TRUST_OCSP_REQUEST:
166 return obj_trust(nid_from_trust_id(trust_id), x);
167 default:
168 rv = obj_trust(NID_anyExtendedKeyUsage, x);
169 if (rv != X509_TRUST_UNTRUSTED)
170 return rv;
171 return trust_if_self_signed(x);
172 }
173 }
174