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 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 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 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 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 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