/* $OpenBSD: x509_trs.c,v 1.52 2024/03/25 02:18:35 tb 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 #include #include #include #include #include #include "crypto_internal.h" #include "x509_internal.h" #include "x509_local.h" typedef struct x509_trust_st { int trust; int (*check_trust)(int, const X509 *); int nid; } X509_TRUST; static int obj_trust(int id, const X509 *x) { ASN1_OBJECT *obj; int i, nid; const X509_CERT_AUX *aux; 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_compat(int nid, const X509 *x) { /* Extensions already cached in X509_check_trust(). */ if (x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED; else return X509_TRUST_UNTRUSTED; } static int trust_1oidany(int nid, const X509 *x) { if (x->aux && (x->aux->trust || x->aux->reject)) return obj_trust(nid, x); /* we don't have any trust settings: for compatibility * we return trusted if it is self signed */ return trust_compat(NID_undef, x); } static int trust_1oid(int nid, const X509 *x) { if (x->aux) return obj_trust(nid, x); return X509_TRUST_UNTRUSTED; } /* WARNING: the following table should be kept in order of trust * and without any gaps so we can just subtract the minimum trust * value to get an index into the table */ static const X509_TRUST trstandard[] = { { .trust = X509_TRUST_COMPAT, .check_trust = trust_compat, }, { .trust = X509_TRUST_SSL_CLIENT, .check_trust = trust_1oidany, .nid = NID_client_auth, }, { .trust = X509_TRUST_SSL_SERVER, .check_trust = trust_1oidany, .nid = NID_server_auth, }, { .trust = X509_TRUST_EMAIL, .check_trust = trust_1oidany, .nid = NID_email_protect, }, { .trust = X509_TRUST_OBJECT_SIGN, .check_trust = trust_1oidany, .nid = NID_code_sign, }, { .trust = X509_TRUST_OCSP_SIGN, .check_trust = trust_1oid, .nid = NID_OCSP_sign, }, { .trust = X509_TRUST_OCSP_REQUEST, .check_trust = trust_1oid, .nid = NID_ad_OCSP, }, { .trust = X509_TRUST_TSA, .check_trust = trust_1oidany, .nid = NID_time_stamp, }, }; #define X509_TRUST_COUNT (sizeof(trstandard) / sizeof(trstandard[0])) CTASSERT(X509_TRUST_MIN == 1 && X509_TRUST_MAX == X509_TRUST_COUNT); int X509_check_trust(X509 *x, int trust_id, int flags) { const X509_TRUST *trust; int idx; 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; /* * XXX beck/jsing This enables self signed certs to be trusted for * an unspecified id/trust flag value (this is NOT the * X509_TRUST_DEFAULT), which was the longstanding * openssl behaviour. boringssl does not have this behaviour. * * This should be revisited, but changing the default "not default" * may break things. */ if (trust_id == 0) { int rv; rv = obj_trust(NID_anyExtendedKeyUsage, x); if (rv != X509_TRUST_UNTRUSTED) return rv; return trust_compat(NID_undef, x); } if (trust_id < X509_TRUST_MIN || trust_id > X509_TRUST_MAX) return obj_trust(trust_id, x); idx = trust_id - X509_TRUST_MIN; trust = &trstandard[idx]; return trust->check_trust(trust->nid, x); } LCRYPTO_ALIAS(X509_check_trust);