1 /* x509_trs.c */ 2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 #include "cryptlib.h" 61 #include <openssl/x509v3.h> 62 63 64 static int tr_cmp(const X509_TRUST * const *a, 65 const X509_TRUST * const *b); 66 static void trtable_free(X509_TRUST *p); 67 68 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags); 69 static int trust_compat(X509_TRUST *trust, X509 *x, int flags); 70 71 static int obj_trust(int id, X509 *x, int flags); 72 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust; 73 74 /* WARNING: the following table should be kept in order of trust 75 * and without any gaps so we can just subtract the minimum trust 76 * value to get an index into the table 77 */ 78 79 static X509_TRUST trstandard[] = { 80 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL}, 81 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL}, 82 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Client", NID_server_auth, NULL}, 83 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL}, 84 }; 85 86 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 87 88 IMPLEMENT_STACK_OF(X509_TRUST) 89 90 static STACK_OF(X509_TRUST) *trtable = NULL; 91 92 static int tr_cmp(const X509_TRUST * const *a, 93 const X509_TRUST * const *b) 94 { 95 return (*a)->trust - (*b)->trust; 96 } 97 98 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 99 { 100 int (*oldtrust)(int , X509 *, int); 101 oldtrust = default_trust; 102 default_trust = trust; 103 return oldtrust; 104 } 105 106 107 int X509_check_trust(X509 *x, int id, int flags) 108 { 109 X509_TRUST *pt; 110 int idx; 111 if(id == -1) return 1; 112 idx = X509_TRUST_get_by_id(id); 113 if(idx == -1) return default_trust(id, x, flags); 114 pt = X509_TRUST_get0(idx); 115 return pt->check_trust(pt, x, flags); 116 } 117 118 int X509_TRUST_get_count(void) 119 { 120 if(!trtable) return X509_TRUST_COUNT; 121 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 122 } 123 124 X509_TRUST * X509_TRUST_get0(int idx) 125 { 126 if(idx < 0) return NULL; 127 if(idx < X509_TRUST_COUNT) return trstandard + idx; 128 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 129 } 130 131 int X509_TRUST_get_by_id(int id) 132 { 133 X509_TRUST tmp; 134 int idx; 135 if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 136 return id - X509_TRUST_MIN; 137 tmp.trust = id; 138 if(!trtable) return -1; 139 idx = sk_X509_TRUST_find(trtable, &tmp); 140 if(idx == -1) return -1; 141 return idx + X509_TRUST_COUNT; 142 } 143 144 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 145 char *name, int arg1, void *arg2) 146 { 147 int idx; 148 X509_TRUST *trtmp; 149 /* This is set according to what we change: application can't set it */ 150 flags &= ~X509_TRUST_DYNAMIC; 151 /* This will always be set for application modified trust entries */ 152 flags |= X509_TRUST_DYNAMIC_NAME; 153 /* Get existing entry if any */ 154 idx = X509_TRUST_get_by_id(id); 155 /* Need a new entry */ 156 if(idx == -1) { 157 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) { 158 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 159 return 0; 160 } 161 trtmp->flags = X509_TRUST_DYNAMIC; 162 } else trtmp = X509_TRUST_get0(idx); 163 164 /* OPENSSL_free existing name if dynamic */ 165 if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name); 166 /* dup supplied name */ 167 if(!(trtmp->name = BUF_strdup(name))) { 168 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 169 return 0; 170 } 171 /* Keep the dynamic flag of existing entry */ 172 trtmp->flags &= X509_TRUST_DYNAMIC; 173 /* Set all other flags */ 174 trtmp->flags |= flags; 175 176 trtmp->trust = id; 177 trtmp->check_trust = ck; 178 trtmp->arg1 = arg1; 179 trtmp->arg2 = arg2; 180 181 /* If its a new entry manage the dynamic table */ 182 if(idx == -1) { 183 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { 184 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 185 return 0; 186 } 187 if (!sk_X509_TRUST_push(trtable, trtmp)) { 188 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 189 return 0; 190 } 191 } 192 return 1; 193 } 194 195 static void trtable_free(X509_TRUST *p) 196 { 197 if(!p) return; 198 if (p->flags & X509_TRUST_DYNAMIC) 199 { 200 if (p->flags & X509_TRUST_DYNAMIC_NAME) 201 OPENSSL_free(p->name); 202 OPENSSL_free(p); 203 } 204 } 205 206 void X509_TRUST_cleanup(void) 207 { 208 int i; 209 for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i); 210 sk_X509_TRUST_pop_free(trtable, trtable_free); 211 trtable = NULL; 212 } 213 214 int X509_TRUST_get_flags(X509_TRUST *xp) 215 { 216 return xp->flags; 217 } 218 219 char *X509_TRUST_get0_name(X509_TRUST *xp) 220 { 221 return xp->name; 222 } 223 224 int X509_TRUST_get_trust(X509_TRUST *xp) 225 { 226 return xp->trust; 227 } 228 229 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 230 { 231 if(x->aux) return obj_trust(trust->arg1, x, flags); 232 /* we don't have any trust settings: for compatibility 233 * we return trusted if it is self signed 234 */ 235 return trust_compat(trust, x, flags); 236 } 237 238 static int trust_compat(X509_TRUST *trust, X509 *x, int flags) 239 { 240 X509_check_purpose(x, -1, 0); 241 if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED; 242 else return X509_TRUST_UNTRUSTED; 243 } 244 245 static int obj_trust(int id, X509 *x, int flags) 246 { 247 ASN1_OBJECT *obj; 248 int i; 249 X509_CERT_AUX *ax; 250 ax = x->aux; 251 if(!ax) return X509_TRUST_UNTRUSTED; 252 if(ax->reject) { 253 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 254 obj = sk_ASN1_OBJECT_value(ax->reject, i); 255 if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED; 256 } 257 } 258 if(ax->trust) { 259 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 260 obj = sk_ASN1_OBJECT_value(ax->trust, i); 261 if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED; 262 } 263 } 264 return X509_TRUST_UNTRUSTED; 265 } 266 267