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_1oid(X509_TRUST *trust, X509 *x, int flags); 70 static int trust_compat(X509_TRUST *trust, X509 *x, int flags); 71 72 static int obj_trust(int id, X509 *x, int flags); 73 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust; 74 75 /* WARNING: the following table should be kept in order of trust 76 * and without any gaps so we can just subtract the minimum trust 77 * value to get an index into the table 78 */ 79 80 static X509_TRUST trstandard[] = { 81 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL}, 82 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL}, 83 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth, NULL}, 84 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL}, 85 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL}, 86 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL} 87 }; 88 89 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 90 91 IMPLEMENT_STACK_OF(X509_TRUST) 92 93 static STACK_OF(X509_TRUST) *trtable = NULL; 94 95 static int tr_cmp(const X509_TRUST * const *a, 96 const X509_TRUST * const *b) 97 { 98 return (*a)->trust - (*b)->trust; 99 } 100 101 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 102 { 103 int (*oldtrust)(int , X509 *, int); 104 oldtrust = default_trust; 105 default_trust = trust; 106 return oldtrust; 107 } 108 109 110 int X509_check_trust(X509 *x, int id, int flags) 111 { 112 X509_TRUST *pt; 113 int idx; 114 if(id == -1) return 1; 115 idx = X509_TRUST_get_by_id(id); 116 if(idx == -1) return default_trust(id, x, flags); 117 pt = X509_TRUST_get0(idx); 118 return pt->check_trust(pt, x, flags); 119 } 120 121 int X509_TRUST_get_count(void) 122 { 123 if(!trtable) return X509_TRUST_COUNT; 124 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 125 } 126 127 X509_TRUST * X509_TRUST_get0(int idx) 128 { 129 if(idx < 0) return NULL; 130 if(idx < X509_TRUST_COUNT) return trstandard + idx; 131 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 132 } 133 134 int X509_TRUST_get_by_id(int id) 135 { 136 X509_TRUST tmp; 137 int idx; 138 if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 139 return id - X509_TRUST_MIN; 140 tmp.trust = id; 141 if(!trtable) return -1; 142 idx = sk_X509_TRUST_find(trtable, &tmp); 143 if(idx == -1) return -1; 144 return idx + X509_TRUST_COUNT; 145 } 146 147 int X509_TRUST_set(int *t, int trust) 148 { 149 if(X509_TRUST_get_by_id(trust) == -1) { 150 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST); 151 return 0; 152 } 153 *t = trust; 154 return 1; 155 } 156 157 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 158 char *name, int arg1, void *arg2) 159 { 160 int idx; 161 X509_TRUST *trtmp; 162 /* This is set according to what we change: application can't set it */ 163 flags &= ~X509_TRUST_DYNAMIC; 164 /* This will always be set for application modified trust entries */ 165 flags |= X509_TRUST_DYNAMIC_NAME; 166 /* Get existing entry if any */ 167 idx = X509_TRUST_get_by_id(id); 168 /* Need a new entry */ 169 if(idx == -1) { 170 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) { 171 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 172 return 0; 173 } 174 trtmp->flags = X509_TRUST_DYNAMIC; 175 } else trtmp = X509_TRUST_get0(idx); 176 177 /* OPENSSL_free existing name if dynamic */ 178 if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name); 179 /* dup supplied name */ 180 if(!(trtmp->name = BUF_strdup(name))) { 181 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 182 return 0; 183 } 184 /* Keep the dynamic flag of existing entry */ 185 trtmp->flags &= X509_TRUST_DYNAMIC; 186 /* Set all other flags */ 187 trtmp->flags |= flags; 188 189 trtmp->trust = id; 190 trtmp->check_trust = ck; 191 trtmp->arg1 = arg1; 192 trtmp->arg2 = arg2; 193 194 /* If its a new entry manage the dynamic table */ 195 if(idx == -1) { 196 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { 197 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 198 return 0; 199 } 200 if (!sk_X509_TRUST_push(trtable, trtmp)) { 201 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE); 202 return 0; 203 } 204 } 205 return 1; 206 } 207 208 static void trtable_free(X509_TRUST *p) 209 { 210 if(!p) return; 211 if (p->flags & X509_TRUST_DYNAMIC) 212 { 213 if (p->flags & X509_TRUST_DYNAMIC_NAME) 214 OPENSSL_free(p->name); 215 OPENSSL_free(p); 216 } 217 } 218 219 void X509_TRUST_cleanup(void) 220 { 221 int i; 222 for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i); 223 sk_X509_TRUST_pop_free(trtable, trtable_free); 224 trtable = NULL; 225 } 226 227 int X509_TRUST_get_flags(X509_TRUST *xp) 228 { 229 return xp->flags; 230 } 231 232 char *X509_TRUST_get0_name(X509_TRUST *xp) 233 { 234 return xp->name; 235 } 236 237 int X509_TRUST_get_trust(X509_TRUST *xp) 238 { 239 return xp->trust; 240 } 241 242 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 243 { 244 if(x->aux && (x->aux->trust || x->aux->reject)) 245 return obj_trust(trust->arg1, x, flags); 246 /* we don't have any trust settings: for compatibility 247 * we return trusted if it is self signed 248 */ 249 return trust_compat(trust, x, flags); 250 } 251 252 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags) 253 { 254 if(x->aux) return obj_trust(trust->arg1, x, flags); 255 return X509_TRUST_UNTRUSTED; 256 } 257 258 static int trust_compat(X509_TRUST *trust, X509 *x, int flags) 259 { 260 X509_check_purpose(x, -1, 0); 261 if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED; 262 else return X509_TRUST_UNTRUSTED; 263 } 264 265 static int obj_trust(int id, X509 *x, int flags) 266 { 267 ASN1_OBJECT *obj; 268 int i; 269 X509_CERT_AUX *ax; 270 ax = x->aux; 271 if(!ax) return X509_TRUST_UNTRUSTED; 272 if(ax->reject) { 273 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 274 obj = sk_ASN1_OBJECT_value(ax->reject, i); 275 if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED; 276 } 277 } 278 if(ax->trust) { 279 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 280 obj = sk_ASN1_OBJECT_value(ax->trust, i); 281 if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED; 282 } 283 } 284 return X509_TRUST_UNTRUSTED; 285 } 286 287