1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 1999. */ 3 /* ==================================================================== 4 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * 3. All advertising materials mentioning features or use of this 19 * software must display the following acknowledgment: 20 * "This product includes software developed by the OpenSSL Project 21 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 22 * 23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 24 * endorse or promote products derived from this software without 25 * prior written permission. For written permission, please contact 26 * licensing (at) OpenSSL.org. 27 * 28 * 5. Products derived from this software may not be called "OpenSSL" 29 * nor may "OpenSSL" appear in their names without prior written 30 * permission of the OpenSSL Project. 31 * 32 * 6. Redistributions of any form whatsoever must retain the following 33 * acknowledgment: 34 * "This product includes software developed by the OpenSSL Project 35 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 48 * OF THE POSSIBILITY OF SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This product includes cryptographic software written by Eric Young 52 * (eay (at) cryptsoft.com). This product includes software written by Tim 53 * Hudson (tjh (at) cryptsoft.com). */ 54 55 #include <openssl/buf.h> 56 #include <openssl/err.h> 57 #include <openssl/mem.h> 58 #include <openssl/obj.h> 59 #include <openssl/x509v3.h> 60 61 62 static int tr_cmp(const X509_TRUST **a, 63 const X509_TRUST **b); 64 static void trtable_free(X509_TRUST *p); 65 66 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags); 67 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags); 68 static int trust_compat(X509_TRUST *trust, X509 *x, int flags); 69 70 static int obj_trust(int id, X509 *x, int flags); 71 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust; 72 73 /* WARNING: the following table should be kept in order of trust 74 * and without any gaps so we can just subtract the minimum trust 75 * value to get an index into the table 76 */ 77 78 static X509_TRUST trstandard[] = { 79 {X509_TRUST_COMPAT, 0, trust_compat, (char *) "compatible", 0, NULL}, 80 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, (char *) "SSL Client", NID_client_auth, NULL}, 81 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, (char *) "SSL Server", NID_server_auth, NULL}, 82 {X509_TRUST_EMAIL, 0, trust_1oidany, (char *) "S/MIME email", NID_email_protect, NULL}, 83 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, (char *) "Object Signer", NID_code_sign, NULL}, 84 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, (char *) "OCSP responder", NID_OCSP_sign, NULL}, 85 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, (char *) "OCSP request", NID_ad_OCSP, NULL}, 86 {X509_TRUST_TSA, 0, trust_1oidany, (char *) "TSA server", NID_time_stamp, NULL} 87 }; 88 89 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 90 91 static STACK_OF(X509_TRUST) *trtable = NULL; 92 93 static int tr_cmp(const X509_TRUST **a, 94 const X509_TRUST **b) 95 { 96 return (*a)->trust - (*b)->trust; 97 } 98 99 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 100 { 101 int (*oldtrust)(int , X509 *, int); 102 oldtrust = default_trust; 103 default_trust = trust; 104 return oldtrust; 105 } 106 107 108 int X509_check_trust(X509 *x, int id, int flags) 109 { 110 X509_TRUST *pt; 111 int idx; 112 if(id == -1) return 1; 113 /* We get this as a default value */ 114 if (id == 0) 115 { 116 int rv; 117 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0); 118 if (rv != X509_TRUST_UNTRUSTED) 119 return rv; 120 return trust_compat(NULL, x, 0); 121 } 122 idx = X509_TRUST_get_by_id(id); 123 if(idx == -1) return default_trust(id, x, flags); 124 pt = X509_TRUST_get0(idx); 125 return pt->check_trust(pt, x, flags); 126 } 127 128 int X509_TRUST_get_count(void) 129 { 130 if(!trtable) return X509_TRUST_COUNT; 131 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 132 } 133 134 X509_TRUST * X509_TRUST_get0(int idx) 135 { 136 if(idx < 0) return NULL; 137 if(idx < (int)X509_TRUST_COUNT) return trstandard + idx; 138 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 139 } 140 141 int X509_TRUST_get_by_id(int id) 142 { 143 X509_TRUST tmp; 144 size_t idx; 145 146 if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 147 return id - X509_TRUST_MIN; 148 tmp.trust = id; 149 if(!trtable) return -1; 150 if (!sk_X509_TRUST_find(trtable, &idx, &tmp)) { 151 return -1; 152 } 153 return idx + X509_TRUST_COUNT; 154 } 155 156 int X509_TRUST_set(int *t, int trust) 157 { 158 if(X509_TRUST_get_by_id(trust) == -1) { 159 OPENSSL_PUT_ERROR(X509, X509_TRUST_set, X509_R_INVALID_TRUST); 160 return 0; 161 } 162 *t = trust; 163 return 1; 164 } 165 166 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 167 char *name, int arg1, void *arg2) 168 { 169 int idx; 170 X509_TRUST *trtmp; 171 char *name_dup; 172 173 /* This is set according to what we change: application can't set it */ 174 flags &= ~X509_TRUST_DYNAMIC; 175 /* This will always be set for application modified trust entries */ 176 flags |= X509_TRUST_DYNAMIC_NAME; 177 /* Get existing entry if any */ 178 idx = X509_TRUST_get_by_id(id); 179 /* Need a new entry */ 180 if(idx == -1) { 181 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) { 182 OPENSSL_PUT_ERROR(X509, X509_TRUST_add, ERR_R_MALLOC_FAILURE); 183 return 0; 184 } 185 trtmp->flags = X509_TRUST_DYNAMIC; 186 } else trtmp = X509_TRUST_get0(idx); 187 188 /* Duplicate the supplied name. */ 189 name_dup = BUF_strdup(name); 190 if (name_dup == NULL) { 191 OPENSSL_PUT_ERROR(X509, X509_TRUST_add, ERR_R_MALLOC_FAILURE); 192 if (idx == -1) 193 OPENSSL_free(trtmp); 194 return 0; 195 } 196 197 /* OPENSSL_free existing name if dynamic */ 198 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name); 199 trtmp->name = name_dup; 200 /* Keep the dynamic flag of existing entry */ 201 trtmp->flags &= X509_TRUST_DYNAMIC; 202 /* Set all other flags */ 203 trtmp->flags |= flags; 204 205 trtmp->trust = id; 206 trtmp->check_trust = ck; 207 trtmp->arg1 = arg1; 208 trtmp->arg2 = arg2; 209 210 /* If its a new entry manage the dynamic table */ 211 if(idx == -1) { 212 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { 213 OPENSSL_PUT_ERROR(X509, X509_TRUST_add, ERR_R_MALLOC_FAILURE); 214 trtable_free(trtmp); 215 return 0; 216 } 217 if (!sk_X509_TRUST_push(trtable, trtmp)) { 218 OPENSSL_PUT_ERROR(X509, X509_TRUST_add, ERR_R_MALLOC_FAILURE); 219 trtable_free(trtmp); 220 return 0; 221 } 222 } 223 return 1; 224 } 225 226 static void trtable_free(X509_TRUST *p) 227 { 228 if(!p) return; 229 if (p->flags & X509_TRUST_DYNAMIC) 230 { 231 if (p->flags & X509_TRUST_DYNAMIC_NAME) 232 OPENSSL_free(p->name); 233 OPENSSL_free(p); 234 } 235 } 236 237 void X509_TRUST_cleanup(void) 238 { 239 unsigned int i; 240 for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i); 241 sk_X509_TRUST_pop_free(trtable, trtable_free); 242 trtable = NULL; 243 } 244 245 int X509_TRUST_get_flags(X509_TRUST *xp) 246 { 247 return xp->flags; 248 } 249 250 char *X509_TRUST_get0_name(X509_TRUST *xp) 251 { 252 return xp->name; 253 } 254 255 int X509_TRUST_get_trust(X509_TRUST *xp) 256 { 257 return xp->trust; 258 } 259 260 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 261 { 262 if(x->aux && (x->aux->trust || x->aux->reject)) 263 return obj_trust(trust->arg1, x, flags); 264 /* we don't have any trust settings: for compatibility 265 * we return trusted if it is self signed 266 */ 267 return trust_compat(trust, x, flags); 268 } 269 270 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags) 271 { 272 if(x->aux) return obj_trust(trust->arg1, x, flags); 273 return X509_TRUST_UNTRUSTED; 274 } 275 276 static int trust_compat(X509_TRUST *trust, X509 *x, int flags) 277 { 278 X509_check_purpose(x, -1, 0); 279 if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED; 280 else return X509_TRUST_UNTRUSTED; 281 } 282 283 static int obj_trust(int id, X509 *x, int flags) 284 { 285 ASN1_OBJECT *obj; 286 size_t i; 287 X509_CERT_AUX *ax; 288 ax = x->aux; 289 if(!ax) return X509_TRUST_UNTRUSTED; 290 if(ax->reject) { 291 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 292 obj = sk_ASN1_OBJECT_value(ax->reject, i); 293 if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED; 294 } 295 } 296 if(ax->trust) { 297 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 298 obj = sk_ASN1_OBJECT_value(ax->trust, i); 299 if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED; 300 } 301 } 302 return X509_TRUST_UNTRUSTED; 303 } 304 305
