1 /* $OpenBSD: x509_trs.c,v 1.19 2014/12/06 19:26:37 doug 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 #include <string.h> 61 62 #include <openssl/err.h> 63 #include <openssl/x509v3.h> 64 65 static int tr_cmp(const X509_TRUST * const *a, 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_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL}, 86 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL}, 87 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL}, 88 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL} 89 }; 90 91 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 92 93 static STACK_OF(X509_TRUST) *trtable = NULL; 94 95 static int 96 tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b) 97 { 98 return (*a)->trust - (*b)->trust; 99 } 100 101 int 102 (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 103 { 104 int (*oldtrust)(int , X509 *, int); 105 106 oldtrust = default_trust; 107 default_trust = trust; 108 return oldtrust; 109 } 110 111 int 112 X509_check_trust(X509 *x, int id, int flags) 113 { 114 X509_TRUST *pt; 115 int idx; 116 117 if (id == -1) 118 return 1; 119 idx = X509_TRUST_get_by_id(id); 120 if (idx == -1) 121 return default_trust(id, x, flags); 122 pt = X509_TRUST_get0(idx); 123 return pt->check_trust(pt, x, flags); 124 } 125 126 int 127 X509_TRUST_get_count(void) 128 { 129 if (!trtable) 130 return X509_TRUST_COUNT; 131 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 132 } 133 134 X509_TRUST * 135 X509_TRUST_get0(int idx) 136 { 137 if (idx < 0) 138 return NULL; 139 if (idx < (int)X509_TRUST_COUNT) 140 return trstandard + idx; 141 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 142 } 143 144 int 145 X509_TRUST_get_by_id(int id) 146 { 147 X509_TRUST tmp; 148 int idx; 149 150 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 151 return id - X509_TRUST_MIN; 152 tmp.trust = id; 153 if (!trtable) 154 return -1; 155 idx = sk_X509_TRUST_find(trtable, &tmp); 156 if (idx == -1) 157 return -1; 158 return idx + X509_TRUST_COUNT; 159 } 160 161 int 162 X509_TRUST_set(int *t, int trust) 163 { 164 if (X509_TRUST_get_by_id(trust) == -1) { 165 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST); 166 return 0; 167 } 168 *t = trust; 169 return 1; 170 } 171 172 int 173 X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 174 char *name, int arg1, void *arg2) 175 { 176 int idx; 177 X509_TRUST *trtmp; 178 char *name_dup; 179 180 /* This is set according to what we change: application can't set it */ 181 flags &= ~X509_TRUST_DYNAMIC; 182 /* This will always be set for application modified trust entries */ 183 flags |= X509_TRUST_DYNAMIC_NAME; 184 /* Get existing entry if any */ 185 idx = X509_TRUST_get_by_id(id); 186 /* Need a new entry */ 187 if (idx == -1) { 188 if (!(trtmp = malloc(sizeof(X509_TRUST)))) { 189 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); 190 return 0; 191 } 192 trtmp->flags = X509_TRUST_DYNAMIC; 193 } else { 194 trtmp = X509_TRUST_get0(idx); 195 if (trtmp == NULL) { 196 X509err(X509_F_X509_TRUST_ADD, X509_R_INVALID_TRUST); 197 return 0; 198 } 199 } 200 201 if ((name_dup = strdup(name)) == NULL) 202 goto err; 203 204 /* free existing name if dynamic */ 205 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) 206 free(trtmp->name); 207 /* dup supplied name */ 208 trtmp->name = name_dup; 209 /* Keep the dynamic flag of existing entry */ 210 trtmp->flags &= X509_TRUST_DYNAMIC; 211 /* Set all other flags */ 212 trtmp->flags |= flags; 213 214 trtmp->trust = id; 215 trtmp->check_trust = ck; 216 trtmp->arg1 = arg1; 217 trtmp->arg2 = arg2; 218 219 /* If it's a new entry, manage the dynamic table */ 220 if (idx == -1) { 221 if (trtable == NULL && 222 (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) 223 goto err; 224 if (sk_X509_TRUST_push(trtable, trtmp) == 0) 225 goto err; 226 } 227 return 1; 228 229 err: 230 free(name_dup); 231 if (idx == -1) 232 free(trtmp); 233 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); 234 return 0; 235 } 236 237 static void 238 trtable_free(X509_TRUST *p) 239 { 240 if (!p) 241 return; 242 if (p->flags & X509_TRUST_DYNAMIC) { 243 if (p->flags & X509_TRUST_DYNAMIC_NAME) 244 free(p->name); 245 free(p); 246 } 247 } 248 249 void 250 X509_TRUST_cleanup(void) 251 { 252 unsigned int i; 253 254 for (i = 0; i < X509_TRUST_COUNT; i++) 255 trtable_free(trstandard + i); 256 sk_X509_TRUST_pop_free(trtable, trtable_free); 257 trtable = NULL; 258 } 259 260 int 261 X509_TRUST_get_flags(X509_TRUST *xp) 262 { 263 return xp->flags; 264 } 265 266 char * 267 X509_TRUST_get0_name(X509_TRUST *xp) 268 { 269 return xp->name; 270 } 271 272 int 273 X509_TRUST_get_trust(X509_TRUST *xp) 274 { 275 return xp->trust; 276 } 277 278 static int 279 trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 280 { 281 if (x->aux && (x->aux->trust || x->aux->reject)) 282 return obj_trust(trust->arg1, x, flags); 283 /* we don't have any trust settings: for compatibility 284 * we return trusted if it is self signed 285 */ 286 return trust_compat(trust, x, flags); 287 } 288 289 static int 290 trust_1oid(X509_TRUST *trust, X509 *x, int flags) 291 { 292 if (x->aux) 293 return obj_trust(trust->arg1, x, flags); 294 return X509_TRUST_UNTRUSTED; 295 } 296 297 static int 298 trust_compat(X509_TRUST *trust, X509 *x, int flags) 299 { 300 X509_check_purpose(x, -1, 0); 301 if (x->ex_flags & EXFLAG_SS) 302 return X509_TRUST_TRUSTED; 303 else 304 return X509_TRUST_UNTRUSTED; 305 } 306 307 static int 308 obj_trust(int id, X509 *x, int flags) 309 { 310 ASN1_OBJECT *obj; 311 int i; 312 X509_CERT_AUX *ax; 313 314 ax = x->aux; 315 if (!ax) 316 return X509_TRUST_UNTRUSTED; 317 if (ax->reject) { 318 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 319 obj = sk_ASN1_OBJECT_value(ax->reject, i); 320 if (OBJ_obj2nid(obj) == id) 321 return X509_TRUST_REJECTED; 322 } 323 } 324 if (ax->trust) { 325 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 326 obj = sk_ASN1_OBJECT_value(ax->trust, i); 327 if (OBJ_obj2nid(obj) == id) 328 return X509_TRUST_TRUSTED; 329 } 330 } 331 return X509_TRUST_UNTRUSTED; 332 } 333