1 /* $OpenBSD: x509_trs.c,v 1.15 2014/07/11 08:44:49 jsing 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 61 #include <openssl/err.h> 62 #include <openssl/x509v3.h> 63 64 static int tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b); 65 static void trtable_free(X509_TRUST *p); 66 67 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags); 68 static int trust_1oid(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 Server", NID_server_auth, NULL}, 83 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL}, 84 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, 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 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL} 88 }; 89 90 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 91 92 IMPLEMENT_STACK_OF(X509_TRUST) 93 94 static STACK_OF(X509_TRUST) *trtable = NULL; 95 96 static int 97 tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b) 98 { 99 return (*a)->trust - (*b)->trust; 100 } 101 102 int 103 (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 104 { 105 int (*oldtrust)(int , X509 *, int); 106 107 oldtrust = default_trust; 108 default_trust = trust; 109 return oldtrust; 110 } 111 112 int 113 X509_check_trust(X509 *x, int id, int flags) 114 { 115 X509_TRUST *pt; 116 int idx; 117 118 if (id == -1) 119 return 1; 120 idx = X509_TRUST_get_by_id(id); 121 if (idx == -1) 122 return default_trust(id, x, flags); 123 pt = X509_TRUST_get0(idx); 124 return pt->check_trust(pt, x, flags); 125 } 126 127 int 128 X509_TRUST_get_count(void) 129 { 130 if (!trtable) 131 return X509_TRUST_COUNT; 132 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 133 } 134 135 X509_TRUST * 136 X509_TRUST_get0(int idx) 137 { 138 if (idx < 0) 139 return NULL; 140 if (idx < (int)X509_TRUST_COUNT) 141 return trstandard + idx; 142 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 143 } 144 145 int 146 X509_TRUST_get_by_id(int id) 147 { 148 X509_TRUST tmp; 149 int idx; 150 151 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 152 return id - X509_TRUST_MIN; 153 tmp.trust = id; 154 if (!trtable) 155 return -1; 156 idx = sk_X509_TRUST_find(trtable, &tmp); 157 if (idx == -1) 158 return -1; 159 return idx + X509_TRUST_COUNT; 160 } 161 162 int 163 X509_TRUST_set(int *t, int trust) 164 { 165 if (X509_TRUST_get_by_id(trust) == -1) { 166 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST); 167 return 0; 168 } 169 *t = trust; 170 return 1; 171 } 172 173 int 174 X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 175 char *name, int arg1, void *arg2) 176 { 177 int idx; 178 X509_TRUST *trtmp; 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); 195 196 /* free existing name if dynamic */ 197 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) 198 free(trtmp->name); 199 /* dup supplied name */ 200 if (!(trtmp->name = BUF_strdup(name))) { 201 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); 202 return 0; 203 } 204 /* Keep the dynamic flag of existing entry */ 205 trtmp->flags &= X509_TRUST_DYNAMIC; 206 /* Set all other flags */ 207 trtmp->flags |= flags; 208 209 trtmp->trust = id; 210 trtmp->check_trust = ck; 211 trtmp->arg1 = arg1; 212 trtmp->arg2 = arg2; 213 214 /* If its a new entry manage the dynamic table */ 215 if (idx == -1) { 216 if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { 217 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); 218 return 0; 219 } 220 if (!sk_X509_TRUST_push(trtable, trtmp)) { 221 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); 222 return 0; 223 } 224 } 225 return 1; 226 } 227 228 static void 229 trtable_free(X509_TRUST *p) 230 { 231 if (!p) 232 return; 233 if (p->flags & X509_TRUST_DYNAMIC) { 234 if (p->flags & X509_TRUST_DYNAMIC_NAME) 235 free(p->name); 236 free(p); 237 } 238 } 239 240 void 241 X509_TRUST_cleanup(void) 242 { 243 unsigned int i; 244 245 for (i = 0; i < X509_TRUST_COUNT; i++) 246 trtable_free(trstandard + i); 247 sk_X509_TRUST_pop_free(trtable, trtable_free); 248 trtable = NULL; 249 } 250 251 int 252 X509_TRUST_get_flags(X509_TRUST *xp) 253 { 254 return xp->flags; 255 } 256 257 char * 258 X509_TRUST_get0_name(X509_TRUST *xp) 259 { 260 return xp->name; 261 } 262 263 int 264 X509_TRUST_get_trust(X509_TRUST *xp) 265 { 266 return xp->trust; 267 } 268 269 static int 270 trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 271 { 272 if (x->aux && (x->aux->trust || x->aux->reject)) 273 return obj_trust(trust->arg1, x, flags); 274 /* we don't have any trust settings: for compatibility 275 * we return trusted if it is self signed 276 */ 277 return trust_compat(trust, x, flags); 278 } 279 280 static int 281 trust_1oid(X509_TRUST *trust, X509 *x, int flags) 282 { 283 if (x->aux) 284 return obj_trust(trust->arg1, x, flags); 285 return X509_TRUST_UNTRUSTED; 286 } 287 288 static int 289 trust_compat(X509_TRUST *trust, X509 *x, int flags) 290 { 291 X509_check_purpose(x, -1, 0); 292 if (x->ex_flags & EXFLAG_SS) 293 return X509_TRUST_TRUSTED; 294 else 295 return X509_TRUST_UNTRUSTED; 296 } 297 298 static int 299 obj_trust(int id, X509 *x, int flags) 300 { 301 ASN1_OBJECT *obj; 302 int i; 303 X509_CERT_AUX *ax; 304 305 ax = x->aux; 306 if (!ax) 307 return X509_TRUST_UNTRUSTED; 308 if (ax->reject) { 309 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 310 obj = sk_ASN1_OBJECT_value(ax->reject, i); 311 if (OBJ_obj2nid(obj) == id) 312 return X509_TRUST_REJECTED; 313 } 314 } 315 if (ax->trust) { 316 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 317 obj = sk_ASN1_OBJECT_value(ax->trust, i); 318 if (OBJ_obj2nid(obj) == id) 319 return X509_TRUST_TRUSTED; 320 } 321 } 322 return X509_TRUST_UNTRUSTED; 323 } 324