1 /* 2 * Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL project 3 * 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). */ 56 57 #include <openssl/buf.h> 58 #include <openssl/err.h> 59 #include <openssl/mem.h> 60 #include <openssl/obj.h> 61 #include <openssl/x509v3.h> 62 63 static int tr_cmp(const X509_TRUST **a, 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 /* 74 * WARNING: the following table should be kept in order of trust and without 75 * any gaps so we can just subtract the minimum trust value to get an index 76 * into the table 77 */ 78 79 static X509_TRUST trstandard[] = { 80 {X509_TRUST_COMPAT, 0, trust_compat, (char *)"compatible", 0, NULL}, 81 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, (char *)"SSL Client", 82 NID_client_auth, NULL}, 83 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, (char *)"SSL Server", 84 NID_server_auth, NULL}, 85 {X509_TRUST_EMAIL, 0, trust_1oidany, (char *)"S/MIME email", 86 NID_email_protect, NULL}, 87 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, (char *)"Object Signer", 88 NID_code_sign, NULL}, 89 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, (char *)"OCSP responder", 90 NID_OCSP_sign, NULL}, 91 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, (char *)"OCSP request", 92 NID_ad_OCSP, NULL}, 93 {X509_TRUST_TSA, 0, trust_1oidany, (char *)"TSA server", NID_time_stamp, 94 NULL} 95 }; 96 97 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 98 99 static STACK_OF(X509_TRUST) *trtable = NULL; 100 101 static int tr_cmp(const X509_TRUST **a, const X509_TRUST **b) 102 { 103 return (*a)->trust - (*b)->trust; 104 } 105 106 int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *, 107 int) { 108 int (*oldtrust) (int, X509 *, int); 109 oldtrust = default_trust; 110 default_trust = trust; 111 return oldtrust; 112 } 113 114 int X509_check_trust(X509 *x, int id, int flags) 115 { 116 X509_TRUST *pt; 117 int idx; 118 if (id == -1) 119 return 1; 120 /* We get this as a default value */ 121 if (id == 0) { 122 int rv; 123 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0); 124 if (rv != X509_TRUST_UNTRUSTED) 125 return rv; 126 return trust_compat(NULL, x, 0); 127 } 128 idx = X509_TRUST_get_by_id(id); 129 if (idx == -1) 130 return default_trust(id, x, flags); 131 pt = X509_TRUST_get0(idx); 132 return pt->check_trust(pt, x, flags); 133 } 134 135 int X509_TRUST_get_count(void) 136 { 137 if (!trtable) 138 return X509_TRUST_COUNT; 139 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 140 } 141 142 X509_TRUST *X509_TRUST_get0(int idx) 143 { 144 if (idx < 0) 145 return NULL; 146 if (idx < (int)X509_TRUST_COUNT) 147 return trstandard + idx; 148 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 149 } 150 151 int X509_TRUST_get_by_id(int id) 152 { 153 X509_TRUST tmp; 154 size_t idx; 155 156 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 157 return id - X509_TRUST_MIN; 158 tmp.trust = id; 159 if (!trtable) 160 return -1; 161 if (!sk_X509_TRUST_find(trtable, &idx, &tmp)) { 162 return -1; 163 } 164 return idx + X509_TRUST_COUNT; 165 } 166 167 int X509_TRUST_set(int *t, int trust) 168 { 169 if (X509_TRUST_get_by_id(trust) == -1) { 170 OPENSSL_PUT_ERROR(X509, X509_R_INVALID_TRUST); 171 return 0; 172 } 173 *t = trust; 174 return 1; 175 } 176 177 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int), 178 char *name, int arg1, void *arg2) 179 { 180 int idx; 181 X509_TRUST *trtmp; 182 char *name_dup; 183 184 /* 185 * This is set according to what we change: application can't set it 186 */ 187 flags &= ~X509_TRUST_DYNAMIC; 188 /* This will always be set for application modified trust entries */ 189 flags |= X509_TRUST_DYNAMIC_NAME; 190 /* Get existing entry if any */ 191 idx = X509_TRUST_get_by_id(id); 192 /* Need a new entry */ 193 if (idx == -1) { 194 if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) { 195 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 196 return 0; 197 } 198 trtmp->flags = X509_TRUST_DYNAMIC; 199 } else 200 trtmp = X509_TRUST_get0(idx); 201 202 /* Duplicate the supplied name. */ 203 name_dup = BUF_strdup(name); 204 if (name_dup == NULL) { 205 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 206 if (idx == -1) 207 OPENSSL_free(trtmp); 208 return 0; 209 } 210 211 /* OPENSSL_free existing name if dynamic */ 212 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) 213 OPENSSL_free(trtmp->name); 214 trtmp->name = name_dup; 215 /* Keep the dynamic flag of existing entry */ 216 trtmp->flags &= X509_TRUST_DYNAMIC; 217 /* Set all other flags */ 218 trtmp->flags |= flags; 219 220 trtmp->trust = id; 221 trtmp->check_trust = ck; 222 trtmp->arg1 = arg1; 223 trtmp->arg2 = arg2; 224 225 /* If its a new entry manage the dynamic table */ 226 if (idx == -1) { 227 if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { 228 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 229 trtable_free(trtmp); 230 return 0; 231 } 232 if (!sk_X509_TRUST_push(trtable, trtmp)) { 233 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 234 trtable_free(trtmp); 235 return 0; 236 } 237 } 238 return 1; 239 } 240 241 static void trtable_free(X509_TRUST *p) 242 { 243 if (!p) 244 return; 245 if (p->flags & X509_TRUST_DYNAMIC) { 246 if (p->flags & X509_TRUST_DYNAMIC_NAME) 247 OPENSSL_free(p->name); 248 OPENSSL_free(p); 249 } 250 } 251 252 void X509_TRUST_cleanup(void) 253 { 254 unsigned int i; 255 for (i = 0; i < X509_TRUST_COUNT; i++) 256 trtable_free(trstandard + i); 257 sk_X509_TRUST_pop_free(trtable, trtable_free); 258 trtable = NULL; 259 } 260 261 int X509_TRUST_get_flags(X509_TRUST *xp) 262 { 263 return xp->flags; 264 } 265 266 char *X509_TRUST_get0_name(X509_TRUST *xp) 267 { 268 return xp->name; 269 } 270 271 int X509_TRUST_get_trust(X509_TRUST *xp) 272 { 273 return xp->trust; 274 } 275 276 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 277 { 278 if (x->aux && (x->aux->trust || x->aux->reject)) 279 return obj_trust(trust->arg1, x, flags); 280 /* 281 * we don't have any trust settings: for compatibility we return trusted 282 * if it is self signed 283 */ 284 return trust_compat(trust, x, flags); 285 } 286 287 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags) 288 { 289 if (x->aux) 290 return obj_trust(trust->arg1, x, flags); 291 return X509_TRUST_UNTRUSTED; 292 } 293 294 static int trust_compat(X509_TRUST *trust, X509 *x, int flags) 295 { 296 X509_check_purpose(x, -1, 0); 297 if (x->ex_flags & EXFLAG_SS) 298 return X509_TRUST_TRUSTED; 299 else 300 return X509_TRUST_UNTRUSTED; 301 } 302 303 static int obj_trust(int id, X509 *x, int flags) 304 { 305 ASN1_OBJECT *obj; 306 size_t i; 307 X509_CERT_AUX *ax; 308 ax = x->aux; 309 if (!ax) 310 return X509_TRUST_UNTRUSTED; 311 if (ax->reject) { 312 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 313 obj = sk_ASN1_OBJECT_value(ax->reject, i); 314 if (OBJ_obj2nid(obj) == id) 315 return X509_TRUST_REJECTED; 316 } 317 } 318 if (ax->trust) { 319 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 320 obj = sk_ASN1_OBJECT_value(ax->trust, i); 321 if (OBJ_obj2nid(obj) == id) 322 return X509_TRUST_TRUSTED; 323 } 324 } 325 return X509_TRUST_UNTRUSTED; 326 } 327
