1 /* $OpenBSD: x509_trs.c,v 1.24 2021/07/23 20:50:28 schwarze 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 /* 120 * XXX beck/jsing This enables self signed certs to be trusted for 121 * an unspecified id/trust flag value (this is NOT the 122 * X509_TRUST_DEFAULT), which was the longstanding 123 * openssl behaviour. boringssl does not have this behaviour. 124 * 125 * This should be revisited, but changing the default "not default" 126 * may break things. 127 */ 128 if (id == 0) { 129 int rv; 130 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0); 131 if (rv != X509_TRUST_UNTRUSTED) 132 return rv; 133 return trust_compat(NULL, x, 0); 134 } 135 idx = X509_TRUST_get_by_id(id); 136 if (idx == -1) 137 return default_trust(id, x, flags); 138 pt = X509_TRUST_get0(idx); 139 return pt->check_trust(pt, x, flags); 140 } 141 142 int 143 X509_TRUST_get_count(void) 144 { 145 if (!trtable) 146 return X509_TRUST_COUNT; 147 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 148 } 149 150 X509_TRUST * 151 X509_TRUST_get0(int idx) 152 { 153 if (idx < 0) 154 return NULL; 155 if (idx < (int)X509_TRUST_COUNT) 156 return trstandard + idx; 157 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 158 } 159 160 int 161 X509_TRUST_get_by_id(int id) 162 { 163 X509_TRUST tmp; 164 int idx; 165 166 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 167 return id - X509_TRUST_MIN; 168 tmp.trust = id; 169 if (!trtable) 170 return -1; 171 idx = sk_X509_TRUST_find(trtable, &tmp); 172 if (idx == -1) 173 return -1; 174 return idx + X509_TRUST_COUNT; 175 } 176 177 int 178 X509_TRUST_set(int *t, int trust) 179 { 180 if (X509_TRUST_get_by_id(trust) == -1) { 181 X509error(X509_R_INVALID_TRUST); 182 return 0; 183 } 184 *t = trust; 185 return 1; 186 } 187 188 int 189 X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 190 const char *name, int arg1, void *arg2) 191 { 192 int idx; 193 X509_TRUST *trtmp; 194 char *name_dup; 195 196 /* This is set according to what we change: application can't set it */ 197 flags &= ~X509_TRUST_DYNAMIC; 198 /* This will always be set for application modified trust entries */ 199 flags |= X509_TRUST_DYNAMIC_NAME; 200 /* Get existing entry if any */ 201 idx = X509_TRUST_get_by_id(id); 202 /* Need a new entry */ 203 if (idx == -1) { 204 if (!(trtmp = malloc(sizeof(X509_TRUST)))) { 205 X509error(ERR_R_MALLOC_FAILURE); 206 return 0; 207 } 208 trtmp->flags = X509_TRUST_DYNAMIC; 209 } else { 210 trtmp = X509_TRUST_get0(idx); 211 if (trtmp == NULL) { 212 X509error(X509_R_INVALID_TRUST); 213 return 0; 214 } 215 } 216 217 if ((name_dup = strdup(name)) == NULL) 218 goto err; 219 220 /* free existing name if dynamic */ 221 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) 222 free(trtmp->name); 223 /* dup supplied name */ 224 trtmp->name = name_dup; 225 /* Keep the dynamic flag of existing entry */ 226 trtmp->flags &= X509_TRUST_DYNAMIC; 227 /* Set all other flags */ 228 trtmp->flags |= flags; 229 230 trtmp->trust = id; 231 trtmp->check_trust = ck; 232 trtmp->arg1 = arg1; 233 trtmp->arg2 = arg2; 234 235 /* If it's a new entry, manage the dynamic table */ 236 if (idx == -1) { 237 if (trtable == NULL && 238 (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) 239 goto err; 240 if (sk_X509_TRUST_push(trtable, trtmp) == 0) 241 goto err; 242 } 243 return 1; 244 245 err: 246 free(name_dup); 247 if (idx == -1) 248 free(trtmp); 249 X509error(ERR_R_MALLOC_FAILURE); 250 return 0; 251 } 252 253 static void 254 trtable_free(X509_TRUST *p) 255 { 256 if (!p) 257 return; 258 if (p->flags & X509_TRUST_DYNAMIC) { 259 if (p->flags & X509_TRUST_DYNAMIC_NAME) 260 free(p->name); 261 free(p); 262 } 263 } 264 265 void 266 X509_TRUST_cleanup(void) 267 { 268 sk_X509_TRUST_pop_free(trtable, trtable_free); 269 trtable = NULL; 270 } 271 272 int 273 X509_TRUST_get_flags(const X509_TRUST *xp) 274 { 275 return xp->flags; 276 } 277 278 char * 279 X509_TRUST_get0_name(const X509_TRUST *xp) 280 { 281 return xp->name; 282 } 283 284 int 285 X509_TRUST_get_trust(const X509_TRUST *xp) 286 { 287 return xp->trust; 288 } 289 290 static int 291 trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 292 { 293 if (x->aux && (x->aux->trust || x->aux->reject)) 294 return obj_trust(trust->arg1, x, flags); 295 /* we don't have any trust settings: for compatibility 296 * we return trusted if it is self signed 297 */ 298 return trust_compat(trust, x, flags); 299 } 300 301 static int 302 trust_1oid(X509_TRUST *trust, X509 *x, int flags) 303 { 304 if (x->aux) 305 return obj_trust(trust->arg1, x, flags); 306 return X509_TRUST_UNTRUSTED; 307 } 308 309 static int 310 trust_compat(X509_TRUST *trust, X509 *x, int flags) 311 { 312 X509_check_purpose(x, -1, 0); 313 if (x->ex_flags & EXFLAG_SS) 314 return X509_TRUST_TRUSTED; 315 else 316 return X509_TRUST_UNTRUSTED; 317 } 318 319 static int 320 obj_trust(int id, X509 *x, int flags) 321 { 322 ASN1_OBJECT *obj; 323 int i; 324 X509_CERT_AUX *ax; 325 326 ax = x->aux; 327 if (!ax) 328 return X509_TRUST_UNTRUSTED; 329 if (ax->reject) { 330 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 331 obj = sk_ASN1_OBJECT_value(ax->reject, i); 332 if (OBJ_obj2nid(obj) == id) 333 return X509_TRUST_REJECTED; 334 } 335 } 336 if (ax->trust) { 337 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 338 obj = sk_ASN1_OBJECT_value(ax->trust, i); 339 if (OBJ_obj2nid(obj) == id) 340 return X509_TRUST_TRUSTED; 341 } 342 } 343 return X509_TRUST_UNTRUSTED; 344 } 345