1 /* $OpenBSD: x509_trs.c,v 1.25 2021/11/01 20:53:08 tb 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 #include "x509_lcl.h" 66 67 static int tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b); 68 static void trtable_free(X509_TRUST *p); 69 70 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags); 71 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags); 72 static int trust_compat(X509_TRUST *trust, X509 *x, int flags); 73 74 static int obj_trust(int id, X509 *x, int flags); 75 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust; 76 77 /* WARNING: the following table should be kept in order of trust 78 * and without any gaps so we can just subtract the minimum trust 79 * value to get an index into the table 80 */ 81 82 static X509_TRUST trstandard[] = { 83 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL}, 84 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL}, 85 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth, NULL}, 86 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL}, 87 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL}, 88 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL}, 89 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL}, 90 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL} 91 }; 92 93 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST)) 94 95 static STACK_OF(X509_TRUST) *trtable = NULL; 96 97 static int 98 tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b) 99 { 100 return (*a)->trust - (*b)->trust; 101 } 102 103 int 104 (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int) 105 { 106 int (*oldtrust)(int , X509 *, int); 107 108 oldtrust = default_trust; 109 default_trust = trust; 110 return oldtrust; 111 } 112 113 int 114 X509_check_trust(X509 *x, int id, int flags) 115 { 116 X509_TRUST *pt; 117 int idx; 118 119 if (id == -1) 120 return 1; 121 /* 122 * XXX beck/jsing This enables self signed certs to be trusted for 123 * an unspecified id/trust flag value (this is NOT the 124 * X509_TRUST_DEFAULT), which was the longstanding 125 * openssl behaviour. boringssl does not have this behaviour. 126 * 127 * This should be revisited, but changing the default "not default" 128 * may break things. 129 */ 130 if (id == 0) { 131 int rv; 132 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0); 133 if (rv != X509_TRUST_UNTRUSTED) 134 return rv; 135 return trust_compat(NULL, x, 0); 136 } 137 idx = X509_TRUST_get_by_id(id); 138 if (idx == -1) 139 return default_trust(id, x, flags); 140 pt = X509_TRUST_get0(idx); 141 return pt->check_trust(pt, x, flags); 142 } 143 144 int 145 X509_TRUST_get_count(void) 146 { 147 if (!trtable) 148 return X509_TRUST_COUNT; 149 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT; 150 } 151 152 X509_TRUST * 153 X509_TRUST_get0(int idx) 154 { 155 if (idx < 0) 156 return NULL; 157 if (idx < (int)X509_TRUST_COUNT) 158 return trstandard + idx; 159 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT); 160 } 161 162 int 163 X509_TRUST_get_by_id(int id) 164 { 165 X509_TRUST tmp; 166 int idx; 167 168 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) 169 return id - X509_TRUST_MIN; 170 tmp.trust = id; 171 if (!trtable) 172 return -1; 173 idx = sk_X509_TRUST_find(trtable, &tmp); 174 if (idx == -1) 175 return -1; 176 return idx + X509_TRUST_COUNT; 177 } 178 179 int 180 X509_TRUST_set(int *t, int trust) 181 { 182 if (X509_TRUST_get_by_id(trust) == -1) { 183 X509error(X509_R_INVALID_TRUST); 184 return 0; 185 } 186 *t = trust; 187 return 1; 188 } 189 190 int 191 X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int), 192 const char *name, int arg1, void *arg2) 193 { 194 int idx; 195 X509_TRUST *trtmp; 196 char *name_dup; 197 198 /* This is set according to what we change: application can't set it */ 199 flags &= ~X509_TRUST_DYNAMIC; 200 /* This will always be set for application modified trust entries */ 201 flags |= X509_TRUST_DYNAMIC_NAME; 202 /* Get existing entry if any */ 203 idx = X509_TRUST_get_by_id(id); 204 /* Need a new entry */ 205 if (idx == -1) { 206 if (!(trtmp = malloc(sizeof(X509_TRUST)))) { 207 X509error(ERR_R_MALLOC_FAILURE); 208 return 0; 209 } 210 trtmp->flags = X509_TRUST_DYNAMIC; 211 } else { 212 trtmp = X509_TRUST_get0(idx); 213 if (trtmp == NULL) { 214 X509error(X509_R_INVALID_TRUST); 215 return 0; 216 } 217 } 218 219 if ((name_dup = strdup(name)) == NULL) 220 goto err; 221 222 /* free existing name if dynamic */ 223 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) 224 free(trtmp->name); 225 /* dup supplied name */ 226 trtmp->name = name_dup; 227 /* Keep the dynamic flag of existing entry */ 228 trtmp->flags &= X509_TRUST_DYNAMIC; 229 /* Set all other flags */ 230 trtmp->flags |= flags; 231 232 trtmp->trust = id; 233 trtmp->check_trust = ck; 234 trtmp->arg1 = arg1; 235 trtmp->arg2 = arg2; 236 237 /* If it's a new entry, manage the dynamic table */ 238 if (idx == -1) { 239 if (trtable == NULL && 240 (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) 241 goto err; 242 if (sk_X509_TRUST_push(trtable, trtmp) == 0) 243 goto err; 244 } 245 return 1; 246 247 err: 248 free(name_dup); 249 if (idx == -1) 250 free(trtmp); 251 X509error(ERR_R_MALLOC_FAILURE); 252 return 0; 253 } 254 255 static void 256 trtable_free(X509_TRUST *p) 257 { 258 if (!p) 259 return; 260 if (p->flags & X509_TRUST_DYNAMIC) { 261 if (p->flags & X509_TRUST_DYNAMIC_NAME) 262 free(p->name); 263 free(p); 264 } 265 } 266 267 void 268 X509_TRUST_cleanup(void) 269 { 270 sk_X509_TRUST_pop_free(trtable, trtable_free); 271 trtable = NULL; 272 } 273 274 int 275 X509_TRUST_get_flags(const X509_TRUST *xp) 276 { 277 return xp->flags; 278 } 279 280 char * 281 X509_TRUST_get0_name(const X509_TRUST *xp) 282 { 283 return xp->name; 284 } 285 286 int 287 X509_TRUST_get_trust(const X509_TRUST *xp) 288 { 289 return xp->trust; 290 } 291 292 static int 293 trust_1oidany(X509_TRUST *trust, X509 *x, int flags) 294 { 295 if (x->aux && (x->aux->trust || x->aux->reject)) 296 return obj_trust(trust->arg1, x, flags); 297 /* we don't have any trust settings: for compatibility 298 * we return trusted if it is self signed 299 */ 300 return trust_compat(trust, x, flags); 301 } 302 303 static int 304 trust_1oid(X509_TRUST *trust, X509 *x, int flags) 305 { 306 if (x->aux) 307 return obj_trust(trust->arg1, x, flags); 308 return X509_TRUST_UNTRUSTED; 309 } 310 311 static int 312 trust_compat(X509_TRUST *trust, X509 *x, int flags) 313 { 314 X509_check_purpose(x, -1, 0); 315 if (x->ex_flags & EXFLAG_SS) 316 return X509_TRUST_TRUSTED; 317 else 318 return X509_TRUST_UNTRUSTED; 319 } 320 321 static int 322 obj_trust(int id, X509 *x, int flags) 323 { 324 ASN1_OBJECT *obj; 325 int i; 326 X509_CERT_AUX *ax; 327 328 ax = x->aux; 329 if (!ax) 330 return X509_TRUST_UNTRUSTED; 331 if (ax->reject) { 332 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { 333 obj = sk_ASN1_OBJECT_value(ax->reject, i); 334 if (OBJ_obj2nid(obj) == id) 335 return X509_TRUST_REJECTED; 336 } 337 } 338 if (ax->trust) { 339 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { 340 obj = sk_ASN1_OBJECT_value(ax->trust, i); 341 if (OBJ_obj2nid(obj) == id) 342 return X509_TRUST_TRUSTED; 343 } 344 } 345 return X509_TRUST_UNTRUSTED; 346 } 347