1 /* $OpenBSD: x509_lib.c,v 1.11 2023/04/16 12:05:31 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 /* X509 v3 extension utilities */ 59 60 #include <stdio.h> 61 62 #include <openssl/conf.h> 63 #include <openssl/err.h> 64 #include <openssl/x509v3.h> 65 66 #include "x509_local.h" 67 68 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL; 69 70 static int ext_cmp(const X509V3_EXT_METHOD * const *a, 71 const X509V3_EXT_METHOD * const *b); 72 static void ext_list_free(X509V3_EXT_METHOD *ext); 73 74 extern X509V3_EXT_METHOD v3_bcons, v3_nscert, v3_key_usage, v3_ext_ku; 75 extern X509V3_EXT_METHOD v3_pkey_usage_period, v3_sxnet, v3_info, v3_sinfo; 76 extern X509V3_EXT_METHOD v3_ns_ia5_list[], v3_alt[], v3_skey_id, v3_akey_id; 77 extern X509V3_EXT_METHOD v3_crl_num, v3_crl_reason, v3_crl_invdate; 78 extern X509V3_EXT_METHOD v3_delta_crl, v3_cpols, v3_crld, v3_freshest_crl; 79 extern X509V3_EXT_METHOD v3_ocsp_nonce, v3_ocsp_accresp, v3_ocsp_acutoff; 80 extern X509V3_EXT_METHOD v3_ocsp_crlid, v3_ocsp_nocheck, v3_ocsp_serviceloc; 81 extern X509V3_EXT_METHOD v3_crl_hold; 82 extern X509V3_EXT_METHOD v3_policy_mappings, v3_policy_constraints; 83 extern X509V3_EXT_METHOD v3_name_constraints, v3_inhibit_anyp, v3_idp; 84 extern const X509V3_EXT_METHOD v3_addr, v3_asid; 85 extern const X509V3_EXT_METHOD v3_ct_scts[3]; 86 87 /* 88 * This table needs to be sorted by increasing ext_nid values for OBJ_bsearch_. 89 */ 90 91 static const X509V3_EXT_METHOD *standard_exts[] = { 92 &v3_nscert, 93 &v3_ns_ia5_list[0], 94 &v3_ns_ia5_list[1], 95 &v3_ns_ia5_list[2], 96 &v3_ns_ia5_list[3], 97 &v3_ns_ia5_list[4], 98 &v3_ns_ia5_list[5], 99 &v3_ns_ia5_list[6], 100 &v3_skey_id, 101 &v3_key_usage, 102 &v3_pkey_usage_period, 103 &v3_alt[0], 104 &v3_alt[1], 105 &v3_bcons, 106 &v3_crl_num, 107 &v3_cpols, 108 &v3_akey_id, 109 &v3_crld, 110 &v3_ext_ku, 111 &v3_delta_crl, 112 &v3_crl_reason, 113 #ifndef OPENSSL_NO_OCSP 114 &v3_crl_invdate, 115 #endif 116 &v3_sxnet, 117 &v3_info, 118 #ifndef OPENSSL_NO_RFC3779 119 &v3_addr, 120 &v3_asid, 121 #endif 122 #ifndef OPENSSL_NO_OCSP 123 &v3_ocsp_nonce, 124 &v3_ocsp_crlid, 125 &v3_ocsp_accresp, 126 &v3_ocsp_nocheck, 127 &v3_ocsp_acutoff, 128 &v3_ocsp_serviceloc, 129 #endif 130 &v3_sinfo, 131 &v3_policy_constraints, 132 #ifndef OPENSSL_NO_OCSP 133 &v3_crl_hold, 134 #endif 135 &v3_name_constraints, 136 &v3_policy_mappings, 137 &v3_inhibit_anyp, 138 &v3_idp, 139 &v3_alt[2], 140 &v3_freshest_crl, 141 #ifndef OPENSSL_NO_CT 142 &v3_ct_scts[0], 143 &v3_ct_scts[1], 144 &v3_ct_scts[2], 145 #endif 146 }; 147 148 #define STANDARD_EXTENSION_COUNT (sizeof(standard_exts) / sizeof(standard_exts[0])) 149 150 int 151 X509V3_EXT_add(X509V3_EXT_METHOD *ext) 152 { 153 if (!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) { 154 X509V3error(ERR_R_MALLOC_FAILURE); 155 return 0; 156 } 157 if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) { 158 X509V3error(ERR_R_MALLOC_FAILURE); 159 return 0; 160 } 161 return 1; 162 } 163 LCRYPTO_ALIAS(X509V3_EXT_add); 164 165 static int 166 ext_cmp(const X509V3_EXT_METHOD * const *a, const X509V3_EXT_METHOD * const *b) 167 { 168 return ((*a)->ext_nid - (*b)->ext_nid); 169 } 170 171 static int 172 ext_cmp_BSEARCH_CMP_FN(const void *a_, const void *b_) 173 { 174 const X509V3_EXT_METHOD * const *a = a_; 175 const X509V3_EXT_METHOD * const *b = b_; 176 return ext_cmp(a, b); 177 } 178 179 static const X509V3_EXT_METHOD ** 180 OBJ_bsearch_ext(const X509V3_EXT_METHOD **key, 181 const X509V3_EXT_METHOD *const *base, int num) 182 { 183 return (const X509V3_EXT_METHOD **)OBJ_bsearch_(key, base, num, 184 sizeof(const X509V3_EXT_METHOD *), ext_cmp_BSEARCH_CMP_FN); 185 } 186 187 const X509V3_EXT_METHOD * 188 X509V3_EXT_get_nid(int nid) 189 { 190 X509V3_EXT_METHOD tmp; 191 const X509V3_EXT_METHOD *t = &tmp, * const *ret; 192 int idx; 193 194 if (nid < 0) 195 return NULL; 196 tmp.ext_nid = nid; 197 ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT); 198 if (ret) 199 return *ret; 200 if (!ext_list) 201 return NULL; 202 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); 203 if (idx == -1) 204 return NULL; 205 return sk_X509V3_EXT_METHOD_value(ext_list, idx); 206 } 207 LCRYPTO_ALIAS(X509V3_EXT_get_nid); 208 209 const X509V3_EXT_METHOD * 210 X509V3_EXT_get(X509_EXTENSION *ext) 211 { 212 int nid; 213 214 if ((nid = OBJ_obj2nid(ext->object)) == NID_undef) 215 return NULL; 216 return X509V3_EXT_get_nid(nid); 217 } 218 LCRYPTO_ALIAS(X509V3_EXT_get); 219 220 int 221 X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) 222 { 223 for (; extlist->ext_nid!=-1; extlist++) 224 if (!X509V3_EXT_add(extlist)) 225 return 0; 226 return 1; 227 } 228 LCRYPTO_ALIAS(X509V3_EXT_add_list); 229 230 int 231 X509V3_EXT_add_alias(int nid_to, int nid_from) 232 { 233 const X509V3_EXT_METHOD *ext; 234 X509V3_EXT_METHOD *tmpext; 235 236 if (!(ext = X509V3_EXT_get_nid(nid_from))) { 237 X509V3error(X509V3_R_EXTENSION_NOT_FOUND); 238 return 0; 239 } 240 if (!(tmpext = malloc(sizeof(X509V3_EXT_METHOD)))) { 241 X509V3error(ERR_R_MALLOC_FAILURE); 242 return 0; 243 } 244 *tmpext = *ext; 245 tmpext->ext_nid = nid_to; 246 tmpext->ext_flags |= X509V3_EXT_DYNAMIC; 247 if (!X509V3_EXT_add(tmpext)) { 248 free(tmpext); 249 return 0; 250 } 251 return 1; 252 } 253 LCRYPTO_ALIAS(X509V3_EXT_add_alias); 254 255 void 256 X509V3_EXT_cleanup(void) 257 { 258 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); 259 ext_list = NULL; 260 } 261 LCRYPTO_ALIAS(X509V3_EXT_cleanup); 262 263 static void 264 ext_list_free(X509V3_EXT_METHOD *ext) 265 { 266 if (ext->ext_flags & X509V3_EXT_DYNAMIC) 267 free(ext); 268 } 269 270 int 271 X509V3_add_standard_extensions(void) 272 { 273 return 1; 274 } 275 LCRYPTO_ALIAS(X509V3_add_standard_extensions); 276 277 /* Return an extension internal structure */ 278 279 void * 280 X509V3_EXT_d2i(X509_EXTENSION *ext) 281 { 282 const X509V3_EXT_METHOD *method; 283 const unsigned char *p; 284 285 if (!(method = X509V3_EXT_get(ext))) 286 return NULL; 287 p = ext->value->data; 288 if (method->it) 289 return ASN1_item_d2i(NULL, &p, ext->value->length, 290 method->it); 291 return method->d2i(NULL, &p, ext->value->length); 292 } 293 LCRYPTO_ALIAS(X509V3_EXT_d2i); 294 295 /* Get critical flag and decoded version of extension from a NID. 296 * The "idx" variable returns the last found extension and can 297 * be used to retrieve multiple extensions of the same NID. 298 * However multiple extensions with the same NID is usually 299 * due to a badly encoded certificate so if idx is NULL we 300 * choke if multiple extensions exist. 301 * The "crit" variable is set to the critical value. 302 * The return value is the decoded extension or NULL on 303 * error. The actual error can have several different causes, 304 * the value of *crit reflects the cause: 305 * >= 0, extension found but not decoded (reflects critical value). 306 * -1 extension not found. 307 * -2 extension occurs more than once. 308 */ 309 310 void * 311 X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx) 312 { 313 int lastpos, i; 314 X509_EXTENSION *ex, *found_ex = NULL; 315 316 if (!x) { 317 if (idx) 318 *idx = -1; 319 if (crit) 320 *crit = -1; 321 return NULL; 322 } 323 if (idx) 324 lastpos = *idx + 1; 325 else 326 lastpos = 0; 327 if (lastpos < 0) 328 lastpos = 0; 329 for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) { 330 ex = sk_X509_EXTENSION_value(x, i); 331 if (OBJ_obj2nid(ex->object) == nid) { 332 if (idx) { 333 *idx = i; 334 found_ex = ex; 335 break; 336 } else if (found_ex) { 337 /* Found more than one */ 338 if (crit) 339 *crit = -2; 340 return NULL; 341 } 342 found_ex = ex; 343 } 344 } 345 if (found_ex) { 346 /* Found it */ 347 if (crit) 348 *crit = X509_EXTENSION_get_critical(found_ex); 349 return X509V3_EXT_d2i(found_ex); 350 } 351 352 /* Extension not found */ 353 if (idx) 354 *idx = -1; 355 if (crit) 356 *crit = -1; 357 return NULL; 358 } 359 LCRYPTO_ALIAS(X509V3_get_d2i); 360 361 /* This function is a general extension append, replace and delete utility. 362 * The precise operation is governed by the 'flags' value. The 'crit' and 363 * 'value' arguments (if relevant) are the extensions internal structure. 364 */ 365 366 int 367 X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, 368 int crit, unsigned long flags) 369 { 370 int extidx = -1; 371 int errcode; 372 X509_EXTENSION *ext, *extmp; 373 unsigned long ext_op = flags & X509V3_ADD_OP_MASK; 374 375 /* If appending we don't care if it exists, otherwise 376 * look for existing extension. 377 */ 378 if (ext_op != X509V3_ADD_APPEND) 379 extidx = X509v3_get_ext_by_NID(*x, nid, -1); 380 381 /* See if extension exists */ 382 if (extidx >= 0) { 383 /* If keep existing, nothing to do */ 384 if (ext_op == X509V3_ADD_KEEP_EXISTING) 385 return 1; 386 /* If default then its an error */ 387 if (ext_op == X509V3_ADD_DEFAULT) { 388 errcode = X509V3_R_EXTENSION_EXISTS; 389 goto err; 390 } 391 /* If delete, just delete it */ 392 if (ext_op == X509V3_ADD_DELETE) { 393 if ((extmp = sk_X509_EXTENSION_delete(*x, extidx)) == NULL) 394 return -1; 395 X509_EXTENSION_free(extmp); 396 return 1; 397 } 398 } else { 399 /* If replace existing or delete, error since 400 * extension must exist 401 */ 402 if ((ext_op == X509V3_ADD_REPLACE_EXISTING) || 403 (ext_op == X509V3_ADD_DELETE)) { 404 errcode = X509V3_R_EXTENSION_NOT_FOUND; 405 goto err; 406 } 407 } 408 409 /* If we get this far then we have to create an extension: 410 * could have some flags for alternative encoding schemes... 411 */ 412 413 ext = X509V3_EXT_i2d(nid, crit, value); 414 415 if (!ext) { 416 X509V3error(X509V3_R_ERROR_CREATING_EXTENSION); 417 return 0; 418 } 419 420 /* If extension exists replace it.. */ 421 if (extidx >= 0) { 422 extmp = sk_X509_EXTENSION_value(*x, extidx); 423 X509_EXTENSION_free(extmp); 424 if (!sk_X509_EXTENSION_set(*x, extidx, ext)) 425 return -1; 426 return 1; 427 } 428 429 if (!*x && !(*x = sk_X509_EXTENSION_new_null())) 430 return -1; 431 if (!sk_X509_EXTENSION_push(*x, ext)) 432 return -1; 433 434 return 1; 435 436 err: 437 if (!(flags & X509V3_ADD_SILENT)) 438 X509V3error(errcode); 439 return 0; 440 } 441 LCRYPTO_ALIAS(X509V3_add1_i2d); 442