1 /* $OpenBSD: x509_lib.c,v 1.1 2020/06/04 15:19:31 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 /* 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 "ext_dat.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 int 75 X509V3_EXT_add(X509V3_EXT_METHOD *ext) 76 { 77 if (!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) { 78 X509V3error(ERR_R_MALLOC_FAILURE); 79 return 0; 80 } 81 if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) { 82 X509V3error(ERR_R_MALLOC_FAILURE); 83 return 0; 84 } 85 return 1; 86 } 87 88 static int 89 ext_cmp(const X509V3_EXT_METHOD * const *a, const X509V3_EXT_METHOD * const *b) 90 { 91 return ((*a)->ext_nid - (*b)->ext_nid); 92 } 93 94 static int ext_cmp_BSEARCH_CMP_FN(const void *, const void *); 95 static int ext_cmp(const X509V3_EXT_METHOD * const *, const X509V3_EXT_METHOD * const *); 96 static const X509V3_EXT_METHOD * *OBJ_bsearch_ext(const X509V3_EXT_METHOD * *key, const X509V3_EXT_METHOD * const *base, int num); 97 98 static int 99 ext_cmp_BSEARCH_CMP_FN(const void *a_, const void *b_) 100 { 101 const X509V3_EXT_METHOD * const *a = a_; 102 const X509V3_EXT_METHOD * const *b = b_; 103 return ext_cmp(a, b); 104 } 105 106 static const X509V3_EXT_METHOD ** 107 OBJ_bsearch_ext(const X509V3_EXT_METHOD **key, 108 const X509V3_EXT_METHOD *const *base, int num) 109 { 110 return (const X509V3_EXT_METHOD **)OBJ_bsearch_(key, base, num, 111 sizeof(const X509V3_EXT_METHOD *), ext_cmp_BSEARCH_CMP_FN); 112 } 113 114 const X509V3_EXT_METHOD * 115 X509V3_EXT_get_nid(int nid) 116 { 117 X509V3_EXT_METHOD tmp; 118 const X509V3_EXT_METHOD *t = &tmp, * const *ret; 119 int idx; 120 121 if (nid < 0) 122 return NULL; 123 tmp.ext_nid = nid; 124 ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT); 125 if (ret) 126 return *ret; 127 if (!ext_list) 128 return NULL; 129 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); 130 if (idx == -1) 131 return NULL; 132 return sk_X509V3_EXT_METHOD_value(ext_list, idx); 133 } 134 135 const X509V3_EXT_METHOD * 136 X509V3_EXT_get(X509_EXTENSION *ext) 137 { 138 int nid; 139 140 if ((nid = OBJ_obj2nid(ext->object)) == NID_undef) 141 return NULL; 142 return X509V3_EXT_get_nid(nid); 143 } 144 145 int 146 X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) 147 { 148 for (; extlist->ext_nid!=-1; extlist++) 149 if (!X509V3_EXT_add(extlist)) 150 return 0; 151 return 1; 152 } 153 154 int 155 X509V3_EXT_add_alias(int nid_to, int nid_from) 156 { 157 const X509V3_EXT_METHOD *ext; 158 X509V3_EXT_METHOD *tmpext; 159 160 if (!(ext = X509V3_EXT_get_nid(nid_from))) { 161 X509V3error(X509V3_R_EXTENSION_NOT_FOUND); 162 return 0; 163 } 164 if (!(tmpext = malloc(sizeof(X509V3_EXT_METHOD)))) { 165 X509V3error(ERR_R_MALLOC_FAILURE); 166 return 0; 167 } 168 *tmpext = *ext; 169 tmpext->ext_nid = nid_to; 170 tmpext->ext_flags |= X509V3_EXT_DYNAMIC; 171 return X509V3_EXT_add(tmpext); 172 } 173 174 void 175 X509V3_EXT_cleanup(void) 176 { 177 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); 178 ext_list = NULL; 179 } 180 181 static void 182 ext_list_free(X509V3_EXT_METHOD *ext) 183 { 184 if (ext->ext_flags & X509V3_EXT_DYNAMIC) 185 free(ext); 186 } 187 188 /* Legacy function: we don't need to add standard extensions 189 * any more because they are now kept in ext_dat.h. 190 */ 191 192 int 193 X509V3_add_standard_extensions(void) 194 { 195 return 1; 196 } 197 198 /* Return an extension internal structure */ 199 200 void * 201 X509V3_EXT_d2i(X509_EXTENSION *ext) 202 { 203 const X509V3_EXT_METHOD *method; 204 const unsigned char *p; 205 206 if (!(method = X509V3_EXT_get(ext))) 207 return NULL; 208 p = ext->value->data; 209 if (method->it) 210 return ASN1_item_d2i(NULL, &p, ext->value->length, 211 method->it); 212 return method->d2i(NULL, &p, ext->value->length); 213 } 214 215 /* Get critical flag and decoded version of extension from a NID. 216 * The "idx" variable returns the last found extension and can 217 * be used to retrieve multiple extensions of the same NID. 218 * However multiple extensions with the same NID is usually 219 * due to a badly encoded certificate so if idx is NULL we 220 * choke if multiple extensions exist. 221 * The "crit" variable is set to the critical value. 222 * The return value is the decoded extension or NULL on 223 * error. The actual error can have several different causes, 224 * the value of *crit reflects the cause: 225 * >= 0, extension found but not decoded (reflects critical value). 226 * -1 extension not found. 227 * -2 extension occurs more than once. 228 */ 229 230 void * 231 X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx) 232 { 233 int lastpos, i; 234 X509_EXTENSION *ex, *found_ex = NULL; 235 236 if (!x) { 237 if (idx) 238 *idx = -1; 239 if (crit) 240 *crit = -1; 241 return NULL; 242 } 243 if (idx) 244 lastpos = *idx + 1; 245 else 246 lastpos = 0; 247 if (lastpos < 0) 248 lastpos = 0; 249 for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) { 250 ex = sk_X509_EXTENSION_value(x, i); 251 if (OBJ_obj2nid(ex->object) == nid) { 252 if (idx) { 253 *idx = i; 254 found_ex = ex; 255 break; 256 } else if (found_ex) { 257 /* Found more than one */ 258 if (crit) 259 *crit = -2; 260 return NULL; 261 } 262 found_ex = ex; 263 } 264 } 265 if (found_ex) { 266 /* Found it */ 267 if (crit) 268 *crit = X509_EXTENSION_get_critical(found_ex); 269 return X509V3_EXT_d2i(found_ex); 270 } 271 272 /* Extension not found */ 273 if (idx) 274 *idx = -1; 275 if (crit) 276 *crit = -1; 277 return NULL; 278 } 279 280 /* This function is a general extension append, replace and delete utility. 281 * The precise operation is governed by the 'flags' value. The 'crit' and 282 * 'value' arguments (if relevant) are the extensions internal structure. 283 */ 284 285 int 286 X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, 287 int crit, unsigned long flags) 288 { 289 int extidx = -1; 290 int errcode; 291 X509_EXTENSION *ext, *extmp; 292 unsigned long ext_op = flags & X509V3_ADD_OP_MASK; 293 294 /* If appending we don't care if it exists, otherwise 295 * look for existing extension. 296 */ 297 if (ext_op != X509V3_ADD_APPEND) 298 extidx = X509v3_get_ext_by_NID(*x, nid, -1); 299 300 /* See if extension exists */ 301 if (extidx >= 0) { 302 /* If keep existing, nothing to do */ 303 if (ext_op == X509V3_ADD_KEEP_EXISTING) 304 return 1; 305 /* If default then its an error */ 306 if (ext_op == X509V3_ADD_DEFAULT) { 307 errcode = X509V3_R_EXTENSION_EXISTS; 308 goto err; 309 } 310 /* If delete, just delete it */ 311 if (ext_op == X509V3_ADD_DELETE) { 312 if (!sk_X509_EXTENSION_delete(*x, extidx)) 313 return -1; 314 return 1; 315 } 316 } else { 317 /* If replace existing or delete, error since 318 * extension must exist 319 */ 320 if ((ext_op == X509V3_ADD_REPLACE_EXISTING) || 321 (ext_op == X509V3_ADD_DELETE)) { 322 errcode = X509V3_R_EXTENSION_NOT_FOUND; 323 goto err; 324 } 325 } 326 327 /* If we get this far then we have to create an extension: 328 * could have some flags for alternative encoding schemes... 329 */ 330 331 ext = X509V3_EXT_i2d(nid, crit, value); 332 333 if (!ext) { 334 X509V3error(X509V3_R_ERROR_CREATING_EXTENSION); 335 return 0; 336 } 337 338 /* If extension exists replace it.. */ 339 if (extidx >= 0) { 340 extmp = sk_X509_EXTENSION_value(*x, extidx); 341 X509_EXTENSION_free(extmp); 342 if (!sk_X509_EXTENSION_set(*x, extidx, ext)) 343 return -1; 344 return 1; 345 } 346 347 if (!*x && !(*x = sk_X509_EXTENSION_new_null())) 348 return -1; 349 if (!sk_X509_EXTENSION_push(*x, ext)) 350 return -1; 351 352 return 1; 353 354 err: 355 if (!(flags & X509V3_ADD_SILENT)) 356 X509V3error(errcode); 357 return 0; 358 } 359