1/* v3_lib.c */ 2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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#include "cryptlib.h" 62#include <openssl/conf.h> 63#include <openssl/x509v3.h> 64 65#include "ext_dat.h" 66 67static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL; 68 69static int ext_cmp(const X509V3_EXT_METHOD * const *a, 70 const X509V3_EXT_METHOD * const *b); 71static void ext_list_free(X509V3_EXT_METHOD *ext); 72 73int X509V3_EXT_add(X509V3_EXT_METHOD *ext) 74{ 75 if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) { 76 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE); 77 return 0; 78 } 79 if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) { 80 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE); 81 return 0; 82 } 83 return 1; 84} 85 86static int ext_cmp(const X509V3_EXT_METHOD * const *a, 87 const X509V3_EXT_METHOD * const *b) 88{ 89 return ((*a)->ext_nid - (*b)->ext_nid); 90} 91 92X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid) 93{ 94 X509V3_EXT_METHOD tmp, *t = &tmp, **ret; 95 int idx; 96 if(nid < 0) return NULL; 97 tmp.ext_nid = nid; 98 ret = (X509V3_EXT_METHOD **) OBJ_bsearch((char *)&t, 99 (char *)standard_exts, STANDARD_EXTENSION_COUNT, 100 sizeof(X509V3_EXT_METHOD *), (int (*)(const void *, const void *))ext_cmp); 101 if(ret) return *ret; 102 if(!ext_list) return NULL; 103 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); 104 if(idx == -1) return NULL; 105 return sk_X509V3_EXT_METHOD_value(ext_list, idx); 106} 107 108X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext) 109{ 110 int nid; 111 if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL; 112 return X509V3_EXT_get_nid(nid); 113} 114 115 116int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) 117{ 118 for(;extlist->ext_nid!=-1;extlist++) 119 if(!X509V3_EXT_add(extlist)) return 0; 120 return 1; 121} 122 123int X509V3_EXT_add_alias(int nid_to, int nid_from) 124{ 125 X509V3_EXT_METHOD *ext, *tmpext; 126 if(!(ext = X509V3_EXT_get_nid(nid_from))) { 127 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND); 128 return 0; 129 } 130 if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) { 131 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE); 132 return 0; 133 } 134 *tmpext = *ext; 135 tmpext->ext_nid = nid_to; 136 tmpext->ext_flags |= X509V3_EXT_DYNAMIC; 137 return X509V3_EXT_add(tmpext); 138} 139 140void X509V3_EXT_cleanup(void) 141{ 142 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); 143 ext_list = NULL; 144} 145 146static void ext_list_free(X509V3_EXT_METHOD *ext) 147{ 148 if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext); 149} 150 151/* Legacy function: we don't need to add standard extensions 152 * any more because they are now kept in ext_dat.h. 153 */ 154 155int X509V3_add_standard_extensions(void) 156{ 157 return 1; 158} 159 160/* Return an extension internal structure */ 161 162void *X509V3_EXT_d2i(X509_EXTENSION *ext) 163{ 164 X509V3_EXT_METHOD *method; 165 const unsigned char *p; 166 167 if(!(method = X509V3_EXT_get(ext))) return NULL; 168 p = ext->value->data; 169 if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it)); 170 return method->d2i(NULL, &p, ext->value->length); 171} 172 173/* Get critical flag and decoded version of extension from a NID. 174 * The "idx" variable returns the last found extension and can 175 * be used to retrieve multiple extensions of the same NID. 176 * However multiple extensions with the same NID is usually 177 * due to a badly encoded certificate so if idx is NULL we 178 * choke if multiple extensions exist. 179 * The "crit" variable is set to the critical value. 180 * The return value is the decoded extension or NULL on 181 * error. The actual error can have several different causes, 182 * the value of *crit reflects the cause: 183 * >= 0, extension found but not decoded (reflects critical value). 184 * -1 extension not found. 185 * -2 extension occurs more than once. 186 */ 187 188void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx) 189{ 190 int lastpos, i; 191 X509_EXTENSION *ex, *found_ex = NULL; 192 if(!x) { 193 if(idx) *idx = -1; 194 if(crit) *crit = -1; 195 return NULL; 196 } 197 if(idx) lastpos = *idx + 1; 198 else lastpos = 0; 199 if(lastpos < 0) lastpos = 0; 200 for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++) 201 { 202 ex = sk_X509_EXTENSION_value(x, i); 203 if(OBJ_obj2nid(ex->object) == nid) { 204 if(idx) { 205 *idx = i; 206 found_ex = ex; 207 break; 208 } else if(found_ex) { 209 /* Found more than one */ 210 if(crit) *crit = -2; 211 return NULL; 212 } 213 found_ex = ex; 214 } 215 } 216 if(found_ex) { 217 /* Found it */ 218 if(crit) *crit = X509_EXTENSION_get_critical(found_ex); 219 return X509V3_EXT_d2i(found_ex); 220 } 221 222 /* Extension not found */ 223 if(idx) *idx = -1; 224 if(crit) *crit = -1; 225 return NULL; 226} 227 228/* This function is a general extension append, replace and delete utility. 229 * The precise operation is governed by the 'flags' value. The 'crit' and 230 * 'value' arguments (if relevant) are the extensions internal structure. 231 */ 232 233int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, 234 int crit, unsigned long flags) 235{ 236 int extidx = -1; 237 int errcode; 238 X509_EXTENSION *ext, *extmp; 239 unsigned long ext_op = flags & X509V3_ADD_OP_MASK; 240 241 /* If appending we don't care if it exists, otherwise 242 * look for existing extension. 243 */ 244 if(ext_op != X509V3_ADD_APPEND) 245 extidx = X509v3_get_ext_by_NID(*x, nid, -1); 246 247 /* See if extension exists */ 248 if(extidx >= 0) { 249 /* If keep existing, nothing to do */ 250 if(ext_op == X509V3_ADD_KEEP_EXISTING) 251 return 1; 252 /* If default then its an error */ 253 if(ext_op == X509V3_ADD_DEFAULT) { 254 errcode = X509V3_R_EXTENSION_EXISTS; 255 goto err; 256 } 257 /* If delete, just delete it */ 258 if(ext_op == X509V3_ADD_DELETE) { 259 if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1; 260 return 1; 261 } 262 } else { 263 /* If replace existing or delete, error since 264 * extension must exist 265 */ 266 if((ext_op == X509V3_ADD_REPLACE_EXISTING) || 267 (ext_op == X509V3_ADD_DELETE)) { 268 errcode = X509V3_R_EXTENSION_NOT_FOUND; 269 goto err; 270 } 271 } 272 273 /* If we get this far then we have to create an extension: 274 * could have some flags for alternative encoding schemes... 275 */ 276 277 ext = X509V3_EXT_i2d(nid, crit, value); 278 279 if(!ext) { 280 X509V3err(X509V3_F_X509V3_ADD1_I2D, X509V3_R_ERROR_CREATING_EXTENSION); 281 return 0; 282 } 283 284 /* If extension exists replace it.. */ 285 if(extidx >= 0) { 286 extmp = sk_X509_EXTENSION_value(*x, extidx); 287 X509_EXTENSION_free(extmp); 288 if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1; 289 return 1; 290 } 291 292 if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1; 293 if(!sk_X509_EXTENSION_push(*x, ext)) return -1; 294 295 return 1; 296 297 err: 298 if(!(flags & X509V3_ADD_SILENT)) 299 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode); 300 return 0; 301} 302 303IMPLEMENT_STACK_OF(X509V3_EXT_METHOD) 304