1 /* v3_lib.c */ 2 /* Written by Dr Stephen N Henson (steve (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 67 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL; 68 69 static int ext_cmp(const X509V3_EXT_METHOD * const *a, 70 const X509V3_EXT_METHOD * const *b); 71 static void ext_list_free(X509V3_EXT_METHOD *ext); 72 73 int 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 86 static 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 92 DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, const X509V3_EXT_METHOD *, 93 ext); 94 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, 95 const X509V3_EXT_METHOD *, ext); 96 97 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid) 98 { 99 X509V3_EXT_METHOD tmp; 100 const X509V3_EXT_METHOD *t = &tmp, * const *ret; 101 int idx; 102 if(nid < 0) return NULL; 103 tmp.ext_nid = nid; 104 ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT); 105 if(ret) return *ret; 106 if(!ext_list) return NULL; 107 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp); 108 if(idx == -1) return NULL; 109 return sk_X509V3_EXT_METHOD_value(ext_list, idx); 110 } 111 112 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext) 113 { 114 int nid; 115 if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL; 116 return X509V3_EXT_get_nid(nid); 117 } 118 119 120 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist) 121 { 122 for(;extlist->ext_nid!=-1;extlist++) 123 if(!X509V3_EXT_add(extlist)) return 0; 124 return 1; 125 } 126 127 int X509V3_EXT_add_alias(int nid_to, int nid_from) 128 { 129 const X509V3_EXT_METHOD *ext; 130 X509V3_EXT_METHOD *tmpext; 131 132 if(!(ext = X509V3_EXT_get_nid(nid_from))) { 133 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND); 134 return 0; 135 } 136 if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) { 137 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE); 138 return 0; 139 } 140 *tmpext = *ext; 141 tmpext->ext_nid = nid_to; 142 tmpext->ext_flags |= X509V3_EXT_DYNAMIC; 143 return X509V3_EXT_add(tmpext); 144 } 145 146 void X509V3_EXT_cleanup(void) 147 { 148 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free); 149 ext_list = NULL; 150 } 151 152 static void ext_list_free(X509V3_EXT_METHOD *ext) 153 { 154 if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext); 155 } 156 157 /* Legacy function: we don't need to add standard extensions 158 * any more because they are now kept in ext_dat.h. 159 */ 160 161 int X509V3_add_standard_extensions(void) 162 { 163 return 1; 164 } 165 166 /* Return an extension internal structure */ 167 168 void *X509V3_EXT_d2i(X509_EXTENSION *ext) 169 { 170 const X509V3_EXT_METHOD *method; 171 const unsigned char *p; 172 173 if(!(method = X509V3_EXT_get(ext))) return NULL; 174 p = ext->value->data; 175 if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it)); 176 return method->d2i(NULL, &p, ext->value->length); 177 } 178 179 /* Get critical flag and decoded version of extension from a NID. 180 * The "idx" variable returns the last found extension and can 181 * be used to retrieve multiple extensions of the same NID. 182 * However multiple extensions with the same NID is usually 183 * due to a badly encoded certificate so if idx is NULL we 184 * choke if multiple extensions exist. 185 * The "crit" variable is set to the critical value. 186 * The return value is the decoded extension or NULL on 187 * error. The actual error can have several different causes, 188 * the value of *crit reflects the cause: 189 * >= 0, extension found but not decoded (reflects critical value). 190 * -1 extension not found. 191 * -2 extension occurs more than once. 192 */ 193 194 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx) 195 { 196 int lastpos, i; 197 X509_EXTENSION *ex, *found_ex = NULL; 198 if(!x) { 199 if(idx) *idx = -1; 200 if(crit) *crit = -1; 201 return NULL; 202 } 203 if(idx) lastpos = *idx + 1; 204 else lastpos = 0; 205 if(lastpos < 0) lastpos = 0; 206 for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++) 207 { 208 ex = sk_X509_EXTENSION_value(x, i); 209 if(OBJ_obj2nid(ex->object) == nid) { 210 if(idx) { 211 *idx = i; 212 found_ex = ex; 213 break; 214 } else if(found_ex) { 215 /* Found more than one */ 216 if(crit) *crit = -2; 217 return NULL; 218 } 219 found_ex = ex; 220 } 221 } 222 if(found_ex) { 223 /* Found it */ 224 if(crit) *crit = X509_EXTENSION_get_critical(found_ex); 225 return X509V3_EXT_d2i(found_ex); 226 } 227 228 /* Extension not found */ 229 if(idx) *idx = -1; 230 if(crit) *crit = -1; 231 return NULL; 232 } 233 234 /* This function is a general extension append, replace and delete utility. 235 * The precise operation is governed by the 'flags' value. The 'crit' and 236 * 'value' arguments (if relevant) are the extensions internal structure. 237 */ 238 239 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value, 240 int crit, unsigned long flags) 241 { 242 int extidx = -1; 243 int errcode; 244 X509_EXTENSION *ext, *extmp; 245 unsigned long ext_op = flags & X509V3_ADD_OP_MASK; 246 247 /* If appending we don't care if it exists, otherwise 248 * look for existing extension. 249 */ 250 if(ext_op != X509V3_ADD_APPEND) 251 extidx = X509v3_get_ext_by_NID(*x, nid, -1); 252 253 /* See if extension exists */ 254 if(extidx >= 0) { 255 /* If keep existing, nothing to do */ 256 if(ext_op == X509V3_ADD_KEEP_EXISTING) 257 return 1; 258 /* If default then its an error */ 259 if(ext_op == X509V3_ADD_DEFAULT) { 260 errcode = X509V3_R_EXTENSION_EXISTS; 261 goto err; 262 } 263 /* If delete, just delete it */ 264 if(ext_op == X509V3_ADD_DELETE) { 265 if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1; 266 return 1; 267 } 268 } else { 269 /* If replace existing or delete, error since 270 * extension must exist 271 */ 272 if((ext_op == X509V3_ADD_REPLACE_EXISTING) || 273 (ext_op == X509V3_ADD_DELETE)) { 274 errcode = X509V3_R_EXTENSION_NOT_FOUND; 275 goto err; 276 } 277 } 278 279 /* If we get this far then we have to create an extension: 280 * could have some flags for alternative encoding schemes... 281 */ 282 283 ext = X509V3_EXT_i2d(nid, crit, value); 284 285 if(!ext) { 286 X509V3err(X509V3_F_X509V3_ADD1_I2D, X509V3_R_ERROR_CREATING_EXTENSION); 287 return 0; 288 } 289 290 /* If extension exists replace it.. */ 291 if(extidx >= 0) { 292 extmp = sk_X509_EXTENSION_value(*x, extidx); 293 X509_EXTENSION_free(extmp); 294 if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1; 295 return 1; 296 } 297 298 if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1; 299 if(!sk_X509_EXTENSION_push(*x, ext)) return -1; 300 301 return 1; 302 303 err: 304 if(!(flags & X509V3_ADD_SILENT)) 305 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode); 306 return 0; 307 } 308 309 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD) 310
