crypto/x509v3/v3_lib.c

   1 /* v3_lib.c */
   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 #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 int X509V3_EXT_free(int nid, void *ext_data)
 120 {
 121             const X509V3_EXT_METHOD *ext_method = X509V3_EXT_get_nid(nid);
 122             if (ext_method == NULL)
 123             {
 124                     X509V3err(X509V3_F_X509V3_EXT_FREE, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
 125                     return 0;
 126             }
 127
 128             if (ext_method->it != NULL)
 129                     ASN1_item_free(ext_data, ASN1_ITEM_ptr(ext_method->it));
 130             else if (ext_method->ext_free != NULL)
 131                     ext_method->ext_free(ext_data);
 132             else
 133             {
 134                     X509V3err(X509V3_F_X509V3_EXT_FREE, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
 135                     return 0;
 136             }
 137
 138             return 1;
 139 }
 140
 141 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
 142 {
 143         for(;extlist->ext_nid!=-1;extlist++)
 144                         if(!X509V3_EXT_add(extlist)) return 0;
 145         return 1;
 146 }
 147
 148 int X509V3_EXT_add_alias(int nid_to, int nid_from)
 149 {
 150         const X509V3_EXT_METHOD *ext;
 151         X509V3_EXT_METHOD *tmpext;
 152
 153         if(!(ext = X509V3_EXT_get_nid(nid_from))) {
 154                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
 155                 return 0;
 156         }
 157         if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
 158                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE);
 159                 return 0;
 160         }
 161         *tmpext = *ext;
 162         tmpext->ext_nid = nid_to;
 163         tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
 164         return X509V3_EXT_add(tmpext);
 165 }
 166
 167 void X509V3_EXT_cleanup(void)
 168 {
 169         sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
 170         ext_list = NULL;
 171 }
 172
 173 static void ext_list_free(X509V3_EXT_METHOD *ext)
 174 {
 175         if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext);
 176 }
 177
 178 /* Legacy function: we don't need to add standard extensions
 179  * any more because they are now kept in ext_dat.h.
 180  */
 181
 182 int X509V3_add_standard_extensions(void)
 183 {
 184         return 1;
 185 }
 186
 187 /* Return an extension internal structure */
 188
 189 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
 190 {
 191         const X509V3_EXT_METHOD *method;
 192         const unsigned char *p;
 193
 194         if(!(method = X509V3_EXT_get(ext))) return NULL;
 195         p = ext->value->data;
 196         if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it));
 197         return method->d2i(NULL, &p, ext->value->length);
 198 }
 199
 200 /* Get critical flag and decoded version of extension from a NID.
 201  * The "idx" variable returns the last found extension and can
 202  * be used to retrieve multiple extensions of the same NID.
 203  * However multiple extensions with the same NID is usually
 204  * due to a badly encoded certificate so if idx is NULL we
 205  * choke if multiple extensions exist.
 206  * The "crit" variable is set to the critical value.
 207  * The return value is the decoded extension or NULL on
 208  * error. The actual error can have several different causes,
 209  * the value of *crit reflects the cause:
 210  * >= 0, extension found but not decoded (reflects critical value).
 211  * -1 extension not found.
 212  * -2 extension occurs more than once.
 213  */
 214
 215 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
 216 {
 217         int lastpos, i;
 218         X509_EXTENSION *ex, *found_ex = NULL;
 219         if(!x) {
 220                 if(idx) *idx = -1;
 221                 if(crit) *crit = -1;
 222                 return NULL;
 223         }
 224         if(idx) lastpos = *idx + 1;
 225         else lastpos = 0;
 226         if(lastpos < 0) lastpos = 0;
 227         for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
 228         {
 229                 ex = sk_X509_EXTENSION_value(x, i);
 230                 if(OBJ_obj2nid(ex->object) == nid) {
 231                         if(idx) {
 232                                 *idx = i;
 233                                 found_ex = ex;
 234                                 break;
 235                         } else if(found_ex) {
 236                                 /* Found more than one */
 237                                 if(crit) *crit = -2;
 238                                 return NULL;
 239                         }
 240                         found_ex = ex;
 241                 }
 242         }
 243         if(found_ex) {
 244                 /* Found it */
 245                 if(crit) *crit = X509_EXTENSION_get_critical(found_ex);
 246                 return X509V3_EXT_d2i(found_ex);
 247         }
 248
 249         /* Extension not found */
 250         if(idx) *idx = -1;
 251         if(crit) *crit = -1;
 252         return NULL;
 253 }
 254
 255 /* This function is a general extension append, replace and delete utility.
 256  * The precise operation is governed by the 'flags' value. The 'crit' and
 257  * 'value' arguments (if relevant) are the extensions internal structure.
 258  */
 259
 260 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
 261                                         int crit, unsigned long flags)
 262 {
 263         int extidx = -1;
 264         int errcode;
 265         X509_EXTENSION *ext, *extmp;
 266         unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
 267
 268         /* If appending we don't care if it exists, otherwise
 269          * look for existing extension.
 270          */
 271         if(ext_op != X509V3_ADD_APPEND)
 272                 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
 273
 274         /* See if extension exists */
 275         if(extidx >= 0) {
 276                 /* If keep existing, nothing to do */
 277                 if(ext_op == X509V3_ADD_KEEP_EXISTING)
 278                         return 1;
 279                 /* If default then its an error */
 280                 if(ext_op == X509V3_ADD_DEFAULT) {
 281                         errcode = X509V3_R_EXTENSION_EXISTS;
 282                         goto err;
 283                 }
 284                 /* If delete, just delete it */
 285                 if(ext_op == X509V3_ADD_DELETE) {
 286                         if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1;
 287                         return 1;
 288                 }
 289         } else {
 290                 /* If replace existing or delete, error since
 291                  * extension must exist
 292                  */
 293                 if((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
 294                    (ext_op == X509V3_ADD_DELETE)) {
 295                         errcode = X509V3_R_EXTENSION_NOT_FOUND;
 296                         goto err;
 297                 }
 298         }
 299
 300         /* If we get this far then we have to create an extension:
 301          * could have some flags for alternative encoding schemes...
 302          */
 303
 304         ext = X509V3_EXT_i2d(nid, crit, value);
 305
 306         if(!ext) {
 307                 X509V3err(X509V3_F_X509V3_ADD1_I2D, X509V3_R_ERROR_CREATING_EXTENSION);
 308                 return 0;
 309         }
 310
 311         /* If extension exists replace it.. */
 312         if(extidx >= 0) {
 313                 extmp = sk_X509_EXTENSION_value(*x, extidx);
 314                 X509_EXTENSION_free(extmp);
 315                 if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1;
 316                 return 1;
 317         }
 318
 319         if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1;
 320         if(!sk_X509_EXTENSION_push(*x, ext)) return -1;
 321
 322         return 1;
 323
 324         err:
 325         if(!(flags & X509V3_ADD_SILENT))
 326                 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
 327         return 0;
 328 }
 329
 330 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)