crypto/x509v3/v3_lib.c

   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
  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 X509V3_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
 108 X509V3_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
 116 int 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
 123 int 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
 140 void X509V3_EXT_cleanup(void)
 141 {
 142         sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
 143         ext_list = NULL;
 144 }
 145
 146 static 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
 155 int X509V3_add_standard_extensions(void)
 156 {
 157         return 1;
 158 }
 159
 160 /* Return an extension internal structure */
 161
 162 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
 163 {
 164         X509V3_EXT_METHOD *method;
 165         unsigned char *p;
 166         if(!(method = X509V3_EXT_get(ext)) || !method->d2i) return NULL;
 167         p = ext->value->data;
 168         return method->d2i(NULL, &p, ext->value->length);
 169 }
 170
 171 /* Get critical flag and decoded version of extension from a NID.
 172  * The "idx" variable returns the last found extension and can
 173  * be used to retrieve multiple extensions of the same NID.
 174  * However multiple extensions with the same NID is usually
 175  * due to a badly encoded certificate so if idx is NULL we
 176  * choke if multiple extensions exist.
 177  * The "crit" variable is set to the critical value.
 178  * The return value is the decoded extension or NULL on
 179  * error. The actual error can have several different causes,
 180  * the value of *crit reflects the cause:
 181  * >= 0, extension found but not decoded (reflects critical value).
 182  * -1 extension not found.
 183  * -2 extension occurs more than once.
 184  */
 185
 186 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
 187 {
 188         int lastpos, i;
 189         X509_EXTENSION *ex, *found_ex = NULL;
 190         if(!x) {
 191                 if(idx) *idx = -1;
 192                 if(crit) *crit = -1;
 193                 return NULL;
 194         }
 195         if(idx) lastpos = *idx + 1;
 196         else lastpos = 0;
 197         if(lastpos < 0) lastpos = 0;
 198         for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
 199         {
 200                 ex = sk_X509_EXTENSION_value(x, i);
 201                 if(OBJ_obj2nid(ex->object) == nid) {
 202                         if(idx) {
 203                                 *idx = i;
 204                                 break;
 205                         } else if(found_ex) {
 206                                 /* Found more than one */
 207                                 if(crit) *crit = -2;
 208                                 return NULL;
 209                         }
 210                         found_ex = ex;
 211                 }
 212         }
 213         if(found_ex) {
 214                 /* Found it */
 215                 if(crit) *crit = found_ex->critical;
 216                 return X509V3_EXT_d2i(found_ex);
 217         }
 218
 219         /* Extension not found */
 220         if(idx) *idx = -1;
 221         if(crit) *crit = -1;
 222         return NULL;
 223 }
 224
 225 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)