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(X509V3_EXT_METHOD **a, X509V3_EXT_METHOD **b);
  70 static void ext_list_free(X509V3_EXT_METHOD *ext);
  71
  72 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
  73 {
  74         if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) {
  75                 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
  76                 return 0;
  77         }
  78         if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
  79                 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
  80                 return 0;
  81         }
  82         return 1;
  83 }
  84
  85 static int ext_cmp(X509V3_EXT_METHOD **a, X509V3_EXT_METHOD **b)
  86 {
  87         return ((*a)->ext_nid - (*b)->ext_nid);
  88 }
  89
  90 X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
  91 {
  92         X509V3_EXT_METHOD tmp, *t = &tmp, **ret;
  93         int idx;
  94         if(nid < 0) return NULL;
  95         tmp.ext_nid = nid;
  96         ret = (X509V3_EXT_METHOD **) OBJ_bsearch((char *)&t,
  97                         (char *)standard_exts, STANDARD_EXTENSION_COUNT,
  98                         sizeof(X509V3_EXT_METHOD *), (int (*)(const void *, const void *))ext_cmp);
  99         if(ret) return *ret;
 100         if(!ext_list) return NULL;
 101         idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
 102         if(idx == -1) return NULL;
 103         return sk_X509V3_EXT_METHOD_value(ext_list, idx);
 104 }
 105
 106 X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
 107 {
 108         int nid;
 109         if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL;
 110         return X509V3_EXT_get_nid(nid);
 111 }
 112
 113
 114 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
 115 {
 116         for(;extlist->ext_nid!=-1;extlist++)
 117                         if(!X509V3_EXT_add(extlist)) return 0;
 118         return 1;
 119 }
 120
 121 int X509V3_EXT_add_alias(int nid_to, int nid_from)
 122 {
 123         X509V3_EXT_METHOD *ext, *tmpext;
 124         if(!(ext = X509V3_EXT_get_nid(nid_from))) {
 125                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
 126                 return 0;
 127         }
 128         if(!(tmpext = (X509V3_EXT_METHOD *)Malloc(sizeof(X509V3_EXT_METHOD)))) {
 129                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE);
 130                 return 0;
 131         }
 132         *tmpext = *ext;
 133         tmpext->ext_nid = nid_to;
 134         tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
 135         return X509V3_EXT_add(tmpext);
 136 }
 137
 138 void X509V3_EXT_cleanup(void)
 139 {
 140         sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
 141         ext_list = NULL;
 142 }
 143
 144 static void ext_list_free(X509V3_EXT_METHOD *ext)
 145 {
 146         if(ext->ext_flags & X509V3_EXT_DYNAMIC) Free(ext);
 147 }
 148
 149 /* Legacy function: we don't need to add standard extensions
 150  * any more because they are now kept in ext_dat.h.
 151  */
 152
 153 int X509V3_add_standard_extensions(void)
 154 {
 155         return 1;
 156 }
 157
 158 /* Return an extension internal structure */
 159
 160 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
 161 {
 162         X509V3_EXT_METHOD *method;
 163         unsigned char *p;
 164         if(!(method = X509V3_EXT_get(ext)) || !method->d2i) return NULL;
 165         p = ext->value->data;
 166         return method->d2i(NULL, &p, ext->value->length);
 167 }
 168
 169 /* Get critical flag and decoded version of extension from a NID.
 170  * The "idx" variable returns the last found extension and can
 171  * be used to retrieve multiple extensions of the same NID.
 172  * However multiple extensions with the same NID is usually
 173  * due to a badly encoded certificate so if idx is NULL we
 174  * choke if multiple extensions exist.
 175  * The "crit" variable is set to the critical value.
 176  * The return value is the decoded extension or NULL on
 177  * error. The actual error can have several different causes,
 178  * the value of *crit reflects the cause:
 179  * >= 0, extension found but not decoded (reflects critical value).
 180  * -1 extension not found.
 181  * -2 extension occurs more than once.
 182  */
 183
 184 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
 185 {
 186         int lastpos, i;
 187         X509_EXTENSION *ex, *found_ex = NULL;
 188         if(!x) {
 189                 if(idx) *idx = -1;
 190                 if(crit) *crit = -1;
 191                 return NULL;
 192         }
 193         if(idx) lastpos = *idx + 1;
 194         else lastpos = 0;
 195         if(lastpos < 0) lastpos = 0;
 196         for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
 197         {
 198                 ex = sk_X509_EXTENSION_value(x, i);
 199                 if(OBJ_obj2nid(ex->object) == nid) {
 200                         if(idx) {
 201                                 *idx = i;
 202                                 break;
 203                         } else if(found_ex) {
 204                                 /* Found more than one */
 205                                 if(crit) *crit = -2;
 206                                 return NULL;
 207                         }
 208                         found_ex = ex;
 209                 }
 210         }
 211         if(found_ex) {
 212                 /* Found it */
 213                 if(crit) *crit = found_ex->critical;
 214                 return X509V3_EXT_d2i(found_ex);
 215         }
 216
 217         /* Extension not found */
 218         if(idx) *idx = -1;
 219         if(crit) *crit = -1;
 220         return NULL;
 221 }
 222
 223 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)