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 static STACK *ext_list = NULL;
  66
  67 static int ext_cmp(X509V3_EXT_METHOD **a, X509V3_EXT_METHOD **b);
  68 static void ext_list_free(X509V3_EXT_METHOD *ext);
  69
  70 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
  71 {
  72         if(!ext_list && !(ext_list = sk_new(ext_cmp))) {
  73                 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
  74                 return 0;
  75         }
  76         if(!sk_push(ext_list, (char *)ext)) {
  77                 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
  78                 return 0;
  79         }
  80         return 1;
  81 }
  82
  83 static int ext_cmp(X509V3_EXT_METHOD **a, X509V3_EXT_METHOD **b)
  84 {
  85         return ((*a)->ext_nid - (*b)->ext_nid);
  86 }
  87
  88 X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
  89 {
  90         X509V3_EXT_METHOD tmp;
  91         int idx;
  92         tmp.ext_nid = nid;
  93         if(!ext_list || (tmp.ext_nid < 0) ) return NULL;
  94         idx = sk_find(ext_list, (char *)&tmp);
  95         if(idx == -1) return NULL;
  96         return (X509V3_EXT_METHOD *)sk_value(ext_list, idx);
  97 }
  98
  99 X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
 100 {
 101         int nid;
 102         if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL;
 103         return X509V3_EXT_get_nid(nid);
 104 }
 105
 106
 107 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
 108 {
 109         for(;extlist->ext_nid!=-1;extlist++)
 110                         if(!X509V3_EXT_add(extlist)) return 0;
 111         return 1;
 112 }
 113
 114 int X509V3_EXT_add_alias(int nid_to, int nid_from)
 115 {
 116         X509V3_EXT_METHOD *ext, *tmpext;
 117         if(!(ext = X509V3_EXT_get_nid(nid_from))) {
 118                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
 119                 return 0;
 120         }
 121         if(!(tmpext = (X509V3_EXT_METHOD *)Malloc(sizeof(X509V3_EXT_METHOD)))) {
 122                 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE);
 123                 return 0;
 124         }
 125         *tmpext = *ext;
 126         tmpext->ext_nid = nid_to;
 127         tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
 128         return 1;
 129 }
 130
 131 void X509V3_EXT_cleanup(void)
 132 {
 133         sk_pop_free(ext_list, ext_list_free);
 134         ext_list = NULL;
 135 }
 136
 137 static void ext_list_free(X509V3_EXT_METHOD *ext)
 138 {
 139         if(ext->ext_flags & X509V3_EXT_DYNAMIC) Free(ext);
 140 }
 141
 142 extern X509V3_EXT_METHOD v3_bcons, v3_nscert, v3_key_usage, v3_ext_ku;
 143 extern X509V3_EXT_METHOD v3_pkey_usage_period, v3_sxnet;
 144 extern X509V3_EXT_METHOD v3_ns_ia5_list[], v3_alt[], v3_skey_id, v3_akey_id;
 145
 146 extern X509V3_EXT_METHOD v3_crl_num, v3_crl_reason, v3_cpols, v3_crld;
 147
 148 int X509V3_add_standard_extensions(void)
 149 {
 150         X509V3_EXT_add_list(v3_ns_ia5_list);
 151         X509V3_EXT_add_list(v3_alt);
 152         X509V3_EXT_add(&v3_bcons);
 153         X509V3_EXT_add(&v3_nscert);
 154         X509V3_EXT_add(&v3_key_usage);
 155         X509V3_EXT_add(&v3_ext_ku);
 156         X509V3_EXT_add(&v3_skey_id);
 157         X509V3_EXT_add(&v3_akey_id);
 158         X509V3_EXT_add(&v3_pkey_usage_period);
 159         X509V3_EXT_add(&v3_crl_num);
 160         X509V3_EXT_add(&v3_sxnet);
 161         X509V3_EXT_add(&v3_crl_reason);
 162         X509V3_EXT_add(&v3_cpols);
 163         X509V3_EXT_add(&v3_crld);
 164         return 1;
 165 }
 166
 167 /* Return an extension internal structure */
 168
 169 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
 170 {
 171         X509V3_EXT_METHOD *method;
 172         unsigned char *p;
 173         if(!(method = X509V3_EXT_get(ext)) || !method->d2i) return NULL;
 174         p = ext->value->data;
 175         return method->d2i(NULL, &p, ext->value->length);
 176 }
 177
 178 /* Get critical flag and decoded version of extension from a NID.
 179  * The "idx" variable returns the last found extension and can
 180  * be used to retrieve multiple extensions of the same NID.
 181  * However multiple extensions with the same NID is usually
 182  * due to a badly encoded certificate so if idx is NULL we
 183  * choke if multiple extensions exist.
 184  * The "crit" variable is set to the critical value.
 185  * The return value is the decoded extension or NULL on
 186  * error. The actual error can have several different causes,
 187  * the value of *crit reflects the cause:
 188  * >= 0, extension found but not decoded (reflects critical value).
 189  * -1 extension not found.
 190  * -2 extension occurs more than once.
 191  */
 192
 193 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
 194 {
 195         int lastpos, i;
 196         X509_EXTENSION *ex, *found_ex = NULL;
 197         if(!x) {
 198                 if(idx) *idx = -1;
 199                 if(crit) *crit = -1;
 200                 return NULL;
 201         }
 202         if(idx) lastpos = *idx + 1;
 203         else lastpos = 0;
 204         if(lastpos < 0) lastpos = 0;
 205         for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
 206         {
 207                 ex = sk_X509_EXTENSION_value(x, i);
 208                 if(OBJ_obj2nid(ex->object) == nid) {
 209                         if(idx) {
 210                                 *idx = i;
 211                                 break;
 212                         } else if(found_ex) {
 213                                 /* Found more than one */
 214                                 if(crit) *crit = -2;
 215                                 return NULL;
 216                         }
 217                         found_ex = ex;
 218                 }
 219         }
 220         if(found_ex) {
 221                 /* Found it */
 222                 if(crit) *crit = found_ex->critical;
 223                 return X509V3_EXT_d2i(found_ex);
 224         }
 225
 226         /* Extension not found */
 227         if(idx) *idx = -1;
 228         if(crit) *crit = -1;
 229         return NULL;
 230 }
 231
 232 /* As above but for a passed certificate */
 233
 234 void *X509V3_X509_get_d2i(X509 *x, int nid, int *crit, int *idx)
 235 {
 236         return X509V3_get_d2i(x->cert_info->extensions, nid, crit, idx);
 237 }
 238
 239 void *X509V3_CRL_get_d2i(X509_CRL *x, int nid, int *crit, int *idx)
 240 {
 241         return X509V3_get_d2i(x->crl->extensions, nid, crit, idx);
 242 }
 243
 244 void *X509V3_REVOKED_get_d2i(X509_REVOKED *x, int nid, int *crit, int *idx)
 245 {
 246         return X509V3_get_d2i(x->extensions, nid, crit, idx);
 247 }