crypto/x509/x509_trs.c

   1 /* x509_trs.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
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/x509v3.h>
  62
  63
  64 static int tr_cmp(X509_TRUST **a, X509_TRUST **b);
  65 static void trtable_free(X509_TRUST *p);
  66
  67 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
  68 static int trust_any(X509_TRUST *trust, X509 *x, int flags);
  69
  70 static int obj_trust(int id, X509 *x, int flags);
  71 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;
  72
  73 /* WARNING: the following table should be kept in order of trust
  74  * and without any gaps so we can just subtract the minimum trust
  75  * value to get an index into the table
  76  */
  77
  78 static X509_TRUST trstandard[] = {
  79 {X509_TRUST_ANY, 0, trust_any, "Any", 0, NULL},
  80 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
  81 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Client", NID_server_auth, NULL},
  82 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
  83 };
  84
  85 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  86
  87 IMPLEMENT_STACK_OF(X509_TRUST)
  88
  89 static STACK_OF(X509_TRUST) *trtable = NULL;
  90
  91 static int tr_cmp(X509_TRUST **a, X509_TRUST **b)
  92 {
  93         return (*a)->trust - (*b)->trust;
  94 }
  95
  96 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
  97 {
  98 int (*oldtrust)(int , X509 *, int);
  99 oldtrust = default_trust;
 100 default_trust = trust;
 101 return oldtrust;
 102 }
 103
 104
 105 int X509_check_trust(X509 *x, int id, int flags)
 106 {
 107         X509_TRUST *pt;
 108         int idx;
 109         if(id == -1) return 1;
 110         if(!(idx = X509_TRUST_get_by_id(id)))
 111                         return default_trust(id, x, flags);
 112         pt = X509_TRUST_iget(idx);
 113         return pt->check_trust(pt, x, flags);
 114 }
 115
 116 int X509_TRUST_get_count(void)
 117 {
 118         if(!trtable) return X509_TRUST_COUNT;
 119         return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 120 }
 121
 122 X509_TRUST * X509_TRUST_iget(int idx)
 123 {
 124         if(idx < 0) return NULL;
 125         if(idx < X509_TRUST_COUNT) return trstandard + idx;
 126         return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 127 }
 128
 129 int X509_TRUST_get_by_id(int id)
 130 {
 131         X509_TRUST tmp;
 132         int idx;
 133         if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 134                                  return id - X509_TRUST_MIN;
 135         tmp.trust = id;
 136         if(!trtable) return -1;
 137         idx = sk_X509_TRUST_find(trtable, &tmp);
 138         if(idx == -1) return -1;
 139         return idx + X509_TRUST_COUNT;
 140 }
 141
 142 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
 143                                         char *name, int arg1, void *arg2)
 144 {
 145         int idx;
 146         X509_TRUST *trtmp;
 147         /* This is set according to what we change: application can't set it */
 148         flags &= ~X509_TRUST_DYNAMIC;
 149         /* This will always be set for application modified trust entries */
 150         flags |= X509_TRUST_DYNAMIC_NAME;
 151         /* Get existing entry if any */
 152         idx = X509_TRUST_get_by_id(id);
 153         /* Need a new entry */
 154         if(idx == -1) {
 155                 if(!(trtmp = Malloc(sizeof(X509_TRUST)))) {
 156                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 157                         return 0;
 158                 }
 159                 trtmp->flags = X509_TRUST_DYNAMIC;
 160         } else trtmp = X509_TRUST_iget(idx);
 161
 162         /* Free existing name if dynamic */
 163         if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) Free(trtmp->name);
 164         /* dup supplied name */
 165         if(!(trtmp->name = BUF_strdup(name))) {
 166                 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 167                 return 0;
 168         }
 169         /* Keep the dynamic flag of existing entry */
 170         trtmp->flags &= X509_TRUST_DYNAMIC;
 171         /* Set all other flags */
 172         trtmp->flags |= flags;
 173
 174         trtmp->trust = id;
 175         trtmp->check_trust = ck;
 176         trtmp->arg1 = arg1;
 177         trtmp->arg2 = arg2;
 178
 179         /* If its a new entry manage the dynamic table */
 180         if(idx == -1) {
 181                 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 182                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 183                         return 0;
 184                 }
 185                 if (!sk_X509_TRUST_push(trtable, trtmp)) {
 186                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 187                         return 0;
 188                 }
 189         }
 190         return 1;
 191 }
 192
 193 static void trtable_free(X509_TRUST *p)
 194         {
 195         if(!p) return;
 196         if (p->flags & X509_TRUST_DYNAMIC)
 197                 {
 198                 if (p->flags & X509_TRUST_DYNAMIC_NAME)
 199                         Free(p->name);
 200                 Free(p);
 201                 }
 202         }
 203
 204 void X509_TRUST_cleanup(void)
 205 {
 206         int i;
 207         for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
 208         sk_X509_TRUST_pop_free(trtable, trtable_free);
 209         trtable = NULL;
 210 }
 211
 212 int X509_TRUST_get_flags(X509_TRUST *xp)
 213 {
 214         return xp->flags;
 215 }
 216
 217 char *X509_TRUST_get0_name(X509_TRUST *xp)
 218 {
 219         return xp->name;
 220 }
 221
 222 int X509_TRUST_get_trust(X509_TRUST *xp)
 223 {
 224         return xp->trust;
 225 }
 226
 227 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
 228 {
 229         if(x->aux) return obj_trust(trust->arg1, x, flags);
 230         /* we don't have any trust settings: for compatibility
 231          * we return trusted if it is self signed
 232          */
 233         X509_check_purpose(x, -1, 0);
 234         if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
 235         else return X509_TRUST_UNTRUSTED;
 236 }
 237
 238 static int obj_trust(int id, X509 *x, int flags)
 239 {
 240         ASN1_OBJECT *obj;
 241         int i;
 242         X509_CERT_AUX *ax;
 243         ax = x->aux;
 244         if(!ax) return X509_TRUST_UNTRUSTED;
 245         if(ax->reject) {
 246                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
 247                         obj = sk_ASN1_OBJECT_value(ax->reject, i);
 248                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
 249                 }
 250         }
 251         if(ax->trust) {
 252                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
 253                         obj = sk_ASN1_OBJECT_value(ax->trust, i);
 254                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
 255                 }
 256         }
 257         return X509_TRUST_UNTRUSTED;
 258 }
 259
 260 static int trust_any(X509_TRUST *trust, X509 *x, int flags)
 261 {
 262         return X509_TRUST_TRUSTED;
 263 }