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_1bit(X509_TRUST *trust, X509 *x, int flags);
  68 static int trust_any(X509_TRUST *trust, X509 *x, int flags);
  69
  70 /* WARNING: the following table should be kept in order of trust
  71  * and without any gaps so we can just subtract the minimum trust
  72  * value to get an index into the table
  73  */
  74
  75 static X509_TRUST trstandard[] = {
  76 {X509_TRUST_ANY, 0, trust_any, "Any", 0, NULL},
  77 {X509_TRUST_SSL_CLIENT, 0, trust_1bit, "SSL Client", X509_TRUST_BIT_SSL_CLIENT, NULL},
  78 {X509_TRUST_SSL_SERVER, 0, trust_1bit, "SSL Client", X509_TRUST_BIT_SSL_SERVER, NULL},
  79 {X509_TRUST_EMAIL, 0, trust_1bit, "S/MIME email", X509_TRUST_BIT_EMAIL, NULL},
  80 {X509_TRUST_OBJECT_SIGN, 0, trust_1bit, "Object Signing", X509_TRUST_BIT_OBJECT_SIGN, NULL},
  81 };
  82
  83 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  84
  85 IMPLEMENT_STACK_OF(X509_TRUST)
  86
  87 static STACK_OF(X509_TRUST) *trtable = NULL;
  88
  89 static int tr_cmp(X509_TRUST **a, X509_TRUST **b)
  90 {
  91         return (*a)->trust - (*b)->trust;
  92 }
  93
  94 int X509_check_trust(X509 *x, int id, int flags)
  95 {
  96         X509_TRUST *pt;
  97         int idx;
  98         if(id == -1) return 1;
  99         if(!(idx = X509_TRUST_get_by_id(id))) return 0;
 100         pt = X509_TRUST_iget(idx);
 101         return pt->check_trust(pt, x, flags);
 102 }
 103
 104 int X509_TRUST_get_count(void)
 105 {
 106         if(!trtable) return X509_TRUST_COUNT;
 107         return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 108 }
 109
 110 X509_TRUST * X509_TRUST_iget(int idx)
 111 {
 112         if(idx < 0) return NULL;
 113         if(idx < X509_TRUST_COUNT) return trstandard + idx;
 114         return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 115 }
 116
 117 int X509_TRUST_get_by_id(int id)
 118 {
 119         X509_TRUST tmp;
 120         int idx;
 121         if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 122                                  return id - X509_TRUST_MIN;
 123         tmp.trust = id;
 124         if(!trtable) return -1;
 125         idx = sk_X509_TRUST_find(trtable, &tmp);
 126         if(idx == -1) return -1;
 127         return idx + X509_TRUST_COUNT;
 128 }
 129
 130 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
 131                                         char *name, int arg1, void *arg2)
 132 {
 133         int idx;
 134         X509_TRUST *trtmp;
 135         /* This is set according to what we change: application can't set it */
 136         flags &= ~X509_TRUST_DYNAMIC;
 137         /* This will always be set for application modified trust entries */
 138         flags |= X509_TRUST_DYNAMIC_NAME;
 139         /* Get existing entry if any */
 140         idx = X509_TRUST_get_by_id(id);
 141         /* Need a new entry */
 142         if(idx == -1) {
 143                 if(!(trtmp = Malloc(sizeof(X509_TRUST)))) {
 144                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 145                         return 0;
 146                 }
 147                 trtmp->flags = X509_TRUST_DYNAMIC;
 148         } else trtmp = X509_TRUST_iget(idx);
 149
 150         /* Free existing name if dynamic */
 151         if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) Free(trtmp->name);
 152         /* dup supplied name */
 153         if(!(trtmp->name = BUF_strdup(name))) {
 154                 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 155                 return 0;
 156         }
 157         /* Keep the dynamic flag of existing entry */
 158         trtmp->flags &= X509_TRUST_DYNAMIC;
 159         /* Set all other flags */
 160         trtmp->flags |= flags;
 161
 162         trtmp->trust = id;
 163         trtmp->check_trust = ck;
 164         trtmp->arg1 = arg1;
 165         trtmp->arg2 = arg2;
 166
 167         /* If its a new entry manage the dynamic table */
 168         if(idx == -1) {
 169                 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 170                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 171                         return 0;
 172                 }
 173                 if (!sk_X509_TRUST_push(trtable, trtmp)) {
 174                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 175                         return 0;
 176                 }
 177         }
 178         return 1;
 179 }
 180
 181 static void trtable_free(X509_TRUST *p)
 182         {
 183         if(!p) return;
 184         if (p->flags & X509_TRUST_DYNAMIC)
 185                 {
 186                 if (p->flags & X509_TRUST_DYNAMIC_NAME)
 187                         Free(p->name);
 188                 Free(p);
 189                 }
 190         }
 191
 192 void X509_TRUST_cleanup(void)
 193 {
 194         int i;
 195         for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
 196         sk_X509_TRUST_pop_free(trtable, trtable_free);
 197         trtable = NULL;
 198 }
 199
 200 int X509_TRUST_get_flags(X509_TRUST *xp)
 201 {
 202         return xp->flags;
 203 }
 204
 205 char *X509_TRUST_iget_name(X509_TRUST *xp)
 206 {
 207         return xp->name;
 208 }
 209
 210 int X509_TRUST_get_trust(X509_TRUST *xp)
 211 {
 212         return xp->trust;
 213 }
 214
 215 static int trust_1bit(X509_TRUST *trust, X509 *x, int flags)
 216 {
 217         X509_CERT_AUX *ax;
 218         ax = x->aux;
 219         if(ax) {
 220                 if(ax->reject
 221                         && ( ASN1_BIT_STRING_get_bit(ax->reject, X509_TRUST_BIT_ALL)
 222                         || ASN1_BIT_STRING_get_bit(ax->reject, trust->arg1)))
 223                                                         return X509_TRUST_REJECTED;
 224                 if(ax->trust && (ASN1_BIT_STRING_get_bit(ax->trust, X509_TRUST_BIT_ALL)
 225                         || ASN1_BIT_STRING_get_bit(ax->trust, trust->arg1)))
 226                                                         return X509_TRUST_TRUSTED;
 227                 return X509_TRUST_UNTRUSTED;
 228         }
 229         /* we don't have any trust settings: for compatability
 230          * we return trusted if it is self signed
 231          */
 232         X509_check_purpose(x, -1, 0);
 233         if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
 234         else return X509_TRUST_UNTRUSTED;
 235 }
 236
 237 static int trust_any(X509_TRUST *trust, X509 *x, int flags)
 238 {
 239         return X509_TRUST_TRUSTED;
 240 }