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(const X509_TRUST * const *a,
  65                 const X509_TRUST * const *b);
  66 static void trtable_free(X509_TRUST *p);
  67
  68 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
  69 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
  70
  71 static int obj_trust(int id, X509 *x, int flags);
  72 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;
  73
  74 /* WARNING: the following table should be kept in order of trust
  75  * and without any gaps so we can just subtract the minimum trust
  76  * value to get an index into the table
  77  */
  78
  79 static X509_TRUST trstandard[] = {
  80 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
  81 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
  82 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Client", NID_server_auth, NULL},
  83 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
  84 };
  85
  86 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  87
  88 IMPLEMENT_STACK_OF(X509_TRUST)
  89
  90 static STACK_OF(X509_TRUST) *trtable = NULL;
  91
  92 static int tr_cmp(const X509_TRUST * const *a,
  93                 const X509_TRUST * const *b)
  94 {
  95         return (*a)->trust - (*b)->trust;
  96 }
  97
  98 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
  99 {
 100 int (*oldtrust)(int , X509 *, int);
 101 oldtrust = default_trust;
 102 default_trust = trust;
 103 return oldtrust;
 104 }
 105
 106
 107 int X509_check_trust(X509 *x, int id, int flags)
 108 {
 109         X509_TRUST *pt;
 110         int idx;
 111         if(id == -1) return 1;
 112         idx = X509_TRUST_get_by_id(id);
 113         if(idx == -1) return default_trust(id, x, flags);
 114         pt = X509_TRUST_get0(idx);
 115         return pt->check_trust(pt, x, flags);
 116 }
 117
 118 int X509_TRUST_get_count(void)
 119 {
 120         if(!trtable) return X509_TRUST_COUNT;
 121         return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 122 }
 123
 124 X509_TRUST * X509_TRUST_get0(int idx)
 125 {
 126         if(idx < 0) return NULL;
 127         if(idx < X509_TRUST_COUNT) return trstandard + idx;
 128         return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 129 }
 130
 131 int X509_TRUST_get_by_id(int id)
 132 {
 133         X509_TRUST tmp;
 134         int idx;
 135         if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 136                                  return id - X509_TRUST_MIN;
 137         tmp.trust = id;
 138         if(!trtable) return -1;
 139         idx = sk_X509_TRUST_find(trtable, &tmp);
 140         if(idx == -1) return -1;
 141         return idx + X509_TRUST_COUNT;
 142 }
 143
 144 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
 145                                         char *name, int arg1, void *arg2)
 146 {
 147         int idx;
 148         X509_TRUST *trtmp;
 149         /* This is set according to what we change: application can't set it */
 150         flags &= ~X509_TRUST_DYNAMIC;
 151         /* This will always be set for application modified trust entries */
 152         flags |= X509_TRUST_DYNAMIC_NAME;
 153         /* Get existing entry if any */
 154         idx = X509_TRUST_get_by_id(id);
 155         /* Need a new entry */
 156         if(idx == -1) {
 157                 if(!(trtmp = Malloc(sizeof(X509_TRUST)))) {
 158                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 159                         return 0;
 160                 }
 161                 trtmp->flags = X509_TRUST_DYNAMIC;
 162         } else trtmp = X509_TRUST_get0(idx);
 163
 164         /* Free existing name if dynamic */
 165         if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) Free(trtmp->name);
 166         /* dup supplied name */
 167         if(!(trtmp->name = BUF_strdup(name))) {
 168                 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 169                 return 0;
 170         }
 171         /* Keep the dynamic flag of existing entry */
 172         trtmp->flags &= X509_TRUST_DYNAMIC;
 173         /* Set all other flags */
 174         trtmp->flags |= flags;
 175
 176         trtmp->trust = id;
 177         trtmp->check_trust = ck;
 178         trtmp->arg1 = arg1;
 179         trtmp->arg2 = arg2;
 180
 181         /* If its a new entry manage the dynamic table */
 182         if(idx == -1) {
 183                 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 184                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 185                         return 0;
 186                 }
 187                 if (!sk_X509_TRUST_push(trtable, trtmp)) {
 188                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 189                         return 0;
 190                 }
 191         }
 192         return 1;
 193 }
 194
 195 static void trtable_free(X509_TRUST *p)
 196         {
 197         if(!p) return;
 198         if (p->flags & X509_TRUST_DYNAMIC)
 199                 {
 200                 if (p->flags & X509_TRUST_DYNAMIC_NAME)
 201                         Free(p->name);
 202                 Free(p);
 203                 }
 204         }
 205
 206 void X509_TRUST_cleanup(void)
 207 {
 208         int i;
 209         for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
 210         sk_X509_TRUST_pop_free(trtable, trtable_free);
 211         trtable = NULL;
 212 }
 213
 214 int X509_TRUST_get_flags(X509_TRUST *xp)
 215 {
 216         return xp->flags;
 217 }
 218
 219 char *X509_TRUST_get0_name(X509_TRUST *xp)
 220 {
 221         return xp->name;
 222 }
 223
 224 int X509_TRUST_get_trust(X509_TRUST *xp)
 225 {
 226         return xp->trust;
 227 }
 228
 229 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
 230 {
 231         if(x->aux) return obj_trust(trust->arg1, x, flags);
 232         /* we don't have any trust settings: for compatibility
 233          * we return trusted if it is self signed
 234          */
 235         return trust_compat(trust, x, flags);
 236 }
 237
 238 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
 239 {
 240         X509_check_purpose(x, -1, 0);
 241         if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
 242         else return X509_TRUST_UNTRUSTED;
 243 }
 244
 245 static int obj_trust(int id, X509 *x, int flags)
 246 {
 247         ASN1_OBJECT *obj;
 248         int i;
 249         X509_CERT_AUX *ax;
 250         ax = x->aux;
 251         if(!ax) return X509_TRUST_UNTRUSTED;
 252         if(ax->reject) {
 253                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
 254                         obj = sk_ASN1_OBJECT_value(ax->reject, i);
 255                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
 256                 }
 257         }
 258         if(ax->trust) {
 259                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
 260                         obj = sk_ASN1_OBJECT_value(ax->trust, i);
 261                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
 262                 }
 263         }
 264         return X509_TRUST_UNTRUSTED;
 265 }
 266