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_1oid(X509_TRUST *trust, X509 *x, int flags);
  70 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
  71
  72 static int obj_trust(int id, X509 *x, int flags);
  73 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;
  74
  75 /* WARNING: the following table should be kept in order of trust
  76  * and without any gaps so we can just subtract the minimum trust
  77  * value to get an index into the table
  78  */
  79
  80 static X509_TRUST trstandard[] = {
  81 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
  82 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
  83 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Client", NID_server_auth, NULL},
  84 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
  85 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL},
  86 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL}
  87 };
  88
  89 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  90
  91 IMPLEMENT_STACK_OF(X509_TRUST)
  92
  93 static STACK_OF(X509_TRUST) *trtable = NULL;
  94
  95 static int tr_cmp(const X509_TRUST * const *a,
  96                 const X509_TRUST * const *b)
  97 {
  98         return (*a)->trust - (*b)->trust;
  99 }
 100
 101 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
 102 {
 103         int (*oldtrust)(int , X509 *, int);
 104         oldtrust = default_trust;
 105         default_trust = trust;
 106         return oldtrust;
 107 }
 108
 109
 110 int X509_check_trust(X509 *x, int id, int flags)
 111 {
 112         X509_TRUST *pt;
 113         int idx;
 114         if(id == -1) return 1;
 115         idx = X509_TRUST_get_by_id(id);
 116         if(idx == -1) return default_trust(id, x, flags);
 117         pt = X509_TRUST_get0(idx);
 118         return pt->check_trust(pt, x, flags);
 119 }
 120
 121 int X509_TRUST_get_count(void)
 122 {
 123         if(!trtable) return X509_TRUST_COUNT;
 124         return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 125 }
 126
 127 X509_TRUST * X509_TRUST_get0(int idx)
 128 {
 129         if(idx < 0) return NULL;
 130         if(idx < X509_TRUST_COUNT) return trstandard + idx;
 131         return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 132 }
 133
 134 int X509_TRUST_get_by_id(int id)
 135 {
 136         X509_TRUST tmp;
 137         int idx;
 138         if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 139                                  return id - X509_TRUST_MIN;
 140         tmp.trust = id;
 141         if(!trtable) return -1;
 142         idx = sk_X509_TRUST_find(trtable, &tmp);
 143         if(idx == -1) return -1;
 144         return idx + X509_TRUST_COUNT;
 145 }
 146
 147 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
 148                                         char *name, int arg1, void *arg2)
 149 {
 150         int idx;
 151         X509_TRUST *trtmp;
 152         /* This is set according to what we change: application can't set it */
 153         flags &= ~X509_TRUST_DYNAMIC;
 154         /* This will always be set for application modified trust entries */
 155         flags |= X509_TRUST_DYNAMIC_NAME;
 156         /* Get existing entry if any */
 157         idx = X509_TRUST_get_by_id(id);
 158         /* Need a new entry */
 159         if(idx == -1) {
 160                 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
 161                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 162                         return 0;
 163                 }
 164                 trtmp->flags = X509_TRUST_DYNAMIC;
 165         } else trtmp = X509_TRUST_get0(idx);
 166
 167         /* OPENSSL_free existing name if dynamic */
 168         if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name);
 169         /* dup supplied name */
 170         if(!(trtmp->name = BUF_strdup(name))) {
 171                 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 172                 return 0;
 173         }
 174         /* Keep the dynamic flag of existing entry */
 175         trtmp->flags &= X509_TRUST_DYNAMIC;
 176         /* Set all other flags */
 177         trtmp->flags |= flags;
 178
 179         trtmp->trust = id;
 180         trtmp->check_trust = ck;
 181         trtmp->arg1 = arg1;
 182         trtmp->arg2 = arg2;
 183
 184         /* If its a new entry manage the dynamic table */
 185         if(idx == -1) {
 186                 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 187                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 188                         return 0;
 189                 }
 190                 if (!sk_X509_TRUST_push(trtable, trtmp)) {
 191                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 192                         return 0;
 193                 }
 194         }
 195         return 1;
 196 }
 197
 198 static void trtable_free(X509_TRUST *p)
 199         {
 200         if(!p) return;
 201         if (p->flags & X509_TRUST_DYNAMIC)
 202                 {
 203                 if (p->flags & X509_TRUST_DYNAMIC_NAME)
 204                         OPENSSL_free(p->name);
 205                 OPENSSL_free(p);
 206                 }
 207         }
 208
 209 void X509_TRUST_cleanup(void)
 210 {
 211         int i;
 212         for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
 213         sk_X509_TRUST_pop_free(trtable, trtable_free);
 214         trtable = NULL;
 215 }
 216
 217 int X509_TRUST_get_flags(X509_TRUST *xp)
 218 {
 219         return xp->flags;
 220 }
 221
 222 char *X509_TRUST_get0_name(X509_TRUST *xp)
 223 {
 224         return xp->name;
 225 }
 226
 227 int X509_TRUST_get_trust(X509_TRUST *xp)
 228 {
 229         return xp->trust;
 230 }
 231
 232 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
 233 {
 234         if(x->aux) return obj_trust(trust->arg1, x, flags);
 235         /* we don't have any trust settings: for compatibility
 236          * we return trusted if it is self signed
 237          */
 238         return trust_compat(trust, x, flags);
 239 }
 240
 241 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
 242 {
 243         if(x->aux) return obj_trust(trust->arg1, x, flags);
 244         return X509_TRUST_UNTRUSTED;
 245 }
 246
 247 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
 248 {
 249         X509_check_purpose(x, -1, 0);
 250         if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
 251         else return X509_TRUST_UNTRUSTED;
 252 }
 253
 254 static int obj_trust(int id, X509 *x, int flags)
 255 {
 256         ASN1_OBJECT *obj;
 257         int i;
 258         X509_CERT_AUX *ax;
 259         ax = x->aux;
 260         if(!ax) return X509_TRUST_UNTRUSTED;
 261         if(ax->reject) {
 262                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
 263                         obj = sk_ASN1_OBJECT_value(ax->reject, i);
 264                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
 265                 }
 266         }
 267         if(ax->trust) {
 268                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
 269                         obj = sk_ASN1_OBJECT_value(ax->trust, i);
 270                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
 271                 }
 272         }
 273         return X509_TRUST_UNTRUSTED;
 274 }
 275