crypto/x509/x509_trs.c

   1 /* x509_trs.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 Server", NID_server_auth, NULL},
  84 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
  85 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL},
  86 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL},
  87 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL},
  88 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
  89 };
  90
  91 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  92
  93 IMPLEMENT_STACK_OF(X509_TRUST)
  94
  95 static STACK_OF(X509_TRUST) *trtable = NULL;
  96
  97 static int tr_cmp(const X509_TRUST * const *a,
  98                 const X509_TRUST * const *b)
  99 {
 100         return (*a)->trust - (*b)->trust;
 101 }
 102
 103 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
 104 {
 105         int (*oldtrust)(int , X509 *, int);
 106         oldtrust = default_trust;
 107         default_trust = trust;
 108         return oldtrust;
 109 }
 110
 111
 112 int X509_check_trust(X509 *x, int id, int flags)
 113 {
 114         X509_TRUST *pt;
 115         int idx;
 116         if(id == -1) return 1;
 117         /* We get this as a default value */
 118         if (id == 0)
 119                 {
 120                 int rv;
 121                 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0);
 122                 if (rv != X509_TRUST_UNTRUSTED)
 123                         return rv;
 124                 return trust_compat(NULL, x, 0);
 125                 }
 126         idx = X509_TRUST_get_by_id(id);
 127         if(idx == -1) return default_trust(id, x, flags);
 128         pt = X509_TRUST_get0(idx);
 129         return pt->check_trust(pt, x, flags);
 130 }
 131
 132 int X509_TRUST_get_count(void)
 133 {
 134         if(!trtable) return X509_TRUST_COUNT;
 135         return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 136 }
 137
 138 X509_TRUST * X509_TRUST_get0(int idx)
 139 {
 140         if(idx < 0) return NULL;
 141         if(idx < (int)X509_TRUST_COUNT) return trstandard + idx;
 142         return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 143 }
 144
 145 int X509_TRUST_get_by_id(int id)
 146 {
 147         X509_TRUST tmp;
 148         int idx;
 149         if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 150                                  return id - X509_TRUST_MIN;
 151         tmp.trust = id;
 152         if(!trtable) return -1;
 153         idx = sk_X509_TRUST_find(trtable, &tmp);
 154         if(idx == -1) return -1;
 155         return idx + X509_TRUST_COUNT;
 156 }
 157
 158 int X509_TRUST_set(int *t, int trust)
 159 {
 160         if(X509_TRUST_get_by_id(trust) == -1) {
 161                 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
 162                 return 0;
 163         }
 164         *t = trust;
 165         return 1;
 166 }
 167
 168 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
 169                                         char *name, int arg1, void *arg2)
 170 {
 171         int idx;
 172         X509_TRUST *trtmp;
 173         /* This is set according to what we change: application can't set it */
 174         flags &= ~X509_TRUST_DYNAMIC;
 175         /* This will always be set for application modified trust entries */
 176         flags |= X509_TRUST_DYNAMIC_NAME;
 177         /* Get existing entry if any */
 178         idx = X509_TRUST_get_by_id(id);
 179         /* Need a new entry */
 180         if(idx == -1) {
 181                 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
 182                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 183                         return 0;
 184                 }
 185                 trtmp->flags = X509_TRUST_DYNAMIC;
 186         } else trtmp = X509_TRUST_get0(idx);
 187
 188         /* OPENSSL_free existing name if dynamic */
 189         if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name);
 190         /* dup supplied name */
 191         if(!(trtmp->name = BUF_strdup(name))) {
 192                 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 193                 return 0;
 194         }
 195         /* Keep the dynamic flag of existing entry */
 196         trtmp->flags &= X509_TRUST_DYNAMIC;
 197         /* Set all other flags */
 198         trtmp->flags |= flags;
 199
 200         trtmp->trust = id;
 201         trtmp->check_trust = ck;
 202         trtmp->arg1 = arg1;
 203         trtmp->arg2 = arg2;
 204
 205         /* If its a new entry manage the dynamic table */
 206         if(idx == -1) {
 207                 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 208                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 209                         return 0;
 210                 }
 211                 if (!sk_X509_TRUST_push(trtable, trtmp)) {
 212                         X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
 213                         return 0;
 214                 }
 215         }
 216         return 1;
 217 }
 218
 219 static void trtable_free(X509_TRUST *p)
 220         {
 221         if(!p) return;
 222         if (p->flags & X509_TRUST_DYNAMIC)
 223                 {
 224                 if (p->flags & X509_TRUST_DYNAMIC_NAME)
 225                         OPENSSL_free(p->name);
 226                 OPENSSL_free(p);
 227                 }
 228         }
 229
 230 void X509_TRUST_cleanup(void)
 231 {
 232         unsigned int i;
 233         for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
 234         sk_X509_TRUST_pop_free(trtable, trtable_free);
 235         trtable = NULL;
 236 }
 237
 238 int X509_TRUST_get_flags(X509_TRUST *xp)
 239 {
 240         return xp->flags;
 241 }
 242
 243 char *X509_TRUST_get0_name(X509_TRUST *xp)
 244 {
 245         return xp->name;
 246 }
 247
 248 int X509_TRUST_get_trust(X509_TRUST *xp)
 249 {
 250         return xp->trust;
 251 }
 252
 253 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
 254 {
 255         if(x->aux && (x->aux->trust || x->aux->reject))
 256                 return obj_trust(trust->arg1, x, flags);
 257         /* we don't have any trust settings: for compatibility
 258          * we return trusted if it is self signed
 259          */
 260         return trust_compat(trust, x, flags);
 261 }
 262
 263 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
 264 {
 265         if(x->aux) return obj_trust(trust->arg1, x, flags);
 266         return X509_TRUST_UNTRUSTED;
 267 }
 268
 269 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
 270 {
 271         X509_check_purpose(x, -1, 0);
 272         if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
 273         else return X509_TRUST_UNTRUSTED;
 274 }
 275
 276 static int obj_trust(int id, X509 *x, int flags)
 277 {
 278         ASN1_OBJECT *obj;
 279         int i;
 280         X509_CERT_AUX *ax;
 281         ax = x->aux;
 282         if(!ax) return X509_TRUST_UNTRUSTED;
 283         if(ax->reject) {
 284                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
 285                         obj = sk_ASN1_OBJECT_value(ax->reject, i);
 286                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
 287                 }
 288         }
 289         if(ax->trust) {
 290                 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
 291                         obj = sk_ASN1_OBJECT_value(ax->trust, i);
 292                         if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
 293                 }
 294         }
 295         return X509_TRUST_UNTRUSTED;
 296 }
 297