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x509_trs.c

/* x509_trs.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509v3.h>


static int tr_cmp(const X509_TRUST * const *a,
            const X509_TRUST * const *b);
static void trtable_free(X509_TRUST *p);

static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
static int trust_compat(X509_TRUST *trust, X509 *x, int flags);

static int obj_trust(int id, X509 *x, int flags);
static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;

/* WARNING: the following table should be kept in order of trust
 * and without any gaps so we can just subtract the minimum trust
 * value to get an index into the table
 */

static X509_TRUST trstandard[] = {
{X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
{X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
{X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth, NULL},
{X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
{X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL},
{X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL},
{X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL}
};

#define X509_TRUST_COUNT      (sizeof(trstandard)/sizeof(X509_TRUST))

IMPLEMENT_STACK_OF(X509_TRUST)

static STACK_OF(X509_TRUST) *trtable = NULL;

static int tr_cmp(const X509_TRUST * const *a,
            const X509_TRUST * const *b)
{
      return (*a)->trust - (*b)->trust;
}

int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
{
      int (*oldtrust)(int , X509 *, int);
      oldtrust = default_trust;
      default_trust = trust;
      return oldtrust;
}


int X509_check_trust(X509 *x, int id, int flags)
{
      X509_TRUST *pt;
      int idx;
      if(id == -1) return 1;
      idx = X509_TRUST_get_by_id(id);
      if(idx == -1) return default_trust(id, x, flags);
      pt = X509_TRUST_get0(idx);
      return pt->check_trust(pt, x, flags);
}

int X509_TRUST_get_count(void)
{
      if(!trtable) return X509_TRUST_COUNT;
      return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
}

X509_TRUST * X509_TRUST_get0(int idx)
{
      if(idx < 0) return NULL;
      if(idx < (int)X509_TRUST_COUNT) return trstandard + idx;
      return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
}

int X509_TRUST_get_by_id(int id)
{
      X509_TRUST tmp;
      int idx;
      if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
                         return id - X509_TRUST_MIN;
      tmp.trust = id;
      if(!trtable) return -1;
      idx = sk_X509_TRUST_find(trtable, &tmp);
      if(idx == -1) return -1;
      return idx + X509_TRUST_COUNT;
}

int X509_TRUST_set(int *t, int trust)
{
      if(X509_TRUST_get_by_id(trust) == -1) {
            X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
            return 0;
      }
      *t = trust;
      return 1;
}

int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
                              char *name, int arg1, void *arg2)
{
      int idx;
      X509_TRUST *trtmp;
      /* This is set according to what we change: application can't set it */
      flags &= ~X509_TRUST_DYNAMIC;
      /* This will always be set for application modified trust entries */
      flags |= X509_TRUST_DYNAMIC_NAME;
      /* Get existing entry if any */
      idx = X509_TRUST_get_by_id(id);
      /* Need a new entry */
      if(idx == -1) {
            if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
                  X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
                  return 0;
            }
            trtmp->flags = X509_TRUST_DYNAMIC;
      } else trtmp = X509_TRUST_get0(idx);

      /* OPENSSL_free existing name if dynamic */
      if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name);
      /* dup supplied name */
      if(!(trtmp->name = BUF_strdup(name))) {
            X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
            return 0;
      }
      /* Keep the dynamic flag of existing entry */
      trtmp->flags &= X509_TRUST_DYNAMIC;
      /* Set all other flags */
      trtmp->flags |= flags;

      trtmp->trust = id;
      trtmp->check_trust = ck;
      trtmp->arg1 = arg1;
      trtmp->arg2 = arg2;

      /* If its a new entry manage the dynamic table */
      if(idx == -1) {
            if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
                  X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
                  return 0;
            }
            if (!sk_X509_TRUST_push(trtable, trtmp)) {
                  X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
                  return 0;
            }
      }
      return 1;
}

static void trtable_free(X509_TRUST *p)
      {
      if(!p) return;
      if (p->flags & X509_TRUST_DYNAMIC) 
            {
            if (p->flags & X509_TRUST_DYNAMIC_NAME)
                  OPENSSL_free(p->name);
            OPENSSL_free(p);
            }
      }

void X509_TRUST_cleanup(void)
{
      unsigned int i;
      for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
      sk_X509_TRUST_pop_free(trtable, trtable_free);
      trtable = NULL;
}

int X509_TRUST_get_flags(X509_TRUST *xp)
{
      return xp->flags;
}

char *X509_TRUST_get0_name(X509_TRUST *xp)
{
      return xp->name;
}

int X509_TRUST_get_trust(X509_TRUST *xp)
{
      return xp->trust;
}

static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
{
      if(x->aux && (x->aux->trust || x->aux->reject))
            return obj_trust(trust->arg1, x, flags);
      /* we don't have any trust settings: for compatibility
       * we return trusted if it is self signed
       */
      return trust_compat(trust, x, flags);
}

static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
{
      if(x->aux) return obj_trust(trust->arg1, x, flags);
      return X509_TRUST_UNTRUSTED;
}

static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
{
      X509_check_purpose(x, -1, 0);
      if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
      else return X509_TRUST_UNTRUSTED;
}

static int obj_trust(int id, X509 *x, int flags)
{
      ASN1_OBJECT *obj;
      int i;
      X509_CERT_AUX *ax;
      ax = x->aux;
      if(!ax) return X509_TRUST_UNTRUSTED;
      if(ax->reject) {
            for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
                  obj = sk_ASN1_OBJECT_value(ax->reject, i);
                  if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
            }
      }     
      if(ax->trust) {
            for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
                  obj = sk_ASN1_OBJECT_value(ax->trust, i);
                  if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
            }
      }
      return X509_TRUST_UNTRUSTED;
}


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