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x_crl.c

/* crypto/asn1/x_crl.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include "asn1_locl.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
                        const X509_REVOKED * const *b);
static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);

ASN1_SEQUENCE(X509_REVOKED) = {
      ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
      ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
      ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
} ASN1_SEQUENCE_END(X509_REVOKED)

static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
static int def_crl_lookup(X509_CRL *crl,
            X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer);

static X509_CRL_METHOD int_crl_meth =
      {
      0,
      0,0,
      def_crl_lookup,
      def_crl_verify
      };

static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;

/* The X509_CRL_INFO structure needs a bit of customisation.
 * Since we cache the original encoding the signature wont be affected by
 * reordering of the revoked field.
 */
static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                                                void *exarg)
{
      X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;

      if(!a || !a->revoked) return 1;
      switch(operation) {
            /* Just set cmp function here. We don't sort because that
             * would affect the output of X509_CRL_print().
             */
            case ASN1_OP_D2I_POST:
            (void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
            break;
      }
      return 1;
}


ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
      ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
      ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
      ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
      ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
      ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
      ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
      ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)

/* Set CRL entry issuer according to CRL certificate issuer extension.
 * Check for unhandled critical CRL entry extensions.
 */

static int crl_set_issuers(X509_CRL *crl)
      {

      int i, j;
      GENERAL_NAMES *gens, *gtmp;
      STACK_OF(X509_REVOKED) *revoked;

      revoked = X509_CRL_get_REVOKED(crl);

      gens = NULL;
      for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
            {
            X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
            STACK_OF(X509_EXTENSION) *exts;
            ASN1_ENUMERATED *reason;
            X509_EXTENSION *ext;
            gtmp = X509_REVOKED_get_ext_d2i(rev, 
                                    NID_certificate_issuer,
                                    &j, NULL);
            if (!gtmp && (j != -1))
                  {
                  crl->flags |= EXFLAG_INVALID;
                  return 1;
                  }

            if (gtmp)
                  {
                  gens = gtmp;
                  if (!crl->issuers)
                        {
                        crl->issuers = sk_GENERAL_NAMES_new_null();
                        if (!crl->issuers)
                              return 0;
                        }
                  if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
                        return 0;
                  }
            rev->issuer = gens;

            reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
                                                &j, NULL);
            if (!reason && (j != -1))
                  {
                  crl->flags |= EXFLAG_INVALID;
                  return 1;
                  }

            if (reason)
                  {
                  rev->reason = ASN1_ENUMERATED_get(reason);
                  ASN1_ENUMERATED_free(reason);
                  }
            else
                  rev->reason = CRL_REASON_NONE;      

            /* Check for critical CRL entry extensions */

            exts = rev->extensions;

            for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
                  {
                  ext = sk_X509_EXTENSION_value(exts, j);
                  if (ext->critical > 0)
                        {
                        if (OBJ_obj2nid(ext->object) ==
                              NID_certificate_issuer)
                              continue;
                        crl->flags |= EXFLAG_CRITICAL;
                        break;
                        }
                  }


            }

      return 1;

      }

/* The X509_CRL structure needs a bit of customisation. Cache some extensions
 * and hash of the whole CRL.
 */
static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                                                void *exarg)
      {
      X509_CRL *crl = (X509_CRL *)*pval;
      STACK_OF(X509_EXTENSION) *exts;
      X509_EXTENSION *ext;
      int idx;

      switch(operation)
            {
            case ASN1_OP_NEW_POST:
            crl->idp = NULL;
            crl->akid = NULL;
            crl->flags = 0;
            crl->idp_flags = 0;
            crl->idp_reasons = CRLDP_ALL_REASONS;
            crl->meth = default_crl_method;
            crl->meth_data = NULL;
            crl->issuers = NULL;
            crl->crl_number = NULL;
            crl->base_crl_number = NULL;
            break;

            case ASN1_OP_D2I_POST:
#ifndef OPENSSL_NO_SHA
            X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
#endif
            crl->idp = X509_CRL_get_ext_d2i(crl,
                        NID_issuing_distribution_point, NULL, NULL);
            if (crl->idp)
                  setup_idp(crl, crl->idp);

            crl->akid = X509_CRL_get_ext_d2i(crl,
                        NID_authority_key_identifier, NULL, NULL);      

            crl->crl_number = X509_CRL_get_ext_d2i(crl,
                        NID_crl_number, NULL, NULL);  

            crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
                        NID_delta_crl, NULL, NULL);   
            /* Delta CRLs must have CRL number */
            if (crl->base_crl_number && !crl->crl_number)
                  crl->flags |= EXFLAG_INVALID;

            /* See if we have any unhandled critical CRL extensions and 
             * indicate this in a flag. We only currently handle IDP so
             * anything else critical sets the flag.
             *
             * This code accesses the X509_CRL structure directly:
             * applications shouldn't do this.
             */

            exts = crl->crl->extensions;

            for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
                  {
                  int nid;
                  ext = sk_X509_EXTENSION_value(exts, idx);
                  nid = OBJ_obj2nid(ext->object);
                  if (nid == NID_freshest_crl)
                        crl->flags |= EXFLAG_FRESHEST;
                  if (ext->critical > 0)
                        {
                        /* We handle IDP and deltas */
                        if ((nid == NID_issuing_distribution_point)
                              || (nid == NID_delta_crl))
                              break;;
                        crl->flags |= EXFLAG_CRITICAL;
                        break;
                        }
                  }


            if (!crl_set_issuers(crl))
                  return 0;

            if (crl->meth->crl_init)
                  {
                  if (crl->meth->crl_init(crl) == 0)
                        return 0;
                  }
            break;

            case ASN1_OP_FREE_POST:
            if (crl->meth->crl_free)
                  {
                  if (!crl->meth->crl_free(crl))
                        return 0;
                  }
            if (crl->akid)
                  AUTHORITY_KEYID_free(crl->akid);
            if (crl->idp)
                  ISSUING_DIST_POINT_free(crl->idp);
            ASN1_INTEGER_free(crl->crl_number);
            ASN1_INTEGER_free(crl->base_crl_number);
            sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
            break;
            }
      return 1;
      }

/* Convert IDP into a more convenient form */

static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
      {
      int idp_only = 0;
      /* Set various flags according to IDP */
      crl->idp_flags |= IDP_PRESENT;
      if (idp->onlyuser > 0)
            {
            idp_only++;
            crl->idp_flags |= IDP_ONLYUSER;
            }
      if (idp->onlyCA > 0)
            {
            idp_only++;
            crl->idp_flags |= IDP_ONLYCA;
            }
      if (idp->onlyattr > 0)
            {
            idp_only++;
            crl->idp_flags |= IDP_ONLYATTR;
            }

      if (idp_only > 1)
            crl->idp_flags |= IDP_INVALID;

      if (idp->indirectCRL > 0)
            crl->idp_flags |= IDP_INDIRECT;

      if (idp->onlysomereasons)
            {
            crl->idp_flags |= IDP_REASONS;
            if (idp->onlysomereasons->length > 0)
                  crl->idp_reasons = idp->onlysomereasons->data[0];
            if (idp->onlysomereasons->length > 1)
                  crl->idp_reasons |=
                        (idp->onlysomereasons->data[1] << 8);
            crl->idp_reasons &= CRLDP_ALL_REASONS;
            }

      DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
      }

ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
      ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
      ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
      ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)

IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)

static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
                  const X509_REVOKED * const *b)
      {
      return(ASN1_STRING_cmp(
            (ASN1_STRING *)(*a)->serialNumber,
            (ASN1_STRING *)(*b)->serialNumber));
      }

int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
{
      X509_CRL_INFO *inf;
      inf = crl->crl;
      if(!inf->revoked)
            inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
      if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
            ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
            return 0;
      }
      inf->enc.modified = 1;
      return 1;
}

int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
      {
      if (crl->meth->crl_verify)
            return crl->meth->crl_verify(crl, r);
      return 0;
      }

int X509_CRL_get0_by_serial(X509_CRL *crl,
            X509_REVOKED **ret, ASN1_INTEGER *serial)
      {
      if (crl->meth->crl_lookup)
            return crl->meth->crl_lookup(crl, ret, serial, NULL);
      return 0;
      }

int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
      {
      if (crl->meth->crl_lookup)
            return crl->meth->crl_lookup(crl, ret,
                                    X509_get_serialNumber(x),
                                    X509_get_issuer_name(x));
      return 0;
      }

static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
      {
      return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
            crl->sig_alg, crl->signature,crl->crl,r));
      }

static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
                                    X509_REVOKED *rev)
      {
      int i;

      if (!rev->issuer)
            {
            if (!nm)
                  return 1;
            if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
                  return 1;
            return 0;
            }

      if (!nm)
            nm = X509_CRL_get_issuer(crl);

      for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
            {
            GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
            if (gen->type != GEN_DIRNAME)
                  continue;
            if (!X509_NAME_cmp(nm, gen->d.directoryName))
                  return 1;
            }
      return 0;

      }

static int def_crl_lookup(X509_CRL *crl,
            X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
      {
      X509_REVOKED rtmp, *rev;
      int idx;
      rtmp.serialNumber = serial;
      /* Sort revoked into serial number order if not already sorted.
       * Do this under a lock to avoid race condition.
       */
      if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
            {
            CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
            sk_X509_REVOKED_sort(crl->crl->revoked);
            CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
            }
      idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
      if(idx < 0)
            return 0;
      /* Need to look for matching name */
      for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
            {
            rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
            if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
                  return 0;
            if (crl_revoked_issuer_match(crl, issuer, rev))
                  {
                  if (ret)
                        *ret = rev;
                  if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
                        return 2;
                  return 1;
                  }
            }
      return 0;
      }

void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
      {
      if (meth == NULL)
            default_crl_method = &int_crl_meth;
      else 
            default_crl_method = meth;
      }

X509_CRL_METHOD *X509_CRL_METHOD_new(
      int (*crl_init)(X509_CRL *crl),
      int (*crl_free)(X509_CRL *crl),
      int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
                        ASN1_INTEGER *ser, X509_NAME *issuer),
      int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
      {
      X509_CRL_METHOD *m;
      m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
      if (!m)
            return NULL;
      m->crl_init = crl_init;
      m->crl_free = crl_free;
      m->crl_lookup = crl_lookup;
      m->crl_verify = crl_verify;
      m->flags = X509_CRL_METHOD_DYNAMIC;
      return m;
      }

void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
      {
      if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
            return;
      OPENSSL_free(m);
      }

void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
      {
      crl->meth_data = dat;
      }

void *X509_CRL_get_meth_data(X509_CRL *crl)
      {
      return crl->meth_data;
      }

IMPLEMENT_STACK_OF(X509_REVOKED)
IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
IMPLEMENT_STACK_OF(X509_CRL)
IMPLEMENT_ASN1_SET_OF(X509_CRL)

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