/*

 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan

 * (Royal Institute of Technology, Stockholm, Sweden).

 * 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. Neither the name of the Institute nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.

 */

#include "krb5_locl.h"

/**

 * Free content of krb5_creds.

 *

 * @param context Kerberos 5 context.

 * @param c krb5_creds to free.

 *

 * @return Returns 0 to indicate success. Otherwise an kerberos et

 * error code is returned, see krb5_get_error_message().

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_free_cred_contents (krb5_context context, krb5_creds *c)

{

    krb5_free_principal (context, c->client);

    c->client = NULL;

    krb5_free_principal (context, c->server);

    c->server = NULL;

    krb5_free_keyblock_contents (context, &c->session);

    krb5_data_free (&c->ticket);

    krb5_data_free (&c->second_ticket);

    free_AuthorizationData (&c->authdata);

    krb5_free_addresses (context, &c->addresses);

    memset(c, 0, sizeof(*c));

    return 0;

}

/**

 * Copy content of krb5_creds.

 *

 * @param context Kerberos 5 context.

 * @param incred source credential

 * @param c destination credential, free with krb5_free_cred_contents().

 *

 * @return Returns 0 to indicate success. Otherwise an kerberos et

 * error code is returned, see krb5_get_error_message().

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_copy_creds_contents (krb5_context context,

        const krb5_creds *incred,

        krb5_creds *c)

{

    krb5_error_code ret;

    memset(c, 0, sizeof(*c));

    ret = krb5_copy_principal (context, incred->client, &c->client);

    if (ret)

  goto fail;

    ret = krb5_copy_principal (context, incred->server, &c->server);

    if (ret)

  goto fail;

    ret = krb5_copy_keyblock_contents (context, &incred->session, &c->session);

    if (ret)

  goto fail;

    c->times = incred->times;

    ret = krb5_data_copy (&c->ticket,

        incred->ticket.data,

        incred->ticket.length);

    if (ret)

  goto fail;

    ret = krb5_data_copy (&c->second_ticket,

        incred->second_ticket.data,

        incred->second_ticket.length);

    if (ret)

  goto fail;

    ret = copy_AuthorizationData(&incred->authdata, &c->authdata);

    if (ret)

  goto fail;

    ret = krb5_copy_addresses (context,

             &incred->addresses,

             &c->addresses);

    if (ret)

  goto fail;

    c->flags = incred->flags;

    return 0;

fail:

    krb5_free_cred_contents (context, c);

    return ret;

}

/**

 * Copy krb5_creds.

 *

 * @param context Kerberos 5 context.

 * @param incred source credential

 * @param outcred destination credential, free with krb5_free_creds().

 *

 * @return Returns 0 to indicate success. Otherwise an kerberos et

 * error code is returned, see krb5_get_error_message().

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_copy_creds (krb5_context context,

     const krb5_creds *incred,

     krb5_creds **outcred)

{

    krb5_creds *c;

    c = calloc(1, sizeof(*c));

    if (c == NULL)

  return krb5_enomem(context);

    *outcred = c;

    return krb5_copy_creds_contents (context, incred, c);

}

/**

 * Free krb5_creds.

 *

 * @param context Kerberos 5 context.

 * @param c krb5_creds to free.

 *

 * @return Returns 0 to indicate success. Otherwise an kerberos et

 * error code is returned, see krb5_get_error_message().

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_free_creds (krb5_context context, krb5_creds *c)

{

    if (c != NULL)

        krb5_free_cred_contents(context, c);

    free(c);

    return 0;

}

/* XXX this do not belong here */

static krb5_boolean

krb5_times_equal(const krb5_times *a, const krb5_times *b)

{

    return a->starttime == b->starttime &&

  a->authtime == b->authtime &&

  a->endtime == b->endtime &&

  a->renew_till == b->renew_till;

}

/**

 * Return TRUE if `mcreds' and `creds' are equal (`whichfields'

 * determines what equal means).

 *

 *

 * The following flags, set in whichfields affects the comparison:

 * - KRB5_TC_MATCH_SRV_NAMEONLY Consider all realms equal when comparing the service principal.

 * - KRB5_TC_MATCH_KEYTYPE Compare enctypes.

 * - KRB5_TC_MATCH_FLAGS_EXACT Make sure that the ticket flags are identical.

 * - KRB5_TC_MATCH_FLAGS Make sure that all ticket flags set in mcreds are also present in creds .

 * - KRB5_TC_MATCH_TIMES_EXACT Compares the ticket times exactly.

 * - KRB5_TC_MATCH_TIMES Compares only the expiration times of the creds.

 * - KRB5_TC_MATCH_AUTHDATA Compares the authdata fields.

 * - KRB5_TC_MATCH_2ND_TKT Compares the second tickets (used by user-to-user authentication).

 * - KRB5_TC_MATCH_IS_SKEY Compares the existence of the second ticket.

 *

 * @param context Kerberos 5 context.

 * @param whichfields which fields to compare.

 * @param mcreds cred to compare with.

 * @param creds cred to compare with.

 *

 * @return return TRUE if mcred and creds are equal, FALSE if not.

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL

krb5_compare_creds(krb5_context context, krb5_flags whichfields,

       const krb5_creds * mcreds, const krb5_creds * creds)

{

    krb5_boolean match = TRUE;

    if (match && mcreds->server) {

  if (whichfields & (KRB5_TC_DONT_MATCH_REALM | KRB5_TC_MATCH_SRV_NAMEONLY))

      match = krb5_principal_compare_any_realm (context, mcreds->server,

                  creds->server);

  else

      match = krb5_principal_compare (context, mcreds->server,

              creds->server);

    }

    if (match && mcreds->client) {

  if(whichfields & KRB5_TC_DONT_MATCH_REALM)

      match = krb5_principal_compare_any_realm (context, mcreds->client,

                  creds->client);

  else

      match = krb5_principal_compare (context, mcreds->client,

              creds->client);

    }

    if (match && (whichfields & KRB5_TC_MATCH_KEYTYPE))

        match = mcreds->session.keytype == creds->session.keytype;

    if (match && (whichfields & KRB5_TC_MATCH_FLAGS_EXACT))

  match = mcreds->flags.i == creds->flags.i;

    if (match && (whichfields & KRB5_TC_MATCH_FLAGS))

  match = (creds->flags.i & mcreds->flags.i) == mcreds->flags.i;

    if (match && (whichfields & KRB5_TC_MATCH_TIMES_EXACT))

  match = krb5_times_equal(&mcreds->times, &creds->times);

    if (match && (whichfields & KRB5_TC_MATCH_TIMES))

  /* compare only expiration times */

  match = (mcreds->times.renew_till <= creds->times.renew_till) &&

      (mcreds->times.endtime <= creds->times.endtime);

    if (match && (whichfields & KRB5_TC_MATCH_AUTHDATA)) {

  unsigned int i;

  if(mcreds->authdata.len != creds->authdata.len)

      match = FALSE;

  else

      for(i = 0; match && i < mcreds->authdata.len; i++)

    match = (mcreds->authdata.val[i].ad_type ==

       creds->authdata.val[i].ad_type) &&

        (krb5_data_cmp(&mcreds->authdata.val[i].ad_data,

           &creds->authdata.val[i].ad_data) == 0);

    }

    if (match && (whichfields & KRB5_TC_MATCH_2ND_TKT))

  match = (krb5_data_cmp(&mcreds->second_ticket, &creds->second_ticket) == 0);

    if (match && (whichfields & KRB5_TC_MATCH_IS_SKEY))

  match = ((mcreds->second_ticket.length == 0) ==

     (creds->second_ticket.length == 0));

    return match;

}

/**

 * Returns the ticket flags for the credentials in creds.

 * See also krb5_ticket_get_flags().

 *

 * @param creds credential to get ticket flags from

 *

 * @return ticket flags

 *

 * @ingroup krb5

 */

KRB5_LIB_FUNCTION unsigned long KRB5_LIB_CALL

krb5_creds_get_ticket_flags(krb5_creds *creds)

{

    return TicketFlags2int(creds->flags.b);

}