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kerberos5.c

/*-
 * Copyright (c) 1991, 1993
 *    The Regents of the University of California.  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 acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

/*
 * Copyright (C) 1990 by the Massachusetts Institute of Technology
 *
 * Export of this software from the United States of America may
 * require a specific license from the United States Government.
 * It is the responsibility of any person or organization contemplating
 * export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#include <config.h>

RCSID("$Id: kerberos5.c,v 1.53.2.1 2004/06/21 08:21:07 lha Exp $");

#ifdef      KRB5

#include <arpa/telnet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <ctype.h>
#include <pwd.h>
#define Authenticator k5_Authenticator
#include <krb5.h>
#undef Authenticator
#include <roken.h>
#ifdef SOCKS
#include <socks.h>
#endif


#include "encrypt.h"
#include "auth.h"
#include "misc.h"

#if defined(DCE)
int dfsk5ok = 0;
int dfspag = 0;
int dfsfwd = 0;
#endif

int forward_flags = 0;  /* Flags get set in telnet/main.c on -f and -F */

int forward(int);
int forwardable(int);

/* These values need to be the same as those defined in telnet/main.c. */
/* Either define them in both places, or put in some common header file. */
#define OPTS_FORWARD_CREDS    0x00000002
#define OPTS_FORWARDABLE_CREDS      0x00000001


void kerberos5_forward (Authenticator *);

static unsigned char str_data[4] = { IAC, SB, TELOPT_AUTHENTICATION, 0 };

#define     KRB_AUTH          0     /* Authentication data follows */
#define     KRB_REJECT        1     /* Rejected (reason might follow) */
#define     KRB_ACCEPT        2     /* Accepted */
#define     KRB_RESPONSE            3     /* Response for mutual auth. */

#define KRB_FORWARD           4       /* Forwarded credentials follow */
#define KRB_FORWARD_ACCEPT          5       /* Forwarded credentials accepted */
#define KRB_FORWARD_REJECT          6       /* Forwarded credentials rejected */

static      krb5_data auth;
static  krb5_ticket *ticket;

static krb5_context context;
static krb5_auth_context auth_context;

static int
Data(Authenticator *ap, int type, void *d, int c)
{
    unsigned char *cd = (unsigned char *)d;
    unsigned char *p0, *p;
    size_t len = sizeof(str_data) + 3 + 2;
    int ret;

    if (c == -1)
      c = strlen((char*)cd);

    for (p = cd; p - cd < c; p++, len++)
      if (*p == IAC)
          len++;

    p0 = malloc(len);
    if (p0 == NULL)
      return 0;
    
    memcpy(p0, str_data, sizeof(str_data));
    p = p0 + sizeof(str_data);
      
    if (auth_debug_mode) {
      printf("%s:%d: [%d] (%d)",
             str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
             str_data[3],
             type, c);
      printd(d, c);
      printf("\r\n");
    }
    *p++ = ap->type;
    *p++ = ap->way;
    *p++ = type;
    while (c-- > 0) {
      if ((*p++ = *cd++) == IAC)
          *p++ = IAC;
    }
    *p++ = IAC;
    *p++ = SE;
    if (str_data[3] == TELQUAL_IS)
      printsub('>', &p0[2], len - 2);
    ret = telnet_net_write(p0, len);
    free(p0);
    return ret;
}

int
kerberos5_init(Authenticator *ap, int server)
{
    krb5_error_code ret;

    ret = krb5_init_context(&context);
    if (ret)
      return 0;
    if (server) {
      krb5_keytab kt;
      krb5_kt_cursor cursor;

      ret = krb5_kt_default(context, &kt);
      if (ret)
          return 0;

      ret = krb5_kt_start_seq_get (context, kt, &cursor);
      if (ret) {
          krb5_kt_close (context, kt);
          return 0;
      }
      krb5_kt_end_seq_get (context, kt, &cursor);
      krb5_kt_close (context, kt);

      str_data[3] = TELQUAL_REPLY;
    } else
      str_data[3] = TELQUAL_IS;
    return(1);
}

extern int net;
static int
kerberos5_send(char *name, Authenticator *ap)
{
    krb5_error_code ret;
    krb5_ccache ccache;
    int ap_opts;
    krb5_data cksum_data;
    char foo[2];
    
    if (!UserNameRequested) {
      if (auth_debug_mode) {
          printf("Kerberos V5: no user name supplied\r\n");
      }
      return(0);
    }
    
    ret = krb5_cc_default(context, &ccache);
    if (ret) {
      if (auth_debug_mode) {
          printf("Kerberos V5: could not get default ccache: %s\r\n",
               krb5_get_err_text (context, ret));
      }
      return 0;
    }
      
    if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
      ap_opts = AP_OPTS_MUTUAL_REQUIRED;
    else
      ap_opts = 0;

    ap_opts |= AP_OPTS_USE_SUBKEY;
    
    ret = krb5_auth_con_init (context, &auth_context);
    if (ret) {
      if (auth_debug_mode) {
          printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
               krb5_get_err_text(context, ret));
      }
      return(0);
    }

    ret = krb5_auth_con_setaddrs_from_fd (context,
                                auth_context,
                                &net);
    if (ret) {
      if (auth_debug_mode) {
          printf ("Kerberos V5:"
                " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
                krb5_get_err_text(context, ret));
      }
      return(0);
    }

    krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);

    foo[0] = ap->type;
    foo[1] = ap->way;

    cksum_data.length = sizeof(foo);
    cksum_data.data   = foo;


    {
      krb5_principal service;
      char sname[128];


      ret = krb5_sname_to_principal (context,
                               RemoteHostName,
                               NULL,
                               KRB5_NT_SRV_HST,
                               &service);
      if(ret) {
          if (auth_debug_mode) {
            printf ("Kerberos V5:"
                  " krb5_sname_to_principal(%s) failed (%s)\r\n",
                  RemoteHostName, krb5_get_err_text(context, ret));
          }
          return 0;
      }
      ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
      if(ret) {
          if (auth_debug_mode) {
            printf ("Kerberos V5:"
                  " krb5_unparse_name_fixed failed (%s)\r\n",
                  krb5_get_err_text(context, ret));
          }
          return 0;
      }
      printf("[ Trying %s (%s)... ]\r\n", name, sname);
      ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
                        service, 
                        &cksum_data, ccache, &auth);
      krb5_free_principal (context, service);

    }
    if (ret) {
      if (1 || auth_debug_mode) {
          printf("Kerberos V5: mk_req failed (%s)\r\n",
               krb5_get_err_text(context, ret));
      }
      return(0);
    }

    if (!auth_sendname((unsigned char *)UserNameRequested,
                   strlen(UserNameRequested))) {
      if (auth_debug_mode)
          printf("Not enough room for user name\r\n");
      return(0);
    }
    if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
      if (auth_debug_mode)
          printf("Not enough room for authentication data\r\n");
      return(0);
    }
    if (auth_debug_mode) {
      printf("Sent Kerberos V5 credentials to server\r\n");
    }
    return(1);
}

int
kerberos5_send_mutual(Authenticator *ap)
{
    return kerberos5_send("mutual KERBEROS5", ap);
}

int
kerberos5_send_oneway(Authenticator *ap)
{
    return kerberos5_send("KERBEROS5", ap);
}

void
kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
{
    krb5_error_code ret;
    krb5_data outbuf;
    krb5_keyblock *key_block;
    char *name;
    krb5_principal server;
    int zero = 0;

    if (cnt-- < 1)
      return;
    switch (*data++) {
    case KRB_AUTH:
      auth.data = (char *)data;
      auth.length = cnt;

      auth_context = NULL;

      ret = krb5_auth_con_init (context, &auth_context);
      if (ret) {
          Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
                   krb5_get_err_text(context, ret));
          return;
      }

      ret = krb5_auth_con_setaddrs_from_fd (context,
                                    auth_context,
                                    &zero);
      if (ret) {
          Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: "
                   "krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
                   krb5_get_err_text(context, ret));
          return;
      }

      ret = krb5_sock_to_principal (context,
                              0,
                              "host",
                              KRB5_NT_SRV_HST,
                              &server);
      if (ret) {
          Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: "
                   "krb5_sock_to_principal failed (%s)\r\n",
                   krb5_get_err_text(context, ret));
          return;
      }

      ret = krb5_rd_req(context,
                    &auth_context,
                    &auth, 
                    server,
                    NULL,
                    NULL,
                    &ticket);

      krb5_free_principal (context, server);
      if (ret) {
          char *errbuf;

          asprintf(&errbuf,
                 "Read req failed: %s",
                 krb5_get_err_text(context, ret));
          Data(ap, KRB_REJECT, errbuf, -1);
          if (auth_debug_mode)
            printf("%s\r\n", errbuf);
          free (errbuf);
          return;
      }
      
      {
          char foo[2];
          
          foo[0] = ap->type;
          foo[1] = ap->way;
          
          ret = krb5_verify_authenticator_checksum(context,
                                         auth_context,
                                         foo, 
                                         sizeof(foo));

          if (ret) {
            char *errbuf;
            asprintf(&errbuf, "Bad checksum: %s", 
                   krb5_get_err_text(context, ret));
            Data(ap, KRB_REJECT, errbuf, -1);
            if (auth_debug_mode)
                printf ("%s\r\n", errbuf);
            free(errbuf);
            return;
          }
      }
      ret = krb5_auth_con_getremotesubkey (context,
                                   auth_context,
                                   &key_block);

      if (ret) {
          Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: "
                   "krb5_auth_con_getremotesubkey failed (%s)\r\n",
                   krb5_get_err_text(context, ret));
          return;
      }

      if (key_block == NULL) {
          ret = krb5_auth_con_getkey(context,
                               auth_context,
                               &key_block);
      }
      if (ret) {
          Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: "
                   "krb5_auth_con_getkey failed (%s)\r\n",
                   krb5_get_err_text(context, ret));
          return;
      }
      if (key_block == NULL) {
          Data(ap, KRB_REJECT, "no subkey received", -1);
          auth_finished(ap, AUTH_REJECT);
          if (auth_debug_mode)
            printf("Kerberos V5: "
                   "krb5_auth_con_getremotesubkey returned NULL key\r\n");
          return;
      }

      if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
          ret = krb5_mk_rep(context, auth_context, &outbuf);
          if (ret) {
            Data(ap, KRB_REJECT,
                 "krb5_mk_rep failed", -1);
            auth_finished(ap, AUTH_REJECT);
            if (auth_debug_mode)
                printf("Kerberos V5: "
                     "krb5_mk_rep failed (%s)\r\n",
                     krb5_get_err_text(context, ret));
            return;
          }
          Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
      }
      if (krb5_unparse_name(context, ticket->client, &name))
          name = 0;

      if(UserNameRequested && krb5_kuserok(context,
                                   ticket->client,
                                   UserNameRequested)) {
          Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
          if (auth_debug_mode) {
            printf("Kerberos5 identifies him as ``%s''\r\n",
                   name ? name : "");
          }

          if(key_block->keytype == ETYPE_DES_CBC_MD5 ||
             key_block->keytype == ETYPE_DES_CBC_MD4 ||
             key_block->keytype == ETYPE_DES_CBC_CRC) {
            Session_Key skey;

            skey.type = SK_DES;
            skey.length = 8;
            skey.data = key_block->keyvalue.data;
            encrypt_session_key(&skey, 0);
          }

      } else {
          char *msg;

          asprintf (&msg, "user `%s' is not authorized to "
                  "login as `%s'", 
                  name ? name : "<unknown>",
                  UserNameRequested ? UserNameRequested : "<nobody>");
          if (msg == NULL)
            Data(ap, KRB_REJECT, NULL, 0);
          else {
            Data(ap, KRB_REJECT, (void *)msg, -1);
            free(msg);
          }
          auth_finished (ap, AUTH_REJECT);
          krb5_free_keyblock_contents(context, key_block);
          break;
      }
      auth_finished(ap, AUTH_USER);
      krb5_free_keyblock_contents(context, key_block);
      
      break;
    case KRB_FORWARD: {
      struct passwd *pwd;
      char ccname[1024];      /* XXX */
      krb5_data inbuf;
      krb5_ccache ccache;
      inbuf.data = (char *)data;
      inbuf.length = cnt;

      pwd = getpwnam (UserNameRequested);
      if (pwd == NULL)
          break;

      snprintf (ccname, sizeof(ccname),
              "FILE:/tmp/krb5cc_%u", pwd->pw_uid);

      ret = krb5_cc_resolve (context, ccname, &ccache);
      if (ret) {
          if (auth_debug_mode)
            printf ("Kerberos V5: could not get ccache: %s\r\n",
                  krb5_get_err_text(context, ret));
          break;
      }

      ret = krb5_cc_initialize (context,
                          ccache,
                          ticket->client);
      if (ret) {
          if (auth_debug_mode)
            printf ("Kerberos V5: could not init ccache: %s\r\n",
                  krb5_get_err_text(context, ret));
          break;
      }

#if defined(DCE)
      esetenv("KRB5CCNAME", ccname, 1);
#endif
      ret = krb5_rd_cred2 (context,
                       auth_context,
                       ccache,
                       &inbuf);
      if(ret) {
          char *errbuf;

          asprintf (&errbuf,
                  "Read forwarded creds failed: %s",
                  krb5_get_err_text (context, ret));
          if(errbuf == NULL)
            Data(ap, KRB_FORWARD_REJECT, NULL, 0);
          else
            Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
          if (auth_debug_mode)
            printf("Could not read forwarded credentials: %s\r\n",
                   errbuf);
          free (errbuf);
      } else {
          Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
#if defined(DCE)
          dfsfwd = 1;
#endif
      }
      chown (ccname + 5, pwd->pw_uid, -1);
      if (auth_debug_mode)
          printf("Forwarded credentials obtained\r\n");
      break;
    }
    default:
      if (auth_debug_mode)
          printf("Unknown Kerberos option %d\r\n", data[-1]);
      Data(ap, KRB_REJECT, 0, 0);
      break;
    }
}

void
kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt)
{
    static int mutual_complete = 0;

    if (cnt-- < 1)
      return;
    switch (*data++) {
    case KRB_REJECT:
      if (cnt > 0) {
          printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
               cnt, data);
      } else
          printf("[ Kerberos V5 refuses authentication ]\r\n");
      auth_send_retry();
      return;
    case KRB_ACCEPT: {
      krb5_error_code ret;
      Session_Key skey;
      krb5_keyblock *keyblock;
      
      if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL &&
          !mutual_complete) {
          printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
          auth_send_retry();
          return;
      }
      if (cnt)
          printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
      else
          printf("[ Kerberos V5 accepts you ]\r\n");
            
      ret = krb5_auth_con_getlocalsubkey (context,
                                  auth_context,
                                  &keyblock);
      if (ret)
          ret = krb5_auth_con_getkey (context,
                              auth_context,
                              &keyblock);
      if(ret) {
          printf("[ krb5_auth_con_getkey: %s ]\r\n",
               krb5_get_err_text(context, ret));
          auth_send_retry();
          return;
      }
            
      skey.type = SK_DES;
      skey.length = 8;
      skey.data = keyblock->keyvalue.data;
      encrypt_session_key(&skey, 0);
      krb5_free_keyblock_contents (context, keyblock);
      auth_finished(ap, AUTH_USER);
      if (forward_flags & OPTS_FORWARD_CREDS)
          kerberos5_forward(ap);
      break;
    }
    case KRB_RESPONSE:
      if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
          /* the rest of the reply should contain a krb_ap_rep */
        krb5_ap_rep_enc_part *reply;
        krb5_data inbuf;
        krb5_error_code ret;
          
        inbuf.length = cnt;
        inbuf.data = (char *)data;

        ret = krb5_rd_rep(context, auth_context, &inbuf, &reply);
        if (ret) {
            printf("[ Mutual authentication failed: %s ]\r\n",
                 krb5_get_err_text (context, ret));
            auth_send_retry();
            return;
        }
        krb5_free_ap_rep_enc_part(context, reply);
        mutual_complete = 1;
      }
      return;
    case KRB_FORWARD_ACCEPT:
      printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
      return;
    case KRB_FORWARD_REJECT:
      printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
             cnt, data);
      return;
    default:
      if (auth_debug_mode)
          printf("Unknown Kerberos option %d\r\n", data[-1]);
      return;
    }
}

int
kerberos5_status(Authenticator *ap, char *name, size_t name_sz, int level)
{
    if (level < AUTH_USER)
      return(level);

    if (UserNameRequested &&
      krb5_kuserok(context,
                 ticket->client,
                 UserNameRequested))
      {
          strlcpy(name, UserNameRequested, name_sz);
#if defined(DCE)
          dfsk5ok = 1;
#endif
          return(AUTH_VALID);
      } else
          return(AUTH_USER);
}

#define     BUMP(buf, len)          while (*(buf)) {++(buf), --(len);}
#define     ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}

void
kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
{
    int i;

    buf[buflen-1] = '\0';           /* make sure its NULL terminated */
    buflen -= 1;

    switch(data[3]) {
    case KRB_REJECT:          /* Rejected (reason might follow) */
      strlcpy((char *)buf, " REJECT ", buflen);
      goto common;

    case KRB_ACCEPT:          /* Accepted (name might follow) */
      strlcpy((char *)buf, " ACCEPT ", buflen);
    common:
      BUMP(buf, buflen);
      if (cnt <= 4)
          break;
      ADDC(buf, buflen, '"');
      for (i = 4; i < cnt; i++)
          ADDC(buf, buflen, data[i]);
      ADDC(buf, buflen, '"');
      ADDC(buf, buflen, '\0');
      break;


    case KRB_AUTH:                  /* Authentication data follows */
      strlcpy((char *)buf, " AUTH", buflen);
      goto common2;

    case KRB_RESPONSE:
      strlcpy((char *)buf, " RESPONSE", buflen);
      goto common2;

    case KRB_FORWARD:         /* Forwarded credentials follow */
      strlcpy((char *)buf, " FORWARD", buflen);
      goto common2;

    case KRB_FORWARD_ACCEPT:  /* Forwarded credentials accepted */
      strlcpy((char *)buf, " FORWARD_ACCEPT", buflen);
      goto common2;

    case KRB_FORWARD_REJECT:  /* Forwarded credentials rejected */
      /* (reason might follow) */
      strlcpy((char *)buf, " FORWARD_REJECT", buflen);
      goto common2;

    default:
      snprintf((char*)buf, buflen, " %d (unknown)", data[3]);
    common2:
      BUMP(buf, buflen);
      for (i = 4; i < cnt; i++) {
          snprintf((char*)buf, buflen, " %d", data[i]);
          BUMP(buf, buflen);
      }
      break;
    }
}

void
kerberos5_forward(Authenticator *ap)
{
    krb5_error_code ret;
    krb5_ccache     ccache;
    krb5_creds      creds;
    krb5_kdc_flags  flags;
    krb5_data       out_data;
    krb5_principal  principal;

    ret = krb5_cc_default (context, &ccache);
    if (ret) {
      if (auth_debug_mode)
          printf ("KerberosV5: could not get default ccache: %s\r\n",
                krb5_get_err_text (context, ret));
      return;
    }

    ret = krb5_cc_get_principal (context, ccache, &principal);
    if (ret) {
      if (auth_debug_mode)
          printf ("KerberosV5: could not get principal: %s\r\n",
                krb5_get_err_text (context, ret));
      return;
    }

    memset (&creds, 0, sizeof(creds));

    creds.client = principal;
    
    ret = krb5_build_principal (context,
                        &creds.server,
                        strlen(principal->realm),
                        principal->realm,
                        "krbtgt",
                        principal->realm,
                        NULL);

    if (ret) {
      if (auth_debug_mode)
          printf ("KerberosV5: could not get principal: %s\r\n",
                krb5_get_err_text (context, ret));
      return;
    }

    creds.times.endtime = 0;

    flags.i = 0;
    flags.b.forwarded = 1;
    if (forward_flags & OPTS_FORWARDABLE_CREDS)
      flags.b.forwardable = 1;

    ret = krb5_get_forwarded_creds (context,
                            auth_context,
                            ccache,
                            flags.i,
                            RemoteHostName,
                            &creds,
                            &out_data);
    if (ret) {
      if (auth_debug_mode)
          printf ("Kerberos V5: error getting forwarded creds: %s\r\n",
                krb5_get_err_text (context, ret));
      return;
    }

    if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) {
      if (auth_debug_mode)
          printf("Not enough room for authentication data\r\n");
    } else {
      if (auth_debug_mode)
          printf("Forwarded local Kerberos V5 credentials to server\r\n");
    }
}

#if defined(DCE)
/* if this was a K5 authentication try and join a PAG for the user. */
void
kerberos5_dfspag(void)
{
    if (dfsk5ok) {
      dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client,
                        UserNameRequested);
    }
}
#endif

int
kerberos5_set_forward(int on)
{
    if(on == 0)
      forward_flags &= ~OPTS_FORWARD_CREDS;
    if(on == 1)
      forward_flags |= OPTS_FORWARD_CREDS;
    if(on == -1)
      forward_flags ^= OPTS_FORWARD_CREDS;
    return 0;
}

int
kerberos5_set_forwardable(int on)
{
    if(on == 0)
      forward_flags &= ~OPTS_FORWARDABLE_CREDS;
    if(on == 1)
      forward_flags |= OPTS_FORWARDABLE_CREDS;
    if(on == -1)
      forward_flags ^= OPTS_FORWARDABLE_CREDS;
    return 0;
}

#endif /* KRB5 */

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