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spx.c

/*-
 * Copyright (c) 1992, 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.
 */

#include <config.h>

RCSID("$Id: spx.c,v 1.17 1999/09/16 20:41:34 assar Exp $");

#ifdef      SPX
/*
 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
 * ALL RIGHTS RESERVED
 *
 * "Digital Equipment Corporation authorizes the reproduction,
 * distribution and modification of this software subject to the following
 * restrictions:
 *
 * 1.  Any partial or whole copy of this software, or any modification
 * thereof, must include this copyright notice in its entirety.
 *
 * 2.  This software is supplied "as is" with no warranty of any kind,
 * expressed or implied, for any purpose, including any warranty of fitness
 * or merchantibility.  DIGITAL assumes no responsibility for the use or
 * reliability of this software, nor promises to provide any form of
 * support for it on any basis.
 *
 * 3.  Distribution of this software is authorized only if no profit or
 * remuneration of any kind is received in exchange for such distribution.
 *
 * 4.  This software produces public key authentication certificates
 * bearing an expiration date established by DIGITAL and RSA Data
 * Security, Inc.  It may cease to generate certificates after the expiration
 * date.  Any modification of this software that changes or defeats
 * the expiration date or its effect is unauthorized.
 *
 * 5.  Software that will renew or extend the expiration date of
 * authentication certificates produced by this software may be obtained
 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
 * 94065, (415)595-8782, or from DIGITAL"
 *
 */

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ARPA_TELNET_H
#include <arpa/telnet.h>
#endif
#include <stdio.h>
#include "gssapi_defs.h"
#include <stdlib.h>
#include <string.h>

#include <pwd.h>
#ifdef SOCKS
#include <socks.h>
#endif

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

extern auth_debug_mode;

static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
                              AUTHTYPE_SPX, };
static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
                              TELQUAL_NAME, };

#define     SPX_AUTH    0           /* Authentication data follows */
#define     SPX_REJECT  1           /* Rejected (reason might follow) */
#define SPX_ACCEPT      2           /* Accepted */

static des_key_schedule sched;
static des_cblock challenge   = { 0 };


/*******************************************************************/

gss_OID_set       actual_mechs;
gss_OID                 actual_mech_type, output_name_type;
int               major_status, status, msg_ctx = 0, new_status;
int               req_flags = 0, ret_flags, lifetime_rec;
gss_cred_id_t           gss_cred_handle;
gss_ctx_id_t            actual_ctxhandle, context_handle;
gss_buffer_desc         output_token, input_token, input_name_buffer;
gss_buffer_desc         status_string;
gss_name_t        desired_targname, src_name;
gss_channel_bindings    input_chan_bindings;
char              lhostname[GSS_C_MAX_PRINTABLE_NAME];
char              targ_printable[GSS_C_MAX_PRINTABLE_NAME];
int               to_addr=0, from_addr=0;
char              *address;
gss_buffer_desc         fullname_buffer;
gss_OID                 fullname_type;
gss_cred_id_t           gss_delegated_cred_handle;

/*******************************************************************/



      static int
Data(ap, type, d, c)
      Authenticator *ap;
      int type;
      void *d;
      int c;
{
      unsigned char *p = str_data + 4;
      unsigned char *cd = (unsigned char *)d;

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

      if (0) {
            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('>', &str_data[2], p - (&str_data[2]));
      return(telnet_net_write(str_data, p - str_data));
}

      int
spx_init(ap, server)
      Authenticator *ap;
      int server;
{
      gss_cred_id_t     tmp_cred_handle;

      if (server) {
            str_data[3] = TELQUAL_REPLY;
            gethostname(lhostname, sizeof(lhostname));
            snprintf (targ_printable, sizeof(targ_printable),
                    "SERVICE:rcmd@%s", lhostname);
            input_name_buffer.length = strlen(targ_printable);
            input_name_buffer.value = targ_printable;
            major_status = gss_import_name(&status,
                              &input_name_buffer,
                              GSS_C_NULL_OID,
                              &desired_targname);
            major_status = gss_acquire_cred(&status,
                              desired_targname,
                              0,
                              GSS_C_NULL_OID_SET,
                              GSS_C_ACCEPT,
                              &tmp_cred_handle,
                              &actual_mechs,
                              &lifetime_rec);
            if (major_status != GSS_S_COMPLETE) return(0);
      } else {
            str_data[3] = TELQUAL_IS;
      }
      return(1);
}

      int
spx_send(ap)
      Authenticator *ap;
{
      des_cblock enckey;
      int r;

      gss_OID     actual_mech_type, output_name_type;
      int   msg_ctx = 0, new_status, status;
      int   req_flags = 0, ret_flags, lifetime_rec, major_status;
      gss_buffer_desc  output_token, input_token, input_name_buffer;
      gss_buffer_desc  output_name_buffer, status_string;
      gss_name_t    desired_targname;
      gss_channel_bindings  input_chan_bindings;
      char targ_printable[GSS_C_MAX_PRINTABLE_NAME];
      int  from_addr=0, to_addr=0, myhostlen, j;
      int  deleg_flag=1, mutual_flag=0, replay_flag=0, seq_flag=0;
      char *address;

      printf("[ Trying SPX ... ]\r\n");
      snprintf (targ_printable, sizeof(targ_printable),
              "SERVICE:rcmd@%s", RemoteHostName);

      input_name_buffer.length = strlen(targ_printable);
      input_name_buffer.value = targ_printable;

      if (!UserNameRequested) {
            return(0);
      }

      major_status = gss_import_name(&status,
                              &input_name_buffer,
                              GSS_C_NULL_OID,
                              &desired_targname);


      major_status = gss_display_name(&status,
                              desired_targname,
                              &output_name_buffer,
                              &output_name_type);

      printf("target is '%s'\n", output_name_buffer.value); fflush(stdout);

      major_status = gss_release_buffer(&status, &output_name_buffer);

      input_chan_bindings = (gss_channel_bindings)
        malloc(sizeof(gss_channel_bindings_desc));

      input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
      input_chan_bindings->initiator_address.length = 4;
      address = (char *) malloc(4);
      input_chan_bindings->initiator_address.value = (char *) address;
      address[0] = ((from_addr & 0xff000000) >> 24);
      address[1] = ((from_addr & 0xff0000) >> 16);
      address[2] = ((from_addr & 0xff00) >> 8);
      address[3] = (from_addr & 0xff);
      input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
      input_chan_bindings->acceptor_address.length = 4;
      address = (char *) malloc(4);
      input_chan_bindings->acceptor_address.value = (char *) address;
      address[0] = ((to_addr & 0xff000000) >> 24);
      address[1] = ((to_addr & 0xff0000) >> 16);
      address[2] = ((to_addr & 0xff00) >> 8);
      address[3] = (to_addr & 0xff);
      input_chan_bindings->application_data.length = 0;

      req_flags = 0;
      if (deleg_flag)  req_flags = req_flags | 1;
      if (mutual_flag) req_flags = req_flags | 2;
      if (replay_flag) req_flags = req_flags | 4;
      if (seq_flag)    req_flags = req_flags | 8;

      major_status = gss_init_sec_context(&status,         /* minor status */
                              GSS_C_NO_CREDENTIAL, /* cred handle */
                              &actual_ctxhandle,   /* ctx handle */
                              desired_targname,    /* target name */
                              GSS_C_NULL_OID,      /* mech type */
                              req_flags,           /* req flags */
                              0,                   /* time req */
                              input_chan_bindings, /* chan binding */
                              GSS_C_NO_BUFFER,     /* input token */
                              &actual_mech_type,   /* actual mech */
                              &output_token,       /* output token */
                              &ret_flags,          /* ret flags */
                              &lifetime_rec);      /* time rec */

      if ((major_status != GSS_S_COMPLETE) &&
          (major_status != GSS_S_CONTINUE_NEEDED)) {
        gss_display_status(&new_status,
                        status,
                        GSS_C_MECH_CODE,
                        GSS_C_NULL_OID,
                        &msg_ctx,
                        &status_string);
        printf("%s\n", status_string.value);
        return(0);
      }

      if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
            return(0);
      }

      if (!Data(ap, SPX_AUTH, output_token.value, output_token.length)) {
            return(0);
      }

      return(1);
}

      void
spx_is(ap, data, cnt)
      Authenticator *ap;
      unsigned char *data;
      int cnt;
{
      Session_Key skey;
      des_cblock datablock;
      int r;

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

            gethostname(lhostname, sizeof(lhostname));

            snprintf(targ_printable, sizeof(targ_printable),
                   "SERVICE:rcmd@%s", lhostname);

            input_name_buffer.length = strlen(targ_printable);
            input_name_buffer.value = targ_printable;

            major_status = gss_import_name(&status,
                              &input_name_buffer,
                              GSS_C_NULL_OID,
                              &desired_targname);

            major_status = gss_acquire_cred(&status,
                              desired_targname,
                              0,
                              GSS_C_NULL_OID_SET,
                              GSS_C_ACCEPT,
                              &gss_cred_handle,
                              &actual_mechs,
                              &lifetime_rec);

            major_status = gss_release_name(&status, desired_targname);

            input_chan_bindings = (gss_channel_bindings)
              malloc(sizeof(gss_channel_bindings_desc));

            input_chan_bindings->initiator_addrtype = GSS_C_AF_INET;
            input_chan_bindings->initiator_address.length = 4;
            address = (char *) malloc(4);
            input_chan_bindings->initiator_address.value = (char *) address;
            address[0] = ((from_addr & 0xff000000) >> 24);
            address[1] = ((from_addr & 0xff0000) >> 16);
            address[2] = ((from_addr & 0xff00) >> 8);
            address[3] = (from_addr & 0xff);
            input_chan_bindings->acceptor_addrtype = GSS_C_AF_INET;
            input_chan_bindings->acceptor_address.length = 4;
            address = (char *) malloc(4);
            input_chan_bindings->acceptor_address.value = (char *) address;
            address[0] = ((to_addr & 0xff000000) >> 24);
            address[1] = ((to_addr & 0xff0000) >> 16);
            address[2] = ((to_addr & 0xff00) >> 8);
            address[3] = (to_addr & 0xff);
            input_chan_bindings->application_data.length = 0;

            major_status = gss_accept_sec_context(&status,
                                    &context_handle,
                                    gss_cred_handle,
                                    &input_token,
                                    input_chan_bindings,
                                    &src_name,
                                    &actual_mech_type,
                                    &output_token,
                                    &ret_flags,
                                    &lifetime_rec,
                                    &gss_delegated_cred_handle);


            if (major_status != GSS_S_COMPLETE) {

              major_status = gss_display_name(&status,
                              src_name,
                              &fullname_buffer,
                              &fullname_type);
                  Data(ap, SPX_REJECT, "auth failed", -1);
                  auth_finished(ap, AUTH_REJECT);
                  return;
            }

            major_status = gss_display_name(&status,
                              src_name,
                              &fullname_buffer,
                              &fullname_type);


            Data(ap, SPX_ACCEPT, output_token.value, output_token.length);
            auth_finished(ap, AUTH_USER);
            break;

      default:
            Data(ap, SPX_REJECT, 0, 0);
            break;
      }
}


      void
spx_reply(ap, data, cnt)
      Authenticator *ap;
      unsigned char *data;
      int cnt;
{
      Session_Key skey;

      if (cnt-- < 1)
            return;
      switch (*data++) {
      case SPX_REJECT:
            if (cnt > 0) {
                  printf("[ SPX refuses authentication because %.*s ]\r\n",
                        cnt, data);
            } else
                  printf("[ SPX refuses authentication ]\r\n");
            auth_send_retry();
            return;
      case SPX_ACCEPT:
            printf("[ SPX accepts you ]\r\n");
            if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
                  /*
                   * Send over the encrypted challenge.
                   */
              input_token.value = (char *) data;
              input_token.length = cnt;

              major_status = gss_init_sec_context(&status, /* minor stat */
                              GSS_C_NO_CREDENTIAL, /* cred handle */
                              &actual_ctxhandle,   /* ctx handle */
                              desired_targname,    /* target name */
                              GSS_C_NULL_OID,      /* mech type */
                              req_flags,           /* req flags */
                              0,                   /* time req */
                              input_chan_bindings, /* chan binding */
                              &input_token,        /* input token */
                              &actual_mech_type,   /* actual mech */
                              &output_token,       /* output token */
                              &ret_flags,          /* ret flags */
                              &lifetime_rec);      /* time rec */

              if (major_status != GSS_S_COMPLETE) {
                gss_display_status(&new_status,
                              status,
                              GSS_C_MECH_CODE,
                              GSS_C_NULL_OID,
                              &msg_ctx,
                              &status_string);
                printf("[ SPX mutual response fails ... '%s' ]\r\n",
                   status_string.value);
                auth_send_retry();
                return;
              }
            }
            auth_finished(ap, AUTH_USER);
            return;

      default:
            return;
      }
}

      int
spx_status(ap, name, name_sz, level)
      Authenticator *ap;
      char *name;
      size_t name_sz;
      int level;
{

      gss_buffer_desc  fullname_buffer, acl_file_buffer;
      gss_OID          fullname_type;
      char acl_file[160], fullname[160];
      int major_status, status = 0;
      struct passwd  *pwd;

      /*
       * hard code fullname to
       *   "SPX:/C=US/O=Digital/OU=LKG/OU=Sphinx/OU=Users/CN=Kannan Alagappan"
       * and acl_file to "~kannan/.sphinx"
       */

      pwd = k_getpwnam(UserNameRequested);
      if (pwd == NULL) {
        return(AUTH_USER);   /*  not authenticated  */
      }

      snprintf (acl_file, sizeof(acl_file),
              "%s/.sphinx", pwd->pw_dir);

      acl_file_buffer.value = acl_file;
      acl_file_buffer.length = strlen(acl_file);

      major_status = gss_display_name(&status,
                              src_name,
                              &fullname_buffer,
                              &fullname_type);

      if (level < AUTH_USER)
            return(level);

      major_status = gss__check_acl(&status, &fullname_buffer,
                              &acl_file_buffer);

      if (major_status == GSS_S_COMPLETE) {
        strlcpy(name, UserNameRequested, name_sz);
        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
spx_printsub(data, cnt, buf, buflen)
      unsigned char *data, *buf;
      int cnt, buflen;
{
      int i;

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

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

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

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

#endif

#ifdef notdef

prkey(msg, key)
      char *msg;
      unsigned char *key;
{
      int i;
      printf("%s:", msg);
      for (i = 0; i < 8; i++)
            printf(" %3d", key[i]);
      printf("\r\n");
}
#endif

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