text: /*-
   * 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.
   */
  
  /* based on @(#)spx.c	8.1 (Berkeley) 6/4/93 */
  
  #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"
   *
   */
  
  #include <sys/types.h>
  #include <arpa/telnet.h>
  #include <stdio.h>
  #include "gssapi_defs.h"
  #include "k5-platform.h"
  #ifdef	__STDC__
  #include <stdlib.h>
  #endif
  #ifdef	HAVE_STRING_H
  #include <string.h>
  #else
  #include <strings.h>
  #endif
  
  #include <pwd.h>
  #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 */
  
  #ifdef	ENCRYPTION
  static Block	session_key	= { 0 };
  #endif	/* ENCRYPTION */
  static Schedule sched;
  static Block	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(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;
  {
  	Block 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 ... ]\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, (void *)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;
  	Block 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, (void *)"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, (void *)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 ]\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, level)
  	Authenticator *ap;
  	char *name;
  	int level;
  {
  
  	gss_buffer_desc  fullname_buffer, acl_file_buffer;
  	gss_OID          fullname_type;
          char acl_file[MAXPATHLEN], 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 = getpwnam(UserNameRequested);
  	if (pwd == NULL) {
            return(AUTH_USER);   /*  not authenticated  */
          }
  
  	acl_file[sizeof(acl_file) - 1] = '\0';
  	strncpy(acl_file, pwd->pw_dir, sizeof(acl_file) - 1);
  	strncat(acl_file, "/.sphinx", sizeof(acl_file) - 1 - strlen(acl_file));
          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) {
            /* the name buffer comes from telnetd/telnetd{-ktd}.c */
  	  strncpy(name, UserNameRequested, 255);
  	  name[255] = '\0';
  	  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;
  	unsigned int buflen;
  {
  	char lbuf[32];
  	register int i;
  
  	buf[buflen-1] = '\0';		/* make sure its NULL terminated */
  	buflen -= 1;
  
  	switch(data[3]) {
  	case SPX_REJECT:		/* Rejected (reason might follow) */
  		strncpy((char *)buf, " REJECT ", buflen);
  		goto common;
  
  	case SPX_ACCEPT:		/* Accepted (name might follow) */
  		strncpy((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 */
  		strncpy((char *)buf, " AUTH", buflen);
  		goto common2;
  
  	default:
  		snprintf(lbuf, sizeof(lbuf), " %d (unknown)", data[3]);
  		strncpy((char *)buf, lbuf, buflen);
  	common2:
  		BUMP(buf, buflen);
  		for (i = 4; i < cnt; i++) {
  			snprintf(lbuf, sizeof(lbuf), " %d", data[i]);
  			strncpy((char *)buf, lbuf, buflen);
  			BUMP(buf, buflen);
  		}
  		break;
  	}
  }
  #else
  #include "misc-proto.h"
  #endif
  
  #ifdef notdef
  
  prkey(msg, key)
  	char *msg;
  	unsigned char *key;
  {
  	register int i;
  	printf("%s:", msg);
  	for (i = 0; i < 8; i++)
  		printf(" %3d", key[i]);
  	printf("\r\n");
  }
  #endif
  