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

* pap.c - Network Password Authentication Protocol program file.

*

* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.

* portions Copyright (c) 1997 by Global Election Systems Inc.

*

* The authors hereby grant permission to use, copy, modify, distribute,

* and license this software and its documentation for any purpose, provided

* that existing copyright notices are retained in all copies and that this

* notice and the following disclaimer are included verbatim in any

* distributions. No written agreement, license, or royalty fee is required

* for any of the authorized uses.

*

* THIS SOFTWARE IS PROVIDED BY THE 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 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.

*

******************************************************************************

* REVISION HISTORY

*

* 03-01-01 Marc Boucher <marc@mbsi.ca>

*   Ported to lwIP.

* 97-12-12 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.

*   Original.

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

/*

 * upap.c - User/Password Authentication Protocol.

 *

 * Copyright (c) 1989 Carnegie Mellon University.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by Carnegie Mellon University.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

#include "lwip/opt.h"

#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#if PAP_SUPPORT /* don't build if not configured for use in lwipopts.h */

#include "ppp.h"

#include "pppdebug.h"

#include "auth.h"

#include "pap.h"

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

/*** LOCAL FUNCTION DECLARATIONS ***/

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

/*

 * Protocol entry points.

 */

static void upap_init      (int);

static void upap_lowerup   (int);

static void upap_lowerdown (int);

static void upap_input     (int, u_char *, int);

static void upap_protrej   (int);

static void upap_timeout   (void *);

static void upap_reqtimeout(void *);

static void upap_rauthreq  (upap_state *, u_char *, int, int);

static void upap_rauthack  (upap_state *, u_char *, int, int);

static void upap_rauthnak  (upap_state *, u_char *, int, int);

static void upap_sauthreq  (upap_state *);

static void upap_sresp     (upap_state *, u_char, u_char, char *, int);

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

/*** PUBLIC DATA STRUCTURES ***/

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

struct protent pap_protent = {

  PPP_PAP,

  upap_init,

  upap_input,

  upap_protrej,

  upap_lowerup,

  upap_lowerdown,

  NULL,

  NULL,

#if 0

  upap_printpkt,

  NULL,

#endif

  1,

  "PAP",

#if 0

  NULL,

  NULL,

  NULL

#endif

};

upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */

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

/*** PUBLIC FUNCTION DEFINITIONS ***/

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

/*

 *  Set the default login name and password for the pap sessions

 */

void

upap_setloginpasswd(int unit, const char *luser, const char *lpassword)

{

  upap_state *u = &upap[unit];

  /* Save the username and password we're given */

  u->us_user = luser;

  u->us_userlen = strlen(luser);

  u->us_passwd = lpassword;

  u->us_passwdlen = strlen(lpassword);

}

/*

 * upap_authwithpeer - Authenticate us with our peer (start client).

 *

 * Set new state and send authenticate's.

 */

void

upap_authwithpeer(int unit, char *user, char *password)

{

  upap_state *u = &upap[unit];

  UPAPDEBUG((LOG_INFO, "upap_authwithpeer: %d user=%s password=%s s=%d\n",

             unit, user, password, u->us_clientstate));

  upap_setloginpasswd(unit, user, password);

  u->us_transmits = 0;

  /* Lower layer up yet? */

  if (u->us_clientstate == UPAPCS_INITIAL ||

      u->us_clientstate == UPAPCS_PENDING) {

    u->us_clientstate = UPAPCS_PENDING;

    return;

  }

  upap_sauthreq(u);      /* Start protocol */

}

/*

 * upap_authpeer - Authenticate our peer (start server).

 *

 * Set new state.

 */

void

upap_authpeer(int unit)

{

  upap_state *u = &upap[unit];

  /* Lower layer up yet? */

  if (u->us_serverstate == UPAPSS_INITIAL ||

      u->us_serverstate == UPAPSS_PENDING) {

    u->us_serverstate = UPAPSS_PENDING;

    return;

  }

  u->us_serverstate = UPAPSS_LISTEN;

  if (u->us_reqtimeout > 0) {

    TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);

  }

}

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

/*** LOCAL FUNCTION DEFINITIONS ***/

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

/*

 * upap_init - Initialize a UPAP unit.

 */

static void

upap_init(int unit)

{

  upap_state *u = &upap[unit];

  UPAPDEBUG((LOG_INFO, "upap_init: %d\n", unit));

  u->us_unit         = unit;

  u->us_user         = NULL;

  u->us_userlen      = 0;

  u->us_passwd       = NULL;

  u->us_passwdlen    = 0;

  u->us_clientstate  = UPAPCS_INITIAL;

  u->us_serverstate  = UPAPSS_INITIAL;

  u->us_id           = 0;

  u->us_timeouttime  = UPAP_DEFTIMEOUT;

  u->us_maxtransmits = 10;

  u->us_reqtimeout   = UPAP_DEFREQTIME;

}

/*

 * upap_timeout - Retransmission timer for sending auth-reqs expired.

 */

static void

upap_timeout(void *arg)

{

  upap_state *u = (upap_state *) arg;

  UPAPDEBUG((LOG_INFO, "upap_timeout: %d timeout %d expired s=%d\n",

        u->us_unit, u->us_timeouttime, u->us_clientstate));

  if (u->us_clientstate != UPAPCS_AUTHREQ) {

    return;

  }

  if (u->us_transmits >= u->us_maxtransmits) {

    /* give up in disgust */

    UPAPDEBUG((LOG_ERR, "No response to PAP authenticate-requests\n"));

    u->us_clientstate = UPAPCS_BADAUTH;

    auth_withpeer_fail(u->us_unit, PPP_PAP);

    return;

  }

  upap_sauthreq(u);    /* Send Authenticate-Request */

}

/*

 * upap_reqtimeout - Give up waiting for the peer to send an auth-req.

 */

static void

upap_reqtimeout(void *arg)

{

  upap_state *u = (upap_state *) arg;

  if (u->us_serverstate != UPAPSS_LISTEN) {

    return; /* huh?? */

  }

  auth_peer_fail(u->us_unit, PPP_PAP);

  u->us_serverstate = UPAPSS_BADAUTH;

}

/*

 * upap_lowerup - The lower layer is up.

 *

 * Start authenticating if pending.

 */

static void

upap_lowerup(int unit)

{

  upap_state *u = &upap[unit];

  UPAPDEBUG((LOG_INFO, "upap_lowerup: %d s=%d\n", unit, u->us_clientstate));

  if (u->us_clientstate == UPAPCS_INITIAL) {

    u->us_clientstate = UPAPCS_CLOSED;

  } else if (u->us_clientstate == UPAPCS_PENDING) {

    upap_sauthreq(u);  /* send an auth-request */

  }

  if (u->us_serverstate == UPAPSS_INITIAL) {

    u->us_serverstate = UPAPSS_CLOSED;

  } else if (u->us_serverstate == UPAPSS_PENDING) {

    u->us_serverstate = UPAPSS_LISTEN;

    if (u->us_reqtimeout > 0) {

      TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);

    }

  }

}

/*

 * upap_lowerdown - The lower layer is down.

 *

 * Cancel all timeouts.

 */

static void

upap_lowerdown(int unit)

{

  upap_state *u = &upap[unit];

  UPAPDEBUG((LOG_INFO, "upap_lowerdown: %d s=%d\n", unit, u->us_clientstate));

  if (u->us_clientstate == UPAPCS_AUTHREQ) { /* Timeout pending? */

    UNTIMEOUT(upap_timeout, u);    /* Cancel timeout */

  }

  if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0) {

    UNTIMEOUT(upap_reqtimeout, u);

  }

  u->us_clientstate = UPAPCS_INITIAL;

  u->us_serverstate = UPAPSS_INITIAL;

}

/*

 * upap_protrej - Peer doesn't speak this protocol.

 *

 * This shouldn't happen.  In any case, pretend lower layer went down.

 */

static void

upap_protrej(int unit)

{

  upap_state *u = &upap[unit];

  if (u->us_clientstate == UPAPCS_AUTHREQ) {

    UPAPDEBUG((LOG_ERR, "PAP authentication failed due to protocol-reject\n"));

    auth_withpeer_fail(unit, PPP_PAP);

  }

  if (u->us_serverstate == UPAPSS_LISTEN) {

    UPAPDEBUG((LOG_ERR, "PAP authentication of peer failed (protocol-reject)\n"));

    auth_peer_fail(unit, PPP_PAP);

  }

  upap_lowerdown(unit);

}

/*

 * upap_input - Input UPAP packet.

 */

static void

upap_input(int unit, u_char *inpacket, int l)

{

  upap_state *u = &upap[unit];

  u_char *inp;

  u_char code, id;

  int len;

  /*

   * Parse header (code, id and length).

   * If packet too short, drop it.

   */

  inp = inpacket;

  if (l < UPAP_HEADERLEN) {

    UPAPDEBUG((LOG_INFO, "pap_input: rcvd short header.\n"));

    return;

  }

  GETCHAR(code, inp);

  GETCHAR(id, inp);

  GETSHORT(len, inp);

  if (len < UPAP_HEADERLEN) {

    UPAPDEBUG((LOG_INFO, "pap_input: rcvd illegal length.\n"));

    return;

  }

  if (len > l) {

    UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet.\n"));

    return;

  }

  len -= UPAP_HEADERLEN;

  /*

   * Action depends on code.

   */

  switch (code) {

    case UPAP_AUTHREQ:

      upap_rauthreq(u, inp, id, len);

      break;

    case UPAP_AUTHACK:

      upap_rauthack(u, inp, id, len);

      break;

    case UPAP_AUTHNAK:

      upap_rauthnak(u, inp, id, len);

      break;

    default:        /* XXX Need code reject */

      break;

  }

}

/*

 * upap_rauth - Receive Authenticate.

 */

static void

upap_rauthreq(upap_state *u, u_char *inp, int id, int len)

{

  u_char ruserlen, rpasswdlen;

  char *ruser, *rpasswd;

  int retcode;

  char *msg;

  int msglen;

  UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.\n", id));

  if (u->us_serverstate < UPAPSS_LISTEN) {

    return;

  }

  /*

   * If we receive a duplicate authenticate-request, we are

   * supposed to return the same status as for the first request.

   */

  if (u->us_serverstate == UPAPSS_OPEN) {

    upap_sresp(u, UPAP_AUTHACK, id, "", 0);  /* return auth-ack */

    return;

  }

  if (u->us_serverstate == UPAPSS_BADAUTH) {

    upap_sresp(u, UPAP_AUTHNAK, id, "", 0);  /* return auth-nak */

    return;

  }

  /*

   * Parse user/passwd.

   */

  if (len < sizeof (u_char)) {

    UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));

    return;

  }

  GETCHAR(ruserlen, inp);

  len -= sizeof (u_char) + ruserlen + sizeof (u_char);

  if (len < 0) {

    UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));

    return;

  }

  ruser = (char *) inp;

  INCPTR(ruserlen, inp);

  GETCHAR(rpasswdlen, inp);

  if (len < rpasswdlen) {

    UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.\n"));

    return;

  }

  rpasswd = (char *) inp;

  /*

   * Check the username and password given.

   */

  retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd, rpasswdlen, &msg, &msglen);

  BZERO(rpasswd, rpasswdlen);

  upap_sresp(u, retcode, id, msg, msglen);

  if (retcode == UPAP_AUTHACK) {

    u->us_serverstate = UPAPSS_OPEN;

    auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);

  } else {

    u->us_serverstate = UPAPSS_BADAUTH;

    auth_peer_fail(u->us_unit, PPP_PAP);

  }

  if (u->us_reqtimeout > 0) {

    UNTIMEOUT(upap_reqtimeout, u);

  }

}

/*

 * upap_rauthack - Receive Authenticate-Ack.

 */

static void

upap_rauthack(upap_state *u, u_char *inp, int id, int len)

{

  u_char msglen;

  char *msg;

  LWIP_UNUSED_ARG(id);

  UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d s=%d\n", id, u->us_clientstate));

  if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */

    return;

  }

  /*

   * Parse message.

   */

  if (len < sizeof (u_char)) {

    UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));

    return;

  }

  GETCHAR(msglen, inp);

  len -= sizeof (u_char);

  if (len < msglen) {

    UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.\n"));

    return;

  }

  msg = (char *) inp;

  PRINTMSG(msg, msglen);

  u->us_clientstate = UPAPCS_OPEN;

  auth_withpeer_success(u->us_unit, PPP_PAP);

}

/*

 * upap_rauthnak - Receive Authenticate-Nakk.

 */

static void

upap_rauthnak(upap_state *u, u_char *inp, int id, int len)

{

  u_char msglen;

  char *msg;

  LWIP_UNUSED_ARG(id);

  UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d s=%d\n", id, u->us_clientstate));

  if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */

    return;

  }

  /*

   * Parse message.

   */

  if (len < sizeof (u_char)) {

    UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));

    return;

  }

  GETCHAR(msglen, inp);

  len -= sizeof (u_char);

  if (len < msglen) {

    UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.\n"));

    return;

  }

  msg = (char *) inp;

  PRINTMSG(msg, msglen);

  u->us_clientstate = UPAPCS_BADAUTH;

  UPAPDEBUG((LOG_ERR, "PAP authentication failed\n"));

  auth_withpeer_fail(u->us_unit, PPP_PAP);

}

/*

 * upap_sauthreq - Send an Authenticate-Request.

 */

static void

upap_sauthreq(upap_state *u)

{

  u_char *outp;

  int outlen;

  outlen = UPAP_HEADERLEN + 2 * sizeof (u_char)

         + u->us_userlen + u->us_passwdlen;

  outp = outpacket_buf[u->us_unit];

  MAKEHEADER(outp, PPP_PAP);

  PUTCHAR(UPAP_AUTHREQ, outp);

  PUTCHAR(++u->us_id, outp);

  PUTSHORT(outlen, outp);

  PUTCHAR(u->us_userlen, outp);

  BCOPY(u->us_user, outp, u->us_userlen);

  INCPTR(u->us_userlen, outp);

  PUTCHAR(u->us_passwdlen, outp);

  BCOPY(u->us_passwd, outp, u->us_passwdlen);

  pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);

  UPAPDEBUG((LOG_INFO, "pap_sauth: Sent id %d\n", u->us_id));

  TIMEOUT(upap_timeout, u, u->us_timeouttime);

  ++u->us_transmits;

  u->us_clientstate = UPAPCS_AUTHREQ;

}

/*

 * upap_sresp - Send a response (ack or nak).

 */

static void

upap_sresp(upap_state *u, u_char code, u_char id, char *msg, int msglen)

{

  u_char *outp;

  int outlen;

  outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;

  outp = outpacket_buf[u->us_unit];

  MAKEHEADER(outp, PPP_PAP);

  PUTCHAR(code, outp);

  PUTCHAR(id, outp);

  PUTSHORT(outlen, outp);

  PUTCHAR(msglen, outp);

  BCOPY(msg, outp, msglen);

  pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);

  UPAPDEBUG((LOG_INFO, "pap_sresp: Sent code %d, id %d s=%d\n", code, id, u->us_clientstate));

}

#if 0

/*

 * upap_printpkt - print the contents of a PAP packet.

 */

static int upap_printpkt(

  u_char *p,

  int plen,

  void (*printer) (void *, char *, ...),

  void *arg

)

{

  LWIP_UNUSED_ARG(p);

  LWIP_UNUSED_ARG(plen);

  LWIP_UNUSED_ARG(printer);

  LWIP_UNUSED_ARG(arg);

  return 0;

}

#endif /* 0 */

#endif /* PAP_SUPPORT */

#endif /* PPP_SUPPORT */