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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 "ppp.h"

#include "auth.h"

#include "pap.h"

#include "pppdebug.h"

#if PAP_SUPPORT > 0

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

/*** 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;

        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;

        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

)

{

        (void)p;

        (void)plen;

        (void)printer;

        (void)arg;

        return 0;

}

#endif

#endif /* PAP_SUPPORT */