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chap.c

/*
 * chap.c - Challenge Handshake Authentication Protocol.
 *
 * Copyright (c) 1993 The Australian National 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 the Australian National 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.
 *
 * Copyright (c) 1991 Gregory M. Christy.
 * 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 Gregory M. Christy.  The name of the author 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.
 */

#ifndef lint
static char rcsid[] = "$FreeBSD: src/usr.sbin/pppd/chap.c,v 1.10.52.1 2008/11/25 02:59:29 kensmith Exp $";
#endif

/*
 * TODO:
 */

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <syslog.h>
#include <md5.h>

#include "pppd.h"
#include "chap.h"
#include "md5.h"
#ifdef CHAPMS
#include "chap_ms.h"
#endif

/*
 * Protocol entry points.
 */
static void ChapInit __P((int));
static void ChapLowerUp __P((int));
static void ChapLowerDown __P((int));
static void ChapInput __P((int, u_char *, int));
static void ChapProtocolReject __P((int));
static int  ChapPrintPkt __P((u_char *, int,
                        void (*) __P((void *, char *, ...)), void *));

struct protent chap_protent = {
    PPP_CHAP,
    ChapInit,
    ChapInput,
    ChapProtocolReject,
    ChapLowerUp,
    ChapLowerDown,
    NULL,
    NULL,
    ChapPrintPkt,
    NULL,
    1,
    "CHAP",
    NULL,
    NULL,
    NULL
};

chap_state chap[NUM_PPP];           /* CHAP state; one for each unit */

static void ChapChallengeTimeout __P((void *));
static void ChapResponseTimeout __P((void *));
static void ChapReceiveChallenge __P((chap_state *, u_char *, int, int));
static void ChapRechallenge __P((void *));
static void ChapReceiveResponse __P((chap_state *, u_char *, int, int));
static void ChapReceiveSuccess __P((chap_state *, u_char *, int, int));
static void ChapReceiveFailure __P((chap_state *, u_char *, int, int));
static void ChapSendStatus __P((chap_state *, int));
static void ChapSendChallenge __P((chap_state *));
static void ChapSendResponse __P((chap_state *));
static void ChapGenChallenge __P((chap_state *));

extern double drand48 __P((void));
extern void srand48 __P((long));

/*
 * ChapInit - Initialize a CHAP unit.
 */
static void
ChapInit(unit)
    int unit;
{
    chap_state *cstate = &chap[unit];

    BZERO(cstate, sizeof(*cstate));
    cstate->unit = unit;
    cstate->clientstate = CHAPCS_INITIAL;
    cstate->serverstate = CHAPSS_INITIAL;
    cstate->timeouttime = CHAP_DEFTIMEOUT;
    cstate->max_transmits = CHAP_DEFTRANSMITS;
    /* random number generator is initialized in magic_init */
}


/*
 * ChapAuthWithPeer - Authenticate us with our peer (start client).
 *
 */
void
ChapAuthWithPeer(unit, our_name, digest)
    int unit;
    char *our_name;
    int digest;
{
    chap_state *cstate = &chap[unit];

    cstate->resp_name = our_name;
    cstate->resp_type = digest;

    if (cstate->clientstate == CHAPCS_INITIAL ||
      cstate->clientstate == CHAPCS_PENDING) {
      /* lower layer isn't up - wait until later */
      cstate->clientstate = CHAPCS_PENDING;
      return;
    }

    /*
     * We get here as a result of LCP coming up.
     * So even if CHAP was open before, we will 
     * have to re-authenticate ourselves.
     */
    cstate->clientstate = CHAPCS_LISTEN;
}


/*
 * ChapAuthPeer - Authenticate our peer (start server).
 */
void
ChapAuthPeer(unit, our_name, digest)
    int unit;
    char *our_name;
    int digest;
{
    chap_state *cstate = &chap[unit];
  
    cstate->chal_name = our_name;
    cstate->chal_type = digest;

    if (cstate->serverstate == CHAPSS_INITIAL ||
      cstate->serverstate == CHAPSS_PENDING) {
      /* lower layer isn't up - wait until later */
      cstate->serverstate = CHAPSS_PENDING;
      return;
    }

    ChapGenChallenge(cstate);
    ChapSendChallenge(cstate);            /* crank it up dude! */
    cstate->serverstate = CHAPSS_INITIAL_CHAL;
}


/*
 * ChapChallengeTimeout - Timeout expired on sending challenge.
 */
static void
ChapChallengeTimeout(arg)
    void *arg;
{
    chap_state *cstate = (chap_state *) arg;
  
    /* if we aren't sending challenges, don't worry.  then again we */
    /* probably shouldn't be here either */
    if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
      cstate->serverstate != CHAPSS_RECHALLENGE)
      return;

    if (cstate->chal_transmits >= cstate->max_transmits) {
      /* give up on peer */
      syslog(LOG_ERR, "Peer failed to respond to CHAP challenge");
      cstate->serverstate = CHAPSS_BADAUTH;
      auth_peer_fail(cstate->unit, PPP_CHAP);
      return;
    }

    ChapSendChallenge(cstate);            /* Re-send challenge */
}


/*
 * ChapResponseTimeout - Timeout expired on sending response.
 */
static void
ChapResponseTimeout(arg)
    void *arg;
{
    chap_state *cstate = (chap_state *) arg;

    /* if we aren't sending a response, don't worry. */
    if (cstate->clientstate != CHAPCS_RESPONSE)
      return;

    ChapSendResponse(cstate);       /* re-send response */
}


/*
 * ChapRechallenge - Time to challenge the peer again.
 */
static void
ChapRechallenge(arg)
    void *arg;
{
    chap_state *cstate = (chap_state *) arg;

    /* if we aren't sending a response, don't worry. */
    if (cstate->serverstate != CHAPSS_OPEN)
      return;

    ChapGenChallenge(cstate);
    ChapSendChallenge(cstate);
    cstate->serverstate = CHAPSS_RECHALLENGE;
}


/*
 * ChapLowerUp - The lower layer is up.
 *
 * Start up if we have pending requests.
 */
static void
ChapLowerUp(unit)
    int unit;
{
    chap_state *cstate = &chap[unit];
  
    if (cstate->clientstate == CHAPCS_INITIAL)
      cstate->clientstate = CHAPCS_CLOSED;
    else if (cstate->clientstate == CHAPCS_PENDING)
      cstate->clientstate = CHAPCS_LISTEN;

    if (cstate->serverstate == CHAPSS_INITIAL)
      cstate->serverstate = CHAPSS_CLOSED;
    else if (cstate->serverstate == CHAPSS_PENDING) {
      ChapGenChallenge(cstate);
      ChapSendChallenge(cstate);
      cstate->serverstate = CHAPSS_INITIAL_CHAL;
    }
}


/*
 * ChapLowerDown - The lower layer is down.
 *
 * Cancel all timeouts.
 */
static void
ChapLowerDown(unit)
    int unit;
{
    chap_state *cstate = &chap[unit];
  
    /* Timeout(s) pending?  Cancel if so. */
    if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
      cstate->serverstate == CHAPSS_RECHALLENGE)
      UNTIMEOUT(ChapChallengeTimeout, cstate);
    else if (cstate->serverstate == CHAPSS_OPEN
           && cstate->chal_interval != 0)
      UNTIMEOUT(ChapRechallenge, cstate);
    if (cstate->clientstate == CHAPCS_RESPONSE)
      UNTIMEOUT(ChapResponseTimeout, cstate);

    cstate->clientstate = CHAPCS_INITIAL;
    cstate->serverstate = CHAPSS_INITIAL;
}


/*
 * ChapProtocolReject - Peer doesn't grok CHAP.
 */
static void
ChapProtocolReject(unit)
    int unit;
{
    chap_state *cstate = &chap[unit];

    if (cstate->serverstate != CHAPSS_INITIAL &&
      cstate->serverstate != CHAPSS_CLOSED)
      auth_peer_fail(unit, PPP_CHAP);
    if (cstate->clientstate != CHAPCS_INITIAL &&
      cstate->clientstate != CHAPCS_CLOSED)
      auth_withpeer_fail(unit, PPP_CHAP);
    ChapLowerDown(unit);            /* shutdown chap */
}


/*
 * ChapInput - Input CHAP packet.
 */
static void
ChapInput(unit, inpacket, packet_len)
    int unit;
    u_char *inpacket;
    int packet_len;
{
    chap_state *cstate = &chap[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 (packet_len < CHAP_HEADERLEN) {
      CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short header."));
      return;
    }
    GETCHAR(code, inp);
    GETCHAR(id, inp);
    GETSHORT(len, inp);
    if (len < CHAP_HEADERLEN) {
      CHAPDEBUG((LOG_INFO, "ChapInput: rcvd illegal length."));
      return;
    }
    if (len > packet_len) {
      CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short packet."));
      return;
    }
    len -= CHAP_HEADERLEN;
  
    /*
     * Action depends on code (as in fact it usually does :-).
     */
    switch (code) {
    case CHAP_CHALLENGE:
      ChapReceiveChallenge(cstate, inp, id, len);
      break;
    
    case CHAP_RESPONSE:
      ChapReceiveResponse(cstate, inp, id, len);
      break;
    
    case CHAP_FAILURE:
      ChapReceiveFailure(cstate, inp, id, len);
      break;

    case CHAP_SUCCESS:
      ChapReceiveSuccess(cstate, inp, id, len);
      break;

    default:                        /* Need code reject? */
      syslog(LOG_WARNING, "Unknown CHAP code (%d) received.", code);
      break;
    }
}


/*
 * ChapReceiveChallenge - Receive Challenge and send Response.
 */
static void
ChapReceiveChallenge(cstate, inp, id, len)
    chap_state *cstate;
    u_char *inp;
    int id;
    int len;
{
    int rchallenge_len;
    u_char *rchallenge;
    int secret_len;
    char secret[MAXSECRETLEN];
    char rhostname[256];
    MD5_CTX mdContext;
    u_char hash[MD5_SIGNATURE_SIZE];
 
    CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: Rcvd id %d.", id));
    if (cstate->clientstate == CHAPCS_CLOSED ||
      cstate->clientstate == CHAPCS_PENDING) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: in state %d",
               cstate->clientstate));
      return;
    }

    if (len < 2) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet."));
      return;
    }

    GETCHAR(rchallenge_len, inp);
    len -= sizeof (u_char) + rchallenge_len;    /* now name field length */
    if (len < 0) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet."));
      return;
    }
    rchallenge = inp;
    INCPTR(rchallenge_len, inp);

    if (len >= sizeof(rhostname))
      len = sizeof(rhostname) - 1;
    BCOPY(inp, rhostname, len);
    rhostname[len] = '\000';

    CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: received name field '%s'",
             rhostname));

    /* Microsoft doesn't send their name back in the PPP packet */
    if (remote_name[0] != 0 && (explicit_remote || rhostname[0] == 0)) {
      strncpy(rhostname, remote_name, sizeof(rhostname));
      rhostname[sizeof(rhostname) - 1] = 0;
      CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: using '%s' as remote name",
               rhostname));
    }

    /* get secret for authenticating ourselves with the specified host */
    if (!get_secret(cstate->unit, cstate->resp_name, rhostname,
                secret, &secret_len, 0)) {
      secret_len = 0;         /* assume null secret if can't find one */
      syslog(LOG_WARNING, "No CHAP secret found for authenticating us to %s",
             rhostname);
    }

    /* cancel response send timeout if necessary */
    if (cstate->clientstate == CHAPCS_RESPONSE)
      UNTIMEOUT(ChapResponseTimeout, cstate);

    cstate->resp_id = id;
    cstate->resp_transmits = 0;

    /*  generate MD based on negotiated type */
    switch (cstate->resp_type) { 

    case CHAP_DIGEST_MD5:
      MD5Init(&mdContext);
      MD5Update(&mdContext, &cstate->resp_id, 1);
      MD5Update(&mdContext, secret, secret_len);
      MD5Update(&mdContext, rchallenge, rchallenge_len);
      MD5Final(hash, &mdContext);
      BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
      cstate->resp_length = MD5_SIGNATURE_SIZE;
      break;

#ifdef CHAPMS
    case CHAP_MICROSOFT:
      ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
      break;
#endif

    default:
      CHAPDEBUG((LOG_INFO, "unknown digest type %d", cstate->resp_type));
      return;
    }

    BZERO(secret, sizeof(secret));
    ChapSendResponse(cstate);
}


/*
 * ChapReceiveResponse - Receive and process response.
 */
static void
ChapReceiveResponse(cstate, inp, id, len)
    chap_state *cstate;
    u_char *inp;
    int id;
    int len;
{
    u_char *remmd, remmd_len;
    int secret_len, old_state;
    int code;
    char rhostname[256];
    MD5_CTX mdContext;
    char secret[MAXSECRETLEN];
    u_char hash[MD5_SIGNATURE_SIZE];

    CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: Rcvd id %d.", id));

    if (cstate->serverstate == CHAPSS_CLOSED ||
      cstate->serverstate == CHAPSS_PENDING) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: in state %d",
               cstate->serverstate));
      return;
    }

    if (id != cstate->chal_id)
      return;                 /* doesn't match ID of last challenge */

    /*
     * If we have received a duplicate or bogus Response,
     * we have to send the same answer (Success/Failure)
     * as we did for the first Response we saw.
     */
    if (cstate->serverstate == CHAPSS_OPEN) {
      ChapSendStatus(cstate, CHAP_SUCCESS);
      return;
    }
    if (cstate->serverstate == CHAPSS_BADAUTH) {
      ChapSendStatus(cstate, CHAP_FAILURE);
      return;
    }

    if (len < 2) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet."));
      return;
    }
    GETCHAR(remmd_len, inp);        /* get length of MD */
    remmd = inp;              /* get pointer to MD */
    INCPTR(remmd_len, inp);

    len -= sizeof (u_char) + remmd_len;
    if (len < 0) {
      CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet."));
      return;
    }

    UNTIMEOUT(ChapChallengeTimeout, cstate);

    if (len >= sizeof(rhostname))
      len = sizeof(rhostname) - 1;
    BCOPY(inp, rhostname, len);
    rhostname[len] = '\000';

    CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: received name field: %s",
             rhostname));

    /*
     * Get secret for authenticating them with us,
     * do the hash ourselves, and compare the result.
     */
    code = CHAP_FAILURE;
    if (!get_secret(cstate->unit, rhostname, cstate->chal_name,
               secret, &secret_len, 1)) {
      syslog(LOG_WARNING, "No CHAP secret found for authenticating %s",
             rhostname);
    } else {

      /*  generate MD based on negotiated type */
      switch (cstate->chal_type) { 

      case CHAP_DIGEST_MD5:         /* only MD5 is defined for now */
          if (remmd_len != MD5_SIGNATURE_SIZE)
            break;                  /* it's not even the right length */
          MD5Init(&mdContext);
          MD5Update(&mdContext, &cstate->chal_id, 1);
          MD5Update(&mdContext, secret, secret_len);
          MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
          MD5Final(hash, &mdContext); 

          /* compare local and remote MDs and send the appropriate status */
          if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0)
            code = CHAP_SUCCESS;    /* they are the same! */
          break;

      default:
          CHAPDEBUG((LOG_INFO, "unknown digest type %d", cstate->chal_type));
      }
    }

    BZERO(secret, sizeof(secret));
    ChapSendStatus(cstate, code);

    if (code == CHAP_SUCCESS) {
      old_state = cstate->serverstate;
      cstate->serverstate = CHAPSS_OPEN;
      if (old_state == CHAPSS_INITIAL_CHAL) {
          auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
      }
      if (cstate->chal_interval != 0)
          TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
      syslog(LOG_NOTICE, "CHAP peer authentication succeeded for %s",
             rhostname);

    } else {
      syslog(LOG_ERR, "CHAP peer authentication failed for remote host %s",
             rhostname);
      cstate->serverstate = CHAPSS_BADAUTH;
      auth_peer_fail(cstate->unit, PPP_CHAP);
    }
}

/*
 * ChapReceiveSuccess - Receive Success
 */
static void
ChapReceiveSuccess(cstate, inp, id, len)
    chap_state *cstate;
    u_char *inp;
    u_char id;
    int len;
{

    CHAPDEBUG((LOG_INFO, "ChapReceiveSuccess: Rcvd id %d.", id));

    if (cstate->clientstate == CHAPCS_OPEN)
      /* presumably an answer to a duplicate response */
      return;

    if (cstate->clientstate != CHAPCS_RESPONSE) {
      /* don't know what this is */
      CHAPDEBUG((LOG_INFO, "ChapReceiveSuccess: in state %d\n",
               cstate->clientstate));
      return;
    }

    UNTIMEOUT(ChapResponseTimeout, cstate);

    /*
     * Print message.
     */
    if (len > 0)
      PRINTMSG(inp, len);

    cstate->clientstate = CHAPCS_OPEN;

    auth_withpeer_success(cstate->unit, PPP_CHAP);
}


/*
 * ChapReceiveFailure - Receive failure.
 */
static void
ChapReceiveFailure(cstate, inp, id, len)
    chap_state *cstate;
    u_char *inp;
    u_char id;
    int len;
{
    CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: Rcvd id %d.", id));

    if (cstate->clientstate != CHAPCS_RESPONSE) {
      /* don't know what this is */
      CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: in state %d\n",
               cstate->clientstate));
      return;
    }

    UNTIMEOUT(ChapResponseTimeout, cstate);

    /*
     * Print message.
     */
    if (len > 0)
      PRINTMSG(inp, len);

    syslog(LOG_ERR, "CHAP authentication failed");
    auth_withpeer_fail(cstate->unit, PPP_CHAP);
}


/*
 * ChapSendChallenge - Send an Authenticate challenge.
 */
static void
ChapSendChallenge(cstate)
    chap_state *cstate;
{
    u_char *outp;
    int chal_len, name_len;
    int outlen;

    chal_len = cstate->chal_len;
    name_len = strlen(cstate->chal_name);
    outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
    outp = outpacket_buf;

    MAKEHEADER(outp, PPP_CHAP);           /* paste in a CHAP header */

    PUTCHAR(CHAP_CHALLENGE, outp);
    PUTCHAR(cstate->chal_id, outp);
    PUTSHORT(outlen, outp);

    PUTCHAR(chal_len, outp);        /* put length of challenge */
    BCOPY(cstate->challenge, outp, chal_len);
    INCPTR(chal_len, outp);

    BCOPY(cstate->chal_name, outp, name_len);   /* append hostname */

    output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);
  
    CHAPDEBUG((LOG_INFO, "ChapSendChallenge: Sent id %d.", cstate->chal_id));

    TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
    ++cstate->chal_transmits;
}


/*
 * ChapSendStatus - Send a status response (ack or nak).
 */
static void
ChapSendStatus(cstate, code)
    chap_state *cstate;
    int code;
{
    u_char *outp;
    int outlen, msglen;
    char msg[256];

    if (code == CHAP_SUCCESS)
      sprintf(msg, "Welcome to %s.", hostname);
    else
      sprintf(msg, "I don't like you.  Go 'way.");
    msglen = strlen(msg);

    outlen = CHAP_HEADERLEN + msglen;
    outp = outpacket_buf;

    MAKEHEADER(outp, PPP_CHAP);     /* paste in a header */
  
    PUTCHAR(code, outp);
    PUTCHAR(cstate->chal_id, outp);
    PUTSHORT(outlen, outp);
    BCOPY(msg, outp, msglen);
    output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);
  
    CHAPDEBUG((LOG_INFO, "ChapSendStatus: Sent code %d, id %d.", code,
             cstate->chal_id));
}

/*
 * ChapGenChallenge is used to generate a pseudo-random challenge string of
 * a pseudo-random length between min_len and max_len.  The challenge
 * string and its length are stored in *cstate, and various other fields of
 * *cstate are initialized.
 */

static void
ChapGenChallenge(cstate)
    chap_state *cstate;
{
    int chal_len;
    u_char *ptr = cstate->challenge;
    unsigned int i;

    /* pick a random challenge length between MIN_CHALLENGE_LENGTH and 
       MAX_CHALLENGE_LENGTH */  
    chal_len =  (unsigned) ((drand48() *
                       (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) +
                      MIN_CHALLENGE_LENGTH);
    cstate->chal_len = chal_len;
    cstate->chal_id = ++cstate->id;
    cstate->chal_transmits = 0;

    /* generate a random string */
    for (i = 0; i < chal_len; i++ )
      *ptr++ = (char) (drand48() * 0xff);
}

/*
 * ChapSendResponse - send a response packet with values as specified
 * in *cstate.
 */
/* ARGSUSED */
static void
ChapSendResponse(cstate)
    chap_state *cstate;
{
    u_char *outp;
    int outlen, md_len, name_len;

    md_len = cstate->resp_length;
    name_len = strlen(cstate->resp_name);
    outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
    outp = outpacket_buf;

    MAKEHEADER(outp, PPP_CHAP);

    PUTCHAR(CHAP_RESPONSE, outp);   /* we are a response */
    PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
    PUTSHORT(outlen, outp);         /* packet length */

    PUTCHAR(md_len, outp);          /* length of MD */
    BCOPY(cstate->response, outp, md_len);      /* copy MD to buffer */
    INCPTR(md_len, outp);

    BCOPY(cstate->resp_name, outp, name_len); /* append our name */

    /* send the packet */
    output(cstate->unit, outpacket_buf, outlen + PPP_HDRLEN);

    cstate->clientstate = CHAPCS_RESPONSE;
    TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
    ++cstate->resp_transmits;
}

/*
 * ChapPrintPkt - print the contents of a CHAP packet.
 */
static char *ChapCodenames[] = {
    "Challenge", "Response", "Success", "Failure"
};

static int
ChapPrintPkt(p, plen, printer, arg)
    u_char *p;
    int plen;
    void (*printer) __P((void *, char *, ...));
    void *arg;
{
    int code, id, len;
    int clen, nlen;
    u_char x;

    if (plen < CHAP_HEADERLEN)
      return 0;
    GETCHAR(code, p);
    GETCHAR(id, p);
    GETSHORT(len, p);
    if (len < CHAP_HEADERLEN || len > plen)
      return 0;

    if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *))
      printer(arg, " %s", ChapCodenames[code-1]);
    else
      printer(arg, " code=0x%x", code);
    printer(arg, " id=0x%x", id);
    len -= CHAP_HEADERLEN;
    switch (code) {
    case CHAP_CHALLENGE:
    case CHAP_RESPONSE:
      if (len < 1)
          break;
      clen = p[0];
      if (len < clen + 1)
          break;
      ++p;
      nlen = len - clen - 1;
      printer(arg, " <");
      for (; clen > 0; --clen) {
          GETCHAR(x, p);
          printer(arg, "%.2x", x);
      }
      printer(arg, ">, name = ");
      print_string((char *)p, nlen, printer, arg);
      break;
    case CHAP_FAILURE:
    case CHAP_SUCCESS:
      printer(arg, " ");
      print_string((char *)p, len, printer, arg);
      break;
    default:
      for (clen = len; clen > 0; --clen) {
          GETCHAR(x, p);
          printer(arg, " %.2x", x);
      }
    }

    return len + CHAP_HEADERLEN;
}

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