source: rtems/cpukit/pppd/chap.c @ 660db8c8

/*
 * 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.
 */

/*
 * TODO:
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>     /* drand48, srand48 */
#include <sys/types.h>
#include <sys/time.h>

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

/*
 * Command-line options.
 */
static option_t chap_option_list[] = {
    { "chap-restart", o_int, &chap[0].timeouttime,
      "Set timeout for CHAP", 0, NULL, 0, 0 },
    { "chap-max-challenge", o_int, &chap[0].max_transmits,
      "Set max #xmits for challenge", 0, NULL, 0, 0 },
    { "chap-interval", o_int, &chap[0].chal_interval,
      "Set interval for rechallenge", 0, NULL, 0, 0 },
#ifdef MSLANMAN
    { "ms-lanman", o_bool, &ms_lanman,
      "Use LanMan passwd when using MS-CHAP", 1, NULL, 0, 0 },
#endif
    { NULL, 0, NULL, NULL, 0,  NULL, 0, 0 }
};

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

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

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

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

/*
 * ChapInit - Initialize a CHAP unit.
 */
static void
ChapInit(
    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(
    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(
    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(
    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 */
        error("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(
    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(
    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(
    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(
    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(
    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(
    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(("ChapInput: rcvd short header."));
        return;
    }
    GETCHAR(code, inp);
    GETCHAR(id, inp);
    GETSHORT(len, inp);
    if (len < CHAP_HEADERLEN) {
        CHAPDEBUG(("ChapInput: rcvd illegal length."));
        return;
    }
    if (len > packet_len) {
        CHAPDEBUG(("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? */
        warn("Unknown CHAP code (%d) received.", code);
        break;
    }
}


/*
 * ChapReceiveChallenge - Receive Challenge and send Response.
 */
static void
ChapReceiveChallenge(
    chap_state *cstate,
    u_char *inp,
    int id,
    int len)
{
    int rchallenge_len;
    u_char *rchallenge;
    int secret_len;
    unsigned char secret[MAXSECRETLEN];
    char rhostname[256];
    MD5_CTX mdContext;
    u_char hash[MD5_SIGNATURE_SIZE];

    if (cstate->clientstate == CHAPCS_CLOSED ||
        cstate->clientstate == CHAPCS_PENDING) {
        CHAPDEBUG(("ChapReceiveChallenge: in state %d", cstate->clientstate));
        return;
    }

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

    GETCHAR(rchallenge_len, inp);
    len -= sizeof (u_char) + rchallenge_len;    /* now name field length */
    if (len < 0) {
        CHAPDEBUG(("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';

    /* Microsoft doesn't send their name back in the PPP packet */
    if (explicit_remote || (remote_name[0] != 0 && rhostname[0] == 0)) {
        strlcpy(rhostname, remote_name, sizeof(rhostname));
        CHAPDEBUG(("ChapReceiveChallenge: using '%q' 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 */
        warn("No CHAP secret found for authenticating us to %q", 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(("unknown digest type %d", cstate->resp_type));
        return;
    }

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


/*
 * ChapReceiveResponse - Receive and process response.
 */
static void
ChapReceiveResponse(
    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;
    unsigned char secret[MAXSECRETLEN];
    u_char hash[MD5_SIGNATURE_SIZE];

    if (cstate->serverstate == CHAPSS_CLOSED ||
        cstate->serverstate == CHAPSS_PENDING) {
        CHAPDEBUG(("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(("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(("ChapReceiveResponse: rcvd short packet."));
        return;
    }

    UNTIMEOUT(ChapChallengeTimeout, cstate);

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

    /*
     * Get secret for authenticating them with us,
     * do the hash ourselves, and compare the result.
     */
    code = CHAP_FAILURE;
    if (!get_secret(cstate->unit, (explicit_remote? remote_name: rhostname),
                    cstate->chal_name, secret, &secret_len, 1)) {
        warn("No CHAP secret found for authenticating %q", 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(("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);
        notice("CHAP peer authentication succeeded for %q", rhostname);

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

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

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

    UNTIMEOUT(ChapResponseTimeout, cstate);

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

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


/*
 * ChapSendChallenge - Send an Authenticate challenge.
 */
static void
ChapSendChallenge(
    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);

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


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

    if (code == CHAP_SUCCESS)
        slprintf(msg, sizeof(msg), "Welcome to %s.", hostname);
    else
        slprintf(msg, sizeof(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);
}

/*
 * 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(
    chap_state *cstate)
{
    int chal_len;
    u_char *ptr = cstate->challenge;
    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(
    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(
    u_char *p,
    int plen,
    void (*printer)(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;
}