chap.c

unix and linux net driver

    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(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];

    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(cstate, inp, id, len)
    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(cstate, inp, id, len)
    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(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);
  
    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)
	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(cstate)
    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(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;
}