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/*
* 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.
*/
/*
* TODO:
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#ifdef STREAMS
#include <sys/socket.h>
#include <net/if.h>
#include <sys/stream.h>
#endif
#include "ppp.h"
#include "upap.h"
upap_state upap[NPPP]; /* UPAP state; one for each unit */
void upap_timeout(), upap_rauth(), upap_rauthack(), upap_rauthnak();
void upap_sauth(), upap_sresp();
/*
* upap_init - Initialize a UPAP unit.
*/
void upap_init(unit)
int unit;
{
upap_state *u = &upap[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_CLOSED;
u->us_serverstate = UPAPSS_CLOSED;
u->us_flags = 0;
u->us_id = 0;
u->us_timeouttime = UPAP_DEFTIMEOUT;
}
/*
* upap_authwithpeer - Authenticate us with our peer (start client).
*
* Set new state and send authenticate's.
*/
void upap_authwithpeer(unit)
int unit;
{
upap_state *u = &upap[unit];
u->us_flags &= ~UPAPF_AWPPENDING; /* Clear pending flag */
/* Protect against programming errors that compromise security */
if (u->us_serverstate != UPAPSS_CLOSED ||
u->us_flags & UPAPF_APPENDING) {
UPAPDEBUG((stderr,
"ppp: upap_authwithpeer: upap_authpeer already called!\n"));
return;
}
/* Already authenticat{ed,ing}? */
if (u->us_clientstate == UPAPCS_AUTHSENT ||
u->us_clientstate == UPAPCS_OPEN)
return;
/* Lower layer up? */
if (!(u->us_flags & UPAPF_LOWERUP)) {
u->us_flags |= UPAPF_AWPPENDING; /* Wait */
return;
}
/* User/passwd values valid? */
if (!(u->us_flags & UPAPF_UPVALID)) {
GETUSERPASSWD(unit); /* Start getting user and passwd */
if (!(u->us_flags & UPAPF_UPVALID)) {
u->us_flags |= UPAPF_UPPENDING; /* Wait */
return;
}
}
upap_sauth(u); /* Start protocol */
TIMEOUT(upap_timeout, u, u->us_timeouttime);
u->us_clientstate = UPAPCS_AUTHSENT;
u->us_retransmits = 0;
}
/*
* upap_authpeer - Authenticate our peer (start server).
*
* Set new state.
*/
void upap_authpeer(unit)
int unit;
{
upap_state *u = &upap[unit];
u->us_flags &= ~UPAPF_APPENDING; /* Clear pending flag */
/* Already authenticat{ed,ing}? */
if (u->us_serverstate == UPAPSS_LISTEN ||
u->us_serverstate == UPAPSS_OPEN)
return;
/* Lower layer up? */
if (!(u->us_flags & UPAPF_LOWERUP)) {
u->us_flags |= UPAPF_APPENDING; /* Wait for desired event */
return;
}
u->us_serverstate = UPAPSS_LISTEN;
}
/*
* upap_timeout - Timeout expired.
*/
void upap_timeout(u)
upap_state *u;
{
if (u->us_clientstate != UPAPCS_AUTHSENT)
return;
/* XXX Print warning after many retransmits? */
upap_sauth(u); /* Send Configure-Request */
TIMEOUT(upap_timeout, u, u->us_timeouttime);
++u->us_retransmits;
}
/*
* upap_lowerup - The lower layer is up.
*
* Start authenticating if pending.
*/
void upap_lowerup(unit)
int unit;
{
upap_state *u = &upap[unit];
u->us_flags |= UPAPF_LOWERUP;
if (u->us_flags & UPAPF_AWPPENDING) /* Attempting authwithpeer? */
upap_authwithpeer(unit); /* Try it now */
if (u->us_flags & UPAPF_APPENDING) /* Attempting authpeer? */
upap_authpeer(unit); /* Try it now */
}
/*
* upap_lowerdown - The lower layer is down.
*
* Cancel all timeouts.
*/
void upap_lowerdown(unit)
int unit;
{
upap_state *u = &upap[unit];
u->us_flags &= ~UPAPF_LOWERUP; /* XXX UPAP_UPVALID? */
if (u->us_clientstate == UPAPCS_AUTHSENT) /* Timeout pending? */
UNTIMEOUT(upap_timeout, u); /* Cancel timeout */
if (u->us_serverstate == UPAPSS_OPEN) /* User logged in? */
LOGOUT(unit);
u->us_clientstate = UPAPCS_CLOSED;
u->us_serverstate = UPAPSS_CLOSED;
}
/*
* upap_protrej - Peer doesn't speak this protocol.
*
* This shouldn't happen. In any case, pretend lower layer went down.
*/
void upap_protrej(unit)
int unit;
{
upap_lowerdown(unit);
}
/*
* upap_input - Input UPAP packet.
*/
void upap_input(unit, inpacket, l)
int unit;
PACKET *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 = PACKET_DATA(inpacket);
if (l < UPAP_HEADERLEN) {
UPAPDEBUG((stderr, "ppp: upap_input: rcvd short header.\n"));
goto freepacket;
}
GETCHAR(code, inp);
GETCHAR(id, inp);
GETSHORT(len, inp);
if (len < UPAP_HEADERLEN) {
UPAPDEBUG((stderr, "ppp: upap_input: rcvd illegal length.\n"));
goto freepacket;
}
if (len > l) {
UPAPDEBUG((stderr, "ppp: upap_input: rcvd short packet.\n"));
goto freepacket;
}
len -= UPAP_HEADERLEN;
/*
* Action depends on code.
*/
switch (code) {
case UPAP_AUTH:
upap_rauth(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;
}
freepacket:
PACKET_FREE(inpacket);
}
/*
* upap_rauth - Receive Authenticate.
*/
void upap_rauth(u, inp, id, len)
upap_state *u;
u_char *inp;
u_char id;
int len;
{
u_char ruserlen, rpasswdlen;
u_char *ruser, *rpasswd;
u_char retcode;
u_char *msg;
int msglen;
UPAPDEBUG((stderr, "ppp: upap_rauth: Rcvd id %d.\n", id));
if (u->us_serverstate != UPAPSS_LISTEN) /* XXX Reset connection? */
return;
/*
* Parse user/passwd.
*/
if (len < sizeof (u_char)) {
UPAPDEBUG((stderr, "ppp: upap_rauth: rcvd short packet.\n"));
return;
}
GETCHAR(ruserlen, inp);
len -= sizeof (u_char) + ruserlen + sizeof (u_char);;
if (len < 0) {
UPAPDEBUG((stderr, "ppp: upap_rauth: rcvd short packet.\n"));
return;
}
ruser = inp;
INCPTR(ruserlen, inp);
GETCHAR(rpasswdlen, inp);
if (len < rpasswdlen) {
UPAPDEBUG((stderr, "ppp: upap_rauth: rcvd short packet.\n"));
return;
}
rpasswd = inp;
retcode = LOGIN(u->us_unit, ruser, ruserlen, rpasswd, rpasswdlen,
&msg, &msglen);
upap_sresp(u, retcode, id, msg, msglen);
if (retcode == UPAP_AUTHACK) {
u->us_serverstate = UPAPSS_OPEN;
ipcp_activeopen(u->us_unit); /* Start IPCP */
}
}
/*
* upap_rauthack - Receive Authenticate-Ack.
*/
void upap_rauthack(u, inp, id, len)
upap_state *u;
u_char *inp;
u_char id;
int len;
{
u_char msglen;
u_char *msg;
UPAPDEBUG((stderr, "ppp: upap_rauthack: Rcvd id %d.\n", id));
if (u->us_clientstate != UPAPCS_AUTHSENT) /* XXX */
return;
/*
* Parse message.
*/
if (len < sizeof (u_char)) {
UPAPDEBUG((stderr, "ppp: upap_rauthack: rcvd short packet.\n"));
return;
}
GETCHAR(msglen, inp);
len -= sizeof (u_char);
if (len < msglen) {
UPAPDEBUG((stderr, "ppp: upap_rauthack: rcvd short packet.\n"));
return;
}
msg = inp;
PRINTMSG(msg, msglen);
u->us_clientstate = UPAPCS_OPEN;
ipcp_activeopen(u->us_unit); /* Start IPCP */
}
/*
* upap_rauthnak - Receive Authenticate-Nakk.
*/
void upap_rauthnak(u, inp, id, len)
upap_state *u;
u_char *inp;
u_char id;
int len;
{
u_char msglen;
u_char *msg;
UPAPDEBUG((stderr, "ppp: upap_rauthnak: Rcvd id %d.\n", id));
if (u->us_clientstate != UPAPCS_AUTHSENT) /* XXX */
return;
/*
* Parse message.
*/
if (len < sizeof (u_char)) {
UPAPDEBUG((stderr, "ppp: upap_rauthnak: rcvd short packet.\n"));
return;
}
GETCHAR(msglen, inp);
len -= sizeof (u_char);
if (len < msglen) {
UPAPDEBUG((stderr, "ppp: upap_rauthnak: rcvd short packet.\n"));
return;
}
msg = inp;
PRINTMSG(msg, msglen);
u->us_flags &= ~UPAPF_UPVALID; /* Clear valid flag */
u->us_clientstate = UPAPCS_CLOSED; /* Pretend for a moment */
upap_authwithpeer(u->us_unit); /* Restart */
}
/*
* upap_sauth - Send an Authenticate.
*/
void upap_sauth(u)
upap_state *u;
{
PACKET *outpacket;
u_char *outp;
int outlen;
outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) +
u->us_userlen + u->us_passwdlen;
outpacket = PACKET_ALLOC(outlen);
outp = PACKET_DATA(outpacket);
PUTCHAR(UPAP_AUTH, 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);
OUTPUT(u->us_unit, outpacket, outlen, UPAP);
UPAPDEBUG((stderr, "ppp: upap_sauth: Sent id %d.\n", u->us_id));
}
/*
* upap_sresp - Send a response (ack or nak).
*/
void upap_sresp(u, code, id, msg, msglen)
upap_state *u;
u_char code, id;
u_char *msg;
int msglen;
{
PACKET *outpacket;
u_char *outp;
int outlen;
outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
outpacket = PACKET_ALLOC(outlen);
outp = PACKET_DATA(outpacket);
PUTCHAR(code, outp);
PUTCHAR(id, outp);
PUTSHORT(outlen, outp);
PUTCHAR(msglen, outp);
BCOPY(msg, outp, msglen);
OUTPUT(u->us_unit, outpacket, outlen, UPAP);
UPAPDEBUG((stderr, "ppp: upap_sresp: Sent code %d, id %d.\n", code, id));
}
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