485 lines
11 KiB
C
485 lines
11 KiB
C
/*
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* upap.c - User/Password Authentication Protocol.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* TODO:
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <syslog.h>
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#ifdef STREAMS
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#include <sys/socket.h>
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#include <net/if.h>
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#include <sys/stream.h>
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#endif
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#include "ppp.h"
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#include "pppd.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "upap.h"
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#include "chap.h"
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#include "ipcp.h"
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upap_state upap[NPPP]; /* UPAP state; one for each unit */
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static void upap_timeout __ARGS((caddr_t));
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static void upap_rauth __ARGS((upap_state *, u_char *, int, int));
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static void upap_rauthack __ARGS((upap_state *, u_char *, int, int));
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static void upap_rauthnak __ARGS((upap_state *, u_char *, int, int));
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static void upap_sauth __ARGS((upap_state *));
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static void upap_sresp __ARGS((upap_state *, int, int, u_char *, int));
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/*
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* upap_init - Initialize a UPAP unit.
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*/
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void
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upap_init(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_unit = unit;
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u->us_user = NULL;
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u->us_userlen = 0;
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u->us_passwd = NULL;
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u->us_passwdlen = 0;
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u->us_clientstate = UPAPCS_CLOSED;
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u->us_serverstate = UPAPSS_CLOSED;
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u->us_flags = 0;
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u->us_id = 0;
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u->us_timeouttime = UPAP_DEFTIMEOUT;
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}
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/*
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* upap_authwithpeer - Authenticate us with our peer (start client).
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*
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* Set new state and send authenticate's.
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*/
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void
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upap_authwithpeer(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_flags &= ~UPAPF_AWPPENDING; /* Clear pending flag */
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/* Protect against programming errors that compromise security */
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if (u->us_serverstate != UPAPSS_CLOSED ||
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u->us_flags & UPAPF_APPENDING) {
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UPAPDEBUG((LOG_WARNING,
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"upap_authwithpeer: upap_authpeer already called!"))
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return;
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}
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/* Already authenticat{ed,ing}? */
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if (u->us_clientstate == UPAPCS_AUTHSENT ||
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u->us_clientstate == UPAPCS_OPEN)
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return;
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/* Lower layer up? */
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if (!(u->us_flags & UPAPF_LOWERUP)) {
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u->us_flags |= UPAPF_AWPPENDING; /* Wait */
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return;
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}
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/* User/passwd values valid? */
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if (!(u->us_flags & UPAPF_UPVALID)) {
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GETUSERPASSWD(unit); /* Start getting user and passwd */
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if (!(u->us_flags & UPAPF_UPVALID)) {
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u->us_flags |= UPAPF_UPPENDING; /* Wait */
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return;
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}
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}
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upap_sauth(u); /* Start protocol */
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/* TIMEOUT(upap_timeout, (caddr_t) u, u->us_timeouttime);*/
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u->us_clientstate = UPAPCS_AUTHSENT;
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u->us_retransmits = 0;
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}
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/*
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* upap_authpeer - Authenticate our peer (start server).
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*
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* Set new state.
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*/
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void
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upap_authpeer(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_flags &= ~UPAPF_APPENDING; /* Clear pending flag */
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/* Already authenticat{ed,ing}? */
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if (u->us_serverstate == UPAPSS_LISTEN ||
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u->us_serverstate == UPAPSS_OPEN)
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return;
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/* Lower layer up? */
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if (!(u->us_flags & UPAPF_LOWERUP)) {
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u->us_flags |= UPAPF_APPENDING; /* Wait for desired event */
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return;
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}
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u->us_serverstate = UPAPSS_LISTEN;
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}
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/*
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* upap_timeout - Timeout expired.
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*/
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static void
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upap_timeout(arg)
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caddr_t arg;
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{
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upap_state *u = (upap_state *) arg;
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if (u->us_clientstate != UPAPCS_AUTHSENT)
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return;
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/* XXX Print warning after many retransmits? */
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upap_sauth(u); /* Send Configure-Request */
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TIMEOUT(upap_timeout, (caddr_t) u, u->us_timeouttime);
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++u->us_retransmits;
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}
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/*
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* upap_lowerup - The lower layer is up.
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*
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* Start authenticating if pending.
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*/
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void
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upap_lowerup(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_flags |= UPAPF_LOWERUP;
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if (u->us_flags & UPAPF_AWPPENDING) /* Attempting authwithpeer? */
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upap_authwithpeer(unit); /* Try it now */
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if (u->us_flags & UPAPF_APPENDING) /* Attempting authpeer? */
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upap_authpeer(unit); /* Try it now */
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}
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/*
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* upap_lowerdown - The lower layer is down.
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*
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* Cancel all timeouts.
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*/
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void
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upap_lowerdown(unit)
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int unit;
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{
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upap_state *u = &upap[unit];
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u->us_flags &= ~UPAPF_LOWERUP; /* XXX UPAP_UPVALID? */
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if (u->us_clientstate == UPAPCS_AUTHSENT) /* Timeout pending? */
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UNTIMEOUT(upap_timeout, (caddr_t) u); /* Cancel timeout */
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if (u->us_serverstate == UPAPSS_OPEN) /* User logged in? */
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LOGOUT(unit);
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u->us_clientstate = UPAPCS_CLOSED;
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u->us_serverstate = UPAPSS_CLOSED;
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}
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/*
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* upap_protrej - Peer doesn't speak this protocol.
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*
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* This shouldn't happen. In any case, pretend lower layer went down.
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*/
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void
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upap_protrej(unit)
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int unit;
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{
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upap_lowerdown(unit);
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}
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/*
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* upap_input - Input UPAP packet.
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*/
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void
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upap_input(unit, inpacket, l)
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int unit;
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u_char *inpacket;
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int l;
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{
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upap_state *u = &upap[unit];
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u_char *inp;
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u_char code, id;
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int len;
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/*
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* Parse header (code, id and length).
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* If packet too short, drop it.
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*/
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inp = inpacket;
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if (l < UPAP_HEADERLEN) {
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UPAPDEBUG((LOG_INFO, "upap_input: rcvd short header."))
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return;
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}
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GETCHAR(code, inp);
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GETCHAR(id, inp);
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GETSHORT(len, inp);
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if (len < UPAP_HEADERLEN) {
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UPAPDEBUG((LOG_INFO, "upap_input: rcvd illegal length."))
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return;
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}
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if (len > l) {
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UPAPDEBUG((LOG_INFO, "upap_input: rcvd short packet."))
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return;
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}
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len -= UPAP_HEADERLEN;
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/*
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* Action depends on code.
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*/
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switch (code) {
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case UPAP_AUTH:
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upap_rauth(u, inp, id, len);
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break;
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case UPAP_AUTHACK:
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upap_rauthack(u, inp, id, len);
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break;
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case UPAP_AUTHNAK:
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upap_rauthnak(u, inp, id, len);
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break;
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default: /* XXX Need code reject */
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break;
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}
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}
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/*
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* upap_rauth - Receive Authenticate.
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*/
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static void
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upap_rauth(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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u_char id;
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int len;
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{
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u_char ruserlen, rpasswdlen;
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u_char *ruser, *rpasswd;
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u_char retcode;
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u_char *msg;
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int msglen;
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UPAPDEBUG((LOG_INFO, "upap_rauth: Rcvd id %d.", id))
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if (u->us_serverstate != UPAPSS_LISTEN) /* XXX Reset connection? */
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return;
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/*
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* Parse user/passwd.
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*/
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if (len < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "upap_rauth: rcvd short packet."))
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return;
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}
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GETCHAR(ruserlen, inp);
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len -= sizeof (u_char) + ruserlen + sizeof (u_char);;
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if (len < 0) {
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UPAPDEBUG((LOG_INFO, "upap_rauth: rcvd short packet."))
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return;
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}
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ruser = inp;
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INCPTR(ruserlen, inp);
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GETCHAR(rpasswdlen, inp);
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if (len < rpasswdlen) {
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UPAPDEBUG((LOG_INFO, "upap_rauth: rcvd short packet."))
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return;
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}
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rpasswd = inp;
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retcode = LOGIN(u->us_unit, (char *) ruser, (int) ruserlen, (char *) rpasswd,
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(int) rpasswdlen, (char **) &msg, &msglen);
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upap_sresp(u, retcode, id, msg, msglen);
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/* only crank up IPCP when either we aren't doing CHAP, or if we are, */
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/* that it is in open state */
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if (retcode == UPAP_AUTHACK) {
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u->us_serverstate = UPAPSS_OPEN;
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if (!lcp_hisoptions[u->us_unit].neg_chap ||
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(lcp_hisoptions[u->us_unit].neg_chap &&
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chap[u->us_unit].serverstate == CHAPSS_OPEN))
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ipcp_activeopen(u->us_unit); /* Start IPCP */
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}
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}
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/*
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* upap_rauthack - Receive Authenticate-Ack.
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*/
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static void
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upap_rauthack(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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u_char id;
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int len;
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{
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u_char msglen;
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u_char *msg;
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UPAPDEBUG((LOG_INFO, "upap_rauthack: Rcvd id %d.", id))
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if (u->us_clientstate != UPAPCS_AUTHSENT) /* XXX */
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return;
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/*
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* Parse message.
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*/
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if (len < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "upap_rauthack: rcvd short packet."))
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return;
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}
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GETCHAR(msglen, inp);
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG((LOG_INFO, "upap_rauthack: rcvd short packet."))
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return;
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}
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msg = inp;
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PRINTMSG(msg, msglen);
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u->us_clientstate = UPAPCS_OPEN;
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/* only crank up IPCP when either we aren't doing CHAP, or if we are, */
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/* that it is in open state */
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if (!lcp_gotoptions[u->us_unit].neg_chap ||
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(lcp_gotoptions[u->us_unit].neg_chap &&
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chap[u->us_unit].clientstate == CHAPCS_OPEN))
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ipcp_activeopen(u->us_unit); /* Start IPCP */
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}
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/*
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* upap_rauthnak - Receive Authenticate-Nakk.
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*/
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static void
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upap_rauthnak(u, inp, id, len)
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upap_state *u;
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u_char *inp;
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u_char id;
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int len;
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{
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u_char msglen;
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u_char *msg;
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UPAPDEBUG((LOG_INFO, "upap_rauthnak: Rcvd id %d.", id))
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if (u->us_clientstate != UPAPCS_AUTHSENT) /* XXX */
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return;
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/*
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* Parse message.
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*/
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if (len < sizeof (u_char)) {
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UPAPDEBUG((LOG_INFO, "upap_rauthnak: rcvd short packet."))
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return;
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}
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GETCHAR(msglen, inp);
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len -= sizeof (u_char);
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if (len < msglen) {
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UPAPDEBUG((LOG_INFO, "upap_rauthnak: rcvd short packet."))
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return;
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}
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msg = inp;
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PRINTMSG(msg, msglen);
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u->us_flags &= ~UPAPF_UPVALID; /* Clear valid flag */
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u->us_clientstate = UPAPCS_CLOSED; /* Pretend for a moment */
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upap_authwithpeer(u->us_unit); /* Restart */
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}
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/*
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* upap_sauth - Send an Authenticate.
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*/
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static void
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upap_sauth(u)
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upap_state *u;
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{
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u_char *outp;
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int outlen;
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outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) +
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u->us_userlen + u->us_passwdlen;
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outp = outpacket_buf;
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MAKEHEADER(outp, UPAP);
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PUTCHAR(UPAP_AUTH, outp);
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PUTCHAR(++u->us_id, outp);
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PUTSHORT(outlen, outp);
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PUTCHAR(u->us_userlen, outp);
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BCOPY(u->us_user, outp, u->us_userlen);
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INCPTR(u->us_userlen, outp);
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PUTCHAR(u->us_passwdlen, outp);
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BCOPY(u->us_passwd, outp, u->us_passwdlen);
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output(u->us_unit, outpacket_buf, outlen + DLLHEADERLEN);
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UPAPDEBUG((LOG_INFO, "upap_sauth: Sent id %d.", u->us_id))
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}
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/*
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* upap_sresp - Send a response (ack or nak).
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*/
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static void
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upap_sresp(u, code, id, msg, msglen)
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upap_state *u;
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u_char code, id;
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u_char *msg;
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int msglen;
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{
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u_char *outp;
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int outlen;
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outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
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outp = outpacket_buf;
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MAKEHEADER(outp, UPAP);
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PUTCHAR(code, outp);
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PUTCHAR(id, outp);
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PUTSHORT(outlen, outp);
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PUTCHAR(msglen, outp);
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BCOPY(msg, outp, msglen);
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output(u->us_unit, outpacket_buf, outlen + DLLHEADERLEN);
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UPAPDEBUG((LOG_INFO, "upap_sresp: Sent code %d, id %d.", code, id))
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}
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