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/*
* PPP PAP Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993-94, Internet Initiative Japan, Inc.
* All rights reserverd.
*
* 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 Internet Initiative Japan, Inc. The name of the
* IIJ 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.
*
* $Id: pap.c,v 1.4 1998/03/13 01:26:01 brian Exp $
*
* TODO:
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef __OpenBSD__
#include <util.h>
#else
#include <libutil.h>
#endif
#include <utmp.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcp.h"
#include "pap.h"
#include "loadalias.h"
#include "vars.h"
#include "hdlc.h"
#include "lcpproto.h"
#include "phase.h"
#include "auth.h"
#include "id.h"
static const char *papcodes[] = { "???", "REQUEST", "ACK", "NAK" };
static void
SendPapChallenge(int papid)
{
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int namelen, keylen, plen;
namelen = strlen(VarAuthName);
keylen = strlen(VarAuthKey);
plen = namelen + keylen + 2;
LogPrintf(LogDEBUG, "SendPapChallenge: namelen = %d, keylen = %d\n",
namelen, keylen);
if (LogIsKept(LogDEBUG))
LogPrintf(LogPHASE, "PAP: %s (%s)\n", VarAuthName, VarAuthKey);
else
LogPrintf(LogPHASE, "PAP: %s\n", VarAuthName);
lh.code = PAP_REQUEST;
lh.id = papid;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = mballoc(plen + sizeof(struct fsmheader), MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
*cp++ = namelen;
memcpy(cp, VarAuthName, namelen);
cp += namelen;
*cp++ = keylen;
memcpy(cp, VarAuthKey, keylen);
HdlcOutput(PRI_LINK, PROTO_PAP, bp);
}
struct authinfo AuthPapInfo = {
SendPapChallenge,
};
static void
SendPapCode(int id, int code, const char *message)
{
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int plen, mlen;
lh.code = code;
lh.id = id;
mlen = strlen(message);
plen = mlen + 1;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = mballoc(plen + sizeof(struct fsmheader), MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
*cp++ = mlen;
memcpy(cp, message, mlen);
LogPrintf(LogPHASE, "PapOutput: %s\n", papcodes[code]);
HdlcOutput(PRI_LINK, PROTO_PAP, bp);
}
/*
* Validate given username and passwrd against with secret table
*/
static int
PapValidate(u_char * name, u_char * key)
{
int nlen, klen;
nlen = *name++;
klen = *key;
*key++ = 0;
key[klen] = 0;
LogPrintf(LogDEBUG, "PapValidate: name %s (%d), key %s (%d)\n",
name, nlen, key, klen);
#ifndef NOPASSWDAUTH
if (Enabled(ConfPasswdAuth)) {
struct passwd *pwd;
int result;
LogPrintf(LogLCP, "Using PasswdAuth\n");
result = (pwd = getpwnam(name)) &&
!strcmp(crypt(key, pwd->pw_passwd), pwd->pw_passwd);
endpwent();
return result;
}
#endif
return (AuthValidate(SECRETFILE, name, key));
}
void
PapInput(struct mbuf * bp)
{
int len = plength(bp);
struct fsmheader *php;
struct lcpstate *lcp = &LcpInfo;
u_char *cp;
if (len >= sizeof(struct fsmheader)) {
php = (struct fsmheader *) MBUF_CTOP(bp);
if (len >= ntohs(php->length)) {
if (php->code < PAP_REQUEST || php->code > PAP_NAK)
php->code = 0;
LogPrintf(LogPHASE, "PapInput: %s\n", papcodes[php->code]);
switch (php->code) {
case PAP_REQUEST:
cp = (u_char *) (php + 1);
if (PapValidate(cp, cp + *cp + 1)) {
SendPapCode(php->id, PAP_ACK, "Greetings!!");
lcp->auth_ineed = 0;
if (lcp->auth_iwait == 0) {
if ((mode & MODE_DIRECT) && isatty(modem) && Enabled(ConfUtmp)) {
if (Utmp)
LogPrintf(LogERROR, "Oops, already logged in on %s\n",
VarBaseDevice);
else {
struct utmp ut;
memset(&ut, 0, sizeof ut);
time(&ut.ut_time);
strncpy(ut.ut_name, cp+1, sizeof ut.ut_name);
strncpy(ut.ut_line, VarBaseDevice, sizeof ut.ut_line - 1);
ID0login(&ut);
Utmp = 1;
}
}
NewPhase(PHASE_NETWORK);
}
} else {
SendPapCode(php->id, PAP_NAK, "Login incorrect");
reconnect(RECON_FALSE);
LcpClose();
}
break;
case PAP_ACK:
StopAuthTimer(&AuthPapInfo);
cp = (u_char *) (php + 1);
len = *cp++;
cp[len] = 0;
LogPrintf(LogPHASE, "Received PAP_ACK (%s)\n", cp);
if (lcp->auth_iwait == PROTO_PAP) {
lcp->auth_iwait = 0;
if (lcp->auth_ineed == 0)
NewPhase(PHASE_NETWORK);
}
break;
case PAP_NAK:
StopAuthTimer(&AuthPapInfo);
cp = (u_char *) (php + 1);
len = *cp++;
cp[len] = 0;
LogPrintf(LogPHASE, "Received PAP_NAK (%s)\n", cp);
reconnect(RECON_FALSE);
LcpClose();
break;
}
}
}
pfree(bp);
}
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