FreeBSD-5.3/usr.sbin/ppp/pap.c
/*-
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/usr.sbin/ppp/pap.c,v 1.50 2002/06/17 01:12:38 brian Exp $
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdlib.h>
#include <string.h> /* strlen/memcpy */
#include <termios.h>
#include "layer.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "auth.h"
#include "pap.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "proto.h"
#include "async.h"
#include "throughput.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "iplist.h"
#include "slcompress.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "filter.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "chat.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
static const char * const papcodes[] = {
"???", "REQUEST", "SUCCESS", "FAILURE"
};
#define MAXPAPCODE (sizeof papcodes / sizeof papcodes[0] - 1)
static void
pap_Req(struct authinfo *authp)
{
struct bundle *bundle = authp->physical->dl->bundle;
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int namelen, keylen, plen;
namelen = strlen(bundle->cfg.auth.name);
keylen = strlen(bundle->cfg.auth.key);
plen = namelen + keylen + 2;
log_Printf(LogDEBUG, "pap_Req: namelen = %d, keylen = %d\n", namelen, keylen);
log_Printf(LogPHASE, "Pap Output: %s ********\n", bundle->cfg.auth.name);
if (*bundle->cfg.auth.name == '\0')
log_Printf(LogWARN, "Sending empty PAP authname!\n");
lh.code = PAP_REQUEST;
lh.id = authp->id;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = m_get(plen + sizeof(struct fsmheader), MB_PAPOUT);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
*cp++ = namelen;
memcpy(cp, bundle->cfg.auth.name, namelen);
cp += namelen;
*cp++ = keylen;
memcpy(cp, bundle->cfg.auth.key, keylen);
link_PushPacket(&authp->physical->link, bp, bundle,
LINK_QUEUES(&authp->physical->link) - 1, PROTO_PAP);
}
static void
SendPapCode(struct authinfo *authp, int code, const char *message)
{
struct fsmheader lh;
struct mbuf *bp;
u_char *cp;
int plen, mlen;
lh.code = code;
lh.id = authp->id;
mlen = strlen(message);
plen = mlen + 1;
lh.length = htons(plen + sizeof(struct fsmheader));
bp = m_get(plen + sizeof(struct fsmheader), MB_PAPOUT);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
cp = MBUF_CTOP(bp) + sizeof(struct fsmheader);
/*
* If our message is longer than 255 bytes, truncate the length to
* 255 and send the entire message anyway. Maybe the other end will
* display it... (see pap_Input() !)
*/
*cp++ = mlen > 255 ? 255 : mlen;
memcpy(cp, message, mlen);
log_Printf(LogPHASE, "Pap Output: %s\n", papcodes[code]);
link_PushPacket(&authp->physical->link, bp, authp->physical->dl->bundle,
LINK_QUEUES(&authp->physical->link) - 1, PROTO_PAP);
}
static void
pap_Success(struct authinfo *authp)
{
struct bundle *bundle = authp->physical->dl->bundle;
datalink_GotAuthname(authp->physical->dl, authp->in.name);
#ifndef NORADIUS
if (*bundle->radius.cfg.file && bundle->radius.repstr)
SendPapCode(authp, PAP_ACK, bundle->radius.repstr);
else
#endif
SendPapCode(authp, PAP_ACK, "Greetings!!");
authp->physical->link.lcp.auth_ineed = 0;
if (Enabled(bundle, OPT_UTMP))
physical_Login(authp->physical, authp->in.name);
if (authp->physical->link.lcp.auth_iwait == 0)
/*
* Either I didn't need to authenticate, or I've already been
* told that I got the answer right.
*/
datalink_AuthOk(authp->physical->dl);
}
static void
pap_Failure(struct authinfo *authp)
{
SendPapCode(authp, PAP_NAK, "Login incorrect");
datalink_AuthNotOk(authp->physical->dl);
}
void
pap_Init(struct authinfo *pap, struct physical *p)
{
auth_Init(pap, p, pap_Req, pap_Success, pap_Failure);
}
struct mbuf *
pap_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
struct physical *p = link2physical(l);
struct authinfo *authp = &p->dl->pap;
u_char nlen, klen, *key;
const char *txt;
int txtlen;
if (p == NULL) {
log_Printf(LogERROR, "pap_Input: Not a physical link - dropped\n");
m_freem(bp);
return NULL;
}
if (bundle_Phase(bundle) != PHASE_NETWORK &&
bundle_Phase(bundle) != PHASE_AUTHENTICATE) {
log_Printf(LogPHASE, "Unexpected pap input - dropped !\n");
m_freem(bp);
return NULL;
}
if ((bp = auth_ReadHeader(authp, bp)) == NULL &&
ntohs(authp->in.hdr.length) == 0) {
log_Printf(LogWARN, "Pap Input: Truncated header !\n");
return NULL;
}
if (authp->in.hdr.code == 0 || authp->in.hdr.code > MAXPAPCODE) {
log_Printf(LogPHASE, "Pap Input: %d: Bad PAP code !\n", authp->in.hdr.code);
m_freem(bp);
return NULL;
}
if (authp->in.hdr.code != PAP_REQUEST && authp->id != authp->in.hdr.id &&
Enabled(bundle, OPT_IDCHECK)) {
/* Wrong conversation dude ! */
log_Printf(LogPHASE, "Pap Input: %s dropped (got id %d, not %d)\n",
papcodes[authp->in.hdr.code], authp->in.hdr.id, authp->id);
m_freem(bp);
return NULL;
}
m_settype(bp, MB_PAPIN);
authp->id = authp->in.hdr.id; /* We respond with this id */
if (bp) {
bp = mbuf_Read(bp, &nlen, 1);
if (authp->in.hdr.code == PAP_ACK) {
/*
* Don't restrict the length of our acknowledgement freetext to
* nlen (a one-byte length). Show the rest of the ack packet
* instead. This isn't really part of the protocol.....
*/
bp = m_pullup(bp);
txt = MBUF_CTOP(bp);
txtlen = m_length(bp);
} else {
bp = auth_ReadName(authp, bp, nlen);
txt = authp->in.name;
txtlen = strlen(authp->in.name);
}
} else {
txt = "";
txtlen = 0;
}
log_Printf(LogPHASE, "Pap Input: %s (%.*s)\n",
papcodes[authp->in.hdr.code], txtlen, txt);
switch (authp->in.hdr.code) {
case PAP_REQUEST:
if (bp == NULL) {
log_Printf(LogPHASE, "Pap Input: No key given !\n");
break;
}
bp = mbuf_Read(bp, &klen, 1);
if (m_length(bp) < klen) {
log_Printf(LogERROR, "Pap Input: Truncated key !\n");
break;
}
if ((key = malloc(klen+1)) == NULL) {
log_Printf(LogERROR, "Pap Input: Out of memory !\n");
break;
}
bp = mbuf_Read(bp, key, klen);
key[klen] = '\0';
#ifndef NORADIUS
if (*bundle->radius.cfg.file) {
if (!radius_Authenticate(&bundle->radius, authp, authp->in.name,
key, strlen(key), NULL, 0))
pap_Failure(authp);
} else
#endif
if (auth_Validate(bundle, authp->in.name, key, p))
pap_Success(authp);
else
pap_Failure(authp);
free(key);
break;
case PAP_ACK:
auth_StopTimer(authp);
if (p->link.lcp.auth_iwait == PROTO_PAP) {
p->link.lcp.auth_iwait = 0;
if (p->link.lcp.auth_ineed == 0)
/*
* We've succeeded in our ``login''
* If we're not expecting the peer to authenticate (or he already
* has), proceed to network phase.
*/
datalink_AuthOk(p->dl);
}
break;
case PAP_NAK:
auth_StopTimer(authp);
datalink_AuthNotOk(p->dl);
break;
}
m_freem(bp);
return NULL;
}