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freebsd/usr.sbin/ppp/pap.c
Brian Somers 30949fd4b5 o Add ipv6 support, abstracting most NCP addresses into opaque
structures (well, they're treated as opaque).

  It's now possible to manage IPv6 interface addresses and routing
  table entries and to filter IPV6 traffic whether encapsulated or
  not.

  IPV6CP support is crude for now, and hasn't been tested against
  any other implementations.

  RADIUS and IPv6 are independent of eachother for now.

  ppp.linkup/ppp.linkdown aren't currently used by IPV6CP

o Understand all protocols(5) in filter rules rather than only a select
  few.

o Allow a mask specification for the ``delete'' command.  It's now
  possible to specifically delete one of two conflicting routes.

o When creating and deleting proxy arp entries, do it for all IPv4
  interface addresses rather than doing it just for the ``current''
  peer address.

o When iface-alias isn't in effect, don't blow away manually (via ``iface
  add'') added interface addresses.

o When listening on a tcp server (diagnostic) socket, bind so that a
  tcp46 socket is created -- allowing both IPv4 and IPv6 connections.

o When displaying ICMP traffic, don't display the icmp type twice.
  When display traffic, display at least some information about unrecognised
  traffic.

o Bump version

Inspired after filtering work by: Makoto MATSUSHITA <matusita@jp.FreeBSD.org>
2001-08-14 16:05:52 +00:00

297 lines
8.6 KiB
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.
*
* $FreeBSD$
*/
#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 "ip.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)
{
datalink_GotAuthname(authp->physical->dl, authp->in.name);
SendPapCode(authp, PAP_ACK, "Greetings!!");
authp->physical->link.lcp.auth_ineed = 0;
if (Enabled(authp->physical->dl->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)
radius_Authenticate(&bundle->radius, authp, authp->in.name,
key, strlen(key), NULL, 0);
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;
}