250be50b72
path... after we've talked to any RADIUS servers involved, so that we haven't touched the data before it gets to the server. Make it clearer in the code that this compensation is done by setting a flag to a value of zero, a flag which rfc2759 says *MUST* be zero. While we're here, don't bother passing the peer challenge into radius_Authenticate(). It's already part of the key we're passing in (this becomes obvious now that I've structured that data...). This ``fix'' doesn't help to authenticate Win98/WinME users in my test environment as ports/net/freeradius seems to ignore the flag completely anyway, but it may help with other RADIUS servers.
963 lines
27 KiB
C
963 lines
27 KiB
C
/*-
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifndef NODES
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#include <md4.h>
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#endif
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#include <md5.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <termios.h>
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#include <unistd.h>
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#include "layer.h"
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#include "mbuf.h"
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#include "log.h"
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#include "defs.h"
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#include "timer.h"
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#include "fsm.h"
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#include "proto.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "lcp.h"
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#include "auth.h"
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#include "async.h"
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#include "throughput.h"
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#include "descriptor.h"
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#include "chap.h"
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#include "iplist.h"
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#include "slcompress.h"
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#include "ncpaddr.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "ccp.h"
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#include "link.h"
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#include "physical.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "ipv6cp.h"
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#include "ncp.h"
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#include "bundle.h"
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#include "chat.h"
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#include "cbcp.h"
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#include "command.h"
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#include "datalink.h"
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#ifndef NODES
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#include "chap_ms.h"
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#include "mppe.h"
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#endif
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#include "id.h"
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static const char * const chapcodes[] = {
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"???", "CHALLENGE", "RESPONSE", "SUCCESS", "FAILURE"
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};
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#define MAXCHAPCODE (sizeof chapcodes / sizeof chapcodes[0] - 1)
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static void
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ChapOutput(struct physical *physical, u_int code, u_int id,
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const u_char *ptr, int count, const char *text)
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{
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int plen;
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struct fsmheader lh;
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struct mbuf *bp;
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plen = sizeof(struct fsmheader) + count;
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lh.code = code;
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lh.id = id;
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lh.length = htons(plen);
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bp = m_get(plen, MB_CHAPOUT);
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memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
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if (count)
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memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count);
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log_DumpBp(LogDEBUG, "ChapOutput", bp);
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if (text == NULL)
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log_Printf(LogPHASE, "Chap Output: %s\n", chapcodes[code]);
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else
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log_Printf(LogPHASE, "Chap Output: %s (%s)\n", chapcodes[code], text);
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link_PushPacket(&physical->link, bp, physical->dl->bundle,
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LINK_QUEUES(&physical->link) - 1, PROTO_CHAP);
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}
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static char *
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chap_BuildAnswer(char *name, char *key, u_char id, char *challenge, u_char type
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#ifndef NODES
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, char *peerchallenge, char *authresponse, int lanman
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#endif
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)
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{
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char *result, *digest;
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size_t nlen, klen;
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nlen = strlen(name);
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klen = strlen(key);
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#ifndef NODES
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if (type == 0x80) {
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char expkey[AUTHLEN << 2];
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MD4_CTX MD4context;
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int f;
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if ((result = malloc(1 + nlen + MS_CHAP_RESPONSE_LEN)) == NULL)
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return result;
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digest = result; /* the response */
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*digest++ = MS_CHAP_RESPONSE_LEN; /* 49 */
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memcpy(digest + MS_CHAP_RESPONSE_LEN, name, nlen);
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if (lanman) {
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memset(digest + 24, '\0', 25);
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mschap_LANMan(digest, challenge + 1, key); /* LANMan response */
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} else {
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memset(digest, '\0', 25);
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digest += 24;
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for (f = 0; f < klen; f++) {
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expkey[2*f] = key[f];
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expkey[2*f+1] = '\0';
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}
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/*
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* -----------
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* expkey = | k\0e\0y\0 |
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* -----------
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*/
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MD4Init(&MD4context);
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MD4Update(&MD4context, expkey, klen << 1);
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MD4Final(digest, &MD4context);
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/*
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* ---- -------- ---------------- ------- ------
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* result = | 49 | LANMan | 16 byte digest | 9 * ? | name |
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* ---- -------- ---------------- ------- ------
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*/
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mschap_NT(digest, challenge + 1);
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}
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/*
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* ---- -------- ------------- ----- ------
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* | | struct MS_ChapResponse24 | |
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* result = | 49 | LANMan | NT digest | 0/1 | name |
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* ---- -------- ------------- ----- ------
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* where only one of LANMan & NT digest are set.
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*/
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} else if (type == 0x81) {
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char expkey[AUTHLEN << 2];
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char pwdhash[CHAP81_HASH_LEN];
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char pwdhashhash[CHAP81_HASH_LEN];
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char *ntresponse;
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int f;
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if ((result = malloc(1 + nlen + CHAP81_RESPONSE_LEN)) == NULL)
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return result;
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memset(result, 0, 1 + nlen + CHAP81_RESPONSE_LEN);
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digest = result;
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*digest++ = CHAP81_RESPONSE_LEN; /* value size */
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/* Copy our challenge */
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memcpy(digest, peerchallenge + 1, CHAP81_CHALLENGE_LEN);
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/* Expand password to Unicode XXX */
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for (f = 0; f < klen; f++) {
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expkey[2*f] = key[f];
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expkey[2*f+1] = '\0';
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}
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ntresponse = digest + CHAP81_NTRESPONSE_OFF;
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/* Get some needed hashes */
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NtPasswordHash(expkey, klen * 2, pwdhash);
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HashNtPasswordHash(pwdhash, pwdhashhash);
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/* Generate NTRESPONSE to respond on challenge call */
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GenerateNTResponse(challenge + 1, peerchallenge + 1, name, nlen,
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expkey, klen * 2, ntresponse);
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/* Generate MPPE MASTERKEY */
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GetMasterKey(pwdhashhash, ntresponse, MPPE_MasterKey); /* XXX Global ! */
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/* Generate AUTHRESPONSE to verify on auth success */
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GenerateAuthenticatorResponse(expkey, klen * 2, ntresponse,
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peerchallenge + 1, challenge + 1, name, nlen,
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authresponse);
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authresponse[CHAP81_AUTHRESPONSE_LEN] = 0;
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memcpy(digest + CHAP81_RESPONSE_LEN, name, nlen);
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} else
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#endif
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if ((result = malloc(nlen + 17)) != NULL) {
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/* Normal MD5 stuff */
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MD5_CTX MD5context;
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digest = result;
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*digest++ = 16; /* value size */
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MD5Init(&MD5context);
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MD5Update(&MD5context, &id, 1);
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MD5Update(&MD5context, key, klen);
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MD5Update(&MD5context, challenge + 1, *challenge);
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MD5Final(digest, &MD5context);
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memcpy(digest + 16, name, nlen);
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/*
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* ---- -------- ------
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* result = | 16 | digest | name |
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* ---- -------- ------
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*/
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}
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return result;
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}
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static void
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chap_StartChild(struct chap *chap, char *prog, const char *name)
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{
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char *argv[MAXARGS], *nargv[MAXARGS];
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int argc, fd;
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int in[2], out[2];
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pid_t pid;
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if (chap->child.fd != -1) {
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log_Printf(LogWARN, "Chap: %s: Program already running\n", prog);
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return;
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}
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if (pipe(in) == -1) {
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log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno));
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return;
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}
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if (pipe(out) == -1) {
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log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno));
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close(in[0]);
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close(in[1]);
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return;
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}
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pid = getpid();
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switch ((chap->child.pid = fork())) {
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case -1:
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log_Printf(LogERROR, "Chap: fork: %s\n", strerror(errno));
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close(in[0]);
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close(in[1]);
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close(out[0]);
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close(out[1]);
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chap->child.pid = 0;
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return;
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case 0:
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timer_TermService();
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if ((argc = command_Interpret(prog, strlen(prog), argv)) <= 0) {
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if (argc < 0) {
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log_Printf(LogWARN, "CHAP: Invalid command syntax\n");
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_exit(255);
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}
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_exit(0);
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}
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close(in[1]);
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close(out[0]);
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if (out[1] == STDIN_FILENO)
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out[1] = dup(out[1]);
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dup2(in[0], STDIN_FILENO);
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dup2(out[1], STDOUT_FILENO);
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close(STDERR_FILENO);
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if (open(_PATH_DEVNULL, O_RDWR) != STDERR_FILENO) {
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log_Printf(LogALERT, "Chap: Failed to open %s: %s\n",
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_PATH_DEVNULL, strerror(errno));
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exit(1);
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}
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for (fd = getdtablesize(); fd > STDERR_FILENO; fd--)
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fcntl(fd, F_SETFD, 1);
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#ifndef NOSUID
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setuid(ID0realuid());
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#endif
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command_Expand(nargv, argc, (char const *const *)argv,
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chap->auth.physical->dl->bundle, 0, pid);
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execvp(nargv[0], nargv);
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printf("exec() of %s failed: %s\n", nargv[0], strerror(errno));
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_exit(255);
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default:
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close(in[0]);
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close(out[1]);
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chap->child.fd = out[0];
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chap->child.buf.len = 0;
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write(in[1], chap->auth.in.name, strlen(chap->auth.in.name));
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write(in[1], "\n", 1);
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write(in[1], chap->challenge.peer + 1, *chap->challenge.peer);
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write(in[1], "\n", 1);
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write(in[1], name, strlen(name));
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write(in[1], "\n", 1);
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close(in[1]);
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break;
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}
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}
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static void
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chap_Cleanup(struct chap *chap, int sig)
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{
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if (chap->child.pid) {
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int status;
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close(chap->child.fd);
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chap->child.fd = -1;
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if (sig)
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kill(chap->child.pid, SIGTERM);
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chap->child.pid = 0;
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chap->child.buf.len = 0;
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if (wait(&status) == -1)
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log_Printf(LogERROR, "Chap: wait: %s\n", strerror(errno));
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else if (WIFSIGNALED(status))
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log_Printf(LogWARN, "Chap: Child received signal %d\n", WTERMSIG(status));
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else if (WIFEXITED(status) && WEXITSTATUS(status))
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log_Printf(LogERROR, "Chap: Child exited %d\n", WEXITSTATUS(status));
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}
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*chap->challenge.local = *chap->challenge.peer = '\0';
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#ifndef NODES
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chap->peertries = 0;
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#endif
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}
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static void
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chap_Respond(struct chap *chap, char *name, char *key, u_char type
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#ifndef NODES
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, int lm
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#endif
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)
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{
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u_char *ans;
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ans = chap_BuildAnswer(name, key, chap->auth.id, chap->challenge.peer, type
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#ifndef NODES
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, chap->challenge.local, chap->authresponse, lm
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#endif
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);
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if (ans) {
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ChapOutput(chap->auth.physical, CHAP_RESPONSE, chap->auth.id,
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ans, *ans + 1 + strlen(name), name);
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#ifndef NODES
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chap->NTRespSent = !lm;
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MPPE_IsServer = 0; /* XXX Global ! */
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#endif
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free(ans);
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} else
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ChapOutput(chap->auth.physical, CHAP_FAILURE, chap->auth.id,
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"Out of memory!", 14, NULL);
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}
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static int
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chap_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
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{
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struct chap *chap = descriptor2chap(d);
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if (r && chap && chap->child.fd != -1) {
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FD_SET(chap->child.fd, r);
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if (*n < chap->child.fd + 1)
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*n = chap->child.fd + 1;
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log_Printf(LogTIMER, "Chap: fdset(r) %d\n", chap->child.fd);
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return 1;
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}
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return 0;
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}
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static int
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chap_IsSet(struct fdescriptor *d, const fd_set *fdset)
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{
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struct chap *chap = descriptor2chap(d);
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return chap && chap->child.fd != -1 && FD_ISSET(chap->child.fd, fdset);
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}
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static void
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chap_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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struct chap *chap = descriptor2chap(d);
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int got;
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got = read(chap->child.fd, chap->child.buf.ptr + chap->child.buf.len,
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sizeof chap->child.buf.ptr - chap->child.buf.len - 1);
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if (got == -1) {
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log_Printf(LogERROR, "Chap: Read: %s\n", strerror(errno));
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chap_Cleanup(chap, SIGTERM);
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} else if (got == 0) {
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log_Printf(LogWARN, "Chap: Read: Child terminated connection\n");
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chap_Cleanup(chap, SIGTERM);
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} else {
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char *name, *key, *end;
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chap->child.buf.len += got;
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chap->child.buf.ptr[chap->child.buf.len] = '\0';
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name = chap->child.buf.ptr;
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name += strspn(name, " \t");
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if ((key = strchr(name, '\n')) == NULL)
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end = NULL;
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else
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end = strchr(++key, '\n');
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if (end == NULL) {
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if (chap->child.buf.len == sizeof chap->child.buf.ptr - 1) {
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log_Printf(LogWARN, "Chap: Read: Input buffer overflow\n");
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chap_Cleanup(chap, SIGTERM);
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}
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} else {
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#ifndef NODES
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int lanman = chap->auth.physical->link.lcp.his_authtype == 0x80 &&
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((chap->NTRespSent &&
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IsAccepted(chap->auth.physical->link.lcp.cfg.chap80lm)) ||
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!IsAccepted(chap->auth.physical->link.lcp.cfg.chap80nt));
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#endif
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while (end >= name && strchr(" \t\r\n", *end))
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*end-- = '\0';
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end = key - 1;
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while (end >= name && strchr(" \t\r\n", *end))
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*end-- = '\0';
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key += strspn(key, " \t");
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chap_Respond(chap, name, key, chap->auth.physical->link.lcp.his_authtype
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#ifndef NODES
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, lanman
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#endif
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);
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chap_Cleanup(chap, 0);
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}
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}
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}
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static int
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chap_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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/* We never want to write here ! */
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log_Printf(LogALERT, "chap_Write: Internal error: Bad call !\n");
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return 0;
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}
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static void
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chap_ChallengeInit(struct authinfo *authp)
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{
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struct chap *chap = auth2chap(authp);
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int len, i;
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char *cp;
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len = strlen(authp->physical->dl->bundle->cfg.auth.name);
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if (!*chap->challenge.local) {
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randinit();
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cp = chap->challenge.local;
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#ifndef NORADIUS
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|
if (*authp->physical->dl->bundle->radius.cfg.file) {
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|
/* For radius, our challenge is 16 readable NUL terminated bytes :*/
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|
*cp++ = 16;
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for (i = 0; i < 16; i++)
|
|
*cp++ = (random() % 10) + '0';
|
|
} else
|
|
#endif
|
|
{
|
|
#ifndef NODES
|
|
if (authp->physical->link.lcp.want_authtype == 0x80)
|
|
*cp++ = 8; /* MS does 8 byte callenges :-/ */
|
|
else if (authp->physical->link.lcp.want_authtype == 0x81)
|
|
*cp++ = 16; /* MS-CHAP-V2 does 16 bytes challenges */
|
|
else
|
|
#endif
|
|
*cp++ = random() % (CHAPCHALLENGELEN-16) + 16;
|
|
for (i = 0; i < *chap->challenge.local; i++)
|
|
*cp++ = random() & 0xff;
|
|
}
|
|
memcpy(cp, authp->physical->dl->bundle->cfg.auth.name, len);
|
|
}
|
|
}
|
|
|
|
static void
|
|
chap_Challenge(struct authinfo *authp)
|
|
{
|
|
struct chap *chap = auth2chap(authp);
|
|
int len;
|
|
|
|
log_Printf(LogDEBUG, "CHAP%02X: Challenge\n",
|
|
authp->physical->link.lcp.want_authtype);
|
|
|
|
len = strlen(authp->physical->dl->bundle->cfg.auth.name);
|
|
|
|
/* Generate new local challenge value */
|
|
if (!*chap->challenge.local)
|
|
chap_ChallengeInit(authp);
|
|
|
|
#ifndef NODES
|
|
if (authp->physical->link.lcp.want_authtype == 0x81)
|
|
ChapOutput(authp->physical, CHAP_CHALLENGE, authp->id,
|
|
chap->challenge.local, 1 + *chap->challenge.local, NULL);
|
|
else
|
|
#endif
|
|
ChapOutput(authp->physical, CHAP_CHALLENGE, authp->id,
|
|
chap->challenge.local, 1 + *chap->challenge.local + len, NULL);
|
|
}
|
|
|
|
static void
|
|
chap_Success(struct authinfo *authp)
|
|
{
|
|
struct bundle *bundle = authp->physical->dl->bundle;
|
|
const char *msg;
|
|
|
|
datalink_GotAuthname(authp->physical->dl, authp->in.name);
|
|
#ifndef NODES
|
|
if (authp->physical->link.lcp.want_authtype == 0x81) {
|
|
#ifndef NORADIUS
|
|
if (*bundle->radius.cfg.file && bundle->radius.msrepstr)
|
|
msg = bundle->radius.msrepstr;
|
|
else
|
|
#endif
|
|
msg = auth2chap(authp)->authresponse;
|
|
MPPE_MasterKeyValid = 1; /* XXX Global ! */
|
|
} else
|
|
#endif
|
|
#ifndef NORADIUS
|
|
if (*bundle->radius.cfg.file && bundle->radius.repstr)
|
|
msg = bundle->radius.repstr;
|
|
else
|
|
#endif
|
|
msg = "Welcome!!";
|
|
|
|
ChapOutput(authp->physical, CHAP_SUCCESS, authp->id, msg, strlen(msg),
|
|
NULL);
|
|
|
|
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
|
|
chap_Failure(struct authinfo *authp)
|
|
{
|
|
#ifndef NODES
|
|
char buf[1024], *ptr;
|
|
#endif
|
|
const char *msg;
|
|
|
|
#ifndef NORADIUS
|
|
struct bundle *bundle = authp->physical->link.lcp.fsm.bundle;
|
|
if (*bundle->radius.cfg.file && bundle->radius.errstr)
|
|
msg = bundle->radius.errstr;
|
|
else
|
|
#endif
|
|
#ifndef NODES
|
|
if (authp->physical->link.lcp.want_authtype == 0x80) {
|
|
sprintf(buf, "E=691 R=1 M=Invalid!");
|
|
msg = buf;
|
|
} else if (authp->physical->link.lcp.want_authtype == 0x81) {
|
|
int i;
|
|
|
|
ptr = buf;
|
|
ptr += sprintf(buf, "E=691 R=0 C=");
|
|
for (i=0; i<16; i++)
|
|
ptr += sprintf(ptr, "%02X", *(auth2chap(authp)->challenge.local+1+i));
|
|
|
|
sprintf(ptr, " V=3 M=Invalid!");
|
|
msg = buf;
|
|
} else
|
|
#endif
|
|
msg = "Invalid!!";
|
|
|
|
ChapOutput(authp->physical, CHAP_FAILURE, authp->id, msg, strlen(msg) + 1,
|
|
NULL);
|
|
datalink_AuthNotOk(authp->physical->dl);
|
|
}
|
|
|
|
static int
|
|
chap_Cmp(u_char type, char *myans, int mylen, char *hisans, int hislen
|
|
#ifndef NODES
|
|
, int lm
|
|
#endif
|
|
)
|
|
{
|
|
if (mylen != hislen)
|
|
return 0;
|
|
#ifndef NODES
|
|
else if (type == 0x80) {
|
|
int off = lm ? 0 : 24;
|
|
|
|
if (memcmp(myans + off, hisans + off, 24))
|
|
return 0;
|
|
}
|
|
#endif
|
|
else if (memcmp(myans, hisans, mylen))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifndef NODES
|
|
static int
|
|
chap_HaveAnotherGo(struct chap *chap)
|
|
{
|
|
if (++chap->peertries < 3) {
|
|
/* Give the peer another shot */
|
|
*chap->challenge.local = '\0';
|
|
chap_Challenge(&chap->auth);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
chap_Init(struct chap *chap, struct physical *p)
|
|
{
|
|
chap->desc.type = CHAP_DESCRIPTOR;
|
|
chap->desc.UpdateSet = chap_UpdateSet;
|
|
chap->desc.IsSet = chap_IsSet;
|
|
chap->desc.Read = chap_Read;
|
|
chap->desc.Write = chap_Write;
|
|
chap->child.pid = 0;
|
|
chap->child.fd = -1;
|
|
auth_Init(&chap->auth, p, chap_Challenge, chap_Success, chap_Failure);
|
|
*chap->challenge.local = *chap->challenge.peer = '\0';
|
|
#ifndef NODES
|
|
chap->NTRespSent = 0;
|
|
chap->peertries = 0;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
chap_ReInit(struct chap *chap)
|
|
{
|
|
chap_Cleanup(chap, SIGTERM);
|
|
}
|
|
|
|
struct mbuf *
|
|
chap_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
|
|
{
|
|
struct physical *p = link2physical(l);
|
|
struct chap *chap = &p->dl->chap;
|
|
char *name, *key, *ans;
|
|
int len, nlen;
|
|
u_char alen;
|
|
#ifndef NODES
|
|
int lanman;
|
|
#endif
|
|
|
|
if (p == NULL) {
|
|
log_Printf(LogERROR, "chap_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 chap input - dropped !\n");
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
|
|
m_settype(bp, MB_CHAPIN);
|
|
if ((bp = auth_ReadHeader(&chap->auth, bp)) == NULL &&
|
|
ntohs(chap->auth.in.hdr.length) == 0)
|
|
log_Printf(LogWARN, "Chap Input: Truncated header !\n");
|
|
else if (chap->auth.in.hdr.code == 0 || chap->auth.in.hdr.code > MAXCHAPCODE)
|
|
log_Printf(LogPHASE, "Chap Input: %d: Bad CHAP code !\n",
|
|
chap->auth.in.hdr.code);
|
|
else {
|
|
len = m_length(bp);
|
|
ans = NULL;
|
|
|
|
if (chap->auth.in.hdr.code != CHAP_CHALLENGE &&
|
|
chap->auth.id != chap->auth.in.hdr.id &&
|
|
Enabled(bundle, OPT_IDCHECK)) {
|
|
/* Wrong conversation dude ! */
|
|
log_Printf(LogPHASE, "Chap Input: %s dropped (got id %d, not %d)\n",
|
|
chapcodes[chap->auth.in.hdr.code], chap->auth.in.hdr.id,
|
|
chap->auth.id);
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
chap->auth.id = chap->auth.in.hdr.id; /* We respond with this id */
|
|
|
|
#ifndef NODES
|
|
lanman = 0;
|
|
#endif
|
|
switch (chap->auth.in.hdr.code) {
|
|
case CHAP_CHALLENGE:
|
|
bp = mbuf_Read(bp, &alen, 1);
|
|
len -= alen + 1;
|
|
if (len < 0) {
|
|
log_Printf(LogERROR, "Chap Input: Truncated challenge !\n");
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
*chap->challenge.peer = alen;
|
|
bp = mbuf_Read(bp, chap->challenge.peer + 1, alen);
|
|
bp = auth_ReadName(&chap->auth, bp, len);
|
|
#ifndef NODES
|
|
lanman = p->link.lcp.his_authtype == 0x80 &&
|
|
((chap->NTRespSent && IsAccepted(p->link.lcp.cfg.chap80lm)) ||
|
|
!IsAccepted(p->link.lcp.cfg.chap80nt));
|
|
|
|
/* Generate local challenge value */
|
|
chap_ChallengeInit(&chap->auth);
|
|
#endif
|
|
break;
|
|
|
|
case CHAP_RESPONSE:
|
|
auth_StopTimer(&chap->auth);
|
|
bp = mbuf_Read(bp, &alen, 1);
|
|
len -= alen + 1;
|
|
if (len < 0) {
|
|
log_Printf(LogERROR, "Chap Input: Truncated response !\n");
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
if ((ans = malloc(alen + 1)) == NULL) {
|
|
log_Printf(LogERROR, "Chap Input: Out of memory !\n");
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
*ans = chap->auth.id;
|
|
bp = mbuf_Read(bp, ans + 1, alen);
|
|
bp = auth_ReadName(&chap->auth, bp, len);
|
|
#ifndef NODES
|
|
lanman = p->link.lcp.want_authtype == 0x80 &&
|
|
alen == 49 && ans[alen] == 0;
|
|
#endif
|
|
break;
|
|
|
|
case CHAP_SUCCESS:
|
|
case CHAP_FAILURE:
|
|
/* chap->auth.in.name is already set up at CHALLENGE time */
|
|
if ((ans = malloc(len + 1)) == NULL) {
|
|
log_Printf(LogERROR, "Chap Input: Out of memory !\n");
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|
|
bp = mbuf_Read(bp, ans, len);
|
|
ans[len] = '\0';
|
|
break;
|
|
}
|
|
|
|
switch (chap->auth.in.hdr.code) {
|
|
case CHAP_CHALLENGE:
|
|
case CHAP_RESPONSE:
|
|
if (*chap->auth.in.name)
|
|
log_Printf(LogPHASE, "Chap Input: %s (%d bytes from %s%s)\n",
|
|
chapcodes[chap->auth.in.hdr.code], alen,
|
|
chap->auth.in.name,
|
|
#ifndef NODES
|
|
lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ?
|
|
" - lanman" :
|
|
#endif
|
|
"");
|
|
else
|
|
log_Printf(LogPHASE, "Chap Input: %s (%d bytes%s)\n",
|
|
chapcodes[chap->auth.in.hdr.code], alen,
|
|
#ifndef NODES
|
|
lanman && chap->auth.in.hdr.code == CHAP_RESPONSE ?
|
|
" - lanman" :
|
|
#endif
|
|
"");
|
|
break;
|
|
|
|
case CHAP_SUCCESS:
|
|
case CHAP_FAILURE:
|
|
if (*ans)
|
|
log_Printf(LogPHASE, "Chap Input: %s (%s)\n",
|
|
chapcodes[chap->auth.in.hdr.code], ans);
|
|
else
|
|
log_Printf(LogPHASE, "Chap Input: %s\n",
|
|
chapcodes[chap->auth.in.hdr.code]);
|
|
break;
|
|
}
|
|
|
|
switch (chap->auth.in.hdr.code) {
|
|
case CHAP_CHALLENGE:
|
|
if (*bundle->cfg.auth.key == '!' && bundle->cfg.auth.key[1] != '!')
|
|
chap_StartChild(chap, bundle->cfg.auth.key + 1,
|
|
bundle->cfg.auth.name);
|
|
else
|
|
chap_Respond(chap, bundle->cfg.auth.name, bundle->cfg.auth.key +
|
|
(*bundle->cfg.auth.key == '!' ? 1 : 0),
|
|
p->link.lcp.his_authtype
|
|
#ifndef NODES
|
|
, lanman
|
|
#endif
|
|
);
|
|
break;
|
|
|
|
case CHAP_RESPONSE:
|
|
name = chap->auth.in.name;
|
|
nlen = strlen(name);
|
|
#ifndef NODES
|
|
if (p->link.lcp.want_authtype == 0x81) {
|
|
struct MSCHAPv2_resp *resp = (struct MSCHAPv2_resp *)(ans + 1);
|
|
|
|
chap->challenge.peer[0] = sizeof resp->PeerChallenge;
|
|
memcpy(chap->challenge.peer + 1, resp->PeerChallenge,
|
|
sizeof resp->PeerChallenge);
|
|
}
|
|
#endif
|
|
|
|
#ifndef NORADIUS
|
|
if (*bundle->radius.cfg.file) {
|
|
if (!radius_Authenticate(&bundle->radius, &chap->auth,
|
|
chap->auth.in.name, ans, alen + 1,
|
|
chap->challenge.local + 1,
|
|
*chap->challenge.local))
|
|
chap_Failure(&chap->auth);
|
|
} else
|
|
#endif
|
|
{
|
|
if (p->link.lcp.want_authtype == 0x81 && ans[alen] != '\0' &&
|
|
alen == sizeof(struct MSCHAPv2_resp)) {
|
|
struct MSCHAPv2_resp *resp = (struct MSCHAPv2_resp *)(ans + 1);
|
|
|
|
log_Printf(LogWARN, "%s: Compensating for corrupt (Win98/WinME?) "
|
|
"CHAP81 RESPONSE\n", l->name);
|
|
resp->Flags = '\0'; /* rfc2759 says it *MUST* be zero */
|
|
}
|
|
key = auth_GetSecret(bundle, name, nlen, p);
|
|
if (key) {
|
|
#ifndef NODES
|
|
if (p->link.lcp.want_authtype == 0x80 &&
|
|
lanman && !IsEnabled(p->link.lcp.cfg.chap80lm)) {
|
|
log_Printf(LogPHASE, "Auth failure: LANMan not enabled\n");
|
|
if (chap_HaveAnotherGo(chap))
|
|
break;
|
|
key = NULL;
|
|
} else if (p->link.lcp.want_authtype == 0x80 &&
|
|
!lanman && !IsEnabled(p->link.lcp.cfg.chap80nt)) {
|
|
log_Printf(LogPHASE, "Auth failure: mschap not enabled\n");
|
|
if (chap_HaveAnotherGo(chap))
|
|
break;
|
|
key = NULL;
|
|
} else if (p->link.lcp.want_authtype == 0x81 &&
|
|
!IsEnabled(p->link.lcp.cfg.chap81)) {
|
|
log_Printf(LogPHASE, "Auth failure: CHAP81 not enabled\n");
|
|
key = NULL;
|
|
} else
|
|
#endif
|
|
{
|
|
char *myans = chap_BuildAnswer(name, key, chap->auth.id,
|
|
chap->challenge.local,
|
|
p->link.lcp.want_authtype
|
|
#ifndef NODES
|
|
, chap->challenge.peer,
|
|
chap->authresponse, lanman);
|
|
MPPE_IsServer = 1; /* XXX Global ! */
|
|
#else
|
|
);
|
|
#endif
|
|
if (myans == NULL)
|
|
key = NULL;
|
|
else {
|
|
if (!chap_Cmp(p->link.lcp.want_authtype, myans + 1, *myans,
|
|
ans + 1, alen
|
|
#ifndef NODES
|
|
, lanman
|
|
#endif
|
|
))
|
|
key = NULL;
|
|
free(myans);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (key)
|
|
chap_Success(&chap->auth);
|
|
else
|
|
chap_Failure(&chap->auth);
|
|
}
|
|
|
|
break;
|
|
|
|
case CHAP_SUCCESS:
|
|
if (p->link.lcp.auth_iwait == PROTO_CHAP) {
|
|
p->link.lcp.auth_iwait = 0;
|
|
if (p->link.lcp.auth_ineed == 0) {
|
|
#ifndef NODES
|
|
if (p->link.lcp.his_authtype == 0x81) {
|
|
if (strncmp(ans, chap->authresponse, 42)) {
|
|
datalink_AuthNotOk(p->dl);
|
|
log_Printf(LogWARN, "CHAP81: AuthenticatorResponse: (%.42s)"
|
|
" != ans: (%.42s)\n", chap->authresponse, ans);
|
|
|
|
} else {
|
|
/* Successful login */
|
|
MPPE_MasterKeyValid = 1; /* XXX Global ! */
|
|
datalink_AuthOk(p->dl);
|
|
}
|
|
} else
|
|
#endif
|
|
/*
|
|
* 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 CHAP_FAILURE:
|
|
datalink_AuthNotOk(p->dl);
|
|
break;
|
|
}
|
|
free(ans);
|
|
}
|
|
|
|
m_freem(bp);
|
|
return NULL;
|
|
}
|