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freebsd-nq/usr.sbin/ppp/chap.c
Brian Somers 057f1760a8 Make ppp WARNS=5 clean
2004-09-05 01:46:52 +00:00

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/*-
* 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 <ctype.h>
#include <errno.h>
#include <fcntl.h>
#ifndef NODES
#include <md4.h>
#endif
#include <md5.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "proto.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "auth.h"
#include "async.h"
#include "throughput.h"
#include "descriptor.h"
#include "chap.h"
#include "iplist.h"
#include "slcompress.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "filter.h"
#include "ccp.h"
#include "link.h"
#include "physical.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "chat.h"
#include "cbcp.h"
#include "command.h"
#include "datalink.h"
#ifndef NODES
#include "chap_ms.h"
#include "mppe.h"
#endif
#include "id.h"
static const char * const chapcodes[] = {
"???", "CHALLENGE", "RESPONSE", "SUCCESS", "FAILURE"
};
#define MAXCHAPCODE (sizeof chapcodes / sizeof chapcodes[0] - 1)
static void
ChapOutput(struct physical *physical, u_int code, u_int id,
const u_char *ptr, int count, const char *text)
{
int plen;
struct fsmheader lh;
struct mbuf *bp;
plen = sizeof(struct fsmheader) + count;
lh.code = code;
lh.id = id;
lh.length = htons(plen);
bp = m_get(plen, MB_CHAPOUT);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
if (count)
memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count);
log_DumpBp(LogDEBUG, "ChapOutput", bp);
if (text == NULL)
log_Printf(LogPHASE, "Chap Output: %s\n", chapcodes[code]);
else
log_Printf(LogPHASE, "Chap Output: %s (%s)\n", chapcodes[code], text);
link_PushPacket(&physical->link, bp, physical->dl->bundle,
LINK_QUEUES(&physical->link) - 1, PROTO_CHAP);
}
static char *
chap_BuildAnswer(char *name, char *key, u_char id, char *challenge
#ifndef NODES
, u_char type, char *peerchallenge, char *authresponse,
int lanman
#endif
)
{
char *result, *digest;
size_t nlen, klen;
nlen = strlen(name);
klen = strlen(key);
#ifndef NODES
if (type == 0x80) {
char expkey[AUTHLEN << 2];
MD4_CTX MD4context;
size_t f;
if ((result = malloc(1 + nlen + MS_CHAP_RESPONSE_LEN)) == NULL)
return result;
digest = result; /* the response */
*digest++ = MS_CHAP_RESPONSE_LEN; /* 49 */
memcpy(digest + MS_CHAP_RESPONSE_LEN, name, nlen);
if (lanman) {
memset(digest + 24, '\0', 25);
mschap_LANMan(digest, challenge + 1, key); /* LANMan response */
} else {
memset(digest, '\0', 25);
digest += 24;
for (f = 0; f < klen; f++) {
expkey[2*f] = key[f];
expkey[2*f+1] = '\0';
}
/*
* -----------
* expkey = | k\0e\0y\0 |
* -----------
*/
MD4Init(&MD4context);
MD4Update(&MD4context, expkey, klen << 1);
MD4Final(digest, &MD4context);
/*
* ---- -------- ---------------- ------- ------
* result = | 49 | LANMan | 16 byte digest | 9 * ? | name |
* ---- -------- ---------------- ------- ------
*/
mschap_NT(digest, challenge + 1);
}
/*
* ---- -------- ------------- ----- ------
* | | struct MS_ChapResponse24 | |
* result = | 49 | LANMan | NT digest | 0/1 | name |
* ---- -------- ------------- ----- ------
* where only one of LANMan & NT digest are set.
*/
} else if (type == 0x81) {
char expkey[AUTHLEN << 2];
char pwdhash[CHAP81_HASH_LEN];
char pwdhashhash[CHAP81_HASH_LEN];
char *ntresponse;
size_t f;
if ((result = malloc(1 + nlen + CHAP81_RESPONSE_LEN)) == NULL)
return result;
memset(result, 0, 1 + nlen + CHAP81_RESPONSE_LEN);
digest = result;
*digest++ = CHAP81_RESPONSE_LEN; /* value size */
/* Copy our challenge */
memcpy(digest, peerchallenge + 1, CHAP81_CHALLENGE_LEN);
/* Expand password to Unicode XXX */
for (f = 0; f < klen; f++) {
expkey[2*f] = key[f];
expkey[2*f+1] = '\0';
}
ntresponse = digest + CHAP81_NTRESPONSE_OFF;
/* Get some needed hashes */
NtPasswordHash(expkey, klen * 2, pwdhash);
HashNtPasswordHash(pwdhash, pwdhashhash);
/* Generate NTRESPONSE to respond on challenge call */
GenerateNTResponse(challenge + 1, peerchallenge + 1, name,
expkey, klen * 2, ntresponse);
/* Generate MPPE MASTERKEY */
GetMasterKey(pwdhashhash, ntresponse, MPPE_MasterKey); /* XXX Global ! */
/* Generate AUTHRESPONSE to verify on auth success */
GenerateAuthenticatorResponse(expkey, klen * 2, ntresponse,
peerchallenge + 1, challenge + 1, name,
authresponse);
authresponse[CHAP81_AUTHRESPONSE_LEN] = 0;
memcpy(digest + CHAP81_RESPONSE_LEN, name, nlen);
} else
#endif
if ((result = malloc(nlen + 17)) != NULL) {
/* Normal MD5 stuff */
MD5_CTX MD5context;
digest = result;
*digest++ = 16; /* value size */
MD5Init(&MD5context);
MD5Update(&MD5context, &id, 1);
MD5Update(&MD5context, key, klen);
MD5Update(&MD5context, challenge + 1, *challenge);
MD5Final(digest, &MD5context);
memcpy(digest + 16, name, nlen);
/*
* ---- -------- ------
* result = | 16 | digest | name |
* ---- -------- ------
*/
}
return result;
}
static void
chap_StartChild(struct chap *chap, char *prog, const char *name)
{
char *argv[MAXARGS], *nargv[MAXARGS];
int argc, fd;
int in[2], out[2];
pid_t pid;
if (chap->child.fd != -1) {
log_Printf(LogWARN, "Chap: %s: Program already running\n", prog);
return;
}
if (pipe(in) == -1) {
log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno));
return;
}
if (pipe(out) == -1) {
log_Printf(LogERROR, "Chap: pipe: %s\n", strerror(errno));
close(in[0]);
close(in[1]);
return;
}
pid = getpid();
switch ((chap->child.pid = fork())) {
case -1:
log_Printf(LogERROR, "Chap: fork: %s\n", strerror(errno));
close(in[0]);
close(in[1]);
close(out[0]);
close(out[1]);
chap->child.pid = 0;
return;
case 0:
timer_TermService();
if ((argc = command_Interpret(prog, strlen(prog), argv)) <= 0) {
if (argc < 0) {
log_Printf(LogWARN, "CHAP: Invalid command syntax\n");
_exit(255);
}
_exit(0);
}
close(in[1]);
close(out[0]);
if (out[1] == STDIN_FILENO)
out[1] = dup(out[1]);
dup2(in[0], STDIN_FILENO);
dup2(out[1], STDOUT_FILENO);
close(STDERR_FILENO);
if (open(_PATH_DEVNULL, O_RDWR) != STDERR_FILENO) {
log_Printf(LogALERT, "Chap: Failed to open %s: %s\n",
_PATH_DEVNULL, strerror(errno));
exit(1);
}
for (fd = getdtablesize(); fd > STDERR_FILENO; fd--)
fcntl(fd, F_SETFD, 1);
#ifndef NOSUID
setuid(ID0realuid());
#endif
command_Expand(nargv, argc, (char const *const *)argv,
chap->auth.physical->dl->bundle, 0, pid);
execvp(nargv[0], nargv);
printf("exec() of %s failed: %s\n", nargv[0], strerror(errno));
_exit(255);
default:
close(in[0]);
close(out[1]);
chap->child.fd = out[0];
chap->child.buf.len = 0;
write(in[1], chap->auth.in.name, strlen(chap->auth.in.name));
write(in[1], "\n", 1);
write(in[1], chap->challenge.peer + 1, *chap->challenge.peer);
write(in[1], "\n", 1);
write(in[1], name, strlen(name));
write(in[1], "\n", 1);
close(in[1]);
break;
}
}
static void
chap_Cleanup(struct chap *chap, int sig)
{
if (chap->child.pid) {
int status;
close(chap->child.fd);
chap->child.fd = -1;
if (sig)
kill(chap->child.pid, SIGTERM);
chap->child.pid = 0;
chap->child.buf.len = 0;
if (wait(&status) == -1)
log_Printf(LogERROR, "Chap: wait: %s\n", strerror(errno));
else if (WIFSIGNALED(status))
log_Printf(LogWARN, "Chap: Child received signal %d\n", WTERMSIG(status));
else if (WIFEXITED(status) && WEXITSTATUS(status))
log_Printf(LogERROR, "Chap: Child exited %d\n", WEXITSTATUS(status));
}
*chap->challenge.local = *chap->challenge.peer = '\0';
#ifndef NODES
chap->peertries = 0;
#endif
}
static void
chap_Respond(struct chap *chap, char *name, char *key
#ifndef NODES
, u_char type, int lm
#endif
)
{
u_char *ans;
ans = chap_BuildAnswer(name, key, chap->auth.id, chap->challenge.peer
#ifndef NODES
, type, chap->challenge.local, chap->authresponse, lm
#endif
);
if (ans) {
ChapOutput(chap->auth.physical, CHAP_RESPONSE, chap->auth.id,
ans, *ans + 1 + strlen(name), name);
#ifndef NODES
chap->NTRespSent = !lm;
MPPE_IsServer = 0; /* XXX Global ! */
#endif
free(ans);
} else
ChapOutput(chap->auth.physical, CHAP_FAILURE, chap->auth.id,
"Out of memory!", 14, NULL);
}
static int
chap_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w __unused,
fd_set *e __unused, int *n)
{
struct chap *chap = descriptor2chap(d);
if (r && chap && chap->child.fd != -1) {
FD_SET(chap->child.fd, r);
if (*n < chap->child.fd + 1)
*n = chap->child.fd + 1;
log_Printf(LogTIMER, "Chap: fdset(r) %d\n", chap->child.fd);
return 1;
}
return 0;
}
static int
chap_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct chap *chap = descriptor2chap(d);
return chap && chap->child.fd != -1 && FD_ISSET(chap->child.fd, fdset);
}
static void
chap_Read(struct fdescriptor *d, struct bundle *bundle __unused,
const fd_set *fdset __unused)
{
struct chap *chap = descriptor2chap(d);
int got;
got = read(chap->child.fd, chap->child.buf.ptr + chap->child.buf.len,
sizeof chap->child.buf.ptr - chap->child.buf.len - 1);
if (got == -1) {
log_Printf(LogERROR, "Chap: Read: %s\n", strerror(errno));
chap_Cleanup(chap, SIGTERM);
} else if (got == 0) {
log_Printf(LogWARN, "Chap: Read: Child terminated connection\n");
chap_Cleanup(chap, SIGTERM);
} else {
char *name, *key, *end;
chap->child.buf.len += got;
chap->child.buf.ptr[chap->child.buf.len] = '\0';
name = chap->child.buf.ptr;
name += strspn(name, " \t");
if ((key = strchr(name, '\n')) == NULL)
end = NULL;
else
end = strchr(++key, '\n');
if (end == NULL) {
if (chap->child.buf.len == sizeof chap->child.buf.ptr - 1) {
log_Printf(LogWARN, "Chap: Read: Input buffer overflow\n");
chap_Cleanup(chap, SIGTERM);
}
} else {
#ifndef NODES
int lanman = chap->auth.physical->link.lcp.his_authtype == 0x80 &&
((chap->NTRespSent &&
IsAccepted(chap->auth.physical->link.lcp.cfg.chap80lm)) ||
!IsAccepted(chap->auth.physical->link.lcp.cfg.chap80nt));
#endif
while (end >= name && strchr(" \t\r\n", *end))
*end-- = '\0';
end = key - 1;
while (end >= name && strchr(" \t\r\n", *end))
*end-- = '\0';
key += strspn(key, " \t");
chap_Respond(chap, name, key
#ifndef NODES
, chap->auth.physical->link.lcp.his_authtype, lanman
#endif
);
chap_Cleanup(chap, 0);
}
}
}
static int
chap_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused,
const fd_set *fdset __unused)
{
/* We never want to write here ! */
log_Printf(LogALERT, "chap_Write: Internal error: Bad call !\n");
return 0;
}
static void
chap_ChallengeInit(struct authinfo *authp)
{
struct chap *chap = auth2chap(authp);
int len, i;
char *cp;
len = strlen(authp->physical->dl->bundle->cfg.auth.name);
if (!*chap->challenge.local) {
randinit();
cp = chap->challenge.local;
#ifndef NORADIUS
if (*authp->physical->dl->bundle->radius.cfg.file) {
/* For radius, our challenge is 16 readable NUL terminated bytes :*/
*cp++ = 16;
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(char *myans, int mylen, char *hisans, int hislen
#ifndef NODES
, u_char type, int lm
#endif
)
{
int off;
if (mylen != hislen)
return 0;
off = 0;
#ifndef NODES
if (type == 0x80) {
off = lm ? 0 : 24;
mylen = 24;
}
#endif
for (; mylen; off++, mylen--)
if (toupper(myans[off]) != toupper(hisans[off]))
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;
size_t 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)
#ifndef NODES
, p->link.lcp.his_authtype, 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(name, nlen);
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
#ifndef NODES
, p->link.lcp.want_authtype,
chap->challenge.peer,
chap->authresponse, lanman);
MPPE_IsServer = 1; /* XXX Global ! */
#else
);
#endif
if (myans == NULL)
key = NULL;
else {
if (!chap_Cmp(myans + 1, *myans, ans + 1, alen
#ifndef NODES
, p->link.lcp.want_authtype, 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 (strncasecmp(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;
}
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