2011-03-30 12:46:40 +00:00
|
|
|
/*
|
|
|
|
* Beware the LM hash is easy to crack (google for l0phtCrack)
|
|
|
|
* and though NTLM is more secure it is still breakable.
|
|
|
|
* Ntlmv2 is better and seen as good enough by the windows community.
|
|
|
|
* For real security use kerberos.
|
|
|
|
*/
|
|
|
|
#include <u.h>
|
|
|
|
#include <libc.h>
|
|
|
|
#include <mp.h>
|
|
|
|
#include <auth.h>
|
|
|
|
#include <libsec.h>
|
|
|
|
#include <ctype.h>
|
|
|
|
#include <fcall.h>
|
|
|
|
#include <thread.h>
|
|
|
|
#include <9p.h>
|
|
|
|
#include "cifs.h"
|
|
|
|
|
|
|
|
#define DEF_AUTH "ntlmv2"
|
|
|
|
|
|
|
|
static enum {
|
|
|
|
MACkeylen = 40, /* MAC key len */
|
|
|
|
MAClen = 8, /* signature length */
|
|
|
|
MACoff = 14, /* sign. offset from start of SMB (not netbios) pkt */
|
|
|
|
};
|
|
|
|
|
2016-11-17 01:59:40 +00:00
|
|
|
#ifdef DEBUG_MAC
|
2011-03-30 12:46:40 +00:00
|
|
|
static void
|
|
|
|
dmp(char *s, int seq, void *buf, int n)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
char *p = buf;
|
|
|
|
|
|
|
|
print("%s %3d ", s, seq);
|
|
|
|
while(n > 0){
|
|
|
|
for(i = 0; i < 16 && n > 0; i++, n--)
|
|
|
|
print("%02x ", *p++ & 0xff);
|
|
|
|
if(n > 0)
|
|
|
|
print("\n");
|
|
|
|
}
|
|
|
|
print("\n");
|
|
|
|
}
|
2016-11-17 01:59:40 +00:00
|
|
|
#endif
|
2011-03-30 12:46:40 +00:00
|
|
|
|
|
|
|
static Auth *
|
|
|
|
auth_plain(char *windom, char *keyp, uchar *chal, int len)
|
|
|
|
{
|
|
|
|
UserPasswd *up;
|
|
|
|
static Auth *ap;
|
|
|
|
|
|
|
|
USED(chal, len);
|
|
|
|
|
|
|
|
up = auth_getuserpasswd(auth_getkey, "windom=%s proto=pass service=cifs %s",
|
|
|
|
windom, keyp);
|
|
|
|
if(! up)
|
|
|
|
sysfatal("cannot get key - %r");
|
|
|
|
|
|
|
|
ap = emalloc9p(sizeof(Auth));
|
|
|
|
memset(ap, 0, sizeof(ap));
|
|
|
|
ap->user = estrdup9p(up->user);
|
|
|
|
ap->windom = estrdup9p(windom);
|
|
|
|
|
|
|
|
ap->resp[0] = estrdup9p(up->passwd);
|
|
|
|
ap->len[0] = strlen(up->passwd);
|
|
|
|
memset(up->passwd, 0, strlen(up->passwd));
|
|
|
|
free(up);
|
|
|
|
|
|
|
|
return ap;
|
|
|
|
}
|
|
|
|
|
|
|
|
static Auth *
|
2013-12-11 04:48:48 +00:00
|
|
|
auth_proto(char *proto, char *windom, char *keyp, uchar *chal, int len)
|
2011-03-30 12:46:40 +00:00
|
|
|
{
|
2013-12-11 04:48:48 +00:00
|
|
|
MSchapreply *mcr;
|
|
|
|
uchar resp[4096];
|
|
|
|
int nresp;
|
2011-03-30 12:46:40 +00:00
|
|
|
char user[64];
|
|
|
|
Auth *ap;
|
|
|
|
|
2013-12-11 04:48:48 +00:00
|
|
|
mcr = (MSchapreply*)resp;
|
|
|
|
nresp = sizeof(resp);
|
|
|
|
nresp = auth_respond(chal, len, user, sizeof user, resp, nresp,
|
|
|
|
auth_getkey, "proto=%s role=client service=cifs windom=%s %s",
|
|
|
|
proto, windom, keyp);
|
|
|
|
if(nresp < 0)
|
|
|
|
sysfatal("cannot get response - %r");
|
|
|
|
if(nresp < sizeof(*mcr))
|
|
|
|
sysfatal("bad response size");
|
2011-03-30 12:46:40 +00:00
|
|
|
|
|
|
|
ap = emalloc9p(sizeof(Auth));
|
|
|
|
memset(ap, 0, sizeof(ap));
|
|
|
|
ap->user = estrdup9p(user);
|
|
|
|
ap->windom = estrdup9p(windom);
|
|
|
|
|
|
|
|
/* LM response */
|
2013-12-11 04:48:48 +00:00
|
|
|
ap->len[0] = sizeof(mcr->LMresp);
|
2011-03-30 12:46:40 +00:00
|
|
|
ap->resp[0] = emalloc9p(ap->len[0]);
|
2013-12-11 04:48:48 +00:00
|
|
|
memcpy(ap->resp[0], mcr->LMresp, ap->len[0]);
|
2011-03-30 12:46:40 +00:00
|
|
|
|
2013-12-11 04:48:48 +00:00
|
|
|
/* NT response */
|
|
|
|
ap->len[1] = nresp+sizeof(mcr->NTresp)-sizeof(*mcr);
|
2011-03-30 12:46:40 +00:00
|
|
|
ap->resp[1] = emalloc9p(ap->len[1]);
|
2013-12-11 04:48:48 +00:00
|
|
|
memcpy(ap->resp[1], mcr->NTresp, ap->len[1]);
|
2011-03-30 12:46:40 +00:00
|
|
|
|
|
|
|
return ap;
|
|
|
|
}
|
|
|
|
|
2013-12-11 04:48:48 +00:00
|
|
|
static Auth *
|
|
|
|
auth_lm_and_ntlm(char *windom, char *keyp, uchar *chal, int len)
|
|
|
|
{
|
2018-05-20 20:49:24 +00:00
|
|
|
return auth_proto("ntlm", windom, keyp, chal, len);
|
2013-12-11 04:48:48 +00:00
|
|
|
}
|
|
|
|
|
2011-03-30 12:46:40 +00:00
|
|
|
/*
|
|
|
|
* NTLM response only, the LM response is a just
|
|
|
|
* copy of the NTLM one. we do this because the lm
|
|
|
|
* response is easily reversed - Google for l0pht
|
|
|
|
* for more info.
|
|
|
|
*/
|
|
|
|
static Auth *
|
|
|
|
auth_ntlm(char *windom, char *keyp, uchar *chal, int len)
|
|
|
|
{
|
|
|
|
Auth *ap;
|
|
|
|
|
|
|
|
if((ap = auth_lm_and_ntlm(windom, keyp, chal, len)) == nil)
|
|
|
|
return nil;
|
|
|
|
|
|
|
|
free(ap->resp[0]);
|
|
|
|
ap->len[0] = ap->len[1];
|
|
|
|
ap->resp[0] = emalloc9p(ap->len[0]);
|
|
|
|
memcpy(ap->resp[0], ap->resp[1], ap->len[0]);
|
|
|
|
return ap;
|
|
|
|
}
|
|
|
|
|
|
|
|
static Auth *
|
|
|
|
auth_ntlmv2(char *windom, char *keyp, uchar *chal, int len)
|
|
|
|
{
|
2018-05-20 20:49:24 +00:00
|
|
|
return auth_proto("ntlmv2", windom, keyp, chal, len);
|
2011-03-30 12:46:40 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
struct {
|
|
|
|
char *name;
|
|
|
|
Auth *(*func)(char *, char *, uchar *, int);
|
|
|
|
} methods[] = {
|
|
|
|
{ "plain", auth_plain },
|
|
|
|
{ "lm+ntlm", auth_lm_and_ntlm },
|
|
|
|
{ "ntlm", auth_ntlm },
|
|
|
|
{ "ntlmv2", auth_ntlmv2 },
|
|
|
|
// { "kerberos", auth_kerberos },
|
|
|
|
};
|
|
|
|
|
|
|
|
void
|
|
|
|
autherr(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
fprint(2, "supported auth methods:\t");
|
|
|
|
for(i = 0; i < nelem(methods); i++)
|
|
|
|
fprint(2, "%s ", methods[i].name);
|
|
|
|
fprint(2, "\n");
|
|
|
|
exits("usage");
|
|
|
|
}
|
|
|
|
|
|
|
|
Auth *
|
|
|
|
getauth(char *name, char *windom, char *keyp, int secmode, uchar *chal, int len)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
Auth *ap;
|
|
|
|
|
|
|
|
if(name == nil){
|
|
|
|
name = DEF_AUTH;
|
|
|
|
if((secmode & SECMODE_PW_ENCRYPT) == 0)
|
|
|
|
sysfatal("plaintext authentication required, use '-a plain'");
|
|
|
|
}
|
|
|
|
|
|
|
|
ap = nil;
|
|
|
|
for(i = 0; i < nelem(methods); i++)
|
|
|
|
if(strcmp(methods[i].name, name) == 0){
|
|
|
|
ap = methods[i].func(windom, keyp, chal, len);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(! ap){
|
|
|
|
fprint(2, "%s: %s - unknown auth method\n", argv0, name);
|
|
|
|
autherr(); /* never returns */
|
|
|
|
}
|
|
|
|
return ap;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
genmac(uchar *buf, int len, int seq, uchar key[MACkeylen], uchar ours[MAClen])
|
|
|
|
{
|
|
|
|
DigestState *ds;
|
|
|
|
uchar *sig, digest[MD5dlen], theirs[MAClen];
|
|
|
|
|
|
|
|
sig = buf+MACoff;
|
|
|
|
memcpy(theirs, sig, MAClen);
|
|
|
|
|
|
|
|
memset(sig, 0, MAClen);
|
|
|
|
sig[0] = seq;
|
|
|
|
sig[1] = seq >> 8;
|
|
|
|
sig[2] = seq >> 16;
|
|
|
|
sig[3] = seq >> 24;
|
|
|
|
|
|
|
|
ds = md5(key, MACkeylen, nil, nil);
|
|
|
|
md5(buf, len, digest, ds);
|
|
|
|
memcpy(ours, digest, MAClen);
|
|
|
|
|
|
|
|
return memcmp(theirs, ours, MAClen);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
macsign(Pkt *p, int seq)
|
|
|
|
{
|
|
|
|
int rc, len;
|
|
|
|
uchar *sig, *buf, mac[MAClen];
|
|
|
|
|
|
|
|
sig = p->buf + NBHDRLEN + MACoff;
|
|
|
|
buf = p->buf + NBHDRLEN;
|
|
|
|
len = (p->pos - p->buf) - NBHDRLEN;
|
|
|
|
|
|
|
|
#ifdef DEBUG_MAC
|
|
|
|
if(seq & 1)
|
|
|
|
dmp("rx", seq, sig, MAClen);
|
|
|
|
#endif
|
|
|
|
rc = 0;
|
|
|
|
if(! p->s->seqrun)
|
|
|
|
memcpy(mac, "BSRSPYL ", 8); /* no idea, ask MS */
|
|
|
|
else
|
|
|
|
rc = genmac(buf, len, seq, p->s->auth->mackey[0], mac);
|
|
|
|
#ifdef DEBUG_MAC
|
|
|
|
if(!(seq & 1))
|
|
|
|
dmp("tx", seq, mac, MAClen);
|
|
|
|
#endif
|
|
|
|
memcpy(sig, mac, MAClen);
|
|
|
|
return rc;
|
|
|
|
}
|