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/*
Unix SMB/Netbios implementation.
Version 1.9.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) Luke Kenneth Casson Leighton 1994-1998
Copyright (C) Jeremy Allison 1994-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Revision History:
*/
#include "includes.h"
extern int DEBUGLEVEL;
extern pstring global_myname;
extern fstring global_myworkgroup;
/****************************************************************************
Process a domain logon packet
**************************************************************************/
void process_logon_packet(struct packet_struct *p,char *buf,int len,
char *mailslot)
{
struct dgram_packet *dgram = &p->packet.dgram;
pstring my_name;
fstring reply_name;
pstring outbuf;
int code;
uint16 token = 0;
uint32 ntversion = 0;
uint16 lmnttoken = 0;
uint16 lm20token = 0;
uint32 domainsidsize;
BOOL short_request = False;
char *getdc;
char *uniuser; /* Unicode user name. */
pstring ascuser;
char *unicomp; /* Unicode computer name. */
memset(outbuf, 0, sizeof(outbuf));
if (!lp_domain_logons())
{
DEBUG(3,("process_logon_packet: Logon packet received from IP %s and domain \
logons are not enabled.\n", inet_ntoa(p->ip) ));
return;
}
pstrcpy(my_name, global_myname);
strupper(my_name);
code = SVAL(buf,0);
DEBUG(1,("process_logon_packet: Logon from %s: code = 0x%x\n", inet_ntoa(p->ip), code));
switch (code)
{
case 0:
{
char *q = buf + 2;
char *machine = q;
char *user = skip_string(machine,1);
getdc = skip_string(user,1);
q = skip_string(getdc,1);
token = SVAL(q,3);
fstrcpy(reply_name,my_name);
DEBUG(3,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
machine,inet_ntoa(p->ip),user,token));
q = outbuf;
SSVAL(q, 0, 6);
q += 2;
fstrcpy(reply_name, "\\\\");
fstrcat(reply_name, my_name);
fstrcpy(q, reply_name); q = skip_string(q, 1); /* PDC name */
SSVAL(q, 0, token);
q += 2;
dump_data(4, outbuf, PTR_DIFF(q, outbuf));
send_mailslot(True, getdc,
outbuf,PTR_DIFF(q,outbuf),
global_myname, 0x0,
machine,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
break;
}
case QUERYFORPDC:
{
char *q = buf + 2;
char *machine = q;
getdc = skip_string(machine,1);
q = skip_string(getdc,1);
q = ALIGN2(q, buf);
/* at this point we can work out if this is a W9X or NT style
request. Experiments show that the difference is wether the
packet ends here. For a W9X request we now end with a pair of
bytes (usually 0xFE 0xFF) whereas with NT we have two further
strings - the following is a simple way of detecting this */
if (len - PTR_DIFF(q, buf) <= 3) {
short_request = True;
} else {
unicomp = q;
/* A full length (NT style) request */
q = skip_unibuf(unicomp, PTR_DIFF(buf + len, unicomp));
if (len - PTR_DIFF(q, buf) > 8) {
/* with NT5 clients we can sometimes
get additional data - a length specificed string
containing the domain name, then 16 bytes of
data (no idea what it is) */
int dom_len = CVAL(q, 0);
q++;
if (dom_len != 0) {
q += dom_len + 1;
}
q += 16;
}
ntversion = IVAL(q, 0);
lmnttoken = SVAL(q, 4);
lm20token = SVAL(q, 6);
}
/* Construct reply. */
q = outbuf;
SSVAL(q, 0, QUERYFORPDC_R);
q += 2;
fstrcpy(reply_name,my_name);
fstrcpy(q, reply_name);
q = skip_string(q, 1); /* PDC name */
/* PDC and domain name */
if (!short_request) /* Make a full reply */
{
q = ALIGN2(q, outbuf);
q += dos_PutUniCode(q, my_name, sizeof(pstring), True); /* PDC name */
q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True); /* Domain name*/
SIVAL(q, 0, 1); /* our nt version */
SSVAL(q, 4, 0xffff); /* our lmnttoken */
SSVAL(q, 6, 0xffff); /* our lm20token */
q += 8;
}
/* RJS, 21-Feb-2000, we send a short reply if the request was short */
DEBUG(3,("process_logon_packet: GETDC request from %s at IP %s, \
reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
machine,inet_ntoa(p->ip), reply_name, global_myworkgroup,
QUERYFORPDC_R, (uint32)ntversion, (uint32)lmnttoken,
(uint32)lm20token ));
dump_data(4, outbuf, PTR_DIFF(q, outbuf));
send_mailslot(True, getdc,
outbuf,PTR_DIFF(q,outbuf),
global_myname, 0x0,
dgram->source_name.name,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
return;
}
case SAMLOGON:
{
char *q = buf + 2;
q += 2;
unicomp = q;
uniuser = skip_unibuf(unicomp, PTR_DIFF(buf+len, unicomp));
getdc = skip_unibuf(uniuser,PTR_DIFF(buf+len, uniuser));
q = skip_string(getdc,1);
q += 4; /* Account Control Bits - indicating username type */
domainsidsize = IVAL(q, 0);
q += 4;
DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d, len = %d\n", domainsidsize, len));
if (domainsidsize < (len - PTR_DIFF(q, buf)) && (domainsidsize != 0)) {
q += domainsidsize;
q = ALIGN4(q, buf);
}
DEBUG(3,("process_logon_packet: len = %d PTR_DIFF(q, buf) = %d\n", len, PTR_DIFF(q, buf) ));
if (len - PTR_DIFF(q, buf) > 8) {
/* with NT5 clients we can sometimes
get additional data - a length specificed string
containing the domain name, then 16 bytes of
data (no idea what it is) */
int dom_len = CVAL(q, 0);
q++;
if (dom_len < (len - PTR_DIFF(q, buf)) && (dom_len != 0)) {
q += dom_len + 1;
}
q += 16;
}
ntversion = IVAL(q, 0);
lmnttoken = SVAL(q, 4);
lm20token = SVAL(q, 6);
q += 8;
DEBUG(3,("process_logon_packet: SAMLOGON sidsize %d ntv %d\n", domainsidsize, ntversion));
/*
* we respond regadless of whether the machine is in our password
* database. If it isn't then we let smbd send an appropriate error.
* Let's ignore the SID.
*/
pstrcpy(ascuser, dos_unistr(uniuser));
DEBUG(3,("process_logon_packet: SAMLOGON user %s\n", ascuser));
fstrcpy(reply_name,"\\\\"); /* Here it wants \\LOGONSERVER. */
fstrcpy(reply_name+2,my_name);
DEBUG(3,("process_logon_packet: SAMLOGON request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
dos_unistr(unicomp),inet_ntoa(p->ip), ascuser, reply_name, global_myworkgroup,
SAMLOGON_R ,lmnttoken));
/* Construct reply. */
q = outbuf;
if (SVAL(uniuser, 0) == 0) {
SSVAL(q, 0, SAMLOGON_UNK_R); /* user unknown */
} else {
SSVAL(q, 0, SAMLOGON_R);
}
q += 2;
q += dos_PutUniCode(q, reply_name,sizeof(pstring), True);
q += dos_PutUniCode(q, ascuser, sizeof(pstring), True);
q += dos_PutUniCode(q, global_myworkgroup,sizeof(pstring), True);
/* tell the client what version we are */
SIVAL(q, 0, 1); /* our ntversion */
SSVAL(q, 4, 0xffff); /* our lmnttoken */
SSVAL(q, 6, 0xffff); /* our lm20token */
q += 8;
dump_data(4, outbuf, PTR_DIFF(q, outbuf));
send_mailslot(True, getdc,
outbuf,PTR_DIFF(q,outbuf),
global_myname, 0x0,
dgram->source_name.name,
dgram->source_name.name_type,
p->ip, *iface_ip(p->ip), p->port);
break;
}
default:
{
DEBUG(3,("process_logon_packet: Unknown domain request %d\n",code));
return;
}
}
}
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