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/*
Unix SMB/Netbios implementation.
Version 1.9.
SMB client
Copyright (C) Andrew Tridgell 1994-1997
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.
*/
#ifdef SYSLOG
#undef SYSLOG
#endif
#include "includes.h"
extern int DEBUGLEVEL;
#define CLIENT_TIMEOUT (30*1000)
/****************************************************************************
do a LSA Request Challenge
****************************************************************************/
static BOOL do_lsa_req_chal(uint16 fnum,
char *desthost, char *myhostname, DOM_CHAL *srv_chal)
{
char *rparam = NULL;
char *rdata = NULL;
char *p;
int rdrcnt,rprcnt;
pstring data; /* only 1024 bytes */
uint16 setup[2]; /* only need 2 uint16 setup parameters */
LSA_Q_REQ_CHAL q_c;
DOM_CHAL clnt_chal;
int call_id = 0x1;
BOOL valid_chal = False;
if (srv_chal == NULL) return False;
/* create and send a MSRPC command with api LSA_REQCHAL */
clnt_chal.data[0] = 0x11111111;
clnt_chal.data[1] = 0x22222222;
DEBUG(4,("LSA Request Challenge from %s to %s: %lx %lx\n",
desthost, myhostname, clnt_chal.data[0], clnt_chal.data[1]));
/* store the parameters */
make_q_req_chal(&q_c, desthost, myhostname, &clnt_chal);
/* turn parameters into data stream */
p = lsa_io_q_req_chal(False, &q_c, data + 0x18, data, 4, 0);
/* create the request RPC_HDR _after_ the main data: length is now known */
create_rpc_request(call_id, LSA_REQCHAL, data, PTR_DIFF(p, data));
/* create setup parameters. */
SIVAL(setup, 0, 0x0026); /* 0x26 indicates "transact named pipe" */
SIVAL(setup, 2, fnum); /* file handle, from the SMBcreateX pipe, earlier */
/* send the data on \PIPE\ */
if (cli_call_api("\\PIPE\\", 0, PTR_DIFF(p, data), 2, 1024,
BUFFER_SIZE,
&rprcnt,&rdrcnt,
NULL, data, setup,
&rparam,&rdata))
{
LSA_R_REQ_CHAL r_c;
RPC_HDR hdr;
int hdr_len;
int pkt_len;
DEBUG(5, ("cli_call_api: return OK\n"));
p = rdata;
if (p) p = smb_io_rpc_hdr (True, &hdr, p, rdata, 4, 0);
if (p) p = align_offset(p, rdata, 4); /* oh, what a surprise */
hdr_len = PTR_DIFF(p, rdata);
if (p && hdr_len != hdr.frag_len - hdr.alloc_hint)
{
/* header length not same as calculated header length */
DEBUG(2,("do_lsa_req_chal: hdr_len %x != frag_len-alloc_hint\n",
hdr_len, hdr.frag_len - hdr.alloc_hint));
p = NULL;
}
if (p) p = lsa_io_r_req_chal(True, &r_c, p, rdata, 4, 0);
pkt_len = PTR_DIFF(p, rdata);
if (p && pkt_len != hdr.frag_len)
{
/* packet data size not same as reported fragment length */
DEBUG(2,("do_lsa_req_chal: pkt_len %x != frag_len \n",
pkt_len, hdr.frag_len));
p = NULL;
}
if (p && r_c.status != 0)
{
/* report error code */
DEBUG(0,("LSA_REQ_CHAL: nt_status error %lx\n", r_c.status));
p = NULL;
}
if (p)
{
/* ok, at last: we're happy. return the challenge */
memcpy(srv_chal, r_c.srv_chal.data, sizeof(srv_chal->data));
valid_chal = True;
}
}
if (rparam) free(rparam);
if (rdata) free(rdata);
return valid_chal;
}
/****************************************************************************
open an rpc pipe (\NETLOGON or \srvsvc for example)
****************************************************************************/
static uint16 open_rpc_pipe(char *inbuf, char *outbuf, char *rname, int Client, int cnum)
{
int fnum;
char *p;
DEBUG(5,("open_rpc_pipe: %s\n", rname));
bzero(outbuf,smb_size);
set_message(outbuf,15,1 + strlen(rname),True);
CVAL(outbuf,smb_com) = SMBopenX;
SSVAL(outbuf,smb_tid, cnum);
cli_setup_pkt(outbuf);
SSVAL(outbuf,smb_vwv0,0xFF);
SSVAL(outbuf,smb_vwv2,1);
SSVAL(outbuf,smb_vwv3,(DENY_NONE<<4));
SSVAL(outbuf,smb_vwv4,aSYSTEM | aHIDDEN);
SSVAL(outbuf,smb_vwv5,aSYSTEM | aHIDDEN);
SSVAL(outbuf,smb_vwv8,1);
p = smb_buf(outbuf);
strcpy(p,rname);
p = skip_string(p,1);
send_smb(Client,outbuf);
receive_smb(Client,inbuf,CLIENT_TIMEOUT);
if (CVAL(inbuf,smb_rcls) != 0)
{
if (CVAL(inbuf,smb_rcls) == ERRSRV &&
SVAL(inbuf,smb_err) == ERRnoresource &&
cli_reopen_connection(inbuf,outbuf))
{
return open_rpc_pipe(inbuf, outbuf, rname, Client, cnum);
}
DEBUG(0,("opening remote pipe %s - error %s\n", rname, smb_errstr(inbuf)));
return 0xffff;
}
fnum = SVAL(inbuf, smb_vwv2);
DEBUG(5,("opening pipe: fnum %d\n", fnum));
return fnum;
}
/****************************************************************************
****************************************************************************/
BOOL cli_lsa_req_chal(DOM_CHAL *srv_chal, char *desthost, char *myhostname,
int Client, int cnum)
{
uint16 fnum;
char *inbuf,*outbuf;
if (srv_chal == NULL) return False;
inbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
outbuf = (char *)malloc(BUFFER_SIZE + SAFETY_MARGIN);
if (!inbuf || !outbuf)
{
DEBUG(0,("out of memory\n"));
return False;
}
/* open the \PIPE\NETLOGON file */
fnum = open_rpc_pipe(inbuf, outbuf, PIPE_NETLOGON, Client, cnum);
if (fnum != 0xffff)
{
do_lsa_req_chal(fnum, desthost, myhostname, srv_chal);
/* close \PIPE\NETLOGON */
cli_smb_close(inbuf, outbuf, Client, cnum, fnum);
free(inbuf); free(outbuf);
return True;
}
return False;
}
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