samba-mirror/source3/libsmb/cliconnect.c

/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   client connect/disconnect routines
   Copyright (C) Andrew Tridgell 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.
*/

#define NO_SYSLOG

#include "includes.h"


static const struct {
    int prot;
    const char *name;
  }
prots[] = 
    {
      {PROTOCOL_CORE,"PC NETWORK PROGRAM 1.0"},
      {PROTOCOL_COREPLUS,"MICROSOFT NETWORKS 1.03"},
      {PROTOCOL_LANMAN1,"MICROSOFT NETWORKS 3.0"},
      {PROTOCOL_LANMAN1,"LANMAN1.0"},
      {PROTOCOL_LANMAN2,"LM1.2X002"},
      {PROTOCOL_LANMAN2,"Samba"},
      {PROTOCOL_NT1,"NT LANMAN 1.0"},
      {PROTOCOL_NT1,"NT LM 0.12"},
      {-1,NULL}
    };


/****************************************************************************
do an old lanman2 style session setup
****************************************************************************/
static BOOL cli_session_setup_lanman2(struct cli_state *cli, char *user, 
				      char *pass, int passlen)
{
	fstring pword;
	char *p;

	if (passlen > sizeof(pword)-1) {
		return False;
	}

	/* if in share level security then don't send a password now */
	if (!(cli->sec_mode & 1)) {
		passlen = 0;
	}

	if (passlen > 0 && (cli->sec_mode & 2) && passlen != 24) {
		/* Encrypted mode needed, and non encrypted password supplied. */
		passlen = 24;
		clistr_push(cli, pword, pass, -1, STR_TERMINATE);
		SMBencrypt((uchar *)pword,cli->secblob.data,(uchar *)pword);
	} else if ((cli->sec_mode & 2) && passlen == 24) {
		/* Encrypted mode needed, and encrypted password supplied. */
		memcpy(pword, pass, passlen);
	} else if (passlen > 0) {
		/* Plaintext mode needed, assume plaintext supplied. */
		passlen = clistr_push(cli, pword, pass, -1, STR_TERMINATE);
	}

	/* send a session setup command */
	memset(cli->outbuf,'\0',smb_size);
	set_message(cli->outbuf,10, 0, True);
	CVAL(cli->outbuf,smb_com) = SMBsesssetupX;
	cli_setup_packet(cli);
	
	CVAL(cli->outbuf,smb_vwv0) = 0xFF;
	SSVAL(cli->outbuf,smb_vwv2,cli->max_xmit);
	SSVAL(cli->outbuf,smb_vwv3,2);
	SSVAL(cli->outbuf,smb_vwv4,1);
	SIVAL(cli->outbuf,smb_vwv5,cli->sesskey);
	SSVAL(cli->outbuf,smb_vwv7,passlen);

	p = smb_buf(cli->outbuf);
	memcpy(p,pword,passlen);
	p += passlen;
	p += clistr_push(cli, p, user, -1, STR_TERMINATE);
	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return False;

	show_msg(cli->inbuf);

	if (cli_is_error(cli)) {
		return False;
	}
	
	/* use the returned vuid from now on */
	cli->vuid = SVAL(cli->inbuf,smb_uid);	
	fstrcpy(cli->user_name, user);

	return True;
}


/****************************************************************************
work out suitable capabilities to offer the server
****************************************************************************/
static uint32 cli_session_setup_capabilities(struct cli_state *cli)
{
	uint32 capabilities = CAP_NT_SMBS;

	/* Set the CLI_FORCE_DOSERR environment variable to test
	   client routines using DOS errors instead of STATUS32
	   ones.  This intended only as a temporary hack. */	
	if (!getenv("CLI_FORCE_DOSERR")) {
		capabilities |= CAP_STATUS32;
	}

	if (cli->use_level_II_oplocks) {
		capabilities |= CAP_LEVEL_II_OPLOCKS;
	}

	if (cli->capabilities & CAP_UNICODE) {
		capabilities |= CAP_UNICODE;
	}

	return capabilities;
}


/****************************************************************************
do a NT1 guest session setup
****************************************************************************/
static BOOL cli_session_setup_guest(struct cli_state *cli)
{
	char *p;
	uint32 capabilities = cli_session_setup_capabilities(cli);

	set_message(cli->outbuf,13,0,True);
	CVAL(cli->outbuf,smb_com) = SMBsesssetupX;
	cli_setup_packet(cli);
			
	CVAL(cli->outbuf,smb_vwv0) = 0xFF;
	SSVAL(cli->outbuf,smb_vwv2,CLI_BUFFER_SIZE);
	SSVAL(cli->outbuf,smb_vwv3,2);
	SSVAL(cli->outbuf,smb_vwv4,cli->pid);
	SIVAL(cli->outbuf,smb_vwv5,cli->sesskey);
	SSVAL(cli->outbuf,smb_vwv7,0);
	SSVAL(cli->outbuf,smb_vwv8,0);
	SIVAL(cli->outbuf,smb_vwv11,capabilities); 
	p = smb_buf(cli->outbuf);
	p += clistr_push(cli, p, "", -1, STR_TERMINATE); /* username */
	p += clistr_push(cli, p, "", -1, STR_TERMINATE); /* workgroup */
	p += clistr_push(cli, p, "Unix", -1, STR_TERMINATE);
	p += clistr_push(cli, p, "Samba", -1, STR_TERMINATE);
	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
	      return False;
	
	show_msg(cli->inbuf);
	
	if (cli_is_error(cli)) {
		return False;
	}

	cli->vuid = SVAL(cli->inbuf,smb_uid);

	p = smb_buf(cli->inbuf);
	p += clistr_pull(cli, cli->server_os, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_type, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_domain, p, sizeof(fstring), -1, STR_TERMINATE);

	fstrcpy(cli->user_name, "");

	return True;
}


/****************************************************************************
do a NT1 plaintext session setup
****************************************************************************/
static BOOL cli_session_setup_plaintext(struct cli_state *cli, char *user, 
					char *pass, char *workgroup)
{
	uint32 capabilities = cli_session_setup_capabilities(cli);
	fstring pword;
	int passlen;
	char *p;

	passlen = clistr_push(cli, pword, pass, sizeof(pword), STR_TERMINATE);

	set_message(cli->outbuf,13,0,True);
	CVAL(cli->outbuf,smb_com) = SMBsesssetupX;
	cli_setup_packet(cli);
			
	CVAL(cli->outbuf,smb_vwv0) = 0xFF;
	SSVAL(cli->outbuf,smb_vwv2,CLI_BUFFER_SIZE);
	SSVAL(cli->outbuf,smb_vwv3,2);
	SSVAL(cli->outbuf,smb_vwv4,cli->pid);
	SIVAL(cli->outbuf,smb_vwv5,cli->sesskey);
	SSVAL(cli->outbuf,smb_vwv7,passlen);
	SSVAL(cli->outbuf,smb_vwv8,0);
	SIVAL(cli->outbuf,smb_vwv11,capabilities); 
	p = smb_buf(cli->outbuf);
	memcpy(p, pword, passlen);
	p += passlen;
	p += clistr_push(cli, p, user, -1, STR_TERMINATE); /* username */
	p += clistr_push(cli, p, workgroup, -1, STR_TERMINATE); /* workgroup */
	p += clistr_push(cli, p, "Unix", -1, STR_TERMINATE);
	p += clistr_push(cli, p, "Samba", -1, STR_TERMINATE);
	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
	      return False;
	
	show_msg(cli->inbuf);
	
	if (cli_is_error(cli)) {
		return False;
	}

	cli->vuid = SVAL(cli->inbuf,smb_uid);
	p = smb_buf(cli->inbuf);
	p += clistr_pull(cli, cli->server_os, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_type, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_domain, p, sizeof(fstring), -1, STR_TERMINATE);
	fstrcpy(cli->user_name, user);

	return True;
}


/****************************************************************************
do a NT1 NTLM/LM encrypted session setup
****************************************************************************/
static BOOL cli_session_setup_nt1(struct cli_state *cli, char *user, 
				  char *pass, int passlen,
				  char *ntpass, int ntpasslen,
				  char *workgroup)
{
	uint32 capabilities = cli_session_setup_capabilities(cli);
	fstring pword, ntpword;
	char *p;

	if (passlen > sizeof(pword)-1 || ntpasslen > sizeof(ntpword)-1) {
		return False;
	}

	if (passlen != 24) {
		/* non encrypted password supplied. */
		passlen = 24;
		ntpasslen = 24;
		clistr_push(cli, pword, pass, sizeof(pword), STR_TERMINATE);
		clistr_push(cli, ntpword, ntpass, sizeof(ntpword), STR_TERMINATE);
		SMBencrypt((uchar *)pword,cli->secblob.data,(uchar *)pword);
		SMBNTencrypt((uchar *)ntpword,cli->secblob.data,(uchar *)ntpword);
	} else {
		memcpy(pword, pass, passlen);
		memcpy(ntpword, ntpass, ntpasslen);
	}

	/* send a session setup command */
	memset(cli->outbuf,'\0',smb_size);

	set_message(cli->outbuf,13,0,True);
	CVAL(cli->outbuf,smb_com) = SMBsesssetupX;
	cli_setup_packet(cli);
			
	CVAL(cli->outbuf,smb_vwv0) = 0xFF;
	SSVAL(cli->outbuf,smb_vwv2,CLI_BUFFER_SIZE);
	SSVAL(cli->outbuf,smb_vwv3,2);
	SSVAL(cli->outbuf,smb_vwv4,cli->pid);
	SIVAL(cli->outbuf,smb_vwv5,cli->sesskey);
	SSVAL(cli->outbuf,smb_vwv7,passlen);
	SSVAL(cli->outbuf,smb_vwv8,ntpasslen);
	SIVAL(cli->outbuf,smb_vwv11,capabilities); 
	p = smb_buf(cli->outbuf);
	memcpy(p,pword,passlen); p += passlen;
	memcpy(p,ntpword,ntpasslen); p += ntpasslen;
	p += clistr_push(cli, p, user, -1, STR_TERMINATE|STR_UPPER);
	p += clistr_push(cli, p, workgroup, -1, STR_TERMINATE|STR_UPPER);
	p += clistr_push(cli, p, "Unix", -1, STR_TERMINATE);
	p += clistr_push(cli, p, "Samba", -1, STR_TERMINATE);
	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return False;

	show_msg(cli->inbuf);

	if (cli_is_error(cli)) {
		return False;
	}
	
	/* use the returned vuid from now on */
	cli->vuid = SVAL(cli->inbuf,smb_uid);
	
	p = smb_buf(cli->inbuf);
	p += clistr_pull(cli, cli->server_os, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_type, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_domain, p, sizeof(fstring), -1, STR_TERMINATE);

	fstrcpy(cli->user_name, user);

	return True;
}


/****************************************************************************
send a extended security session setup blob, returning a reply blob
****************************************************************************/
static DATA_BLOB cli_session_setup_blob(struct cli_state *cli, DATA_BLOB blob)
{
	uint32 capabilities = cli_session_setup_capabilities(cli);
	char *p;
	DATA_BLOB blob2;

	blob2 = data_blob(NULL, 0);

	capabilities |= CAP_EXTENDED_SECURITY;

	/* send a session setup command */
	memset(cli->outbuf,'\0',smb_size);

	set_message(cli->outbuf,12,0,True);
	CVAL(cli->outbuf,smb_com) = SMBsesssetupX;
	cli_setup_packet(cli);
			
	CVAL(cli->outbuf,smb_vwv0) = 0xFF;
	SSVAL(cli->outbuf,smb_vwv2,CLI_BUFFER_SIZE);
	SSVAL(cli->outbuf,smb_vwv3,2);
	SSVAL(cli->outbuf,smb_vwv4,0);
	SIVAL(cli->outbuf,smb_vwv5,0);
	SSVAL(cli->outbuf,smb_vwv7,blob.length);
	SIVAL(cli->outbuf,smb_vwv10,capabilities); 
	p = smb_buf(cli->outbuf);
	memcpy(p, blob.data, blob.length);
	p += blob.length;
	p += clistr_push(cli, p, "Unix", -1, STR_TERMINATE);
	p += clistr_push(cli, p, "Samba", -1, STR_TERMINATE);
	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return blob2;

	show_msg(cli->inbuf);

	if (cli_is_error(cli) && !NT_STATUS_EQUAL(cli_nt_error(cli),
						  NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		return blob2;
	}
	
	/* use the returned vuid from now on */
	cli->vuid = SVAL(cli->inbuf,smb_uid);
	
	p = smb_buf(cli->inbuf);

	blob2 = data_blob(p, SVAL(cli->inbuf, smb_vwv3));

	p += blob2.length;
	p += clistr_pull(cli, cli->server_os, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_type, p, sizeof(fstring), -1, STR_TERMINATE);
	p += clistr_pull(cli, cli->server_domain, p, sizeof(fstring), -1, STR_TERMINATE);

	return blob2;
}


#if HAVE_KRB5
/****************************************************************************
do a spnego/kerberos encrypted session setup
****************************************************************************/
static BOOL cli_session_setup_kerberos(struct cli_state *cli, char *principal, char *workgroup)
{
	DATA_BLOB blob2, negTokenTarg;

	d_printf("Doing kerberos session setup\n");

	/* generate the encapsulated kerberos5 ticket */
	negTokenTarg = spnego_gen_negTokenTarg(cli, principal);

	if (!negTokenTarg.data) return False;

#if 0
	file_save("negTokenTarg.dat", negTokenTarg.data, negTokenTarg.length);
#endif

	blob2 = cli_session_setup_blob(cli, negTokenTarg);

	/* we don't need this blob for kerberos */
	data_blob_free(&blob2);

	return !cli_is_error(cli);
}
#endif

/****************************************************************************
do a spnego/NTLMSSP encrypted session setup
****************************************************************************/
static BOOL cli_session_setup_ntlmssp(struct cli_state *cli, char *user, 
				      char *pass, char *workgroup)
{
	const char *mechs[] = {OID_NTLMSSP, NULL};
	DATA_BLOB msg1;
	DATA_BLOB blob, chal1, chal2, auth;
	uint8 challenge[8];
	uint8 nthash[24], lmhash[24], sess_key[16];
	uint32 neg_flags;

	neg_flags = NTLMSSP_NEGOTIATE_UNICODE | 
		NTLMSSP_NEGOTIATE_LM_KEY | 
		NTLMSSP_NEGOTIATE_NTLM;

	memset(sess_key, 0, 16);

	/* generate the ntlmssp negotiate packet */
	msrpc_gen(&blob, "CddB",
		  "NTLMSSP",
		  NTLMSSP_NEGOTIATE,
		  neg_flags,
		  sess_key, 16);

	/* and wrap it in a SPNEGO wrapper */
	msg1 = gen_negTokenTarg(mechs, blob);
	data_blob_free(&blob);

	/* now send that blob on its way */
	blob = cli_session_setup_blob(cli, msg1);

	data_blob_free(&msg1);

	if (!NT_STATUS_EQUAL(cli_nt_error(cli), NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		return False;
	}

#if 0
	file_save("chal.dat", blob.data, blob.length);
#endif

	/* the server gives us back two challenges */
	if (!spnego_parse_challenge(blob, &chal1, &chal2)) {
		DEBUG(3,("Failed to parse challenges\n"));
		return False;
	}

	data_blob_free(&blob);

	/* encrypt the password with the challenge */
	memcpy(challenge, chal1.data + 24, 8);
	SMBencrypt((unsigned char *)pass, challenge,lmhash);
	SMBNTencrypt((unsigned char *)pass, challenge,nthash);

#if 0
	file_save("nthash.dat", nthash, 24);
	file_save("lmhash.dat", lmhash, 24);
	file_save("chal1.dat", chal1.data, chal1.length);
#endif

	data_blob_free(&chal1);
	data_blob_free(&chal2);

	/* this generates the actual auth packet */
	msrpc_gen(&blob, "CdBBUUUBd", 
		  "NTLMSSP", 
		  NTLMSSP_AUTH, 
		  lmhash, 24,
		  nthash, 24,
		  workgroup, 
		  user, 
		  cli->calling.name,
		  sess_key, 16,
		  neg_flags);

	/* wrap it in SPNEGO */
	auth = spnego_gen_auth(blob);

	data_blob_free(&blob);

	/* now send the auth packet and we should be done */
	blob = cli_session_setup_blob(cli, auth);

	data_blob_free(&auth);
	data_blob_free(&blob);

	return !cli_is_error(cli);
}


/****************************************************************************
do a spnego encrypted session setup
****************************************************************************/
static BOOL cli_session_setup_spnego(struct cli_state *cli, char *user, 
				     char *pass, char *workgroup)
{
	char *principal;
	char *OIDs[ASN1_MAX_OIDS];
	uint8 guid[16];
	int i;
	BOOL got_kerberos_mechanism = False;

	d_printf("Doing spnego session setup\n");

	/* the server might not even do spnego */
	if (cli->secblob.length == 16) {
		DEBUG(3,("server didn't supply a full spnego negprot\n"));
		goto ntlmssp;
	}

#if 0
	file_save("negprot.dat", cli->secblob.data, cli->secblob.length);
#endif

	/* the server sent us the first part of the SPNEGO exchange in the negprot 
	   reply */
	if (!spnego_parse_negTokenInit(cli->secblob, guid, OIDs, &principal)) {
		return False;
	}

	/* make sure the server understands kerberos */
	for (i=0;OIDs[i];i++) {
		DEBUG(3,("got OID=%s\n", OIDs[i]));
		if (strcmp(OIDs[i], OID_KERBEROS5_OLD) == 0 ||
		    strcmp(OIDs[i], OID_KERBEROS5) == 0) {
			got_kerberos_mechanism = True;
		}
		free(OIDs[i]);
	}
	DEBUG(3,("got principal=%s\n", principal));

	fstrcpy(cli->user_name, user);

#if HAVE_KRB5
	if (got_kerberos_mechanism && cli->use_kerberos) {
		return cli_session_setup_kerberos(cli, principal, workgroup);
	}
#endif

	free(principal);

ntlmssp:

	return cli_session_setup_ntlmssp(cli, user, pass, workgroup);
}


/****************************************************************************
 Send a session setup. The username and workgroup is in UNIX character
 format and must be converted to DOS codepage format before sending. If the
 password is in plaintext, the same should be done.
****************************************************************************/
BOOL cli_session_setup(struct cli_state *cli, 
		       char *user, 
		       char *pass, int passlen,
		       char *ntpass, int ntpasslen,
		       char *workgroup)
{
	char *p;
	fstring user2;

	/* allow for workgroups as part of the username */
	fstrcpy(user2, user);
	if ((p=strchr_m(user2,'\\')) || (p=strchr_m(user2,'/'))) {
		*p = 0;
		user = p+1;
		workgroup = user2;
	}

	if (cli->protocol < PROTOCOL_LANMAN1)
		return True;

	/* now work out what sort of session setup we are going to
           do. I have split this into separate functions to make the
           flow a bit easier to understand (tridge) */

	/* if its an older server then we have to use the older request format */
	if (cli->protocol < PROTOCOL_NT1) {
		return cli_session_setup_lanman2(cli, user, pass, passlen);
	}

	/* if no user is supplied then we have to do an anonymous connection.
	   passwords are ignored */
	if (!user || !*user) {
		return cli_session_setup_guest(cli);
	}

	/* if the server is share level then send a plaintext null
           password at this point. The password is sent in the tree
           connect */
	if ((cli->sec_mode & 1) == 0) {
		return cli_session_setup_plaintext(cli, user, "", workgroup);
	}

	/* if the server doesn't support encryption then we have to use plaintext. The 
	   second password is ignored */
	if ((cli->sec_mode & 2) == 0) {
		return cli_session_setup_plaintext(cli, user, pass, workgroup);
	}

	/* if the server supports extended security then use SPNEGO */
	if (cli->capabilities & CAP_EXTENDED_SECURITY) {
		return cli_session_setup_spnego(cli, user, pass, workgroup);
	}

	/* otherwise do a NT1 style session setup */
	return cli_session_setup_nt1(cli, user, 
				     pass, passlen, ntpass, ntpasslen,
				     workgroup);	
}

/****************************************************************************
 Send a uloggoff.
*****************************************************************************/

BOOL cli_ulogoff(struct cli_state *cli)
{
        memset(cli->outbuf,'\0',smb_size);
        set_message(cli->outbuf,2,0,True);
        CVAL(cli->outbuf,smb_com) = SMBulogoffX;
        cli_setup_packet(cli);
	SSVAL(cli->outbuf,smb_vwv0,0xFF);
	SSVAL(cli->outbuf,smb_vwv2,0);  /* no additional info */

        cli_send_smb(cli);
        if (!cli_receive_smb(cli))
                return False;

        return !cli_is_error(cli);
}

/****************************************************************************
send a tconX
****************************************************************************/
BOOL cli_send_tconX(struct cli_state *cli, 
		    const char *share, const char *dev, const char *pass, int passlen)
{
	fstring fullshare, pword, dos_pword;
	char *p;
	memset(cli->outbuf,'\0',smb_size);
	memset(cli->inbuf,'\0',smb_size);

	fstrcpy(cli->share, share);

	/* in user level security don't send a password now */
	if (cli->sec_mode & 1) {
		passlen = 1;
		pass = "";
	}

	if ((cli->sec_mode & 2) && *pass && passlen != 24) {
		/*
		 * Non-encrypted passwords - convert to DOS codepage before encryption.
		 */
		passlen = 24;
		clistr_push(cli, dos_pword, pass, -1, STR_TERMINATE);
		SMBencrypt((uchar *)dos_pword,cli->secblob.data,(uchar *)pword);
	} else {
		if((cli->sec_mode & 3) == 0) {
			/*
			 * Non-encrypted passwords - convert to DOS codepage before using.
			 */
			passlen = clistr_push(cli, pword, pass, -1, STR_TERMINATE);
		} else {
			memcpy(pword, pass, passlen);
		}
	}

	if (cli->port == 445) {
		slprintf(fullshare, sizeof(fullshare)-1,
			 "%s", share);
	} else {
		slprintf(fullshare, sizeof(fullshare)-1,
			 "\\\\%s\\%s", cli->desthost, share);
	}

	set_message(cli->outbuf,4, 0, True);
	CVAL(cli->outbuf,smb_com) = SMBtconX;
	cli_setup_packet(cli);

	SSVAL(cli->outbuf,smb_vwv0,0xFF);
	SSVAL(cli->outbuf,smb_vwv3,passlen);

	p = smb_buf(cli->outbuf);
	memcpy(p,pword,passlen);
	p += passlen;
	p += clistr_push(cli, p, fullshare, -1, STR_TERMINATE |STR_UPPER);
	fstrcpy(p, dev); p += strlen(dev)+1;

	cli_setup_bcc(cli, p);

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return False;

	if (cli_is_error(cli)) {
		return False;
	}

	fstrcpy(cli->dev, "A:");

	if (cli->protocol >= PROTOCOL_NT1) {
		clistr_pull(cli, cli->dev, smb_buf(cli->inbuf), sizeof(fstring), -1, STR_TERMINATE);
	}

	if (strcasecmp(share,"IPC$")==0) {
		fstrcpy(cli->dev, "IPC");
	}

	/* only grab the device if we have a recent protocol level */
	if (cli->protocol >= PROTOCOL_NT1 &&
	    smb_buflen(cli->inbuf) == 3) {
		/* almost certainly win95 - enable bug fixes */
		cli->win95 = True;
	}

	cli->cnum = SVAL(cli->inbuf,smb_tid);
	return True;
}


/****************************************************************************
send a tree disconnect
****************************************************************************/
BOOL cli_tdis(struct cli_state *cli)
{
	memset(cli->outbuf,'\0',smb_size);
	set_message(cli->outbuf,0,0,True);
	CVAL(cli->outbuf,smb_com) = SMBtdis;
	SSVAL(cli->outbuf,smb_tid,cli->cnum);
	cli_setup_packet(cli);
	
	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return False;
	
	return !cli_is_error(cli);
}


/****************************************************************************
send a negprot command
****************************************************************************/
void cli_negprot_send(struct cli_state *cli)
{
	char *p;
	int numprots;

	memset(cli->outbuf,'\0',smb_size);

	/* setup the protocol strings */
	set_message(cli->outbuf,0,0,True);

	p = smb_buf(cli->outbuf);
	for (numprots=0;
	     prots[numprots].name && prots[numprots].prot<=cli->protocol;
	     numprots++) {
		*p++ = 2;
		p += clistr_push(cli, p, prots[numprots].name, -1, STR_TERMINATE);
	}

	CVAL(cli->outbuf,smb_com) = SMBnegprot;
	cli_setup_bcc(cli, p);
	cli_setup_packet(cli);

	CVAL(smb_buf(cli->outbuf),0) = 2;

	cli_send_smb(cli);
}


/****************************************************************************
send a negprot command
****************************************************************************/
BOOL cli_negprot(struct cli_state *cli)
{
	char *p;
	int numprots;
	int plength;

	memset(cli->outbuf,'\0',smb_size);

	/* setup the protocol strings */
	for (plength=0,numprots=0;
	     prots[numprots].name && prots[numprots].prot<=cli->protocol;
	     numprots++)
		plength += strlen(prots[numprots].name)+2;
    
	set_message(cli->outbuf,0,plength,True);

	p = smb_buf(cli->outbuf);
	for (numprots=0;
	     prots[numprots].name && prots[numprots].prot<=cli->protocol;
	     numprots++) {
		*p++ = 2;
		p += clistr_push(cli, p, prots[numprots].name, -1, STR_TERMINATE);
	}

	CVAL(cli->outbuf,smb_com) = SMBnegprot;
	cli_setup_packet(cli);

	CVAL(smb_buf(cli->outbuf),0) = 2;

	cli_send_smb(cli);
	if (!cli_receive_smb(cli))
		return False;

	show_msg(cli->inbuf);

	if (cli_is_error(cli) ||
	    ((int)SVAL(cli->inbuf,smb_vwv0) >= numprots)) {
		return(False);
	}

	cli->protocol = prots[SVAL(cli->inbuf,smb_vwv0)].prot;

	if (cli->protocol >= PROTOCOL_NT1) {    
		/* NT protocol */
		cli->sec_mode = CVAL(cli->inbuf,smb_vwv1);
		cli->max_mux = SVAL(cli->inbuf, smb_vwv1+1);
		cli->max_xmit = IVAL(cli->inbuf,smb_vwv3+1);
		cli->sesskey = IVAL(cli->inbuf,smb_vwv7+1);
		cli->serverzone = SVALS(cli->inbuf,smb_vwv15+1);
		cli->serverzone *= 60;
		/* this time arrives in real GMT */
		cli->servertime = interpret_long_date(cli->inbuf+smb_vwv11+1);
		cli->secblob = data_blob(smb_buf(cli->inbuf),smb_buflen(cli->inbuf));
		cli->capabilities = IVAL(cli->inbuf,smb_vwv9+1);
		if (cli->capabilities & CAP_RAW_MODE) {
			cli->readbraw_supported = True;
			cli->writebraw_supported = True;      
		}
		/* work out if they sent us a workgroup */
		if (smb_buflen(cli->inbuf) > 8) {
			clistr_pull(cli, cli->server_domain, 
				    smb_buf(cli->inbuf)+8, sizeof(cli->server_domain),
				    smb_buflen(cli->inbuf)-8, STR_UNICODE|STR_NOALIGN);
		}
	} else if (cli->protocol >= PROTOCOL_LANMAN1) {
		cli->sec_mode = SVAL(cli->inbuf,smb_vwv1);
		cli->max_xmit = SVAL(cli->inbuf,smb_vwv2);
		cli->sesskey = IVAL(cli->inbuf,smb_vwv6);
		cli->serverzone = SVALS(cli->inbuf,smb_vwv10);
		cli->serverzone *= 60;
		/* this time is converted to GMT by make_unix_date */
		cli->servertime = make_unix_date(cli->inbuf+smb_vwv8);
		cli->readbraw_supported = ((SVAL(cli->inbuf,smb_vwv5) & 0x1) != 0);
		cli->writebraw_supported = ((SVAL(cli->inbuf,smb_vwv5) & 0x2) != 0);
		cli->secblob = data_blob(smb_buf(cli->inbuf),smb_buflen(cli->inbuf));
	} else {
		/* the old core protocol */
		cli->sec_mode = 0;
		cli->serverzone = TimeDiff(time(NULL));
	}

	cli->max_xmit = MIN(cli->max_xmit, CLI_BUFFER_SIZE);

	/* a way to force ascii SMB */
	if (getenv("CLI_FORCE_ASCII")) {
		cli->capabilities &= ~CAP_UNICODE;
	}

	return True;
}


/****************************************************************************
  send a session request.  see rfc1002.txt 4.3 and 4.3.2
****************************************************************************/
BOOL cli_session_request(struct cli_state *cli,
			 struct nmb_name *calling, struct nmb_name *called)
{
	char *p;
	int len = 4;
	extern pstring user_socket_options;

	/* 445 doesn't have session request */
	if (cli->port == 445) return True;

	/* send a session request (RFC 1002) */
	memcpy(&(cli->calling), calling, sizeof(*calling));
	memcpy(&(cli->called ), called , sizeof(*called ));
  
	/* put in the destination name */
	p = cli->outbuf+len;
	name_mangle(cli->called .name, p, cli->called .name_type);
	len += name_len(p);

	/* and my name */
	p = cli->outbuf+len;
	name_mangle(cli->calling.name, p, cli->calling.name_type);
	len += name_len(p);

	/* setup the packet length */
	_smb_setlen(cli->outbuf,len);
	CVAL(cli->outbuf,0) = 0x81;

#ifdef WITH_SSL
retry:
#endif /* WITH_SSL */

	cli_send_smb(cli);
	DEBUG(5,("Sent session request\n"));

	if (!cli_receive_smb(cli))
		return False;

	if (CVAL(cli->inbuf,0) == 0x84) {
		/* C. Hoch  9/14/95 Start */
		/* For information, here is the response structure.
		 * We do the byte-twiddling to for portability.
		struct RetargetResponse{
		unsigned char type;
		unsigned char flags;
		int16 length;
		int32 ip_addr;
		int16 port;
		};
		*/
		int port = (CVAL(cli->inbuf,8)<<8)+CVAL(cli->inbuf,9);
		/* SESSION RETARGET */
		putip((char *)&cli->dest_ip,cli->inbuf+4);

		cli->fd = open_socket_out(SOCK_STREAM, &cli->dest_ip, port, LONG_CONNECT_TIMEOUT);
		if (cli->fd == -1)
			return False;

		DEBUG(3,("Retargeted\n"));

		set_socket_options(cli->fd,user_socket_options);

		/* Try again */
		{
			static int depth;
			BOOL ret;
			if (depth > 4) {
				DEBUG(0,("Retarget recursion - failing\n"));
				return False;
			}
			depth++;
			ret = cli_session_request(cli, calling, called);
			depth--;
			return ret;
		}
	} /* C. Hoch 9/14/95 End */

#ifdef WITH_SSL
    if (CVAL(cli->inbuf,0) == 0x83 && CVAL(cli->inbuf,4) == 0x8e){ /* use ssl */
        if (!sslutil_fd_is_ssl(cli->fd)){
            if (sslutil_connect(cli->fd) == 0)
                goto retry;
        }
    }
#endif /* WITH_SSL */

	if (CVAL(cli->inbuf,0) != 0x82) {
                /* This is the wrong place to put the error... JRA. */
		cli->rap_error = CVAL(cli->inbuf,4);
		return False;
	}
	return(True);
}

/****************************************************************************
open the client sockets
****************************************************************************/
BOOL cli_connect(struct cli_state *cli, const char *host, struct in_addr *ip)
{
	extern struct in_addr ipzero;
	extern pstring user_socket_options;

	fstrcpy(cli->desthost, host);
	
	if (!ip || ip_equal(*ip, ipzero)) {
                if (!resolve_name( cli->desthost, &cli->dest_ip, 0x20)) {
                        return False;
                }
		if (ip) *ip = cli->dest_ip;
	} else {
		cli->dest_ip = *ip;
	}

	if (getenv("LIBSMB_PROG")) {
		cli->fd = sock_exec(getenv("LIBSMB_PROG"));
	} else {
		/* try 445 first, then 139 */
		int port = cli->port?cli->port:445;
		cli->fd = open_socket_out(SOCK_STREAM, &cli->dest_ip, 
					  port, cli->timeout);
		if (cli->fd == -1 && cli->port == 0) {
			port = 139;
			cli->fd = open_socket_out(SOCK_STREAM, &cli->dest_ip, 
						  port, cli->timeout);
		}
		if (cli->fd != -1) cli->port = port;
	}
	if (cli->fd == -1) {
		DEBUG(1,("Error connecting to %s (%s)\n",
			 inet_ntoa(*ip),strerror(errno)));
		return False;
	}

	set_socket_options(cli->fd,user_socket_options);

	return True;
}

/****************************************************************************
re-establishes a connection
****************************************************************************/
BOOL cli_reestablish_connection(struct cli_state *cli)
{
	struct nmb_name calling;
	struct nmb_name called;
	fstring dest_host;
	fstring share;
	fstring dev;
	BOOL do_tcon = False;
	int oldfd = cli->fd;

	if (!cli->initialised || cli->fd == -1)
	{
		DEBUG(3,("cli_reestablish_connection: not connected\n"));
		return False;
	}

	/* copy the parameters necessary to re-establish the connection */

	if (cli->cnum != 0)
	{
		fstrcpy(share, cli->share);
		fstrcpy(dev  , cli->dev);
		do_tcon = True;
	}

	memcpy(&called , &(cli->called ), sizeof(called ));
	memcpy(&calling, &(cli->calling), sizeof(calling));
	fstrcpy(dest_host, cli->full_dest_host_name);

	DEBUG(5,("cli_reestablish_connection: %s connecting to %s (ip %s) - %s [%s]\n",
		 nmb_namestr(&calling), nmb_namestr(&called), 
		 inet_ntoa(cli->dest_ip),
		 cli->user_name, cli->domain));

	cli->fd = -1;

	if (cli_establish_connection(cli,
				     dest_host, &cli->dest_ip,
				     &calling, &called,
				     share, dev, False, do_tcon)) {
		if ((cli->fd != oldfd) && (oldfd != -1)) {
			close( oldfd );
		}
		return True;
	}
	return False;
}

/****************************************************************************
establishes a connection right up to doing tconX, reading in a password.
****************************************************************************/
BOOL cli_establish_connection(struct cli_state *cli, 
				char *dest_host, struct in_addr *dest_ip,
				struct nmb_name *calling, struct nmb_name *called,
				char *service, char *service_type,
				BOOL do_shutdown, BOOL do_tcon)
{
	DEBUG(5,("cli_establish_connection: %s connecting to %s (%s) - %s [%s]\n",
		          nmb_namestr(calling), nmb_namestr(called), inet_ntoa(*dest_ip),
	              cli->user_name, cli->domain));

	/* establish connection */

	if ((!cli->initialised))
	{
		return False;
	}

	/* cli_establish_connection() can't handle spnego yet. Once we get rid of
	   pwd_cache and other horrors we can get rid of this */
	cli->use_spnego = False;

	if (cli->fd == -1)
	{
		if (!cli_connect(cli, dest_host, dest_ip))
		{
			DEBUG(1,("cli_establish_connection: failed to connect to %s (%s)\n",
					  nmb_namestr(called), inet_ntoa(*dest_ip)));
			return False;
		}
	}

	if (!cli_session_request(cli, calling, called))
	{
		DEBUG(1,("failed session request\n"));
		if (do_shutdown)
			cli_shutdown(cli);
		return False;
	}

	if (!cli_negprot(cli))
	{
		DEBUG(1,("failed negprot\n"));
		if (do_shutdown)
          		cli_shutdown(cli);
		return False;
	}

	if (cli->pwd.cleartext || cli->pwd.null_pwd)
	{
		fstring passwd;
		int pass_len;

		if (cli->pwd.null_pwd)
		{
			/* attempt null session */
			passwd[0] = 0;
			pass_len = 1;
		}
		else
		{
			/* attempt clear-text session */
			pwd_get_cleartext(&(cli->pwd), passwd);
			pass_len = strlen(passwd);
		}

		/* attempt clear-text session */
		if (!cli_session_setup(cli, cli->user_name,
	                       passwd, pass_len,
	                       NULL, 0,
	                       cli->domain))
		{
			DEBUG(1,("failed session setup\n"));
			if (do_shutdown)
			{
				cli_shutdown(cli);
			}
			return False;
		}
		if (do_tcon)
		{
			if (!cli_send_tconX(cli, service, service_type,
			                    (char*)passwd, strlen(passwd)))
			{
				DEBUG(1,("failed tcon_X\n"));
				if (do_shutdown)
				{
					cli_shutdown(cli);
				}
				return False;
			}
		}
	}
	else
	{
		/* attempt encrypted session */
		unsigned char nt_sess_pwd[24];
		unsigned char lm_sess_pwd[24];

		/* creates (storing a copy of) and then obtains a 24 byte password OWF */
		pwd_make_lm_nt_owf(&(cli->pwd), cli->secblob.data);
		pwd_get_lm_nt_owf(&(cli->pwd), lm_sess_pwd, nt_sess_pwd);

		/* attempt encrypted session */
		if (!cli_session_setup(cli, cli->user_name,
	                       (char*)lm_sess_pwd, sizeof(lm_sess_pwd),
	                       (char*)nt_sess_pwd, sizeof(nt_sess_pwd),
	                       cli->domain))
		{
			DEBUG(1,("failed session setup\n"));
			if (do_shutdown)
		              cli_shutdown(cli);
			return False;
		}

    		DEBUG(1,("session setup ok\n"));
    
    		if (*cli->server_domain || *cli->server_os || *cli->server_type)
    		{
    			DEBUG(1,("Domain=[%s] OS=[%s] Server=[%s]\n",
				 cli->server_domain,
				 cli->server_os,
				 cli->server_type));
    		}
		
		if (do_tcon)
		{
			if (!cli_send_tconX(cli, service, service_type,
			                    (char*)nt_sess_pwd, sizeof(nt_sess_pwd)))
			{
				DEBUG(1,("failed tcon_X\n"));
				if (do_shutdown)
                  cli_shutdown(cli);
				return False;
			}
		}
	}

	if (do_shutdown)
		cli_shutdown(cli);

	return True;
}


/****************************************************************************
 Attempt a NetBIOS session request, falling back to *SMBSERVER if needed.
****************************************************************************/

BOOL attempt_netbios_session_request(struct cli_state *cli, char *srchost, char *desthost,
                                     struct in_addr *pdest_ip)
{
  struct nmb_name calling, called;

  make_nmb_name(&calling, srchost, 0x0);

  /*
   * If the called name is an IP address
   * then use *SMBSERVER immediately.
   */

  if(is_ipaddress(desthost))
    make_nmb_name(&called, "*SMBSERVER", 0x20);
  else
    make_nmb_name(&called, desthost, 0x20);

  if (!cli_session_request(cli, &calling, &called)) {
    struct nmb_name smbservername;

    make_nmb_name(&smbservername , "*SMBSERVER", 0x20);

    /*
     * If the name wasn't *SMBSERVER then
     * try with *SMBSERVER if the first name fails.
     */

    if (nmb_name_equal(&called, &smbservername)) {

        /*
         * The name used was *SMBSERVER, don't bother with another name.
         */

        DEBUG(0,("attempt_netbios_session_request: %s rejected the session for name *SMBSERVER \
with error %s.\n", desthost, cli_errstr(cli) ));
	    cli_shutdown(cli);
		return False;
	}

    cli_shutdown(cli);

    if (!cli_initialise(cli) ||
        !cli_connect(cli, desthost, pdest_ip) ||
        !cli_session_request(cli, &calling, &smbservername)) {
          DEBUG(0,("attempt_netbios_session_request: %s rejected the session for \
name *SMBSERVER with error %s\n", desthost, cli_errstr(cli) ));
          cli_shutdown(cli);
          return False;
    }
  }

  return True;
}