samba-mirror/source3/smbd/sesssetup.c

/* 
   Unix SMB/CIFS implementation.
   handle SMBsessionsetup
   Copyright (C) Andrew Tridgell 1998-2001
   Copyright (C) Andrew Bartlett      2001
   Copyright (C) Jim McDonough        2002

   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.
*/

#include "includes.h"

uint32 global_client_caps = 0;
static struct auth_context *ntlmssp_auth_context = NULL;

/*
  on a logon error possibly map the error to success if "map to guest"
  is set approriately
*/
static NTSTATUS do_map_to_guest(NTSTATUS status, auth_serversupplied_info **server_info,
				const char *user, const char *domain)
{
	if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
		if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) || 
		    (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
			DEBUG(3,("No such user %s [%s] - using guest account\n",
				 user, domain));
			make_server_info_guest(server_info);
			status = NT_STATUS_OK;
		}
	}

	if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
		if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
			DEBUG(3,("Registered username %s for guest access\n",user));
			make_server_info_guest(server_info);
			status = NT_STATUS_OK;
		}
	}

	return status;
}


/****************************************************************************
 Add the standard 'Samba' signature to the end of the session setup.
****************************************************************************/
static void add_signature(char *outbuf) 
{
	char *p;
	p = smb_buf(outbuf);
	p += srvstr_push(outbuf, p, "Unix", -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, "Samba", -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, lp_workgroup(), -1, STR_TERMINATE);
	set_message_end(outbuf,p);
}

/****************************************************************************
 Do a 'guest' logon, getting back the 
****************************************************************************/
static NTSTATUS check_guest_password(auth_serversupplied_info **server_info) 
{
	struct auth_context *auth_context;
	auth_usersupplied_info *user_info = NULL;
	
	NTSTATUS nt_status;
	unsigned char chal[8];

	ZERO_STRUCT(chal);

	DEBUG(3,("Got anonymous request\n"));

	if (!NT_STATUS_IS_OK(nt_status = make_auth_context_fixed(&auth_context, chal))) {
		return nt_status;
	}

	if (!make_user_info_guest(&user_info)) {
		(auth_context->free)(&auth_context);
		return NT_STATUS_NO_MEMORY;
	}
	
	nt_status = auth_context->check_ntlm_password(auth_context, user_info, server_info);
	(auth_context->free)(&auth_context);
	free_user_info(&user_info);
	return nt_status;
}


#ifdef HAVE_KRB5
/****************************************************************************
reply to a session setup spnego negotiate packet for kerberos
****************************************************************************/
static int reply_spnego_kerberos(connection_struct *conn, 
				 char *inbuf, char *outbuf,
				 int length, int bufsize,
				 DATA_BLOB *secblob)
{
	DATA_BLOB ticket;
	char *client, *p;
	const struct passwd *pw;
	char *user;
	int sess_vuid;
	NTSTATUS ret;
	DATA_BLOB auth_data;
	auth_serversupplied_info *server_info = NULL;
	ADS_STRUCT *ads;

	if (!spnego_parse_krb5_wrap(*secblob, &ticket)) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	ads = ads_init_simple();

	if (!ads) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	ads->auth.realm = strdup(lp_realm());

	ret = ads_verify_ticket(ads, &ticket, &client, &auth_data);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(1,("Failed to verify incoming ticket!\n"));	
		ads_destroy(&ads);
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	DEBUG(3,("Ticket name is [%s]\n", client));

	p = strchr_m(client, '@');
	if (!p) {
		DEBUG(3,("Doesn't look like a valid principal\n"));
		ads_destroy(&ads);
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	*p = 0;
	if (strcasecmp(p+1, ads->auth.realm) != 0) {
		DEBUG(3,("Ticket for foreign realm %s@%s\n", client, p+1));
		if (!lp_allow_trusted_domains()) {
			return ERROR_NT(NT_STATUS_LOGON_FAILURE);
		}
		/* this gives a fully qualified user name (ie. with full realm).
		   that leads to very long usernames, but what else can we do? */
		asprintf(&user, "%s%s%s", p+1, lp_winbind_separator(), client);
	} else {
		user = strdup(client);
	}
	ads_destroy(&ads);

	/* setup the string used by %U */
	sub_set_smb_name(user);

	reload_services(True);

	/* the password is good - let them in */
	pw = Get_Pwnam(user);
	if (!pw && !strstr(user, lp_winbind_separator())) {
		char *user2;
		/* try it with a winbind domain prefix */
		asprintf(&user2, "%s%s%s", lp_workgroup(), lp_winbind_separator(), user);
		pw = Get_Pwnam(user2);
		if (pw) {
			free(user);
			user = user2;
		}
	}

	if (!pw) {
		DEBUG(1,("Username %s is invalid on this system\n",user));
		return ERROR_NT(NT_STATUS_NO_SUCH_USER);
	}

	if (!NT_STATUS_IS_OK(ret = make_server_info_pw(&server_info,pw))) {
		DEBUG(1,("make_server_info_from_pw failed!\n"));
		return ERROR_NT(ret);
	}
	
	sess_vuid = register_vuid(server_info, user);

	free(user);
	free_server_info(&server_info);

	if (sess_vuid == -1) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	set_message(outbuf,4,0,True);
	SSVAL(outbuf, smb_vwv3, 0);
	add_signature(outbuf);
 
	SSVAL(outbuf,smb_uid,sess_vuid);
	SSVAL(inbuf,smb_uid,sess_vuid);
	
	return chain_reply(inbuf,outbuf,length,bufsize);
}
#endif


/****************************************************************************
send a security blob via a session setup reply
****************************************************************************/
static BOOL reply_sesssetup_blob(connection_struct *conn, char *outbuf,
				 DATA_BLOB blob, uint32 errcode)
{
	char *p;

	set_message(outbuf,4,0,True);

	/* we set NT_STATUS_MORE_PROCESSING_REQUIRED to tell the other end
	   that we aren't finished yet */

	SIVAL(outbuf, smb_rcls, errcode);
	SSVAL(outbuf, smb_vwv0, 0xFF); /* no chaining possible */
	SSVAL(outbuf, smb_vwv3, blob.length);
	p = smb_buf(outbuf);
	memcpy(p, blob.data, blob.length);
	p += blob.length;
	p += srvstr_push(outbuf, p, "Unix", -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, "Samba", -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, lp_workgroup(), -1, STR_TERMINATE);
	set_message_end(outbuf,p);
	
	return send_smb(smbd_server_fd(),outbuf);
}

/****************************************************************************
reply to a session setup spnego negotiate packet
****************************************************************************/
static int reply_spnego_negotiate(connection_struct *conn, 
				  char *inbuf,
				  char *outbuf,
				  int length, int bufsize,
				  DATA_BLOB blob1)
{
	char *OIDs[ASN1_MAX_OIDS];
	DATA_BLOB secblob;
	int i;
	uint32 ntlmssp_command, neg_flags, chal_flags;
	DATA_BLOB chal, spnego_chal;
	const uint8 *cryptkey;
	BOOL got_kerberos = False;
	NTSTATUS nt_status;
	char *cliname=NULL, *domname=NULL;

	/* parse out the OIDs and the first sec blob */
	if (!parse_negTokenTarg(blob1, OIDs, &secblob)) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}
	
	for (i=0;OIDs[i];i++) {
		DEBUG(3,("Got OID %s\n", OIDs[i]));
		if (strcmp(OID_KERBEROS5, OIDs[i]) == 0 ||
		    strcmp(OID_KERBEROS5_OLD, OIDs[i]) == 0) {
			got_kerberos = True;
		}
		free(OIDs[i]);
	}
	DEBUG(3,("Got secblob of size %d\n", secblob.length));

#ifdef HAVE_KRB5
	if (got_kerberos && (SEC_ADS == lp_security())) {
		int ret = reply_spnego_kerberos(conn, inbuf, outbuf, 
						length, bufsize, &secblob);
		data_blob_free(&secblob);
		return ret;
	}
#endif

	/* parse the NTLMSSP packet */
#if 0
	file_save("secblob.dat", secblob.data, secblob.length);
#endif

	if (!msrpc_parse(&secblob, "CddAA",
			 "NTLMSSP",
			 &ntlmssp_command,
			 &neg_flags,
			 &cliname,
			 &domname)) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}
       
	data_blob_free(&secblob);

	if (ntlmssp_command != NTLMSSP_NEGOTIATE) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	debug_ntlmssp_flags(neg_flags);

	if (ntlmssp_auth_context) {
		(ntlmssp_auth_context->free)(&ntlmssp_auth_context);
	}

	if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&ntlmssp_auth_context))) {
		return ERROR_NT(nt_status);
	}

	cryptkey = ntlmssp_auth_context->get_ntlm_challenge(ntlmssp_auth_context);

	/* Give them the challenge. For now, ignore neg_flags and just
	   return the flags we want. Obviously this is not correct */
	
	chal_flags = NTLMSSP_NEGOTIATE_UNICODE | 
		NTLMSSP_NEGOTIATE_128 | 
		NTLMSSP_NEGOTIATE_NTLM |
		NTLMSSP_CHAL_TARGET_INFO;
	
	{
		DATA_BLOB domain_blob, struct_blob;
		fstring dnsname, dnsdomname;
		
		msrpc_gen(&domain_blob, 
			  "U",
			  lp_workgroup());

		fstrcpy(dnsdomname, (SEC_ADS == lp_security())?lp_realm():"");
		strlower(dnsdomname);

		fstrcpy(dnsname, global_myname());
		fstrcat(dnsname, ".");
		fstrcat(dnsname, dnsdomname);
		strlower(dnsname);

		msrpc_gen(&struct_blob, "aaaaa",
			  2, lp_workgroup(),
			  1, global_myname(),
			  4, dnsdomname,
			  3, dnsname,
			  0, "");

		msrpc_gen(&chal, "CdUdbddB",
			  "NTLMSSP", 
			  NTLMSSP_CHALLENGE,
			  lp_workgroup(),
			  chal_flags,
			  cryptkey, 8,
			  0, 0,
			  struct_blob.data, struct_blob.length);

		data_blob_free(&domain_blob);
		data_blob_free(&struct_blob);
	}

	if (!spnego_gen_challenge(&spnego_chal, &chal, &chal)) {
		DEBUG(3,("Failed to generate challenge\n"));
		data_blob_free(&chal);
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	/* now tell the client to send the auth packet */
	reply_sesssetup_blob(conn, outbuf, spnego_chal, NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED));

	data_blob_free(&chal);
	data_blob_free(&spnego_chal);

	/* and tell smbd that we have already replied to this packet */
	return -1;
}

	
/****************************************************************************
reply to a session setup spnego auth packet
****************************************************************************/
static int reply_spnego_auth(connection_struct *conn, char *inbuf, char *outbuf,
			     int length, int bufsize,
			     DATA_BLOB blob1)
{
	DATA_BLOB auth, response;
	char *workgroup = NULL, *user = NULL, *machine = NULL;
	DATA_BLOB lmhash, nthash, sess_key;
	DATA_BLOB plaintext_password = data_blob(NULL, 0);
	uint32 ntlmssp_command, neg_flags;
	NTSTATUS nt_status;
	int sess_vuid;
	BOOL as_guest;
	uint32 auth_flags = AUTH_FLAG_NONE;
	auth_usersupplied_info *user_info = NULL;
	auth_serversupplied_info *server_info = NULL;

	/* we must have setup the auth context by now */
	if (!ntlmssp_auth_context) {
		DEBUG(2,("ntlmssp_auth_context is NULL in reply_spnego_auth\n"));
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	if (!spnego_parse_auth(blob1, &auth)) {
#if 0
		file_save("auth.dat", blob1.data, blob1.length);
#endif
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	/* now the NTLMSSP encoded auth hashes */
	if (!msrpc_parse(&auth, "CdBBUUUBd", 
			 "NTLMSSP", 
			 &ntlmssp_command, 
			 &lmhash,
			 &nthash,
			 &workgroup, 
			 &user, 
			 &machine,
			 &sess_key,
			 &neg_flags)) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	data_blob_free(&auth);
	data_blob_free(&sess_key);
	
	DEBUG(3,("Got user=[%s] workgroup=[%s] machine=[%s] len1=%d len2=%d\n",
		 user, workgroup, machine, lmhash.length, nthash.length));

	/* the client has given us its machine name (which we otherwise would not get on port 445).
	   we need to possibly reload smb.conf if smb.conf includes depend on the machine name */

	set_remote_machine_name(machine);

	/* setup the string used by %U */
	sub_set_smb_name(user);

	reload_services(True);

#if 0
	file_save("nthash1.dat", nthash.data, nthash.length);
	file_save("lmhash1.dat", lmhash.data, lmhash.length);
#endif

	if (lmhash.length) {
		auth_flags |= AUTH_FLAG_LM_RESP;
	}

	if (nthash.length == 24) {
		auth_flags |= AUTH_FLAG_NTLM_RESP;
	} else if (nthash.length > 24) {
		auth_flags |= AUTH_FLAG_NTLMv2_RESP;
	};

	nt_status = make_user_info_map(&user_info, user, workgroup, machine, 
	                               lmhash, nthash, plaintext_password, 
	                               auth_flags, True);

	/* it looks a bit weird, but this function returns int type... */
	if (!NT_STATUS_IS_OK(nt_status)) {
		return ERROR_NT(NT_STATUS_NO_MEMORY);
	}

	nt_status = ntlmssp_auth_context->check_ntlm_password(ntlmssp_auth_context, user_info, &server_info); 

	if (!NT_STATUS_IS_OK(nt_status)) {
		nt_status = do_map_to_guest(nt_status, &server_info, user, workgroup);
	}

	SAFE_FREE(workgroup);
	SAFE_FREE(machine);
			
	(ntlmssp_auth_context->free)(&ntlmssp_auth_context);

	free_user_info(&user_info);
	
	data_blob_free(&lmhash);
	
	data_blob_free(&nthash);

	if (!NT_STATUS_IS_OK(nt_status)) {
		SAFE_FREE(user);
		return ERROR_NT(nt_status_squash(nt_status));
	}

	as_guest = server_info->guest;

	sess_vuid = register_vuid(server_info, user);
	free_server_info(&server_info);

	SAFE_FREE(user);
  
	if (sess_vuid == -1) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	set_message(outbuf,4,0,True);
	SSVAL(outbuf, smb_vwv3, 0);

	if (as_guest) {
		SSVAL(outbuf,smb_vwv2,1);
	}

	add_signature(outbuf);
 
	SSVAL(outbuf,smb_uid,sess_vuid);
	SSVAL(inbuf,smb_uid,sess_vuid);

        response = spnego_gen_auth_response();
	reply_sesssetup_blob(conn, outbuf, response, 0);

	/* and tell smbd that we have already replied to this packet */
	return -1;
}


/****************************************************************************
reply to a session setup spnego anonymous packet
****************************************************************************/
static int reply_spnego_anonymous(connection_struct *conn, char *inbuf, char *outbuf,
				  int length, int bufsize)
{
	int sess_vuid;
	auth_serversupplied_info *server_info = NULL;
	NTSTATUS nt_status;

	nt_status = check_guest_password(&server_info);

	if (!NT_STATUS_IS_OK(nt_status)) {
		return ERROR_NT(nt_status_squash(nt_status));
	}

	sess_vuid = register_vuid(server_info, lp_guestaccount());

	free_server_info(&server_info);
  
	if (sess_vuid == -1) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	set_message(outbuf,4,0,True);
	SSVAL(outbuf, smb_vwv3, 0);
	add_signature(outbuf);
 
	SSVAL(outbuf,smb_uid,sess_vuid);
	SSVAL(inbuf,smb_uid,sess_vuid);
	
	return chain_reply(inbuf,outbuf,length,bufsize);
}


/****************************************************************************
reply to a session setup command
****************************************************************************/
static int reply_sesssetup_and_X_spnego(connection_struct *conn, char *inbuf,char *outbuf,
					int length,int bufsize)
{
	uint8 *p;
	DATA_BLOB blob1;
	int ret;

	DEBUG(3,("Doing spnego session setup\n"));

	if (global_client_caps == 0) {
		global_client_caps = IVAL(inbuf,smb_vwv10);
	}
		
	p = (uint8 *)smb_buf(inbuf);

	if (SVAL(inbuf, smb_vwv7) == 0) {
		/* an anonymous request */
		return reply_spnego_anonymous(conn, inbuf, outbuf, length, bufsize);
	}

	/* pull the spnego blob */
	blob1 = data_blob(p, SVAL(inbuf, smb_vwv7));

#if 0
	file_save("negotiate.dat", blob1.data, blob1.length);
#endif

	if (blob1.data[0] == ASN1_APPLICATION(0)) {
		/* its a negTokenTarg packet */
		ret = reply_spnego_negotiate(conn, inbuf, outbuf, length, bufsize, blob1);
		data_blob_free(&blob1);
		return ret;
	}

	if (blob1.data[0] == ASN1_CONTEXT(1)) {
		/* its a auth packet */
		ret = reply_spnego_auth(conn, inbuf, outbuf, length, bufsize, blob1);
		data_blob_free(&blob1);
		return ret;
	}

	/* what sort of packet is this? */
	DEBUG(1,("Unknown packet in reply_sesssetup_and_X_spnego\n"));

	data_blob_free(&blob1);

	return ERROR_NT(NT_STATUS_LOGON_FAILURE);
}


/****************************************************************************
reply to a session setup command
****************************************************************************/
int reply_sesssetup_and_X(connection_struct *conn, char *inbuf,char *outbuf,
			  int length,int bufsize)
{
	int sess_vuid;
	int   smb_bufsize;    
	DATA_BLOB lm_resp;
	DATA_BLOB nt_resp;
	DATA_BLOB plaintext_password;
	pstring user;
	pstring sub_user; /* Sainitised username for substituion */
	fstring domain;
	fstring native_os;
	fstring native_lanman;
	static BOOL done_sesssetup = False;
	extern BOOL global_encrypted_passwords_negotiated;
	extern BOOL global_spnego_negotiated;
	extern int Protocol;
	extern userdom_struct current_user_info;
	extern int max_send;

	auth_usersupplied_info *user_info = NULL;
	extern struct auth_context *negprot_global_auth_context;
	auth_serversupplied_info *server_info = NULL;

	NTSTATUS nt_status;

	BOOL doencrypt = global_encrypted_passwords_negotiated;
	
	START_PROFILE(SMBsesssetupX);

	ZERO_STRUCT(lm_resp);
	ZERO_STRUCT(nt_resp);
	ZERO_STRUCT(plaintext_password);

	DEBUG(3,("wct=%d flg2=0x%x\n", CVAL(inbuf, smb_wct), SVAL(inbuf, smb_flg2)));

	/* a SPNEGO session setup has 12 command words, whereas a normal
	   NT1 session setup has 13. See the cifs spec. */
	if (CVAL(inbuf, smb_wct) == 12 &&
	    (SVAL(inbuf, smb_flg2) & FLAGS2_EXTENDED_SECURITY)) {
		if (!global_spnego_negotiated) {
			DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt at SPNEGO session setup when it was not negoitiated.\n"));
			return ERROR_NT(NT_STATUS_UNSUCCESSFUL);
		}

		return reply_sesssetup_and_X_spnego(conn, inbuf, outbuf, length, bufsize);
	}

	smb_bufsize = SVAL(inbuf,smb_vwv2);

	if (Protocol < PROTOCOL_NT1) {
		uint16 passlen1 = SVAL(inbuf,smb_vwv7);
		if ((passlen1 > MAX_PASS_LEN) || (passlen1 > smb_bufrem(inbuf, smb_buf(inbuf)))) {
			return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
		}

		if (doencrypt) {
			lm_resp = data_blob(smb_buf(inbuf), passlen1);
		} else {
			plaintext_password = data_blob(smb_buf(inbuf), passlen1+1);
			/* Ensure null termination */
			plaintext_password.data[passlen1] = 0;
		}

		srvstr_pull_buf(inbuf, user, smb_buf(inbuf)+passlen1, sizeof(user), STR_TERMINATE);
		*domain = 0;
  
	} else {
		uint16 passlen1 = SVAL(inbuf,smb_vwv7);
		uint16 passlen2 = SVAL(inbuf,smb_vwv8);
		enum remote_arch_types ra_type = get_remote_arch();
		char *p = smb_buf(inbuf);    

		if(global_client_caps == 0)
			global_client_caps = IVAL(inbuf,smb_vwv11);
		
		/* client_caps is used as final determination if client is NT or Win95. 
		   This is needed to return the correct error codes in some
		   circumstances.
		*/
		
		if(ra_type == RA_WINNT || ra_type == RA_WIN2K || ra_type == RA_WIN95) {
			if(!(global_client_caps & (CAP_NT_SMBS | CAP_STATUS32))) {
				set_remote_arch( RA_WIN95);
			}
		}
		
		if (!doencrypt) {
			/* both Win95 and WinNT stuff up the password lengths for
			   non-encrypting systems. Uggh. 
			   
			   if passlen1==24 its a win95 system, and its setting the
			   password length incorrectly. Luckily it still works with the
			   default code because Win95 will null terminate the password
			   anyway 
			   
			   if passlen1>0 and passlen2>0 then maybe its a NT box and its
			   setting passlen2 to some random value which really stuffs
			   things up. we need to fix that one.  */
			
			if (passlen1 > 0 && passlen2 > 0 && passlen2 != 24 && passlen2 != 1)
				passlen2 = 0;
		}
		
		/* check for nasty tricks */
		if (passlen1 > MAX_PASS_LEN || passlen1 > smb_bufrem(inbuf, p)) {
			return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
		}

		if (passlen2 > MAX_PASS_LEN || passlen2 > smb_bufrem(inbuf, p+passlen1)) {
			return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
		}

		/* Save the lanman2 password and the NT md4 password. */
		
		if ((doencrypt) && (passlen1 != 0) && (passlen1 != 24)) {
			doencrypt = False;
		}

		if (doencrypt) {
			lm_resp = data_blob(p, passlen1);
			nt_resp = data_blob(p+passlen1, passlen2);
		} else {
			pstring pass;
			srvstr_pull(inbuf, pass, smb_buf(inbuf), 
				    sizeof(pass),  passlen1, STR_TERMINATE);
			plaintext_password = data_blob(pass, strlen(pass)+1);
		}
		
		p += passlen1 + passlen2;
		p += srvstr_pull_buf(inbuf, user, p, sizeof(user), STR_TERMINATE);
		p += srvstr_pull_buf(inbuf, domain, p, sizeof(domain), STR_TERMINATE);
		p += srvstr_pull_buf(inbuf, native_os, p, sizeof(native_os), STR_TERMINATE);
		p += srvstr_pull_buf(inbuf, native_lanman, p, sizeof(native_lanman), STR_TERMINATE);
		DEBUG(3,("Domain=[%s]  NativeOS=[%s] NativeLanMan=[%s]\n",
			 domain,native_os,native_lanman));
	}
	
	/* don't allow for weird usernames or domains */
	alpha_strcpy(user, user, ". _-$", sizeof(user));
	alpha_strcpy(domain, domain, ". _-@", sizeof(domain));
	if (strstr(user, "..") || strstr(domain,"..")) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	DEBUG(3,("sesssetupX:name=[%s]\\[%s]@[%s]\n", domain, user, get_remote_machine_name()));

	if (*user) {
		if (global_spnego_negotiated) {
			
			/* This has to be here, becouse this is a perfectly valid behaviour for guest logons :-( */
			
			DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt at 'normal' session setup after negotiating spnego.\n"));
			return ERROR_NT(NT_STATUS_UNSUCCESSFUL);
		}
		pstrcpy(sub_user, user);

		/* setup the string used by %U */
		sub_set_smb_name(user);
	} else {
		pstrcpy(sub_user, lp_guestaccount());
	}

	pstrcpy(current_user_info.smb_name,sub_user);

	reload_services(True);
	
	if (lp_security() == SEC_SHARE) {
		/* in share level we should ignore any passwords */

		data_blob_free(&lm_resp);
		data_blob_free(&nt_resp);
		data_blob_clear_free(&plaintext_password);

		map_username(sub_user);
		add_session_user(sub_user);
		/* Then force it to null for the benfit of the code below */
		*user = 0;
	}
	
	if (!*user) {

		nt_status = check_guest_password(&server_info);

	} else if (doencrypt) {
		nt_status = make_user_info_for_reply_enc(&user_info, user, domain,
		                                         lm_resp, nt_resp);
		if (NT_STATUS_IS_OK(nt_status)) {
			nt_status = negprot_global_auth_context->check_ntlm_password(negprot_global_auth_context, 
										     user_info, 
										     &server_info);
		}
	} else {
		struct auth_context *plaintext_auth_context = NULL;
		const uint8 *chal;
		if (NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&plaintext_auth_context))) {
			chal = plaintext_auth_context->get_ntlm_challenge(plaintext_auth_context);
			
			if (!make_user_info_for_reply(&user_info, 
						      user, domain, chal,
						      plaintext_password)) {
				nt_status = NT_STATUS_NO_MEMORY;
			}
		
			if (NT_STATUS_IS_OK(nt_status)) {
				nt_status = plaintext_auth_context->check_ntlm_password(plaintext_auth_context, 
											user_info, 
											&server_info); 
				
				(plaintext_auth_context->free)(&plaintext_auth_context);
			}
		}
	}

	free_user_info(&user_info);
	
	data_blob_free(&lm_resp);
	data_blob_free(&nt_resp);
	data_blob_clear_free(&plaintext_password);
	
	if (!NT_STATUS_IS_OK(nt_status)) {
		nt_status = do_map_to_guest(nt_status, &server_info, user, domain);
	}
	
	if (!NT_STATUS_IS_OK(nt_status)) {
		return ERROR_NT(nt_status_squash(nt_status));
	}
	
	/* it's ok - setup a reply */
	if (Protocol < PROTOCOL_NT1) {
		set_message(outbuf,3,0,True);
	} else {
		set_message(outbuf,3,0,True);
		add_signature(outbuf);
		/* perhaps grab OS version here?? */
	}
	
	if (server_info->guest) {
		SSVAL(outbuf,smb_vwv2,1);
	}

	/* register the name and uid as being validated, so further connections
	   to a uid can get through without a password, on the same VC */

	sess_vuid = register_vuid(server_info, sub_user);

	free_server_info(&server_info);
  
	if (sess_vuid == -1) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

 
	SSVAL(outbuf,smb_uid,sess_vuid);
	SSVAL(inbuf,smb_uid,sess_vuid);
	
	if (!done_sesssetup)
		max_send = MIN(max_send,smb_bufsize);
	
	done_sesssetup = True;
	
	END_PROFILE(SMBsesssetupX);
	return chain_reply(inbuf,outbuf,length,bufsize);
}