path: root/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 <jmcd@us.ibm.com> 2002
   Copyright (C) Luke Howard          2003

   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_ntlmssp_state *global_ntlmssp_state;

/*
  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));
			status = make_server_info_guest(server_info);
		}
	}

	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));
			status = make_server_info_guest(server_info);
		}
	}

	return status;
}

/****************************************************************************
 Add the standard 'Samba' signature to the end of the session setup.
****************************************************************************/

static int add_signature(char *outbuf, char *p)
{
	char *start = p;
	fstring lanman;

	fstr_sprintf( lanman, "Samba %s", SAMBA_VERSION_STRING);

	p += srvstr_push(outbuf, p, "Unix", -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, lanman, -1, STR_TERMINATE);
	p += srvstr_push(outbuf, p, lp_workgroup(), -1, STR_TERMINATE);

	return PTR_DIFF(p, start);
}

/****************************************************************************
 Send a security blob via a session setup reply.
****************************************************************************/

static BOOL reply_sesssetup_blob(connection_struct *conn, char *outbuf,
				 DATA_BLOB blob, NTSTATUS nt_status)
{
	char *p;

	set_message(outbuf,4,0,True);

	nt_status = nt_status_squash(nt_status);
	SIVAL(outbuf, smb_rcls, NT_STATUS_V(nt_status));
	SSVAL(outbuf, smb_vwv0, 0xFF); /* no chaining possible */
	SSVAL(outbuf, smb_vwv3, blob.length);
	p = smb_buf(outbuf);

	/* should we cap this? */
	memcpy(p, blob.data, blob.length);
	p += blob.length;

	p += add_signature( outbuf, p );

	set_message_end(outbuf,p);

	return send_smb(smbd_server_fd(),outbuf);
}

/****************************************************************************
 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;
	DATA_BLOB ap_rep, ap_rep_wrapped, response;
	auth_serversupplied_info *server_info = NULL;
	DATA_BLOB session_key;
	uint8 tok_id[2];
	BOOL foreign = False;
	DATA_BLOB nullblob = data_blob(NULL, 0);

	ZERO_STRUCT(ticket);
	ZERO_STRUCT(auth_data);
	ZERO_STRUCT(ap_rep);
	ZERO_STRUCT(ap_rep_wrapped);
	ZERO_STRUCT(response);

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

	ret = ads_verify_ticket(lp_realm(), &ticket, &client, &auth_data, &ap_rep, &session_key);

	data_blob_free(&ticket);

	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(1,("Failed to verify incoming ticket!\n"));	
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	data_blob_free(&auth_data);

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

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

	*p = 0;
	if (!strequal(p+1, lp_realm())) {
		DEBUG(3,("Ticket for foreign realm %s@%s\n", client, p+1));
		if (!lp_allow_trusted_domains()) {
			data_blob_free(&ap_rep);
			SAFE_FREE(client);
			return ERROR_NT(NT_STATUS_LOGON_FAILURE);
		}
		foreign = True;
	}

	/* 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%c%s", p+1, *lp_winbind_separator(), client);
	
	pw = smb_getpwnam( user );
	
	SAFE_FREE(user);
	SAFE_FREE(client);

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

	/* setup the string used by %U */
	
	sub_set_smb_name(pw->pw_name);
	reload_services(True);
	
	if (!NT_STATUS_IS_OK(ret = make_server_info_pw(&server_info,pw))) {
		DEBUG(1,("make_server_info_from_pw failed!\n"));
		data_blob_free(&ap_rep);
		return ERROR_NT(ret);
	}

	/* register_vuid keeps the server info */
	sess_vuid = register_vuid(server_info, session_key, nullblob, user);

	free(user);

	if (sess_vuid == -1) {
		ret = NT_STATUS_LOGON_FAILURE;
	} else {
		set_message(outbuf,4,0,True);
		SSVAL(outbuf, smb_vwv3, 0);
			
		if (server_info->guest) {
			SSVAL(outbuf,smb_vwv2,1);
		}
		
		SSVAL(outbuf, smb_uid, sess_vuid);

		if (!server_info->guest) {
			/* We need to start the signing engine
			 * here but a W2K client sends the old
			 * "BSRSPYL " signature instead of the
			 * correct one. Subsequent packets will
			 * be correct.
			 */
		       	srv_check_sign_mac(inbuf);
		}
	}

        /* wrap that up in a nice GSS-API wrapping */
	if (NT_STATUS_IS_OK(ret)) {
		ap_rep_wrapped = spnego_gen_krb5_wrap(ap_rep, TOK_ID_KRB_AP_REP);
	} else {
		ap_rep_wrapped = data_blob(NULL, 0);
	}
	response = spnego_gen_auth_response(&ap_rep_wrapped, ret, OID_KERBEROS5_OLD);
	reply_sesssetup_blob(conn, outbuf, response, ret);

	data_blob_free(&ap_rep);
	data_blob_free(&ap_rep_wrapped);
	data_blob_free(&response);

	return -1; /* already replied */
}
#endif

/****************************************************************************
 Send a session setup reply, wrapped in SPNEGO.
 Get vuid and check first.
 End the NTLMSSP exchange context if we are OK/complete fail
***************************************************************************/

static BOOL reply_spnego_ntlmssp(connection_struct *conn, char *inbuf, char *outbuf,
				 AUTH_NTLMSSP_STATE **auth_ntlmssp_state,
				 DATA_BLOB *ntlmssp_blob, NTSTATUS nt_status) 
{
	BOOL ret;
	DATA_BLOB response;
	struct auth_serversupplied_info *server_info = NULL;

	if (NT_STATUS_IS_OK(nt_status)) {
		server_info = (*auth_ntlmssp_state)->server_info;
	} else {
		nt_status = do_map_to_guest(nt_status, 
					    &server_info, 
					    (*auth_ntlmssp_state)->ntlmssp_state->user, 
					    (*auth_ntlmssp_state)->ntlmssp_state->domain);
	}

	if (NT_STATUS_IS_OK(nt_status)) {
		int sess_vuid;
		DATA_BLOB nullblob = data_blob(NULL, 0);
		DATA_BLOB session_key = data_blob((*auth_ntlmssp_state)->ntlmssp_state->session_key.data, (*auth_ntlmssp_state)->ntlmssp_state->session_key.length);

		/* register_vuid keeps the server info */
		sess_vuid = register_vuid(server_info, session_key, nullblob, (*auth_ntlmssp_state)->ntlmssp_state->user);
		(*auth_ntlmssp_state)->server_info = NULL;

		if (sess_vuid == -1) {
			nt_status = NT_STATUS_LOGON_FAILURE;
		} else {
			
			set_message(outbuf,4,0,True);
			SSVAL(outbuf, smb_vwv3, 0);
			
			if (server_info->guest) {
				SSVAL(outbuf,smb_vwv2,1);
			}
			
			SSVAL(outbuf,smb_uid,sess_vuid);

			if (!server_info->guest) {
				/* We need to start the signing engine
				 * here but a W2K client sends the old
				 * "BSRSPYL " signature instead of the
				 * correct one. Subsequent packets will
				 * be correct.
				 */
			       	srv_check_sign_mac(inbuf);
			}
		}
	}

        response = spnego_gen_auth_response(ntlmssp_blob, nt_status, OID_NTLMSSP);
	ret = reply_sesssetup_blob(conn, outbuf, response, nt_status);
	data_blob_free(&response);

	/* NT_STATUS_MORE_PROCESSING_REQUIRED from our NTLMSSP code tells us,
	   and the other end, that we are not finished yet. */

	if (!ret || !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		auth_ntlmssp_end(auth_ntlmssp_state);
	}

	return ret;
}

/****************************************************************************
 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;
	DATA_BLOB chal;
	BOOL got_kerberos = False;
	NTSTATUS nt_status;

	/* parse out the OIDs and the first sec blob */
	if (!parse_negTokenTarg(blob1, OIDs, &secblob)) {
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	/* only look at the first OID for determining the mechToken --
	   accoirding to RFC2478, we should choose the one we want 
	   and renegotiate, but i smell a client bug here..  
	   
	   Problem observed when connecting to a member (samba box) 
	   of an AD domain as a user in a Samba domain.  Samba member 
	   server sent back krb5/mskrb5/ntlmssp as mechtypes, but the 
	   client (2ksp3) replied with ntlmssp/mskrb5/krb5 and an 
	   NTLMSSP mechtoken.                 --jerry              */
	
	if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 ||
	    strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
		got_kerberos = True;
	}
		
	for (i=0;OIDs[i];i++) {
		DEBUG(3,("Got OID %s\n", OIDs[i]));
		free(OIDs[i]);
	}
	DEBUG(3,("Got secblob of size %lu\n", (unsigned long)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

	if (global_ntlmssp_state) {
		auth_ntlmssp_end(&global_ntlmssp_state);
	}

	nt_status = auth_ntlmssp_start(&global_ntlmssp_state);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return ERROR_NT(nt_status);
	}

	nt_status = auth_ntlmssp_update(global_ntlmssp_state, 
					secblob, &chal);

	data_blob_free(&secblob);

	reply_spnego_ntlmssp(conn, inbuf, outbuf, &global_ntlmssp_state,
			     &chal, nt_status);
		
	data_blob_free(&chal);

	/* already replied */
	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, auth_reply;
	NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;

	if (!spnego_parse_auth(blob1, &auth)) {
#if 0
		file_save("auth.dat", blob1.data, blob1.length);
#endif
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}
	
	if (!global_ntlmssp_state) {
		/* auth before negotiatiate? */
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}
	
	nt_status = auth_ntlmssp_update(global_ntlmssp_state, 
						auth, &auth_reply);

	data_blob_free(&auth);

	reply_spnego_ntlmssp(conn, inbuf, outbuf, &global_ntlmssp_state,
			     &auth_reply, nt_status);
		
	data_blob_free(&auth_reply);

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

/****************************************************************************
 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;
	size_t bufrem;
	fstring native_os, native_lanman;
	char *p2;
	uint16 data_blob_len = SVAL(inbuf, smb_vwv7);
	enum remote_arch_types ra_type = get_remote_arch();

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

	if (global_client_caps == 0) {
		global_client_caps = IVAL(inbuf,smb_vwv10);

		if (!(global_client_caps & CAP_STATUS32)) {
			remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
		}

	}
		
	p = (uint8 *)smb_buf(inbuf);

	if (data_blob_len == 0) {
		/* an invalid request */
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	bufrem = smb_bufrem(inbuf, p);
	/* pull the spnego blob */
	blob1 = data_blob(p, MIN(bufrem, data_blob_len));

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

	p2 = inbuf + smb_vwv13 + data_blob_len;
	p2 += srvstr_pull_buf(inbuf, native_os, p2, sizeof(native_os), STR_TERMINATE);
	p2 += srvstr_pull_buf(inbuf, native_lanman, p2, sizeof(native_lanman), STR_TERMINATE);
	DEBUG(3,("NativeOS=[%s] NativeLanMan=[%s]\n", native_os, native_lanman));

	if ( ra_type == RA_WIN2K )
		ra_lanman_string( native_lanman );

	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);
}

/****************************************************************************
 On new VC == 0, shutdown *all* old connections and users.
 It seems that only NT4.x does this. At W2K and above (XP etc.).
 a new session setup with VC==0 is ignored.
****************************************************************************/

static void setup_new_vc_session(void)
{
	DEBUG(2,("setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all old resources.\n"));
#if 0
	conn_close_all();
	invalidate_all_vuids();
#endif
}

/****************************************************************************
 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;
	fstring user;
	fstring 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 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;

	DATA_BLOB session_key;
	
	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);
		}

		if (SVAL(inbuf,smb_vwv4) == 0) {
			setup_new_vc_session();
		}
		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);
		
			if (!(global_client_caps & CAP_STATUS32)) {
				remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);
			}

			/* 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;
			BOOL unic;
			unic=SVAL(inbuf, smb_flg2) & FLAGS2_UNICODE_STRINGS;
			srvstr_pull(inbuf, pass, smb_buf(inbuf), 
				    sizeof(pass),  unic ? passlen2 : 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));

		if ( ra_type == RA_WIN2K )
			ra_lanman_string( native_lanman );

	}

	if (SVAL(inbuf,smb_vwv4) == 0) {
		setup_new_vc_session();
	}

	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, because 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);
		}
		fstrcpy(sub_user, user);

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

	sub_set_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) {
		if (!negprot_global_auth_context) {
			DEBUG(0, ("reply_sesssetup_and_X:  Attempted encrypted session setup without negprot denied!\n"));
			return ERROR_NT(NT_STATUS_LOGON_FAILURE);
		}
		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);
	
	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)) {
		data_blob_free(&nt_resp);
		data_blob_free(&lm_resp);
		data_blob_clear_free(&plaintext_password);
		return ERROR_NT(nt_status_squash(nt_status));
	}

	if (server_info->nt_session_key.data) {
		session_key = data_blob(server_info->nt_session_key.data, server_info->nt_session_key.length);
	} else if (server_info->lm_session_key.length >= 8 && lm_resp.length == 24) {
		session_key = data_blob(NULL, 16);
		SMBsesskeygen_lmv1(server_info->lm_session_key.data, lm_resp.data, 
				   session_key.data);
	}

	data_blob_free(&lm_resp);
	data_blob_clear_free(&plaintext_password);
	
	/* it's ok - setup a reply */
	set_message(outbuf,3,0,True);
	if (Protocol >= PROTOCOL_NT1) {
		char *p = smb_buf( outbuf );
		p += add_signature( outbuf, p );
		set_message_end( outbuf, p );
		/* 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 */

	/* register_vuid keeps the server info */
	sess_vuid = register_vuid(server_info, session_key, nt_resp, sub_user);
	data_blob_free(&nt_resp);

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

 	if (!server_info->guest && !srv_check_sign_mac(inbuf)) {
		exit_server("reply_sesssetup_and_X: bad smb signature");
	}

	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);
}