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 <jmcd@us.ibm.com> 2002
   Copyright (C) Luke Howard          2003
   Copyright (C) Volker Lendecke      2007
   Copyright (C) Jeremy Allison	      2007

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

extern struct auth_context *negprot_global_auth_context;
extern bool global_encrypted_passwords_negotiated;
extern bool global_spnego_negotiated;
extern enum protocol_types Protocol;
extern int max_send;

uint32 global_client_caps = 0;

/*
  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 push_signature(uint8 **outbuf)
{
	char *lanman;
	int result, tmp;

	result = 0;

	tmp = message_push_string(outbuf, "Unix", STR_TERMINATE);

	if (tmp == -1) return -1;
	result += tmp;

	if (asprintf(&lanman, "Samba %s", SAMBA_VERSION_STRING) != -1) {
		tmp = message_push_string(outbuf, lanman, STR_TERMINATE);
		SAFE_FREE(lanman);
	}
	else {
		tmp = message_push_string(outbuf, "Samba", STR_TERMINATE);
	}

	if (tmp == -1) return -1;
	result += tmp;

	tmp = message_push_string(outbuf, lp_workgroup(), STR_TERMINATE);

	if (tmp == -1) return -1;
	result += tmp;

	return result;
}

/****************************************************************************
 Start the signing engine if needed. Don't fail signing here.
****************************************************************************/

static void sessionsetup_start_signing_engine(
			const auth_serversupplied_info *server_info,
			const uint8 *inbuf)
{
	if (!server_info->guest && !srv_signing_started()) {
		/* 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((char *)inbuf, False);
	}
}

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

static void reply_sesssetup_blob(struct smb_request *req,
				 DATA_BLOB blob,
				 NTSTATUS nt_status)
{
	if (!NT_STATUS_IS_OK(nt_status) &&
	    !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		reply_nterror(req, nt_status_squash(nt_status));
	} else {
		nt_status = nt_status_squash(nt_status);
		SIVAL(req->outbuf, smb_rcls, NT_STATUS_V(nt_status));
		SSVAL(req->outbuf, smb_vwv0, 0xFF); /* no chaining possible */
		SSVAL(req->outbuf, smb_vwv3, blob.length);

		if ((message_push_blob(&req->outbuf, blob) == -1)
		    || (push_signature(&req->outbuf) == -1)) {
			reply_nterror(req, NT_STATUS_NO_MEMORY);
		}
	}

	show_msg((char *)req->outbuf);
	srv_send_smb(smbd_server_fd(),(char *)req->outbuf,req->encrypted);
	TALLOC_FREE(req->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

#if 0
/* Experiment that failed. See "only happens with a KDC" comment below. */
/****************************************************************************
 Cerate a clock skew error blob for a Windows client.
****************************************************************************/

static bool make_krb5_skew_error(DATA_BLOB *pblob_out)
{
	krb5_context context = NULL;
	krb5_error_code kerr = 0;
	krb5_data reply;
	krb5_principal host_princ = NULL;
	char *host_princ_s = NULL;
	bool ret = False;

	*pblob_out = data_blob_null;

	initialize_krb5_error_table();
	kerr = krb5_init_context(&context);
	if (kerr) {
		return False;
	}
	/* Create server principal. */
	asprintf(&host_princ_s, "%s$@%s", global_myname(), lp_realm());
	if (!host_princ_s) {
		goto out;
	}
	strlower_m(host_princ_s);

	kerr = smb_krb5_parse_name(context, host_princ_s, &host_princ);
	if (kerr) {
		DEBUG(10,("make_krb5_skew_error: smb_krb5_parse_name failed "
			"for name %s: Error %s\n",
			host_princ_s, error_message(kerr) ));
		goto out;
	}

	kerr = smb_krb5_mk_error(context, KRB5KRB_AP_ERR_SKEW,
			host_princ, &reply);
	if (kerr) {
		DEBUG(10,("make_krb5_skew_error: smb_krb5_mk_error "
			"failed: Error %s\n",
			error_message(kerr) ));
		goto out;
	}

	*pblob_out = data_blob(reply.data, reply.length);
	kerberos_free_data_contents(context,&reply);
	ret = True;

  out:

	if (host_princ_s) {
		SAFE_FREE(host_princ_s);
	}
	if (host_princ) {
		krb5_free_principal(context, host_princ);
	}
	krb5_free_context(context);
	return ret;
}
#endif

/****************************************************************************
 Reply to a session setup spnego negotiate packet for kerberos.
****************************************************************************/

static void reply_spnego_kerberos(struct smb_request *req,
				  DATA_BLOB *secblob,
				  uint16 vuid,
				  bool *p_invalidate_vuid)
{
	TALLOC_CTX *mem_ctx;
	DATA_BLOB ticket;
	char *client, *p, *domain;
	fstring netbios_domain_name;
	struct passwd *pw;
	fstring user;
	int sess_vuid = req->vuid;
	NTSTATUS ret = NT_STATUS_OK;
	PAC_DATA *pac_data = NULL;
	DATA_BLOB ap_rep, ap_rep_wrapped, response;
	auth_serversupplied_info *server_info = NULL;
	DATA_BLOB session_key = data_blob_null;
	uint8 tok_id[2];
	DATA_BLOB nullblob = data_blob_null;
	fstring real_username;
	bool map_domainuser_to_guest = False;
	bool username_was_mapped;
	PAC_LOGON_INFO *logon_info = NULL;

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

	/* Normally we will always invalidate the intermediate vuid. */
	*p_invalidate_vuid = True;

	mem_ctx = talloc_init("reply_spnego_kerberos");
	if (mem_ctx == NULL) {
		reply_nterror(req, nt_status_squash(NT_STATUS_NO_MEMORY));
		return;
	}

	if (!spnego_parse_krb5_wrap(*secblob, &ticket, tok_id)) {
		talloc_destroy(mem_ctx);
		reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
		return;
	}

	ret = ads_verify_ticket(mem_ctx, lp_realm(), 0, &ticket,
				&client, &pac_data, &ap_rep,
				&session_key, True);

	data_blob_free(&ticket);

	if (!NT_STATUS_IS_OK(ret)) {
#if 0
		/* Experiment that failed.
		 * See "only happens with a KDC" comment below. */

		if (NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {

			/*
			 * Windows in this case returns
			 * NT_STATUS_MORE_PROCESSING_REQUIRED
			 * with a negTokenTarg blob containing an krb5_error
			 * struct ASN1 encoded containing KRB5KRB_AP_ERR_SKEW.
			 * The client then fixes its clock and continues rather
			 * than giving an error. JRA.
			 * -- Looks like this only happens with a KDC. JRA.
			 */

			bool ok = make_krb5_skew_error(&ap_rep);
			if (!ok) {
				talloc_destroy(mem_ctx);
				return ERROR_NT(nt_status_squash(
						NT_STATUS_LOGON_FAILURE));
			}
			ap_rep_wrapped = spnego_gen_krb5_wrap(ap_rep,
					TOK_ID_KRB_ERROR);
			response = spnego_gen_auth_response(&ap_rep_wrapped,
					ret, OID_KERBEROS5_OLD);
			reply_sesssetup_blob(conn, inbuf, outbuf, response,
					NT_STATUS_MORE_PROCESSING_REQUIRED);

			/*
			 * In this one case we don't invalidate the
			 * intermediate vuid as we're expecting the client
			 * to re-use it for the next sessionsetupX packet. JRA.
			 */

			*p_invalidate_vuid = False;

			data_blob_free(&ap_rep);
			data_blob_free(&ap_rep_wrapped);
			data_blob_free(&response);
			talloc_destroy(mem_ctx);
			return -1; /* already replied */
		}
#else
		if (!NT_STATUS_EQUAL(ret, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
			ret = NT_STATUS_LOGON_FAILURE;
		}
#endif
		DEBUG(1,("Failed to verify incoming ticket with error %s!\n",
				nt_errstr(ret)));
		talloc_destroy(mem_ctx);
		reply_nterror(req, nt_status_squash(ret));
		return;
	}

	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);
		data_blob_free(&session_key);
		SAFE_FREE(client);
		talloc_destroy(mem_ctx);
		reply_nterror(req,nt_status_squash(NT_STATUS_LOGON_FAILURE));
		return;
	}

	*p = 0;

	/* save the PAC data if we have it */

	if (pac_data) {
		logon_info = get_logon_info_from_pac(pac_data);
		if (logon_info) {
			netsamlogon_cache_store( client, &logon_info->info3 );
		}
	}

	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);
			data_blob_free(&session_key);
			SAFE_FREE(client);
			talloc_destroy(mem_ctx);
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			return;
		}
	}

	/* this gives a fully qualified user name (ie. with full realm).
	   that leads to very long usernames, but what else can we do? */

	domain = p+1;

	if (logon_info && logon_info->info3.hdr_logon_dom.uni_str_len) {
		unistr2_to_ascii(netbios_domain_name,
				&logon_info->info3.uni_logon_dom,
				sizeof(netbios_domain_name));
		domain = netbios_domain_name;
		DEBUG(10, ("Mapped to [%s] (using PAC)\n", domain));

	} else {

		/* If we have winbind running, we can (and must) shorten the
		   username by using the short netbios name. Otherwise we will
		   have inconsistent user names. With Kerberos, we get the
		   fully qualified realm, with ntlmssp we get the short
		   name. And even w2k3 does use ntlmssp if you for example
		   connect to an ip address. */

		struct winbindd_request wb_request;
		struct winbindd_response wb_response;
		NSS_STATUS wb_result;

		ZERO_STRUCT(wb_request);
		ZERO_STRUCT(wb_response);

		DEBUG(10, ("Mapping [%s] to short name\n", domain));

		fstrcpy(wb_request.domain_name, domain);

		wb_result = winbindd_request_response(WINBINDD_DOMAIN_INFO,
					     &wb_request, &wb_response);

		if (wb_result == NSS_STATUS_SUCCESS) {

			fstrcpy(netbios_domain_name,
				wb_response.data.domain_info.name);
			domain = netbios_domain_name;

			DEBUG(10, ("Mapped to [%s] (using Winbind)\n", domain));
		} else {
			DEBUG(3, ("Could not find short name -- winbind "
				  "not running?\n"));
		}
	}

	fstr_sprintf(user, "%s%c%s", domain, *lp_winbind_separator(), client);

	/* lookup the passwd struct, create a new user if necessary */

	username_was_mapped = map_username( user );

	pw = smb_getpwnam( mem_ctx, user, real_username, True );

	if (pw) {
		/* if a real user check pam account restrictions */
		/* only really perfomed if "obey pam restriction" is true */
		/* do this before an eventual mappign to guest occurs */
		ret = smb_pam_accountcheck(pw->pw_name);
		if (  !NT_STATUS_IS_OK(ret)) {
			DEBUG(1,("PAM account restriction "
				"prevents user login\n"));
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			TALLOC_FREE(mem_ctx);
			reply_nterror(req, nt_status_squash(ret));
			return;
		}
	}

	if (!pw) {

		/* this was originally the behavior of Samba 2.2, if a user
		   did not have a local uid but has been authenticated, then
		   map them to a guest account */

		if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID){
			map_domainuser_to_guest = True;
			fstrcpy(user,lp_guestaccount());
			pw = smb_getpwnam( mem_ctx, user, real_username, True );
		}

		/* extra sanity check that the guest account is valid */

		if ( !pw ) {
			DEBUG(1,("Username %s is invalid on this system\n",
				user));
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			TALLOC_FREE(mem_ctx);
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			return;
		}
	}

	/* setup the string used by %U */

	sub_set_smb_name( real_username );
	reload_services(True);

	if ( map_domainuser_to_guest ) {
		make_server_info_guest(&server_info);
	} else if (logon_info) {
		/* pass the unmapped username here since map_username()
		   will be called again from inside make_server_info_info3() */

		ret = make_server_info_info3(mem_ctx, client, domain,
					     &server_info, &logon_info->info3);
		if ( !NT_STATUS_IS_OK(ret) ) {
			DEBUG(1,("make_server_info_info3 failed: %s!\n",
				 nt_errstr(ret)));
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			TALLOC_FREE(mem_ctx);
			reply_nterror(req, nt_status_squash(ret));
			return;
		}

	} else {
		ret = make_server_info_pw(&server_info, real_username, pw);

		if ( !NT_STATUS_IS_OK(ret) ) {
			DEBUG(1,("make_server_info_pw failed: %s!\n",
				 nt_errstr(ret)));
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			TALLOC_FREE(mem_ctx);
			reply_nterror(req, nt_status_squash(ret));
			return;
		}

	        /* make_server_info_pw does not set the domain. Without this
		 * we end up with the local netbios name in substitutions for
		 * %D. */

		if (server_info->sam_account != NULL) {
			pdb_set_domain(server_info->sam_account,
					domain, PDB_SET);
		}
	}

	if (username_was_mapped) {
		server_info->was_mapped = username_was_mapped;
	}

	/* we need to build the token for the user. make_server_info_guest()
	   already does this */

	if ( !server_info->ptok ) {
		ret = create_local_token( server_info );
		if ( !NT_STATUS_IS_OK(ret) ) {
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			TALLOC_FREE( mem_ctx );
			TALLOC_FREE( server_info );
			reply_nterror(req, nt_status_squash(ret));
			return;
		}
	}

	/* register_existing_vuid keeps the server info */
	/* register_existing_vuid takes ownership of session_key on success,
	 * no need to free after this on success. A better interface would copy
	 * it.... */

	if (!is_partial_auth_vuid(sess_vuid)) {
		sess_vuid = register_initial_vuid();
	}
	sess_vuid = register_existing_vuid(sess_vuid,
					server_info,
					session_key,
					nullblob,
					client);

	SAFE_FREE(client);

	reply_outbuf(req, 4, 0);
	SSVAL(req->outbuf,smb_uid,sess_vuid);

	if (sess_vuid == UID_FIELD_INVALID ) {
		ret = NT_STATUS_LOGON_FAILURE;
		data_blob_free(&session_key);
	} else {
		/* current_user_info is changed on new vuid */
		reload_services( True );

		SSVAL(req->outbuf, smb_vwv3, 0);

		if (server_info->guest) {
			SSVAL(req->outbuf,smb_vwv2,1);
		}

		SSVAL(req->outbuf, smb_uid, sess_vuid);

		sessionsetup_start_signing_engine(server_info, req->inbuf);
		/* Successful logon. Keep this vuid. */
		*p_invalidate_vuid = False;
	}

        /* 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;
	}
	response = spnego_gen_auth_response(&ap_rep_wrapped, ret,
			OID_KERBEROS5_OLD);
	reply_sesssetup_blob(req, response, ret);

	data_blob_free(&ap_rep);
	data_blob_free(&ap_rep_wrapped);
	data_blob_free(&response);
	TALLOC_FREE(mem_ctx);
}

#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
 This should be split into two functions, one to handle each
 leg of the NTLM auth steps.
***************************************************************************/

static void reply_spnego_ntlmssp(struct smb_request *req,
				 uint16 vuid,
				 AUTH_NTLMSSP_STATE **auth_ntlmssp_state,
				 DATA_BLOB *ntlmssp_blob, NTSTATUS nt_status,
				 bool wrap)
{
	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);
	}

	reply_outbuf(req, 4, 0);

	SSVAL(req->outbuf, smb_uid, vuid);

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

		if (!is_partial_auth_vuid(vuid)) {
			data_blob_free(&session_key);
			nt_status = NT_STATUS_LOGON_FAILURE;
			goto out;
		}
		/* register_existing_vuid keeps the server info */
		if (register_existing_vuid(vuid,
				server_info,
				session_key, nullblob,
				(*auth_ntlmssp_state)->ntlmssp_state->user) !=
					vuid) {
			data_blob_free(&session_key);
			nt_status = NT_STATUS_LOGON_FAILURE;
			goto out;
		}

		(*auth_ntlmssp_state)->server_info = NULL;

		/* current_user_info is changed on new vuid */
		reload_services( True );

		SSVAL(req->outbuf, smb_vwv3, 0);

		if (server_info->guest) {
			SSVAL(req->outbuf,smb_vwv2,1);
		}

		sessionsetup_start_signing_engine(server_info,
						  (uint8 *)req->inbuf);
	}

  out:

	if (wrap) {
		response = spnego_gen_auth_response(ntlmssp_blob,
				nt_status, OID_NTLMSSP);
	} else {
		response = *ntlmssp_blob;
	}

	reply_sesssetup_blob(req, response, nt_status);
	if (wrap) {
		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 (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		/* NB. This is *NOT* an error case. JRA */
		auth_ntlmssp_end(auth_ntlmssp_state);
		if (!NT_STATUS_IS_OK(nt_status)) {
			/* Kill the intermediate vuid */
			invalidate_vuid(vuid);
		}
	}
}

/****************************************************************************
 Is this a krb5 mechanism ?
****************************************************************************/

NTSTATUS parse_spnego_mechanisms(DATA_BLOB blob_in, DATA_BLOB *pblob_out,
		bool *p_is_krb5)
{
	char *OIDs[ASN1_MAX_OIDS];
	int i;

	*p_is_krb5 = False;

	/* parse out the OIDs and the first sec blob */
	if (!parse_negTokenTarg(blob_in, OIDs, pblob_out)) {
		return NT_STATUS_LOGON_FAILURE;
	}

	/* only look at the first OID for determining the mechToken --
	   according 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              */

#ifdef HAVE_KRB5
	if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 ||
	    strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
		*p_is_krb5 = True;
	}
#endif

	for (i=0;OIDs[i];i++) {
		DEBUG(5,("parse_spnego_mechanisms: Got OID %s\n", OIDs[i]));
		free(OIDs[i]);
	}
	return NT_STATUS_OK;
}

/****************************************************************************
 Reply to a session setup spnego negotiate packet.
****************************************************************************/

static void reply_spnego_negotiate(struct smb_request *req,
				   uint16 vuid,
				   DATA_BLOB blob1,
				   AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
{
	DATA_BLOB secblob;
	DATA_BLOB chal;
	bool got_kerberos_mechanism = False;
	NTSTATUS status;

	status = parse_spnego_mechanisms(blob1, &secblob,
			&got_kerberos_mechanism);
	if (!NT_STATUS_IS_OK(status)) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);
		reply_nterror(req, nt_status_squash(status));
		return;
	}

	DEBUG(3,("reply_spnego_negotiate: Got secblob of size %lu\n",
				(unsigned long)secblob.length));

#ifdef HAVE_KRB5
	if ( got_kerberos_mechanism && ((lp_security()==SEC_ADS) ||
				lp_use_kerberos_keytab()) ) {
		bool destroy_vuid = True;
		reply_spnego_kerberos(req, &secblob, vuid,
				      &destroy_vuid);
		data_blob_free(&secblob);
		if (destroy_vuid) {
			/* Kill the intermediate vuid */
			invalidate_vuid(vuid);
		}
		return;
	}
#endif

	if (*auth_ntlmssp_state) {
		auth_ntlmssp_end(auth_ntlmssp_state);
	}

	status = auth_ntlmssp_start(auth_ntlmssp_state);
	if (!NT_STATUS_IS_OK(status)) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);
		reply_nterror(req, nt_status_squash(status));
		return;
	}

	status = auth_ntlmssp_update(*auth_ntlmssp_state,
					secblob, &chal);

	data_blob_free(&secblob);

	reply_spnego_ntlmssp(req, vuid, auth_ntlmssp_state,
			     &chal, status, True);

	data_blob_free(&chal);

	/* already replied */
	return;
}

/****************************************************************************
 Reply to a session setup spnego auth packet.
****************************************************************************/

static void reply_spnego_auth(struct smb_request *req,
			      uint16 vuid,
			      DATA_BLOB blob1,
			      AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
{
	DATA_BLOB auth = data_blob_null;
	DATA_BLOB auth_reply = data_blob_null;
	DATA_BLOB secblob = data_blob_null;
	NTSTATUS status = NT_STATUS_INVALID_PARAMETER;

	if (!spnego_parse_auth(blob1, &auth)) {
#if 0
		file_save("auth.dat", blob1.data, blob1.length);
#endif
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		reply_nterror(req, nt_status_squash(
				      NT_STATUS_INVALID_PARAMETER));
		return;
	}

	if (auth.data[0] == ASN1_APPLICATION(0)) {
		/* Might be a second negTokenTarg packet */

		bool got_krb5_mechanism = False;
		status = parse_spnego_mechanisms(auth, &secblob,
				&got_krb5_mechanism);
		if (NT_STATUS_IS_OK(status)) {
			DEBUG(3,("reply_spnego_auth: Got secblob of size %lu\n",
					(unsigned long)secblob.length));
#ifdef HAVE_KRB5
			if ( got_krb5_mechanism && ((lp_security()==SEC_ADS) ||
						lp_use_kerberos_keytab()) ) {
				bool destroy_vuid = True;
				reply_spnego_kerberos(req, &secblob,
						      vuid, &destroy_vuid);
				data_blob_free(&secblob);
				data_blob_free(&auth);
				if (destroy_vuid) {
					/* Kill the intermediate vuid */
					invalidate_vuid(vuid);
				}
				return;
			}
#endif
		}
	}

	/* If we get here it wasn't a negTokenTarg auth packet. */
	data_blob_free(&secblob);

	if (!*auth_ntlmssp_state) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		/* auth before negotiatiate? */
		reply_nterror(req, nt_status_squash(
				      NT_STATUS_INVALID_PARAMETER));
		return;
	}

	status = auth_ntlmssp_update(*auth_ntlmssp_state,
					auth, &auth_reply);

	data_blob_free(&auth);

	reply_spnego_ntlmssp(req, vuid,
			     auth_ntlmssp_state,
			     &auth_reply, status, True);

	data_blob_free(&auth_reply);

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

/****************************************************************************
 List to store partial SPNEGO auth fragments.
****************************************************************************/

static struct pending_auth_data *pd_list;

/****************************************************************************
 Delete an entry on the list.
****************************************************************************/

static void delete_partial_auth(struct pending_auth_data *pad)
{
	if (!pad) {
		return;
	}
	DLIST_REMOVE(pd_list, pad);
	data_blob_free(&pad->partial_data);
	SAFE_FREE(pad);
}

/****************************************************************************
 Search for a partial SPNEGO auth fragment matching an smbpid.
****************************************************************************/

static struct pending_auth_data *get_pending_auth_data(uint16 smbpid)
{
	struct pending_auth_data *pad;

	for (pad = pd_list; pad; pad = pad->next) {
		if (pad->smbpid == smbpid) {
			break;
		}
	}
	return pad;
}

/****************************************************************************
 Check the size of an SPNEGO blob. If we need more return
 NT_STATUS_MORE_PROCESSING_REQUIRED, else return NT_STATUS_OK. Don't allow
 the blob to be more than 64k.
****************************************************************************/

static NTSTATUS check_spnego_blob_complete(uint16 smbpid, uint16 vuid,
		DATA_BLOB *pblob)
{
	struct pending_auth_data *pad = NULL;
	ASN1_DATA data;
	size_t needed_len = 0;

	pad = get_pending_auth_data(smbpid);

	/* Ensure we have some data. */
	if (pblob->length == 0) {
		/* Caller can cope. */
		DEBUG(2,("check_spnego_blob_complete: zero blob length !\n"));
		delete_partial_auth(pad);
		return NT_STATUS_OK;
	}

	/* Were we waiting for more data ? */
	if (pad) {
		DATA_BLOB tmp_blob;
		size_t copy_len = MIN(65536, pblob->length);

		/* Integer wrap paranoia.... */

		if (pad->partial_data.length + copy_len <
				pad->partial_data.length ||
		    pad->partial_data.length + copy_len < copy_len) {

			DEBUG(2,("check_spnego_blob_complete: integer wrap "
				"pad->partial_data.length = %u, "
				"copy_len = %u\n",
				(unsigned int)pad->partial_data.length,
				(unsigned int)copy_len ));

			delete_partial_auth(pad);
			return NT_STATUS_INVALID_PARAMETER;
		}

		DEBUG(10,("check_spnego_blob_complete: "
			"pad->partial_data.length = %u, "
			"pad->needed_len = %u, "
			"copy_len = %u, "
			"pblob->length = %u,\n",
			(unsigned int)pad->partial_data.length,
			(unsigned int)pad->needed_len,
			(unsigned int)copy_len,
			(unsigned int)pblob->length ));

		tmp_blob = data_blob(NULL,
				pad->partial_data.length + copy_len);

		/* Concatenate the two (up to copy_len) bytes. */
		memcpy(tmp_blob.data,
			pad->partial_data.data,
			pad->partial_data.length);
		memcpy(tmp_blob.data + pad->partial_data.length,
			pblob->data,
			copy_len);

		/* Replace the partial data. */
		data_blob_free(&pad->partial_data);
		pad->partial_data = tmp_blob;
		ZERO_STRUCT(tmp_blob);

		/* Are we done ? */
		if (pblob->length >= pad->needed_len) {
			/* Yes, replace pblob. */
			data_blob_free(pblob);
			*pblob = pad->partial_data;
			ZERO_STRUCT(pad->partial_data);
			delete_partial_auth(pad);
			return NT_STATUS_OK;
		}

		/* Still need more data. */
		pad->needed_len -= copy_len;
		return NT_STATUS_MORE_PROCESSING_REQUIRED;
	}

	if ((pblob->data[0] != ASN1_APPLICATION(0)) &&
	    (pblob->data[0] != ASN1_CONTEXT(1))) {
		/* Not something we can determine the
		 * length of.
		 */
		return NT_STATUS_OK;
	}

	/* This is a new SPNEGO sessionsetup - see if
	 * the data given in this blob is enough.
	 */

	asn1_load(&data, *pblob);
	asn1_start_tag(&data, pblob->data[0]);
	if (data.has_error || data.nesting == NULL) {
		asn1_free(&data);
		/* Let caller catch. */
		return NT_STATUS_OK;
	}

	/* Integer wrap paranoia.... */

	if (data.nesting->taglen + data.nesting->start < data.nesting->taglen ||
	    data.nesting->taglen + data.nesting->start < data.nesting->start) {

		DEBUG(2,("check_spnego_blob_complete: integer wrap "
			"data.nesting->taglen = %u, "
			"data.nesting->start = %u\n",
			(unsigned int)data.nesting->taglen,
			(unsigned int)data.nesting->start ));

		asn1_free(&data);
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* Total length of the needed asn1 is the tag length
	 * plus the current offset. */

	needed_len = data.nesting->taglen + data.nesting->start;
	asn1_free(&data);

	DEBUG(10,("check_spnego_blob_complete: needed_len = %u, "
		"pblob->length = %u\n",
		(unsigned int)needed_len,
		(unsigned int)pblob->length ));

	if (needed_len <= pblob->length) {
		/* Nothing to do - blob is complete. */
		return NT_STATUS_OK;
	}

	/* Refuse the blob if it's bigger than 64k. */
	if (needed_len > 65536) {
		DEBUG(2,("check_spnego_blob_complete: needed_len "
			"too large (%u)\n",
			(unsigned int)needed_len ));
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* We must store this blob until complete. */
	if (!(pad = SMB_MALLOC_P(struct pending_auth_data))) {
		return NT_STATUS_NO_MEMORY;
	}
	pad->needed_len = needed_len - pblob->length;
	pad->partial_data = data_blob(pblob->data, pblob->length);
	if (pad->partial_data.data == NULL) {
		SAFE_FREE(pad);
		return NT_STATUS_NO_MEMORY;
	}
	pad->smbpid = smbpid;
	pad->vuid = vuid;
	DLIST_ADD(pd_list, pad);

	return NT_STATUS_MORE_PROCESSING_REQUIRED;
}

/****************************************************************************
 Reply to a session setup command.
 conn POINTER CAN BE NULL HERE !
****************************************************************************/

static void reply_sesssetup_and_X_spnego(struct smb_request *req)
{
	uint8 *p;
	DATA_BLOB blob1;
	size_t bufrem;
	fstring native_os, native_lanman, primary_domain;
	const char *p2;
	uint16 data_blob_len = SVAL(req->inbuf, smb_vwv7);
	enum remote_arch_types ra_type = get_remote_arch();
	int vuid = SVAL(req->inbuf,smb_uid);
	user_struct *vuser = NULL;
	NTSTATUS status = NT_STATUS_OK;
	uint16 smbpid = req->smbpid;
	uint16 smb_flag2 = req->flags2;

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

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

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

	}

	p = (uint8 *)smb_buf(req->inbuf);

	if (data_blob_len == 0) {
		/* an invalid request */
		reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
		return;
	}

	bufrem = smb_bufrem(req->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 = (char *)req->inbuf + smb_vwv13 + data_blob_len;
	p2 += srvstr_pull_buf(req->inbuf, smb_flag2, native_os, p2,
			      sizeof(native_os), STR_TERMINATE);
	p2 += srvstr_pull_buf(req->inbuf, smb_flag2, native_lanman, p2,
			      sizeof(native_lanman), STR_TERMINATE);
	p2 += srvstr_pull_buf(req->inbuf, smb_flag2, primary_domain, p2,
			      sizeof(primary_domain), STR_TERMINATE);
	DEBUG(3,("NativeOS=[%s] NativeLanMan=[%s] PrimaryDomain=[%s]\n",
		native_os, native_lanman, primary_domain));

	if ( ra_type == RA_WIN2K ) {
		/* Vista sets neither the OS or lanman strings */

		if ( !strlen(native_os) && !strlen(native_lanman) )
			set_remote_arch(RA_VISTA);

		/* Windows 2003 doesn't set the native lanman string,
		   but does set primary domain which is a bug I think */

		if ( !strlen(native_lanman) ) {
			ra_lanman_string( primary_domain );
		} else {
			ra_lanman_string( native_lanman );
		}
	}

	/* Did we get a valid vuid ? */
	if (!is_partial_auth_vuid(vuid)) {
		/* No, then try and see if this is an intermediate sessionsetup
		 * for a large SPNEGO packet. */
		struct pending_auth_data *pad = get_pending_auth_data(smbpid);
		if (pad) {
			DEBUG(10,("reply_sesssetup_and_X_spnego: found "
				"pending vuid %u\n",
				(unsigned int)pad->vuid ));
			vuid = pad->vuid;
		}
	}

	/* Do we have a valid vuid now ? */
	if (!is_partial_auth_vuid(vuid)) {
		/* No, start a new authentication setup. */
		vuid = register_initial_vuid();
		if (vuid == UID_FIELD_INVALID) {
			data_blob_free(&blob1);
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_INVALID_PARAMETER));
			return;
		}
	}

	vuser = get_partial_auth_user_struct(vuid);
	/* This MUST be valid. */
	if (!vuser) {
		smb_panic("reply_sesssetup_and_X_spnego: invalid vuid.");
	}

	/* Large (greater than 4k) SPNEGO blobs are split into multiple
	 * sessionsetup requests as the Windows limit on the security blob
	 * field is 4k. Bug #4400. JRA.
	 */

	status = check_spnego_blob_complete(smbpid, vuid, &blob1);
	if (!NT_STATUS_IS_OK(status)) {
		if (!NT_STATUS_EQUAL(status,
				NT_STATUS_MORE_PROCESSING_REQUIRED)) {
			/* Real error - kill the intermediate vuid */
			invalidate_vuid(vuid);
		}
		data_blob_free(&blob1);
		reply_nterror(req, nt_status_squash(status));
		return;
	}

	if (blob1.data[0] == ASN1_APPLICATION(0)) {

		/* its a negTokenTarg packet */

		reply_spnego_negotiate(req, vuid, blob1,
				       &vuser->auth_ntlmssp_state);
		data_blob_free(&blob1);
		return;
	}

	if (blob1.data[0] == ASN1_CONTEXT(1)) {

		/* its a auth packet */

		reply_spnego_auth(req, vuid, blob1,
				  &vuser->auth_ntlmssp_state);
		data_blob_free(&blob1);
		return;
	}

	if (strncmp((char *)(blob1.data), "NTLMSSP", 7) == 0) {
		DATA_BLOB chal;

		if (!vuser->auth_ntlmssp_state) {
			status = auth_ntlmssp_start(&vuser->auth_ntlmssp_state);
			if (!NT_STATUS_IS_OK(status)) {
				/* Kill the intermediate vuid */
				invalidate_vuid(vuid);
				data_blob_free(&blob1);
				reply_nterror(req, nt_status_squash(status));
				return;
			}
		}

		status = auth_ntlmssp_update(vuser->auth_ntlmssp_state,
						blob1, &chal);

		data_blob_free(&blob1);

		reply_spnego_ntlmssp(req, vuid,
				     &vuser->auth_ntlmssp_state,
				     &chal, status, False);
		data_blob_free(&chal);
		return;
	}

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

	data_blob_free(&blob1);

	reply_nterror(req, nt_status_squash(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 int shutdown_other_smbds(struct db_record *rec,
				const struct connections_key *key,
				const struct connections_data *crec,
				void *private_data)
{
	const char *ip = (const char *)private_data;

	if (!process_exists(crec->pid)) {
		return 0;
	}

	if (procid_is_me(&crec->pid)) {
		return 0;
	}

	if (strcmp(ip, crec->addr) != 0) {
		return 0;
	}

	messaging_send(smbd_messaging_context(), crec->pid, MSG_SHUTDOWN,
		       &data_blob_null);
	return 0;
}

static void setup_new_vc_session(void)
{
	char addr[INET6_ADDRSTRLEN];

	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
	if (lp_reset_on_zero_vc()) {
		connections_forall(shutdown_other_smbds,
			CONST_DISCARD(void *,
			client_addr(get_client_fd(),addr,sizeof(addr))));
	}
}

/****************************************************************************
 Reply to a session setup command.
****************************************************************************/

void reply_sesssetup_and_X(struct smb_request *req)
{
	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;
	fstring primary_domain;
	static bool done_sesssetup = False;
	auth_usersupplied_info *user_info = NULL;
	auth_serversupplied_info *server_info = NULL;
	uint16 smb_flag2 = req->flags2;

	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", req->wct, req->flags2));

	/* a SPNEGO session setup has 12 command words, whereas a normal
	   NT1 session setup has 13. See the cifs spec. */
	if (req->wct == 12 &&
	    (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {

		if (!global_spnego_negotiated) {
			DEBUG(0,("reply_sesssetup_and_X:  Rejecting attempt "
				 "at SPNEGO session setup when it was not "
				 "negotiated.\n"));
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			END_PROFILE(SMBsesssetupX);
			return;
		}

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

		reply_sesssetup_and_X_spnego(req);
		END_PROFILE(SMBsesssetupX);
		return;
	}

	smb_bufsize = SVAL(req->inbuf,smb_vwv2);

	if (Protocol < PROTOCOL_NT1) {
		uint16 passlen1 = SVAL(req->inbuf,smb_vwv7);

		/* Never do NT status codes with protocols before NT1 as we
		 * don't get client caps. */
		remove_from_common_flags2(FLAGS2_32_BIT_ERROR_CODES);

		if ((passlen1 > MAX_PASS_LEN)
		    || (passlen1 > smb_bufrem(req->inbuf,
					      smb_buf(req->inbuf)))) {
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_INVALID_PARAMETER));
			END_PROFILE(SMBsesssetupX);
			return;
		}

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

		srvstr_pull_buf(req->inbuf, req->flags2, user,
				smb_buf(req->inbuf)+passlen1, sizeof(user),
				STR_TERMINATE);
		*domain = 0;

	} else {
		uint16 passlen1 = SVAL(req->inbuf,smb_vwv7);
		uint16 passlen2 = SVAL(req->inbuf,smb_vwv8);
		enum remote_arch_types ra_type = get_remote_arch();
		char *p = smb_buf(req->inbuf);
		char *save_p = smb_buf(req->inbuf);
		uint16 byte_count;


		if(global_client_caps == 0) {
			global_client_caps = IVAL(req->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(req->inbuf, p)) {
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_INVALID_PARAMETER));
			END_PROFILE(SMBsesssetupX);
			return;
		}

		if (passlen2 > MAX_PASS_LEN
		    || passlen2 > smb_bufrem(req->inbuf, p+passlen1)) {
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_INVALID_PARAMETER));
			END_PROFILE(SMBsesssetupX);
			return;
		}

		/* 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 {
			char *pass = NULL;
			bool unic= smb_flag2 & FLAGS2_UNICODE_STRINGS;

			if (unic && (passlen2 == 0) && passlen1) {
				/* Only a ascii plaintext password was sent. */
				(void)srvstr_pull_talloc(talloc_tos(),
							req->inbuf,
							req->flags2,
							&pass,
							smb_buf(req->inbuf),
							passlen1,
							STR_TERMINATE|STR_ASCII);
			} else {
				(void)srvstr_pull_talloc(talloc_tos(),
							req->inbuf,
							req->flags2,
							&pass,
							smb_buf(req->inbuf),
							unic ? passlen2 : passlen1,
							STR_TERMINATE);
			}
			if (!pass) {
				reply_nterror(req, nt_status_squash(
					      NT_STATUS_INVALID_PARAMETER));
				END_PROFILE(SMBsesssetupX);
				return;
			}
			plaintext_password = data_blob(pass, strlen(pass)+1);
		}

		p += passlen1 + passlen2;
		p += srvstr_pull_buf(req->inbuf, req->flags2, user, p,
				     sizeof(user), STR_TERMINATE);
		p += srvstr_pull_buf(req->inbuf, req->flags2, domain, p,
				     sizeof(domain), STR_TERMINATE);
		p += srvstr_pull_buf(req->inbuf, req->flags2, native_os,
				     p, sizeof(native_os), STR_TERMINATE);
		p += srvstr_pull_buf(req->inbuf, req->flags2,
				     native_lanman, p, sizeof(native_lanman),
				     STR_TERMINATE);

		/* not documented or decoded by Ethereal but there is one more
		 * string in the extra bytes which is the same as the
		 * PrimaryDomain when using extended security.  Windows NT 4
		 * and 2003 use this string to store the native lanman string.
		 * Windows 9x does not include a string here at all so we have
		 * to check if we have any extra bytes left */

		byte_count = SVAL(req->inbuf, smb_vwv13);
		if ( PTR_DIFF(p, save_p) < byte_count) {
			p += srvstr_pull_buf(req->inbuf, req->flags2,
					     primary_domain, p,
					     sizeof(primary_domain),
					     STR_TERMINATE);
		} else {
			fstrcpy( primary_domain, "null" );
		}

		DEBUG(3,("Domain=[%s]  NativeOS=[%s] NativeLanMan=[%s] "
			"PrimaryDomain=[%s]\n",
			domain, native_os, native_lanman, primary_domain));

		if ( ra_type == RA_WIN2K ) {
			if ( strlen(native_lanman) == 0 )
				ra_lanman_string( primary_domain );
			else
				ra_lanman_string( native_lanman );
		}

	}

	if (SVAL(req->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"));
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			END_PROFILE(SMBsesssetupX);
			return;
		}
		fstrcpy(sub_user, 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);
		add_session_workgroup(domain);
		/* 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"));
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			END_PROFILE(SMBsesssetupX);
			return;
		}
		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;

		nt_status = make_auth_context_subsystem(
				&plaintext_auth_context);

		if (NT_STATUS_IS_OK(nt_status)) {
			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);
		reply_nterror(req, nt_status_squash(nt_status));
		END_PROFILE(SMBsesssetupX);
		return;
	}

	/* Ensure we can't possible take a code path leading to a
	 * null defref. */
	if (!server_info) {
		reply_nterror(req, nt_status_squash(NT_STATUS_LOGON_FAILURE));
		END_PROFILE(SMBsesssetupX);
		return;
	}

	nt_status = create_local_token(server_info);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(10, ("create_local_token failed: %s\n",
			   nt_errstr(nt_status)));
		data_blob_free(&nt_resp);
		data_blob_free(&lm_resp);
		data_blob_clear_free(&plaintext_password);
		reply_nterror(req, nt_status_squash(nt_status));
		END_PROFILE(SMBsesssetupX);
		return;
	}

	if (server_info->user_session_key.data) {
		session_key = data_blob(server_info->user_session_key.data,
				server_info->user_session_key.length);
	} else {
		session_key = data_blob_null;
	}

	data_blob_clear_free(&plaintext_password);

	/* it's ok - setup a reply */
	reply_outbuf(req, 3, 0);
	if (Protocol >= PROTOCOL_NT1) {
		push_signature(&req->outbuf);
		/* perhaps grab OS version here?? */
	}

	if (server_info->guest) {
		SSVAL(req->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 */

	if (lp_security() == SEC_SHARE) {
		sess_vuid = UID_FIELD_INVALID;
		data_blob_free(&session_key);
		TALLOC_FREE(server_info);
	} else {
		/* Ignore the initial vuid. */
		sess_vuid = register_initial_vuid();
		if (sess_vuid == UID_FIELD_INVALID) {
			data_blob_free(&nt_resp);
			data_blob_free(&lm_resp);
			data_blob_free(&session_key);
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			END_PROFILE(SMBsesssetupX);
			return;
		}
		/* register_existing_vuid keeps the server info */
		sess_vuid = register_existing_vuid(sess_vuid,
					server_info,
					session_key,
					nt_resp.data ? nt_resp : lm_resp,
					sub_user);
		if (sess_vuid == UID_FIELD_INVALID) {
			data_blob_free(&nt_resp);
			data_blob_free(&lm_resp);
			data_blob_free(&session_key);
			reply_nterror(req, nt_status_squash(
					      NT_STATUS_LOGON_FAILURE));
			END_PROFILE(SMBsesssetupX);
			return;
		}

		/* current_user_info is changed on new vuid */
		reload_services( True );

		sessionsetup_start_signing_engine(server_info, req->inbuf);
	}

	data_blob_free(&nt_resp);
	data_blob_free(&lm_resp);

	SSVAL(req->outbuf,smb_uid,sess_vuid);
	SSVAL(req->inbuf,smb_uid,sess_vuid);

	if (!done_sesssetup)
		max_send = MIN(max_send,smb_bufsize);

	done_sesssetup = True;

	END_PROFILE(SMBsesssetupX);
	chain_reply(req);
	return;
}