summaryrefslogtreecommitdiff
path: root/source3/smbd/sesssetup.c
blob: 2c9676016783c611a43082bbca6fe516217df129 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
/* 
   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;

/*
  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);

	show_msg(outbuf);
	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)
{
	TALLOC_CTX *mem_ctx;
	DATA_BLOB ticket;
	char *client, *p, *domain;
	fstring netbios_domain_name;
	struct passwd *pw;
	fstring user;
	int sess_vuid;
	NTSTATUS ret;
	PAC_DATA *pac_data;
	DATA_BLOB ap_rep, ap_rep_wrapped, response;
	auth_serversupplied_info *server_info = NULL;
	DATA_BLOB session_key = data_blob(NULL, 0);
	uint8 tok_id[2];
	DATA_BLOB nullblob = data_blob(NULL, 0);
	fstring real_username;
	BOOL map_domainuser_to_guest = False;
	PAC_LOGON_INFO *logon_info = NULL;

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

	mem_ctx = talloc_init("reply_spnego_kerberos");
	if (mem_ctx == NULL)
		return ERROR_NT(NT_STATUS_NO_MEMORY);

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

	ret = ads_verify_ticket(mem_ctx, lp_realm(), &ticket, &client, &pac_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);
	}

	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);
		return ERROR_NT(NT_STATUS_LOGON_FAILURE);
	}

	*p = 0;

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

	if (pac_data) {
		logon_info = get_logon_info_from_pac(pac_data);
		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);
			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? */

	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, -1);
		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 */

	map_username( user );

	pw = smb_getpwnam( user, real_username, True );
	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( 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);
			return ERROR_NT(NT_STATUS_LOGON_FAILURE);
		}
	}

	/* 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) {
		ret = make_server_info_pac(&server_info, real_username, pw, logon_info);

		if ( !NT_STATUS_IS_OK(ret) ) {
			DEBUG(1,("make_server_info_pac failed!\n"));
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			passwd_free(&pw);
			return ERROR_NT(ret);
		}

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

		if ( !NT_STATUS_IS_OK(ret) ) {
			DEBUG(1,("make_server_info_from_pw failed!\n"));
			SAFE_FREE(client);
			data_blob_free(&ap_rep);
			data_blob_free(&session_key);
			passwd_free(&pw);
			return ERROR_NT(ret);
		}

	        /* 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);
		}
	}


	passwd_free(&pw);

	/* register_vuid keeps the server info */
	/* register_vuid takes ownership of session_key, no need to free after this.
 	   A better interface would copy it.... */
	sess_vuid = register_vuid(server_info, session_key, nullblob, client);

	SAFE_FREE(client);

	if (sess_vuid == -1) {
		ret = NT_STATUS_LOGON_FAILURE;
	} else {
		/* current_user_info is changed on new vuid */
		reload_services( True );

		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 && !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(inbuf, 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, 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);
	talloc_destroy(mem_ctx);

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

static BOOL reply_spnego_ntlmssp(connection_struct *conn, char *inbuf, char *outbuf,
				 uint16 vuid,
				 AUTH_NTLMSSP_STATE **auth_ntlmssp_state,
				 DATA_BLOB *ntlmssp_blob, NTSTATUS nt_status, 
				 BOOL wrap) 
{
	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 {
			
			/* current_user_info is changed on new vuid */
			reload_services( True );

			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 && !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(inbuf, False);
			}
		}
	}

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

	ret = reply_sesssetup_blob(conn, outbuf, 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 (!ret || !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		/* NB. This is *NOT* an error case. JRA */
		auth_ntlmssp_end(auth_ntlmssp_state);
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);
	}

	return ret;
}

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

static int reply_spnego_negotiate(connection_struct *conn, 
				  char *inbuf,
				  char *outbuf,
				  uint16 vuid,
				  int length, int bufsize,
				  DATA_BLOB blob1,
				  AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
{
	char *OIDs[ASN1_MAX_OIDS];
	DATA_BLOB secblob;
	int i;
	DATA_BLOB chal;
#ifdef HAVE_KRB5
	BOOL got_kerberos_mechanism = False;
#endif
	NTSTATUS nt_status;

	/* parse out the OIDs and the first sec blob */
	if (!parse_negTokenTarg(blob1, OIDs, &secblob)) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		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              */

#ifdef HAVE_KRB5	
	if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 ||
	    strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
		got_kerberos_mechanism = True;
	}
#endif
		
	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_mechanism && ((lp_security()==SEC_ADS) || lp_use_kerberos_keytab()) ) {
		int ret = reply_spnego_kerberos(conn, inbuf, outbuf, 
						length, bufsize, &secblob);
		data_blob_free(&secblob);
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		return ret;
	}
#endif

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

	nt_status = auth_ntlmssp_start(auth_ntlmssp_state);
	if (!NT_STATUS_IS_OK(nt_status)) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		return ERROR_NT(nt_status);
	}

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

	data_blob_free(&secblob);

	reply_spnego_ntlmssp(conn, inbuf, outbuf, vuid, auth_ntlmssp_state,
			     &chal, nt_status, True);

	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,
			     uint16 vuid,
			     int length, int bufsize,
			     DATA_BLOB blob1,
			     AUTH_NTLMSSP_STATE **auth_ntlmssp_state)
{
	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
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}
	
	if (!*auth_ntlmssp_state) {
		/* Kill the intermediate vuid */
		invalidate_vuid(vuid);

		/* auth before negotiatiate? */
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}
	
	nt_status = auth_ntlmssp_update(*auth_ntlmssp_state, 
					auth, &auth_reply);

	data_blob_free(&auth);

	reply_spnego_ntlmssp(conn, inbuf, outbuf, vuid, 
			     auth_ntlmssp_state,
			     &auth_reply, nt_status, True);
		
	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, primary_domain;
	char *p2;
	uint16 data_blob_len = SVAL(inbuf, smb_vwv7);
	enum remote_arch_types ra_type = get_remote_arch();
	int vuid = SVAL(inbuf,smb_uid);
	user_struct *vuser = NULL;

	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);
	p2 += srvstr_pull_buf(inbuf, 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 ) {
		/* 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 );
	}
		
	vuser = get_partial_auth_user_struct(vuid);
	if (!vuser) {
		vuid = register_vuid(NULL, data_blob(NULL, 0), data_blob(NULL, 0), NULL);
		if (vuid == -1) {
			return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
		}
	
		vuser = get_partial_auth_user_struct(vuid);
	}

	if (!vuser) {
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}
	
	SSVAL(outbuf,smb_uid,vuid);
	
	if (blob1.data[0] == ASN1_APPLICATION(0)) {
		/* its a negTokenTarg packet */
		ret = reply_spnego_negotiate(conn, inbuf, outbuf, vuid, length, bufsize, blob1,
					     &vuser->auth_ntlmssp_state);
		data_blob_free(&blob1);
		return ret;
	}

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

	if (strncmp((char *)(blob1.data), "NTLMSSP", 7) == 0) {
		DATA_BLOB chal;
		NTSTATUS nt_status;
		if (!vuser->auth_ntlmssp_state) {
			nt_status = auth_ntlmssp_start(&vuser->auth_ntlmssp_state);
			if (!NT_STATUS_IS_OK(nt_status)) {
				/* Kill the intermediate vuid */
				invalidate_vuid(vuid);
				
				return ERROR_NT(nt_status);
			}
		}

		nt_status = auth_ntlmssp_update(vuser->auth_ntlmssp_state,
						blob1, &chal);
		
		data_blob_free(&blob1);
		
		reply_spnego_ntlmssp(conn, inbuf, outbuf, vuid, 
					   &vuser->auth_ntlmssp_state,
					   &chal, nt_status, False);
		data_blob_free(&chal);
		return -1;
	}

	/* 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;
	fstring primary_domain;
	static BOOL done_sesssetup = False;
	extern BOOL global_encrypted_passwords_negotiated;
	extern BOOL global_spnego_negotiated;
	extern enum protocol_types 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_LOGON_FAILURE);
		}

		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);

		/* 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(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);    
		char *save_p = smb_buf(inbuf);
		uint16 byte_count;
			

		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=SVAL(inbuf, smb_flg2) & FLAGS2_UNICODE_STRINGS;

#if 0
			/* This was the previous fix. Not sure if it's still valid. JRA. */
			if ((ra_type == RA_WINNT) && (passlen2 == 0) && unic && passlen1) {
				/* NT4.0 stuffs up plaintext unicode password lengths... */
				srvstr_pull(inbuf, pass, smb_buf(inbuf) + 1,
					sizeof(pass), passlen1, STR_TERMINATE);
#endif

			if (unic && (passlen2 == 0) && passlen1) {
				/* Only a ascii plaintext password was sent. */
				srvstr_pull(inbuf, pass, smb_buf(inbuf), sizeof(pass),
					passlen1, STR_TERMINATE|STR_ASCII);
			} else {
				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);

		/* 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(inbuf, smb_vwv13);
		if ( PTR_DIFF(p, save_p) < byte_count)
			p += srvstr_pull_buf(inbuf, 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(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_LOGON_FAILURE);
		}
		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);
		/* 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->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, 0);
	}

	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.data ? nt_resp : lm_resp, sub_user);
	data_blob_free(&nt_resp);
	data_blob_free(&lm_resp);

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

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

 	if (!server_info->guest && !srv_signing_started() && !srv_check_sign_mac(inbuf, True)) {
		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);
}