summaryrefslogtreecommitdiff
path: root/source3/smbd/negprot.c
blob: 443fac4b4b833892b5d2c2e888a5d5c8553548c3 (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
/* 
   Unix SMB/CIFS implementation.
   negprot reply code
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Volker Lendecke 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"
#include "smbd/globals.h"
#include "../libcli/auth/spnego.h"

extern fstring remote_proto;

static void get_challenge(struct smbd_server_connection *sconn, uint8 buff[8])
{
	NTSTATUS nt_status;

	/* We might be called more than once, multiple negprots are
	 * permitted */
	if (sconn->smb1.negprot.auth_context) {
		DEBUG(3, ("get challenge: is this a secondary negprot? "
			  "sconn->negprot.auth_context is non-NULL!\n"));
			TALLOC_FREE(sconn->smb1.negprot.auth_context);
	}

	DEBUG(10, ("get challenge: creating negprot_global_auth_context\n"));
	nt_status = make_auth_context_subsystem(
		sconn, &sconn->smb1.negprot.auth_context);
	if (!NT_STATUS_IS_OK(nt_status)) {
		DEBUG(0, ("make_auth_context_subsystem returned %s",
			  nt_errstr(nt_status)));
		smb_panic("cannot make_negprot_global_auth_context!");
	}
	DEBUG(10, ("get challenge: getting challenge\n"));
	sconn->smb1.negprot.auth_context->get_ntlm_challenge(
		sconn->smb1.negprot.auth_context, buff);
}

/****************************************************************************
 Reply for the core protocol.
****************************************************************************/

static void reply_corep(struct smb_request *req, uint16 choice)
{
	reply_outbuf(req, 1, 0);
	SSVAL(req->outbuf, smb_vwv0, choice);

	set_Protocol(PROTOCOL_CORE);
}

/****************************************************************************
 Reply for the coreplus protocol.
****************************************************************************/

static void reply_coreplus(struct smb_request *req, uint16 choice)
{
	int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);

	reply_outbuf(req, 13, 0);

	SSVAL(req->outbuf,smb_vwv0,choice);
	SSVAL(req->outbuf,smb_vwv5,raw); /* tell redirector we support
			readbraw and writebraw (possibly) */
	/* Reply, SMBlockread, SMBwritelock supported. */
	SCVAL(req->outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
	SSVAL(req->outbuf,smb_vwv1,0x1); /* user level security, don't
					  * encrypt */
	set_Protocol(PROTOCOL_COREPLUS);
}

/****************************************************************************
 Reply for the lanman 1.0 protocol.
****************************************************************************/

static void reply_lanman1(struct smb_request *req, uint16 choice)
{
	int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
	int secword=0;
	time_t t = time(NULL);
	struct smbd_server_connection *sconn = req->sconn;

	sconn->smb1.negprot.encrypted_passwords = lp_encrypted_passwords();

	if (lp_security()>=SEC_USER) {
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;
	}
	if (sconn->smb1.negprot.encrypted_passwords) {
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
	}

	reply_outbuf(req, 13, sconn->smb1.negprot.encrypted_passwords?8:0);

	SSVAL(req->outbuf,smb_vwv0,choice);
	SSVAL(req->outbuf,smb_vwv1,secword);
	/* Create a token value and add it to the outgoing packet. */
	if (sconn->smb1.negprot.encrypted_passwords) {
		get_challenge(sconn, (uint8 *)smb_buf(req->outbuf));
		SSVAL(req->outbuf,smb_vwv11, 8);
	}

	set_Protocol(PROTOCOL_LANMAN1);

	/* Reply, SMBlockread, SMBwritelock supported. */
	SCVAL(req->outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
	SSVAL(req->outbuf,smb_vwv2,sconn->smb1.negprot.max_recv);
	SSVAL(req->outbuf,smb_vwv3,lp_maxmux()); /* maxmux */
	SSVAL(req->outbuf,smb_vwv4,1);
	SSVAL(req->outbuf,smb_vwv5,raw); /* tell redirector we support
		readbraw writebraw (possibly) */
	SIVAL(req->outbuf,smb_vwv6,sys_getpid());
	SSVAL(req->outbuf,smb_vwv10, set_server_zone_offset(t)/60);

	srv_put_dos_date((char *)req->outbuf,smb_vwv8,t);

	return;
}

/****************************************************************************
 Reply for the lanman 2.0 protocol.
****************************************************************************/

static void reply_lanman2(struct smb_request *req, uint16 choice)
{
	int raw = (lp_readraw()?1:0) | (lp_writeraw()?2:0);
	int secword=0;
	time_t t = time(NULL);
	struct smbd_server_connection *sconn = req->sconn;

	sconn->smb1.negprot.encrypted_passwords = lp_encrypted_passwords();
  
	if (lp_security()>=SEC_USER) {
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;
	}
	if (sconn->smb1.negprot.encrypted_passwords) {
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
	}

	reply_outbuf(req, 13, sconn->smb1.negprot.encrypted_passwords?8:0);

	SSVAL(req->outbuf,smb_vwv0,choice);
	SSVAL(req->outbuf,smb_vwv1,secword);
	SIVAL(req->outbuf,smb_vwv6,sys_getpid());

	/* Create a token value and add it to the outgoing packet. */
	if (sconn->smb1.negprot.encrypted_passwords) {
		get_challenge(sconn, (uint8 *)smb_buf(req->outbuf));
		SSVAL(req->outbuf,smb_vwv11, 8);
	}

	set_Protocol(PROTOCOL_LANMAN2);

	/* Reply, SMBlockread, SMBwritelock supported. */
	SCVAL(req->outbuf,smb_flg,FLAG_REPLY|FLAG_SUPPORT_LOCKREAD);
	SSVAL(req->outbuf,smb_vwv2,sconn->smb1.negprot.max_recv);
	SSVAL(req->outbuf,smb_vwv3,lp_maxmux());
	SSVAL(req->outbuf,smb_vwv4,1);
	SSVAL(req->outbuf,smb_vwv5,raw); /* readbraw and/or writebraw */
	SSVAL(req->outbuf,smb_vwv10, set_server_zone_offset(t)/60);
	srv_put_dos_date((char *)req->outbuf,smb_vwv8,t);
}

/****************************************************************************
 Generate the spnego negprot reply blob. Return the number of bytes used.
****************************************************************************/

DATA_BLOB negprot_spnego(TALLOC_CTX *ctx, struct smbd_server_connection *sconn)
{
	DATA_BLOB blob = data_blob_null;
	DATA_BLOB blob_out = data_blob_null;
	nstring dos_name;
	fstring unix_name;
#ifdef DEVELOPER
	size_t slen;
#endif
	const char *OIDs_krb5[] = {OID_KERBEROS5,
				   OID_KERBEROS5_OLD,
				   OID_NTLMSSP,
				   NULL};
	const char *OIDs_ntlm[] = {OID_NTLMSSP, NULL};

	sconn->smb1.negprot.spnego = true;
	/* strangely enough, NT does not sent the single OID NTLMSSP when
	   not a ADS member, it sends no OIDs at all

	   OLD COMMENT : "we can't do this until we teach our sesssion setup parser to know
		   about raw NTLMSSP (clients send no ASN.1 wrapping if we do this)"

	   Our sessionsetup code now handles raw NTLMSSP connects, so we can go
	   back to doing what W2K3 does here. This is needed to make PocketPC 2003
	   CIFS connections work with SPNEGO. See bugzilla bugs #1828 and #3133
	   for details. JRA.

	*/

	if (lp_security() != SEC_ADS && !USE_KERBEROS_KEYTAB) {
#if 0
		/* Code for PocketPC client */
		blob = data_blob(guid, 16);
#else
		/* Code for standalone WXP client */
		blob = spnego_gen_negTokenInit(ctx, OIDs_ntlm, NULL, "NONE");
#endif
	} else if (!lp_send_spnego_principal()) {
		/* By default, Windows 2008 and later sends not_defined_in_RFC4178@please_ignore */
		blob = spnego_gen_negTokenInit(ctx, OIDs_krb5, NULL, ADS_IGNORE_PRINCIPAL);
	} else {
		fstring myname;
		char *host_princ_s = NULL;
		name_to_fqdn(myname, global_myname());
		strlower_m(myname);
		if (asprintf(&host_princ_s, "cifs/%s@%s", myname, lp_realm())
		    == -1) {
			return data_blob_null;
		}
		blob = spnego_gen_negTokenInit(ctx, OIDs_krb5, NULL, host_princ_s);
		SAFE_FREE(host_princ_s);
	}

	blob_out = data_blob_talloc(ctx, NULL, 16 + blob.length);
	if (blob_out.data == NULL) {
		data_blob_free(&blob);
		return data_blob_null;
	}

	memset(blob_out.data, '\0', 16);

	safe_strcpy(unix_name, global_myname(), sizeof(unix_name)-1);
	strlower_m(unix_name);
	push_ascii_nstring(dos_name, unix_name);
	safe_strcpy((char *)blob_out.data, dos_name, 16);

#ifdef DEVELOPER
	/* Fix valgrind 'uninitialized bytes' issue. */
	slen = strlen(dos_name);
	if (slen < 16) {
		memset(blob_out.data+slen, '\0', 16 - slen);
	}
#endif

	memcpy(&blob_out.data[16], blob.data, blob.length);

	data_blob_free(&blob);

	return blob_out;
}

/****************************************************************************
 Reply for the nt protocol.
****************************************************************************/

static void reply_nt1(struct smb_request *req, uint16 choice)
{
	/* dual names + lock_and_read + nt SMBs + remote API calls */
	int capabilities = CAP_NT_FIND|CAP_LOCK_AND_READ|
		CAP_LEVEL_II_OPLOCKS;

	int secword=0;
	bool negotiate_spnego = False;
	struct timespec ts;
	ssize_t ret;
	struct smbd_server_connection *sconn = req->sconn;

	sconn->smb1.negprot.encrypted_passwords = lp_encrypted_passwords();

	/* Check the flags field to see if this is Vista.
	   WinXP sets it and Vista does not. But we have to 
	   distinguish from NT which doesn't set it either. */

	if ( (req->flags2 & FLAGS2_EXTENDED_SECURITY) &&
		((req->flags2 & FLAGS2_UNKNOWN_BIT4) == 0) )
	{
		if (get_remote_arch() != RA_SAMBA) {
			set_remote_arch( RA_VISTA );
		}
	}

	reply_outbuf(req,17,0);

	/* do spnego in user level security if the client
	   supports it and we can do encrypted passwords */
	
	if (sconn->smb1.negprot.encrypted_passwords &&
	    (lp_security() != SEC_SHARE) &&
	    lp_use_spnego() &&
	    (req->flags2 & FLAGS2_EXTENDED_SECURITY)) {
		negotiate_spnego = True;
		capabilities |= CAP_EXTENDED_SECURITY;
		add_to_common_flags2(FLAGS2_EXTENDED_SECURITY);
		/* Ensure FLAGS2_EXTENDED_SECURITY gets set in this reply
		   (already partially constructed. */
		SSVAL(req->outbuf, smb_flg2,
		      req->flags2 | FLAGS2_EXTENDED_SECURITY);
	}
	
	capabilities |= CAP_NT_SMBS|CAP_RPC_REMOTE_APIS|CAP_UNICODE;

	if (lp_unix_extensions()) {
		capabilities |= CAP_UNIX;
	}
	
	if (lp_large_readwrite() && (SMB_OFF_T_BITS == 64))
		capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX|CAP_W2K_SMBS;
	
	if (SMB_OFF_T_BITS == 64)
		capabilities |= CAP_LARGE_FILES;

	if (lp_readraw() && lp_writeraw())
		capabilities |= CAP_RAW_MODE;
	
	if (lp_nt_status_support())
		capabilities |= CAP_STATUS32;
	
	if (lp_host_msdfs())
		capabilities |= CAP_DFS;
	
	if (lp_security() >= SEC_USER) {
		secword |= NEGOTIATE_SECURITY_USER_LEVEL;
	}
	if (sconn->smb1.negprot.encrypted_passwords) {
		secword |= NEGOTIATE_SECURITY_CHALLENGE_RESPONSE;
	}

	if (lp_server_signing()) {
	       	if (lp_security() >= SEC_USER) {
			secword |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED;
			/* No raw mode with smb signing. */
			capabilities &= ~CAP_RAW_MODE;
			if (lp_server_signing() == Required)
				secword |=NEGOTIATE_SECURITY_SIGNATURES_REQUIRED;
			srv_set_signing_negotiated(sconn);
		} else {
			DEBUG(0,("reply_nt1: smb signing is incompatible with share level security !\n"));
			if (lp_server_signing() == Required) {
				exit_server_cleanly("reply_nt1: smb signing required and share level security selected.");
			}
		}
	}

	SSVAL(req->outbuf,smb_vwv0,choice);
	SCVAL(req->outbuf,smb_vwv1,secword);
	
	set_Protocol(PROTOCOL_NT1);
	
	SSVAL(req->outbuf,smb_vwv1+1,lp_maxmux()); /* maxmpx */
	SSVAL(req->outbuf,smb_vwv2+1,1); /* num vcs */
	SIVAL(req->outbuf,smb_vwv3+1,
	      sconn->smb1.negprot.max_recv); /* max buffer. LOTS! */
	SIVAL(req->outbuf,smb_vwv5+1,0x10000); /* raw size. full 64k */
	SIVAL(req->outbuf,smb_vwv7+1,sys_getpid()); /* session key */
	SIVAL(req->outbuf,smb_vwv9+1,capabilities); /* capabilities */
	clock_gettime(CLOCK_REALTIME,&ts);
	put_long_date_timespec(TIMESTAMP_SET_NT_OR_BETTER,(char *)req->outbuf+smb_vwv11+1,ts);
	SSVALS(req->outbuf,smb_vwv15+1,set_server_zone_offset(ts.tv_sec)/60);
	
	if (!negotiate_spnego) {
		/* Create a token value and add it to the outgoing packet. */
		if (sconn->smb1.negprot.encrypted_passwords) {
			uint8 chal[8];
			/* note that we do not send a challenge at all if
			   we are using plaintext */
			get_challenge(sconn, chal);
			ret = message_push_blob(
				&req->outbuf, data_blob_const(chal, sizeof(chal)));
			if (ret == -1) {
				DEBUG(0, ("Could not push challenge\n"));
				reply_nterror(req, NT_STATUS_NO_MEMORY);
				return;
			}
			SCVAL(req->outbuf, smb_vwv16+1, ret);
		}
		ret = message_push_string(&req->outbuf, lp_workgroup(),
					  STR_UNICODE|STR_TERMINATE
					  |STR_NOALIGN);
		if (ret == -1) {
			DEBUG(0, ("Could not push workgroup string\n"));
			reply_nterror(req, NT_STATUS_NO_MEMORY);
			return;
		}
		DEBUG(3,("not using SPNEGO\n"));
	} else {
		DATA_BLOB spnego_blob = negprot_spnego(req, req->sconn);

		if (spnego_blob.data == NULL) {
			reply_nterror(req, NT_STATUS_NO_MEMORY);
			return;
		}

		ret = message_push_blob(&req->outbuf, spnego_blob);
		if (ret == -1) {
			DEBUG(0, ("Could not push spnego blob\n"));
			reply_nterror(req, NT_STATUS_NO_MEMORY);
			return;
		}
		data_blob_free(&spnego_blob);

		SCVAL(req->outbuf,smb_vwv16+1, 0);
		DEBUG(3,("using SPNEGO\n"));
	}

	return;
}

/* these are the protocol lists used for auto architecture detection:

WinNT 3.51:
protocol [PC NETWORK PROGRAM 1.0]
protocol [XENIX CORE]
protocol [MICROSOFT NETWORKS 1.03]
protocol [LANMAN1.0]
protocol [Windows for Workgroups 3.1a]
protocol [LM1.2X002]
protocol [LANMAN2.1]
protocol [NT LM 0.12]

Win95:
protocol [PC NETWORK PROGRAM 1.0]
protocol [XENIX CORE]
protocol [MICROSOFT NETWORKS 1.03]
protocol [LANMAN1.0]
protocol [Windows for Workgroups 3.1a]
protocol [LM1.2X002]
protocol [LANMAN2.1]
protocol [NT LM 0.12]

Win2K:
protocol [PC NETWORK PROGRAM 1.0]
protocol [LANMAN1.0]
protocol [Windows for Workgroups 3.1a]
protocol [LM1.2X002]
protocol [LANMAN2.1]
protocol [NT LM 0.12]

Vista:
protocol [PC NETWORK PROGRAM 1.0]
protocol [LANMAN1.0]
protocol [Windows for Workgroups 3.1a]
protocol [LM1.2X002]
protocol [LANMAN2.1]
protocol [NT LM 0.12]
protocol [SMB 2.001]

OS/2:
protocol [PC NETWORK PROGRAM 1.0]
protocol [XENIX CORE]
protocol [LANMAN1.0]
protocol [LM1.2X002]
protocol [LANMAN2.1]
*/

/*
  * Modified to recognize the architecture of the remote machine better.
  *
  * This appears to be the matrix of which protocol is used by which
  * MS product.
       Protocol                       WfWg    Win95   WinNT  Win2K  OS/2 Vista
       PC NETWORK PROGRAM 1.0          1       1       1      1      1     1
       XENIX CORE                                      2             2
       MICROSOFT NETWORKS 3.0          2       2       
       DOS LM1.2X002                   3       3       
       MICROSOFT NETWORKS 1.03                         3
       DOS LANMAN2.1                   4       4       
       LANMAN1.0                                       4      2      3     2
       Windows for Workgroups 3.1a     5       5       5      3            3
       LM1.2X002                                       6      4      4     4
       LANMAN2.1                                       7      5      5     5
       NT LM 0.12                              6       8      6            6
       SMB 2.001                                                           7
  *
  *  tim@fsg.com 09/29/95
  *  Win2K added by matty 17/7/99
  */
  
#define ARCH_WFWG     0x3      /* This is a fudge because WfWg is like Win95 */
#define ARCH_WIN95    0x2
#define ARCH_WINNT    0x4
#define ARCH_WIN2K    0xC      /* Win2K is like NT */
#define ARCH_OS2      0x14     /* Again OS/2 is like NT */
#define ARCH_SAMBA    0x20
#define ARCH_CIFSFS   0x40
#define ARCH_VISTA    0x8C     /* Vista is like XP/2K */
 
#define ARCH_ALL      0x7F
 
/* List of supported protocols, most desired first */
static const struct {
	const char *proto_name;
	const char *short_name;
	void (*proto_reply_fn)(struct smb_request *req, uint16 choice);
	int protocol_level;
} supported_protocols[] = {
	{"SMB 2.002",               "SMB2",     reply_smb2002,  PROTOCOL_SMB2},
	{"NT LANMAN 1.0",           "NT1",      reply_nt1,      PROTOCOL_NT1},
	{"NT LM 0.12",              "NT1",      reply_nt1,      PROTOCOL_NT1},
	{"POSIX 2",                 "NT1",      reply_nt1,      PROTOCOL_NT1},
	{"LANMAN2.1",               "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"LM1.2X002",               "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"Samba",                   "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"DOS LM1.2X002",           "LANMAN2",  reply_lanman2,  PROTOCOL_LANMAN2},
	{"LANMAN1.0",               "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
	{"MICROSOFT NETWORKS 3.0",  "LANMAN1",  reply_lanman1,  PROTOCOL_LANMAN1},
	{"MICROSOFT NETWORKS 1.03", "COREPLUS", reply_coreplus, PROTOCOL_COREPLUS},
	{"PC NETWORK PROGRAM 1.0",  "CORE",     reply_corep,    PROTOCOL_CORE}, 
	{NULL,NULL,NULL,0},
};

/****************************************************************************
 Reply to a negprot.
 conn POINTER CAN BE NULL HERE !
****************************************************************************/

void reply_negprot(struct smb_request *req)
{
	int choice= -1;
	int protocol;
	const char *p;
	int arch = ARCH_ALL;
	int num_cliprotos;
	char **cliprotos;
	int i;
	size_t converted_size;
	struct smbd_server_connection *sconn = req->sconn;

	START_PROFILE(SMBnegprot);

	if (sconn->smb1.negprot.done) {
		END_PROFILE(SMBnegprot);
		exit_server_cleanly("multiple negprot's are not permitted");
	}
	sconn->smb1.negprot.done = true;

	if (req->buflen == 0) {
		DEBUG(0, ("negprot got no protocols\n"));
		reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
		END_PROFILE(SMBnegprot);
		return;
	}

	if (req->buf[req->buflen-1] != '\0') {
		DEBUG(0, ("negprot protocols not 0-terminated\n"));
		reply_nterror(req, NT_STATUS_INVALID_PARAMETER);
		END_PROFILE(SMBnegprot);
		return;
	}

	p = (const char *)req->buf + 1;

	num_cliprotos = 0;
	cliprotos = NULL;

	while (smbreq_bufrem(req, p) > 0) {

		char **tmp;

		tmp = TALLOC_REALLOC_ARRAY(talloc_tos(), cliprotos, char *,
					   num_cliprotos+1);
		if (tmp == NULL) {
			DEBUG(0, ("talloc failed\n"));
			TALLOC_FREE(cliprotos);
			reply_nterror(req, NT_STATUS_NO_MEMORY);
			END_PROFILE(SMBnegprot);
			return;
		}

		cliprotos = tmp;

		if (!pull_ascii_talloc(cliprotos, &cliprotos[num_cliprotos], p,
				       &converted_size)) {
			DEBUG(0, ("pull_ascii_talloc failed\n"));
			TALLOC_FREE(cliprotos);
			reply_nterror(req, NT_STATUS_NO_MEMORY);
			END_PROFILE(SMBnegprot);
			return;
		}

		DEBUG(3, ("Requested protocol [%s]\n",
			  cliprotos[num_cliprotos]));

		num_cliprotos += 1;
		p += strlen(p) + 2;
	}

	for (i=0; i<num_cliprotos; i++) {
		if (strcsequal(cliprotos[i], "Windows for Workgroups 3.1a"))
			arch &= ( ARCH_WFWG | ARCH_WIN95 | ARCH_WINNT
				  | ARCH_WIN2K );
		else if (strcsequal(cliprotos[i], "DOS LM1.2X002"))
			arch &= ( ARCH_WFWG | ARCH_WIN95 );
		else if (strcsequal(cliprotos[i], "DOS LANMAN2.1"))
			arch &= ( ARCH_WFWG | ARCH_WIN95 );
		else if (strcsequal(cliprotos[i], "NT LM 0.12"))
			arch &= ( ARCH_WIN95 | ARCH_WINNT | ARCH_WIN2K
				  | ARCH_CIFSFS);
		else if (strcsequal(cliprotos[i], "SMB 2.001"))
			arch = ARCH_VISTA;		
		else if (strcsequal(cliprotos[i], "LANMAN2.1"))
			arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 );
		else if (strcsequal(cliprotos[i], "LM1.2X002"))
			arch &= ( ARCH_WINNT | ARCH_WIN2K | ARCH_OS2 );
		else if (strcsequal(cliprotos[i], "MICROSOFT NETWORKS 1.03"))
			arch &= ARCH_WINNT;
		else if (strcsequal(cliprotos[i], "XENIX CORE"))
			arch &= ( ARCH_WINNT | ARCH_OS2 );
		else if (strcsequal(cliprotos[i], "Samba")) {
			arch = ARCH_SAMBA;
			break;
		} else if (strcsequal(cliprotos[i], "POSIX 2")) {
			arch = ARCH_CIFSFS;
			break;
		}
	}

	/* CIFSFS can send one arch only, NT LM 0.12. */
	if (i == 1 && (arch & ARCH_CIFSFS)) {
		arch = ARCH_CIFSFS;
	}

	switch ( arch ) {
		case ARCH_CIFSFS:
			set_remote_arch(RA_CIFSFS);
			break;
		case ARCH_SAMBA:
			set_remote_arch(RA_SAMBA);
			break;
		case ARCH_WFWG:
			set_remote_arch(RA_WFWG);
			break;
		case ARCH_WIN95:
			set_remote_arch(RA_WIN95);
			break;
		case ARCH_WINNT:
			if(req->flags2 == FLAGS2_WIN2K_SIGNATURE)
				set_remote_arch(RA_WIN2K);
			else
				set_remote_arch(RA_WINNT);
			break;
		case ARCH_WIN2K:
			/* Vista may have been set in the negprot so don't 
			   override it here */
			if ( get_remote_arch() != RA_VISTA )
				set_remote_arch(RA_WIN2K);
			break;
		case ARCH_VISTA:
			set_remote_arch(RA_VISTA);
			break;
		case ARCH_OS2:
			set_remote_arch(RA_OS2);
			break;
		default:
			set_remote_arch(RA_UNKNOWN);
		break;
	}
 
	/* possibly reload - change of architecture */
	reload_services(sconn->msg_ctx, sconn->sock, True);
	
	/* moved from the netbios session setup code since we don't have that 
	   when the client connects to port 445.  Of course there is a small
	   window where we are listening to messages   -- jerry */

	serverid_register(sconn_server_id(sconn),
			  FLAG_MSG_GENERAL|FLAG_MSG_SMBD
			  |FLAG_MSG_PRINT_GENERAL);
    
	/* Check for protocols, most desirable first */
	for (protocol = 0; supported_protocols[protocol].proto_name; protocol++) {
		i = 0;
		if ((supported_protocols[protocol].protocol_level <= lp_maxprotocol()) &&
				(supported_protocols[protocol].protocol_level >= lp_minprotocol()))
			while (i < num_cliprotos) {
				if (strequal(cliprotos[i],supported_protocols[protocol].proto_name))
					choice = i;
				i++;
			}
		if(choice != -1)
			break;
	}
  
	if(choice != -1) {
		fstrcpy(remote_proto,supported_protocols[protocol].short_name);
		reload_services(sconn->msg_ctx, sconn->sock, True);
		supported_protocols[protocol].proto_reply_fn(req, choice);
		DEBUG(3,("Selected protocol %s\n",supported_protocols[protocol].proto_name));
	} else {
		DEBUG(0,("No protocol supported !\n"));
		reply_outbuf(req, 1, 0);
		SSVAL(req->outbuf, smb_vwv0, choice);
	}
  
	DEBUG( 5, ( "negprot index=%d\n", choice ) );

	if ((lp_server_signing() == Required) && (get_Protocol() < PROTOCOL_NT1)) {
		exit_server_cleanly("SMB signing is required and "
			"client negotiated a downlevel protocol");
	}

	TALLOC_FREE(cliprotos);
	END_PROFILE(SMBnegprot);
	return;
}