summaryrefslogtreecommitdiff
path: root/source4/libcli/raw/clisession.c
blob: 264c1cd616f9173893fa63cf4f4a7371f346a762 (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
/* 
   Unix SMB/CIFS implementation.
   SMB client session context management functions
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) James Myers 2003 <myersjj@samba.org>
   
   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"

#define SETUP_REQUEST_SESSION(cmd, wct, buflen) do { \
	req = smbcli_request_setup_session(session, cmd, wct, buflen); \
	if (!req) return NULL; \
} while (0)

/****************************************************************************
 Initialize the session context
****************************************************************************/
struct smbcli_session *smbcli_session_init(struct smbcli_transport *transport)
{
	struct smbcli_session *session;

	session = talloc_named(NULL, sizeof(*session), "smbcli_session");
	if (!session) {
		return NULL;
	}

	ZERO_STRUCTP(session);
	session->transport = transport;
	session->pid = (uint16_t)getpid();
	session->vuid = UID_FIELD_INVALID;
	session->transport->reference_count++;

	return session;
}

/****************************************************************************
reduce reference_count and destroy is <= 0
****************************************************************************/
void smbcli_session_close(struct smbcli_session *session)
{
	session->reference_count--;
	if (session->reference_count <= 0) {
		smbcli_transport_close(session->transport);
		talloc_free(session);
	}
}

/****************************************************************************
 Perform a session setup (async send)
****************************************************************************/
struct smbcli_request *smb_raw_session_setup_send(struct smbcli_session *session, union smb_sesssetup *parms) 
{
	struct smbcli_request *req = NULL;

	switch (parms->generic.level) {
	case RAW_SESSSETUP_GENERIC:
		/* handled elsewhere */
		return NULL;

	case RAW_SESSSETUP_OLD:
		SETUP_REQUEST_SESSION(SMBsesssetupX, 10, 0);
		SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
		SSVAL(req->out.vwv, VWV(1), 0);
		SSVAL(req->out.vwv,VWV(2),parms->old.in.bufsize);
		SSVAL(req->out.vwv,VWV(3),parms->old.in.mpx_max);
		SSVAL(req->out.vwv,VWV(4),parms->old.in.vc_num);
		SIVAL(req->out.vwv,VWV(5),parms->old.in.sesskey);
		SSVAL(req->out.vwv,VWV(7),parms->old.in.password.length);
		SIVAL(req->out.vwv,VWV(8), 0); /* reserved */
		smbcli_req_append_blob(req, &parms->old.in.password);
		smbcli_req_append_string(req, parms->old.in.user, STR_TERMINATE);
		smbcli_req_append_string(req, parms->old.in.domain, STR_TERMINATE|STR_UPPER);
		smbcli_req_append_string(req, parms->old.in.os, STR_TERMINATE);
		smbcli_req_append_string(req, parms->old.in.lanman, STR_TERMINATE);
		break;

	case RAW_SESSSETUP_NT1:
		SETUP_REQUEST_SESSION(SMBsesssetupX, 13, 0);
		SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
		SSVAL(req->out.vwv, VWV(1), 0);
		SSVAL(req->out.vwv, VWV(2), parms->nt1.in.bufsize);
		SSVAL(req->out.vwv, VWV(3), parms->nt1.in.mpx_max);
		SSVAL(req->out.vwv, VWV(4), parms->nt1.in.vc_num);
		SIVAL(req->out.vwv, VWV(5), parms->nt1.in.sesskey);
		SSVAL(req->out.vwv, VWV(7), parms->nt1.in.password1.length);
		SSVAL(req->out.vwv, VWV(8), parms->nt1.in.password2.length);
		SIVAL(req->out.vwv, VWV(9), 0); /* reserved */
		SIVAL(req->out.vwv, VWV(11), parms->nt1.in.capabilities);
		smbcli_req_append_blob(req, &parms->nt1.in.password1);
		smbcli_req_append_blob(req, &parms->nt1.in.password2);
		smbcli_req_append_string(req, parms->nt1.in.user, STR_TERMINATE);
		smbcli_req_append_string(req, parms->nt1.in.domain, STR_TERMINATE|STR_UPPER);
		smbcli_req_append_string(req, parms->nt1.in.os, STR_TERMINATE);
		smbcli_req_append_string(req, parms->nt1.in.lanman, STR_TERMINATE);
		break;

	case RAW_SESSSETUP_SPNEGO:
		SETUP_REQUEST_SESSION(SMBsesssetupX, 12, 0);
		SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
		SSVAL(req->out.vwv, VWV(1), 0);
		SSVAL(req->out.vwv, VWV(2), parms->spnego.in.bufsize);
		SSVAL(req->out.vwv, VWV(3), parms->spnego.in.mpx_max);
		SSVAL(req->out.vwv, VWV(4), parms->spnego.in.vc_num);
		SIVAL(req->out.vwv, VWV(5), parms->spnego.in.sesskey);
		SSVAL(req->out.vwv, VWV(7), parms->spnego.in.secblob.length);
		SIVAL(req->out.vwv, VWV(8), 0); /* reserved */
		SIVAL(req->out.vwv, VWV(10), parms->spnego.in.capabilities);
		smbcli_req_append_blob(req, &parms->spnego.in.secblob);
		smbcli_req_append_string(req, parms->spnego.in.os, STR_TERMINATE);
		smbcli_req_append_string(req, parms->spnego.in.lanman, STR_TERMINATE);
		smbcli_req_append_string(req, parms->spnego.in.domain, STR_TERMINATE);
		break;
	}

	if (!smbcli_request_send(req)) {
		smbcli_request_destroy(req);
		return NULL;
	}

	return req;
}


/****************************************************************************
 Perform a session setup (async recv)
****************************************************************************/
NTSTATUS smb_raw_session_setup_recv(struct smbcli_request *req, 
				    TALLOC_CTX *mem_ctx, 
				    union smb_sesssetup *parms) 
{
	uint16_t len;
	char *p;

	if (!smbcli_request_receive(req)) {
		return smbcli_request_destroy(req);
	}
	
	if (!NT_STATUS_IS_OK(req->status) &&
	    !NT_STATUS_EQUAL(req->status,NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		return smbcli_request_destroy(req);
	}

	switch (parms->generic.level) {
	case RAW_SESSSETUP_GENERIC:
		/* handled elsewhere */
		return NT_STATUS_INVALID_LEVEL;

	case RAW_SESSSETUP_OLD:
		SMBCLI_CHECK_WCT(req, 3);
		ZERO_STRUCT(parms->old.out);
		parms->old.out.vuid = SVAL(req->in.hdr, HDR_UID);
		parms->old.out.action = SVAL(req->in.vwv, VWV(2));
		p = req->in.data;
		if (p) {
			p += smbcli_req_pull_string(req, mem_ctx, &parms->old.out.os, p, -1, STR_TERMINATE);
			p += smbcli_req_pull_string(req, mem_ctx, &parms->old.out.lanman, p, -1, STR_TERMINATE);
			p += smbcli_req_pull_string(req, mem_ctx, &parms->old.out.domain, p, -1, STR_TERMINATE);
		}
		break;

	case RAW_SESSSETUP_NT1:
		SMBCLI_CHECK_WCT(req, 3);
		ZERO_STRUCT(parms->nt1.out);
		parms->nt1.out.vuid   = SVAL(req->in.hdr, HDR_UID);
		parms->nt1.out.action = SVAL(req->in.vwv, VWV(2));
		p = req->in.data;
		if (p) {
			p += smbcli_req_pull_string(req, mem_ctx, &parms->nt1.out.os, p, -1, STR_TERMINATE);
			p += smbcli_req_pull_string(req, mem_ctx, &parms->nt1.out.lanman, p, -1, STR_TERMINATE);
			if (p < (req->in.data + req->in.data_size)) {
				p += smbcli_req_pull_string(req, mem_ctx, &parms->nt1.out.domain, p, -1, STR_TERMINATE);
			}
		}
		break;

	case RAW_SESSSETUP_SPNEGO:
		SMBCLI_CHECK_WCT(req, 4);
		ZERO_STRUCT(parms->spnego.out);
		parms->spnego.out.vuid   = SVAL(req->in.hdr, HDR_UID);
		parms->spnego.out.action = SVAL(req->in.vwv, VWV(2));
		len                      = SVAL(req->in.vwv, VWV(3));
		p = req->in.data;
		if (!p) {
			break;
		}

		parms->spnego.out.secblob = smbcli_req_pull_blob(req, mem_ctx, p, len);
		p += parms->spnego.out.secblob.length;
		p += smbcli_req_pull_string(req, mem_ctx, &parms->spnego.out.os, p, -1, STR_TERMINATE);
		p += smbcli_req_pull_string(req, mem_ctx, &parms->spnego.out.lanman, p, -1, STR_TERMINATE);
		p += smbcli_req_pull_string(req, mem_ctx, &parms->spnego.out.domain, p, -1, STR_TERMINATE);
		break;
	}

failed:
	return smbcli_request_destroy(req);
}

/*
  form an encrypted lanman password from a plaintext password
  and the server supplied challenge
*/
static DATA_BLOB lanman_blob(const char *pass, DATA_BLOB challenge)
{
	DATA_BLOB blob = data_blob(NULL, 24);
	SMBencrypt(pass, challenge.data, blob.data);
	return blob;
}

/*
  form an encrypted NT password from a plaintext password
  and the server supplied challenge
*/
static DATA_BLOB nt_blob(const char *pass, DATA_BLOB challenge)
{
	DATA_BLOB blob = data_blob(NULL, 24);
	SMBNTencrypt(pass, challenge.data, blob.data);
	return blob;
}

/*
  store the user session key for a transport
*/
void smbcli_session_set_user_session_key(struct smbcli_session *session,
				   const DATA_BLOB *session_key)
{
	session->user_session_key = data_blob_talloc(session, 
						     session_key->data, 
						     session_key->length);
}

/*
  setup signing for a NT1 style session setup
*/
static void use_nt1_session_keys(struct smbcli_session *session, 
				 const char *password, const DATA_BLOB  *nt_response)
{
	struct smbcli_transport *transport = session->transport; 
	uint8_t nt_hash[16];
	DATA_BLOB session_key = data_blob(NULL, 16);

	E_md4hash(password, nt_hash);
	SMBsesskeygen_ntv1(nt_hash, session_key.data);

	smbcli_transport_simple_set_signing(transport, session_key, *nt_response);

	smbcli_session_set_user_session_key(session, &session_key);
	data_blob_free(&session_key);
}

/****************************************************************************
 Perform a session setup (sync interface) using generic interface and the old
 style sesssetup call
****************************************************************************/
static NTSTATUS smb_raw_session_setup_generic_old(struct smbcli_session *session, 
						  TALLOC_CTX *mem_ctx, 
						  union smb_sesssetup *parms) 
{
	NTSTATUS status;
	union smb_sesssetup s2;

	/* use the old interface */
	s2.generic.level = RAW_SESSSETUP_OLD;
	s2.old.in.bufsize = ~0;
	s2.old.in.mpx_max = 50;
	s2.old.in.vc_num = 1;
	s2.old.in.sesskey = parms->generic.in.sesskey;
	s2.old.in.domain = parms->generic.in.domain;
	s2.old.in.user = parms->generic.in.user;
	s2.old.in.os = "Unix";
	s2.old.in.lanman = "Samba";
	
	if (!parms->generic.in.password) {
		s2.old.in.password = data_blob(NULL, 0);
	} else if (session->transport->negotiate.sec_mode & 
		   NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
		s2.old.in.password = lanman_blob(parms->generic.in.password, 
						 session->transport->negotiate.secblob);
	} else {
		s2.old.in.password = data_blob(parms->generic.in.password, 
					       strlen(parms->generic.in.password));
	}
	
	status = smb_raw_session_setup(session, mem_ctx, &s2);
	
	data_blob_free(&s2.old.in.password);
	
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	
	parms->generic.out.vuid = s2.old.out.vuid;
	parms->generic.out.os = s2.old.out.os;
	parms->generic.out.lanman = s2.old.out.lanman;
	parms->generic.out.domain = s2.old.out.domain;
	
	return NT_STATUS_OK;
}

/****************************************************************************
 Perform a session setup (sync interface) using generic interface and the NT1
 style sesssetup call
****************************************************************************/
static NTSTATUS smb_raw_session_setup_generic_nt1(struct smbcli_session *session, 
						  TALLOC_CTX *mem_ctx,
						  union smb_sesssetup *parms) 
{
	NTSTATUS status;
	union smb_sesssetup s2;

	s2.generic.level = RAW_SESSSETUP_NT1;
	s2.nt1.in.bufsize = ~0;
	s2.nt1.in.mpx_max = 50;
	s2.nt1.in.vc_num = 1;
	s2.nt1.in.sesskey = parms->generic.in.sesskey;
	s2.nt1.in.capabilities = parms->generic.in.capabilities;
	s2.nt1.in.domain = parms->generic.in.domain;
	s2.nt1.in.user = parms->generic.in.user;
	s2.nt1.in.os = "Unix";
	s2.nt1.in.lanman = "Samba";

	if (!parms->generic.in.password) {
		s2.nt1.in.password1 = data_blob(NULL, 0);
		s2.nt1.in.password2 = data_blob(NULL, 0);
	} else if (session->transport->negotiate.sec_mode & 
		   NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
		s2.nt1.in.password1 = lanman_blob(parms->generic.in.password, 
						  session->transport->negotiate.secblob);
		s2.nt1.in.password2 = nt_blob(parms->generic.in.password, 
					      session->transport->negotiate.secblob);
		use_nt1_session_keys(session, parms->generic.in.password, &s2.nt1.in.password2);

	} else {
		s2.nt1.in.password1 = data_blob(parms->generic.in.password, 
						strlen(parms->generic.in.password));
		s2.nt1.in.password2 = data_blob(NULL, 0);
	}

	status = smb_raw_session_setup(session, mem_ctx, &s2);
		
	data_blob_free(&s2.nt1.in.password1);
	data_blob_free(&s2.nt1.in.password2);
		
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	parms->generic.out.vuid = s2.nt1.out.vuid;
	parms->generic.out.os = s2.nt1.out.os;
	parms->generic.out.lanman = s2.nt1.out.lanman;
	parms->generic.out.domain = s2.nt1.out.domain;

	return NT_STATUS_OK;
}

/****************************************************************************
 Perform a session setup (sync interface) using generic interface and the SPNEGO
 style sesssetup call
****************************************************************************/
static NTSTATUS smb_raw_session_setup_generic_spnego(struct smbcli_session *session, 
						  TALLOC_CTX *mem_ctx,
						  union smb_sesssetup *parms) 
{
	NTSTATUS status;
	NTSTATUS session_key_err = NT_STATUS_NO_USER_SESSION_KEY;
	union smb_sesssetup s2;
	DATA_BLOB session_key = data_blob(NULL, 0);
	DATA_BLOB null_data_blob = data_blob(NULL, 0);
	const char *chosen_oid;

	s2.generic.level = RAW_SESSSETUP_SPNEGO;
	s2.spnego.in.bufsize = ~0;
	s2.spnego.in.mpx_max = 50;
	s2.spnego.in.vc_num = 1;
	s2.spnego.in.sesskey = parms->generic.in.sesskey;
	s2.spnego.in.capabilities = parms->generic.in.capabilities;
	s2.spnego.in.domain = parms->generic.in.domain;
	s2.spnego.in.os = "Unix";
	s2.spnego.in.lanman = "Samba";
	s2.spnego.out.vuid = session->vuid;

	smbcli_temp_set_signing(session->transport);

	status = gensec_client_start(&session->gensec);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start GENSEC client mode: %s\n", nt_errstr(status)));
		goto done;
	}

	gensec_want_feature(session->gensec, GENSEC_WANT_SESSION_KEY);

	status = gensec_set_domain(session->gensec, parms->generic.in.domain);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start set GENSEC client domain to %s: %s\n", 
			  parms->generic.in.domain, nt_errstr(status)));
		goto done;
	}

	status = gensec_set_username(session->gensec, parms->generic.in.user);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start set GENSEC client username to %s: %s\n", 
			  parms->generic.in.user, nt_errstr(status)));
		goto done;
	}

	status = gensec_set_password(session->gensec, parms->generic.in.password);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start set GENSEC client password: %s\n", 
			  nt_errstr(status)));
		goto done;
	}

	status = gensec_set_target_hostname(session->gensec, session->transport->socket->hostname);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start set GENSEC target hostname: %s\n", 
			  nt_errstr(status)));
		goto done;
	}

	if (session->transport->negotiate.secblob.length) {
		chosen_oid = OID_SPNEGO;
	} else {
		/* without a sec blob, means raw NTLMSSP */
		chosen_oid = OID_NTLMSSP;
	}

	status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("Failed to start set GENSEC client SPNEGO mechanism %s: %s\n",
			  gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
		goto done;
	}
	
	status = gensec_update(session->gensec, mem_ctx,
			       session->transport->negotiate.secblob,
			       &s2.spnego.in.secblob);

	while(1) {
		if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
			break;
		}

		if (!NT_STATUS_IS_OK(session_key_err)) {
			session_key_err = gensec_session_key(session->gensec, &session_key);
		}
		if (NT_STATUS_IS_OK(session_key_err)) {
			smbcli_transport_simple_set_signing(session->transport, session_key, null_data_blob);
		}
		
		if (NT_STATUS_IS_OK(status) && s2.spnego.in.secblob.length == 0) {
			break;
		}

		session->vuid = s2.spnego.out.vuid;
		status = smb_raw_session_setup(session, mem_ctx, &s2);
		session->vuid = UID_FIELD_INVALID;
		if (!NT_STATUS_IS_OK(status) &&
		    !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
			break;
		}

		status = gensec_update(session->gensec, mem_ctx,
				       s2.spnego.out.secblob,
				       &s2.spnego.in.secblob);

	}

done:
	if (NT_STATUS_IS_OK(status)) {
		if (!NT_STATUS_IS_OK(session_key_err)) {
			DEBUG(1, ("Failed to get user session key: %s\n", nt_errstr(session_key_err)));
			return session_key_err;
		}

		smbcli_session_set_user_session_key(session, &session_key);

		parms->generic.out.vuid = s2.spnego.out.vuid;
		parms->generic.out.os = s2.spnego.out.os;
		parms->generic.out.lanman = s2.spnego.out.lanman;
		parms->generic.out.domain = s2.spnego.out.domain;
	} else {
		gensec_end(&session->gensec);
		DEBUG(1, ("Failed to login with %s: %s\n", gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
		return status;
	}

	return status;
}

/****************************************************************************
 Perform a session setup (sync interface) using generic interface
****************************************************************************/
static NTSTATUS smb_raw_session_setup_generic(struct smbcli_session *session, 
					      TALLOC_CTX *mem_ctx,
					      union smb_sesssetup *parms) 
{
	if (session->transport->negotiate.protocol < PROTOCOL_LANMAN1) {
		/* no session setup at all in earliest protocols */
		ZERO_STRUCT(parms->generic.out);
		return NT_STATUS_OK;
	}

	/* see if we need to use the original session setup interface */
	if (session->transport->negotiate.protocol < PROTOCOL_NT1) {
		return smb_raw_session_setup_generic_old(session, mem_ctx, parms);
	}

	/* see if we should use the NT1 interface */
	if (!session->transport->options.use_spnego ||
	    !(parms->generic.in.capabilities & CAP_EXTENDED_SECURITY)) {
		return smb_raw_session_setup_generic_nt1(session, mem_ctx, parms);
	}

	/* default to using SPNEGO/NTLMSSP */
	return smb_raw_session_setup_generic_spnego(session, mem_ctx, parms);
}


/****************************************************************************
 Perform a session setup (sync interface)
this interface allows for RAW_SESSSETUP_GENERIC to auto-select session
setup variant based on negotiated protocol options
****************************************************************************/
NTSTATUS smb_raw_session_setup(struct smbcli_session *session, TALLOC_CTX *mem_ctx, 
			       union smb_sesssetup *parms) 
{
	struct smbcli_request *req;

	if (parms->generic.level == RAW_SESSSETUP_GENERIC) {
		NTSTATUS ret = smb_raw_session_setup_generic(session, mem_ctx, parms);

		if (NT_STATUS_IS_OK(ret) 
		    && parms->generic.in.user 
		    && *parms->generic.in.user) {
			if (!session->transport->negotiate.sign_info.doing_signing 
			    && session->transport->negotiate.sign_info.mandatory_signing) {
				DEBUG(0, ("SMB signing required, but server does not support it\n"));
				return NT_STATUS_ACCESS_DENIED;
			}
		}
		return ret;
	}

	req = smb_raw_session_setup_send(session, parms);
	return smb_raw_session_setup_recv(req, mem_ctx, parms);
}


/****************************************************************************
 Send a uloggoff (async send)
*****************************************************************************/
struct smbcli_request *smb_raw_ulogoff_send(struct smbcli_session *session)
{
	struct smbcli_request *req;

	SETUP_REQUEST_SESSION(SMBulogoffX, 2, 0);

	SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
	SSVAL(req->out.vwv, VWV(1), 0);

	if (!smbcli_request_send(req)) {
		smbcli_request_destroy(req);
		return NULL;
	}

	return req;
}

/****************************************************************************
 Send a uloggoff (sync interface)
*****************************************************************************/
NTSTATUS smb_raw_ulogoff(struct smbcli_session *session)
{
	struct smbcli_request *req = smb_raw_ulogoff_send(session);
	return smbcli_request_simple_recv(req);
}


/****************************************************************************
 Send a SMBexit
****************************************************************************/
NTSTATUS smb_raw_exit(struct smbcli_session *session)
{
	struct smbcli_request *req;

	req = smbcli_request_setup_session(session, SMBexit, 0, 0);

	if (smbcli_request_send(req)) {
		smbcli_request_receive(req);
	}
	return smbcli_request_destroy(req);
}