summaryrefslogtreecommitdiff
path: root/source3/libsmb/ntlmssp.c
blob: e0bcccaee63ec2eb70003f64cf8a1f1f2f44e347 (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
/*
   Unix SMB/Netbios implementation.
   Version 3.0
   handle NLTMSSP, server side

   Copyright (C) Andrew Tridgell      2001
   Copyright (C) Andrew Bartlett 2001-2010
   Copyright (C) Stefan Metzmacher 2005

   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 "../libcli/auth/ntlmssp.h"
#include "../libcli/auth/ntlmssp_private.h"
#include "../libcli/auth/libcli_auth.h"
#include "../librpc/gen_ndr/ndr_ntlmssp.h"
#include "../libcli/auth/ntlmssp_ndr.h"
#include "../lib/crypto/md5.h"
#include "../lib/crypto/arcfour.h"
#include "../lib/crypto/hmacmd5.h"

static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
				       TALLOC_CTX *out_mem_ctx, /* Unused at this time */
				       DATA_BLOB reply, DATA_BLOB *next_request);
static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
				         TALLOC_CTX *out_mem_ctx, /* Unused at this time */
					 const DATA_BLOB reply, DATA_BLOB *next_request);
/**
 * Callbacks for NTLMSSP - for both client and server operating modes
 *
 */

static const struct ntlmssp_callbacks {
	enum ntlmssp_role role;
	enum ntlmssp_message_type ntlmssp_command;
	NTSTATUS (*fn)(struct ntlmssp_state *ntlmssp_state,
		       TALLOC_CTX *out_mem_ctx,
		       DATA_BLOB in, DATA_BLOB *out);
} ntlmssp_callbacks[] = {
	{NTLMSSP_CLIENT, NTLMSSP_INITIAL, ntlmssp_client_initial},
	{NTLMSSP_SERVER, NTLMSSP_NEGOTIATE, ntlmssp_server_negotiate},
	{NTLMSSP_CLIENT, NTLMSSP_CHALLENGE, ntlmssp_client_challenge},
	{NTLMSSP_SERVER, NTLMSSP_AUTH, ntlmssp_server_auth},
	{NTLMSSP_CLIENT, NTLMSSP_UNKNOWN, NULL},
	{NTLMSSP_SERVER, NTLMSSP_UNKNOWN, NULL}
};


/**
 * Default challenge generation code.
 *
 */

static NTSTATUS get_challenge(const struct ntlmssp_state *ntlmssp_state,
			      uint8_t chal[8])
{
	generate_random_buffer(chal, 8);
	return NT_STATUS_OK;
}

/**
 * Default 'we can set the challenge to anything we like' implementation
 *
 */

static bool may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
{
	return True;
}

/**
 * Default 'we can set the challenge to anything we like' implementation
 *
 * Does not actually do anything, as the value is always in the structure anyway.
 *
 */

static NTSTATUS set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
{
	SMB_ASSERT(challenge->length == 8);
	return NT_STATUS_OK;
}

/**
 * Set a username on an NTLMSSP context - ensures it is talloc()ed
 *
 */

NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
{
	ntlmssp_state->user = talloc_strdup(ntlmssp_state, user ? user : "" );
	if (!ntlmssp_state->user) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/**
 * Store NT and LM hashes on an NTLMSSP context - ensures they are talloc()ed
 *
 */
NTSTATUS ntlmssp_set_hashes(struct ntlmssp_state *ntlmssp_state,
			    const uint8_t lm_hash[16],
			    const uint8_t nt_hash[16])
{
	ntlmssp_state->lm_hash = (uint8_t *)
		TALLOC_MEMDUP(ntlmssp_state, lm_hash, 16);
	ntlmssp_state->nt_hash = (uint8_t *)
		TALLOC_MEMDUP(ntlmssp_state, nt_hash, 16);
	if (!ntlmssp_state->lm_hash || !ntlmssp_state->nt_hash) {
		TALLOC_FREE(ntlmssp_state->lm_hash);
		TALLOC_FREE(ntlmssp_state->nt_hash);
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/**
 * Converts a password to the hashes on an NTLMSSP context.
 *
 */
NTSTATUS ntlmssp_set_password(struct ntlmssp_state *ntlmssp_state, const char *password)
{
	if (!password) {
		ntlmssp_state->lm_hash = NULL;
		ntlmssp_state->nt_hash = NULL;
	} else {
		uint8_t lm_hash[16];
		uint8_t nt_hash[16];

		E_deshash(password, lm_hash);
		E_md4hash(password, nt_hash);
		return ntlmssp_set_hashes(ntlmssp_state, lm_hash, nt_hash);
	}
	return NT_STATUS_OK;
}

/**
 * Set a domain on an NTLMSSP context - ensures it is talloc()ed
 *
 */
NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
{
	ntlmssp_state->domain = talloc_strdup(ntlmssp_state,
					      domain ? domain : "" );
	if (!ntlmssp_state->domain) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

/**
 * Request features for the NTLMSSP negotiation
 *
 * @param ntlmssp_state NTLMSSP state
 * @param feature_list List of space seperated features requested from NTLMSSP.
 */
void ntlmssp_want_feature_list(struct ntlmssp_state *ntlmssp_state, char *feature_list)
{
	/*
	 * We need to set this to allow a later SetPassword
	 * via the SAMR pipe to succeed. Strange.... We could
	 * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
	 */
	if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if(in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
	}
	if (in_list("NTLMSSP_FEATURE_CCACHE", feature_list, true)) {
		ntlmssp_state->use_ccache = true;
	}
}

/**
 * Request a feature for the NTLMSSP negotiation
 *
 * @param ntlmssp_state NTLMSSP state
 * @param feature Bit flag specifying the requested feature
 */
void ntlmssp_want_feature(struct ntlmssp_state *ntlmssp_state, uint32_t feature)
{
	/* As per JRA's comment above */
	if (feature & NTLMSSP_FEATURE_SESSION_KEY) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if (feature & NTLMSSP_FEATURE_SIGN) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if (feature & NTLMSSP_FEATURE_SEAL) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
	}
	if (feature & NTLMSSP_FEATURE_CCACHE) {
		ntlmssp_state->use_ccache = true;
	}
}

/**
 * Next state function for the NTLMSSP state machine
 *
 * @param ntlmssp_state NTLMSSP State
 * @param in The packet in from the NTLMSSP partner, as a DATA_BLOB
 * @param out The reply, as an allocated DATA_BLOB, caller to free.
 * @return Errors, NT_STATUS_MORE_PROCESSING_REQUIRED or NT_STATUS_OK.
 */

NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
			const DATA_BLOB input, DATA_BLOB *out)
{
	uint32_t ntlmssp_command;
	int i;

	if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
		/* Called update after negotiations finished. */
		DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	*out = data_blob_null;

	if (!input.length) {
		switch (ntlmssp_state->role) {
		case NTLMSSP_CLIENT:
			ntlmssp_command = NTLMSSP_INITIAL;
			break;
		case NTLMSSP_SERVER:
			/* 'datagram' mode - no neg packet */
			ntlmssp_command = NTLMSSP_NEGOTIATE;
			break;
		default:
			DEBUG(1, ("Invalid role: %d\n", ntlmssp_state->role));
			return NT_STATUS_INVALID_PARAMETER;
		}
	} else {
		if (!msrpc_parse(ntlmssp_state, &input, "Cd",
				 "NTLMSSP",
				 &ntlmssp_command)) {
			DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
			dump_data(2, input.data, input.length);
			return NT_STATUS_INVALID_PARAMETER;
		}
	}

	if (ntlmssp_command != ntlmssp_state->expected_state) {
		DEBUG(1, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
		return NT_STATUS_INVALID_PARAMETER;
	}

	for (i=0; ntlmssp_callbacks[i].fn; i++) {
		if (ntlmssp_callbacks[i].role == ntlmssp_state->role
		    && ntlmssp_callbacks[i].ntlmssp_command == ntlmssp_command) {
			return ntlmssp_callbacks[i].fn(ntlmssp_state, ntlmssp_state, input, out);
		}
	}

	DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
		  ntlmssp_state->role, ntlmssp_command));

	return NT_STATUS_INVALID_PARAMETER;
}

/**
 * Create an NTLMSSP state machine
 *
 * @param ntlmssp_state NTLMSSP State, allocated by this function
 */

NTSTATUS ntlmssp_server_start(TALLOC_CTX *mem_ctx,
			      bool is_standalone,
			      const char *netbios_name,
			      const char *netbios_domain,
			      const char *dns_name,
			      const char *dns_domain,
			      struct ntlmssp_state **_ntlmssp_state)
{
	struct ntlmssp_state *ntlmssp_state;

	if (!netbios_name) {
		netbios_name = "";
	}

	if (!netbios_domain) {
		netbios_domain = "";
	}

	if (!dns_domain) {
		dns_domain = "";
	}

	if (!dns_name) {
		dns_name = "";
	}

	ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
	if (!ntlmssp_state) {
		return NT_STATUS_NO_MEMORY;
	}

	ntlmssp_state->role = NTLMSSP_SERVER;

	ntlmssp_state->get_challenge = get_challenge;
	ntlmssp_state->set_challenge = set_challenge;
	ntlmssp_state->may_set_challenge = may_set_challenge;

	ntlmssp_state->server.is_standalone = is_standalone;

	ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;

	ntlmssp_state->allow_lm_key = lp_lanman_auth();

	ntlmssp_state->neg_flags =
		NTLMSSP_NEGOTIATE_128 |
		NTLMSSP_NEGOTIATE_56 |
		NTLMSSP_NEGOTIATE_VERSION |
		NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
		NTLMSSP_NEGOTIATE_NTLM |
		NTLMSSP_NEGOTIATE_NTLM2 |
		NTLMSSP_NEGOTIATE_KEY_EXCH |
		NTLMSSP_NEGOTIATE_SIGN |
		NTLMSSP_NEGOTIATE_SEAL;

	ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
	if (!ntlmssp_state->server.netbios_name) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}
	ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
	if (!ntlmssp_state->server.netbios_domain) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}
	ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
	if (!ntlmssp_state->server.dns_name) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}
	ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
	if (!ntlmssp_state->server.dns_domain) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}

	*_ntlmssp_state = ntlmssp_state;
	return NT_STATUS_OK;
}

/*********************************************************************
 Client side NTLMSSP
*********************************************************************/

/**
 * Next state function for the Initial packet
 *
 * @param ntlmssp_state NTLMSSP State
 * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 * @param request The reply, as an allocated DATA_BLOB, caller to free.
 * @return Errors or NT_STATUS_OK.
 */

static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
				  TALLOC_CTX *out_mem_ctx, /* Unused at this time */
				  DATA_BLOB reply, DATA_BLOB *next_request)
{
	NTSTATUS status;

	if (ntlmssp_state->unicode) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
	} else {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
	}

	if (ntlmssp_state->use_ntlmv2) {
		ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
	}

	/* generate the ntlmssp negotiate packet */
	status = msrpc_gen(ntlmssp_state, next_request, "CddAA",
		  "NTLMSSP",
		  NTLMSSP_NEGOTIATE,
		  ntlmssp_state->neg_flags,
		  ntlmssp_state->client.netbios_domain,
		  ntlmssp_state->client.netbios_name);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("ntlmssp_client_initial: failed to generate "
			"ntlmssp negotiate packet\n"));
		return status;
	}

	if (DEBUGLEVEL >= 10) {
		struct NEGOTIATE_MESSAGE *negotiate = talloc(
			talloc_tos(), struct NEGOTIATE_MESSAGE);
		if (negotiate != NULL) {
			NTSTATUS status;
			status = ntlmssp_pull_NEGOTIATE_MESSAGE(
				next_request, negotiate, negotiate);
			if (NT_STATUS_IS_OK(status)) {
				NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
						negotiate);
			}
			TALLOC_FREE(negotiate);
		}
	}

	ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;

	return NT_STATUS_MORE_PROCESSING_REQUIRED;
}

/**
 * Next state function for the Challenge Packet.  Generate an auth packet.
 *
 * @param ntlmssp_state NTLMSSP State
 * @param request The request, as a DATA_BLOB.  reply.data must be NULL
 * @param request The reply, as an allocated DATA_BLOB, caller to free.
 * @return Errors or NT_STATUS_OK.
 */

static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
				         TALLOC_CTX *out_mem_ctx, /* Unused at this time */
					 const DATA_BLOB reply, DATA_BLOB *next_request)
{
	uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
	DATA_BLOB server_domain_blob;
	DATA_BLOB challenge_blob;
	DATA_BLOB struct_blob = data_blob_null;
	char *server_domain;
	const char *chal_parse_string;
	const char *auth_gen_string;
	DATA_BLOB lm_response = data_blob_null;
	DATA_BLOB nt_response = data_blob_null;
	DATA_BLOB session_key = data_blob_null;
	DATA_BLOB encrypted_session_key = data_blob_null;
	NTSTATUS nt_status = NT_STATUS_OK;

	if (ntlmssp_state->use_ccache) {
		struct wbcCredentialCacheParams params;
		struct wbcCredentialCacheInfo *info = NULL;
		struct wbcAuthErrorInfo *error = NULL;
		struct wbcNamedBlob auth_blob;
		struct wbcBlob *wbc_next = NULL;
		struct wbcBlob *wbc_session_key = NULL;
		wbcErr wbc_status;
		int i;

		params.account_name = ntlmssp_state->user;
		params.domain_name = ntlmssp_state->domain;
		params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;

		auth_blob.name = "challenge_blob";
		auth_blob.flags = 0;
		auth_blob.blob.data = reply.data;
		auth_blob.blob.length = reply.length;
		params.num_blobs = 1;
		params.blobs = &auth_blob;

		wbc_status = wbcCredentialCache(&params, &info, &error);
		wbcFreeMemory(error);
		if (!WBC_ERROR_IS_OK(wbc_status)) {
			goto noccache;
		}

		for (i=0; i<info->num_blobs; i++) {
			if (strequal(info->blobs[i].name, "auth_blob")) {
				wbc_next = &info->blobs[i].blob;
			}
			if (strequal(info->blobs[i].name, "session_key")) {
				wbc_session_key = &info->blobs[i].blob;
			}
		}
		if ((wbc_next == NULL) || (wbc_session_key == NULL)) {
			wbcFreeMemory(info);
			goto noccache;
		}

		*next_request = data_blob(wbc_next->data, wbc_next->length);
		ntlmssp_state->session_key = data_blob(
			wbc_session_key->data, wbc_session_key->length);

		wbcFreeMemory(info);
		goto done;
	}

noccache:

	if (!msrpc_parse(ntlmssp_state, &reply, "CdBd",
			 "NTLMSSP",
			 &ntlmssp_command,
			 &server_domain_blob,
			 &chal_flags)) {
		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
		dump_data(2, reply.data, reply.length);

		return NT_STATUS_INVALID_PARAMETER;
	}

	if (DEBUGLEVEL >= 10) {
		struct CHALLENGE_MESSAGE *challenge = talloc(
			talloc_tos(), struct CHALLENGE_MESSAGE);
		if (challenge != NULL) {
			NTSTATUS status;
			challenge->NegotiateFlags = chal_flags;
			status = ntlmssp_pull_CHALLENGE_MESSAGE(
				&reply, challenge, challenge);
			if (NT_STATUS_IS_OK(status)) {
				NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
						challenge);
			}
			TALLOC_FREE(challenge);
		}
	}

	data_blob_free(&server_domain_blob);

	DEBUG(3, ("Got challenge flags:\n"));
	debug_ntlmssp_flags(chal_flags);

	ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, lp_client_lanman_auth());

	if (ntlmssp_state->unicode) {
		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
			chal_parse_string = "CdUdbddB";
		} else {
			chal_parse_string = "CdUdbdd";
		}
		auth_gen_string = "CdBBUUUBd";
	} else {
		if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
			chal_parse_string = "CdAdbddB";
		} else {
			chal_parse_string = "CdAdbdd";
		}

		auth_gen_string = "CdBBAAABd";
	}

	DEBUG(3, ("NTLMSSP: Set final flags:\n"));
	debug_ntlmssp_flags(ntlmssp_state->neg_flags);

	if (!msrpc_parse(ntlmssp_state, &reply, chal_parse_string,
			 "NTLMSSP",
			 &ntlmssp_command,
			 &server_domain,
			 &chal_flags,
			 &challenge_blob, 8,
			 &unkn1, &unkn2,
			 &struct_blob)) {
		DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
		dump_data(2, reply.data, reply.length);
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
		ntlmssp_state->server.is_standalone = true;
	} else {
		ntlmssp_state->server.is_standalone = false;
	}
	/* TODO: parse struct_blob and fill in the rest */
	ntlmssp_state->server.netbios_name = "";
	ntlmssp_state->server.netbios_domain = server_domain;
	ntlmssp_state->server.dns_name = "";
	ntlmssp_state->server.dns_domain = "";

	if (challenge_blob.length != 8) {
		data_blob_free(&struct_blob);
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!ntlmssp_state->nt_hash || !ntlmssp_state->lm_hash) {
		static const uint8_t zeros[16] = {0, };
		/* do nothing - blobs are zero length */

		/* session key is all zeros */
		session_key = data_blob_talloc(ntlmssp_state, zeros, 16);

		/* not doing NLTM2 without a password */
		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
	} else if (ntlmssp_state->use_ntlmv2) {
		if (!struct_blob.length) {
			/* be lazy, match win2k - we can't do NTLMv2 without it */
			DEBUG(1, ("Server did not provide 'target information', required for NTLMv2\n"));
			return NT_STATUS_INVALID_PARAMETER;
		}

		/* TODO: if the remote server is standalone, then we should replace 'domain'
		   with the server name as supplied above */

		if (!SMBNTLMv2encrypt_hash(ntlmssp_state,
					   ntlmssp_state->user,
					   ntlmssp_state->domain,
					   ntlmssp_state->nt_hash, &challenge_blob,
					   &struct_blob,
					   &lm_response, &nt_response, NULL,
					   &session_key)) {
			data_blob_free(&challenge_blob);
			data_blob_free(&struct_blob);
			return NT_STATUS_NO_MEMORY;
		}
	} else if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
		struct MD5Context md5_session_nonce_ctx;
		uint8_t session_nonce[16];
		uint8_t session_nonce_hash[16];
		uint8_t user_session_key[16];

		lm_response = data_blob_talloc(ntlmssp_state, NULL, 24);
		generate_random_buffer(lm_response.data, 8);
		memset(lm_response.data+8, 0, 16);

		memcpy(session_nonce, challenge_blob.data, 8);
		memcpy(&session_nonce[8], lm_response.data, 8);

		MD5Init(&md5_session_nonce_ctx);
		MD5Update(&md5_session_nonce_ctx, challenge_blob.data, 8);
		MD5Update(&md5_session_nonce_ctx, lm_response.data, 8);
		MD5Final(session_nonce_hash, &md5_session_nonce_ctx);

		DEBUG(5, ("NTLMSSP challenge set by NTLM2\n"));
		DEBUG(5, ("challenge is: \n"));
		dump_data(5, session_nonce_hash, 8);

		nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
		SMBNTencrypt_hash(ntlmssp_state->nt_hash,
				  session_nonce_hash,
				  nt_response.data);

		session_key = data_blob_talloc(ntlmssp_state, NULL, 16);

		SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, user_session_key);
		hmac_md5(user_session_key, session_nonce, sizeof(session_nonce), session_key.data);
		dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
	} else {
		/* lanman auth is insecure, it may be disabled */
		if (lp_client_lanman_auth()) {
			lm_response = data_blob_talloc(ntlmssp_state,
						       NULL, 24);
			SMBencrypt_hash(ntlmssp_state->lm_hash,challenge_blob.data,
				   lm_response.data);
		}

		nt_response = data_blob_talloc(ntlmssp_state, NULL, 24);
		SMBNTencrypt_hash(ntlmssp_state->nt_hash,challenge_blob.data,
			     nt_response.data);

		session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
		if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
		    && lp_client_lanman_auth()) {
			SMBsesskeygen_lm_sess_key(ntlmssp_state->lm_hash, lm_response.data,
					session_key.data);
			dump_data_pw("LM session key\n", session_key.data, session_key.length);
		} else {
			SMBsesskeygen_ntv1(ntlmssp_state->nt_hash, session_key.data);
			dump_data_pw("NT session key:\n", session_key.data, session_key.length);
		}
	}
	data_blob_free(&struct_blob);

	/* Key exchange encryptes a new client-generated session key with
	   the password-derived key */
	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
		/* Make up a new session key */
		uint8_t client_session_key[16];
		generate_random_buffer(client_session_key, sizeof(client_session_key));

		/* Encrypt the new session key with the old one */
		encrypted_session_key = data_blob(client_session_key, sizeof(client_session_key));
		dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
		arcfour_crypt_blob(encrypted_session_key.data, encrypted_session_key.length, &session_key);
		dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);

		/* Mark the new session key as the 'real' session key */
		data_blob_free(&session_key);
		session_key = data_blob_talloc(ntlmssp_state,
					       client_session_key,
					       sizeof(client_session_key));
	}

	/* this generates the actual auth packet */
	nt_status = msrpc_gen(ntlmssp_state, next_request, auth_gen_string,
		       "NTLMSSP",
		       NTLMSSP_AUTH,
		       lm_response.data, lm_response.length,
		       nt_response.data, nt_response.length,
		       ntlmssp_state->domain,
		       ntlmssp_state->user,
		       ntlmssp_state->client.netbios_name,
		       encrypted_session_key.data, encrypted_session_key.length,
		       ntlmssp_state->neg_flags);

	if (!NT_STATUS_IS_OK(nt_status)) {
		return NT_STATUS_NO_MEMORY;
	}

	if (DEBUGLEVEL >= 10) {
		struct AUTHENTICATE_MESSAGE *authenticate = talloc(
			talloc_tos(), struct AUTHENTICATE_MESSAGE);
		if (authenticate != NULL) {
			NTSTATUS status;
			authenticate->NegotiateFlags =
				ntlmssp_state->neg_flags;
			status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
				next_request, authenticate, authenticate);
			if (NT_STATUS_IS_OK(status)) {
				NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
						authenticate);
			}
			TALLOC_FREE(authenticate);
		}
	}

	data_blob_free(&encrypted_session_key);

	data_blob_free(&ntlmssp_state->chal);

	ntlmssp_state->session_key = session_key;

	ntlmssp_state->chal = challenge_blob;
	ntlmssp_state->lm_resp = lm_response;
	ntlmssp_state->nt_resp = nt_response;

done:

	ntlmssp_state->expected_state = NTLMSSP_DONE;

	if (!NT_STATUS_IS_OK(nt_status = ntlmssp_sign_init(ntlmssp_state))) {
		DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status)));
	}

	return nt_status;
}

NTSTATUS ntlmssp_client_start(TALLOC_CTX *mem_ctx,
			      const char *netbios_name,
			      const char *netbios_domain,
			      bool use_ntlmv2,
			      struct ntlmssp_state **_ntlmssp_state)
{
	struct ntlmssp_state *ntlmssp_state;

	if (!netbios_name) {
		netbios_name = "";
	}

	if (!netbios_domain) {
		netbios_domain = "";
	}

	ntlmssp_state = talloc_zero(mem_ctx, struct ntlmssp_state);
	if (!ntlmssp_state) {
		return NT_STATUS_NO_MEMORY;
	}

	ntlmssp_state->role = NTLMSSP_CLIENT;

	ntlmssp_state->unicode = True;

	ntlmssp_state->use_ntlmv2 = use_ntlmv2;

	ntlmssp_state->expected_state = NTLMSSP_INITIAL;

	ntlmssp_state->neg_flags =
		NTLMSSP_NEGOTIATE_128 |
		NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
		NTLMSSP_NEGOTIATE_NTLM |
		NTLMSSP_NEGOTIATE_NTLM2 |
		NTLMSSP_NEGOTIATE_KEY_EXCH |
		NTLMSSP_REQUEST_TARGET;

	ntlmssp_state->client.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
	if (!ntlmssp_state->client.netbios_name) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}
	ntlmssp_state->client.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
	if (!ntlmssp_state->client.netbios_domain) {
		talloc_free(ntlmssp_state);
		return NT_STATUS_NO_MEMORY;
	}

	*_ntlmssp_state = ntlmssp_state;
	return NT_STATUS_OK;
}