summaryrefslogtreecommitdiff
path: root/source4/auth/ntlmssp/ntlmssp_client.c
blob: 5fc7707e680361181e26ba9fc6aa9b3f04cd23dc (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
/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   handle NLTMSSP, client server side parsing

   Copyright (C) Andrew Tridgell      2001
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   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 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"
#include "auth/ntlmssp/ntlmssp.h"
#include "auth/ntlmssp/msrpc_parse.h"
#include "lib/crypto/crypto.h"
#include "libcli/auth/libcli_auth.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"

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

/**
 * Next state function for the Initial packet
 * 
 * @param ntlmssp_state NTLMSSP State
 * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
 * @param in A NULL data blob (input ignored)
 * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
 * @return Errors or NT_STATUS_OK. 
 */

NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security, 
				TALLOC_CTX *out_mem_ctx, 
				DATA_BLOB in, DATA_BLOB *out) 
{
	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;

	if (gensec_ntlmssp_state->unicode) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
	} else {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
	}
	
	if (gensec_ntlmssp_state->use_ntlmv2) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
	}

	/* generate the ntlmssp negotiate packet */
	msrpc_gen(out_mem_ctx, 
		  out, "CddAA",
		  "NTLMSSP",
		  NTLMSSP_NEGOTIATE,
		  gensec_ntlmssp_state->neg_flags,
		  gensec_ntlmssp_state->get_domain(), 
		  cli_credentials_get_workstation(gensec_security->credentials));

	gensec_ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;

	return NT_STATUS_MORE_PROCESSING_REQUIRED;
}

/**
 * Next state function for the Challenge Packet.  Generate an auth packet.
 * 
 * @param gensec_security GENSEC state
 * @param out_mem_ctx Memory context for *out
 * @param in The server challnege, as a DATA_BLOB.  reply.data must be NULL
 * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
 * @return Errors or NT_STATUS_OK. 
 */

NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security, 
				  TALLOC_CTX *out_mem_ctx,
				  const DATA_BLOB in, DATA_BLOB *out) 
{
	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
	uint32_t chal_flags, ntlmssp_command, unkn1, unkn2;
	DATA_BLOB server_domain_blob;
	DATA_BLOB challenge_blob;
	DATA_BLOB target_info = data_blob(NULL, 0);
	char *server_domain;
	const char *chal_parse_string;
	const char *auth_gen_string;
	DATA_BLOB lm_response = data_blob(NULL, 0);
	DATA_BLOB nt_response = data_blob(NULL, 0);
	DATA_BLOB session_key = data_blob(NULL, 0);
	DATA_BLOB lm_session_key = data_blob(NULL, 0);
	DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
	NTSTATUS nt_status;
	int flags = 0;
	const char *user, *domain;

	TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
	if (!mem_ctx) {
		return NT_STATUS_NO_MEMORY;
	}

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

		return NT_STATUS_INVALID_PARAMETER;
	}
	
	data_blob_free(&server_domain_blob);

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

	ntlmssp_handle_neg_flags(gensec_ntlmssp_state, chal_flags, gensec_ntlmssp_state->allow_lm_key);

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

		auth_gen_string = "CdBBAAABd";
	}

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

	gensec_ntlmssp_state->server_domain = server_domain;

	if (challenge_blob.length != 8) {
		talloc_free(mem_ctx);
		return NT_STATUS_INVALID_PARAMETER;
	}

	cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx, 
						 &user, &domain);

	if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
		flags |= CLI_CRED_NTLM2;
	}
	if (gensec_ntlmssp_state->use_ntlmv2) {
		flags |= CLI_CRED_NTLMv2_AUTH;
	}
	if (gensec_ntlmssp_state->use_nt_response) {
		flags |= CLI_CRED_NTLM_AUTH;
	}
	if (lp_client_lanman_auth()) {
		flags |= CLI_CRED_LANMAN_AUTH;
	}

	nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx, 
						      &flags, challenge_blob, target_info,
						      &lm_response, &nt_response, 
						      &lm_session_key, &session_key);

	if (!NT_STATUS_IS_OK(nt_status)) {
		return nt_status;
	}
	
	if (!(flags & CLI_CRED_LANMAN_AUTH)) {
		/* LM Key is still possible, just silly.  Fortunetly
		 * we require command line options to end up here */
		/* gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; */
	}

	if (!(flags & CLI_CRED_NTLM2)) {
		/* NTLM2 is incompatible... */
		gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
	}
	
	if ((gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) 
	    && lp_client_lanman_auth() && lm_session_key.length == 16) {
		DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
		if (lm_response.length == 24) {
			SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data, 
						  new_session_key.data);
		} else {
			static const uint8_t zeros[24];
			SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
						  new_session_key.data);
		}
		session_key = new_session_key;
		dump_data_pw("LM session key\n", session_key.data, session_key.length);
	}


	/* Key exchange encryptes a new client-generated session key with
	   the password-derived key */
	if (gensec_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_talloc(gensec_ntlmssp_state, 
							 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(encrypted_session_key.data, session_key.data, encrypted_session_key.length);
		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 */
		session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
	}

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

	/* this generates the actual auth packet */
	if (!msrpc_gen(mem_ctx, 
		       out, auth_gen_string, 
		       "NTLMSSP", 
		       NTLMSSP_AUTH, 
		       lm_response.data, lm_response.length,
		       nt_response.data, nt_response.length,
		       domain, 
		       user, 
		       cli_credentials_get_workstation(gensec_security->credentials),
		       encrypted_session_key.data, encrypted_session_key.length,
		       gensec_ntlmssp_state->neg_flags)) {
		talloc_free(mem_ctx);
		return NT_STATUS_NO_MEMORY;
	}

	gensec_ntlmssp_state->session_key = session_key;
	talloc_steal(gensec_ntlmssp_state, session_key.data);

	talloc_steal(out_mem_ctx, out->data);

	gensec_ntlmssp_state->chal = challenge_blob;
	gensec_ntlmssp_state->lm_resp = lm_response;
	talloc_steal(gensec_ntlmssp_state->lm_resp.data, lm_response.data);
	gensec_ntlmssp_state->nt_resp = nt_response;
	talloc_steal(gensec_ntlmssp_state->nt_resp.data, nt_response.data);

	gensec_ntlmssp_state->expected_state = NTLMSSP_DONE;

	if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) {
		nt_status = ntlmssp_sign_init(gensec_ntlmssp_state);
		if (!NT_STATUS_IS_OK(nt_status)) {
			DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", 
				  nt_errstr(nt_status)));
			talloc_free(mem_ctx);
			return nt_status;
		}
	}

	talloc_free(mem_ctx);
	return NT_STATUS_OK;
}

NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
{
	struct gensec_ntlmssp_state *gensec_ntlmssp_state;
	NTSTATUS nt_status;

	nt_status = gensec_ntlmssp_start(gensec_security);
	NT_STATUS_NOT_OK_RETURN(nt_status);

	gensec_ntlmssp_state = gensec_security->private_data;

	gensec_ntlmssp_state->role = NTLMSSP_CLIENT;

	gensec_ntlmssp_state->get_domain = lp_workgroup;

	gensec_ntlmssp_state->unicode = lp_parm_bool(-1, "ntlmssp_client", "unicode", True);

	gensec_ntlmssp_state->use_nt_response = lp_parm_bool(-1, "ntlmssp_client", "send_nt_reponse", True);

	gensec_ntlmssp_state->allow_lm_key = (lp_client_lanman_auth() 
					      && (lp_parm_bool(-1, "ntlmssp_client", "allow_lm_key", False)
						  || lp_parm_bool(-1, "ntlmssp_client", "lm_key", False)));

	gensec_ntlmssp_state->use_ntlmv2 = lp_client_ntlmv2_auth();

	gensec_ntlmssp_state->expected_state = NTLMSSP_INITIAL;

	gensec_ntlmssp_state->neg_flags = 
		NTLMSSP_NEGOTIATE_NTLM |
		NTLMSSP_REQUEST_TARGET;

	if (lp_parm_bool(-1, "ntlmssp_client", "128bit", True)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;		
	}

	if (lp_parm_bool(-1, "ntlmssp_client", "56bit", False)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;		
	}

	if (lp_parm_bool(-1, "ntlmssp_client", "lm_key", False)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
	}

	if (lp_parm_bool(-1, "ntlmssp_client", "keyexchange", True)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;		
	}

	if (lp_parm_bool(-1, "ntlmssp_client", "alwayssign", True)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;		
	}

	if (lp_parm_bool(-1, "ntlmssp_client", "ntlm2", True)) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;		
	} else {
		/* apparently we can't do ntlmv2 if we don't do ntlm2 */
		gensec_ntlmssp_state->use_ntlmv2 = False;
	}

	if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
		/*
		 * 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.
		 * 
		 * Without this, Windows will not create the master key
		 * that it thinks is only used for NTLMSSP signing and 
		 * sealing.  (It is actually pulled out and used directly) 
		 */
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
	}
	if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
		gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
	}

	gensec_security->private_data = gensec_ntlmssp_state;

	return NT_STATUS_OK;
}