summaryrefslogtreecommitdiff
path: root/source4/auth/ntlmssp/ntlmssp.c
blob: d90c908d8d63ba893f76f838daa1da7b080eefc1 (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
/* 
   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 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 "auth/ntlmssp/ntlmssp.h"
#include "../libcli/auth/libcli_auth.h"
#include "librpc/gen_ndr/ndr_dcerpc.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_proto.h"

/**
 * Callbacks for NTLMSSP - for both client and server operating modes
 * 
 */

static const struct ntlmssp_callbacks {
	enum ntlmssp_role role;
	enum ntlmssp_message_type command;
	NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
			    TALLOC_CTX *out_mem_ctx,
			    DATA_BLOB in, DATA_BLOB *out);
} ntlmssp_callbacks[] = {
	{
		.role		= NTLMSSP_CLIENT,
		.command	= NTLMSSP_INITIAL,
		.sync_fn	= ntlmssp_client_initial,
	},{
		.role		= NTLMSSP_SERVER,
		.command	= NTLMSSP_NEGOTIATE,
		.sync_fn	= gensec_ntlmssp_server_negotiate,
	},{
		.role		= NTLMSSP_CLIENT,
		.command	= NTLMSSP_CHALLENGE,
		.sync_fn	= ntlmssp_client_challenge,
	},{
		.role		= NTLMSSP_SERVER,
		.command	= NTLMSSP_AUTH,
		.sync_fn	= gensec_ntlmssp_server_auth,
	}
};


static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security, 
				     const DATA_BLOB *first_packet) 
{
	if (ntlmssp_blob_matches_magic(first_packet)) {
		return NT_STATUS_OK;
	} else {
		return NT_STATUS_INVALID_PARAMETER;
	}
}

static NTSTATUS gensec_ntlmssp_update_find(struct ntlmssp_state *ntlmssp_state,
					   const DATA_BLOB input, uint32_t *idx)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(ntlmssp_state->callback_private,
				      struct gensec_ntlmssp_context);
	struct gensec_security *gensec_security = gensec_ntlmssp->gensec_security;
	uint32_t ntlmssp_command;
	uint32_t i;

	if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
		/* We are strict here because other modules, which we
		 * don't fully control (such as GSSAPI) are also
		 * strict, but are tested less often */

		DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
		return NT_STATUS_INVALID_PARAMETER;
	}

	if (!input.length) {
		switch (ntlmssp_state->role) {
		case NTLMSSP_CLIENT:
			ntlmssp_command = NTLMSSP_INITIAL;
			break;
		case NTLMSSP_SERVER:
			if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
				/* 'datagram' mode - no neg packet */
				ntlmssp_command = NTLMSSP_NEGOTIATE;
			} else {
				/* This is normal in SPNEGO mech negotiation fallback */
				DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
				return NT_STATUS_INVALID_PARAMETER;
			}
			break;
		}
	} 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(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
		return NT_STATUS_INVALID_PARAMETER;
	}

	for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
		if (ntlmssp_callbacks[i].role == ntlmssp_state->role &&
		    ntlmssp_callbacks[i].command == ntlmssp_command) {
			*idx = i;
			return NT_STATUS_OK;
		}
	}

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

/**
 * Next state function for the wrapped NTLMSSP state machine
 * 
 * @param gensec_security GENSEC state, initialised to NTLMSSP
 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 * @param in The request, as a DATA_BLOB
 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent, 
 *                or NT_STATUS_OK if the user is authenticated. 
 */

static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security, 
				      TALLOC_CTX *out_mem_ctx, 
				      const DATA_BLOB input, DATA_BLOB *out)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
	NTSTATUS status;
	uint32_t i;

	*out = data_blob(NULL, 0);

	if (!out_mem_ctx) {
		/* if the caller doesn't want to manage/own the memory, 
		   we can put it on our context */
		out_mem_ctx = ntlmssp_state;
	}

	status = gensec_ntlmssp_update_find(ntlmssp_state, input, &i);
	NT_STATUS_NOT_OK_RETURN(status);

	status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
	NT_STATUS_NOT_OK_RETURN(status);
	
	return NT_STATUS_OK;
}

/**
 * Return the NTLMSSP master session key
 * 
 * @param ntlmssp_state NTLMSSP State
 */

NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security, 
				    TALLOC_CTX *mem_ctx,
				    DATA_BLOB *session_key)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;

	if (ntlmssp_state->expected_state != NTLMSSP_DONE) {
		return NT_STATUS_NO_USER_SESSION_KEY;
	}

	if (!ntlmssp_state->session_key.data) {
		return NT_STATUS_NO_USER_SESSION_KEY;
	}
	*session_key = data_blob_talloc(mem_ctx, ntlmssp_state->session_key.data, ntlmssp_state->session_key.length);
	if (!session_key->data) {
		return NT_STATUS_NO_MEMORY;
	}

	return NT_STATUS_OK;
}

static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
					uint32_t feature)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp =
		talloc_get_type_abort(gensec_security->private_data,
				      struct gensec_ntlmssp_context);
	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;

	if (feature & GENSEC_FEATURE_SIGN) {
		if (!ntlmssp_state->session_key.length) {
			return false;
		}
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_SEAL) {
		if (!ntlmssp_state->session_key.length) {
			return false;
		}
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_SESSION_KEY) {
		if (ntlmssp_state->session_key.length) {
			return true;
		}
	}
	if (feature & GENSEC_FEATURE_DCE_STYLE) {
		return true;
	}
	if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
		if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
			return true;
		}
	}
	return false;
}

NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
{
	struct gensec_ntlmssp_context *gensec_ntlmssp;
	struct ntlmssp_state *ntlmssp_state;

	gensec_ntlmssp = talloc_zero(gensec_security,
				     struct gensec_ntlmssp_context);
	if (!gensec_ntlmssp) {
		return NT_STATUS_NO_MEMORY;
	}

	gensec_ntlmssp->gensec_security = gensec_security;

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

	ntlmssp_state->callback_private = gensec_ntlmssp;

	gensec_ntlmssp->ntlmssp_state = ntlmssp_state;

	gensec_security->private_data = gensec_ntlmssp;
	return NT_STATUS_OK;
}

static const char *gensec_ntlmssp_oids[] = { 
	GENSEC_OID_NTLMSSP, 
	NULL
};

static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
	.name		= "ntlmssp",
	.sasl_name	= GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
	.auth_type	= DCERPC_AUTH_TYPE_NTLMSSP,
	.oid            = gensec_ntlmssp_oids,
	.client_start   = gensec_ntlmssp_client_start,
	.server_start   = gensec_ntlmssp_server_start,
	.magic 	        = gensec_ntlmssp_magic,
	.update 	= gensec_ntlmssp_update,
	.sig_size	= gensec_ntlmssp_sig_size,
	.sign_packet	= gensec_ntlmssp_sign_packet,
	.check_packet	= gensec_ntlmssp_check_packet,
	.seal_packet	= gensec_ntlmssp_seal_packet,
	.unseal_packet	= gensec_ntlmssp_unseal_packet,
	.wrap           = gensec_ntlmssp_wrap,
	.unwrap         = gensec_ntlmssp_unwrap,
	.session_key	= gensec_ntlmssp_session_key,
	.session_info   = gensec_ntlmssp_session_info,
	.have_feature   = gensec_ntlmssp_have_feature,
	.enabled        = true,
	.priority       = GENSEC_NTLMSSP
};


_PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
{
	NTSTATUS ret;

	ret = gensec_register(&gensec_ntlmssp_security_ops);
	if (!NT_STATUS_IS_OK(ret)) {
		DEBUG(0,("Failed to register '%s' gensec backend!\n",
			gensec_ntlmssp_security_ops.name));
		return ret;
	}

	return ret;
}