summaryrefslogtreecommitdiffstats
path: root/source3/smbd/smb2_notify.c
blob: 8cccd90b3fb03c257948cb479bc753c0bdfdf296 (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
/*
   Unix SMB/CIFS implementation.
   Core SMB2 server

   Copyright (C) Stefan Metzmacher 2009
   Copyright (C) Jeremy Allison 2010

   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/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/util/tevent_ntstatus.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_SMB2

struct smbd_smb2_notify_state {
	struct smbd_smb2_request *smb2req;
	struct smb_request *smbreq;
	bool has_request;
	bool skip_reply;
	NTSTATUS status;
	DATA_BLOB out_output_buffer;
};

static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
						struct tevent_context *ev,
						struct smbd_smb2_request *smb2req,
						struct files_struct *in_fsp,
						uint16_t in_flags,
						uint32_t in_output_buffer_length,
						uint64_t in_completion_filter);
static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
				      TALLOC_CTX *mem_ctx,
				      DATA_BLOB *out_output_buffer);

static void smbd_smb2_request_notify_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_notify(struct smbd_smb2_request *req)
{
	struct smbXsrv_connection *xconn = req->xconn;
	NTSTATUS status;
	const uint8_t *inbody;
	uint16_t in_flags;
	uint32_t in_output_buffer_length;
	uint64_t in_file_id_persistent;
	uint64_t in_file_id_volatile;
	struct files_struct *in_fsp;
	uint64_t in_completion_filter;
	struct tevent_req *subreq;

	status = smbd_smb2_request_verify_sizes(req, 0x20);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}
	inbody = SMBD_SMB2_IN_BODY_PTR(req);

	in_flags		= SVAL(inbody, 0x02);
	in_output_buffer_length	= IVAL(inbody, 0x04);
	in_file_id_persistent	= BVAL(inbody, 0x08);
	in_file_id_volatile	= BVAL(inbody, 0x10);
	in_completion_filter	= IVAL(inbody, 0x18);

	/*
	 * 0x00010000 is what Windows 7 uses,
	 * Windows 2008 uses 0x00080000
	 */
	if (in_output_buffer_length > xconn->smb2.server.max_trans) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	status = smbd_smb2_request_verify_creditcharge(req,
						in_output_buffer_length);

	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}

	in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
	if (in_fsp == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
	}

	subreq = smbd_smb2_notify_send(req, req->sconn->ev_ctx,
				       req, in_fsp,
				       in_flags,
				       in_output_buffer_length,
				       in_completion_filter);
	if (subreq == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}
	tevent_req_set_callback(subreq, smbd_smb2_request_notify_done, req);

	return smbd_smb2_request_pending_queue(req, subreq, 500);
}

static void smbd_smb2_request_notify_done(struct tevent_req *subreq)
{
	struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
					struct smbd_smb2_request);
	DATA_BLOB outbody;
	DATA_BLOB outdyn;
	uint16_t out_output_buffer_offset;
	DATA_BLOB out_output_buffer = data_blob_null;
	NTSTATUS status;
	NTSTATUS error; /* transport error */

	status = smbd_smb2_notify_recv(subreq,
				       req,
				       &out_output_buffer);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		error = smbd_smb2_request_error(req, status);
		if (!NT_STATUS_IS_OK(error)) {
			smbd_server_connection_terminate(req->xconn,
							 nt_errstr(error));
			return;
		}
		return;
	}

	out_output_buffer_offset = SMB2_HDR_BODY + 0x08;

	outbody = smbd_smb2_generate_outbody(req, 0x08);
	if (outbody.data == NULL) {
		error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
		if (!NT_STATUS_IS_OK(error)) {
			smbd_server_connection_terminate(req->xconn,
							 nt_errstr(error));
			return;
		}
		return;
	}

	SSVAL(outbody.data, 0x00, 0x08 + 1);	/* struct size */
	SSVAL(outbody.data, 0x02,
	      out_output_buffer_offset);	/* output buffer offset */
	SIVAL(outbody.data, 0x04,
	      out_output_buffer.length);	/* output buffer length */

	outdyn = out_output_buffer;

	error = smbd_smb2_request_done(req, outbody, &outdyn);
	if (!NT_STATUS_IS_OK(error)) {
		smbd_server_connection_terminate(req->xconn,
						 nt_errstr(error));
		return;
	}
}

static void smbd_smb2_notify_reply(struct smb_request *smbreq,
				   NTSTATUS error_code,
				   uint8_t *buf, size_t len);
static bool smbd_smb2_notify_cancel(struct tevent_req *req);

static int smbd_smb2_notify_state_destructor(struct smbd_smb2_notify_state *state)
{
	if (!state->has_request) {
		return 0;
	}

	state->skip_reply = true;
	smbd_notify_cancel_by_smbreq(state->smbreq);
	return 0;
}

static int smbd_smb2_notify_smbreq_destructor(struct smb_request *smbreq)
{
	struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
						       struct tevent_req);
	struct smbd_smb2_notify_state *state = tevent_req_data(req,
					       struct smbd_smb2_notify_state);

	/*
	 * Our temporary parent from change_notify_add_request()
	 * goes away.
	 */
	state->has_request = false;

	/*
	 * move it back to its original parent,
	 * which means we no longer need the destructor
	 * to protect it.
	 */
	talloc_steal(smbreq->smb2req, smbreq);
	talloc_set_destructor(smbreq, NULL);

	/*
	 * We want to keep smbreq!
	 */
	return -1;
}

static struct tevent_req *smbd_smb2_notify_send(TALLOC_CTX *mem_ctx,
						struct tevent_context *ev,
						struct smbd_smb2_request *smb2req,
						struct files_struct *fsp,
						uint16_t in_flags,
						uint32_t in_output_buffer_length,
						uint64_t in_completion_filter)
{
	struct tevent_req *req;
	struct smbd_smb2_notify_state *state;
	struct smb_request *smbreq;
	connection_struct *conn = smb2req->tcon->compat;
	bool recursive = (in_flags & SMB2_WATCH_TREE) ? true : false;
	NTSTATUS status;

	req = tevent_req_create(mem_ctx, &state,
				struct smbd_smb2_notify_state);
	if (req == NULL) {
		return NULL;
	}
	state->smb2req = smb2req;
	state->status = NT_STATUS_INTERNAL_ERROR;
	state->out_output_buffer = data_blob_null;
	talloc_set_destructor(state, smbd_smb2_notify_state_destructor);

	DEBUG(10,("smbd_smb2_notify_send: %s - %s\n",
		  fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));

	smbreq = smbd_smb2_fake_smb_request(smb2req, fsp);
	if (tevent_req_nomem(smbreq, req)) {
		return tevent_req_post(req, ev);
	}

	state->smbreq = smbreq;
	smbreq->async_priv = (void *)req;

	if (DEBUGLEVEL >= 3) {
		char *filter_string;

		filter_string = notify_filter_string(NULL, in_completion_filter);
		if (tevent_req_nomem(filter_string, req)) {
			return tevent_req_post(req, ev);
		}

		DEBUG(3,("smbd_smb2_notify_send: notify change "
			 "called on %s, filter = %s, recursive = %d\n",
			 fsp_str_dbg(fsp), filter_string, recursive));

		TALLOC_FREE(filter_string);
	}

	if ((!fsp->fsp_flags.is_directory) || (conn != fsp->conn)) {
		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
		return tevent_req_post(req, ev);
	}

	if (fsp->notify == NULL) {

		status = change_notify_create(fsp,
					      in_output_buffer_length,
					      in_completion_filter,
					      recursive);
		if (tevent_req_nterror(req, status)) {
			DEBUG(10, ("change_notify_create returned %s\n",
				   nt_errstr(status)));
			return tevent_req_post(req, ev);
		}
	}

	if (change_notify_fsp_has_changes(fsp)) {

		/*
		 * We've got changes pending, respond immediately
		 */

		/*
		 * TODO: write a torture test to check the filtering behaviour
		 * here.
		 */

		change_notify_reply(smbreq,
				    NT_STATUS_OK,
				    in_output_buffer_length,
				    fsp->notify,
				    smbd_smb2_notify_reply);

		/*
		 * change_notify_reply() above has independently
		 * called tevent_req_done().
		 */
		return tevent_req_post(req, ev);
	}

	/*
	 * No changes pending, queue the request
	 */

	status = change_notify_add_request(smbreq,
			in_output_buffer_length,
			in_completion_filter,
			recursive, fsp,
			smbd_smb2_notify_reply);
	if (tevent_req_nterror(req, status)) {
		return tevent_req_post(req, ev);
	}

	/*
	 * This is a HACK!
	 *
	 * change_notify_add_request() talloc_moves()
	 * smbreq away from us, so we need a destructor
	 * which moves it back at the end.
	 */
	state->has_request = true;
	talloc_set_destructor(smbreq, smbd_smb2_notify_smbreq_destructor);

	/* allow this request to be canceled */
	tevent_req_set_cancel_fn(req, smbd_smb2_notify_cancel);

	SMBPROFILE_IOBYTES_ASYNC_SET_IDLE(state->smb2req->profile);
	return req;
}

static void smbd_smb2_notify_reply(struct smb_request *smbreq,
				   NTSTATUS error_code,
				   uint8_t *buf, size_t len)
{
	struct tevent_req *req = talloc_get_type_abort(smbreq->async_priv,
						       struct tevent_req);
	struct smbd_smb2_notify_state *state = tevent_req_data(req,
					       struct smbd_smb2_notify_state);

	if (state->skip_reply) {
		return;
	}

	SMBPROFILE_IOBYTES_ASYNC_SET_BUSY(state->smb2req->profile);

	state->status = error_code;
	if (!NT_STATUS_IS_OK(error_code)) {
		/* nothing */
	} else if (len == 0) {
		state->status = NT_STATUS_NOTIFY_ENUM_DIR;
	} else {
		state->out_output_buffer = data_blob_talloc(state, buf, len);
		if (state->out_output_buffer.data == NULL) {
			state->status = NT_STATUS_NO_MEMORY;
		}
	}

	tevent_req_defer_callback(req, state->smb2req->sconn->ev_ctx);

	if (tevent_req_nterror(req, state->status)) {
		return;
	}

	tevent_req_done(req);
}

static bool smbd_smb2_notify_cancel(struct tevent_req *req)
{
	struct smbd_smb2_notify_state *state = tevent_req_data(req,
					       struct smbd_smb2_notify_state);

	smbd_notify_cancel_by_smbreq(state->smbreq);

	return true;
}

static NTSTATUS smbd_smb2_notify_recv(struct tevent_req *req,
				      TALLOC_CTX *mem_ctx,
				      DATA_BLOB *out_output_buffer)
{
	NTSTATUS status;
	struct smbd_smb2_notify_state *state = tevent_req_data(req,
					       struct smbd_smb2_notify_state);

	if (tevent_req_is_nterror(req, &status)) {
		tevent_req_received(req);
		return status;
	}

	*out_output_buffer = state->out_output_buffer;
	talloc_steal(mem_ctx, out_output_buffer->data);

	tevent_req_received(req);
	return NT_STATUS_OK;
}