summaryrefslogtreecommitdiffstats
path: root/source3/smbd/smb2_ioctl.c
blob: 6a19fcb7689230eaa090e948e35625669adaf840 (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
/*
   Unix SMB/CIFS implementation.
   Core SMB2 server

   Copyright (C) Stefan Metzmacher 2009

   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"
#include "include/ntioctl.h"
#include "smb2_ioctl_private.h"
#include "librpc/gen_ndr/ioctl.h"

static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
					       struct tevent_context *ev,
					       struct smbd_smb2_request *smb2req,
					       struct files_struct *in_fsp,
					       uint32_t in_ctl_code,
					       DATA_BLOB in_input,
					       uint32_t in_max_output,
					       uint32_t in_flags);
static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
				     TALLOC_CTX *mem_ctx,
				     DATA_BLOB *out_output,
				     bool *disconnect);

static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_ioctl(struct smbd_smb2_request *req)
{
	NTSTATUS status;
	const uint8_t *inbody;
	uint32_t min_buffer_offset;
	uint32_t max_buffer_offset;
	uint32_t min_output_offset;
	uint32_t allowed_length_in;
	uint32_t allowed_length_out;
	uint32_t in_ctl_code;
	uint64_t in_file_id_persistent;
	uint64_t in_file_id_volatile;
	struct files_struct *in_fsp = NULL;
	uint32_t in_input_offset;
	uint32_t in_input_length;
	DATA_BLOB in_input_buffer = data_blob_null;
	uint32_t in_max_input_length;
	uint32_t in_output_offset;
	uint32_t in_output_length;
	DATA_BLOB in_output_buffer = data_blob_null;
	uint32_t in_max_output_length;
	uint32_t in_flags;
	uint32_t data_length_in;
	uint32_t data_length_out;
	uint32_t data_length_tmp;
	uint32_t data_length_max;
	struct tevent_req *subreq;

	status = smbd_smb2_request_verify_sizes(req, 0x39);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}
	inbody = SMBD_SMB2_IN_BODY_PTR(req);

	in_ctl_code		= IVAL(inbody, 0x04);
	in_file_id_persistent	= BVAL(inbody, 0x08);
	in_file_id_volatile	= BVAL(inbody, 0x10);
	in_input_offset		= IVAL(inbody, 0x18);
	in_input_length		= IVAL(inbody, 0x1C);
	in_max_input_length	= IVAL(inbody, 0x20);
	in_output_offset	= IVAL(inbody, 0x24);
	in_output_length	= IVAL(inbody, 0x28);
	in_max_output_length	= IVAL(inbody, 0x2C);
	in_flags		= IVAL(inbody, 0x30);

	min_buffer_offset = SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req);
	max_buffer_offset = min_buffer_offset + SMBD_SMB2_IN_DYN_LEN(req);
	min_output_offset = min_buffer_offset;

	/*
	 * InputOffset (4 bytes): The offset, in bytes, from the beginning of
	 * the SMB2 header to the input data buffer. If no input data is
	 * required for the FSCTL/IOCTL command being issued, the client SHOULD
	 * set this value to 0.<49>
	 * <49> If no input data is required for the FSCTL/IOCTL command being
	 * issued, Windows-based clients set this field to any value.
	 */
	allowed_length_in = 0;
	if ((in_input_offset > 0) && (in_input_length > 0)) {
		uint32_t tmp_ofs;

		if (in_input_offset < min_buffer_offset) {
			return smbd_smb2_request_error(req,
					NT_STATUS_INVALID_PARAMETER);
		}
		if (in_input_offset > max_buffer_offset) {
			return smbd_smb2_request_error(req,
					NT_STATUS_INVALID_PARAMETER);
		}
		allowed_length_in = max_buffer_offset - in_input_offset;

		tmp_ofs = in_input_offset - min_buffer_offset;
		in_input_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
		in_input_buffer.data += tmp_ofs;
		in_input_buffer.length = in_input_length;
		min_output_offset += tmp_ofs;
		min_output_offset += in_input_length;
	}

	if (in_input_length > allowed_length_in) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	allowed_length_out = 0;
	if (in_output_offset > 0) {
		if (in_output_offset < min_buffer_offset) {
			return smbd_smb2_request_error(req,
					NT_STATUS_INVALID_PARAMETER);
		}
		if (in_output_offset > max_buffer_offset) {
			return smbd_smb2_request_error(req,
					NT_STATUS_INVALID_PARAMETER);
		}
		allowed_length_out = max_buffer_offset - in_output_offset;
	}

	if (in_output_length > allowed_length_out) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	if (in_output_length > 0) {
		uint32_t tmp_ofs;

		if (in_output_offset < min_output_offset) {
			return smbd_smb2_request_error(req,
					NT_STATUS_INVALID_PARAMETER);
		}

		tmp_ofs = in_output_offset - min_buffer_offset;
		in_output_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
		in_output_buffer.data += tmp_ofs;
		in_output_buffer.length = in_output_length;
	}

	/*
	 * verify the credits and avoid overflows
	 * in_input_buffer.length and in_output_buffer.length
	 * are already verified.
	 */
	data_length_in = in_input_buffer.length + in_output_buffer.length;

	data_length_out = in_max_input_length;
	data_length_tmp = UINT32_MAX - data_length_out;
	if (data_length_tmp < in_max_output_length) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}
	data_length_out += in_max_output_length;

	data_length_max = MAX(data_length_in, data_length_out);

	status = smbd_smb2_request_verify_creditcharge(req, data_length_max);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}

	/*
	 * If the Flags field of the request is not SMB2_0_IOCTL_IS_FSCTL the
	 * server MUST fail the request with STATUS_NOT_SUPPORTED.
	 */
	if (in_flags != SMB2_IOCTL_FLAG_IS_FSCTL) {
		return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
	}

	switch (in_ctl_code) {
	case FSCTL_DFS_GET_REFERRALS:
	case FSCTL_DFS_GET_REFERRALS_EX:
	case FSCTL_PIPE_WAIT:
	case FSCTL_VALIDATE_NEGOTIATE_INFO_224:
	case FSCTL_VALIDATE_NEGOTIATE_INFO:
	case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
		/*
		 * Some SMB2 specific CtlCodes like FSCTL_DFS_GET_REFERRALS or
		 * FSCTL_PIPE_WAIT does not take a file handle.
		 *
		 * If FileId in the SMB2 Header of the request is not
		 * 0xFFFFFFFFFFFFFFFF, then the server MUST fail the request
		 * with STATUS_INVALID_PARAMETER.
		 */
		if (in_file_id_persistent != UINT64_MAX ||
		    in_file_id_volatile != UINT64_MAX) {
			return smbd_smb2_request_error(req,
				NT_STATUS_INVALID_PARAMETER);
		}
		break;
	default:
		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);
		}
		break;
	}

	subreq = smbd_smb2_ioctl_send(req, req->sconn->ev_ctx,
				      req, in_fsp,
				      in_ctl_code,
				      in_input_buffer,
				      in_max_output_length,
				      in_flags);
	if (subreq == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}
	tevent_req_set_callback(subreq, smbd_smb2_request_ioctl_done, req);

	return smbd_smb2_request_pending_queue(req, subreq, 1000);
}

/*
 * 3.3.4.4 Sending an Error Response
 * An error code other than one of the following indicates a failure:
 */
static bool smbd_smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
				       size_t data_size)
{
	if (NT_STATUS_IS_OK(status)) {
		return false;
	}

	/*
	 * STATUS_BUFFER_OVERFLOW in a FSCTL_PIPE_TRANSCEIVE, FSCTL_PIPE_PEEK or
	 * FSCTL_DFS_GET_REFERRALS Response specified in section 2.2.32.<153>
	 */
	if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
	 && ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
	  || (ctl_code == FSCTL_PIPE_PEEK)
	  || (ctl_code == FSCTL_DFS_GET_REFERRALS))) {
		return false;
	}

	/*
	 * Any status other than STATUS_SUCCESS in a FSCTL_SRV_COPYCHUNK or
	 * FSCTL_SRV_COPYCHUNK_WRITE Response, when returning an
	 * SRV_COPYCHUNK_RESPONSE as described in section 2.2.32.1.
	 */
	if (((ctl_code == FSCTL_SRV_COPYCHUNK)
				|| (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE))
	 && (data_size == sizeof(struct srv_copychunk_rsp))) {
		return false;
	}

	return true;
}

static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
{
	struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
					struct smbd_smb2_request);
	const uint8_t *inbody;
	DATA_BLOB outbody;
	DATA_BLOB outdyn;
	uint32_t in_ctl_code;
	uint64_t in_file_id_persistent;
	uint64_t in_file_id_volatile;
	uint32_t out_input_offset;
	uint32_t out_output_offset;
	DATA_BLOB out_output_buffer = data_blob_null;
	NTSTATUS status;
	NTSTATUS error; /* transport error */
	bool disconnect = false;

	status = smbd_smb2_ioctl_recv(subreq, req,
				      &out_output_buffer,
				      &disconnect);

	DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
		"%u status %s\n",
		(unsigned int)out_output_buffer.length,
		nt_errstr(status) ));

	TALLOC_FREE(subreq);
	if (disconnect) {
		error = status;
		smbd_server_connection_terminate(req->sconn,
						 nt_errstr(error));
		return;
	}

	inbody = SMBD_SMB2_IN_BODY_PTR(req);

	in_ctl_code		= IVAL(inbody, 0x04);
	in_file_id_persistent	= BVAL(inbody, 0x08);
	in_file_id_volatile	= BVAL(inbody, 0x10);

	if (smbd_smb2_ioctl_is_failure(in_ctl_code, status,
				       out_output_buffer.length)) {
		error = smbd_smb2_request_error(req, status);
		if (!NT_STATUS_IS_OK(error)) {
			smbd_server_connection_terminate(req->sconn,
							 nt_errstr(error));
			return;
		}
		return;
	}

	out_input_offset = SMB2_HDR_BODY + 0x30;
	out_output_offset = SMB2_HDR_BODY + 0x30;

	outbody = smbd_smb2_generate_outbody(req, 0x30);
	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->sconn,
							 nt_errstr(error));
			return;
		}
		return;
	}

	SSVAL(outbody.data, 0x00, 0x30 + 1);	/* struct size */
	SSVAL(outbody.data, 0x02, 0);		/* reserved */
	SIVAL(outbody.data, 0x04,
	      in_ctl_code);			/* ctl code */
	SBVAL(outbody.data, 0x08,
	      in_file_id_persistent);		/* file id (persistent) */
	SBVAL(outbody.data, 0x10,
	      in_file_id_volatile);		/* file id (volatile) */
	SIVAL(outbody.data, 0x18,
	      out_input_offset);		/* input offset */
	SIVAL(outbody.data, 0x1C, 0);		/* input count */
	SIVAL(outbody.data, 0x20,
	      out_output_offset);		/* output offset */
	SIVAL(outbody.data, 0x24,
	      out_output_buffer.length);	/* output count */
	SIVAL(outbody.data, 0x28, 0);		/* flags */
	SIVAL(outbody.data, 0x2C, 0);		/* reserved */

	/*
	 * Note: Windows Vista and 2008 send back also the
	 *       input from the request. But it was fixed in
	 *       Windows 7.
	 */
	outdyn = out_output_buffer;

	error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
					  __location__);
	if (!NT_STATUS_IS_OK(error)) {
		smbd_server_connection_terminate(req->sconn,
						 nt_errstr(error));
		return;
	}
}

static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
					       struct tevent_context *ev,
					       struct smbd_smb2_request *smb2req,
					       struct files_struct *fsp,
					       uint32_t in_ctl_code,
					       DATA_BLOB in_input,
					       uint32_t in_max_output,
					       uint32_t in_flags)
{
	struct tevent_req *req;
	struct smbd_smb2_ioctl_state *state;
	struct smb_request *smbreq;

	req = tevent_req_create(mem_ctx, &state,
				struct smbd_smb2_ioctl_state);
	if (req == NULL) {
		return NULL;
	}
	state->smb2req = smb2req;
	state->smbreq = NULL;
	state->fsp = fsp;
	state->in_input = in_input;
	state->in_max_output = in_max_output;
	state->out_output = data_blob_null;

	DEBUG(10, ("smbd_smb2_ioctl: ctl_code[0x%08x] %s, %s\n",
		   (unsigned)in_ctl_code,
		   fsp ? fsp_str_dbg(fsp) : "<no handle>",
		   fsp_fnum_dbg(fsp)));

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

	switch (in_ctl_code & IOCTL_DEV_TYPE_MASK) {
	case FSCTL_DFS:
		return smb2_ioctl_dfs(in_ctl_code, ev, req, state);
		break;
	case FSCTL_FILESYSTEM:
		return smb2_ioctl_filesys(in_ctl_code, ev, req, state);
		break;
	case FSCTL_NAMED_PIPE:
		return smb2_ioctl_named_pipe(in_ctl_code, ev, req, state);
		break;
	case FSCTL_NETWORK_FILESYSTEM:
		return smb2_ioctl_network_fs(in_ctl_code, ev, req, state);
		break;
	default:
		if (IS_IPC(smbreq->conn)) {
			tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
		} else {
			tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
		}

		return tevent_req_post(req, ev);
		break;
	}

	tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
	return tevent_req_post(req, ev);
}

static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
				     TALLOC_CTX *mem_ctx,
				     DATA_BLOB *out_output,
				     bool *disconnect)
{
	NTSTATUS status = NT_STATUS_OK;
	struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
					      struct smbd_smb2_ioctl_state);
	enum tevent_req_state req_state;
	uint64_t err;

	*disconnect = state->disconnect;

	if ((tevent_req_is_error(req, &req_state, &err) == false)
	 || (req_state == TEVENT_REQ_USER_ERROR)) {
		/*
		 * Return output buffer to caller if the ioctl was successfully
		 * processed, even if a user error occurred. Some ioctls return
		 * data on failure.
		 */
		*out_output = state->out_output;
		talloc_steal(mem_ctx, out_output->data);
	}

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