summaryrefslogtreecommitdiff
path: root/source3/smbd/smb2_tcon.c
blob: 2cf91af3ff5ed857c8d159b987e75b197fb11d0e (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
/*
   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 "../libcli/security/security.h"
#include "auth.h"
#include "lib/param/loadparm.h"
#include "../lib/util/tevent_ntstatus.h"

static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
					struct tevent_context *ev,
					struct smbd_smb2_request *smb2req,
					const char *in_path);
static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
					    uint8_t *out_share_type,
					    uint32_t *out_share_flags,
					    uint32_t *out_capabilities,
					    uint32_t *out_maximal_access,
					    uint32_t *out_tree_id);

static void smbd_smb2_request_tcon_done(struct tevent_req *subreq);

NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
{
	const uint8_t *inbody;
	uint16_t in_path_offset;
	uint16_t in_path_length;
	DATA_BLOB in_path_buffer;
	char *in_path_string;
	size_t in_path_string_size;
	NTSTATUS status;
	bool ok;
	struct tevent_req *subreq;

	status = smbd_smb2_request_verify_sizes(req, 0x09);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}
	inbody = SMBD_SMB2_IN_BODY_PTR(req);

	in_path_offset = SVAL(inbody, 0x04);
	in_path_length = SVAL(inbody, 0x06);

	if (in_path_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	if (in_path_length > SMBD_SMB2_IN_DYN_LEN(req)) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	in_path_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
	in_path_buffer.length = in_path_length;

	ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
				   in_path_buffer.data,
				   in_path_buffer.length,
				   &in_path_string,
				   &in_path_string_size);
	if (!ok) {
		return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
	}

	if (in_path_buffer.length == 0) {
		in_path_string_size = 0;
	}

	if (strlen(in_path_string) != in_path_string_size) {
		return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
	}

	subreq = smbd_smb2_tree_connect_send(req,
					     req->sconn->ev_ctx,
					     req,
					     in_path_string);
	if (subreq == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}
	tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);

	return smbd_smb2_request_pending_queue(req, subreq, 500);
}

static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
{
	struct smbd_smb2_request *req =
		tevent_req_callback_data(subreq,
		struct smbd_smb2_request);
	uint8_t *outhdr;
	DATA_BLOB outbody;
	uint8_t out_share_type = 0;
	uint32_t out_share_flags = 0;
	uint32_t out_capabilities = 0;
	uint32_t out_maximal_access = 0;
	uint32_t out_tree_id = 0;
	NTSTATUS status;
	NTSTATUS error;

	status = smbd_smb2_tree_connect_recv(subreq,
					     &out_share_type,
					     &out_share_flags,
					     &out_capabilities,
					     &out_maximal_access,
					     &out_tree_id);
	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->sconn,
							 nt_errstr(error));
			return;
		}
		return;
	}

	outhdr = SMBD_SMB2_OUT_HDR_PTR(req);

	outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
	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;
	}

	SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);

	SSVAL(outbody.data, 0x00, 0x10);	/* struct size */
	SCVAL(outbody.data, 0x02,
	      out_share_type);			/* share type */
	SCVAL(outbody.data, 0x03, 0);		/* reserved */
	SIVAL(outbody.data, 0x04,
	      out_share_flags);			/* share flags */
	SIVAL(outbody.data, 0x08,
	      out_capabilities);		/* capabilities */
	SIVAL(outbody.data, 0x0C,
	      out_maximal_access);		/* maximal access */

	error = smbd_smb2_request_done(req, outbody, NULL);
	if (!NT_STATUS_IS_OK(error)) {
		smbd_server_connection_terminate(req->sconn,
						 nt_errstr(error));
		return;
	}
}

static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
				       const char *in_path,
				       uint8_t *out_share_type,
				       uint32_t *out_share_flags,
				       uint32_t *out_capabilities,
				       uint32_t *out_maximal_access,
				       uint32_t *out_tree_id)
{
	struct smbXsrv_connection *conn = req->sconn->conn;
	const char *share = in_path;
	char *service = NULL;
	int snum = -1;
	struct smbXsrv_tcon *tcon;
	NTTIME now = timeval_to_nttime(&req->request_time);
	connection_struct *compat_conn = NULL;
	struct user_struct *compat_vuser = req->session->compat;
	NTSTATUS status;
	bool encryption_required = req->session->global->encryption_required;
	bool guest_session = false;

	if (strncmp(share, "\\\\", 2) == 0) {
		const char *p = strchr(share+2, '\\');
		if (p) {
			share = p + 1;
		}
	}

	DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
		  in_path, share));

	service = talloc_strdup(talloc_tos(), share);
	if(!service) {
		return NT_STATUS_NO_MEMORY;
	}

	strlower_m(service);

	/* TODO: do more things... */
	if (strequal(service,HOMES_NAME)) {
		if (compat_vuser->homes_snum == -1) {
			DEBUG(2, ("[homes] share not available for "
				"user %s because it was not found "
				"or created at session setup "
				"time\n",
				compat_vuser->session_info->unix_info->unix_name));
			return NT_STATUS_BAD_NETWORK_NAME;
		}
		snum = compat_vuser->homes_snum;
	} else if ((compat_vuser->homes_snum != -1)
                   && strequal(service,
			lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
		snum = compat_vuser->homes_snum;
	} else {
		snum = find_service(talloc_tos(), service, &service);
		if (!service) {
			return NT_STATUS_NO_MEMORY;
		}
	}

	if (snum < 0) {
		DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
			 service));
		return NT_STATUS_BAD_NETWORK_NAME;
	}

	if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
		encryption_required = true;
	}

	if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
		guest_session = true;
	}

	if (guest_session && encryption_required) {
		DEBUG(1,("reject guest as encryption is required for service %s\n",
			 service));
		return NT_STATUS_ACCESS_DENIED;
	}

	if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
		if (encryption_required) {
			DEBUG(1,("reject tcon with dialect[0x%04X] "
				 "as encryption is required for service %s\n",
				 conn->smb2.server.dialect, service));
			return NT_STATUS_ACCESS_DENIED;
		}
	}

	/* create a new tcon as child of the session */
	status = smb2srv_tcon_create(req->session, now, &tcon);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	tcon->global->encryption_required = encryption_required;

	compat_conn = make_connection_smb2(req->sconn,
					tcon, snum,
					req->session->compat,
					"???",
					&status);
	if (compat_conn == NULL) {
		TALLOC_FREE(tcon);
		return status;
	}

	tcon->global->share_name = lp_servicename(tcon->global,
						  SNUM(compat_conn));
	if (tcon->global->share_name == NULL) {
		conn_free(compat_conn);
		TALLOC_FREE(tcon);
		return NT_STATUS_NO_MEMORY;
	}

	tcon->compat = talloc_move(tcon, &compat_conn);

	tcon->status = NT_STATUS_OK;

	status = smbXsrv_tcon_update(tcon);
	if (!NT_STATUS_IS_OK(status)) {
		TALLOC_FREE(tcon);
		return status;
	}

	if (IS_PRINT(tcon->compat)) {
		*out_share_type = SMB2_SHARE_TYPE_PRINT;
	} else if (IS_IPC(tcon->compat)) {
		*out_share_type = SMB2_SHARE_TYPE_PIPE;
	} else {
		*out_share_type = SMB2_SHARE_TYPE_DISK;
	}

	*out_share_flags = 0;

	if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
		*out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
		*out_capabilities = SMB2_SHARE_CAP_DFS;
	} else {
		*out_capabilities = 0;
	}

	switch(lp_csc_policy(SNUM(tcon->compat))) {
	case CSC_POLICY_MANUAL:
		break;
	case CSC_POLICY_DOCUMENTS:
		*out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
		break;
	case CSC_POLICY_PROGRAMS:
		*out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
		break;
	case CSC_POLICY_DISABLE:
		*out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
		break;
	default:
		break;
	}

	if (lp_hideunreadable(SNUM(tcon->compat)) ||
	    lp_hideunwriteable_files(SNUM(tcon->compat))) {
		*out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
	}

	if (encryption_required) {
		*out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
	}

	*out_maximal_access = tcon->compat->share_access;

	*out_tree_id = tcon->global->tcon_wire_id;
	return NT_STATUS_OK;
}

struct smbd_smb2_tree_connect_state {
	const char *in_path;
	uint8_t out_share_type;
	uint32_t out_share_flags;
	uint32_t out_capabilities;
	uint32_t out_maximal_access;
	uint32_t out_tree_id;
};

static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
					struct tevent_context *ev,
					struct smbd_smb2_request *smb2req,
					const char *in_path)
{
	struct tevent_req *req;
	struct smbd_smb2_tree_connect_state *state;
	NTSTATUS status;

	req = tevent_req_create(mem_ctx, &state,
				struct smbd_smb2_tree_connect_state);
	if (req == NULL) {
		return NULL;
	}
	state->in_path = in_path;

	status = smbd_smb2_tree_connect(smb2req,
					state->in_path,
					&state->out_share_type,
					&state->out_share_flags,
					&state->out_capabilities,
					&state->out_maximal_access,
					&state->out_tree_id);
	if (tevent_req_nterror(req, status)) {
		return tevent_req_post(req, ev);
	}

	tevent_req_done(req);
	return tevent_req_post(req, ev);
}

static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
					    uint8_t *out_share_type,
					    uint32_t *out_share_flags,
					    uint32_t *out_capabilities,
					    uint32_t *out_maximal_access,
					    uint32_t *out_tree_id)
{
	struct smbd_smb2_tree_connect_state *state =
		tevent_req_data(req,
		struct smbd_smb2_tree_connect_state);
	NTSTATUS status;

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

	*out_share_type = state->out_share_type;
	*out_share_flags = state->out_share_flags;
	*out_capabilities = state->out_capabilities;
	*out_maximal_access = state->out_maximal_access;
	*out_tree_id = state->out_tree_id;

	tevent_req_received(req);
	return NT_STATUS_OK;
}

NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
{
	NTSTATUS status;
	DATA_BLOB outbody;

	status = smbd_smb2_request_verify_sizes(req, 0x04);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}

	/*
	 * TODO: cancel all outstanding requests on the tcon
	 */
	status = smbXsrv_tcon_disconnect(req->tcon, req->tcon->compat->vuid);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("smbd_smb2_request_process_tdis: "
			  "smbXsrv_tcon_disconnect() failed: %s\n",
			  nt_errstr(status)));
		/*
		 * If we hit this case, there is something completely
		 * wrong, so we better disconnect the transport connection.
		 */
		return status;
	}

	TALLOC_FREE(req->tcon);

	outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
	if (outbody.data == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}

	SSVAL(outbody.data, 0x00, 0x04);	/* struct size */
	SSVAL(outbody.data, 0x02, 0);		/* reserved */

	return smbd_smb2_request_done(req, outbody, NULL);
}