summaryrefslogtreecommitdiffstats
path: root/source3/libsmb/clientgen.c
blob: bec1184d53f2d0af2bfb634234507abc3f5aa27d (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
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
/*
   Unix SMB/CIFS implementation.
   SMB client generic functions
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Jeremy Allison 2007.

   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 "libsmb/libsmb.h"
#include "../lib/util/tevent_ntstatus.h"
#include "../libcli/smb/smb_signing.h"
#include "../libcli/smb/smb_seal.h"
#include "async_smb.h"
#include "../libcli/smb/smbXcli_base.h"
#include "../libcli/smb/smb2_negotiate_context.h"
#include "../librpc/ndr/libndr.h"
#include "../include/client.h"

/****************************************************************************
 Change the timeout (in milliseconds).
****************************************************************************/

unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
{
	unsigned int old_timeout = cli->timeout;
	DBG_DEBUG("Changing connection timeout for server '%s' from %d (ms) to "
		  "%d (ms).\n",
		  smbXcli_conn_remote_name(cli->conn),
		  cli->timeout,
		  timeout);
	cli->timeout = timeout;
	return old_timeout;
}

/****************************************************************************
 Set the 'backup_intent' flag.
****************************************************************************/

bool cli_set_backup_intent(struct cli_state *cli, bool flag)
{
	bool old_state = cli->backup_intent;
	cli->backup_intent = flag;
	return old_state;
}

/****************************************************************************
 Initialise a client structure. Always returns a talloc'ed struct.
 Set the signing state (used from the command line).
****************************************************************************/

struct GUID cli_state_client_guid;

struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
				   int fd,
				   const char *remote_name,
				   enum smb_signing_setting signing_state,
				   int flags)
{
	struct cli_state *cli = NULL;
	bool use_spnego = lp_client_use_spnego();
	bool force_dos_errors = false;
	bool force_ascii = false;
	bool use_level_II_oplocks = false;
	uint32_t smb1_capabilities = 0;
	uint32_t smb2_capabilities = 0;
	struct smb311_capabilities smb3_capabilities =
		smb311_capabilities_parse("client",
			lp_client_smb3_signing_algorithms(),
			lp_client_smb3_encryption_algorithms());
	struct GUID client_guid;

	if (!GUID_all_zero(&cli_state_client_guid)) {
		client_guid = cli_state_client_guid;
	} else {
		const char *str = NULL;

		str = lp_parm_const_string(-1, "libsmb", "client_guid", NULL);
		if (str != NULL) {
			GUID_from_string(str, &client_guid);
		} else {
			client_guid = GUID_random();
		}
	}

	/* Check the effective uid - make sure we are not setuid */
	if (is_setuid_root()) {
		DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
		return NULL;
	}

	cli = talloc_zero(mem_ctx, struct cli_state);
	if (!cli) {
		return NULL;
	}

	cli->server_domain = talloc_strdup(cli, "");
	if (!cli->server_domain) {
		goto error;
	}
	cli->server_os = talloc_strdup(cli, "");
	if (!cli->server_os) {
		goto error;
	}
	cli->server_type = talloc_strdup(cli, "");
	if (!cli->server_type) {
		goto error;
	}

	cli->raw_status = NT_STATUS_INTERNAL_ERROR;
	cli->map_dos_errors = true; /* remove this */
	cli->timeout = CLIENT_TIMEOUT;

	/* Set the CLI_FORCE_DOSERR environment variable to test
	   client routines using DOS errors instead of STATUS32
	   ones.  This intended only as a temporary hack. */
	if (getenv("CLI_FORCE_DOSERR")) {
		force_dos_errors = true;
	}
	if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
		force_dos_errors = true;
	}

	if (getenv("CLI_FORCE_ASCII")) {
		force_ascii = true;
	}
	if (!lp_unicode()) {
		force_ascii = true;
	}
	if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
		force_ascii = true;
	}

	if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
		use_spnego = false;
	}

	if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
		cli->use_oplocks = true;
	}
	if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
		use_level_II_oplocks = true;
	}

	if (signing_state == SMB_SIGNING_IPC_DEFAULT) {
		/*
		 * Ensure for IPC/RPC the default is to require
		 * signing unless explicitly turned off by the
		 * administrator.
		 */
		signing_state = lp_client_ipc_signing();
	}

	if (signing_state == SMB_SIGNING_DEFAULT) {
		signing_state = lp_client_signing();
	}

	smb1_capabilities = 0;
	smb1_capabilities |= CAP_LARGE_FILES;
	smb1_capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
	smb1_capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
	smb1_capabilities |= CAP_DFS | CAP_W2K_SMBS;
	smb1_capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
	smb1_capabilities |= CAP_LWIO;

	if (!force_dos_errors) {
		smb1_capabilities |= CAP_STATUS32;
	}

	if (!force_ascii) {
		smb1_capabilities |= CAP_UNICODE;
	}

	if (use_spnego) {
		smb1_capabilities |= CAP_EXTENDED_SECURITY;
	}

	if (use_level_II_oplocks) {
		smb1_capabilities |= CAP_LEVEL_II_OPLOCKS;
	}

	smb2_capabilities = SMB2_CAP_ALL;

	cli->conn = smbXcli_conn_create(cli, fd, remote_name,
					signing_state,
					smb1_capabilities,
					&client_guid,
					smb2_capabilities,
					&smb3_capabilities);
	if (cli->conn == NULL) {
		goto error;
	}

	cli->smb1.pid = (uint32_t)getpid();
	cli->smb1.vc_num = cli->smb1.pid;
	cli->smb1.session = smbXcli_session_create(cli, cli->conn);
	if (cli->smb1.session == NULL) {
		goto error;
	}

	cli->initialised = 1;
	return cli;

        /* Clean up after malloc() error */

 error:

	TALLOC_FREE(cli);
        return NULL;
}

/****************************************************************************
 Close all pipes open on this session.
****************************************************************************/

static void cli_nt_pipes_close(struct cli_state *cli)
{
	while (cli->pipe_list != NULL) {
		/*
		 * No TALLOC_FREE here!
		 */
		talloc_free(cli->pipe_list);
	}
}

/****************************************************************************
 Shutdown a client structure.
****************************************************************************/

static void _cli_shutdown(struct cli_state *cli)
{
	cli_nt_pipes_close(cli);

	/*
	 * tell our peer to free his resources.  Without this, when an
	 * application attempts to do a graceful shutdown and calls
	 * smbc_free_context() to clean up all connections, some connections
	 * can remain active on the peer end, until some (long) timeout period
	 * later.  This tree disconnect forces the peer to clean up, since the
	 * connection will be going away.
	 */
	if (cli_state_has_tcon(cli)) {
		cli_tdis(cli);
	}

	smbXcli_conn_disconnect(cli->conn, NT_STATUS_OK);

	TALLOC_FREE(cli);
}

void cli_shutdown(struct cli_state *cli)
{
	struct cli_state *cli_head;
	if (cli == NULL) {
		return;
	}
	DLIST_HEAD(cli, cli_head);
	if (cli_head == cli) {
		/*
		 * head of a DFS list, shutdown all subsidiary DFS
		 * connections.
		 */
		struct cli_state *p, *next;

		for (p = cli_head->next; p; p = next) {
			next = p->next;
			DLIST_REMOVE(cli_head, p);
			_cli_shutdown(p);
		}
	} else {
		DLIST_REMOVE(cli_head, cli);
	}

	_cli_shutdown(cli);
}

uint16_t cli_state_get_vc_num(struct cli_state *cli)
{
	return cli->smb1.vc_num;
}

/****************************************************************************
 Set the PID to use for smb messages. Return the old pid.
****************************************************************************/

uint32_t cli_setpid(struct cli_state *cli, uint32_t pid)
{
	uint32_t ret = cli->smb1.pid;
	cli->smb1.pid = pid;
	return ret;
}

uint32_t cli_getpid(struct cli_state *cli)
{
	return cli->smb1.pid;
}

bool cli_state_is_encryption_on(struct cli_state *cli)
{
	if (smbXcli_conn_protocol(cli->conn) < PROTOCOL_SMB2_02) {
		return smb1cli_conn_encryption_on(cli->conn);
	}

	if (cli->smb2.tcon == NULL) {
		return false;
	}

	return smb2cli_tcon_is_encryption_on(cli->smb2.tcon);
}

bool cli_state_has_tcon(struct cli_state *cli)
{
	uint32_t tid;
	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		if (cli->smb2.tcon == NULL) {
			return false;
		}
		tid = cli_state_get_tid(cli);
		if (tid == UINT32_MAX) {
			return false;
		}
	} else {
		if (cli->smb1.tcon == NULL) {
			return false;
		}
		tid = cli_state_get_tid(cli);
		if (tid == UINT16_MAX) {
			return false;
		}
	}
	return true;
}

uint32_t cli_state_get_tid(struct cli_state *cli)
{
	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		return smb2cli_tcon_current_id(cli->smb2.tcon);
	} else {
		return (uint32_t)smb1cli_tcon_current_id(cli->smb1.tcon);
	}
}

uint32_t cli_state_set_tid(struct cli_state *cli, uint32_t tid)
{
	uint32_t ret;
	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		ret = smb2cli_tcon_current_id(cli->smb2.tcon);
		smb2cli_tcon_set_id(cli->smb2.tcon, tid);
	} else {
		ret = smb1cli_tcon_current_id(cli->smb1.tcon);
		smb1cli_tcon_set_id(cli->smb1.tcon, tid);
	}
	return ret;
}

static struct smbXcli_tcon *cli_state_save_tcon(struct cli_state *cli)
{
	/*
	 * Note. This used to make a deep copy of either
	 * cli->smb2.tcon or cli->smb1.tcon, but this leaves
	 * the original pointer in place which will then get
	 * TALLOC_FREE()'d when the new connection is made on
	 * this cli_state.
	 *
	 * As there may be pipes open on the old connection with
	 * talloc'ed state allocated using the tcon pointer as a
	 * parent we can't deep copy and then free this as that
	 * closes the open pipes.
	 *
	 * This call is used to temporarily swap out a tcon pointer
	 * to allow a new tcon on the same cli_state.
	 *
	 * Just return the raw pointer and set the old value to NULL.
	 * We know we MUST be calling cli_state_restore_tcon() below
	 * to restore before closing the session.
	 *
	 * See BUG: https://bugzilla.samba.org/show_bug.cgi?id=13992
	 */
	struct smbXcli_tcon *tcon_ret = NULL;

	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		tcon_ret = cli->smb2.tcon;
		cli->smb2.tcon = NULL; /* *Not* TALLOC_FREE(). */
	} else {
		tcon_ret = cli->smb1.tcon;
		cli->smb1.tcon = NULL; /* *Not* TALLOC_FREE(). */
	}
	return tcon_ret;
}

void cli_state_save_tcon_share(struct cli_state *cli,
			       struct smbXcli_tcon **_tcon_ret,
			       char **_sharename_ret)
{
	*_tcon_ret = cli_state_save_tcon(cli);
	/*
	 * No talloc_copy as cli->share is already
	 * allocated off cli.
	 */
	*_sharename_ret = cli->share;
	cli->share = NULL;
}

static void cli_state_restore_tcon(struct cli_state *cli,
				   struct smbXcli_tcon *tcon)
{
	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		TALLOC_FREE(cli->smb2.tcon);
		cli->smb2.tcon = tcon;
	} else {
		TALLOC_FREE(cli->smb1.tcon);
		cli->smb1.tcon = tcon;
	}
}

void cli_state_restore_tcon_share(struct cli_state *cli,
				  struct smbXcli_tcon *tcon,
				  char *share)
{
	/* cli->share will have been replaced by a cli_tree_connect() call. */
	TALLOC_FREE(cli->share);
	cli->share = share;
	cli_state_restore_tcon(cli, tcon);
}

uint16_t cli_state_get_uid(struct cli_state *cli)
{
	return smb1cli_session_current_id(cli->smb1.session);
}

uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
{
	uint16_t ret = smb1cli_session_current_id(cli->smb1.session);
	smb1cli_session_set_id(cli->smb1.session, uid);
	return ret;
}

/****************************************************************************
 Set the case sensitivity flag on the packets. Returns old state.
****************************************************************************/

bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
{
	bool ret;
	uint32_t fs_attrs;
	struct smbXcli_tcon *tcon;

	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		tcon = cli->smb2.tcon;
	} else {
		tcon = cli->smb1.tcon;
	}

	fs_attrs = smbXcli_tcon_get_fs_attributes(tcon);
	if (fs_attrs & FILE_CASE_SENSITIVE_SEARCH) {
		ret = true;
	} else {
		ret = false;
	}
	if (case_sensitive) {
		fs_attrs |= FILE_CASE_SENSITIVE_SEARCH;
	} else {
		fs_attrs &= ~FILE_CASE_SENSITIVE_SEARCH;
	}
	smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);

	return ret;
}

uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
{
	uint32_t ret = smb1cli_conn_max_xmit(cli->conn);

	if (ofs >= ret) {
		return 0;
	}

	ret -= ofs;

	return ret;
}

time_t cli_state_server_time(struct cli_state *cli)
{
	NTTIME nt;
	time_t t;

	nt = smbXcli_conn_server_system_time(cli->conn);
	t = nt_time_to_unix(nt);

	return t;
}

struct cli_echo_state {
	uint8_t dummy;
};

static void cli_echo_done1(struct tevent_req *subreq);
static void cli_echo_done2(struct tevent_req *subreq);

struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
				 struct cli_state *cli, uint16_t num_echos,
				 DATA_BLOB data)
{
	struct tevent_req *req, *subreq;
	struct cli_echo_state *state;

	req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
	if (req == NULL) {
		return NULL;
	}

	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
		subreq = smb2cli_echo_send(
			state, ev, cli->conn, cli->timeout);
		if (tevent_req_nomem(subreq, req)) {
			return tevent_req_post(req, ev);
		}
		tevent_req_set_callback(subreq, cli_echo_done2, req);
		return req;
	}

	subreq = smb1cli_echo_send(
		state, ev, cli->conn, cli->timeout, num_echos, data);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, cli_echo_done1, req);

	return req;
}

static void cli_echo_done1(struct tevent_req *subreq)
{
	NTSTATUS status = smb1cli_echo_recv(subreq);
	return tevent_req_simple_finish_ntstatus(subreq, status);
}

static void cli_echo_done2(struct tevent_req *subreq)
{
	NTSTATUS status = smb2cli_echo_recv(subreq);
	return tevent_req_simple_finish_ntstatus(subreq, status);
}

/**
 * Get the result out from an echo request
 * @param[in] req	The async_req from cli_echo_send
 * @retval Did the server reply correctly?
 */

NTSTATUS cli_echo_recv(struct tevent_req *req)
{
	return tevent_req_simple_recv_ntstatus(req);
}

/**
 * @brief Send/Receive SMBEcho requests
 * @param[in] mem_ctx	The memory context to put the async_req on
 * @param[in] ev	The event context that will call us back
 * @param[in] cli	The connection to send the echo to
 * @param[in] num_echos	How many times do we want to get the reply?
 * @param[in] data	The data we want to get back
 * @retval Did the server reply correctly?
 */

NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct tevent_context *ev;
	struct tevent_req *req;
	NTSTATUS status = NT_STATUS_OK;

	if (smbXcli_conn_has_async_calls(cli->conn)) {
		/*
		 * Can't use sync call while an async call is in flight
		 */
		status = NT_STATUS_INVALID_PARAMETER;
		goto fail;
	}

	ev = samba_tevent_context_init(frame);
	if (ev == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	req = cli_echo_send(frame, ev, cli, num_echos, data);
	if (req == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
		goto fail;
	}

	status = cli_echo_recv(req);
 fail:
	TALLOC_FREE(frame);
	return status;
}

NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
		 uint8_t smb_command, uint8_t additional_flags,
		 uint8_t wct, uint16_t *vwv,
		 uint32_t num_bytes, const uint8_t *bytes,
		 struct tevent_req **result_parent,
		 uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
		 uint32_t *pnum_bytes, uint8_t **pbytes)
{
        struct tevent_context *ev;
        struct tevent_req *req = NULL;
        NTSTATUS status = NT_STATUS_NO_MEMORY;

        if (smbXcli_conn_has_async_calls(cli->conn)) {
                return NT_STATUS_INVALID_PARAMETER;
        }
        ev = samba_tevent_context_init(mem_ctx);
        if (ev == NULL) {
                goto fail;
        }
        req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags, 0,
			   wct, vwv, num_bytes, bytes);
        if (req == NULL) {
                goto fail;
        }
        if (!tevent_req_poll_ntstatus(req, ev, &status)) {
                goto fail;
        }
        status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
			      pnum_bytes, pbytes);
fail:
        TALLOC_FREE(ev);
	if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
		*result_parent = req;
	}
        return status;
}