summaryrefslogtreecommitdiff
path: root/source4/librpc/rpc/dcerpc_smb.c
blob: f4e6b8c3dd3bb697a8c8ba7165c1008614c0f15c (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
/* 
   Unix SMB/CIFS implementation.

   dcerpc over SMB transport

   Copyright (C) Tim Potter 2003
   Copyright (C) Andrew Tridgell 2003
   
   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 "libcli/raw/libcliraw.h"
#include "libcli/composite/composite.h"
#include "librpc/rpc/dcerpc.h"
#include "librpc/rpc/dcerpc_proto.h"

/* transport private information used by SMB pipe transport */
struct smb_private {
	uint16_t fnum;
	struct smbcli_tree *tree;
	const char *server_name;
	bool dead;
};


/*
  tell the dcerpc layer that the transport is dead
*/
static void pipe_dead(struct dcerpc_connection *c, NTSTATUS status)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;

	if (smb->dead) {
		return;
	}

	smb->dead = true;

	if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
		status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
	}

	if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
		status = NT_STATUS_END_OF_FILE;
	}

	if (c->transport.recv_data) {
		c->transport.recv_data(c, NULL, status);
	}
}


/* 
   this holds the state of an in-flight call
*/
struct smb_read_state {
	struct dcerpc_connection *c;
	struct smbcli_request *req;
	size_t received;
	DATA_BLOB data;
	union smb_read *io;
};

/*
  called when a read request has completed
*/
static void smb_read_callback(struct smbcli_request *req)
{
	struct smb_private *smb;
	struct smb_read_state *state;
	union smb_read *io;
	uint16_t frag_length;
	NTSTATUS status;

	state = talloc_get_type(req->async.private_data, struct smb_read_state);
	smb = talloc_get_type(state->c->transport.private_data, struct smb_private);
	io = state->io;

	status = smb_raw_read_recv(state->req, io);
	if (NT_STATUS_IS_ERR(status)) {
		pipe_dead(state->c, status);
		talloc_free(state);
		return;
	}

	state->received += io->readx.out.nread;

	if (state->received < 16) {
		DEBUG(0,("dcerpc_smb: short packet (length %d) in read callback!\n",
			 (int)state->received));
		pipe_dead(state->c, NT_STATUS_INFO_LENGTH_MISMATCH);
		talloc_free(state);
		return;
	}

	frag_length = dcerpc_get_frag_length(&state->data);

	if (frag_length <= state->received) {
		DATA_BLOB data = state->data;
		struct dcerpc_connection *c = state->c;
		data.length = state->received;
		talloc_steal(state->c, data.data);
		talloc_free(state);
		c->transport.recv_data(c, &data, NT_STATUS_OK);
		return;
	}

	/* initiate another read request, as we only got part of a fragment */
	state->data.data = talloc_realloc(state, state->data.data, uint8_t, frag_length);

	io->readx.in.mincnt = MIN(state->c->srv_max_xmit_frag, 
				  frag_length - state->received);
	io->readx.in.maxcnt = io->readx.in.mincnt;
	io->readx.out.data = state->data.data + state->received;

	state->req = smb_raw_read_send(smb->tree, io);
	if (state->req == NULL) {
		pipe_dead(state->c, NT_STATUS_NO_MEMORY);
		talloc_free(state);
		return;
	}

	state->req->async.fn = smb_read_callback;
	state->req->async.private_data = state;
}

/*
  trigger a read request from the server, possibly with some initial
  data in the read buffer
*/
static NTSTATUS send_read_request_continue(struct dcerpc_connection *c, DATA_BLOB *blob)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;
	union smb_read *io;
	struct smb_read_state *state;
	struct smbcli_request *req;

	state = talloc(smb, struct smb_read_state);
	if (state == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	state->c = c;
	if (blob == NULL) {
		state->received = 0;
		state->data = data_blob_talloc(state, NULL, 0x2000);
	} else {
		uint32_t frag_length = blob->length>=16?
			dcerpc_get_frag_length(blob):0x2000;
		state->received = blob->length;
		state->data = data_blob_talloc(state, NULL, frag_length);
		if (!state->data.data) {
			talloc_free(state);
			return NT_STATUS_NO_MEMORY;
		}
		memcpy(state->data.data, blob->data, blob->length);
	}

	state->io = talloc(state, union smb_read);

	io = state->io;
	io->generic.level = RAW_READ_READX;
	io->readx.in.file.fnum = smb->fnum;
	io->readx.in.mincnt = state->data.length - state->received;
	io->readx.in.maxcnt = io->readx.in.mincnt;
	io->readx.in.offset = 0;
	io->readx.in.remaining = 0;
	io->readx.in.read_for_execute = false;
	io->readx.out.data = state->data.data + state->received;
	req = smb_raw_read_send(smb->tree, io);
	if (req == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	req->async.fn = smb_read_callback;
	req->async.private_data = state;

	state->req = req;

	return NT_STATUS_OK;
}


/*
  trigger a read request from the server
*/
static NTSTATUS send_read_request(struct dcerpc_connection *c)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;

	if (smb->dead) {
		return NT_STATUS_CONNECTION_DISCONNECTED;
	}

	return send_read_request_continue(c, NULL);
}

/* 
   this holds the state of an in-flight trans call
*/
struct smb_trans_state {
	struct dcerpc_connection *c;
	struct smbcli_request *req;
	struct smb_trans2 *trans;
};

/*
  called when a trans request has completed
*/
static void smb_trans_callback(struct smbcli_request *req)
{
	struct smb_trans_state *state = (struct smb_trans_state *)req->async.private_data;
	struct dcerpc_connection *c = state->c;
	NTSTATUS status;

	status = smb_raw_trans_recv(req, state, state->trans);

	if (NT_STATUS_IS_ERR(status)) {
		pipe_dead(c, status);
		return;
	}

	if (!NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
		DATA_BLOB data = state->trans->out.data;
		talloc_steal(c, data.data);
		talloc_free(state);
		c->transport.recv_data(c, &data, NT_STATUS_OK);
		return;
	}

	/* there is more to receive - setup a readx */
	send_read_request_continue(c, &state->trans->out.data);
	talloc_free(state);
}

/*
  send a SMBtrans style request
*/
static NTSTATUS smb_send_trans_request(struct dcerpc_connection *c, DATA_BLOB *blob)
{
        struct smb_private *smb = (struct smb_private *)c->transport.private_data;
        struct smb_trans2 *trans;
        uint16_t setup[2];
	struct smb_trans_state *state;
	uint16_t max_data;

	state = talloc(smb, struct smb_trans_state);
	if (state == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	state->c = c;
	state->trans = talloc(state, struct smb_trans2);
	trans = state->trans;

        trans->in.data = *blob;
        trans->in.params = data_blob(NULL, 0);
        
        setup[0] = TRANSACT_DCERPCCMD;
        setup[1] = smb->fnum;

	if (c->srv_max_xmit_frag > 0) {
	        max_data = MIN(UINT16_MAX, c->srv_max_xmit_frag);
	} else {
		max_data = UINT16_MAX;
	}

        trans->in.max_param = 0;
        trans->in.max_data = max_data;
        trans->in.max_setup = 0;
        trans->in.setup_count = 2;
        trans->in.flags = 0;
        trans->in.timeout = 0;
        trans->in.setup = setup;
        trans->in.trans_name = "\\PIPE\\";

        state->req = smb_raw_trans_send(smb->tree, trans);
	if (state->req == NULL) {
		talloc_free(state);
		return NT_STATUS_NO_MEMORY;
	}

	state->req->async.fn = smb_trans_callback;
	state->req->async.private_data = state;

	talloc_steal(state, state->req);

        return NT_STATUS_OK;
}

/*
  called when a write request has completed
*/
static void smb_write_callback(struct smbcli_request *req)
{
	struct dcerpc_connection *c = (struct dcerpc_connection *)req->async.private_data;

	if (!NT_STATUS_IS_OK(req->status)) {
		DEBUG(0,("dcerpc_smb: write callback error\n"));
		pipe_dead(c, req->status);
	}

	smbcli_request_destroy(req);
}

/* 
   send a packet to the server
*/
static NTSTATUS smb_send_request(struct dcerpc_connection *c, DATA_BLOB *blob, 
				 bool trigger_read)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;
	union smb_write io;
	struct smbcli_request *req;

	if (!smb || smb->dead) {
		return NT_STATUS_CONNECTION_DISCONNECTED;
	}

	if (trigger_read) {
		return smb_send_trans_request(c, blob);
	}

	io.generic.level = RAW_WRITE_WRITEX;
	io.writex.in.file.fnum = smb->fnum;
	io.writex.in.offset = 0;
	io.writex.in.wmode = PIPE_START_MESSAGE;
	io.writex.in.remaining = blob->length;
	io.writex.in.count = blob->length;
	io.writex.in.data = blob->data;

	/* we must not timeout at the smb level for rpc requests, as otherwise
	   signing/sealing can be messed up */
	smb->tree->session->transport->options.request_timeout = 0;

	req = smb_raw_write_send(smb->tree, &io);
	if (req == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	req->async.fn = smb_write_callback;
	req->async.private_data = c;

	if (trigger_read) {
		send_read_request(c);
	}

	return NT_STATUS_OK;
}


static void free_request(struct smbcli_request *req)
{
	talloc_free(req);
}

/* 
   shutdown SMB pipe connection
*/
static NTSTATUS smb_shutdown_pipe(struct dcerpc_connection *c, NTSTATUS status)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;
	union smb_close io;
	struct smbcli_request *req;

	/* maybe we're still starting up */
	if (!smb) return status;

	io.close.level = RAW_CLOSE_CLOSE;
	io.close.in.file.fnum = smb->fnum;
	io.close.in.write_time = 0;
	req = smb_raw_close_send(smb->tree, &io);
	if (req != NULL) {
		/* we don't care if this fails, so just free it if it succeeds */
		req->async.fn = free_request;
	}

	talloc_free(smb);
	c->transport.private_data = NULL;

	return status;
}

/*
  return SMB server name (called name)
*/
static const char *smb_peer_name(struct dcerpc_connection *c)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;
	if (smb == NULL) return "";
	return smb->server_name;
}

/*
  return remote name we make the actual connection (good for kerberos) 
*/
static const char *smb_target_hostname(struct dcerpc_connection *c)
{
	struct smb_private *smb = talloc_get_type(c->transport.private_data, struct smb_private);
	if (smb == NULL) return "";
	return smb->tree->session->transport->socket->hostname;
}

/*
  fetch the user session key 
*/
static NTSTATUS smb_session_key(struct dcerpc_connection *c, DATA_BLOB *session_key)
{
	struct smb_private *smb = (struct smb_private *)c->transport.private_data;

	if (smb == NULL) return NT_STATUS_CONNECTION_DISCONNECTED;
	if (smb->tree->session->user_session_key.data) {
		*session_key = smb->tree->session->user_session_key;
		return NT_STATUS_OK;
	}
	return NT_STATUS_NO_USER_SESSION_KEY;
}

struct pipe_open_smb_state {
	union smb_open *open;
	struct dcerpc_connection *c;
	struct smbcli_tree *tree;
	struct composite_context *ctx;
};

static void pipe_open_recv(struct smbcli_request *req);

struct composite_context *dcerpc_pipe_open_smb_send(struct dcerpc_pipe *p, 
						    struct smbcli_tree *tree,
						    const char *pipe_name)
{
	struct composite_context *ctx;
	struct pipe_open_smb_state *state;
	struct smbcli_request *req;
	struct dcerpc_connection *c = p->conn;

	/* if we don't have a binding on this pipe yet, then create one */
	if (p->binding == NULL) {
		NTSTATUS status;
		char *s;
		SMB_ASSERT(tree->session->transport->socket->hostname != NULL);
		s = talloc_asprintf(p, "ncacn_np:%s", tree->session->transport->socket->hostname);
		if (s == NULL) return NULL;
		status = dcerpc_parse_binding(p, s, &p->binding);
		talloc_free(s);
		if (!NT_STATUS_IS_OK(status)) {
			return NULL;
		}
	}

	ctx = composite_create(c, c->event_ctx);
	if (ctx == NULL) return NULL;

	state = talloc(ctx, struct pipe_open_smb_state);
	if (composite_nomem(state, ctx)) return ctx;
	ctx->private_data = state;

	state->c = c;
	state->tree = tree;
	state->ctx = ctx;

	state->open = talloc(state, union smb_open);
	if (composite_nomem(state->open, ctx)) return ctx;

	state->open->ntcreatex.level = RAW_OPEN_NTCREATEX;
	state->open->ntcreatex.in.flags = 0;
	state->open->ntcreatex.in.root_fid = 0;
	state->open->ntcreatex.in.access_mask = 
		SEC_STD_READ_CONTROL |
		SEC_FILE_WRITE_ATTRIBUTE |
		SEC_FILE_WRITE_EA |
		SEC_FILE_READ_DATA |
		SEC_FILE_WRITE_DATA;
	state->open->ntcreatex.in.file_attr = 0;
	state->open->ntcreatex.in.alloc_size = 0;
	state->open->ntcreatex.in.share_access = 
		NTCREATEX_SHARE_ACCESS_READ |
		NTCREATEX_SHARE_ACCESS_WRITE;
	state->open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
	state->open->ntcreatex.in.create_options = 0;
	state->open->ntcreatex.in.impersonation =
		NTCREATEX_IMPERSONATION_IMPERSONATION;
	state->open->ntcreatex.in.security_flags = 0;

	if ((strncasecmp(pipe_name, "/pipe/", 6) == 0) || 
	    (strncasecmp(pipe_name, "\\pipe\\", 6) == 0)) {
		pipe_name += 6;
	}
	state->open->ntcreatex.in.fname =
		(pipe_name[0] == '\\') ?
		talloc_strdup(state->open, pipe_name) :
		talloc_asprintf(state->open, "\\%s", pipe_name);
	if (composite_nomem(state->open->ntcreatex.in.fname, ctx)) return ctx;

	req = smb_raw_open_send(tree, state->open);
	composite_continue_smb(ctx, req, pipe_open_recv, state);
	return ctx;
}

static void pipe_open_recv(struct smbcli_request *req)
{
	struct pipe_open_smb_state *state = talloc_get_type(req->async.private_data,
					    struct pipe_open_smb_state);
	struct composite_context *ctx = state->ctx;
	struct dcerpc_connection *c = state->c;
	struct smb_private *smb;
	
	ctx->status = smb_raw_open_recv(req, state, state->open);
	if (!composite_is_ok(ctx)) return;

	/*
	  fill in the transport methods
	*/
	c->transport.transport       = NCACN_NP;
	c->transport.private_data    = NULL;
	c->transport.shutdown_pipe   = smb_shutdown_pipe;
	c->transport.peer_name       = smb_peer_name;
	c->transport.target_hostname = smb_target_hostname;

	c->transport.send_request    = smb_send_request;
	c->transport.send_read       = send_read_request;
	c->transport.recv_data       = NULL;
	
	/* Over-ride the default session key with the SMB session key */
	c->security_state.session_key = smb_session_key;

	smb = talloc(c, struct smb_private);
	if (composite_nomem(smb, ctx)) return;

	smb->fnum	= state->open->ntcreatex.out.file.fnum;
	smb->tree	= talloc_reference(smb, state->tree);
	smb->server_name= strupper_talloc(smb,
			  state->tree->session->transport->called.name);
	if (composite_nomem(smb->server_name, ctx)) return;
	smb->dead	= false;

	c->transport.private_data = smb;

	composite_done(ctx);
}

NTSTATUS dcerpc_pipe_open_smb_recv(struct composite_context *c)
{
	NTSTATUS status = composite_wait(c);
	talloc_free(c);
	return status;
}

_PUBLIC_ NTSTATUS dcerpc_pipe_open_smb(struct dcerpc_pipe *p,
			      struct smbcli_tree *tree,
			      const char *pipe_name)
{
	struct composite_context *ctx =	dcerpc_pipe_open_smb_send(p, tree,
								  pipe_name);
	return dcerpc_pipe_open_smb_recv(ctx);
}

/*
  return the SMB tree used for a dcerpc over SMB pipe
*/
_PUBLIC_ struct smbcli_tree *dcerpc_smb_tree(struct dcerpc_connection *c)
{
	struct smb_private *smb;

	if (c->transport.transport != NCACN_NP) return NULL;

	smb = talloc_get_type(c->transport.private_data, struct smb_private);
	if (!smb) return NULL;

	return smb->tree;
}

/*
  return the SMB fnum used for a dcerpc over SMB pipe (hack for torture operations)
*/
_PUBLIC_ uint16_t dcerpc_smb_fnum(struct dcerpc_connection *c)
{
	struct smb_private *smb;

	if (c->transport.transport != NCACN_NP) return 0;

	smb = talloc_get_type(c->transport.private_data, struct smb_private);
	if (!smb) return 0;

	return smb->fnum;
}