summaryrefslogtreecommitdiff
path: root/source4/libcli/smb_composite/connect.c
blob: e0f4919f0b24372b8bd0461d6bf651fdf15cf574 (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
/* 
   Unix SMB/CIFS implementation.

   Copyright (C) Andrew Tridgell 2005
   
   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/>.
*/
/*
  a composite API for making a full SMB connection
*/

#include "includes.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/raw/raw_proto.h"
#include "libcli/composite/composite.h"
#include "libcli/smb_composite/smb_composite.h"
#include "lib/events/events.h"
#include "libcli/resolve/resolve.h"
#include "auth/credentials/credentials.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"

/* the stages of this call */
enum connect_stage {CONNECT_RESOLVE, 
		    CONNECT_SOCKET, 
		    CONNECT_SESSION_REQUEST,
		    CONNECT_NEGPROT,
		    CONNECT_SESSION_SETUP,
		    CONNECT_SESSION_SETUP_ANON,
		    CONNECT_TCON,
		    CONNECT_DONE
};

struct connect_state {
	enum connect_stage stage;
	struct smbcli_socket *sock;
	struct smbcli_transport *transport;
	struct smbcli_session *session;
	struct smb_composite_connect *io;
	union smb_tcon *io_tcon;
	struct smb_composite_sesssetup *io_setup;
	struct smbcli_request *req;
	struct composite_context *creq;
};


static void request_handler(struct smbcli_request *);
static void composite_handler(struct composite_context *);

/*
  a tree connect request has completed
*/
static NTSTATUS connect_tcon(struct composite_context *c, 
			     struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;

	status = smb_raw_tcon_recv(state->req, c, state->io_tcon);
	NT_STATUS_NOT_OK_RETURN(status);

	io->out.tree->tid = state->io_tcon->tconx.out.tid;
	if (state->io_tcon->tconx.out.dev_type) {
		io->out.tree->device = talloc_strdup(io->out.tree, 
						     state->io_tcon->tconx.out.dev_type);
	}
	if (state->io_tcon->tconx.out.fs_type) {
		io->out.tree->fs_type = talloc_strdup(io->out.tree, 
						      state->io_tcon->tconx.out.fs_type);
	}

	state->stage = CONNECT_DONE;

	return NT_STATUS_OK;
}


/*
  a session setup request with anonymous fallback has completed
*/
static NTSTATUS connect_session_setup_anon(struct composite_context *c, 
					   struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;

	status = smb_composite_sesssetup_recv(state->creq);
	NT_STATUS_NOT_OK_RETURN(status);

	io->out.anonymous_fallback_done = true;
	
	state->session->vuid = state->io_setup->out.vuid;
	
	/* setup for a tconx */
	state->io_tcon = talloc(c, union smb_tcon);
	NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);

	/* connect to a share using a tree connect */
	state->io_tcon->generic.level = RAW_TCON_TCONX;
	state->io_tcon->tconx.in.flags = 0;
	state->io_tcon->tconx.in.password = data_blob(NULL, 0);	
	
	state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon, 
						 "\\\\%s\\%s", 
						 io->in.called_name, 
						 io->in.service);
	NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
	if (!io->in.service_type) {
		state->io_tcon->tconx.in.device = "?????";
	} else {
		state->io_tcon->tconx.in.device = io->in.service_type;
	}

	state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
	NT_STATUS_HAVE_NO_MEMORY(state->req);
	if (state->req->state == SMBCLI_REQUEST_ERROR) {
		return state->req->status;
	}

	state->req->async.fn = request_handler;
	state->req->async.private = c;
	state->stage = CONNECT_TCON;

	return NT_STATUS_OK;
}

/*
  a session setup request has completed
*/
static NTSTATUS connect_session_setup(struct composite_context *c, 
				      struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;

	status = smb_composite_sesssetup_recv(state->creq);

	if (!NT_STATUS_IS_OK(status) &&
	    !cli_credentials_is_anonymous(state->io->in.credentials) &&
	    io->in.fallback_to_anonymous) {

		state->io_setup->in.credentials = cli_credentials_init(state);
		NT_STATUS_HAVE_NO_MEMORY(state->io_setup->in.credentials);
		cli_credentials_set_workstation(state->io_setup->in.credentials,
		   cli_credentials_get_workstation(state->io->in.credentials), 
		   CRED_SPECIFIED);
		cli_credentials_set_anonymous(state->io_setup->in.credentials);

		/* If the preceding attempt was with extended security, we
		 * have been given a uid in the NTLMSSP_CHALLENGE reply. This
		 * would lead to an invalid uid in the anonymous fallback */
		state->session->vuid = 0;
		data_blob_free(&state->session->user_session_key);
		talloc_free(state->session->gensec);
		state->session->gensec = NULL;

		state->creq = smb_composite_sesssetup_send(state->session,
							   state->io_setup);
		NT_STATUS_HAVE_NO_MEMORY(state->creq);
		if (state->creq->state == COMPOSITE_STATE_ERROR) {
			return state->creq->status;
		}
		state->creq->async.fn = composite_handler;
		state->creq->async.private_data = c;
		state->stage = CONNECT_SESSION_SETUP_ANON;

		return NT_STATUS_OK;
	}

	NT_STATUS_NOT_OK_RETURN(status);
	
	state->session->vuid = state->io_setup->out.vuid;
	
	/* If we don't have a remote share name then this indicates that
	 * we don't want to do a tree connect */
	if (!io->in.service) {
		state->stage = CONNECT_DONE;
		return NT_STATUS_OK;
	}

	state->io_tcon = talloc(c, union smb_tcon);
	NT_STATUS_HAVE_NO_MEMORY(state->io_tcon);

	/* connect to a share using a tree connect */
	state->io_tcon->generic.level = RAW_TCON_TCONX;
	state->io_tcon->tconx.in.flags = 0;
	state->io_tcon->tconx.in.password = data_blob(NULL, 0);	
	
	state->io_tcon->tconx.in.path = talloc_asprintf(state->io_tcon, 
						 "\\\\%s\\%s", 
						 io->in.called_name, 
						 io->in.service);
	NT_STATUS_HAVE_NO_MEMORY(state->io_tcon->tconx.in.path);
	if (!io->in.service_type) {
		state->io_tcon->tconx.in.device = "?????";
	} else {
		state->io_tcon->tconx.in.device = io->in.service_type;
	}

	state->req = smb_raw_tcon_send(io->out.tree, state->io_tcon);
	NT_STATUS_HAVE_NO_MEMORY(state->req);
	if (state->req->state == SMBCLI_REQUEST_ERROR) {
		return state->req->status;
	}

	state->req->async.fn = request_handler;
	state->req->async.private = c;
	state->stage = CONNECT_TCON;

	return NT_STATUS_OK;
}

/*
  a negprot request has completed
*/
static NTSTATUS connect_negprot(struct composite_context *c, 
				struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;

	status = smb_raw_negotiate_recv(state->req);
	NT_STATUS_NOT_OK_RETURN(status);

	/* next step is a session setup */
	state->session = smbcli_session_init(state->transport, state, true, io->in.session_options);
	NT_STATUS_HAVE_NO_MEMORY(state->session);
	
	/* setup for a tconx (or at least have the structure ready to
	 * return, if we won't go that far) */
	io->out.tree = smbcli_tree_init(state->session, state, true);
	NT_STATUS_HAVE_NO_MEMORY(io->out.tree);

	/* If we don't have any credentials then this indicates that
	 * we don't want to do a session setup */
	if (!io->in.credentials) {
		state->stage = CONNECT_DONE;
		return NT_STATUS_OK;
	}

	state->io_setup = talloc(c, struct smb_composite_sesssetup);
	NT_STATUS_HAVE_NO_MEMORY(state->io_setup);

	/* prepare a session setup to establish a security context */
	state->io_setup->in.sesskey      = state->transport->negotiate.sesskey;
	state->io_setup->in.capabilities = state->transport->negotiate.capabilities;
	state->io_setup->in.credentials  = io->in.credentials;
	state->io_setup->in.workgroup    = io->in.workgroup;
	state->io_setup->in.gensec_settings = io->in.gensec_settings;

	state->creq = smb_composite_sesssetup_send(state->session, state->io_setup);
	NT_STATUS_HAVE_NO_MEMORY(state->creq);
	if (state->creq->state == COMPOSITE_STATE_ERROR) {
		return state->creq->status;
	}

	state->creq->async.fn = composite_handler;
	state->creq->async.private_data = c;

	state->stage = CONNECT_SESSION_SETUP;
	
	return NT_STATUS_OK;
}

/*
  setup a negprot send 
*/
static NTSTATUS connect_send_negprot(struct composite_context *c, 
				     struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);

	state->req = smb_raw_negotiate_send(state->transport, io->in.options.unicode, io->in.options.max_protocol);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	state->req->async.fn = request_handler;
	state->req->async.private = c;
	state->stage = CONNECT_NEGPROT;
	
	return NT_STATUS_OK;
}


/*
  a session request operation has completed
*/
static NTSTATUS connect_session_request(struct composite_context *c, 
					struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;

	status = smbcli_transport_connect_recv(state->req);
	NT_STATUS_NOT_OK_RETURN(status);

	/* next step is a negprot */
	return connect_send_negprot(c, io);
}

/*
  a socket connection operation has completed
*/
static NTSTATUS connect_socket(struct composite_context *c, 
			       struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;
	struct nbt_name calling, called;

	status = smbcli_sock_connect_recv(state->creq, state, &state->sock);
	NT_STATUS_NOT_OK_RETURN(status);

	/* the socket is up - we can initialise the smbcli transport layer */
	state->transport = smbcli_transport_init(state->sock, state, true, 
						 &io->in.options, io->in.iconv_convenience);
	NT_STATUS_HAVE_NO_MEMORY(state->transport);

	if (is_ipaddress(state->sock->hostname) &&
	    (state->io->in.called_name != NULL)) {
		/* If connecting to an IP address, we might want the real name
		 * of the host for later kerberos. The called name is a better
		 * approximation */
		state->sock->hostname =
			talloc_strdup(state->sock, io->in.called_name);
		NT_STATUS_HAVE_NO_MEMORY(state->sock->hostname);
	}

	make_nbt_name_client(&calling, cli_credentials_get_workstation(io->in.credentials));

	nbt_choose_called_name(state, &called, io->in.called_name, NBT_NAME_SERVER);

	/* we have a connected socket - next step is a session
	   request, if needed. Port 445 doesn't need it, so it goes
	   straight to the negprot */
	if (state->sock->port == 445) {
		status = nbt_name_dup(state->transport, &called, 
				      &state->transport->called);
		NT_STATUS_NOT_OK_RETURN(status);
		return connect_send_negprot(c, io);
	}

	state->req = smbcli_transport_connect_send(state->transport, &calling, &called);
	NT_STATUS_HAVE_NO_MEMORY(state->req);

	state->req->async.fn = request_handler;
	state->req->async.private = c;
	state->stage = CONNECT_SESSION_REQUEST;

	return NT_STATUS_OK;
}


/*
  called when name resolution is finished
*/
static NTSTATUS connect_resolve(struct composite_context *c, 
				struct smb_composite_connect *io)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
	NTSTATUS status;
	const char *address;

	status = resolve_name_recv(state->creq, state, &address);
	NT_STATUS_NOT_OK_RETURN(status);

	state->creq = smbcli_sock_connect_send(state, address, 
					       io->in.dest_ports,
					       io->in.dest_host, 
					       NULL, c->event_ctx, 
						  io->in.socket_options);
	NT_STATUS_HAVE_NO_MEMORY(state->creq);

	state->stage = CONNECT_SOCKET;
	state->creq->async.private_data = c;
	state->creq->async.fn = composite_handler;

	return NT_STATUS_OK;
}


/*
  handle and dispatch state transitions
*/
static void state_handler(struct composite_context *c)
{
	struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);

	switch (state->stage) {
	case CONNECT_RESOLVE:
		c->status = connect_resolve(c, state->io);
		break;
	case CONNECT_SOCKET:
		c->status = connect_socket(c, state->io);
		break;
	case CONNECT_SESSION_REQUEST:
		c->status = connect_session_request(c, state->io);
		break;
	case CONNECT_NEGPROT:
		c->status = connect_negprot(c, state->io);
		break;
	case CONNECT_SESSION_SETUP:
		c->status = connect_session_setup(c, state->io);
		break;
	case CONNECT_SESSION_SETUP_ANON:
		c->status = connect_session_setup_anon(c, state->io);
		break;
	case CONNECT_TCON:
		c->status = connect_tcon(c, state->io);
		break;
	}

	if (state->stage == CONNECT_DONE) {
		/* all done! */
		composite_done(c);
	} else {
		composite_is_ok(c);
	}
}


/*
  handler for completion of a smbcli_request sub-request
*/
static void request_handler(struct smbcli_request *req)
{
	struct composite_context *c = talloc_get_type(req->async.private, 
						     struct composite_context);
	state_handler(c);
}

/*
  handler for completion of a smbcli_composite sub-request
*/
static void composite_handler(struct composite_context *creq)
{
	struct composite_context *c = talloc_get_type(creq->async.private_data, 
						     struct composite_context);
	state_handler(c);
}

/*
  a function to establish a smbcli_tree from scratch
*/
struct composite_context *smb_composite_connect_send(struct smb_composite_connect *io,
						     TALLOC_CTX *mem_ctx,
						     struct resolve_context *resolve_ctx,
						     struct tevent_context *event_ctx)
{
	struct composite_context *c;
	struct connect_state *state;
	struct nbt_name name;

	c = talloc_zero(mem_ctx, struct composite_context);
	if (c == NULL) goto failed;

	c->event_ctx = talloc_reference(c, event_ctx);
	if (c->event_ctx == NULL) goto failed;

	state = talloc_zero(c, struct connect_state);
	if (state == NULL) goto failed;

	if (io->in.gensec_settings == NULL) goto failed;
	state->io = io;

	c->state = COMPOSITE_STATE_IN_PROGRESS;
	c->private_data = state;

	state->stage = CONNECT_RESOLVE;
	make_nbt_name_server(&name, io->in.dest_host);
	state->creq = resolve_name_send(resolve_ctx, &name, c->event_ctx);

	if (state->creq == NULL) goto failed;
	state->creq->async.private_data = c;
	state->creq->async.fn = composite_handler;

	return c;
failed:
	talloc_free(c);
	return NULL;
}

/*
  recv half of async composite connect code
*/
NTSTATUS smb_composite_connect_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
{
	NTSTATUS status;

	status = composite_wait(c);

	if (NT_STATUS_IS_OK(status)) {
		struct connect_state *state = talloc_get_type(c->private_data, struct connect_state);
		talloc_steal(mem_ctx, state->io->out.tree);
	}

	talloc_free(c);
	return status;
}

/*
  sync version of smb_composite_connect 
*/
NTSTATUS smb_composite_connect(struct smb_composite_connect *io, TALLOC_CTX *mem_ctx,
			       struct resolve_context *resolve_ctx,
			       struct tevent_context *ev)
{
	struct composite_context *c = smb_composite_connect_send(io, mem_ctx, resolve_ctx, ev);
	return smb_composite_connect_recv(c, mem_ctx);
}