summaryrefslogtreecommitdiff
path: root/source3/smbd/smb2_break.c
blob: 9899d92602aa67b4a60743edada8f677ab0fa6c8 (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
/*
   Unix SMB/CIFS implementation.
   Core SMB2 server

   Copyright (C) Stefan Metzmacher 2009
   Copyright (C) Jeremy Allison 2010

   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"

static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
						      struct tevent_context *ev,
						      struct smbd_smb2_request *smb2req,
						      uint8_t in_oplock_level,
						      uint64_t in_file_id_volatile);
static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
					    uint8_t *out_oplock_level);

static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_break(struct smbd_smb2_request *req)
{
	NTSTATUS status;
	const uint8_t *inbody;
	int i = req->current_idx;
	uint8_t in_oplock_level;
	uint64_t in_file_id_persistent;
	uint64_t in_file_id_volatile;
	struct tevent_req *subreq;

	status = smbd_smb2_request_verify_sizes(req, 0x18);
	if (!NT_STATUS_IS_OK(status)) {
		return smbd_smb2_request_error(req, status);
	}
	inbody = (const uint8_t *)req->in.vector[i+1].iov_base;

	in_oplock_level		= CVAL(inbody, 0x02);

	if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE &&
			in_oplock_level != SMB2_OPLOCK_LEVEL_II) {
		return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
	}

	/* 0x03 1 bytes reserved */
	/* 0x04 4 bytes reserved */
	in_file_id_persistent		= BVAL(inbody, 0x08);
	in_file_id_volatile		= BVAL(inbody, 0x10);

	if (req->compat_chain_fsp) {
		/* skip check */
	} else if (in_file_id_persistent != in_file_id_volatile) {
		return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
	}

	subreq = smbd_smb2_oplock_break_send(req,
					     req->sconn->smb2.event_ctx,
					     req,
					     in_oplock_level,
					     in_file_id_volatile);
	if (subreq == NULL) {
		return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
	}
	tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req);

	return smbd_smb2_request_pending_queue(req, subreq, 500);
}

static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq)
{
	struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
					struct smbd_smb2_request);
	const uint8_t *inbody;
	int i = req->current_idx;
	uint64_t in_file_id_persistent;
	uint64_t in_file_id_volatile;
	uint8_t out_oplock_level = 0;
	DATA_BLOB outbody;
	NTSTATUS status;
	NTSTATUS error; /* transport error */

	status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level);
	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;
	}

	inbody = (const uint8_t *)req->in.vector[i+1].iov_base;

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

	outbody = data_blob_talloc(req->out.vector, NULL, 0x18);
	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, 0x18);	/* struct size */
	SCVAL(outbody.data, 0x02,
	      out_oplock_level);		/* SMB2 oplock level */
	SCVAL(outbody.data, 0x03, 0);		/* reserved */
	SIVAL(outbody.data, 0x04, 0);		/* reserved */
	SBVAL(outbody.data, 0x08,
	      in_file_id_persistent);		/* file id (persistent) */
	SBVAL(outbody.data, 0x10,
	      in_file_id_volatile);		/* file id (volatile) */

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

struct smbd_smb2_oplock_break_state {
	struct smbd_smb2_request *smb2req;
	uint8_t out_oplock_level; /* SMB2 oplock level. */
};

static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
						      struct tevent_context *ev,
						      struct smbd_smb2_request *smb2req,
						      uint8_t in_oplock_level,
						      uint64_t in_file_id_volatile)
{
	struct tevent_req *req;
	struct smbd_smb2_oplock_break_state *state;
	struct smb_request *smbreq;
	connection_struct *conn = smb2req->tcon->compat_conn;
	files_struct *fsp = NULL;
	int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level);
	bool break_to_none = (oplocklevel == NO_OPLOCK);
	bool result;

	req = tevent_req_create(mem_ctx, &state,
				struct smbd_smb2_oplock_break_state);
	if (req == NULL) {
		return NULL;
	}
	state->smb2req = smb2req;
	state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;

	DEBUG(10,("smbd_smb2_oplock_break_send: file_id[0x%016llX] "
		"samba level %d\n",
		(unsigned long long)in_file_id_volatile,
		oplocklevel));

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

	fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
	if (fsp == NULL) {
		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
		return tevent_req_post(req, ev);
	}
	if (conn != fsp->conn) {
		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
		return tevent_req_post(req, ev);
	}
	if (smb2req->session->vuid != fsp->vuid) {
		tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
		return tevent_req_post(req, ev);
	}

	DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client "
		"for file %s fnum = %d\n",
		(unsigned int)in_oplock_level,
		fsp_str_dbg(fsp),
		fsp->fnum ));

	/* Are we awaiting a break message ? */
	if (fsp->oplock_timeout == NULL) {
		tevent_req_nterror(req, NT_STATUS_INVALID_OPLOCK_PROTOCOL);
		return tevent_req_post(req, ev);
	}

	if ((fsp->sent_oplock_break == BREAK_TO_NONE_SENT) ||
			(break_to_none)) {
		result = remove_oplock(fsp);
		state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
	} else {
		result = downgrade_oplock(fsp);
		state->out_oplock_level = SMB2_OPLOCK_LEVEL_II;
	}

	if (!result) {
		DEBUG(0, ("smbd_smb2_oplock_break_send: error in removing "
			"oplock on file %s\n", fsp_str_dbg(fsp)));
		/* Hmmm. Is this panic justified? */
		smb_panic("internal tdb error");
	}

	reply_to_oplock_break_requests(fsp);

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

static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
					    uint8_t *out_oplock_level)
{
	NTSTATUS status;
	struct smbd_smb2_oplock_break_state *state =
		tevent_req_data(req,
		struct smbd_smb2_oplock_break_state);

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

	*out_oplock_level = state->out_oplock_level;

	tevent_req_received(req);
	return NT_STATUS_OK;
}

/*********************************************************
 Create and send an asynchronous
 SMB2 OPLOCK_BREAK_NOTIFICATION.
*********************************************************/

void send_break_message_smb2(files_struct *fsp, int level)
{
	uint8_t smb2_oplock_level = (level == OPLOCKLEVEL_II) ?
				SMB2_OPLOCK_LEVEL_II :
				SMB2_OPLOCK_LEVEL_NONE;
	NTSTATUS status;

	DEBUG(10,("send_break_message_smb2: sending oplock break "
		"for file %s, fnum = %d, smb2 level %u\n",
		fsp_str_dbg(fsp),
		fsp->fnum,
		(unsigned int)smb2_oplock_level ));

	status = smbd_smb2_send_oplock_break(fsp->conn->sconn,
					(uint64_t)fsp->fnum,
					(uint64_t)fsp->fnum,
					smb2_oplock_level);
	if (!NT_STATUS_IS_OK(status)) {
		smbd_server_connection_terminate(fsp->conn->sconn,
				 nt_errstr(status));
	}
}