summaryrefslogtreecommitdiff
path: root/source4/libcli/smb2/smb2.h
blob: 5d6341a15bde1c9ebaa106eb42acc1a053a3ec5e (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
/* 
   Unix SMB/CIFS implementation.

   SMB2 client library header

   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/>.
*/

#ifndef __LIBCLI_SMB2_SMB2_H__
#define __LIBCLI_SMB2_SMB2_H__

#include "libcli/raw/request.h"
#include "libcli/raw/libcliraw.h"

struct smb2_handle;

/*
  information returned from the negotiate process
*/
struct smb2_negotiate {
	DATA_BLOB secblob;
	NTTIME system_time;
	NTTIME server_start_time;
	uint16_t security_mode;
};

/* this is the context for the smb2 transport layer */
struct smb2_transport {
	/* socket level info */
	struct smbcli_socket *socket;

	struct smb2_negotiate negotiate;

	/* next seqnum to allocate */
	uint64_t seqnum;

	/* a list of requests that are pending for receive on this
	   connection */
	struct smb2_request *pending_recv;

	/* context of the stream -> packet parser */
	struct packet_context *packet;

	/* an idle function - if this is defined then it will be
	   called once every period microseconds while we are waiting
	   for a packet */
	struct {
		void (*func)(struct smb2_transport *, void *);
		void *private;
		uint_t period;
	} idle;

	struct {
		/* a oplock break request handler */
		bool (*handler)(struct smb2_transport *transport,
				const struct smb2_handle *handle,
				uint8_t level, void *private_data);
		/* private data passed to the oplock handler */
		void *private_data;
	} oplock;

	struct smbcli_options options;

	bool signing_required;
};


/*
  SMB2 tree context
*/
struct smb2_tree {
	struct smb2_session *session;
	uint32_t tid;
};

/*
  SMB2 session context
*/
struct smb2_session {
	struct smb2_transport *transport;
	struct gensec_security *gensec;
	uint64_t uid;
	DATA_BLOB session_key;
	bool signing_active;
};


struct smb2_request_buffer {
	/* the raw SMB2 buffer, including the 4 byte length header */
	uint8_t *buffer;
	
	/* the size of the raw buffer, including 4 byte header */
	size_t size;
	
	/* how much has been allocated - on reply the buffer is over-allocated to 
	   prevent too many realloc() calls 
	*/
	size_t allocated;
	
	/* the start of the SMB2 header - this is always buffer+4 */
	uint8_t *hdr;
	
	/* the packet body */
	uint8_t *body;
	size_t body_fixed;
	size_t body_size;

	/* this point to the next dynamic byte that can be used
	 * this will be moved when some dynamic data is pushed
	 */
	uint8_t *dynamic;

	/* this is used to range check and align strings and buffers */
	struct request_bufinfo bufinfo;
};


/*
  a client request moves between the following 4 states.
*/
enum smb2_request_state {SMB2_REQUEST_INIT, /* we are creating the request */
			SMB2_REQUEST_RECV, /* we are waiting for a matching reply */
			SMB2_REQUEST_DONE, /* the request is finished */
			SMB2_REQUEST_ERROR}; /* a packet or transport level error has occurred */

/* the context for a single SMB2 request */
struct smb2_request {
	/* allow a request to be part of a list of requests */
	struct smb2_request *next, *prev;

	/* each request is in one of 3 possible states */
	enum smb2_request_state state;
	
	struct smb2_transport *transport;
	struct smb2_session   *session;
	struct smb2_tree      *tree;

	uint64_t seqnum;

	struct {
		bool do_cancel;
		bool can_cancel;
		uint32_t pending_id;
	} cancel;

	/* the NT status for this request. Set by packet receive code
	   or code detecting error. */
	NTSTATUS status;
	
	struct smb2_request_buffer in;
	struct smb2_request_buffer out;

	/* information on what to do with a reply when it is received
	   asyncronously. If this is not setup when a reply is received then
	   the reply is discarded

	   The private pointer is private to the caller of the client
	   library (the application), not private to the library
	*/
	struct {
		void (*fn)(struct smb2_request *);
		void *private_data;
	} async;
};


#define SMB2_MIN_SIZE 0x42

/* offsets into header elements for a sync SMB2 request */
#define SMB2_HDR_PROTOCOL_ID    0x00
#define SMB2_HDR_LENGTH		0x04
#define SMB2_HDR_EPOCH		0x06
#define SMB2_HDR_STATUS		0x08
#define SMB2_HDR_OPCODE		0x0c
#define SMB2_HDR_CREDIT 	0x0e
#define SMB2_HDR_FLAGS		0x10
#define SMB2_HDR_NEXT_COMMAND	0x14
#define SMB2_HDR_MESSAGE_ID     0x18
#define SMB2_HDR_PID		0x20
#define SMB2_HDR_TID		0x24
#define SMB2_HDR_SESSION_ID	0x28
#define SMB2_HDR_SIGNATURE	0x30 /* 16 bytes */
#define SMB2_HDR_BODY		0x40

/* header flags */
#define SMB2_HDR_FLAG_REDIRECT  0x01
#define SMB2_HDR_FLAG_ASYNC     0x02
#define SMB2_HDR_FLAG_CHAINED   0x04
#define SMB2_HDR_FLAG_SIGNED    0x08
#define SMB2_HDR_FLAG_DFS       0x10000000

/* SMB2 opcodes */
#define SMB2_OP_NEGPROT   0x00
#define SMB2_OP_SESSSETUP 0x01
#define SMB2_OP_LOGOFF    0x02
#define SMB2_OP_TCON      0x03
#define SMB2_OP_TDIS      0x04
#define SMB2_OP_CREATE    0x05
#define SMB2_OP_CLOSE     0x06
#define SMB2_OP_FLUSH     0x07
#define SMB2_OP_READ      0x08
#define SMB2_OP_WRITE     0x09
#define SMB2_OP_LOCK      0x0a
#define SMB2_OP_IOCTL     0x0b
#define SMB2_OP_CANCEL    0x0c
#define SMB2_OP_KEEPALIVE 0x0d
#define SMB2_OP_FIND      0x0e
#define SMB2_OP_NOTIFY    0x0f
#define SMB2_OP_GETINFO   0x10
#define SMB2_OP_SETINFO   0x11
#define SMB2_OP_BREAK     0x12

#define SMB2_MAGIC 0x424D53FE /* 0xFE 'S' 'M' 'B' */

/* the dialect we support */
#define SMB2_DIALECT_REVISION           0x202

/* SMB2 negotiate security_mode */
#define SMB2_NEGOTIATE_SIGNING_ENABLED   0x01
#define SMB2_NEGOTIATE_SIGNING_REQUIRED  0x02

/* SMB2 capabilities - only 1 so far. I'm sure more will be added */
#define SMB2_CAP_DFS                     0x0
/* so we can spot new caps as added */
#define SMB2_CAP_ALL                     SMB2_CAP_DFS 

/* SMB2 share flags */
#define SMB2_SHAREFLAG_MANUAL_CACHING                    0x0000
#define SMB2_SHAREFLAG_AUTO_CACHING                      0x0010
#define SMB2_SHAREFLAG_VDO_CACHING                       0x0020
#define SMB2_SHAREFLAG_NO_CACHING                        0x0030
#define SMB2_SHAREFLAG_DFS                               0x0001
#define SMB2_SHAREFLAG_DFS_ROOT                          0x0002
#define SMB2_SHAREFLAG_RESTRICT_EXCLUSIVE_OPENS          0x0100
#define SMB2_SHAREFLAG_FORCE_SHARED_DELETE               0x0200
#define SMB2_SHAREFLAG_ALLOW_NAMESPACE_CACHING           0x0400
#define SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM       0x0800
#define SMB2_SHAREFLAG_ALL                               0x0F33

/* SMB2 create security flags */
#define SMB2_SECURITY_DYNAMIC_TRACKING                   0x01
#define SMB2_SECURITY_EFFECTIVE_ONLY                     0x02

/* SMB2 requested oplock levels */
#define SMB2_OPLOCK_LEVEL_NONE                           0x00
#define SMB2_OPLOCK_LEVEL_II                             0x01
#define SMB2_OPLOCK_LEVEL_EXCLUSIVE                      0x08
#define SMB2_OPLOCK_LEVEL_BATCH                          0x09

/* SMB2 impersonation levels */
#define SMB2_IMPERSONATION_ANONYMOUS                     0x00
#define SMB2_IMPERSONATION_IDENTIFICATION                0x01
#define SMB2_IMPERSONATION_IMPERSONATION                 0x02
#define SMB2_IMPERSONATION_DELEGATE                      0x03

/* SMB2 create tags */
#define SMB2_CREATE_TAG_EXTA "ExtA"
#define SMB2_CREATE_TAG_MXAC "MxAc"
#define SMB2_CREATE_TAG_SECD "SecD"
#define SMB2_CREATE_TAG_DHNQ "DHnQ"
#define SMB2_CREATE_TAG_DHNC "DHnC"
#define SMB2_CREATE_TAG_ALSI "AlSi"
#define SMB2_CREATE_TAG_TWRP "TWrp"
#define SMB2_CREATE_TAG_QFID "QFid"



/*
  check that a body has the expected size
*/
#define SMB2_CHECK_PACKET_RECV(req, size, dynamic) do { \
	size_t is_size = req->in.body_size; \
	uint16_t field_size = SVAL(req->in.body, 0); \
	uint16_t want_size = ((dynamic)?(size)+1:(size)); \
	if (is_size < (size)) { \
		DEBUG(0,("%s: buffer too small 0x%x. Expected 0x%x\n", \
			 __location__, (unsigned)is_size, (unsigned)want_size)); \
		return NT_STATUS_BUFFER_TOO_SMALL; \
	}\
	if (field_size != want_size) { \
		DEBUG(0,("%s: unexpected fixed body size 0x%x. Expected 0x%x\n", \
			 __location__, (unsigned)field_size, (unsigned)want_size)); \
		return NT_STATUS_INVALID_PARAMETER; \
	} \
} while (0)

#endif