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
|
/*
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
struct smb2_options {
uint32_t timeout;
};
/*
information returned from the negotiate response
*/
struct smb2_negotiate {
DATA_BLOB secblob;
};
/* this is the context for the smb2 transport layer */
struct smb2_transport {
/* socket level info */
struct smbcli_socket *socket;
struct smb2_options options;
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;
};
/*
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;
};
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;
};
/*
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;
} async;
};
#define SMB2_MIN_SIZE 0x42
/* offsets into header elements */
#define SMB2_HDR_LENGTH 0x04
#define SMB2_HDR_PAD1 0x06
#define SMB2_HDR_STATUS 0x08
#define SMB2_HDR_OPCODE 0x0c
#define SMB2_HDR_UNKNOWN1 0x0e
#define SMB2_HDR_FLAGS 0x10
#define SMB2_HDR_CHAIN_OFFSET 0x14
#define SMB2_HDR_SEQNUM 0x18
#define SMB2_HDR_PID 0x20
#define SMB2_HDR_TID 0x24
#define SMB2_HDR_UID 0x28 /* 64 bit */
#define SMB2_HDR_SIG 0x30 /* guess ... */
#define SMB2_HDR_BODY 0x40
/* 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' */
/*
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)
|
