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1 /*
2 Unix SMB2 implementation.
3
4 Copyright (C) Stefan Metzmacher 2005
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /* the context for a single SMB2 request. This is passed to any request-context
21 functions */
22 struct smb2srv_request {
23 /* the smbsrv_connection needs a list of requests queued for send */
24 struct smb2srv_request *next, *prev;
25
26 /* the server_context contains all context specific to this SMB socket */
27 struct smbsrv_connection *smb_conn;
28
29 /* conn is only set for operations that have a valid TID */
30 struct smbsrv_tcon *tcon;
31
32 /* the session context is derived from the vuid */
33 struct smbsrv_session *session;
34
35 #define SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY (1<<0)
36 uint32_t control_flags;
37
38 /* the system time when the request arrived */
39 struct timeval request_time;
40
41 /* a pointer to the per request union smb_* io structure */
42 void *io_ptr;
43
44 /* the ntvfs_request */
45 struct ntvfs_request *ntvfs;
46
47 /* Now the SMB2 specific stuff */
48
49 /* the status the backend returned */
50 NTSTATUS status;
51
52 /* for matching request and reply */
53 uint64_t seqnum;
54
55 /* the id that can be used to cancel the request */
56 uint32_t pending_id;
57
58 /* the offset to the next SMB2 Header for chained requests */
59 uint32_t chain_offset;
60
61 /* chained file handle */
62 uint8_t _chained_file_handle[16];
63 uint8_t *chained_file_handle;
64
65 bool is_signed;
66
67 struct smb2_request_buffer in;
68 struct smb2_request_buffer out;
69 };
70
71 struct smbsrv_request;
72
73 #include "smb_server/smb2/smb2_proto.h"
74
75 /* useful way of catching field size errors with file and line number */
76 #define SMB2SRV_CHECK_BODY_SIZE(req, size, dynamic) do { \
77 size_t is_size = req->in.body_size; \
78 uint16_t field_size; \
79 uint16_t want_size = ((dynamic)?(size)+1:(size)); \
80 if (is_size < (size)) { \
81 DEBUG(0,("%s: buffer too small 0x%x. Expected 0x%x\n", \
82 __location__, (unsigned)is_size, (unsigned)want_size)); \
83 smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER); \
84 return; \
85 }\
86 field_size = SVAL(req->in.body, 0); \
87 if (field_size != want_size) { \
88 DEBUG(0,("%s: unexpected fixed body size 0x%x. Expected 0x%x\n", \
89 __location__, (unsigned)field_size, (unsigned)want_size)); \
90 smb2srv_send_error(req, NT_STATUS_INVALID_PARAMETER); \
91 return; \
92 } \
93 } while (0)
94
95 #define SMB2SRV_CHECK(cmd) do {\
96 NTSTATUS _status; \
97 _status = cmd; \
98 if (!NT_STATUS_IS_OK(_status)) { \
99 smb2srv_send_error(req, _status); \
100 return; \
101 } \
102 } while (0)
103
104 /* useful wrapper for talloc with NO_MEMORY reply */
105 #define SMB2SRV_TALLOC_IO_PTR(ptr, type) do { \
106 ptr = talloc(req, type); \
107 if (!ptr) { \
108 smb2srv_send_error(req, NT_STATUS_NO_MEMORY); \
109 return; \
110 } \
111 req->io_ptr = ptr; \
112 } while (0)
113
114 #define SMB2SRV_SETUP_NTVFS_REQUEST(send_fn, state) do { \
115 req->ntvfs = ntvfs_request_create(req->tcon->ntvfs, req, \
116 req->session->session_info,\
117 0, \
118 req->request_time, \
119 req, send_fn, state); \
120 if (!req->ntvfs) { \
121 smb2srv_send_error(req, NT_STATUS_NO_MEMORY); \
122 return; \
123 } \
124 (void)talloc_steal(req->tcon->ntvfs, req); \
125 req->ntvfs->frontend_data.private_data = req; \
126 } while (0)
127
128 #define SMB2SRV_CHECK_FILE_HANDLE(handle) do { \
129 if (!handle) { \
130 smb2srv_send_error(req, NT_STATUS_FILE_CLOSED); \
131 return; \
132 } \
133 } while (0)
134
135 /*
136 check if the backend wants to handle the request asynchronously.
137 if it wants it handled synchronously then call the send function
138 immediately
139 */
140 #define SMB2SRV_CALL_NTVFS_BACKEND(cmd) do { \
141 req->ntvfs->async_states->status = cmd; \
142 if (req->ntvfs->async_states->state & NTVFS_ASYNC_STATE_ASYNC) { \
143 NTSTATUS _status; \
144 _status = smb2srv_queue_pending(req); \
145 if (!NT_STATUS_IS_OK(_status)) { \
146 ntvfs_cancel(req->ntvfs); \
147 } \
148 } else { \
149 req->ntvfs->async_states->send_fn(req->ntvfs); \
150 } \
151 } while (0)
152
153 /* check req->ntvfs->async_states->status and if not OK then send an error reply */
154 #define SMB2SRV_CHECK_ASYNC_STATUS_ERR_SIMPLE do { \
155 req = talloc_get_type(ntvfs->async_states->private_data, struct smb2srv_request); \
156 if (ntvfs->async_states->state & NTVFS_ASYNC_STATE_CLOSE || NT_STATUS_EQUAL(ntvfs->async_states->status, NT_STATUS_NET_WRITE_FAULT)) { \
157 smbsrv_terminate_connection(req->smb_conn, get_friendly_nt_error_msg (ntvfs->async_states->status)); \
158 talloc_free(req); \
159 return; \
160 } \
161 req->status = ntvfs->async_states->status; \
162 if (NT_STATUS_IS_ERR(ntvfs->async_states->status)) { \
163 smb2srv_send_error(req, ntvfs->async_states->status); \
164 return; \
165 } \
166 } while (0)
167 #define SMB2SRV_CHECK_ASYNC_STATUS_ERR(ptr, type) do { \
168 SMB2SRV_CHECK_ASYNC_STATUS_ERR_SIMPLE; \
169 ptr = talloc_get_type(req->io_ptr, type); \
170 } while (0)
171 #define SMB2SRV_CHECK_ASYNC_STATUS_SIMPLE do { \
172 req = talloc_get_type(ntvfs->async_states->private_data, struct smb2srv_request); \
173 if (ntvfs->async_states->state & NTVFS_ASYNC_STATE_CLOSE || NT_STATUS_EQUAL(ntvfs->async_states->status, NT_STATUS_NET_WRITE_FAULT)) { \
174 smbsrv_terminate_connection(req->smb_conn, get_friendly_nt_error_msg (ntvfs->async_states->status)); \
175 talloc_free(req); \
176 return; \
177 } \
178 req->status = ntvfs->async_states->status; \
179 if (!NT_STATUS_IS_OK(ntvfs->async_states->status)) { \
180 smb2srv_send_error(req, ntvfs->async_states->status); \
181 return; \
182 } \
183 } while (0)
184 #define SMB2SRV_CHECK_ASYNC_STATUS(ptr, type) do { \
185 SMB2SRV_CHECK_ASYNC_STATUS_SIMPLE; \
186 ptr = talloc_get_type(req->io_ptr, type); \
187 } while (0)