1 /*
2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 2004-2005
5 Copyright (C) Stefan Metzmacher 2004-2005
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "smbd/service_task.h"
23 #include "smbd/service_stream.h"
24 #include "smbd/service.h"
25 #include "smb_server/smb_server.h"
26 #include "smb_server/service_smb_proto.h"
27 #include "lib/messaging/irpc.h"
28 #include "lib/stream/packet.h"
29 #include "libcli/smb2/smb2.h"
30 #include "smb_server/smb2/smb2_server.h"
31 #include "system/network.h"
32 #include "lib/socket/netif.h"
33 #include "param/share.h"
34 #include "dsdb/samdb/samdb.h"
35 #include "param/param.h"
36
smbsrv_recv_generic_request(void * private_data,DATA_BLOB blob)37 static NTSTATUS smbsrv_recv_generic_request(void *private_data, DATA_BLOB blob)
38 {
39 NTSTATUS status;
40 struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
41 uint32_t protocol_version;
42
43 /* see if its a special NBT packet */
44 if (CVAL(blob.data,0) != 0) {
45 status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
46 NT_STATUS_NOT_OK_RETURN(status);
47 return smbsrv_recv_smb_request(smb_conn, blob);
48 }
49
50 if (blob.length < (NBT_HDR_SIZE + MIN_SMB_SIZE)) {
51 DEBUG(2,("Invalid SMB packet length count %ld\n", (long)blob.length));
52 smbsrv_terminate_connection(smb_conn, "Invalid SMB packet");
53 return NT_STATUS_OK;
54 }
55
56 protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
57
58 switch (protocol_version) {
59 case SMB_MAGIC:
60 status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
61 NT_STATUS_NOT_OK_RETURN(status);
62 packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
63 return smbsrv_recv_smb_request(smb_conn, blob);
64 case SMB2_MAGIC:
65 if (lpcfg_server_max_protocol(smb_conn->lp_ctx) < PROTOCOL_SMB2_02) break;
66 status = smbsrv_init_smb2_connection(smb_conn);
67 NT_STATUS_NOT_OK_RETURN(status);
68 packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
69 return smbsrv_recv_smb2_request(smb_conn, blob);
70 }
71
72 DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n", protocol_version));
73 smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
74 return NT_STATUS_OK;
75 }
76
77 /*
78 close the socket and shutdown a server_context
79 */
smbsrv_terminate_connection(struct smbsrv_connection * smb_conn,const char * reason)80 void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
81 {
82 stream_terminate_connection(smb_conn->connection, reason);
83 }
84
85 /*
86 called when a SMB socket becomes readable
87 */
smbsrv_recv(struct stream_connection * conn,uint16_t flags)88 static void smbsrv_recv(struct stream_connection *conn, uint16_t flags)
89 {
90 struct smbsrv_connection *smb_conn = talloc_get_type(conn->private_data,
91 struct smbsrv_connection);
92
93 DEBUG(10,("smbsrv_recv\n"));
94
95 packet_recv(smb_conn->packet);
96 }
97
98 /*
99 called when a SMB socket becomes writable
100 */
smbsrv_send(struct stream_connection * conn,uint16_t flags)101 static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
102 {
103 struct smbsrv_connection *smb_conn = talloc_get_type(conn->private_data,
104 struct smbsrv_connection);
105 packet_queue_run(smb_conn->packet);
106 }
107
108 /*
109 handle socket recv errors
110 */
smbsrv_recv_error(void * private_data,NTSTATUS status)111 static void smbsrv_recv_error(void *private_data, NTSTATUS status)
112 {
113 struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
114
115 smbsrv_terminate_connection(smb_conn, nt_errstr(status));
116 }
117
118 /*
119 initialise a server_context from a open socket and register a event handler
120 for reading from that socket
121 */
smbsrv_accept(struct stream_connection * conn)122 static void smbsrv_accept(struct stream_connection *conn)
123 {
124 struct smbsrv_connection *smb_conn;
125
126 DEBUG(5,("smbsrv_accept\n"));
127
128 smb_conn = talloc_zero(conn, struct smbsrv_connection);
129 if (!smb_conn) {
130 stream_terminate_connection(conn, "out of memory");
131 return;
132 }
133
134 smb_conn->packet = packet_init(smb_conn);
135 if (!smb_conn->packet) {
136 smbsrv_terminate_connection(smb_conn, "out of memory");
137 return;
138 }
139 packet_set_private(smb_conn->packet, smb_conn);
140 packet_set_socket(smb_conn->packet, conn->socket);
141 packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
142 packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
143 packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
144 packet_set_event_context(smb_conn->packet, conn->event.ctx);
145 packet_set_fde(smb_conn->packet, conn->event.fde);
146 packet_set_serialise(smb_conn->packet);
147 packet_set_initial_read(smb_conn->packet, 4);
148
149 smb_conn->lp_ctx = conn->lp_ctx;
150 smb_conn->connection = conn;
151 conn->private_data = smb_conn;
152
153 smb_conn->statistics.connect_time = timeval_current();
154
155 smbsrv_management_init(smb_conn);
156
157 irpc_add_name(conn->msg_ctx, "smb_server");
158
159 if (!NT_STATUS_IS_OK(share_get_context_by_name(smb_conn, lpcfg_share_backend(smb_conn->lp_ctx),
160 smb_conn->connection->event.ctx,
161 smb_conn->lp_ctx, &(smb_conn->share_context)))) {
162 smbsrv_terminate_connection(smb_conn, "share_init failed!");
163 return;
164 }
165 }
166
167 static const struct stream_server_ops smb_stream_ops = {
168 .name = "smbsrv",
169 .accept_connection = smbsrv_accept,
170 .recv_handler = smbsrv_recv,
171 .send_handler = smbsrv_send,
172 };
173
174 /*
175 setup a listening socket on all the SMB ports for a particular address
176 */
smbsrv_add_socket(TALLOC_CTX * mem_ctx,struct tevent_context * event_context,struct loadparm_context * lp_ctx,const struct model_ops * model_ops,const char * address,void * process_context)177 _PUBLIC_ NTSTATUS smbsrv_add_socket(TALLOC_CTX *mem_ctx,
178 struct tevent_context *event_context,
179 struct loadparm_context *lp_ctx,
180 const struct model_ops *model_ops,
181 const char *address,
182 void *process_context)
183 {
184 const char **ports = lpcfg_smb_ports(lp_ctx);
185 int i;
186 NTSTATUS status;
187
188 for (i=0;ports[i];i++) {
189 uint16_t port = atoi(ports[i]);
190 if (port == 0) continue;
191 status = stream_setup_socket(mem_ctx, event_context, lp_ctx,
192 model_ops, &smb_stream_ops,
193 "ip", address, &port,
194 lpcfg_socket_options(lp_ctx),
195 NULL, process_context);
196 NT_STATUS_NOT_OK_RETURN(status);
197 }
198
199 return NT_STATUS_OK;
200 }
201
202
203
204