source/smb_server/smb_server.c

   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
  37 static NTSTATUS smbsrv_recv_generic_request(void *private, DATA_BLOB blob)
  38 {
  39         NTSTATUS status;
  40         struct smbsrv_connection *smb_conn = talloc_get_type(private, 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);
  46                 NT_STATUS_NOT_OK_RETURN(status);
  47                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
  48                 return smbsrv_recv_smb_request(smb_conn, blob);
  49         }
  50
  51         if (blob.length < (NBT_HDR_SIZE + MIN_SMB_SIZE)) {
  52                 DEBUG(2,("Invalid SMB packet length count %ld\n", (long)blob.length));
  53                 smbsrv_terminate_connection(smb_conn, "Invalid SMB packet");
  54                 return NT_STATUS_OK;
  55         }
  56
  57         protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
  58
  59         switch (protocol_version) {
  60         case SMB_MAGIC:
  61                 status = smbsrv_init_smb_connection(smb_conn);
  62                 NT_STATUS_NOT_OK_RETURN(status);
  63                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
  64                 return smbsrv_recv_smb_request(smb_conn, blob);
  65         case SMB2_MAGIC:
  66                 if (lp_srv_maxprotocol(global_loadparm) < PROTOCOL_SMB2) break;
  67                 status = smbsrv_init_smb2_connection(smb_conn);
  68                 NT_STATUS_NOT_OK_RETURN(status);
  69                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
  70                 return smbsrv_recv_smb2_request(smb_conn, blob);
  71         }
  72
  73         DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n", protocol_version));
  74         smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
  75         return NT_STATUS_OK;
  76 }
  77
  78 /*
  79   close the socket and shutdown a server_context
  80 */
  81 void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
  82 {
  83         stream_terminate_connection(smb_conn->connection, reason);
  84 }
  85
  86 /*
  87   called when a SMB socket becomes readable
  88 */
  89 static void smbsrv_recv(struct stream_connection *conn, uint16_t flags)
  90 {
  91         struct smbsrv_connection *smb_conn = talloc_get_type(conn->private,
  92                                                              struct smbsrv_connection);
  93
  94         DEBUG(10,("smbsrv_recv\n"));
  95
  96         packet_recv(smb_conn->packet);
  97
  98         /* free up temporary memory */
  99         lp_talloc_free();
 100 }
 101
 102 /*
 103   called when a SMB socket becomes writable
 104 */
 105 static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
 106 {
 107         struct smbsrv_connection *smb_conn = talloc_get_type(conn->private,
 108                                                              struct smbsrv_connection);
 109         packet_queue_run(smb_conn->packet);
 110 }
 111
 112 /*
 113   handle socket recv errors
 114 */
 115 static void smbsrv_recv_error(void *private, NTSTATUS status)
 116 {
 117         struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
 118
 119         smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 120 }
 121
 122 /*
 123   initialise a server_context from a open socket and register a event handler
 124   for reading from that socket
 125 */
 126 static void smbsrv_accept(struct stream_connection *conn)
 127 {
 128         struct smbsrv_connection *smb_conn;
 129
 130         DEBUG(5,("smbsrv_accept\n"));
 131
 132         smb_conn = talloc_zero(conn, struct smbsrv_connection);
 133         if (!smb_conn) {
 134                 stream_terminate_connection(conn, "out of memory");
 135                 return;
 136         }
 137
 138         smb_conn->packet = packet_init(smb_conn);
 139         if (!smb_conn->packet) {
 140                 smbsrv_terminate_connection(smb_conn, "out of memory");
 141                 return;
 142         }
 143         packet_set_private(smb_conn->packet, smb_conn);
 144         packet_set_socket(smb_conn->packet, conn->socket);
 145         packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
 146         packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
 147         packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
 148         packet_set_event_context(smb_conn->packet, conn->event.ctx);
 149         packet_set_fde(smb_conn->packet, conn->event.fde);
 150         packet_set_serialise(smb_conn->packet);
 151
 152         smb_conn->connection = conn;
 153         conn->private = smb_conn;
 154
 155         irpc_add_name(conn->msg_ctx, "smb_server");
 156
 157         smb_conn->statistics.connect_time = timeval_current();
 158
 159         smbsrv_management_init(smb_conn);
 160
 161         if (!NT_STATUS_IS_OK(share_get_context(smb_conn, &(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 */
 177 _PUBLIC_ NTSTATUS smbsrv_add_socket(struct event_context *event_context,
 178                                const struct model_ops *model_ops,
 179                                const char *address)
 180 {
 181         const char **ports = lp_smb_ports(global_loadparm);
 182         int i;
 183         NTSTATUS status;
 184
 185         for (i=0;ports[i];i++) {
 186                 uint16_t port = atoi(ports[i]);
 187                 if (port == 0) continue;
 188                 status = stream_setup_socket(event_context, model_ops, &smb_stream_ops,
 189                                              "ipv4", address, &port, NULL);
 190                 NT_STATUS_NOT_OK_RETURN(status);
 191         }
 192
 193         return NT_STATUS_OK;
 194 }
 195
 196
 197 /*
 198   pre-open some of our ldb databases, to prevent an explosion of memory usage
 199   when we fork
 200  */
 201 static void smbsrv_preopen_ldb(struct task_server *task)
 202 {
 203         /* yes, this looks strange. It is a hack to preload the
 204            schema. I'd like to share most of the ldb context with the
 205            child too. That will come later */
 206         talloc_free(samdb_connect(task, global_loadparm, NULL));
 207 }
 208
 209 /*
 210   open the smb server sockets
 211 */
 212 static void smbsrv_task_init(struct task_server *task)
 213 {
 214         NTSTATUS status;
 215
 216         task_server_set_title(task, "task[smbsrv]");
 217
 218         if (lp_interfaces(global_loadparm) && lp_bind_interfaces_only(global_loadparm)) {
 219                 int num_interfaces = iface_count();
 220                 int i;
 221
 222                 /* We have been given an interfaces line, and been
 223                    told to only bind to those interfaces. Create a
 224                    socket per interface and bind to only these.
 225                 */
 226                 for(i = 0; i < num_interfaces; i++) {
 227                         const char *address = iface_n_ip(i);
 228                         status = smbsrv_add_socket(task->event_ctx, task->model_ops, address);
 229                         if (!NT_STATUS_IS_OK(status)) goto failed;
 230                 }
 231         } else {
 232                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
 233                 status = smbsrv_add_socket(task->event_ctx, task->model_ops,
 234                                            lp_socket_address(global_loadparm));
 235                 if (!NT_STATUS_IS_OK(status)) goto failed;
 236         }
 237
 238         smbsrv_preopen_ldb(task);
 239
 240         return;
 241 failed:
 242         task_server_terminate(task, "Failed to startup smb server task");
 243 }
 244
 245 /*
 246   called on startup of the smb server service It's job is to start
 247   listening on all configured sockets
 248 */
 249 static NTSTATUS smbsrv_init(struct event_context *event_context,
 250                             const struct model_ops *model_ops)
 251 {
 252         return task_server_startup(event_context, model_ops, smbsrv_task_init);
 253 }
 254
 255 /* called at smbd startup - register ourselves as a server service */
 256 NTSTATUS server_service_smb_init(void)
 257 {
 258         return register_server_service("smb", smbsrv_init);
 259 }