source4/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, 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                 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, smb_conn->lp_ctx);
  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(smb_conn->lp_ctx) < 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_data,
  92                                                              struct smbsrv_connection);
  93
  94         DEBUG(10,("smbsrv_recv\n"));
  95
  96         packet_recv(smb_conn->packet);
  97 }
  98
  99 /*
 100   called when a SMB socket becomes writable
 101 */
 102 static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
 103 {
 104         struct smbsrv_connection *smb_conn = talloc_get_type(conn->private_data,
 105                                                              struct smbsrv_connection);
 106         packet_queue_run(smb_conn->packet);
 107 }
 108
 109 /*
 110   handle socket recv errors
 111 */
 112 static void smbsrv_recv_error(void *private_data, NTSTATUS status)
 113 {
 114         struct smbsrv_connection *smb_conn = talloc_get_type(private_data, struct smbsrv_connection);
 115
 116         smbsrv_terminate_connection(smb_conn, nt_errstr(status));
 117 }
 118
 119 /*
 120   initialise a server_context from a open socket and register a event handler
 121   for reading from that socket
 122 */
 123 static void smbsrv_accept(struct stream_connection *conn)
 124 {
 125         struct smbsrv_connection *smb_conn;
 126
 127         DEBUG(5,("smbsrv_accept\n"));
 128
 129         smb_conn = talloc_zero(conn, struct smbsrv_connection);
 130         if (!smb_conn) {
 131                 stream_terminate_connection(conn, "out of memory");
 132                 return;
 133         }
 134
 135         smb_conn->packet = packet_init(smb_conn);
 136         if (!smb_conn->packet) {
 137                 smbsrv_terminate_connection(smb_conn, "out of memory");
 138                 return;
 139         }
 140         packet_set_private(smb_conn->packet, smb_conn);
 141         packet_set_socket(smb_conn->packet, conn->socket);
 142         packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
 143         packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
 144         packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
 145         packet_set_event_context(smb_conn->packet, conn->event.ctx);
 146         packet_set_fde(smb_conn->packet, conn->event.fde);
 147         packet_set_serialise(smb_conn->packet);
 148         packet_set_initial_read(smb_conn->packet, 4);
 149
 150         smb_conn->lp_ctx = conn->lp_ctx;
 151         smb_conn->connection = conn;
 152         conn->private_data = smb_conn;
 153
 154         smb_conn->statistics.connect_time = timeval_current();
 155
 156         smbsrv_management_init(smb_conn);
 157
 158         irpc_add_name(conn->msg_ctx, "smb_server");
 159
 160         if (!NT_STATUS_IS_OK(share_get_context_by_name(smb_conn, lp_share_backend(smb_conn->lp_ctx),
 161                                                        smb_conn->connection->event.ctx,
 162                                                        smb_conn->lp_ctx, &(smb_conn->share_context)))) {
 163                 smbsrv_terminate_connection(smb_conn, "share_init failed!");
 164                 return;
 165         }
 166 }
 167
 168 static const struct stream_server_ops smb_stream_ops = {
 169         .name                   = "smbsrv",
 170         .accept_connection      = smbsrv_accept,
 171         .recv_handler           = smbsrv_recv,
 172         .send_handler           = smbsrv_send,
 173 };
 174
 175 /*
 176   setup a listening socket on all the SMB ports for a particular address
 177 */
 178 _PUBLIC_ NTSTATUS smbsrv_add_socket(struct tevent_context *event_context,
 179                                     struct loadparm_context *lp_ctx,
 180                                const struct model_ops *model_ops,
 181                                const char *address)
 182 {
 183         const char **ports = lp_smb_ports(lp_ctx);
 184         int i;
 185         NTSTATUS status;
 186
 187         for (i=0;ports[i];i++) {
 188                 uint16_t port = atoi(ports[i]);
 189                 if (port == 0) continue;
 190                 status = stream_setup_socket(event_context, lp_ctx,
 191                                              model_ops, &smb_stream_ops,
 192                                              "ipv4", address, &port,
 193                                              lp_socket_options(lp_ctx),
 194                                              NULL);
 195                 NT_STATUS_NOT_OK_RETURN(status);
 196         }
 197
 198         return NT_STATUS_OK;
 199 }
 200
 201
 202 /*
 203   pre-open some of our ldb databases, to prevent an explosion of memory usage
 204   when we fork
 205  */
 206 static void smbsrv_preopen_ldb(struct task_server *task)
 207 {
 208         /* yes, this looks strange. It is a hack to preload the
 209            schema. I'd like to share most of the ldb context with the
 210            child too. That will come later */
 211         talloc_free(samdb_connect(task, task->event_ctx, task->lp_ctx, NULL));
 212 }
 213
 214 /*
 215   open the smb server sockets
 216 */
 217 static void smbsrv_task_init(struct task_server *task)
 218 {
 219         NTSTATUS status;
 220
 221         task_server_set_title(task, "task[smbsrv]");
 222
 223         if (lp_interfaces(task->lp_ctx) && lp_bind_interfaces_only(task->lp_ctx)) {
 224                 int num_interfaces;
 225                 int i;
 226                 struct interface *ifaces;
 227
 228                 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 229
 230                 num_interfaces = iface_count(ifaces);
 231
 232                 /* We have been given an interfaces line, and been
 233                    told to only bind to those interfaces. Create a
 234                    socket per interface and bind to only these.
 235                 */
 236                 for(i = 0; i < num_interfaces; i++) {
 237                         const char *address = iface_n_ip(ifaces, i);
 238                         status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops, address);
 239                         if (!NT_STATUS_IS_OK(status)) goto failed;
 240                 }
 241         } else {
 242                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
 243                 status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops,
 244                                            lp_socket_address(task->lp_ctx));
 245                 if (!NT_STATUS_IS_OK(status)) goto failed;
 246         }
 247
 248         smbsrv_preopen_ldb(task);
 249
 250         return;
 251 failed:
 252         task_server_terminate(task, "Failed to startup smb server task", true);
 253 }
 254
 255 /* called at smbd startup - register ourselves as a server service */
 256 NTSTATUS server_service_smb_init(void)
 257 {
 258         share_init();
 259         return register_server_service("smb", smbsrv_task_init);
 260 }