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                 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 */
  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 */
  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 */
 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 */
 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 */
 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 */
 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