source/winbind/wb_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main winbindd server routines
   4
   5    Copyright (C) Stefan Metzmacher      2005
   6    Copyright (C) Andrew Tridgell        2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/socket/socket.h"
  25 #include "dlinklist.h"
  26 #include "lib/events/events.h"
  27 #include "smbd/service_task.h"
  28 #include "smbd/process_model.h"
  29 #include "smbd/service_stream.h"
  30 #include "nsswitch/winbind_nss_config.h"
  31 #include "winbind/wb_server.h"
  32 #include "lib/stream/packet.h"
  33 #include "smbd/service.h"
  34 #include "passdb/secrets.h"
  35
  36 void wbsrv_terminate_connection(struct wbsrv_connection *wbconn, const char *reason)
  37 {
  38         stream_terminate_connection(wbconn->conn, reason);
  39 }
  40
  41 /*
  42   called on a tcp recv error
  43 */
  44 static void wbsrv_recv_error(void *private, NTSTATUS status)
  45 {
  46         struct wbsrv_connection *wbconn = talloc_get_type(private, struct wbsrv_connection);
  47         wbsrv_terminate_connection(wbconn, nt_errstr(status));
  48 }
  49
  50 static void wbsrv_accept(struct stream_connection *conn)
  51 {
  52         struct wbsrv_listen_socket *listen_socket = talloc_get_type(conn->private,
  53                                                                     struct wbsrv_listen_socket);
  54         struct wbsrv_connection *wbconn;
  55
  56         wbconn = talloc_zero(conn, struct wbsrv_connection);
  57         if (!wbconn) {
  58                 stream_terminate_connection(conn, "wbsrv_accept: out of memory");
  59                 return;
  60         }
  61         wbconn->conn          = conn;
  62         wbconn->listen_socket = listen_socket;
  63         conn->private         = wbconn;
  64
  65         wbconn->packet = packet_init(wbconn);
  66         if (wbconn->packet == NULL) {
  67                 wbsrv_terminate_connection(wbconn, "wbsrv_accept: out of memory");
  68                 return;
  69         }
  70         packet_set_private(wbconn->packet, wbconn);
  71         packet_set_socket(wbconn->packet, conn->socket);
  72         packet_set_callback(wbconn->packet, wbsrv_samba3_process);
  73         packet_set_full_request(wbconn->packet, wbsrv_samba3_packet_full_request);
  74         packet_set_error_handler(wbconn->packet, wbsrv_recv_error);
  75         packet_set_event_context(wbconn->packet, conn->event.ctx);
  76         packet_set_fde(wbconn->packet, conn->event.fde);
  77         packet_set_serialise(wbconn->packet);
  78 }
  79
  80 /*
  81   receive some data on a winbind connection
  82 */
  83 static void wbsrv_recv(struct stream_connection *conn, uint16_t flags)
  84 {
  85         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  86                                                           struct wbsrv_connection);
  87         packet_recv(wbconn->packet);
  88
  89 }
  90
  91 /*
  92   called when we can write to a connection
  93 */
  94 static void wbsrv_send(struct stream_connection *conn, uint16_t flags)
  95 {
  96         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  97                                                           struct wbsrv_connection);
  98         packet_queue_run(wbconn->packet);
  99 }
 100
 101 static const struct stream_server_ops wbsrv_ops = {
 102         .name                   = "winbind samba3 protocol",
 103         .accept_connection      = wbsrv_accept,
 104         .recv_handler           = wbsrv_recv,
 105         .send_handler           = wbsrv_send
 106 };
 107
 108 /*
 109   startup the winbind task
 110 */
 111 static void winbind_task_init(struct task_server *task)
 112 {
 113         uint16_t port = 1;
 114         const struct model_ops *model_ops;
 115         NTSTATUS status;
 116         struct wbsrv_service *service;
 117         struct wbsrv_listen_socket *listen_socket;
 118
 119         /* within the winbind task we want to be a single process, so
 120            ask for the single process model ops and pass these to the
 121            stream_setup_socket() call. */
 122         model_ops = process_model_byname("single");
 123         if (!model_ops) {
 124                 task_server_terminate(task,
 125                                       "Can't find 'single' process model_ops");
 126                 return;
 127         }
 128
 129         /* Make sure the directory for the Samba3 socket exists, and is of the correct permissions */
 130         if (!directory_create_or_exist(lp_winbindd_socket_directory(), geteuid(), 0755)) {
 131                 task_server_terminate(task,
 132                                       "Cannot create winbindd pipe directory");
 133                 return;
 134         }
 135
 136         service = talloc_zero(task, struct wbsrv_service);
 137         if (!service) goto nomem;
 138         service->task   = task;
 139
 140         service->primary_sid = secrets_get_domain_sid(service,
 141                                                       lp_workgroup());
 142         if (service->primary_sid == NULL) {
 143                 task_server_terminate(
 144                         task, nt_errstr(NT_STATUS_CANT_ACCESS_DOMAIN_INFO));
 145                 return;
 146         }
 147
 148         /* setup the unprivileged samba3 socket */
 149         listen_socket = talloc(service, struct wbsrv_listen_socket);
 150         if (!listen_socket) goto nomem;
 151         listen_socket->socket_path      = talloc_asprintf(listen_socket, "%s/%s",
 152                                                           lp_winbindd_socket_directory(),
 153                                                           WINBINDD_SAMBA3_SOCKET);
 154         if (!listen_socket->socket_path) goto nomem;
 155         listen_socket->service          = service;
 156         listen_socket->privileged       = False;
 157         status = stream_setup_socket(task->event_ctx, model_ops,
 158                                      &wbsrv_ops, "unix",
 159                                      listen_socket->socket_path, &port,
 160                                      listen_socket);
 161         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 162
 163         /* setup the privileged samba3 socket */
 164         listen_socket = talloc(service, struct wbsrv_listen_socket);
 165         if (!listen_socket) goto nomem;
 166         listen_socket->socket_path      =
 167                 smbd_tmp_path(listen_socket,
 168                               WINBINDD_SAMBA3_PRIVILEGED_SOCKET);
 169         if (!listen_socket->socket_path) goto nomem;
 170         listen_socket->service          = service;
 171         listen_socket->privileged       = True;
 172         status = stream_setup_socket(task->event_ctx, model_ops,
 173                                      &wbsrv_ops, "unix",
 174                                      listen_socket->socket_path, &port,
 175                                      listen_socket);
 176         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 177
 178         return;
 179
 180 listen_failed:
 181         DEBUG(0,("stream_setup_socket(path=%s) failed - %s\n",
 182                  listen_socket->socket_path, nt_errstr(status)));
 183         task_server_terminate(task, nt_errstr(status));
 184         return;
 185 nomem:
 186         task_server_terminate(task, nt_errstr(NT_STATUS_NO_MEMORY));
 187         return;
 188 }
 189
 190 /*
 191   initialise the winbind server
 192  */
 193 static NTSTATUS winbind_init(struct event_context *event_ctx,
 194                              const struct model_ops *model_ops)
 195 {
 196         return task_server_startup(event_ctx, model_ops, winbind_task_init);
 197 }
 198
 199 /*
 200   register ourselves as a available server
 201 */
 202 NTSTATUS server_service_winbind_init(void)
 203 {
 204         return register_server_service("winbind", winbind_init);
 205 }