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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/socket/socket.h"
  24 #include "lib/util/dlinklist.h"
  25 #include "lib/events/events.h"
  26 #include "smbd/service_task.h"
  27 #include "smbd/process_model.h"
  28 #include "smbd/service_stream.h"
  29 #include "nsswitch/winbind_nss_config.h"
  30 #include "winbind/wb_server.h"
  31 #include "lib/stream/packet.h"
  32 #include "smbd/service.h"
  33 #include "param/secrets.h"
  34
  35 void wbsrv_terminate_connection(struct wbsrv_connection *wbconn, const char *reason)
  36 {
  37         stream_terminate_connection(wbconn->conn, reason);
  38 }
  39
  40 /*
  41   called on a tcp recv error
  42 */
  43 static void wbsrv_recv_error(void *private, NTSTATUS status)
  44 {
  45         struct wbsrv_connection *wbconn = talloc_get_type(private, struct wbsrv_connection);
  46         wbsrv_terminate_connection(wbconn, nt_errstr(status));
  47 }
  48
  49 static void wbsrv_accept(struct stream_connection *conn)
  50 {
  51         struct wbsrv_listen_socket *listen_socket = talloc_get_type(conn->private,
  52                                                                     struct wbsrv_listen_socket);
  53         struct wbsrv_connection *wbconn;
  54
  55         wbconn = talloc_zero(conn, struct wbsrv_connection);
  56         if (!wbconn) {
  57                 stream_terminate_connection(conn, "wbsrv_accept: out of memory");
  58                 return;
  59         }
  60         wbconn->conn          = conn;
  61         wbconn->listen_socket = listen_socket;
  62         conn->private         = wbconn;
  63
  64         wbconn->packet = packet_init(wbconn);
  65         if (wbconn->packet == NULL) {
  66                 wbsrv_terminate_connection(wbconn, "wbsrv_accept: out of memory");
  67                 return;
  68         }
  69         packet_set_private(wbconn->packet, wbconn);
  70         packet_set_socket(wbconn->packet, conn->socket);
  71         packet_set_callback(wbconn->packet, wbsrv_samba3_process);
  72         packet_set_full_request(wbconn->packet, wbsrv_samba3_packet_full_request);
  73         packet_set_error_handler(wbconn->packet, wbsrv_recv_error);
  74         packet_set_event_context(wbconn->packet, conn->event.ctx);
  75         packet_set_fde(wbconn->packet, conn->event.fde);
  76         packet_set_serialise(wbconn->packet);
  77 }
  78
  79 /*
  80   receive some data on a winbind connection
  81 */
  82 static void wbsrv_recv(struct stream_connection *conn, uint16_t flags)
  83 {
  84         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  85                                                           struct wbsrv_connection);
  86         packet_recv(wbconn->packet);
  87
  88 }
  89
  90 /*
  91   called when we can write to a connection
  92 */
  93 static void wbsrv_send(struct stream_connection *conn, uint16_t flags)
  94 {
  95         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  96                                                           struct wbsrv_connection);
  97         packet_queue_run(wbconn->packet);
  98 }
  99
 100 static const struct stream_server_ops wbsrv_ops = {
 101         .name                   = "winbind samba3 protocol",
 102         .accept_connection      = wbsrv_accept,
 103         .recv_handler           = wbsrv_recv,
 104         .send_handler           = wbsrv_send
 105 };
 106
 107 /*
 108   startup the winbind task
 109 */
 110 static void winbind_task_init(struct task_server *task)
 111 {
 112         uint16_t port = 1;
 113         const struct model_ops *model_ops;
 114         NTSTATUS status;
 115         struct wbsrv_service *service;
 116         struct wbsrv_listen_socket *listen_socket;
 117
 118         task_server_set_title(task, "task[winbind]");
 119
 120         /* within the winbind task we want to be a single process, so
 121            ask for the single process model ops and pass these to the
 122            stream_setup_socket() call. */
 123         model_ops = process_model_byname("single");
 124         if (!model_ops) {
 125                 task_server_terminate(task,
 126                                       "Can't find 'single' process model_ops");
 127                 return;
 128         }
 129
 130         /* Make sure the directory for the Samba3 socket exists, and is of the correct permissions */
 131         if (!directory_create_or_exist(lp_winbindd_socket_directory(), geteuid(), 0755)) {
 132                 task_server_terminate(task,
 133                                       "Cannot create winbindd pipe directory");
 134                 return;
 135         }
 136
 137         service = talloc_zero(task, struct wbsrv_service);
 138         if (!service) goto nomem;
 139         service->task   = task;
 140
 141         service->primary_sid = secrets_get_domain_sid(service,
 142                                                       lp_workgroup());
 143         if (service->primary_sid == NULL) {
 144                 task_server_terminate(
 145                         task, nt_errstr(NT_STATUS_CANT_ACCESS_DOMAIN_INFO));
 146                 return;
 147         }
 148
 149         /* setup the unprivileged samba3 socket */
 150         listen_socket = talloc(service, struct wbsrv_listen_socket);
 151         if (!listen_socket) goto nomem;
 152         listen_socket->socket_path      = talloc_asprintf(listen_socket, "%s/%s",
 153                                                           lp_winbindd_socket_directory(),
 154                                                           WINBINDD_SAMBA3_SOCKET);
 155         if (!listen_socket->socket_path) goto nomem;
 156         listen_socket->service          = service;
 157         listen_socket->privileged       = False;
 158         status = stream_setup_socket(task->event_ctx, model_ops,
 159                                      &wbsrv_ops, "unix",
 160                                      listen_socket->socket_path, &port,
 161                                      listen_socket);
 162         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 163
 164         /* setup the privileged samba3 socket */
 165         listen_socket = talloc(service, struct wbsrv_listen_socket);
 166         if (!listen_socket) goto nomem;
 167         listen_socket->socket_path      =
 168                 smbd_tmp_path(listen_socket,
 169                               WINBINDD_SAMBA3_PRIVILEGED_SOCKET);
 170         if (!listen_socket->socket_path) goto nomem;
 171         listen_socket->service          = service;
 172         listen_socket->privileged       = True;
 173         status = stream_setup_socket(task->event_ctx, model_ops,
 174                                      &wbsrv_ops, "unix",
 175                                      listen_socket->socket_path, &port,
 176                                      listen_socket);
 177         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 178
 179         status = wbsrv_init_irpc(service);
 180         if (!NT_STATUS_IS_OK(status)) goto irpc_failed;
 181
 182         return;
 183
 184 listen_failed:
 185         DEBUG(0,("stream_setup_socket(path=%s) failed - %s\n",
 186                  listen_socket->socket_path, nt_errstr(status)));
 187         task_server_terminate(task, nt_errstr(status));
 188         return;
 189 irpc_failed:
 190         DEBUG(0,("wbsrv_init_irpc() failed - %s\n",
 191                  nt_errstr(status)));
 192         task_server_terminate(task, nt_errstr(status));
 193         return;
 194 nomem:
 195         task_server_terminate(task, nt_errstr(NT_STATUS_NO_MEMORY));
 196         return;
 197 }
 198
 199 /*
 200   initialise the winbind server
 201  */
 202 static NTSTATUS winbind_init(struct event_context *event_ctx,
 203                              const struct model_ops *model_ops)
 204 {
 205         return task_server_startup(event_ctx, model_ops, winbind_task_init);
 206 }
 207
 208 /*
 209   register ourselves as a available server
 210 */
 211 NTSTATUS server_service_winbind_init(void)
 212 {
 213         return register_server_service("winbind", winbind_init);
 214 }