source4/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 #include "param/param.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         wbconn->lp_ctx        = listen_socket->service->task->lp_ctx;
  64         conn->private         = wbconn;
  65
  66         wbconn->packet = packet_init(wbconn);
  67         if (wbconn->packet == NULL) {
  68                 wbsrv_terminate_connection(wbconn, "wbsrv_accept: out of memory");
  69                 return;
  70         }
  71         packet_set_private(wbconn->packet, wbconn);
  72         packet_set_socket(wbconn->packet, conn->socket);
  73         packet_set_callback(wbconn->packet, wbsrv_samba3_process);
  74         packet_set_full_request(wbconn->packet, wbsrv_samba3_packet_full_request);
  75         packet_set_error_handler(wbconn->packet, wbsrv_recv_error);
  76         packet_set_event_context(wbconn->packet, conn->event.ctx);
  77         packet_set_fde(wbconn->packet, conn->event.fde);
  78         packet_set_serialise(wbconn->packet);
  79 }
  80
  81 /*
  82   receive some data on a winbind connection
  83 */
  84 static void wbsrv_recv(struct stream_connection *conn, uint16_t flags)
  85 {
  86         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  87                                                           struct wbsrv_connection);
  88         packet_recv(wbconn->packet);
  89
  90 }
  91
  92 /*
  93   called when we can write to a connection
  94 */
  95 static void wbsrv_send(struct stream_connection *conn, uint16_t flags)
  96 {
  97         struct wbsrv_connection *wbconn = talloc_get_type(conn->private,
  98                                                           struct wbsrv_connection);
  99         packet_queue_run(wbconn->packet);
 100 }
 101
 102 static const struct stream_server_ops wbsrv_ops = {
 103         .name                   = "winbind samba3 protocol",
 104         .accept_connection      = wbsrv_accept,
 105         .recv_handler           = wbsrv_recv,
 106         .send_handler           = wbsrv_send
 107 };
 108
 109 /*
 110   startup the winbind task
 111 */
 112 static void winbind_task_init(struct task_server *task)
 113 {
 114         uint16_t port = 1;
 115         const struct model_ops *model_ops;
 116         NTSTATUS status;
 117         struct wbsrv_service *service;
 118         struct wbsrv_listen_socket *listen_socket;
 119
 120         task_server_set_title(task, "task[winbind]");
 121
 122         /* within the winbind task we want to be a single process, so
 123            ask for the single process model ops and pass these to the
 124            stream_setup_socket() call. */
 125         model_ops = process_model_byname("single");
 126         if (!model_ops) {
 127                 task_server_terminate(task,
 128                                       "Can't find 'single' process model_ops");
 129                 return;
 130         }
 131
 132         /* Make sure the directory for the Samba3 socket exists, and is of the correct permissions */
 133         if (!directory_create_or_exist(lp_winbindd_socket_directory(task->lp_ctx), geteuid(), 0755)) {
 134                 task_server_terminate(task,
 135                                       "Cannot create winbindd pipe directory");
 136                 return;
 137         }
 138
 139         service = talloc_zero(task, struct wbsrv_service);
 140         if (!service) goto nomem;
 141         service->task   = task;
 142
 143         service->primary_sid = secrets_get_domain_sid(service,
 144                                                       task->lp_ctx,
 145                                                       lp_workgroup(task->lp_ctx));
 146         if (service->primary_sid == NULL) {
 147                 task_server_terminate(
 148                         task, nt_errstr(NT_STATUS_CANT_ACCESS_DOMAIN_INFO));
 149                 return;
 150         }
 151
 152         service->idmap_ctx = idmap_init(service, task->event_ctx, task->lp_ctx);
 153         if (service->idmap_ctx == NULL) {
 154                 task_server_terminate(task, "Failed to load idmap database");
 155                 return;
 156         }
 157
 158         /* setup the unprivileged samba3 socket */
 159         listen_socket = talloc(service, struct wbsrv_listen_socket);
 160         if (!listen_socket) goto nomem;
 161         listen_socket->socket_path      = talloc_asprintf(listen_socket, "%s/%s",
 162                                                           lp_winbindd_socket_directory(task->lp_ctx),
 163                                                           WINBINDD_SAMBA3_SOCKET);
 164         if (!listen_socket->socket_path) goto nomem;
 165         listen_socket->service          = service;
 166         listen_socket->privileged       = false;
 167         status = stream_setup_socket(task->event_ctx, task->lp_ctx, model_ops,
 168                                      &wbsrv_ops, "unix",
 169                                      listen_socket->socket_path, &port,
 170                                      lp_socket_options(task->lp_ctx),
 171                                      listen_socket);
 172         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 173
 174         /* setup the privileged samba3 socket */
 175         listen_socket = talloc(service, struct wbsrv_listen_socket);
 176         if (!listen_socket) goto nomem;
 177         listen_socket->socket_path      =
 178                 smbd_tmp_path(listen_socket, task->lp_ctx,
 179                               WINBINDD_SAMBA3_PRIVILEGED_SOCKET);
 180         if (!listen_socket->socket_path) goto nomem;
 181         listen_socket->service          = service;
 182         listen_socket->privileged       = true;
 183         status = stream_setup_socket(task->event_ctx, task->lp_ctx, model_ops,
 184                                      &wbsrv_ops, "unix",
 185                                      listen_socket->socket_path, &port,
 186                                      lp_socket_options(task->lp_ctx),
 187                                      listen_socket);
 188         if (!NT_STATUS_IS_OK(status)) goto listen_failed;
 189
 190         status = wbsrv_init_irpc(service);
 191         if (!NT_STATUS_IS_OK(status)) goto irpc_failed;
 192
 193         return;
 194
 195 listen_failed:
 196         DEBUG(0,("stream_setup_socket(path=%s) failed - %s\n",
 197                  listen_socket->socket_path, nt_errstr(status)));
 198         task_server_terminate(task, nt_errstr(status));
 199         return;
 200 irpc_failed:
 201         DEBUG(0,("wbsrv_init_irpc() failed - %s\n",
 202                  nt_errstr(status)));
 203         task_server_terminate(task, nt_errstr(status));
 204         return;
 205 nomem:
 206         task_server_terminate(task, nt_errstr(NT_STATUS_NO_MEMORY));
 207         return;
 208 }
 209
 210 /*
 211   register ourselves as a available server
 212 */
 213 NTSTATUS server_service_winbind_init(void)
 214 {
 215         return register_server_service("winbind", winbind_task_init);
 216 }