source4/rpc_server/service_rpc.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    smbd-specific dcerpc server code
   5
   6    Copyright (C) Andrew Tridgell 2003-2005
   7    Copyright (C) Stefan (metze) Metzmacher 2004-2005
   8    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2004,2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_dcerpc.h"
  26 #include "auth/auth.h"
  27 #include "../lib/util/dlinklist.h"
  28 #include "rpc_server/dcerpc_server.h"
  29 #include "rpc_server/dcerpc_server_proto.h"
  30 #include "librpc/rpc/dcerpc.h"
  31 #include "system/filesys.h"
  32 #include "lib/messaging/irpc.h"
  33 #include "system/network.h"
  34 #include "lib/socket/netif.h"
  35 #include "param/param.h"
  36 #include "../lib/tsocket/tsocket.h"
  37 #include "librpc/rpc/dcerpc_proto.h"
  38 #include "../lib/util/tevent_ntstatus.h"
  39 #include "libcli/raw/smb.h"
  40 #include "../libcli/named_pipe_auth/npa_tstream.h"
  41 #include "samba/process_model.h"
  42
  43 static struct dcesrv_context_callbacks srv_callbacks = {
  44         .log.successful_authz = log_successful_dcesrv_authz_event,
  45         .auth.gensec_prepare = dcesrv_gensec_prepare,
  46         .assoc_group.find = dcesrv_assoc_group_find,
  47 };
  48
  49 /*
  50  * Need to run the majority of the RPC endpoints in a single process to allow
  51  * for shared handles, and the sharing of ldb contexts.
  52  *
  53  * However other endpoints are capable of being run in multiple processes
  54  * e.g. NETLOGON.
  55  *
  56  * To support this the process model is manipulated to force those end points
  57  * not supporting multiple processes into the single process model. The code
  58  * responsible for this is in dcesrv_init_endpoints
  59  *
  60  */
  61 NTSTATUS server_service_rpc_init(TALLOC_CTX *);
  62
  63 /*
  64  * Initialise the rpc endpoints.
  65  */
  66 static NTSTATUS dcesrv_init_endpoints(struct task_server *task,
  67                                       struct dcesrv_context *dce_ctx,
  68                                       bool use_single_process)
  69 {
  70
  71         struct dcesrv_endpoint *e;
  72         const struct model_ops *model_ops = NULL;
  73
  74         /*
  75          * For those RPC services that run with shared context we need to
  76          * ensure that they don't fork a new process on accept (standard_model).
  77          * And as there is only one process handling these requests we need
  78          * to handle accept errors in a similar manner to the single process
  79          * model.
  80          *
  81          * To do this we override the process model operations with the single
  82          * process operations. This is not the most elegant solution, but it is
  83          * the least ugly, and is confined to the next block of code.
  84          */
  85         if (use_single_process) {
  86                 model_ops = process_model_startup("single");
  87                 if (model_ops == NULL) {
  88                         DBG_ERR("Unable to load single process model");
  89                         return NT_STATUS_INTERNAL_ERROR;
  90                 }
  91         } else {
  92                 model_ops = task->model_ops;
  93         }
  94
  95         for (e = dce_ctx->endpoint_list; e; e = e->next) {
  96
  97                 enum dcerpc_transport_t transport =
  98                     dcerpc_binding_get_transport(e->ep_description);
  99
 100                 if (transport == NCACN_HTTP) {
 101                         /*
 102                          * We don't support ncacn_http yet
 103                          */
 104                         continue;
 105                 }
 106                 if (e->use_single_process == use_single_process) {
 107                         NTSTATUS status;
 108                         status = dcesrv_add_ep(dce_ctx,
 109                                                task->lp_ctx,
 110                                                e,
 111                                                task->event_ctx,
 112                                                model_ops,
 113                                                task->process_context);
 114                         if (!NT_STATUS_IS_OK(status)) {
 115                                 return status;
 116                         }
 117                 }
 118         }
 119         return NT_STATUS_OK;
 120 }
 121
 122 /*
 123  * Initialise the RPC service.
 124  * And those end points that can be serviced by multiple processes.
 125  * The endpoints that need to be run in a single process are setup in the
 126  * post_fork hook.
 127 */
 128 static NTSTATUS dcesrv_task_init(struct task_server *task)
 129 {
 130         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 131         struct dcesrv_context *dce_ctx;
 132         const char **ep_servers = NULL;
 133
 134         dcerpc_server_init(task->lp_ctx);
 135
 136         task_server_set_title(task, "task[dcesrv]");
 137
 138         status = dcesrv_init_context(task->event_ctx,
 139                                      task->lp_ctx,
 140                                      &srv_callbacks,
 141                                      &dce_ctx);
 142         if (!NT_STATUS_IS_OK(status)) {
 143                 return status;
 144         }
 145
 146         ep_servers = lpcfg_dcerpc_endpoint_servers(task->lp_ctx);
 147         status = dcesrv_init_ep_servers(dce_ctx, ep_servers);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 return status;
 150         }
 151
 152         /* Make sure the directory for NCALRPC exists */
 153         if (!directory_exist(lpcfg_ncalrpc_dir(task->lp_ctx))) {
 154                 mkdir(lpcfg_ncalrpc_dir(task->lp_ctx), 0755);
 155         }
 156         status = dcesrv_init_endpoints(task, dce_ctx, false);
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 return status;
 159         }
 160
 161         task->private_data = dce_ctx;
 162         return NT_STATUS_OK;
 163 }
 164
 165 /*
 166  * Initialise the endpoints that need to run in a single process fork.
 167  * The endpoint registration is only done for the first process instance.
 168  *
 169  */
 170 static void dcesrv_post_fork(struct task_server *task,
 171                              struct process_details *pd)
 172 {
 173
 174         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 175         struct dcesrv_context *dce_ctx;
 176
 177         if (task->private_data == NULL) {
 178                 task_server_terminate(task, "dcerpc: No dcesrv_context", true);
 179                 return;
 180         }
 181         dce_ctx =
 182             talloc_get_type_abort(task->private_data, struct dcesrv_context);
 183
 184         /*
 185          * Ensure the single process endpoints are only available to the
 186          * first instance.
 187          */
 188         if (pd->instances == 0) {
 189                 status = dcesrv_init_endpoints(task, dce_ctx, true);
 190                 if (!NT_STATUS_IS_OK(status)) {
 191                         task_server_terminate(
 192                             task,
 193                             "dcerpc: Failed to initialise end points",
 194                             true);
 195                         return;
 196                 }
 197         }
 198
 199         irpc_add_name(task->msg_ctx, "rpc_server");
 200 }
 201
 202 NTSTATUS server_service_rpc_init(TALLOC_CTX *ctx)
 203 {
 204         static const struct service_details details = {
 205             .inhibit_fork_on_accept = false,
 206             .inhibit_pre_fork = false,
 207             .task_init = dcesrv_task_init,
 208             .post_fork = dcesrv_post_fork};
 209         return register_server_service(ctx, "rpc", &details);
 210 }