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 void skip_become_root(void)
  44 {
  45 }
  46
  47 static void skip_unbecome_root(void)
  48 {
  49 }
  50
  51 static struct dcesrv_context_callbacks srv_callbacks = {
  52         .log.successful_authz = log_successful_dcesrv_authz_event,
  53         .auth.gensec_prepare = dcesrv_gensec_prepare,
  54         .auth.become_root = skip_become_root,
  55         .auth.unbecome_root = skip_unbecome_root,
  56         .assoc_group.find = dcesrv_assoc_group_find,
  57 };
  58
  59 /*
  60  * Need to run the majority of the RPC endpoints in a single process to allow
  61  * for shared handles, and the sharing of ldb contexts.
  62  *
  63  * However other endpoints are capable of being run in multiple processes
  64  * e.g. NETLOGON.
  65  *
  66  * To support this the process model is manipulated to force those end points
  67  * not supporting multiple processes into the single process model. The code
  68  * responsible for this is in dcesrv_init_endpoints
  69  *
  70  */
  71 NTSTATUS server_service_rpc_init(TALLOC_CTX *);
  72
  73 /*
  74  * Initialise the rpc endpoints.
  75  */
  76 static NTSTATUS dcesrv_init_endpoints(struct task_server *task,
  77                                       struct dcesrv_context *dce_ctx,
  78                                       bool use_single_process)
  79 {
  80
  81         struct dcesrv_endpoint *e;
  82         const struct model_ops *model_ops = NULL;
  83
  84         /*
  85          * For those RPC services that run with shared context we need to
  86          * ensure that they don't fork a new process on accept (standard_model).
  87          * And as there is only one process handling these requests we need
  88          * to handle accept errors in a similar manner to the single process
  89          * model.
  90          *
  91          * To do this we override the process model operations with the single
  92          * process operations. This is not the most elegant solution, but it is
  93          * the least ugly, and is confined to the next block of code.
  94          */
  95         if (use_single_process) {
  96                 model_ops = process_model_startup("single");
  97                 if (model_ops == NULL) {
  98                         DBG_ERR("Unable to load single process model");
  99                         return NT_STATUS_INTERNAL_ERROR;
 100                 }
 101         } else {
 102                 model_ops = task->model_ops;
 103         }
 104
 105         for (e = dce_ctx->endpoint_list; e; e = e->next) {
 106
 107                 enum dcerpc_transport_t transport =
 108                     dcerpc_binding_get_transport(e->ep_description);
 109
 110                 if (transport == NCACN_HTTP) {
 111                         /*
 112                          * We don't support ncacn_http yet
 113                          */
 114                         continue;
 115                 }
 116                 if (e->use_single_process == use_single_process) {
 117                         NTSTATUS status;
 118                         status = dcesrv_add_ep(dce_ctx,
 119                                                task->lp_ctx,
 120                                                e,
 121                                                task->event_ctx,
 122                                                model_ops,
 123                                                task->process_context);
 124                         if (!NT_STATUS_IS_OK(status)) {
 125                                 return status;
 126                         }
 127                 }
 128         }
 129         return NT_STATUS_OK;
 130 }
 131
 132 /*
 133  * Initialise the RPC service.
 134  * And those end points that can be serviced by multiple processes.
 135  * The endpoints that need to be run in a single process are setup in the
 136  * post_fork hook.
 137 */
 138 static NTSTATUS dcesrv_task_init(struct task_server *task)
 139 {
 140         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 141         struct dcesrv_context *dce_ctx;
 142         const char **ep_servers = NULL;
 143
 144         dcerpc_server_init(task->lp_ctx);
 145
 146         task_server_set_title(task, "task[dcesrv]");
 147
 148         status = dcesrv_init_context(task->event_ctx,
 149                                      task->lp_ctx,
 150                                      &srv_callbacks,
 151                                      &dce_ctx);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 return status;
 154         }
 155
 156         ep_servers = lpcfg_dcerpc_endpoint_servers(task->lp_ctx);
 157         status = dcesrv_init_ep_servers(dce_ctx, ep_servers);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 return status;
 160         }
 161
 162         /* Make sure the directory for NCALRPC exists */
 163         if (!directory_exist(lpcfg_ncalrpc_dir(task->lp_ctx))) {
 164                 mkdir(lpcfg_ncalrpc_dir(task->lp_ctx), 0755);
 165         }
 166         status = dcesrv_init_endpoints(task, dce_ctx, false);
 167         if (!NT_STATUS_IS_OK(status)) {
 168                 return status;
 169         }
 170
 171         task->private_data = dce_ctx;
 172         return NT_STATUS_OK;
 173 }
 174
 175 /*
 176  * Initialise the endpoints that need to run in a single process fork.
 177  * The endpoint registration is only done for the first process instance.
 178  *
 179  */
 180 static void dcesrv_post_fork(struct task_server *task,
 181                              struct process_details *pd)
 182 {
 183
 184         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 185         struct dcesrv_context *dce_ctx;
 186
 187         if (task->private_data == NULL) {
 188                 task_server_terminate(task, "dcerpc: No dcesrv_context", true);
 189                 return;
 190         }
 191         dce_ctx =
 192             talloc_get_type_abort(task->private_data, struct dcesrv_context);
 193
 194         /*
 195          * Ensure the single process endpoints are only available to the
 196          * first instance.
 197          */
 198         if (pd->instances == 0) {
 199                 status = dcesrv_init_endpoints(task, dce_ctx, true);
 200                 if (!NT_STATUS_IS_OK(status)) {
 201                         task_server_terminate(
 202                             task,
 203                             "dcerpc: Failed to initialise end points",
 204                             true);
 205                         return;
 206                 }
 207         }
 208
 209         irpc_add_name(task->msg_ctx, "rpc_server");
 210 }
 211
 212 NTSTATUS server_service_rpc_init(TALLOC_CTX *ctx)
 213 {
 214         static const struct service_details details = {
 215             .inhibit_fork_on_accept = false,
 216             .inhibit_pre_fork = false,
 217             .task_init = dcesrv_task_init,
 218             .post_fork = dcesrv_post_fork};
 219         return register_server_service(ctx, "rpc", &details);
 220 }