LCOV - code coverage report
Current view: top level - source4/rpc_server - service_rpc.c (source / functions) Hit Total Coverage
Test: coverage report for master 2b515b7d Lines: 53 64 82.8 %
Date: 2024-02-28 12:06:22 Functions: 6 6 100.0 %

          Line data    Source code
       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 "samba/process_model.h"
      41             : 
      42       44822 : static void skip_become_root(void)
      43             : {
      44       44822 : }
      45             : 
      46       44822 : static void skip_unbecome_root(void)
      47             : {
      48       44822 : }
      49             : 
      50             : static struct dcesrv_context_callbacks srv_callbacks = {
      51             :         .log.successful_authz = log_successful_dcesrv_authz_event,
      52             :         .auth.gensec_prepare = dcesrv_gensec_prepare,
      53             :         .auth.become_root = skip_become_root,
      54             :         .auth.unbecome_root = skip_unbecome_root,
      55             :         .assoc_group.find = dcesrv_assoc_group_find_s4,
      56             : };
      57             : 
      58             : /*
      59             :  * Need to run the majority of the RPC endpoints in a single process to allow
      60             :  * for shared handles, and the sharing of ldb contexts.
      61             :  *
      62             :  * However other endpoints are capable of being run in multiple processes
      63             :  * e.g. NETLOGON.
      64             :  *
      65             :  * To support this the process model is manipulated to force those end points
      66             :  * not supporting multiple processes into the single process model. The code
      67             :  * responsible for this is in dcesrv_init_endpoints
      68             :  *
      69             :  */
      70             : NTSTATUS server_service_rpc_init(TALLOC_CTX *);
      71             : 
      72             : /*
      73             :  * Initialise the rpc endpoints.
      74             :  */
      75         134 : static NTSTATUS dcesrv_init_endpoints(struct task_server *task,
      76             :                                       struct dcesrv_context *dce_ctx,
      77             :                                       bool use_single_process)
      78             : {
      79             : 
      80           4 :         struct dcesrv_endpoint *e;
      81         134 :         const struct model_ops *model_ops = NULL;
      82             : 
      83             :         /*
      84             :          * For those RPC services that run with shared context we need to
      85             :          * ensure that they don't fork a new process on accept (standard_model).
      86             :          * And as there is only one process handling these requests we need
      87             :          * to handle accept errors in a similar manner to the single process
      88             :          * model.
      89             :          *
      90             :          * To do this we override the process model operations with the single
      91             :          * process operations. This is not the most elegant solution, but it is
      92             :          * the least ugly, and is confined to the next block of code.
      93             :          */
      94         134 :         if (use_single_process) {
      95          68 :                 model_ops = process_model_startup("single");
      96          68 :                 if (model_ops == NULL) {
      97           0 :                         DBG_ERR("Unable to load single process model\n");
      98           0 :                         return NT_STATUS_INTERNAL_ERROR;
      99             :                 }
     100             :         } else {
     101          66 :                 model_ops = task->model_ops;
     102             :         }
     103             : 
     104        2516 :         for (e = dce_ctx->endpoint_list; e; e = e->next) {
     105             : 
     106          68 :                 enum dcerpc_transport_t transport =
     107        2382 :                     dcerpc_binding_get_transport(e->ep_description);
     108             : 
     109        2382 :                 if (transport == NCACN_HTTP) {
     110             :                         /*
     111             :                          * We don't support ncacn_http yet
     112             :                          */
     113         134 :                         continue;
     114             :                 }
     115        2248 :                 if (e->use_single_process == use_single_process) {
     116          32 :                         NTSTATUS status;
     117        1136 :                         status = dcesrv_add_ep(dce_ctx,
     118             :                                                task->lp_ctx,
     119             :                                                e,
     120             :                                                task->event_ctx,
     121             :                                                model_ops,
     122             :                                                task->process_context);
     123        1136 :                         if (!NT_STATUS_IS_OK(status)) {
     124           0 :                                 return status;
     125             :                         }
     126             :                 }
     127             :         }
     128         134 :         return NT_STATUS_OK;
     129             : }
     130             : 
     131             : /*
     132             :  * Initialise the RPC service.
     133             :  * And those end points that can be serviced by multiple processes.
     134             :  * The endpoints that need to be run in a single process are setup in the
     135             :  * post_fork hook.
     136             : */
     137          66 : static NTSTATUS dcesrv_task_init(struct task_server *task)
     138             : {
     139          66 :         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
     140           2 :         struct dcesrv_context *dce_ctx;
     141          66 :         const char **ep_servers = NULL;
     142             : 
     143          66 :         dcerpc_server_init(task->lp_ctx);
     144             : 
     145          66 :         task_server_set_title(task, "task[dcesrv]");
     146             : 
     147          66 :         status = dcesrv_init_context(task->event_ctx,
     148             :                                      task->lp_ctx,
     149             :                                      &srv_callbacks,
     150             :                                      &dce_ctx);
     151          66 :         if (!NT_STATUS_IS_OK(status)) {
     152           0 :                 return status;
     153             :         }
     154             : 
     155          66 :         ep_servers = lpcfg_dcerpc_endpoint_servers(task->lp_ctx);
     156          66 :         status = dcesrv_init_ep_servers(dce_ctx, ep_servers);
     157          66 :         if (!NT_STATUS_IS_OK(status)) {
     158           0 :                 return status;
     159             :         }
     160             : 
     161             :         /* Make sure the directory for NCALRPC exists */
     162          66 :         if (!directory_exist(lpcfg_ncalrpc_dir(task->lp_ctx))) {
     163           2 :                 int ret;
     164             : 
     165          65 :                 ret = mkdir(lpcfg_ncalrpc_dir(task->lp_ctx), 0755);
     166          65 :                 if (ret == -1 && errno != EEXIST) {
     167           0 :                         return map_nt_error_from_unix_common(errno);
     168             :                 }
     169             :         }
     170          66 :         status = dcesrv_init_endpoints(task, dce_ctx, false);
     171          66 :         if (!NT_STATUS_IS_OK(status)) {
     172           0 :                 return status;
     173             :         }
     174             : 
     175          66 :         task->private_data = dce_ctx;
     176          66 :         return NT_STATUS_OK;
     177             : }
     178             : 
     179             : /*
     180             :  * Initialise the endpoints that need to run in a single process fork.
     181             :  * The endpoint registration is only done for the first process instance.
     182             :  *
     183             :  */
     184         146 : static void dcesrv_post_fork(struct task_server *task,
     185             :                              struct process_details *pd)
     186             : {
     187             : 
     188         146 :         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
     189           8 :         struct dcesrv_context *dce_ctx;
     190             : 
     191         146 :         if (task->private_data == NULL) {
     192           0 :                 task_server_terminate(task, "dcerpc: No dcesrv_context", true);
     193           0 :                 return;
     194             :         }
     195           8 :         dce_ctx =
     196         146 :             talloc_get_type_abort(task->private_data, struct dcesrv_context);
     197             : 
     198             :         /*
     199             :          * Ensure the single process endpoints are only available to the
     200             :          * first instance.
     201             :          */
     202         146 :         if (pd->instances == 0) {
     203          68 :                 status = dcesrv_init_endpoints(task, dce_ctx, true);
     204          68 :                 if (!NT_STATUS_IS_OK(status)) {
     205           0 :                         task_server_terminate(
     206             :                             task,
     207             :                             "dcerpc: Failed to initialise end points",
     208             :                             true);
     209           0 :                         return;
     210             :                 }
     211             :         }
     212             : 
     213         146 :         irpc_add_name(task->msg_ctx, "rpc_server");
     214             : }
     215             : 
     216          66 : NTSTATUS server_service_rpc_init(TALLOC_CTX *ctx)
     217             : {
     218           3 :         static const struct service_details details = {
     219             :             .inhibit_fork_on_accept = false,
     220             :             .inhibit_pre_fork = false,
     221             :             .task_init = dcesrv_task_init,
     222             :             .post_fork = dcesrv_post_fork};
     223          66 :         return register_server_service(ctx, "rpc", &details);
     224             : }

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