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 "samba/process_model.h"
  41
  42 static void skip_become_root(void)
  43 {
  44 }
  45
  46 static void skip_unbecome_root(void)
  47 {
  48 }
  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 static NTSTATUS dcesrv_init_endpoints(struct task_server *task,
  76                                       struct dcesrv_context *dce_ctx,
  77                                       bool use_single_process)
  78 {
  79
  80         struct dcesrv_endpoint *e;
  81         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         if (use_single_process) {
  95                 model_ops = process_model_startup("single");
  96                 if (model_ops == NULL) {
  97                         DBG_ERR("Unable to load single process model\n");
  98                         return NT_STATUS_INTERNAL_ERROR;
  99                 }
 100         } else {
 101                 model_ops = task->model_ops;
 102         }
 103
 104         for (e = dce_ctx->endpoint_list; e; e = e->next) {
 105
 106                 enum dcerpc_transport_t transport =
 107                     dcerpc_binding_get_transport(e->ep_description);
 108
 109                 if (transport == NCACN_HTTP) {
 110                         /*
 111                          * We don't support ncacn_http yet
 112                          */
 113                         continue;
 114                 }
 115                 if (e->use_single_process == use_single_process) {
 116                         NTSTATUS status;
 117                         status = dcesrv_add_ep(dce_ctx,
 118                                                task->lp_ctx,
 119                                                e,
 120                                                task->event_ctx,
 121                                                model_ops,
 122                                                task->process_context);
 123                         if (!NT_STATUS_IS_OK(status)) {
 124                                 return status;
 125                         }
 126                 }
 127         }
 128         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 static NTSTATUS dcesrv_task_init(struct task_server *task)
 138 {
 139         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 140         struct dcesrv_context *dce_ctx;
 141         const char **ep_servers = NULL;
 142
 143         dcerpc_server_init(task->lp_ctx);
 144
 145         task_server_set_title(task, "task[dcesrv]");
 146
 147         status = dcesrv_init_context(task->event_ctx,
 148                                      task->lp_ctx,
 149                                      &srv_callbacks,
 150                                      &dce_ctx);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 return status;
 153         }
 154
 155         ep_servers = lpcfg_dcerpc_endpoint_servers(task->lp_ctx);
 156         status = dcesrv_init_ep_servers(dce_ctx, ep_servers);
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 return status;
 159         }
 160
 161         /* Make sure the directory for NCALRPC exists */
 162         if (!directory_exist(lpcfg_ncalrpc_dir(task->lp_ctx))) {
 163                 int ret;
 164
 165                 ret = mkdir(lpcfg_ncalrpc_dir(task->lp_ctx), 0755);
 166                 if (ret == -1 && errno != EEXIST) {
 167                         return map_nt_error_from_unix_common(errno);
 168                 }
 169         }
 170         status = dcesrv_init_endpoints(task, dce_ctx, false);
 171         if (!NT_STATUS_IS_OK(status)) {
 172                 return status;
 173         }
 174
 175         task->private_data = dce_ctx;
 176         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 static void dcesrv_post_fork(struct task_server *task,
 185                              struct process_details *pd)
 186 {
 187
 188         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 189         struct dcesrv_context *dce_ctx;
 190
 191         if (task->private_data == NULL) {
 192                 task_server_terminate(task, "dcerpc: No dcesrv_context", true);
 193                 return;
 194         }
 195         dce_ctx =
 196             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         if (pd->instances == 0) {
 203                 status = dcesrv_init_endpoints(task, dce_ctx, true);
 204                 if (!NT_STATUS_IS_OK(status)) {
 205                         task_server_terminate(
 206                             task,
 207                             "dcerpc: Failed to initialise end points",
 208                             true);
 209                         return;
 210                 }
 211         }
 212
 213         irpc_add_name(task->msg_ctx, "rpc_server");
 214 }
 215
 216 NTSTATUS server_service_rpc_init(TALLOC_CTX *ctx)
 217 {
 218         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         return register_server_service(ctx, "rpc", &details);
 224 }