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 "smbd/process_model.h"
42
43 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 */
dcesrv_init_endpoints(struct task_server * task,struct dcesrv_context * dce_ctx,bool use_single_process)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 == true) {
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 */
dcesrv_task_init(struct task_server * task)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 */
dcesrv_post_fork(struct task_server * task,struct process_details * pd)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
server_service_rpc_init(TALLOC_CTX * ctx)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 }
211