2 Unix SMB/CIFS mplementation.
6 Copyright (C) Andrew Tridgell 2009
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 this module auto-creates the named.conf.update file, which tells
25 bind9 what KRB5 principals it should accept for updates to our zone
27 It also uses the samba_dnsupdate script to auto-create the right DNS
28 names for ourselves as a DC in the domain, using TSIG-GSS
32 #include "dsdb/samdb/samdb.h"
33 #include "auth/auth.h"
34 #include "smbd/service.h"
35 #include "lib/messaging/irpc.h"
36 #include "param/param.h"
37 #include "system/filesys.h"
38 #include "libcli/composite/composite.h"
40 struct dnsupdate_service {
41 struct task_server *task;
42 struct auth_session_info *system_session_info;
43 struct ldb_context *samdb;
45 /* status for periodic config file update */
48 struct tevent_timer *te;
49 struct composite_context *c;
53 /* status for periodic DNS name check */
56 struct tevent_timer *te;
57 struct composite_context *c;
63 called when rndc reload has finished
65 static void dnsupdate_rndc_done(struct composite_context *c)
67 struct dnsupdate_service *service = talloc_get_type_abort(c->async.private_data,
68 struct dnsupdate_service);
69 service->confupdate.status = composite_wait(c);
71 service->confupdate.c = NULL;
72 if (!NT_STATUS_IS_OK(service->confupdate.status)) {
73 DEBUG(0,(__location__ ": Failed rndc update - %s\n",
74 nt_errstr(service->confupdate.status)));
76 DEBUG(3,("Completed rndc reload OK\n"));
81 called every 'dnsupdate:conf interval' seconds
83 static void dnsupdate_rebuild(struct dnsupdate_service *service)
86 struct ldb_result *res;
87 const char *tmp_path, *path;
89 const char *attrs[] = { "sAMAccountName", NULL };
90 const char *realm = lp_realm(service->task->lp_ctx);
91 TALLOC_CTX *tmp_ctx = talloc_new(service);
93 ret = ldb_search(service->samdb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
94 attrs, "(&(primaryGroupID=%u)(objectClass=computer))",
96 if (ret != LDB_SUCCESS) {
97 DEBUG(0,(__location__ ": Unable to find DCs list - %s", ldb_errstring(service->samdb)));
102 path = lp_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "path");
104 path = private_path(tmp_ctx, service->task->lp_ctx, "named.conf.update");
107 tmp_path = talloc_asprintf(tmp_ctx, "%s.tmp", path);
108 if (path == NULL || tmp_path == NULL) {
109 DEBUG(0,(__location__ ": Unable to get paths"));
110 talloc_free(tmp_ctx);
115 fd = open(tmp_path, O_CREAT|O_TRUNC|O_WRONLY, 0444);
117 DEBUG(1,(__location__ ": Unable to open %s - %s\n", tmp_path, strerror(errno)));
118 talloc_free(tmp_ctx);
122 dprintf(fd, "/* this file is auto-generated - do not edit */\n");
123 dprintf(fd, "update-policy {\n");
124 dprintf(fd, "\tgrant %s ms-self * A AAAA;\n", realm);
125 dprintf(fd, "\tgrant administrator@%s wildcard * A AAAA SRV CNAME TXT;\n", realm);
127 for (i=0; i<res->count; i++) {
128 const char *acctname;
129 acctname = ldb_msg_find_attr_as_string(res->msgs[i],
130 "sAMAccountName", NULL);
131 if (!acctname) continue;
132 dprintf(fd, "\tgrant %s@%s wildcard * A AAAA SRV CNAME;\n",
138 if (service->confupdate.c != NULL) {
139 talloc_free(service->confupdate.c);
140 service->confupdate.c = NULL;
143 if (NT_STATUS_IS_OK(service->confupdate.status) &&
144 file_compare(tmp_path, path) == true) {
146 talloc_free(tmp_ctx);
150 if (rename(tmp_path, path) != 0) {
151 DEBUG(0,(__location__ ": Failed to rename %s to %s - %s\n",
152 tmp_path, path, strerror(errno)));
153 talloc_free(tmp_ctx);
157 DEBUG(2,("Loading new DNS update grant rules\n"));
158 service->confupdate.c = samba_runcmd(service->task->event_ctx, service,
159 timeval_current_ofs(10, 0),
161 lp_rndc_command(service->task->lp_ctx),
163 service->confupdate.c->async.fn = dnsupdate_rndc_done;
164 service->confupdate.c->async.private_data = service;
166 talloc_free(tmp_ctx);
169 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service);
172 called every 'dnsupdate:conf interval' seconds
174 static void dnsupdate_confupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
175 struct timeval t, void *ptr)
177 struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
179 dnsupdate_rebuild(service);
180 dnsupdate_confupdate_schedule(service);
184 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service)
186 service->confupdate.te = tevent_add_timer(service->task->event_ctx, service,
187 timeval_current_ofs(service->confupdate.interval, 0),
188 dnsupdate_confupdate_handler_te, service);
189 NT_STATUS_HAVE_NO_MEMORY(service->confupdate.te);
195 called when dns update script has finished
197 static void dnsupdate_nameupdate_done(struct composite_context *c)
199 struct dnsupdate_service *service = talloc_get_type_abort(c->async.private_data,
200 struct dnsupdate_service);
201 service->nameupdate.status = composite_wait(c);
203 service->nameupdate.c = NULL;
204 if (!NT_STATUS_IS_OK(service->nameupdate.status)) {
205 DEBUG(0,(__location__ ": Failed DNS update - %s\n",
206 nt_errstr(service->nameupdate.status)));
208 DEBUG(3,("Completed DNS update check OK\n"));
213 called every 'dnsupdate:name interval' seconds
215 static void dnsupdate_check_names(struct dnsupdate_service *service)
217 /* kill any existing child */
218 if (service->nameupdate.c != NULL) {
219 talloc_free(service->nameupdate.c);
220 service->nameupdate.c = NULL;
223 DEBUG(3,("Calling DNS name update script\n"));
224 service->nameupdate.c = samba_runcmd(service->task->event_ctx, service,
225 timeval_current_ofs(10, 0),
227 lp_dns_update_command(service->task->lp_ctx),
229 service->nameupdate.c->async.fn = dnsupdate_nameupdate_done;
230 service->nameupdate.c->async.private_data = service;
233 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service);
236 called every 'dnsupdate:name interval' seconds
238 static void dnsupdate_nameupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
239 struct timeval t, void *ptr)
241 struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
243 dnsupdate_check_names(service);
244 dnsupdate_nameupdate_schedule(service);
248 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service)
250 service->nameupdate.te = tevent_add_timer(service->task->event_ctx, service,
251 timeval_current_ofs(service->nameupdate.interval, 0),
252 dnsupdate_nameupdate_handler_te, service);
253 NT_STATUS_HAVE_NO_MEMORY(service->nameupdate.te);
258 startup the dns update task
260 static void dnsupdate_task_init(struct task_server *task)
263 struct dnsupdate_service *service;
265 if (lp_server_role(task->lp_ctx) != ROLE_DOMAIN_CONTROLLER) {
266 /* not useful for non-DC */
270 task_server_set_title(task, "task[dnsupdate]");
272 service = talloc_zero(task, struct dnsupdate_service);
274 task_server_terminate(task, "dnsupdate_task_init: out of memory", true);
277 service->task = task;
278 task->private_data = service;
280 service->system_session_info = system_session(service->task->lp_ctx);
281 if (!service->system_session_info) {
282 task_server_terminate(task,
283 "dnsupdate: Failed to obtain server credentials\n",
288 service->samdb = samdb_connect(service, service->task->event_ctx, task->lp_ctx,
289 service->system_session_info);
290 if (!service->samdb) {
291 task_server_terminate(task, "dnsupdate: Failed to connect to local samdb\n",
296 service->confupdate.interval = lp_parm_int(task->lp_ctx, NULL,
297 "dnsupdate", "config interval", 60); /* in seconds */
299 service->nameupdate.interval = lp_parm_int(task->lp_ctx, NULL,
300 "dnsupdate", "name interval", 600); /* in seconds */
302 dnsupdate_rebuild(service);
303 status = dnsupdate_confupdate_schedule(service);
304 if (!NT_STATUS_IS_OK(status)) {
305 task_server_terminate(task, talloc_asprintf(task,
306 "dnsupdate: Failed to confupdate schedule: %s\n",
307 nt_errstr(status)), true);
311 dnsupdate_check_names(service);
312 status = dnsupdate_nameupdate_schedule(service);
313 if (!NT_STATUS_IS_OK(status)) {
314 task_server_terminate(task, talloc_asprintf(task,
315 "dnsupdate: Failed to nameupdate schedule: %s\n",
316 nt_errstr(status)), true);
320 irpc_add_name(task->msg_ctx, "dnsupdate");
322 /* create the intial file */
323 dnsupdate_rebuild(service);
328 register ourselves as a available server
330 NTSTATUS server_service_dnsupdate_init(void)
332 return register_server_service("dnsupdate", dnsupdate_task_init);