--- /dev/null
+/*
+ Unix SMB/CIFS mplementation.
+
+ DNS udpate service
+
+ Copyright (C) Andrew Tridgell 2009
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+/*
+ this module auto-creates the named.conf.update file, which tells
+ bind9 what KRB5 principals it should accept for updates to our zone
+ */
+
+#include "includes.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/auth.h"
+#include "smbd/service.h"
+#include "lib/events/events.h"
+#include "lib/messaging/irpc.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "param/param.h"
+#include "system/filesys.h"
+#include "lib/tevent/tevent.h"
+
+struct dnsupdate_service {
+ struct task_server *task;
+ struct auth_session_info *system_session_info;
+ struct ldb_context *samdb;
+
+ struct {
+ uint32_t interval;
+ struct tevent_timer *te;
+ } periodic;
+};
+
+/*
+ called every dnsupdate:interval seconds
+ */
+static void dnsupdate_rebuild(struct dnsupdate_service *service)
+{
+ int ret;
+ struct ldb_result *res;
+ const char *tmp_path, *path;
+ int fd, i;
+ const char *attrs[] = { "sAMAccountName", NULL };
+ const char *realm = lp_realm(service->task->lp_ctx);
+ TALLOC_CTX *tmp_ctx = talloc_new(service);
+ const char *rndc_cmd;
+
+ ret = ldb_search(service->samdb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
+ attrs, "(&(primaryGroupID=%u)(objectClass=computer))",
+ DOMAIN_RID_DCS);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(0,(__location__ ": Unable to find DCs list - %s", ldb_errstring(service->samdb)));
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ path = lp_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "path");
+ if (path == NULL) {
+ path = private_path(tmp_ctx, service->task->lp_ctx, "named.conf.update");
+ }
+
+ tmp_path = talloc_asprintf(tmp_ctx, "%s.tmp", path);
+ if (path == NULL || tmp_path == NULL) {
+ DEBUG(0,(__location__ ": Unable to get paths"));
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ fd = open(tmp_path, O_CREAT|O_TRUNC|O_WRONLY, 0444);
+ if (fd == -1) {
+ DEBUG(1,(__location__ ": Unable to open %s - %s\n", tmp_path, strerror(errno)));
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ dprintf(fd, "/* this file is auto-generated - do not edit */\n");
+ dprintf(fd, "update-policy {\n");
+ dprintf(fd, "\tgrant %s ms-self * A AAAA;\n", realm);
+ dprintf(fd, "\tgrant administrator@%s wildcard * A AAAA SRV CNAME TXT;\n", realm);
+
+ for (i=0; i<res->count; i++) {
+ const char *acctname;
+ acctname = ldb_msg_find_attr_as_string(res->msgs[i],
+ "sAMAccountName", NULL);
+ if (!acctname) continue;
+ dprintf(fd, "\tgrant %s@%s wildcard * A AAAA SRV CNAME;\n",
+ acctname, realm);
+ }
+ dprintf(fd, "};\n");
+ close(fd);
+
+ if (file_compare(tmp_path, path) == true) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ if (rename(tmp_path, path) != 0) {
+ DEBUG(0,(__location__ ": Failed to rename %s to %s - %s\n",
+ tmp_path, path, strerror(errno)));
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ DEBUG(1,("Loaded new DNS update grant rules\n"));
+
+ rndc_cmd = lp_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "rndc reload command");
+ if (!rndc_cmd) {
+ rndc_cmd = "/usr/sbin/rndc reload";
+ }
+ ret = system(rndc_cmd);
+ if (ret != 0) {
+ DEBUG(0,(__location__ ": Failed rndc reload command: '%s' - %d\n",
+ rndc_cmd, ret));
+ }
+
+ talloc_free(tmp_ctx);
+}
+
+static NTSTATUS dnsupdate_periodic_schedule(struct dnsupdate_service *service);
+
+/*
+ called every dnsupdate:interval seconds
+ */
+static void dnsupdate_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
+ struct timeval t, void *ptr)
+{
+ struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
+
+ dnsupdate_rebuild(service);
+ dnsupdate_periodic_schedule(service);
+}
+
+
+static NTSTATUS dnsupdate_periodic_schedule(struct dnsupdate_service *service)
+{
+ service->periodic.te = tevent_add_timer(service->task->event_ctx, service,
+ timeval_current_ofs(service->periodic.interval, 0),
+ dnsupdate_periodic_handler_te, service);
+ NT_STATUS_HAVE_NO_MEMORY(service->periodic.te);
+ return NT_STATUS_OK;
+}
+
+/*
+ startup the dns update task
+*/
+static void dnsupdate_task_init(struct task_server *task)
+{
+ NTSTATUS status;
+ struct dnsupdate_service *service;
+
+ if (lp_server_role(task->lp_ctx) != ROLE_DOMAIN_CONTROLLER) {
+ /* not useful for non-DC */
+ return;
+ }
+
+ task_server_set_title(task, "task[dnsupdate]");
+
+ service = talloc_zero(task, struct dnsupdate_service);
+ if (!service) {
+ task_server_terminate(task, "dnsupdate_task_init: out of memory", true);
+ return;
+ }
+ service->task = task;
+ task->private_data = service;
+
+ service->system_session_info = system_session(service->task->lp_ctx);
+ if (!service->system_session_info) {
+ task_server_terminate(task,
+ "dnsupdate: Failed to obtain server credentials\n",
+ true);
+ return;
+ }
+
+ service->samdb = samdb_connect(service, service->task->event_ctx, task->lp_ctx,
+ service->system_session_info);
+ if (!service->samdb) {
+ task_server_terminate(task, "dnsupdate: Failed to connect to local samdb\n",
+ true);
+ return;
+ }
+
+ service->periodic.interval = lp_parm_int(task->lp_ctx, NULL,
+ "dnsupdate", "interval", 60); /* in seconds */
+
+ status = dnsupdate_periodic_schedule(service);
+ if (!NT_STATUS_IS_OK(status)) {
+ task_server_terminate(task, talloc_asprintf(task,
+ "dnsupdate: Failed to periodic schedule: %s\n",
+ nt_errstr(status)), true);
+ return;
+ }
+
+ irpc_add_name(task->msg_ctx, "dnsupdate");
+
+ /* create the intial file */
+ dnsupdate_rebuild(service);
+
+}
+
+/*
+ register ourselves as a available server
+*/
+NTSTATUS server_service_dnsupdate_init(void)
+{
+ return register_server_service("dnsupdate", dnsupdate_task_init);
+}
git.samba.org / kai / samba.git / commitdiff