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https://github.com/samba-team/samba.git
synced 2025-01-11 05:18:09 +03:00
s4-dns: added a dns update task
This task watches for changes in the list of DCs, and creates a bind9 formatted file that grants update permission to all DCs, plus to the administration, and machines update for their own names. Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Andrew Tridgell
parent
6bfb216293
commit
89b6a80e72
@ -90,3 +90,16 @@ KCC_SRV_OBJ_FILES = $(addprefix $(dsdbsrcdir)/kcc/, \
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$(eval $(call proto_header_template,$(dsdbsrcdir)/kcc/kcc_service_proto.h,$(KCC_SRV_OBJ_FILES:.o=.c)))
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#######################
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# Start SUBSYSTEM DNS_UPDATE_SRV
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[MODULE::DNS_UPDATE_SRV]
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INIT_FUNCTION = server_service_dnsupdate_init
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SUBSYSTEM = service
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PRIVATE_DEPENDENCIES = \
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SAMDB \
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process_model
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# End SUBSYSTEM DNS_UPDATE_SRV
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#######################
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DNS_UPDATE_SRV_OBJ_FILES = $(addprefix $(dsdbsrcdir)/dns/, \
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dns_update.o)
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222
source4/dsdb/dns/dns_update.c
Normal file
222
source4/dsdb/dns/dns_update.c
Normal file
@ -0,0 +1,222 @@
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/*
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Unix SMB/CIFS mplementation.
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DNS udpate service
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Copyright (C) Andrew Tridgell 2009
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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this module auto-creates the named.conf.update file, which tells
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bind9 what KRB5 principals it should accept for updates to our zone
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*/
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#include "includes.h"
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#include "dsdb/samdb/samdb.h"
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#include "auth/auth.h"
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#include "smbd/service.h"
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#include "lib/events/events.h"
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#include "lib/messaging/irpc.h"
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#include "lib/ldb/include/ldb_errors.h"
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#include "param/param.h"
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#include "system/filesys.h"
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#include "lib/tevent/tevent.h"
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struct dnsupdate_service {
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struct task_server *task;
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struct auth_session_info *system_session_info;
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struct ldb_context *samdb;
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struct {
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uint32_t interval;
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struct tevent_timer *te;
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} periodic;
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};
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/*
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called every dnsupdate:interval seconds
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*/
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static void dnsupdate_rebuild(struct dnsupdate_service *service)
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{
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int ret;
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struct ldb_result *res;
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const char *tmp_path, *path;
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int fd, i;
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const char *attrs[] = { "sAMAccountName", NULL };
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const char *realm = lp_realm(service->task->lp_ctx);
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TALLOC_CTX *tmp_ctx = talloc_new(service);
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const char *rndc_cmd;
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ret = ldb_search(service->samdb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
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attrs, "(&(primaryGroupID=%u)(objectClass=computer))",
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DOMAIN_RID_DCS);
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if (ret != LDB_SUCCESS) {
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DEBUG(0,(__location__ ": Unable to find DCs list - %s", ldb_errstring(service->samdb)));
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talloc_free(tmp_ctx);
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return;
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}
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path = lp_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "path");
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if (path == NULL) {
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path = private_path(tmp_ctx, service->task->lp_ctx, "named.conf.update");
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}
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tmp_path = talloc_asprintf(tmp_ctx, "%s.tmp", path);
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if (path == NULL || tmp_path == NULL) {
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DEBUG(0,(__location__ ": Unable to get paths"));
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talloc_free(tmp_ctx);
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return;
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}
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fd = open(tmp_path, O_CREAT|O_TRUNC|O_WRONLY, 0444);
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if (fd == -1) {
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DEBUG(1,(__location__ ": Unable to open %s - %s\n", tmp_path, strerror(errno)));
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talloc_free(tmp_ctx);
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return;
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}
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dprintf(fd, "/* this file is auto-generated - do not edit */\n");
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dprintf(fd, "update-policy {\n");
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dprintf(fd, "\tgrant %s ms-self * A AAAA;\n", realm);
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dprintf(fd, "\tgrant administrator@%s wildcard * A AAAA SRV CNAME TXT;\n", realm);
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for (i=0; i<res->count; i++) {
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const char *acctname;
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acctname = ldb_msg_find_attr_as_string(res->msgs[i],
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"sAMAccountName", NULL);
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if (!acctname) continue;
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dprintf(fd, "\tgrant %s@%s wildcard * A AAAA SRV CNAME;\n",
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acctname, realm);
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}
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dprintf(fd, "};\n");
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close(fd);
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if (file_compare(tmp_path, path) == true) {
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talloc_free(tmp_ctx);
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return;
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}
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if (rename(tmp_path, path) != 0) {
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DEBUG(0,(__location__ ": Failed to rename %s to %s - %s\n",
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tmp_path, path, strerror(errno)));
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talloc_free(tmp_ctx);
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return;
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}
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DEBUG(1,("Loaded new DNS update grant rules\n"));
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rndc_cmd = lp_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "rndc reload command");
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if (!rndc_cmd) {
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rndc_cmd = "/usr/sbin/rndc reload";
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}
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ret = system(rndc_cmd);
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if (ret != 0) {
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DEBUG(0,(__location__ ": Failed rndc reload command: '%s' - %d\n",
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rndc_cmd, ret));
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}
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talloc_free(tmp_ctx);
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}
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static NTSTATUS dnsupdate_periodic_schedule(struct dnsupdate_service *service);
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/*
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called every dnsupdate:interval seconds
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*/
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static void dnsupdate_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *ptr)
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{
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struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
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dnsupdate_rebuild(service);
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dnsupdate_periodic_schedule(service);
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}
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static NTSTATUS dnsupdate_periodic_schedule(struct dnsupdate_service *service)
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{
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service->periodic.te = tevent_add_timer(service->task->event_ctx, service,
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timeval_current_ofs(service->periodic.interval, 0),
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dnsupdate_periodic_handler_te, service);
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NT_STATUS_HAVE_NO_MEMORY(service->periodic.te);
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return NT_STATUS_OK;
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}
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/*
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startup the dns update task
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*/
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static void dnsupdate_task_init(struct task_server *task)
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{
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NTSTATUS status;
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struct dnsupdate_service *service;
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if (lp_server_role(task->lp_ctx) != ROLE_DOMAIN_CONTROLLER) {
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/* not useful for non-DC */
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return;
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}
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task_server_set_title(task, "task[dnsupdate]");
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service = talloc_zero(task, struct dnsupdate_service);
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if (!service) {
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task_server_terminate(task, "dnsupdate_task_init: out of memory", true);
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return;
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}
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service->task = task;
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task->private_data = service;
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service->system_session_info = system_session(service->task->lp_ctx);
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if (!service->system_session_info) {
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task_server_terminate(task,
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"dnsupdate: Failed to obtain server credentials\n",
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true);
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return;
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}
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service->samdb = samdb_connect(service, service->task->event_ctx, task->lp_ctx,
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service->system_session_info);
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if (!service->samdb) {
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task_server_terminate(task, "dnsupdate: Failed to connect to local samdb\n",
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true);
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return;
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}
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service->periodic.interval = lp_parm_int(task->lp_ctx, NULL,
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"dnsupdate", "interval", 60); /* in seconds */
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status = dnsupdate_periodic_schedule(service);
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if (!NT_STATUS_IS_OK(status)) {
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task_server_terminate(task, talloc_asprintf(task,
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"dnsupdate: Failed to periodic schedule: %s\n",
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nt_errstr(status)), true);
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return;
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}
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irpc_add_name(task->msg_ctx, "dnsupdate");
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/* create the intial file */
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dnsupdate_rebuild(service);
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}
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/*
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register ourselves as a available server
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*/
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NTSTATUS server_service_dnsupdate_init(void)
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{
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return register_server_service("dnsupdate", dnsupdate_task_init);
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}
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@ -2329,7 +2329,7 @@ struct loadparm_context *loadparm_init(TALLOC_CTX *mem_ctx)
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lp_do_global_parameter(lp_ctx, "max connections", "-1");
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lp_do_global_parameter(lp_ctx, "dcerpc endpoint servers", "epmapper srvsvc wkssvc rpcecho samr netlogon lsarpc spoolss drsuapi winreg dssetup unixinfo browser");
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lp_do_global_parameter(lp_ctx, "server services", "smb rpc nbt wrepl ldap cldap kdc drepl winbind ntp_signd kcc");
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lp_do_global_parameter(lp_ctx, "server services", "smb rpc nbt wrepl ldap cldap kdc drepl winbind ntp_signd kcc dnsupdate");
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lp_do_global_parameter(lp_ctx, "ntptr providor", "simple_ldb");
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lp_do_global_parameter(lp_ctx, "auth methods:domain controller", "anonymous sam_ignoredomain");
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lp_do_global_parameter(lp_ctx, "auth methods:member server", "anonymous sam winbind");
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@ -256,6 +256,7 @@ static int binary_smbd_main(const char *binary_name, int argc, const char *argv[
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extern NTSTATUS server_service_smb_init(void);
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extern NTSTATUS server_service_drepl_init(void);
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extern NTSTATUS server_service_kcc_init(void);
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extern NTSTATUS server_service_dnsupdate_init(void);
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extern NTSTATUS server_service_rpc_init(void);
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extern NTSTATUS server_service_ntp_signd_init(void);
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extern NTSTATUS server_service_samba3_smb_init(void);
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