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/*
Unix SMB/CIFS mplementation.
KCC service periodic handling
Copyright (C) Andrew Tridgell 2009
based on repl service code
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/>.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "dsdb/samdb/samdb.h"
#include "auth/auth.h"
#include "smbd/service.h"
#include "lib/messaging/irpc.h"
#include "dsdb/kcc/kcc_service.h"
#include "lib/ldb/include/ldb_errors.h"
#include "../lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "param/param.h"
/*
* see if a repsFromToBlob is in a list
*/
static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
{
int i;
for (i=0; i<count; i++) {
if (strcmp(r->ctr.ctr1.other_info->dns_name,
reps[i].ctr.ctr1.other_info->dns_name) == 0 &&
GUID_compare(&r->ctr.ctr1.source_dsa_obj_guid,
&reps[i].ctr.ctr1.source_dsa_obj_guid) == 0) {
return true;
}
}
return false;
}
/*
* add any missing repsFrom structures to our partitions
*/
static NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
struct repsFromToBlob *reps, uint32_t count)
{
struct kccsrv_partition *p;
/* update the repsFrom on all partitions */
for (p=s->partitions; p; p=p->next) {
struct repsFromToBlob *old_reps;
uint32_t old_count;
WERROR werr;
int i;
bool modified = false;
werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &old_reps, &old_count);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n",
ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
/* add any new ones */
for (i=0; i<count; i++) {
if (!reps_in_list(&reps[i], old_reps, old_count)) {
old_reps = talloc_realloc(mem_ctx, old_reps, struct repsFromToBlob, old_count+1);
NT_STATUS_HAVE_NO_MEMORY(old_reps);
old_reps[old_count] = reps[i];
old_count++;
modified = true;
}
}
/* remove any stale ones */
for (i=0; i<old_count; i++) {
if (!reps_in_list(&old_reps[i], reps, count)) {
memmove(&old_reps[i], &old_reps[i+1], (old_count-(i+1))*sizeof(old_reps[0]));
old_count--;
i--;
modified = true;
}
}
if (modified) {
werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", old_reps, old_count);
if (!W_ERROR_IS_OK(werr)) {
DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n",
ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
}
}
return NT_STATUS_OK;
}
/*
this is the core of our initial simple KCC
We just add a repsFrom entry for all DCs we find that have nTDSDSA
objects, except for ourselves
*/
static NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
{
struct ldb_result *res;
int ret, i;
const char *attrs[] = { "objectGUID", "invocationID", NULL };
struct repsFromToBlob *reps = NULL;
uint32_t count = 0;
ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE,
attrs, "objectClass=nTDSDSA");
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
for (i=0; i<res->count; i++) {
struct repsFromTo1 *r1;
struct GUID ntds_guid, invocation_id;
ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
/* don't replicate with ourselves */
continue;
}
invocation_id = samdb_result_guid(res->msgs[i], "invocationID");
reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
NT_STATUS_HAVE_NO_MEMORY(reps);
ZERO_STRUCT(reps[count]);
reps[count].version = 1;
r1 = &reps[count].ctr.ctr1;
r1->other_info = talloc_zero(reps, struct repsFromTo1OtherInfo);
r1->other_info->dns_name = talloc_asprintf(r1->other_info, "%s._msdcs.%s",
GUID_string(mem_ctx, &ntds_guid),
lp_realm(s->task->lp_ctx));
r1->source_dsa_obj_guid = ntds_guid;
r1->source_dsa_invocation_id = invocation_id;
r1->replica_flags =
DRSUAPI_DS_REPLICA_NEIGHBOUR_WRITEABLE |
DRSUAPI_DS_REPLICA_NEIGHBOUR_SYNC_ON_STARTUP |
DRSUAPI_DS_REPLICA_NEIGHBOUR_DO_SCHEDULED_SYNCS;
memset(r1->schedule, 0x11, sizeof(r1->schedule));
count++;
}
return kccsrv_add_repsFrom(s, mem_ctx, reps, count);
}
static void kccsrv_periodic_run(struct kccsrv_service *service);
static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
struct timeval t, void *ptr)
{
struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
WERROR status;
service->periodic.te = NULL;
kccsrv_periodic_run(service);
status = kccsrv_periodic_schedule(service, service->periodic.interval);
if (!W_ERROR_IS_OK(status)) {
task_server_terminate(service->task, win_errstr(status), true);
return;
}
}
WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
{
TALLOC_CTX *tmp_mem;
struct tevent_timer *new_te;
struct timeval next_time;
/* prevent looping */
if (next_interval == 0) next_interval = 1;
next_time = timeval_current_ofs(next_interval, 50);
if (service->periodic.te) {
/*
* if the timestamp of the new event is higher,
* as current next we don't need to reschedule
*/
if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
return WERR_OK;
}
}
/* reset the next scheduled timestamp */
service->periodic.next_event = next_time;
new_te = event_add_timed(service->task->event_ctx, service,
service->periodic.next_event,
kccsrv_periodic_handler_te, service);
W_ERROR_HAVE_NO_MEMORY(new_te);
tmp_mem = talloc_new(service);
DEBUG(2,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
next_interval,
(service->periodic.te?"re":""),
nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
talloc_free(tmp_mem);
talloc_free(service->periodic.te);
service->periodic.te = new_te;
return WERR_OK;
}
static void kccsrv_periodic_run(struct kccsrv_service *service)
{
TALLOC_CTX *mem_ctx;
NTSTATUS status;
DEBUG(2,("kccsrv_periodic_run(): simple update\n"));
mem_ctx = talloc_new(service);
status = kccsrv_simple_update(service, mem_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
}
talloc_free(mem_ctx);
}
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