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/*
* Unix SMB/CIFS implementation.
* Group Policy Update event for winbindd
* Copyright (C) David Mulder 2017
*
* 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 "param/param.h"
#include "param/loadparm.h"
#include "winbindd.h"
#include "lib/global_contexts.h"
/*
* gpupdate_interval()
* return Random integer between 5400 and 7200, the group policy update
* interval in seconds
*
* Group Policy should be updated every 90 minutes in the background,
* with a random offset between 0 and 30 minutes. This ensures multiple
* clients will not update at the same time.
*/
#define GPUPDATE_INTERVAL (90*60)
#define GPUPDATE_RAND_OFFSET (30*60)
static uint32_t gpupdate_interval(void)
{
int rand_int_offset = generate_random() % GPUPDATE_RAND_OFFSET;
return GPUPDATE_INTERVAL+rand_int_offset;
}
struct gpupdate_state {
TALLOC_CTX *ctx;
struct loadparm_context *lp_ctx;
};
static void gpupdate_cmd_done(struct tevent_req *subreq);
static void gpupdate_callback(struct tevent_context *ev,
struct tevent_timer *tim,
struct timeval current_time,
void *private_data)
{
struct tevent_timer *time_event;
struct timeval schedule;
struct tevent_req *req = NULL;
struct gpupdate_state *data =
talloc_get_type_abort(private_data, struct gpupdate_state);
const char *const *gpupdate_cmd =
lpcfg_gpo_update_command(data->lp_ctx);
const char *smbconf = lpcfg_configfile(data->lp_ctx);
if (smbconf == NULL) {
smbconf = lp_default_path();
}
/* Execute gpupdate */
req = samba_runcmd_send(data->ctx, ev, timeval_zero(), 2, 0,
gpupdate_cmd,
"-s",
smbconf,
"--target=Computer",
"--machine-pass",
NULL);
if (req == NULL) {
DEBUG(0, ("Failed to execute the gpupdate command\n"));
return;
}
tevent_req_set_callback(req, gpupdate_cmd_done, NULL);
/* Schedule the next event */
schedule = tevent_timeval_current_ofs(gpupdate_interval(), 0);
time_event = tevent_add_timer(ev, data->ctx, schedule,
gpupdate_callback, data);
if (time_event == NULL) {
DEBUG(0, ("Failed scheduling the next gpupdate event\n"));
}
}
void gpupdate_init(void)
{
struct tevent_timer *time_event;
struct timeval schedule;
TALLOC_CTX * ctx = talloc_new(global_event_context());
struct gpupdate_state *data = talloc(ctx, struct gpupdate_state);
struct loadparm_context *lp_ctx =
loadparm_init_s3(NULL, loadparm_s3_helpers());
/*
* Check if gpupdate is enabled for winbind, if not
* return without scheduling any events.
*/
if (!lpcfg_apply_group_policies(lp_ctx)) {
return;
}
/*
* Execute the first event immediately, future events
* will execute on the gpupdate interval, which is every
* 90 to 120 minutes (at random).
*/
schedule = tevent_timeval_current_ofs(0, 0);
data->ctx = ctx;
data->lp_ctx = lp_ctx;
if (data->lp_ctx == NULL) {
smb_panic("Could not load smb.conf\n");
}
time_event = tevent_add_timer(global_event_context(), data->ctx,
schedule, gpupdate_callback, data);
if (time_event == NULL) {
DEBUG(0, ("Failed scheduling the gpupdate event\n"));
}
}
void gpupdate_user_init(const char *user)
{
struct tevent_req *req = NULL;
TALLOC_CTX *ctx = talloc_new(global_event_context());
struct loadparm_context *lp_ctx =
loadparm_init_s3(NULL, loadparm_s3_helpers());
const char *const *gpupdate_cmd = lpcfg_gpo_update_command(lp_ctx);
const char *smbconf = lpcfg_configfile(lp_ctx);
if (smbconf == NULL) {
smbconf = lp_default_path();
}
if (ctx == NULL) {
DBG_ERR("talloc_new failed\n");
return;
}
/*
* Check if gpupdate is enabled for winbind, if not
* return without applying user policy.
*/
if (!lpcfg_apply_group_policies(lp_ctx)) {
return;
}
/*
* Execute gpupdate for the user immediately.
* TODO: This should be scheduled to reapply every 90 to 120 minutes.
* Logoff will need to handle cancelling these events though, and
* multiple timers cannot be run for the same user, even if there are
* multiple active sessions.
*/
req = samba_runcmd_send(ctx, global_event_context(),
timeval_zero(), 2, 0,
gpupdate_cmd,
"-s",
smbconf,
"--target=User",
"-U",
user,
NULL);
if (req == NULL) {
DBG_ERR("Failed to execute the gpupdate command\n");
return;
}
tevent_req_set_callback(req, gpupdate_cmd_done, NULL);
}
static void gpupdate_cmd_done(struct tevent_req *subreq)
{
int sys_errno;
int ret;
ret = samba_runcmd_recv(subreq, &sys_errno);
TALLOC_FREE(subreq);
if (ret != 0) {
DBG_ERR("gpupdate failed with exit status %d\n", sys_errno);
}
}
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