1 files changed, 117 insertions, 0 deletions
diff --git a/source3/winbindd/winbindd_gpupdate.c b/source3/winbindd/winbindd_gpupdate.c
new file mode 100644
index 0000000..1032251
--- /dev/null
+++ b/source3/winbindd/winbindd_gpupdate.c
@@ -0,0 +1,117 @@
+/*
+ * 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 mutiple
+ * 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_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 = 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;
+	}
+
+	/* 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"));
+	}
+}
+