timedated: refuse manual system time updates when automatic timesync is enabled

1 files changed, 13 insertions, 33 deletions

diff --git a/src/timedate/timedated.c b/src/timedate/timedated.c
index 0e74c25b05..204031fe77 100644
--- a/src/timedate/timedated.c
+++ b/src/timedate/timedated.c
@@ -37,6 +37,7 @@
 #include "fileio-label.h"
 #include "label.h"
 #include "bus-util.h"
+#include "bus-errors.h"
 #include "event-util.h"
 
 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
@@ -45,25 +46,15 @@
 typedef struct Context {
         char *zone;
         bool local_rtc;
-        unsigned can_ntp;
-        unsigned use_ntp;
+        bool can_ntp;
+        bool use_ntp;
         Hashmap *polkit_registry;
 } Context;
 
-static void context_reset(Context *c) {
-        assert(c);
-
-        free(c->zone);
-        c->zone = NULL;
-
-        c->local_rtc = false;
-        c->can_ntp = c->use_ntp = -1;
-}
-
 static void context_free(Context *c, sd_bus *bus) {
         assert(c);
 
-        context_reset(c);
+        free(c->zone);
         bus_verify_polkit_async_registry_free(bus, c->polkit_registry);
 }
 
@@ -121,8 +112,6 @@ static int context_read_data(Context *c) {
 
         assert(c);
 
-        context_reset(c);
-
         r = readlink_malloc("/etc/localtime", &t);
         if (r < 0) {
                 if (r == -EINVAL)
@@ -323,18 +312,12 @@ static int context_read_ntp(Context *c, sd_bus *bus) {
                 if (r < 0)
                         return r;
 
-                c->can_ntp = 1;
-                c->use_ntp =
-                        streq(s, "enabled") ||
-                        streq(s, "enabled-runtime");
+                c->can_ntp = true;
+                c->use_ntp = STR_IN_SET(s, "enabled", "enabled-runtime");
 
                 return 0;
         }
 
-        /* NTP is not installed. */
-        c->can_ntp = 0;
-        c->use_ntp = 0;
-
         return 0;
 }
 
@@ -664,6 +647,9 @@ static int method_set_time(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bu
         assert(m);
         assert(c);
 
+        if (c->use_ntp)
+                return sd_bus_error_setf(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Automatic time synchronization is enabled");
+
         r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
         if (r < 0)
                 return r;
@@ -756,9 +742,9 @@ static int method_set_ntp(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus
 static const sd_bus_vtable timedate_vtable[] = {
         SD_BUS_VTABLE_START(0),
         SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
-        SD_BUS_PROPERTY("LocalRTC", "b", NULL, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
-        SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_tristate, offsetof(Context, can_ntp), 0),
-        SD_BUS_PROPERTY("NTP", "b", bus_property_get_tristate, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+        SD_BUS_PROPERTY("LocalRTC", "b", bus_property_get_bool, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+        SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_bool, offsetof(Context, can_ntp), 0),
+        SD_BUS_PROPERTY("NTP", "b", bus_property_get_bool, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
         SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
         SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
@@ -808,13 +794,7 @@ static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 }
 
 int main(int argc, char *argv[]) {
-        Context context = {
-                .zone = NULL,
-                .local_rtc = false,
-                .can_ntp = -1,
-                .use_ntp = -1,
-        };
-
+        Context context = {};
         _cleanup_event_unref_ sd_event *event = NULL;
         _cleanup_bus_unref_ sd_bus *bus = NULL;
         int r;