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authorLennart Poettering <lennart@poettering.net>2014-05-06 18:08:04 +0200
committerLennart Poettering <lennart@poettering.net>2014-05-06 18:08:04 +0200
commit661278ee297247c0c7e0708924f8ce52284529fc (patch)
tree3354d9078f6709887e827714ffb1657de0dbc279
parentdfdb269daf539470c6bcf232a58c6cd1e4492fc8 (diff)
timesyncd: never accept NTP time from server that is older than systemd's release time
-rw-r--r--configure.ac9
-rw-r--r--src/timesync/timesyncd.c8
2 files changed, 16 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 318d77b302..972fc2f6bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -836,6 +836,14 @@ AC_ARG_WITH(ntp-servers,
AC_DEFINE_UNQUOTED(NTP_SERVERS, ["$NTP_SERVERS"], [Default NTP Servers])
AC_SUBST(NTP_SERVERS)
+AC_ARG_WITH(time-epoch,
+ AS_HELP_STRING([--with-time-epoch=SECONDS],
+ [TIme epoch for time clients]),
+ [TIME_EPOCH="$withval"],
+ [TIME_EPOCH="`stat -c %Y ${srcdir}/NEWS 2>/dev/null || echo 0`"])
+
+AC_DEFINE_UNQUOTED(TIME_EPOCH, [$TIME_EPOCH], [Time Epoch])
+
# ------------------------------------------------------------------------------
have_localed=no
AC_ARG_ENABLE(localed, AS_HELP_STRING([--disable-localed], [disable locale daemon]))
@@ -1169,6 +1177,7 @@ AC_MSG_RESULT([
timedated: ${have_timedated}
timesyncd: ${have_timesyncd}
default NTP servers: ${NTP_SERVERS}
+ time epoch: ${TIME_EPOCH}
localed: ${have_localed}
networkd: ${have_networkd}
coredump: ${have_coredump}
diff --git a/src/timesync/timesyncd.c b/src/timesync/timesyncd.c
index 6e38a2cb89..dabad5e196 100644
--- a/src/timesync/timesyncd.c
+++ b/src/timesync/timesyncd.c
@@ -573,12 +573,18 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
m->event_timeout = sd_event_source_unref(m->event_timeout);
+ if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 ||
+ be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) {
+ log_debug("Invalid reply, returned times before epoch. Ignoring.");
+ return manager_connect(m);
+ }
+
if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC) {
log_debug("Server is not synchronized. Disconnecting.");
return manager_connect(m);
}
- if (NTP_FIELD_VERSION(ntpmsg.field) != 4 && NTP_FIELD_VERSION(ntpmsg.field) != 3) {
+ if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) {
log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field));
return manager_connect(m);
}