units: further lock down our long-running services

Let's make this an excercise in dogfooding: let's turn on more security
features for all our long-running services.

Specifically:

- Turn on RestrictRealtime=yes for all of them

- Turn on ProtectKernelTunables=yes and ProtectControlGroups=yes for most of
  them

- Turn on RestrictAddressFamilies= for all of them, but different sets of
  address families for each

Also, always order settings in the unit files, that the various sandboxing
features are close together.

Add a couple of missing, older settings for a numbre of unit files.

Note that this change turns off AF_INET/AF_INET6 from udevd, thus effectively
turning of networking from udev rule commands. Since this might break stuff
(that is already broken I'd argue) this is documented in NEWS.

1 files changed, 5 insertions, 1 deletions

diff --git a/units/systemd-timedated.service.in b/units/systemd-timedated.service.in
index bc1795d747..e8c4d5ed4b 100644
--- a/units/systemd-timedated.service.in
+++ b/units/systemd-timedated.service.in
@@ -13,10 +13,14 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/timedated
 [Service]
 ExecStart=@rootlibexecdir@/systemd-timedated
 BusName=org.freedesktop.timedate1
-CapabilityBoundingSet=CAP_SYS_TIME
 WatchdogSec=3min
+CapabilityBoundingSet=CAP_SYS_TIME
 PrivateTmp=yes
 ProtectSystem=yes
 ProtectHome=yes
+ProtectControlGroups=yes
+ProtectKernelTunables=yes
 MemoryDenyWriteExecute=yes
+RestrictRealtime=yes
+RestrictAddressFamilies=AF_UNIX
 SystemCallFilter=~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io