Index: squid-5.2/tools/systemd/squid.service
===================================================================
--- squid-5.2.orig/tools/systemd/squid.service
+++ squid-5.2/tools/systemd/squid.service
@@ -11,6 +11,19 @@ Documentation=man:squid(8)
 After=network.target network-online.target nss-lookup.target
 
 [Service]
+# added automatically, for details please see
+# https://en.opensuse.org/openSUSE:Security_Features#Systemd_hardening_effort
+ProtectSystem=full
+ProtectHome=true
+PrivateDevices=true
+ProtectHostname=true
+ProtectClock=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectKernelLogs=true
+ProtectControlGroups=true
+RestrictRealtime=true
+# end of automatic additions 
 Type=notify
 PIDFile=/var/run/squid.pid
 ExecStartPre=/usr/sbin/squid --foreground -z