activate authentication

etc/xrootd/auth_db

+# GD taken from https://twiki.cern.ch/twiki/bin/view/AtlasComputing/Tier3gXrootdSetup
+# This means that all the users have read access to the datasets
+#u * /atlas lr
+u * / lr

etc/xrootd/xcache.cfg

@@ -47,13 +47,13 @@ pfc.prefetch 0
 pfc.trace debug
 
 # Uncomment the following and bind mount to request GSI security from client
-# xrootd.seclib /usr/lib64/libXrdSec.so
-# sec.protparm gsi -vomsfun:/usr/lib64/libXrdSecgsiVOMS.so -vomsfunparms:certfmt=raw|vos=atlas|grps=/atlas
-# # Note: The certificate/key files must be readable by the xrootd daemon (ACLs might be used for this).
-# sec.protocol /usr/lib64 gsi -ca:1 -crl:3 -cert:/etc/grid-security/hostcert.pem -key:/etc/grid-security/hostkey.pem
-# acc.authdb /etc/xrootd/auth_db
-# acc.authrefresh 60
-# ofs.authorize
+xrootd.seclib /usr/lib64/libXrdSec.so
+sec.protparm gsi -vomsfun:/usr/lib64/libXrdSecgsiVOMS.so -vomsfunparms:certfmt=raw|vos=atlas|grps=/atlas
+# Note: The certificate/key files must be readable by the xrootd daemon (ACLs might be used for this).
+sec.protocol /usr/lib64 gsi -ca:1 -crl:3 -cert:/etc/grid-security/hostcert.pem -key:/etc/grid-security/hostkey.pem
+acc.authdb /etc/xrootd/auth_db
+acc.authrefresh 60
+ofs.authorize
 
 # resolving bug in v5 rc4 (TODO: check if still needed)
 xrootd.async nosf