Changed files:
xserver.pamd -> 1.2
#%PAM-1.0
-auth sufficient /lib/security/pam_rootok.so
-auth required /lib/security/pam_console.so
-account required /lib/security/pam_permit.so
+auth required /lib/security/pam_listfile.so item=user sense=deny file=/etc/security/blacklist onerr=succeed
+auth required /lib/security/pam_listfile.so item=user sense=deny file=/etc/security/blacklist.xserver onerr=succeed
+auth sufficient /lib/security/pam_rootok.so
+auth required /lib/security/pam_console.so
+account required /lib/security/pam_permit.so