/usr/share/igtf-policy/mics/cilogon-silver.crl_url is in igtf-policy-mics 1.88-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | http://crl-cilogon.ncsa-security.net/cilogon-silver.crl
http://crl.cilogon.org/cilogon-silver.crl
|