/usr/share/igtf-policy/classic/COMODO-RSA-CA.signing_policy is in igtf-policy-classic 1.79-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | access_id_CA X509 '/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority'
pos_rights globus CA:sign
cond_subjects globus '"/C=US/O=Internet2/OU=InCommon/CN=InCommon IGTF Server CA"'
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