/usr/share/igtf-policy/classic/CNRS2-Projets.namespaces is in igtf-policy-classic 1.59-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#NAMESPACES-VERSION: 1.0
#
# @(#)09ff08b7.signing_policy.namespaces
# CA alias    : CNRS2-Projets
#    subord_of: CNRS2
#    subjectDN: /C=FR/O=CNRS/CN=CNRS2-Projets
#    hash     : 09ff08b7.signing_policy
#    (generated automatically from 09ff08b7.signing_policy)
#
TO Issuer "/C=FR/O=CNRS/CN=CNRS2-Projets" \
  PERMIT Subject "/C=FR/O=CNRS/CN=GRID2-FR"
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