/usr/share/igtf-policy/classic/IGCA.namespaces is in igtf-policy-classic 1.88-1.
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
#
# @(#)da75f6a8.signing_policy.namespaces
# CA alias    : IGCA
#    subord_of: 
#    subjectDN: /DC=IN/DC=GARUDAINDIA/CN=Indian Grid Certification Authority
#    hash     : da75f6a8.signing_policy
#    (generated automatically from da75f6a8.signing_policy)
#
TO Issuer "/DC=IN/DC=GARUDAINDIA/CN=Indian Grid Certification Authority" \
  PERMIT Subject "/DC=IN/DC=GARUDAINDIA/.*"
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