/etc/ipsec.d/policies/private is in libreswan 3.23-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # This file defines the set of CIDRs (network/mask-length) to which
# communication should always be private (i.e. encrypted). One IPv4
# or IPv6 CIDR per line.
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