This file is indexed.

/usr/share/pam-configs/duo-unix is in libpam-duo 1.7-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Name: Duo Security two-factor authentication
Default: no
Priority: 100
Auth-Type: Additional
Auth:
	[success=ok default=bad]		pam_duo.so