This file is indexed.

/etc/strongswan.d/charon/xauth-pam.conf is in libcharon-extra-plugins 5.5.1-4+deb9u4.

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

The actual contents of the file can be viewed below.

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xauth-pam {

    # Whether to load the plugin. Can also be an integer to increase the
    # priority of this plugin.
    load = yes

    # PAM service to be used for authentication.
    # pam_service = login

    # Open/close a PAM session for each active IKE_SA.
    # session = no

    # If an email address is received as an XAuth username, trim it to just the
    # username part.
    # trim_email = yes

}