This file is indexed.

/etc/pam.d/ftp is in ftpd 0.17-34.

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

The actual contents of the file can be viewed below.

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# Standard behaviour for ftpd(8).
auth	required	pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed

# This line is required by ftpd(8).
auth	sufficient	pam_ftp.so

# Uncomment this to achieve what used to be ftpd -A.
#auth	required	pam_listfile.so item=user sense=allow file=/etc/ftpchroot onerr=fail

# Standard blurb.
@include common-auth
@include common-account
@include common-session