/usr/lib/firewalld/helpers/ftp.xml is in firewalld 0.4.4.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | <?xml version="1.0" encoding="utf-8"?>
<helper module="nf_conntrack_ftp">
<port protocol="tcp" port="21"/>
</helper>
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