CSF - Core Shield Firewall
Copyright (C) 2026 UnderHost (https://underhost.com)

CSF - Core Shield Firewall (formerly "cPanel Shield Firewall") is a
next-generation fork of ConfigServer Security & Firewall (CSF), originally
written by Way to the Web Ltd. (ConfigServer) and distributed under the
GNU General Public License version 3. The CSF name, the csf.conf / csf.allow /
csf.deny / csf.ignore file model and the Login Failure Daemon (LFD) concept
come from that project. CSF 2.x is a rewrite on native nftables.

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version. See the LICENSE file for the full text.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.

Third-party data used at run time (downloaded by the server, not included in
this repository):
  - Spamhaus DROP / EDROP, abuse.ch Feodo Tracker, CINS Army, IPsum and
    Blocklist.de reputation feeds (Threat Intelligence; each under its own terms)
  - R-fx Networks Linux Malware Detect (rfxn) signatures, GPL-2.0
  - YARA-Forge rule packages, under the licenses of their individual rules
  - ClamAV and YARA are installed from the operating system's repositories

Trademarks: cPanel and WHM are registered trademarks of cPanel, L.L.C.
CloudPanel is a trademark of its owner. UnderHost, UnderShield and CSF are not
affiliated with or endorsed by cPanel, L.L.C. or ConfigServer.
