A Stateful Packet Inspection (SPI) firewall, Login/Intrusion Detection and Security application for Linux servers.
(* may require custom regex patterns for some functions) |
(** requires correct iptables configuration on host server) |
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This suite of scripts provides:
- Straight-forward SPI iptables firewall script
- Daemon process that checks for login authentication failures for:
- Courier imap, Dovecot, uw-imap, Kerio
- openSSH
- cPanel, WHM, Webmail (cPanel servers only)
- Pure-pftd, vsftpd, Proftpd
- Password protected web pages (htpasswd)
- Mod_security failures (v1 and v2)
- Suhosin failures
- Exim SMTP AUTH
- Custom login failures with separate log file and regular expression matching
- POP3/IMAP login tracking to enforce logins per hour
- SSH login notification
- SU login notification
- Excessive connection blocking
- UI Integration for cPanel, DirectAdmin and Webmin
- Easy upgrade between versions from within cPanel/WHM, DirectAdmin or Webmin
- Easy upgrade between versions from shell
- Pre-configured to work on a cPanel server with all the standard cPanel ports open
- Pre-configured to work on a DirectAdmin server with all the standard DirectAdmin ports open
- Auto-configures the SSH port if it's non-standard on installation
- Block traffic on unused server IP addresses - helps reduce the risk to your server
- Alert when end-user scripts sending excessive emails per hour - for identifying spamming scripts
- Suspicious process reporting - reports potential exploits running on the server
- Excessive user processes reporting
- Excessive user process usage reporting and optional termination
- Suspicious file reporting - reports potential exploit files in /tmp and similar directories
- Directory and file watching - reports if a watched directory or a file changes
- Block traffic on the DShield Block List and the Spamhaus DROP List
- BOGON packet protection
- Pre-configured settings for Low, Medium or High firewall security (cPanel servers only)
- Works with multiple ethernet devices
- Server Security Check - Performs a basic security and settings check on the server (via cPanel/DirectAdmin/Webmin UI)
- Allow Dynamic DNS IP addresses - always allow your IP address even if it changes whenever you connect to the internet
- Alert sent if server load average remains high for a specified length of time
- mod_security log reporting (if installed)
- Email relay tracking - tracks all email sent through the server and issues alerts for excessive usage (cPanel servers only)
- IDS (Intrusion Detection System) - the last line of detection alerts you to changes to system and application binaries
- SYN Flood protection
- Ping of death protection
- Port Scan tracking and blocking
- Permanent and Temporary (with TTL) IP blocking
- Exploit checks
- Account modification tracking - sends alerts if an account entry is modified, e.g. if the password is changed or the login shell
- Shared syslog aware
- New in v4: Messenger Service - Allows you to redirect connection requests from blocked IP addresses to preconfigured text and html pages to inform the visitor that they have been blocked in the firewall. This can be particularly useful for those with a large user base and help process support requests more efficiently
- New in v4: Country Code blocking - Allows you to deny or allow access by ISO Country Code
- New in v4: Port Flooding Detection - Per IP, per Port connection flooding detection and mitigation to help block DOS attacks
- New in v4: DirectAdmin UI integration
- New in v4: Updated Webmin UI integration
- New in v4: WHM root access notification (cPanel servers only)
- ...lots more!
The reason we have developed this suite is that we have found over the years of providing server services that many of the tools available for the task are either over-complex, not user friendly, or simply aren't as effective as they could be.
ConfigServer Firewall (csf)
We have developed an SPI iptables firewall that is comprehensive, straight-forward, easy and flexible to configure
Download
The latest version of csf can be downloaded here: csf.tgz
Login Failure Daemon (lfd)
To complement the ConfigServer Firewall (csf), we have developed a Login Failure Daemon (lfd) process that runs all the time and periodically (every X seconds) scans the latest log file entries for login attempts against your server that continually fail within a short period of time. Such attempts are often called "Brute-force attacks" and the daemon process responds very quickly to such patterns and blocks offending IP's quickly. Other similar products run every x minutes via cron and as such often miss break-in attempts until after they've finished, our daemon eliminates such long waits and makes it much more effective at performing its task.
Login tracking is an extension of lfd, it keeps track of POP3 and IMAP logins and limits them to X connections per hour per account per IP address.
Control Panel Configuration Interface
To help with the ease and flexibility of the suite we have developed a front-end to both csf and lfd which is accessible by the root account through cPanel, DirectAdmin and Webmin. From there you can modify the configuration files and stop, start and restart the applications and check their status. This makes configuring and managing the firewall very simple indeed.
Sample Pages
Messenger HTML sample redirect page
Support
Please visit our ConfigServer Scripts Forum
Licensing
This application is released under our script license. It is released free of charge, with no warranty to its suitability. There is no support provided with this application except through our online help forums.
While we are happy to provide these scripts for free, we are a very small company. If you do decide to use them, we'd be eternally grateful for any donation you think might express your gratitude so that we can continue to develop and provide them:
That's it. If you don't feel confident doing any of this yourself, or if you get into a horrible mess, we do have cPanel Server Services that include the installation and configuration of this firewall.
Documentation
Third Party Plugins
WHMCS Plugins Released by Ichthys Media using csf: