Sshguard monitors services through their logging activity. It reacts to messages about dangerous activity by blocking the source address with the local firewall. Sshguard employs a clever parser that can transparently recognize several logging formats at once (syslog, syslog-ng, metalog, multilog, raw messages), and detects attacks for many services out of the box, including SSH, several ftpds, and dovecot. It can operate all the major firewalling systems, and features support for IPv6, whitelisting, suspension, and log message authentication.
| Tags | Networking Firewalls Monitoring Security Systems Administration |
|---|---|
| Licenses | BSD Revised |
| Operating Systems | POSIX |
| Implementation | C |
Recent releases


Changes: With respect to 1.5beta3, this release completes support for IPv6 by adding support for CIDR-based IPv6 whitelisting and whitelisting of both IPv4 and IPv6 addresses when adding hosts. IPv4-mapped IPv6 addresses are passed to backend firewalls as IPv4. This is the last release that adds features for 1.5. The next releases will only fix bugs until 1.5 stable.


Changes: Sshguard now recognizes "last message repeated N times" messages, contextually and per-source. Attackers are now gauged with dangerousness instead of attack counts by adjusting the '-a' option. Support for Sendmail relaying abuse and for vsftpd authentication failure messages has been added. The recognition of messages of Gentoo's PAM implementation for authentication failure has been added.


Changes: The Log Sucker has been extended to handle volatile files. Support was included for new attack patterns from Exim and cucipop. The recognition of certain IPv6 addresses has been corrected.


Changes: This release is capable of monitoring many log files at once without relying on logging systems such as syslog. It introduces a number of other fixes and improvements.


Changes: This release includes many new features (touchiness, automatic permanent blacklisting, IPv6 whitelisting, and more), many bugfixes to the logic, and some fixes and additions to the log analyzer.
An extendable extract-transform-load tool where jobs are Perl or Java scripts.
A simple program to convert Shell Scrap Object Files (.shs) to Rich Text Format.