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Intelligently block brute-force attacks by aggregating system logs
SSHGuard protects hosts from brute-force attacks against SSH and other services. It aggregates system logs and blocks repeat offenders using several firewall backends, including iptables, ipfw, and pf.
DenyHosts is a python program that automatically blocks ssh attacks by adding entries to /etc/hosts.deny.
DenyHosts will also inform Linux administrators about offending hosts, attacked users and suspicious logins.
This project is being actively developed on GitHub (https://github.com/denyhosts)
Kojoney is an easy of use, secure, robust and powerfull Honeypot for the SSH Service written in Python. With the kojoney daemon are distributeds other tools such as kip2country (IP to Country) and kojreport, a tool to generate reports from the log fi
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fwblocker is a script used to parse syslog files for SSH, pure-ftpd and iptables entries. It will generate statistics but it's main feature is to lock out IP addresses that used a wrong username/password to log into your SSH or FTP Server.
Logrep is a tool for collection and presentation of information from various logfiles including snort, squid, postfix, apache, sendmail, iptables/ipchains and nt eventlogs. HTML-reports, multi dimensional analysis, ssh and graphs are available.