FAIL2BAN(1) General Commands Manual FAIL2BAN(1)
NAME
fail2ban - a set of server and client programs to limit brute force au-
thentication attempts.
DESCRIPTION
Fail2Ban consists of a client, server and configuration files to limit
brute force authentication attempts.
The server program fail2ban-server is responsible for monitoring log
files and issuing ban/unban commands. It gets configured through a sim-
ple protocol by fail2ban-client, which can also read configuration files
and issue corresponding configuration commands to the server.
For details on the configuration of fail2ban see the jail.conf(5) manual
page. A jail (as specified in jail.conf) couples filters and actions
definitions for any given list of files to get monitored.
For details on the command-line options of fail2ban-server see the
fail2ban-server(1) manual page.
For details on the command-line options and commands for configuring the
server via fail2ban-client see the fail2ban-client(1) manual page.
For testing regular expressions specified in a filter using the
fail2ban-regex program may be of use and its manual page is fail2ban-
regex(1).
LIMITATION
Fail2Ban is able to reduce the rate of incorrect authentications at-
tempts however it cannot eliminate the risk that weak authentication
presents. Configure services to use only two factor or public/private
authentication mechanisms if you really want to protect services.
A local user is able to inject messages into syslog and using a Fail2Ban
jail that reads from syslog, they can effectively trigger a DoS attack
against any IP. Know this risk and configure Fail2Ban/grant shell access
accordingly.
FILES
/etc/fail2ban/*
AUTHOR
Manual page written by Daniel Black and Yaroslav Halchenko
REPORTING BUGS
Report bugs to https://github.com/fail2ban/fail2ban/issues
COPYRIGHT
Copyright © 2013
Copyright of modifications held by their respective authors. Licensed
under the GNU General Public License v2 (GPL).
SEE ALSO
fail2ban-server(1) fail2ban-client(1) fail2ban-regex(1) jail.conf(5)
Fail2Ban March 2013 FAIL2BAN(1)
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