Package: fail2ban
Version: 0.8.3-2sid1
Severity: wishlist
Hi there,
I've been using Fail2Ban with an added filter for dropbear, adapted from
Francis Russell's Uncharted Backwaters.[0] The linked file requires a
patch[1] to dropbear for it to work (hence a CC to the dropbear
maintainer,) although there is a ruleset for the unpatched version,
albeit commented out.
[0] http://www.unchartedbackwaters.co.uk/files/dropbear/dropbear.conf
Attached is the filter rule I'm currently using, against unpatched
dropbear. I modified the rule a bit so that it works.
-- System Information:
Debian Release: 5.0.3
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.18-128.2.1.el5.028stab064.7 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash
Versions of packages fail2ban depends on:
ii lsb-base 3.2-20 Linux Standard Base 3.2 init scrip
ii python 2.5.2-3 An interactive high-level object-o
ii python-central 0.6.8 register and build utility for Pyt
Versions of packages fail2ban recommends:
ii iptables 1.4.2-6 administration tools for packet fi
ii whois 4.7.30 an intelligent whois client
Versions of packages fail2ban suggests:
ii bsd-mailx [mailx] 8.1.2-0.20071201cvs-3 A simple mail user agent
ii mailx 1:20071201-3 Transitional package for mailx ren
pn python-gamin <none> (no description available)
-- no debconf information
# Fail2Ban configuration file
#
# Author: Francis Russell
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf
[Definition]
_daemon = dropbear
# Option: failregex
# Notes.: regex to match the password failures messages in the logfile. The
# host must be matched by a group named "host". The tag "<HOST>" can
# be used for standard IP/hostname matching and is only an alias for
# (?:::f{4,6}:)?(?P<host>\S+)
# Values: TEXT
# These match the unmodified dropbear messages. It isn't possible to match the
source of the
# 'exit before auth' messages from dropbear.
#
failregex = ^%(__prefix_line)slogin attempt for nonexistent user ('.*' )?from
<HOST>:.*\s*$
^%(__prefix_line)sbad password attempt for .+ from <HOST>:.*\s*$
# The only line we need to match with the modified dropbear.
# failregex = ^%(__prefix_line)sexit before auth from <HOST>.*\s*$
# Option: ignoreregex
# Notes.: regex to ignore. If this regex matches, the line is ignored.
# Values: TEXT
#
ignoreregex =
