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FreeBSD - SSHGuard

http://www.sshguard.net/

SSHGuard adalah salah satu tools yang ada di ports untuk melindungi ssh servis anda dari diserang secara bruteforce. Ia menggunakan sistem log dari syslog untuk mengesan IP yang gagal untuk login ke server.

- Install dari ports

proxy# /usr/ports/security/sshguard-pf
proxy# make install clean

- Konfigurasi PF
shell> nano /etc/pf.conf


#di bahagian table
table "" persist #sila buang "", <> tak boleh :P

#bahagian block rules
block in quick on $ext_if proto tcp from to any port 22 label "ssh bruteforce"

- Aktifkan rules pf yang baru
shell> pfctl -ef /etc/pf.conf

- Edit /etc/syslog.conf
uncomment line yang berkenaan sshguard

proxy# nano /etc/syslog.conf
GNU nano 2.0.9 File: /etc/syslog.conf


# $FreeBSD: src/etc/syslog.conf,v 1.28.20.1 2009/04/15 03:14:26 kensmith Exp $
#
# Spaces ARE valid field separators in this file. However,
# other *nix-like systems still insist on using tabs as field
# separators. If you are sharing this file between systems, you
# may want to use only tabs as field separators here.
# Consult the syslog.conf(5) manpage.
auth.info;authpriv.info |exec /usr/local/sbin/sshguard
*.err;kern.warning;auth.notice;mail.crit /dev/console
*.notice;authpriv.none;kern.debug;lpr.info;mail.crit;news.err /var/log/messages
security.* /var/log/security
auth.info;authpriv.info /var/log/auth.log
mail.info /var/log/maillog
lpr.info /var/log/lpd-errs
ftp.info /var/log/xferlog
cron.* /var/log/cron
*.=debug /var/log/debug.log
*.emerg *
# uncomment this to log all writes to /dev/console to /var/log/console.log
#console.info /var/log/console.log
# uncomment this to enable logging of all log messages to /var/log/all.log
# touch /var/log/all.log and chmod it to mode 600 before it will work
#*.* /var/log/all.log
# uncomment this to enable logging to a remote loghost named loghost
#*.* @loghost
# uncomment these if you're running inn
# news.crit /var/log/news/news.crit
# news.err /var/log/news/news.err
# news.notice /var/log/news/news.notice
!startslip
*.* /var/log/slip.log
!ppp
*.* /var/log/ppp.log

- Aktifkan konfigurasi syslog yang baru

shell> /etc/rc.d/syslogd reload

- Untuk mencuba sila login dengan username yang salah secara berturut menggunakan host yang berlainan dari pc anda yang remote secara terus ke server, ia bagi mengelakkan pc anda di block terus dan tidak dapat diakses sama sekali.

- Untuk melihat table PF bagi IP yang sudah di block, boleh menggunakan pfctl

shell> pfctl -Ts how -t sshguard
No ALTQ support in kernel
ALTQ related functions disabled
200.200.200.199

- Untuk delete IP yang diblock boleh juga menggunakan pfctl

shell> pfctl -t sshguard -T delete 200.200.200.119
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