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INSTALLING AND SETUPING ASTERISK FAIL2BAN IN LINUX/CENTOS SERVER



Step 1 : 

Install fail2ban in your server. Installation steps are described in http://ijasnahamed.blogspot.in/2015/03/install-and-setup-fail2ban-in.html from step 1 to step 6.

Step 2 : 

Open jail.local file

vi /etc/fail2ban/jail.local

Step 3 :

In this file , under asterisk-iptables heading, it will be shown like this as below

[asterisk-iptables]

enabled  = false
filter   = asterisk
action   = iptables-allports[name=ASTERISK, protocol=all]
           sendmail-whois[name=Asterisk, dest=you@example.com, sender=fail2ban@example.com]
logpath  = /var/log/asterisk/messages
maxretry = 5

or you may have

[asterisk]

enabled  = false
filter   = asterisk
action   = iptables-multiport[name=asterisk-tcp, port="5060,5061", protocol=tcp]
           iptables-multiport[name=asterisk-udp, port="5060,5061", protocol=udp]
           sendmail-whois[name=Asterisk, dest=you@example.com, sender=fail2ban@example.com]
logpath  = /var/log/asterisk/messages
maxretry = 10

Edit this to have parameters with following values ,

[asterisk]

enabled  = true
filter   = asterisk
action   = iptables-allports[name=ASTERISK, protocol=all]
           sendmail-whois[name=Asterisk, dest=you@example.com, sender=fail2ban@example.com]
logpath  = /var/log/asterisk/messages
maxretry = 5

You can check the name of the log file in /etc/asterisk/logger.conf.

Generally , logpath = /var/log/asterisk/messages is for vanilla asterisk, use logpath = /var/log/asterisk/full for freepbx.

Step 4 : 

Now restart fail2ban

sudo service fail2ban restart

Step 5 :

 U can verify if asterisk fail2ban  is successfully started its service by typing this command

iptables -L

It will show like this if fail2ban for asterisk is successfullt installed.

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
fail2ban-ASTERISK  all  --  anywhere             anywhere
fail2ban-SSH  tcp  --  anywhere             anywhere            tcp dpt:ssh

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain fail2ban-ASTERISK (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

Chain fail2ban-SSH (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

Step 6 :

You can set your fail2ban reg expression.

cd filter.d/
vi asterisk.conf

Please do include following failregex expression in asterisk.conf file.


failregex = ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Registration from '[^']*' failed for '<HOST>(:\d+)?' - (Wrong password|Username/auth name mismatch|No matching peer found|Not a local domain|Device does not match ACL|Peer is not supposed to register|ACL error \(permit/deny\)|Not a local domain)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Call from '[^']*' \(<HOST>:\d+\) to extension '\d+' rejected because extension not found in context 'default'\.$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Host <HOST> failed to authenticate as '[^']*'$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s No registration for peer '[^']*' \(from <HOST>\)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Host <HOST> failed MD5 authentication for '[^']*' \([^)]+\)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Failed to authenticate (user|device) [^@]+@<HOST>\S*$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s (?:handle_request_subscribe: )?Sending fake auth rejection for (device|user) \d*<sip:[^@]+@<HOST>>;tag=\w+\S*$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s SecurityEvent="(FailedACL|InvalidAccountID|ChallengeResponseFailed|InvalidPassword)",EventTV="[\d-]+",Severity="[\w]+",Service="[\w]+",EventVersion="\d+",AccountID="\d*",SessionID="0x[\da-f]+",LocalAddress="IPV[46]/(UD|TC)P/[\da-fA-F:.]+/\d+",RemoteAddress="IPV[46]/(UD|TC)P/<HOST>/\d+"(,Challenge="\w+",ReceivedChallenge="\w+")?(,ReceivedHash="[\da-f]+")?(,ACLName="\w+")?$
            ^(%(__prefix_line)s|\[\]\s*WARNING%(__pid_re)s:?(?:\[C-[\da-f]*\])? )Ext\. s: "Rejecting unknown SIP connection from <HOST>"$

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