[Freeswitch-users] Getting fail2ban working properly

Angel Elena craem at craem.net
Thu Sep 8 11:50:28 MSD 2016


fail2ban (only) is a bad idea to protect a freeswitch / sip server.

If you have the server with 5060 NATed or published directly to internet, is better or add a layer 7 security.

The SIP-boot networks are managed by SipVicious / SipVAx / Ozeeki softs...... fail2ban + iptables layer 7 security is best option.... who ?


# Generated by iptables-save
*filter
:INPUT ACCEPT [541:131352]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [528:125051]
:SIPDOS - [0:0]
-A INPUT -p udp -m udp --dport 5060 -m string --string "VoIP v11.2.4" --algo bm --to 65535 -m comment --comment "deny sundayddr" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "sundayddr" --algo bm --to 65535 -m comment --comment "deny sundayddr" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "sipsak" --algo bm --to 65535 -m comment --comment "deny sipsak" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "sipvicious" --algo bm --to 65535 -m comment --comment "deny sipvicious" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "friendly-scanner" --algo bm --to 65535 -m comment --comment "deny friendly-scanner" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "iWar" --algo bm --to 65535 -m comment --comment "deny iWar" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "sip-scan" --algo bm --to 65535 -m comment --comment "deny sip-scan" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "sundayddr" --algo bm --to 65535 -m comment --comment "deny sundayddr" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "sipsak" --algo bm --to 65535 -m comment --comment "deny sipsak" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "sipvicious" --algo bm --to 65535 -m comment --comment "deny sipvicious" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "friendly-scanner" --algo bm --to 65535 -m comment --comment "deny friendly-scanner" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "iWar" --algo bm --to 65535 -m comment --comment "deny iWar" -j SIPDOS
-A INPUT -p tcp -m tcp --dport 5060 -m string --string "sipcli" --algo bm --to 65535 -m comment --comment "deny sipcli" -j SIPDOS
-A INPUT -p udp -m udp --dport 5060 -m string --string "VaxSIPUserAgent/3.1" --algo bm --to 65535 -m comment --comment "deny VaxSip" -j SIPDOS
-A SIPDOS -j LOG --log-prefix "firewall-sipdos: " --log-level 6
-A SIPDOS -j DROP

COMMIT
# Completed 

--------------------------------
Ángel Elena Medina       _o)
craem at craem.net          / \\
http://blog.craem.net  _(___V
@craem_
--------------------------------

-----Mensaje original-----
De:	Mirko Brankovic <mirkobrankovic at gmail.com>
Enviado:	Jue 08-09-2016 08:56
Asunto:	Re: [Freeswitch-users] Getting fail2ban working properly
Para:	FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>; 
> On ubuntu it is called :
> Chain fail2ban-freeswitch (1 references)
> 
> iptables -L should give you the chain if F2B started correctly, otherwise see 
> the fail2ban log for errors.
> 
> 
> 
> On Thu, Sep 8, 2016 at 7:42 AM, Jurijs Ivolga <jurijs.ivolga at gmail.com 
> <mailto:jurijs.ivolga at gmail.com> > wrote:
> Hi,
> 
> I configured fail2ban several times a while ago, but not with freeswitch...
> 
> If you see that rules are missing, just add them and you can use SSH rules as 
> template. I believe it should make a trick.
> 
> And I see from you rules, that you are allowing all traffic and this is really 
> bad idea...
> 
> You should drop everything and allow only needed traffic.
> 
> With kind regards,
> 
> Jurijs
> 
> On Thu, Sep 8, 2016 at 12:15 AM, Don Hawkins <hawkins at hawkinsegroup.com 
> <mailto:hawkins at hawkinsegroup.com> > wrote:
> Thanks for the reply!
> 
> Fail2Ban is running:
> root at sip:/etc/fail2ban# fail2ban-client start
> ERROR  Server already running
> 
> 
> I added everything in /etc/fail2ban/jail.conf
> 
> [ssh]
> enabled  = true
> port     = 22
> filter   = sshd
> logpath  = /var/log/auth.log
> maxretry = 6
> 
> [freeswitch]
> enabled  = true
> port     = 5060,5061,5080,5081
> filter   = freeswitch
> logpath  = /var/log/freeswitch/freeswitch.log
> maxretry = 10
> 
> 
> I also created /etc/fail2ban/filter.d/freeswitch.conf as shown on 
> https://github.com/fail2ban/fail2ban/blob/master/config/filter.d/freeswitch.conf
> 
> 
> root at sip:/etc/fail2ban/filter.d# iptables -S
> -P INPUT ACCEPT
> -P FORWARD ACCEPT
> -P OUTPUT ACCEPT
> -N fail2ban-ssh
> -A INPUT -p tcp -m multiport --dports 22 -j fail2ban-ssh
> 
> 
> As you can see when running iptables -S it shoes the "fail2ban-ssh" rule but 
> nothing about FreeSwitch.
> 
> 
> Any help is appreciated.
> 
> 
> 
> On Wed, Sep 7, 2016 at 11:01 AM, jungle Boogie <jungleboogie0 at gmail.com 
> <mailto:jungleboogie0 at gmail.com> > wrote:
> On 7 September 2016 at 08:33, Don Hawkins <hawkins at hawkinsegroup.com 
> <mailto:hawkins at hawkinsegroup.com> > wrote:
> > It keeps saying it's not there, but I did add it, is there something I'm
> > missing?
> 
> How did you add it? Is fail2ban running? Have you restarted your
> computer after setting up fail2ban? If you do iptables -S, do you see
> the rules?
> 
> 
> --
> -------
> inum: 883510009027723
> sip: jungleboogie at sip2sip.info <mailto:jungleboogie at sip2sip.info> 
> 
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
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> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com> 
> 
> Official FreeSWITCH Sites
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> 
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> 
> 
> 
> -- 
> Sincerely,
> Don Hawkins
> CEO
> Hawkins Enterprise Group LLC
> http://hawkinsegroup.com <http://hawkinsegroup.com> 
> Zello PTT <http://zello.com> : push2don
> P: 469-214-5044
> 
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com> 
> 
> Official FreeSWITCH Sites
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> http://www.cluecon.com <http://www.cluecon.com> 
> 
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> 
> 
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org <mailto:consulting at freeswitch.org> 
> http://www.freeswitchsolutions.com <http://www.freeswitchsolutions.com> 
> 
> Official FreeSWITCH Sites
> http://www.freeswitch.org <http://www.freeswitch.org> 
> http://confluence.freeswitch.org <http://confluence.freeswitch.org> 
> http://www.cluecon.com <http://www.cluecon.com> 
> 
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> 
> 
> 
> -- 
> Regards,
> Mirko
> 
> _________________________________________________________________________
> 
> Professional FreeSWITCH Consulting Services: 
> 
> consulting at freeswitch.org
> 
> http://www.freeswitchsolutions.com
> 
> 
> 
> Official FreeSWITCH Sites
> 
> http://www.freeswitch.org
> 
> http://confluence.freeswitch.org
> 
> http://www.cluecon.com
> 
> 
> 
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