[Freeswitch-users] Will fail2ban work for this?

Wed Mar 17 01:59:31 UTC 2021

I like your 2nd option. I always assumed 5080 was safe because it isn't the
SIP port. It is listed as the "OnScreen Data Collection Service" in the
official port number database (
https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?&page=89),
but I guess the hackers know the SIP people like to use it. I'll try
switching to another port.

-- 
Steve

On Tue, Mar 16, 2021 at 6:30 PM David Villasmil <
david.villasmil.work at gmail.com> wrote:

> It works, sure. But needs to be configured.
>
> https://freeswitch.org/confluence/display/FREESWITCH/Fail2Ban should help
> you, especially the configuration part.
>
> For fail2ban to work, it needs to see a line in the logfile with the
> originating IP address, for that to work on failed call attempts you need
> to add a specific failure log. Something like adding a catch-all extension
> at the very end of the dialplan and log the originating IP. Then grab that
> with fail2ban.
>
> something like:
>
> <extension name="catch-all">
>   <condition field="destination_number" expression="^.*$">
> <condition field="${sip_authorized}" expression="^false$">
>      <action application="log" data="CRIT caught
> ${variable_sip_received_ip} trying to call."/>
>      <action application="hangup" data=""/>
> </condition>
>   </condition>
> </extension>
>
> Then a regexp on *filter.d/freeswitch.local*
>
> [Definition]
> failregex = ^.* caught <HOST> trying to call$
>
> NOTE: I didn't test any of this, you'll need to test yourself, but it
> should be a starting point.
>
>
> Another option, which i like on top of the already mentioned, is to _not_
> use a default port 5080, use something like 9909 (security by obscurity)
>
>
>
> Regards,
>
> David Villasmil
> email: david.villasmil.work at gmail.com
> phone: +34669448337
>
>
> On Tue, Mar 16, 2021 at 11:40 PM Steven Schoch <
> schoch+freeswitch.org at xwin32.com> wrote:
>
>> I just set up a new FreeSWITCH system on my home network, and set a
>> forward for port 5080 to connect to Flowroute. While I'm debugging some
>> call routing stuff, my logs are getting overrun with stuff like this:
>>
>> 2021-03-16 15:52:02.267501 [NOTICE] switch_channel.c:1118 New Channel
>> sofia/external/7750@<my IP> [2de89b87-cd07-4c0f-b9fb-3da8e5a68d37]
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:585
>> (sofia/external/7750@<my IP>) Running State Change CS_NEW (Cur 1 Tot
>> 7822)
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] sofia.c:10280 sofia/external/7750@<my
>> IP> receiving invite from 80.94.93.12:62635 version: 1.10.5
>> -release-17-25569c1631 64bit
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] sofia.c:7326 Channel
>> sofia/external/7750@<my IP> entering state [received][100]
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] sofia.c:7336 Remote SDP:
>>
>> v=0
>>
>> o=- 81921704 81921704 IN IP4 0.0.0.0
>>
>> s=pplsip
>>
>> c=IN IP4 0.0.0.0
>>
>> t=0 0
>>
>> m=audio 7628 RTP/AVP 100 6 0 8 3 18 5 101
>>
>> a=rtpmap:100 speex/16000
>>
>> a=rtpmap:101 telephone-event/8000
>>
>> a=fmtp:101 0-11
>>
>> a=alt:1 1 : DF50DC48 0000001F 0.0.0.0 7628
>>
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] sofia.c:7739 (sofia/external/7750@<my
>> IP>) State Change CS_NEW -> CS_INIT
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:604
>> (sofia/external/7750@<my IP>) State NEW
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:585
>> (sofia/external/7750@<my IP>) Running State Change CS_INIT (Cur 1 Tot
>> 7822)
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:628
>> (sofia/external/7750@<my IP>) State INIT
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] mod_sofia.c:93 sofia/external/7750@<my
>> IP> SOFIA INIT
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:40
>> sofia/external/7750@<my IP> Standard INIT
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:48
>> (sofia/external/7750@<my IP>) State Change CS_INIT -> CS_ROUTING
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:628
>> (sofia/external/7750@<my IP>) State INIT going to sleep
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:585
>> (sofia/external/7750@<my IP>) Running State Change CS_ROUTING (Cur 1 Tot
>> 7822)
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_channel.c:2332
>> (sofia/external/7750@<my IP>) Callstate Change DOWN -> RINGING
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:644
>> (sofia/external/7750@<my IP>) State ROUTING
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] mod_sofia.c:154 sofia/external/7750@<my
>> IP> SOFIA ROUTING
>>
>> 2021-03-16 15:52:02.267501 [DEBUG] switch_core_state_machine.c:236
>> sofia/external/7750@<my IP> Standard ROUTING
>>
>> 2021-03-16 15:52:02.267501 [INFO] mod_dialplan_xml.c:637 Processing 7750
>> <7750>->900442037697855 in context public
>>
>>
>> I thought fail2ban was designed for stuff like this, but I don't see any
>> auth attempts here (I set "log-auth-failures" to "true"). These are coming
>> in a bit faster than 1 per second. It appears they are dialing random
>> extensions. How can I make them stop?
>>
>> --
>> Steve
>> _________________________________________________________________________
>>
>> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
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>>
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>
> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
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