[Freeswitch-users] Will fail2ban work for this?

Wed Mar 17 01:29:39 UTC 2021

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
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