[Freeswitch-users] how to block requests with From Ip equal to server interface IP?

[Steven Ayre]

Having your server IP in the From header is not necessarily incorrect. They
aren't necessarily saying that they are sending from that IP, it could be
them saying they are a user registered on your server. I'd block it based
on something else such as user-agent or fail2ban.


On 15 December 2017 at 17:32, Miguel Jesús López Valverde <
mjlopez at smartic.es> wrote:

> Good afternoon everyone
>
>
>
> I get a new query regarding a type of attack that our freeswitch servers
> receive constantly in case someone knows how to block them.
>
>
>
> These are INVITE or REGISTER requests in which the FROM: field arrives
> with the ip and port equal to the public interface of the server, so the
> different protection options that I have tried have not blocked these
> requests:
>
>
>
> - IpTables can not filter by the information From the INVITE message.
>
> - Fail2Ban is equally limited than IpTables.
>
> - ACLs have not resolved to filter these requests.
>
>
>
> Does anyone know any way to block these requests?
>
>
>
> I send here a trace with an INVITE message where you can see a request of
> this type.
>
>
>
> Thanks and best regards.
>
>
>
> U 2017/12/14 18:32:55.156886 185.107.94.121:11120 -> 182.30.1.194:5060
>
> INVITE sip:390239297988@ 182.30.1.194:5060;transport=UDP SIP/2.0.
>
> Via: SIP/2.0/UDP 122.221.117.131:5060;branch=z9hG4bK-524287-1---
> xi3qy2kz737ni404.
>
> Max-Forwards: 70.
>
> Contact: <sip:15714000000 <(571)%20400-0000>@122.221.117.
> 131:5060;transport=UDP>.
>
> To: <sip:390239297988@ 182.30.1.194;transport=UDP>.
>
> From: <sip:15714000000 <(571)%20400-0000>@ 182.30.1.194;transport=UDP>;
> tag=hlzg2jcv.
>
> Call-ID: KaQqH51mAcFv34qN8cGyv3...
>
> CSeq: 1 INVITE.
>
> Content-Type: application/sdp.
>
> User-Agent: Z 3.14.38765 rv2.8.3.
>
> Allow-Events: presence, kpml, talk.
>
> Content-Length: 0.
>
> .
>
>
>
>
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>
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