From: Pablo Neira Ayuso <pablo@netfilter.org>
To: sean darcy <seandarcy2@gmail.com>
Cc: netfilter@vger.kernel.org
Subject: Re: rate limit SIP INVITES
Date: Sun, 27 Sep 2020 15:54:47 +0200 [thread overview]
Message-ID: <20200927135447.GA8628@salvia> (raw)
In-Reply-To: <rko3n2$jjm$1@ciao.gmane.io>
On Sat, Sep 26, 2020 at 03:10:24PM -0400, sean darcy wrote:
> nftables-0.9.6
>
> I'm running a VOIP server. There are lots of script kiddies who will bang
> away with 10/sec SIP INVITES or REGISTERS .
>
> In iptables you can match on the string:
>
> -A SIP -i eth0 -p udp -m udp --dport 5060 -m string --string "INVITE"
> --algo bm --from 23 --to 28 -m comment --comment "Catch SIP INVITEs" -j
> SIPINVITE
>
> -A SIP -i eth0 -p udp -m udp --dport 5060 -m string --string "REGISTER"
> --algo bm --from 23 --to 30 -m comment --comment "Catch SIP REGISTERs" -j
> SIPREGISTER
>
> I'm looking at RAW to do the same:
nft add rule x y udp dport 5060 @th,64,48 0x494e56495445 counter
@th => transport header
64 => from bit number 64 (8 bytes after the UDP header)
48 => extract 48 bits (6 bytes for INVITE)
next prev parent reply other threads:[~2020-09-27 13:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-26 19:10 rate limit SIP INVITES sean darcy
2020-09-26 20:26 ` sean darcy
2020-09-26 20:34 ` sean darcy
2020-09-26 20:45 ` sean darcy
2020-09-27 13:54 ` Pablo Neira Ayuso [this message]
2020-09-27 14:03 ` Pablo Neira Ayuso
2020-09-27 15:42 ` sean darcy
2020-09-27 19:12 ` Florian Westphal
2020-09-27 20:59 ` Pablo Neira Ayuso
2020-09-28 18:09 ` sean darcy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200927135447.GA8628@salvia \
--to=pablo@netfilter.org \
--cc=netfilter@vger.kernel.org \
--cc=seandarcy2@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox