netdev - Re: Disable tcp MSS option in three way handshake?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 26 Oct 2012 00:42:28 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vincent Li <vincent.mc.li@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Disable tcp MSS option in three way handshake?

On Thu, 2012-10-25 at 15:27 -0700, Vincent Li wrote:
> Hi,
> 
> this sounds crazy, we have a weird situation that an unknown tcp
> implementation not putting tcp MSS option in the SYN/ACK which caused
> us some issue. I am tasked to mimic the unknown tcp immplementation on
> not sending MSS in tcp SYN/ACK, I am wondering if I can achieve that
> by modifying linux kernel tcp code,  there is socket option
> TCP_MAXSEG, but that seems only affecting the size of MSS, not
> removing the MSS option. do you have any pointer on how to do that in
> kernel tcp code?

You'll have to patch the code.

Or else, you could add a new feature to net/netfilter/xt_TCPMSS.c

(We already have 

#define XT_TCPMSS_CLAMP_PMTU 0xffff

You could add

#define XT_TCPMSS_REMOVE 0xfffe

and replace MSS option by NOP



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html