[quicwg/base-drafts] CONNECTION_CLOSE for unpadded Initial (#3269)

Martin Thomson <notifications@github.com> Wed, 20 November 2019 02:59 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE4BC1201EF for <quic-issues@ietfa.amsl.com>; Tue, 19 Nov 2019 18:59:51 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.999
X-Spam-Level:
X-Spam-Status: No, score=-7.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_32=0.001, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w4cu81eEgJZj for <quic-issues@ietfa.amsl.com>; Tue, 19 Nov 2019 18:59:45 -0800 (PST)
Received: from out-5.smtp.github.com (out-5.smtp.github.com [192.30.252.196]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 83CA61200B8 for <quic-issues@ietf.org>; Tue, 19 Nov 2019 18:59:45 -0800 (PST)
Date: Tue, 19 Nov 2019 18:59:44 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1574218784; bh=BtOPTquQV7eTQYyNAY/2BzNteGlq5XDosR7ulV7jv/I=; h=Date:From:Reply-To:To:Cc:Subject:List-ID:List-Archive:List-Post: List-Unsubscribe:From; b=Be3FcT0cVRXXxiQhtUdXiV1JPvPwRC9iycy8DTAeJ4+87w+RM7jb37r8dDjmNA9Dt th1osQ2HvwmaysaBpNKMR4M4YcLUvjTfaqmYJ56qFwm0sRlmHptgiafcSRqIqHFIN3 5lvp8beJWf2DNJ+T0KPXQxH+hjt0r1GvrMhvD8gI=
From: Martin Thomson <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK76YVRCQUMVNM4L7N534HPKBEVBNHHB6UGSKE@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/3269@github.com>
Subject: [quicwg/base-drafts] CONNECTION_CLOSE for unpadded Initial (#3269)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5dd4ac207bc26_34ed3f90a48cd95c482b4"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: martinthomson
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/Ud8qpPJW_8XORfeC9Rp586sKyGU>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 20 Nov 2019 02:59:52 -0000

The draft requires that if an Initial packet is not padded, the server sends a CONNECTION_CLOSE.  I think that the goal was to have the server drop those packets and *optionally* send a signal.  But that only applies if the server hasn't established state.  We should reword that.


@nibanks says:
> I'm more worried about this as an attack vector. Now that we support multiple initial packets for the client initial, there is more of a windows for an attacker to race a bad initial packet. Sending a 1 byte initial packet to kill your connection would be pretty easy; especially since the size validation check is going to happen pre-decryption, so the attacker doesn't even need to craft a well-formed packet.

_Originally posted by @nibanks in https://github.com/quicwg/base-drafts/pull/3262_

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/3269