linux-kernel - Re: [PATCH net] ipv6: Prevent ipv6_find_hdr() from returning ENOENT for valid non-first fragments

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]

Message-ID: <20150109114506.GA4857@salvia>
Date:	Fri, 9 Jan 2015 12:45:06 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Rahul Sharma <rsharma@...sta.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net] ipv6: Prevent ipv6_find_hdr() from returning ENOENT
 for valid non-first fragments

Hi Hannes,

On Fri, Jan 09, 2015 at 12:34:15PM +0100, Hannes Frederic Sowa wrote:
> On Fri, Jan 9, 2015, at 08:18, Rahul Sharma wrote:
> > Hi Pablo,
> > 
> > On Fri, Jan 9, 2015 at 5:35 AM, Pablo Neira Ayuso <pablo@...filter.org>
> > wrote:
> > > On Thu, Jan 08, 2015 at 11:39:16PM +0100, Hannes Frederic Sowa wrote:
> > >> Hi Pablo,
> > >>
> > >> On Thu, Jan 8, 2015, at 21:53, Pablo Neira Ayuso wrote:
> > >> > I'm afraid we cannot just get rid of that !ipv6_ext_hdr() check. The
> > >> > ipv6_find_hdr() function is designed to return the transport protocol.
> > >> > After the proposed change, it will return extension header numbers.
> > >> > This will break existing ip6tables rulesets since the `-p' option
> > >> > relies on this function to match the transport protocol.
> > >> >
> > >> > Note that the AH header is skipped (see code a bit below this
> > >> > problematic fragmentation handling) so the follow up header after the
> > >> > AH header is returned as the transport header.
> > >> >
> > >> > We can probably return the AH protocol number for non-1st fragments.
> > >> > However, that would be something new to ip6tables since nobody has
> > >> > ever seen packet matching `-p ah' rules. Thus, we restore control to
> > >> > the user to allow this, but we would accept all kind of fragmented AH
> > >> > traffic through the firewall since we cannot know what transport
> > >> > protocol contains from non-1st fragments (unless I'm missing anything,
> > >> > I need to have a closer look at this again tomorrow with fresher
> > >> > mind).
> > >>
> > >> The code in question is guarded by (_frag_off != 0), so we are
> > >> definitely processing a non-1st fragment currently. The -p match would
> > >> happen at the time when the packet is reassembled and thus ipv6_find_hdr
> > >> will find the real transport (final) header at this point (I hope I
> > >> followed the code correctly here).
> > >
> > > Then, Rahul should get things working by modprobing nf_defrag_ipv6.
> > 
> > I already had nf_defrag_ipv6 installed when the issue occured. But I
> > see ip6table_raw_hook returning NF_DROP for the second fragment.
> 
> That's what I expected. I think the change only affects hooks before
> reassembly.

reassembly happens at NF_IP6_PRI_CONNTRACK_DEFRAG (-400), so that
happens before NF_IP6_PRI_RAW (-300) in IPv6 which is where the raw
table is placed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/