IDS mailing list archives
Re: IPv6 support in IDS/IPS products
From: Mike Frantzen <frantzen () nfr com>
Date: Thu, 10 Nov 2005 09:10:49 -0500
I'll chime in seeing as most of the v6 code is mine. Adding IPv6 support was actually pretty easy for us. We had to add another branch at the ethertype demux layer: packet_receive() if (ether_type == ETHERTYPE_IP) ip_receive() else if (ether_type == ETHERTYPE_IPV6) ip6_receive() The IPv6 IP layer stuff is almost identical to the IPv4 IP stuff. The biggest difference is how it parses the IPv6 options. They even share most of the fragment reassembly code. At the end of both IP stacks we check for tunnels and recurse the packet back into whichever stack was tunneled. The only change to the UDP layer is the checksum code (UDP checksums are mandatory in IPv6) and the pseudoheader obviously extended for the longer addresses. The TCP stack changes involved the checksumming again and extending the state lookup for the longer addresses. We chose to do IPv6 support exclusively in the engine and keep the signature language IP version agnostic as much as possible. Our N-Code language contains intrinsic variables like 'ip.src' and 'tcp.connSrc' which have their own "IP address" typing which was extended to transparently support IPv6 as well as v4. An example from Matt LeGrow's MSRPC portmapper code: $index = pack(ip.src, ip.dst, udp.dport, "UDP"); if (MSRPC_PORTMAP[$index]) { ... MSRPC_PORTMAP is an associative array (just like a hash table) which is watching for msrpc portmap scanning. The hash key is based on 'ip.src' and 'ip.dst' which can be either of IPv4 or IPv6 without the actual signature having to care. There are constructs in the N-Code signature language to specify IPv4 or IPv6 if the signature needs the information or is specific to one IP version. The performance hit is probably on the order of ~1%. We lose hardware checksum acceleration with IPv6; which gets offset by the fact that doing the checksum in software acts like a cache preload. And there are obviously a few extra branches in the IPv4/IPv6 shared code. .mike frantzen@(nfr.com | cvs.openbsd.org | w4g.org) PGP: CC A4 E2 E8 0C F8 42 F0 BC 26 85 5B 6F 9E ED 28
Mike, Adding IPv6 support is not a trivial process. Can you be a little more specific? -----Original Message----- From: Mike Barkett [mailto:mbarkett () nfr com] Sent: Monday, November 07, 2005 5:26 PM To: 'Scott Sloan'; 'David Williams'; 'Planz' Cc: focus-ids () securityfocus com Subject: RE: IPv6 support in IDS/IPS products Scott - There is no performance hit on NFR, as IPv6 support is built into the sensor engine. Thanks. -MAB-----Original Message----- From: Scott Sloan [mailto:swsloan.ml () gmail com] Sent: Monday, November 07, 2005 4:49 PM To: 'David Williams'; 'Planz' Cc: 'Mike Barkett'; focus-ids () securityfocus com Subject: RE: IPv6 support in IDS/IPS products What is the performance hit when turning on this feature within NFR and ISS? -Scott -----Original Message----- From: David Williams [mailto:dwilliamsd () gmail com] Sent: Monday, November 07, 2005 9:51 AM To: Planz Cc: Mike Barkett; focus-ids () securityfocus com Subject: Re: IPv6 support in IDS/IPS products I'm a little surprised. I have only heard back from two vendors that claim to do full IPv6: NFR & ISS. I doubt this is an accurate representation, so I'll try one more time. Has anybody heard anything about the other products out there? thanks, D On 11/3/05, Planz <planz2009 () gmail com> wrote:As per the below whitepaper, ISS is supporting IPv6 and corresponding tunneling to IPv4 and vice versa, but I have seen no claims by other verdors as well. http://documents.iss.net/whitepapers/IPv6.pdf Besides that, I read an interesting slide on IPv6 Security in the following link: http://www.wareonearth.com/whitepapers/IPv6SecurityIssues.pps Mike Barkett wrote:David - I will pipe up for NFR. Our Sentivist Smart sensors are nativelycapable of"all of the above" at the sensor engine level. Tunneling, fullanalysis,everything. And we've been doing it for a couple of years now. I cannot provide a list of vendors who do this, but I will say that Iwastold 7 months ago by an IPv6 expert that we were the only IPS vendor hewasaware of who did it "properly". I don't know if that's actually/stilltrue,so I'd be very interested in seeing who else chimes in on this thread. Not surprisingly, we find this feature to be very popular in the U.S. government and overseas, particularly in Asia. What we try to explaintothe rest of the world is that even if they don't think they are running IPv6, parts of their network may still be at risk of a tunneled IPv6attack.-MAB -- (nfr)(security) Michael A Barkett, CISSP Vice President, Systems Engineering (www.nfr.com) +1.240.632.9000 Fax: +1.240.747.3512-----Original Message----- From: David Williams [mailto:dwilliamsd () gmail com] Sent: Sunday, October 30, 2005 9:53 AM To: focus-ids () securityfocus com Subject: IPv6 support in IDS/IPS products Hi list, I've read that some IDS/IPS vendors can monitor IPv6, but not completely. For example, they might be able to alert on the presence of IPv6 traffic, but they can't actually do full analysis because they can't parse the headers correctly. Especially for things like IPv6 tunneled over IPv4, or IPv6 tunneled over IPv6, etc. Does anybody have a list of which vendors support what, and to what extent? thanks, D
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Current thread:
- IPv6 support in IDS/IPS products David Williams (Nov 03)
- RE: IPv6 support in IDS/IPS products Mike Barkett (Nov 03)
- Re: IPv6 support in IDS/IPS products Planz (Nov 07)
- Re: IPv6 support in IDS/IPS products David Williams (Nov 07)
- RE: IPv6 support in IDS/IPS products Scott Sloan (Nov 09)
- RE: IPv6 support in IDS/IPS products Mike Barkett (Nov 09)
- RE: IPv6 support in IDS/IPS products Scott Sloan (Nov 09)
- Re: IPv6 support in IDS/IPS products Jim Bauer (Nov 10)
- Re: IPv6 support in IDS/IPS products Mike Frantzen (Nov 10)
- Re: IPv6 support in IDS/IPS products Planz (Nov 07)
- RE: IPv6 support in IDS/IPS products Mike Barkett (Nov 03)
- <Possible follow-ups>
- RE: IPv6 support in IDS/IPS products Palmer, Paul (ISSAtlanta) (Nov 07)
- Re: RE: IPv6 support in IDS/IPS products barcajax (Nov 09)
- Re: RE: IPv6 support in IDS/IPS products David Williams (Nov 10)
- RE: IPv6 support in IDS/IPS products Palmer, Paul (ISSAtlanta) (Nov 10)