Hi Tommy,
I also think this is very relevant work. Here are some comments to -01:
I think that Yoav's draft, draft-nir-ipsecme-ike-tcp-01, should be cited
under "prior work", both because it is documented and also because I
believe it is implemented by a vendor.
In Sec. 1, under the UDP encapsulation, I suggest to add "Often peers
will use UDP encapsulation even when there is no NAT on the path, for
example because networks or middleboxes do not support IP protocols
other than TCP and UDP."
"Although a stream" - this paragraph is not worded very well (streams
don't send anything) and is hard to understand. In addition, there are
lots of networks that use jumbo frames and so hardcoding the value 1500
into the spec may not be a good idea.
I can think of HA cases where several gateways will handle ESP SAs that
are all associated with the same IKE SA. So I'm wondering why we are
insisting of all Child SAs being in the same TCP connection, and as a
result requiring that an IKE message should be the preamble of any new
connection.
Although it might seem obvious, I think Sec. 3 should say explicitly
that if the connection is closed midway through a message, the recipient
MUST silently drop the partial message.
You may want to add to the last paragraph of the Security
Considerations: This document explicitly does not define a profile for
TLS when used in this manner, or any relation between identities at the
IPsec level and those on the TLS level ("channel binding").
Thanks,
Yaron
On 11/20/2015 11:49 PM, Tommy Pauly wrote:
Hello,
Based on the feedback received at our informal meeting in Yokohama, I’ve
updated the draft for TCP Encapsulation of IKEv2 and ESP:
https://tools.ietf.org/html/draft-pauly-ipsecme-tcp-encaps-01
The revisions include:
- More explanation in the introduction about the motivation, and other work
that this draft is trying to standardize (3GPP recommendations, proprietary
IKEv1 IPSec over TCP versions, and SSL VPNs).
- Comments about maximum IKE and ESP message size within the TCP stream, which
is effective the MTU of the tunnel.
- Specify that if the TCP connection is brought down and re-established, the
first message on the stream must be an IKE message.
- Detailed considerations about interactions with middleboxes (thanks Graham
Bartlett for input on this).
In the meeting in Yokohama, there was general agreement that this was relevant
work that we’d like to keep looking into. Please read the document, and provide
any feedback you have!
Thanks,
Tommy
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