[tcpm] Fwd: Secdir Review of draft-stjohns-sipso-05

Lars Eggert <lars.eggert@nokia.com> Thu, 02 October 2008 13:54 UTC

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From: Lars Eggert <lars.eggert@nokia.com>
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Subject: [tcpm] Fwd: Secdir Review of draft-stjohns-sipso-05
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FYI, this discussion on the main IETF list needs input from transport  
folks. Look at Section 7.3 of draft-stjohns-sipso-05.

Lars

Begin forwarded message:

> From: "ext Steven M. Bellovin" <smb@cs.columbia.edu>
> Date: October 2, 2008 16:31:29 GMT+03:00
> To: "Steven M. Bellovin" <smb@cs.columbia.edu>
> Cc: draft-stjohns-sipso-05@tools.ietf.org, Sam Hartman <hartmans-ietf@mit.edu 
> >, secdir@mit.edu, ietf@ietf.org
> Subject: Re: Secdir Review of draft-stjohns-sipso-05
>
> On Wed, 1 Oct 2008 22:12:17 -0400
> "Steven M. Bellovin" <smb@cs.columbia.edu> wrote:
>
>>>    Steven> Note 7.3.1 on
>>>    Steven> TCP considerations.  (Also note that 7.3.1 disagrees
>>>    Steven> with 793 on the treatment of security labels in section
>>>    Steven> 3.6 of 793.  At the least, this shoudl be noted.
>>>
>>> I had completely missed this.  I'll call out the section to the
>>> transport ADs
>>>
>> I should have added: I think the new document is in fact more correct
>> than 793 -- the 793 scheme would permit various forms of
>> high-bandwidth covert channels to be set up.  This is an issue that
>> was not nearly that well understood when 793 was written.  That said,
>> it is a change to TCP, and needs to be treated as such.
>>
> Thinking further -- I suspect that the right thing to do here is for
> someone to write a short, simple draft amending 793 -- it's handling  
> of
> the security option is simply wrong, independent of this draft.  I
> wonder -- what TCPs actually implement even 793?  NetBSD doesn't; I
> strongly suspect that no BSDs do.  Does Solaris?  Linux?
>
> 		--Steve Bellovin, http://www.cs.columbia.edu/~smb
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