Re: [dnssd] Genart last call review of draft-ietf-dnssd-push-20

Ted Lemon <mellon@fugue.com> Sun, 14 July 2019 21:08 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Sun, 14 Jul 2019 17:08:41 -0400
Cc: Stuart Cheshire <cheshire=40apple.com@dmarc.ietf.org>, Eric Rescorla <ekr@rtfm.com>, DNSSD <dnssd@ietf.org>, draft-ietf-dnssd-push.all@ietf.org, David Schinazi <dschinazi.ietf@gmail.com>, Tom Pusateri <pusateri@bangj.com>, Robert Sparks <rjsparks@nostrum.com>
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To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [dnssd] Genart last call review of draft-ietf-dnssd-push-20
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I don’t know if a stack that does this either. It could be done in principle. But it sounds like that wasn’t the goal. 

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> On Jul 14, 2019, at 5:05 PM, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> 
> Ted Lemon <mellon@fugue.com> wrote:
>> forging an RST to the server. We should discuss whether this is a
>> serious concern that we need to take into account. If it is, then using
>> close_notify would protect against this iff the server ignores TCP RSTs
>> for active TLS sessions.
> 
> I'm unaware of TCP stacks that can turn off RSTs on a per-socket basis.
> Is this commonly available now and I'm just ignorant of it?
> 
> I imagine that is the only way the application could inform the kernel that
> TLS is active.
> 
> I guess a filter could drop RSTs to port 853, and assume it's always TLS.
> 
> Securing TCP against fake RSTs is something the TCP-AO was designed to do.
> AFAIK, we never defined a way to key TCP-AO from TLS.
> 
> -- 
> ]               Never tell me the odds!                 | ipv6 mesh networks [ 
> ]   Michael Richardson, Sandelman Software Works        | network architect  [ 
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [ 
>