Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-aname-00.txt
"Peter van Dijk" <peter.van.dijk@powerdns.com> Mon, 10 April 2017 10:04 UTC
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From: Peter van Dijk <peter.van.dijk@powerdns.com>
To: dnsop@ietf.org
Date: Mon, 10 Apr 2017 12:04:52 +0200
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References: <20170407181139.GB66383@isc.org> <cc3bbc7a-3f48-2f7f-a3d9-3f752874fc00@redhat.com>
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Subject: Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-aname-00.txt
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On 10 Apr 2017, at 11:29, Florian Weimer wrote: > On 04/07/2017 08:11 PM, Evan Hunt wrote: >> Title: Address-specific DNS Name Redirection (ANAME) > > I think the introduction should discuss why it is not possible to push > the CNAME to the parent zone, replacing the entire zone with an alias. Why this is not possible seems obvious to me, but we’ll see what we can write. > Section 3 is currently written in such a way that a recursive DNS > lookup must be performed at the authoritative server side. I don't > think it is necessary to require that. A recursive DNS lookup of the > target is just one way to implement this. What other ways did you have in mind? > In particular, the suggested recursive DNS lookup needs some form of > distributed loop detection. Otherwise, a malicious customer could > publish two zones with ANAME records and achieve significant traffic > amplification, potentially taking down the DNS hoster. A hop count in > an EDNS option or an “ANAME lookup in progress” indicator would be > one way to implement this. Another approach would impose restrictions > on the owner name of an ANAME record and its target, and restrict > where CNAMEs can appear, so that a valid ANAME can never point to > another valid ANAME. I’m not sure it’s feasible to forbid chaining ANAMEs. I do agree there is a vector for DoS here. Section 6 currently cowardly says “Both authoritative servers and resolvers that implement ANAME should carefully check for loops and treat them as an error condition.” but I am aware that more words are needed. Kind regards, -- Peter van Dijk PowerDNS.COM BV - https://www.powerdns.com/
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Richard Gibson
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… John Levine
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Richard Gibson
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Ray Bellis
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Ray Bellis
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Jan Včelák
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… John Levine
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Mark Andrews
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… John Levine
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… John Levine
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… 神明達哉
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Paul Wouters
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Tony Finch
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… 神明達哉
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Florian Weimer
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Lanlan Pan
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- [DNSOP] new ANAME draft: draft-hunt-dnsop-aname-0… Evan Hunt
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Job Snijders
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… Peter van Dijk
- Re: [DNSOP] new ANAME draft: draft-hunt-dnsop-ana… 神明達哉