Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-attack
Bob Harold <rharolde@umich.edu> Thu, 11 July 2019 14:29 UTC
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From: Bob Harold <rharolde@umich.edu>
Date: Thu, 11 Jul 2019 10:28:26 -0400
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To: Mark Andrews <marka@isc.org>
Cc: IETF DNSOP WG <dnsop@ietf.org>
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Subject: Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-attack
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Thanks for explaining that. I leave it up to you if a comment to that affect in the draft would avoid the same question in the future. -- Bob Harold On Wed, Jul 10, 2019 at 5:12 PM Mark Andrews <marka@isc.org> wrote: > AAAA is the base64 encoding of 3 zero octet. If named was using a hex > encoding it would be 000000. > > -- > Mark Andrews > > On 11 Jul 2019, at 06:45, Bob Harold <rharolde@umich.edu> wrote: > > > On Wed, Jul 10, 2019 at 2:21 AM Mark Andrews <marka@isc.org> wrote: > >> I’ve written up a method to defeat UDP fragmentation attacks using TSIG. >> >> https://tools.ietf.org/html/draft-andrews-dnsop-defeat-frag-attack-00 >> >> If we are going to discuss methods to defeat such attacks this should be >> considered. >> >> -- >> Mark Andrews, ISC >> > > Looks like a useful workaround. > > 2. The Well Known Key > > The well known key has a owner name of "." and uses HMAC-SHA256 > [RFC4635] as its algorithm with a key of 256 zero bits. > > > -- but later: > > A.1. BIND 9 > > Add the following to named.conf. Some end-of-life versions do not > support HMAC-SHA256. > > key "." { > algorithm hmac-sha256; > secret "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA="; > }; > > > -- Does a key of 256 zeros translate to a string of "A" characters? I am > not an expert on HMAC-SHA256. > > -- > Bob Harold > >
- [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-atta… Mark Andrews
- Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-… Mukund Sivaraman
- [DNSOP] fragmentation itself (Re: FYI: draft-andr… Paul Vixie
- Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-… Bob Harold
- Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-… Mark Andrews
- Re: [DNSOP] fragmentation itself (Re: FYI: draft-… Mark Andrews
- Re: [DNSOP] FYI: draft-andrews-dnsop-defeat-frag-… Bob Harold
- Re: [DNSOP] fragmentation itself (Re: FYI: draft-… Tim Wicinski
- Re: [DNSOP] fragmentation itself (Re: FYI: draft-… Paul Vixie
- Re: [DNSOP] fragmentation itself (Re: FYI: draft-… Tim Wicinski