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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @colmmacc @mdhardeman

      Local DNSSEC validation is running on every DANE-emabled SMTP server. There are thousands of domains doing it, e.g. on the https://mailinabox.email  personal email appliance. Cisco will shortly roll out DANE support (with local validation) in their ESA product...

      1 reply 0 retweets 0 likes
    2. Colm MacCárthaigh‏ @colmmacc 28 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      ... but that's not where the users are. It can still be trivially spoofed between the mail server and the user, and it can often still be forged with a bit of effort even to the SMTP server.

      1 reply 0 retweets 0 likes
    3. Viktor Dukhovni‏ @VDukhovni 28 Mar 2018
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      Replying to @colmmacc @mdhardeman

      DANE is being used today to secure traffic between (some) SMTP MTAs. DNSSEC is not used between the user and the MSA or IMAP server. That's where WebPKI is used at present. Both are presently well suited to their respective roles. I am not hating your use-case, stop hating mine

      1 reply 0 retweets 0 likes
    4. Colm MacCárthaigh‏ @colmmacc 29 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      DNSSEC isn't suited to its role. It doesn't actually work, and it causes outages. Of course I hate that. There's no room for "agree to disagree"; "secure" as a verb doesn't apply to something that uses SHA1.

      1 reply 0 retweets 0 likes
    5. Viktor Dukhovni‏ @VDukhovni 29 Mar 2018
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      Replying to @colmmacc @mdhardeman

      DNSSEC does not rely on collision resistance, only 2nd-preimage resistance. There are no preimage attacks on SHA1, and none expected any time soon. Lots of domains use SHA258 (alg 8). You don't understand rfc7435. Your absolutist posture is harmful.

      1 reply 0 retweets 0 likes
    6. Colm MacCárthaigh‏ @colmmacc 29 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      Nope - DNSSEC is harmful. Don't use it, and please don't mislead users otherwise, it's not responsible! I'm persisting here as your zealous style can give the impression that there are two sides, but there aren't. Hopefully it's noticeable that you don't rebut the points I make.

      1 reply 0 retweets 0 likes
    7. Viktor Dukhovni‏ @VDukhovni 29 Mar 2018
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      Replying to @colmmacc @mdhardeman

      Frankly, you don't make any points worth rebutting. Just absolutist pronouncements based on no evidence. Anyway it is clear that you're holding on to your "all or nothing" (i.e. often nothing) security posture. Many of us have figured out why that's a bad idea and moved on.

      1 reply 0 retweets 0 likes
    8. Colm MacCárthaigh‏ @colmmacc 29 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      Plenty of evidence for DNSSEC outages, plenty of evidence that DNSSEC does not in fact work, plenty of evidence of DNSSEC in DDOS attacks. Not end-to-end, broken crypto, downgrades, awful trust model, no end-user signaling. Don't use DNSSEC.

      1 reply 0 retweets 0 likes
    9. Viktor Dukhovni‏ @VDukhovni 29 Mar 2018
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      Replying to @colmmacc @mdhardeman

      It is end-to-end as used for app security in DANE or to defend a resolver cache against poisoning. Yes, if you're using quad 8/9 you don't get MiTM protection, but you're not using DNSSEC the resolver operator is, (surprise!) non-users are not protected. The algs are good enough

      1 reply 0 retweets 0 likes
    10. Colm MacCárthaigh‏ @colmmacc 29 Mar 2018
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      Replying to @VDukhovni @mdhardeman

      🤦‍♂️ It's end to end in neither case. Users aren't resolver caches or SMTP servers. This is "Well I locked the side door, so if the attacker goes there, we're good. Never mind the open front door" 'security'.

      2 replies 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 29 Mar 2018
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      Replying to @colmmacc @VDukhovni @mdhardeman

      Oh, also the lock is cheap plastic in this metaphor.

      10:53 AM - 29 Mar 2018
      1 reply 0 retweets 0 likes
        1. Viktor Dukhovni‏ @VDukhovni 29 Mar 2018
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          Replying to @colmmacc @mdhardeman

          DANE is used to authenticate TLS connections that encrypt email transport between domains. DNSSEC secures the TLSA RRs end-to-end from target to sender domain. E2E email encryption is unusable, but hop by hop TLS is effective against bulk surveillance. No plastic

          0 replies 0 retweets 0 likes
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