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__agwa's profile
Andrew Ayer
Andrew Ayer
Andrew Ayer
@__agwa

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Andrew Ayer

@__agwa

Founder of @SSLMate, author of Cert Spotter. I do #webpki and #CertificateTransparency stuff.

San Francisco Bay Area
agwa.name
Joined November 2011

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    1. Patryk Szczygłowski‏ @epatryk Apr 24

      Today's attack on @myetherwallet (via BGP hijack of AWS name servers) proves beyond doubt that everyone should implement DNSSEC and HSTS asap! DNSSEC = resolvers would deny fake records HSTS = browsers would prevent users burning themselves from self-signed certs.

      13 replies 132 retweets 177 likes
      Show this thread
    2. Patryk Szczygłowski‏ @epatryk Apr 24

      For people suggesting that @letsencrypt would issue a cert. No. Their resolver is DNSSEC-validating, resolution would fail and Let's Encrypt would deny certificate issuance.

      3 replies 3 retweets 18 likes
      Show this thread
      Andrew Ayer‏ @__agwa Apr 24
      Replying to @epatryk @myetherwallet @letsencrypt

      And what about the other 100+ organizations capable of issuing publicly-trusted certificates? There is no requirement to validate DNSSEC when doing domain validation.

      10:48 AM - 24 Apr 2018
      2 replies 0 retweets 0 likes
        1. Patryk Szczygłowski‏ @epatryk Apr 24
          Replying to @__agwa @myetherwallet @letsencrypt

          Maybe it should. That was one of the issues raised on http://mozilla.dev.security .policy when CAA checking became mandatory. How CA should behave on DNSSEC failure: treat CAA as non-existent and just move on of deny issuance.

          0 replies 0 retweets 3 likes
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        2. Matthew Hardeman‏ @mdhardeman Apr 24
          Replying to @__agwa @epatryk and

          I believe there's a requirement to consider DNSSEC in the checking of the CAA records (including for non-existence of any CAA record of relevance) in the presence of the DS anchors. SERVFAIL return on CAA record query blocks further validation.

          1 reply 0 retweets 0 likes
        3. Andrew Ayer‏ @__agwa Apr 24
          Replying to @mdhardeman @epatryk and

          Requirement is a strong word. CAs implemented it incorrectly and browsers wouldn't enforce.

          3 replies 0 retweets 0 likes
        4. Patryk Szczygłowski‏ @epatryk Apr 24
          Replying to @__agwa @mdhardeman and

          Root store programs could (by policy). Misbehaving CAs would get warned and eventually kicked out. @mozilla could definitely do it.

          1 reply 0 retweets 0 likes
        5. Andrew Ayer‏ @__agwa Apr 24
          Replying to @epatryk @mdhardeman and

          I was the person who argued on m.d.s.p. that Mozilla should enforce. They didn't.

          0 replies 0 retweets 0 likes
        6. End of conversation

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