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

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Andrew Ayer

@__agwa

Bootstrapped founder of @SSLMate, where I make SSL certificates easier and do #webpki and #CertificateTransparency stuff.

Cambridge, MA + SF Bay Area
agwa.name
Joined November 2011

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    1. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 Dec 2019
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      @__agwa Congratulations on charging more™ for @SSLMate! I just used https://sslmate.com/caa  and I'm so happy to pay you now! The CA metadata work is amazing, too!

      3 replies 0 retweets 8 likes
      Show this thread
    2. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 Dec 2019
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      BTW, "C=FR, ST=Paris, L=Paris, O=Gandi, CN=Gandi Standard SSL CA 2" reports Sectigo as both brand and operator. Shouldn't the brand be Gandi?

      2 replies 0 retweets 0 likes
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    3. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 Dec 2019
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      Also, it would be nice to be able to authorize CAs per endpoint. I'm ok with Cloudflare certs for my Ghost blog, but I don't want them issuing for any other endpoint.

      3 replies 0 retweets 1 like
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    4. BenBE‏ @BenBE1987 7 Dec 2019
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      Replying to @FiloSottile @__agwa @SSLMate

      You can put a CAA record per subdomain AFAIR …

      1 reply 0 retweets 0 likes
    5. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 Dec 2019
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      Replying to @BenBE1987 @__agwa @SSLMate

      Yeah you can with CAA, I meant as whitelisted CAs in CertSpotter.

      1 reply 0 retweets 1 like
    6. BenBE‏ @BenBE1987 7 Dec 2019
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      Replying to @FiloSottile @__agwa @SSLMate

      They could simply allow import from matching DNS policy. Although there's probably not many users who have a very mixed setup.

      1 reply 0 retweets 1 like
    7. Andrew Ayer‏ @__agwa 7 Dec 2019
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      Replying to @BenBE1987 @FiloSottile @SSLMate

      Quite a few people have asked for CAA to be consulted. Have to be careful, because DNS is not transparent and (usually) not authenticated. Current plan is to make it an option, and send an email any time Cert Spotter relies on a CAA record for the first time.

      1 reply 0 retweets 1 like
    8. BenBE‏ @BenBE1987 7 Dec 2019
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      Replying to @__agwa @FiloSottile @SSLMate

      At least for http://security.fail  the records are DNSSEC signed … That should eliminate the auth issue. What do you mean for the transparency issue? Anycast-DNS?

      1 reply 0 retweets 0 likes
      Andrew Ayer‏ @__agwa 7 Dec 2019
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      Replying to @BenBE1987 @FiloSottile @SSLMate

      There's no CT-like system for DNS. Since Cert Spotter is a CT monitor, it shouldn't rely on a system that has weaker security guarantees than CT.

      11:48 AM - 7 Dec 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. BenBE‏ @BenBE1987 7 Dec 2019
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          Replying to @__agwa @FiloSottile @SSLMate

          And having it explicitly "Import CAA policy from DNS" with a second step for the user to confirm the read data? From the certs in Cert Spotter you should be able to know which DNS records to ask for.

          1 reply 0 retweets 0 likes
        3. Andrew Ayer‏ @__agwa 7 Dec 2019
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          Replying to @BenBE1987 @FiloSottile @SSLMate

          It will be sort of like that, except the importing will be continuous (since CAA records can change over time) and the user will be informed over email when there's a change.

          1 reply 0 retweets 1 like
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