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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. Andrew Ayer‏ @__agwa 10 Apr 2019
      • Report Tweet
      • Report NetzDG Violation

      Better add "mta-sts" to the list of sub-domains you don't allow your users to register: https://tools.ietf.org/html/rfc8461#section-3.2 …

      2 replies 16 retweets 28 likes
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    2. hanno‏ @hanno 11 Apr 2019
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      • Report NetzDG Violation
      Replying to @__agwa

      while that's an interesting idea, realistically... people will probably rarely have a domain with user-subdomains *and* run email on it.

      1 reply 0 retweets 1 like
    3. hanno‏ @hanno 11 Apr 2019
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      Replying to @hanno @__agwa

      thinking about it: this is almost irrelevant. if the host operator wants to use mta-sts they'll already have claimed the domain. if not they won't set the DNS record. So even if you control the subdomain your policy will never be read.

      1 reply 0 retweets 1 like
    4. Andrew Ayer‏ @__agwa 11 Apr 2019
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      Replying to @hanno

      I'm not saying that allowing this sub-domain to be registered automatically creates a security vulnerability. But it seems safer to blacklist it now to avoid potential headaches and bugs if you ever decide to deploy MTA-STS in the future.

      1 reply 0 retweets 1 like
    5. Andrew Ayer‏ @__agwa 11 Apr 2019
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      Replying to @__agwa @hanno

      Also, just because "mta-sts" has been provisioned by the operator doesn't necessarily mean a user can't usurp it. You could end up with two Apache virtual hosts - one provisioned manually by the operator for MTA-STS, the other created automatically by the user onboarding code.

      1 reply 0 retweets 1 like
      Andrew Ayer‏ @__agwa 11 Apr 2019
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      Replying to @__agwa @hanno

      Which one gets used depends on the order in the config. I'm also reminded of .io being taken over because they let someone register the domains ns-a[1-4].io - the same names as their NS servers. So I stand by my advice - just blacklist "mta-sts".

      11:13 AM - 11 Apr 2019
      • 1 Retweet
      • 1 Like
      • Ryan Sleevi Ivan Ristic
      0 replies 1 retweet 1 like

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