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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 12 Jan 2018
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      • Report NetzDG Violation

      The recent @letsencrypt shutdown of TLS-SNI-01 validation (due to idiotic hosting providers) is very disappointing. It was by far the most convenient, hands-off, universal validation mechanism. https://community.letsencrypt.org/t/2018-01-11-update-regarding-acme-tls-sni-and-shared-hosting-infrastructure/50188 …

      3 replies 9 retweets 17 likes
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    2. comex‏ @comex 13 Jan 2018
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      Replying to @marcan42 @letsencrypt

      Is there any way to make a tls-sni-03 that doesn’t suffer from the same issue? I’m thinking not. The DNS just doesn’t give you the information to distinguish between the site owner and anyone on the same server - except through what it serves for the domain itself.

      2 replies 0 retweets 1 like
    3. comex‏ @comex 13 Jan 2018
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      Replying to @comex @marcan42 @letsencrypt

      (but of course you don’t want to have to swap out the site’s cert entirely.)

      1 reply 0 retweets 0 likes
    4. comex‏ @comex 13 Jan 2018
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      Replying to @comex @marcan42 @letsencrypt

      Idea: Allow using a SRV record to specify a different host/port which the CA will then verify with http-01. That way you don’t need dynamic DNS. Drawback: some consumer DNS hosts might not let you create SRV records…?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 13 Jan 2018
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      Replying to @comex @letsencrypt

      That sounds reasonable. Another option discussed on m.d.s.p is to use TLS NPN (e.g. 'acme') as an assertion that the server is secure. This requires code changes though.

      1 reply 0 retweets 0 likes
    6. comex‏ @comex 13 Jan 2018
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      Replying to @marcan42 @letsencrypt

      Silly idea: a method where the server tells you what IP address it’ll be verifying from, and you add an iptables rule based on source IP

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 13 Jan 2018
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      Replying to @comex @letsencrypt

      I think part of the rationale for not publishing validation IP addresses and potentially having them be unpredictable is to hinder e.g. BGP attacks to partially hijack the routing of a given IP.

      12:36 AM - 13 Jan 2018
      0 replies 0 retweets 0 likes

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