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jedisct1's profile
Frank
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Frank
@jedisct1

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Frank

@jedisct1

France
Joined November 2008

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    1. Frank‏ @jedisct1 10 Apr 2019
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      RT @tqbf: Google takes an affirmative step towards finally killing off DNSSEC, deploys MTA-STS. https://security.googleblog.com/2019/04/gmail-making-email-more-secure-with-mta.html …

      2 replies 8 retweets 9 likes
    2. sdayman‏ @Scott_Dayman 10 Apr 2019
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      Replying to @jedisct1 @tqbf

      I did not think they were *that* closely related. DNSSEC makes sure you're receiving an authentic DNS record, and MTA-STS forces TLS connections in email delivery. So SMTP is safer without the need for DNSSEC. What about all the other protocols?

      1 reply 0 retweets 0 likes
    3. Thomas H. Ptacek‏ @tqbf 10 Apr 2019
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      Replying to @Scott_Dayman @jedisct1

      What other protocols are you thinking about?

      1 reply 0 retweets 0 likes
    4. sdayman‏ @Scott_Dayman 10 Apr 2019
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      Replying to @tqbf @jedisct1

      SSH, NTP, FTP (eek!)…

      1 reply 0 retweets 0 likes
    5. Thomas H. Ptacek‏ @tqbf 10 Apr 2019
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      Replying to @Scott_Dayman @jedisct1

      SSH doesn’t depend on the DNS for security; in fact, not depending on the DNS is the entire purpose of SSH (it replaces the DNS-dependent r-commands).

      3 replies 0 retweets 0 likes
    6. sdayman‏ @Scott_Dayman 10 Apr 2019
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      Replying to @tqbf @jedisct1

      I'd like to know I'm SSH'ing to the right server. There's a chance the host has an SSHFA record…but that depends on DNSSEC. Isn't the point of DNSSEC to stop MITMing DNS?

      3 replies 0 retweets 0 likes
    7. Thomas H. Ptacek‏ @tqbf 10 Apr 2019
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      Replying to @Scott_Dayman @jedisct1

      SSH uses key continuity to ensure that you’re not MITM’d; it doesn’t rely on DNS, which, again, is the point of the whole system.

      1 reply 0 retweets 0 likes
    8. sdayman‏ @Scott_Dayman 10 Apr 2019
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      Replying to @tqbf @jedisct1

      I feel like I'm hogging up the thread, and I don't mean to be difficult. But first SSH connection knows nothing about the destination other than hostname, right?

      2 replies 0 retweets 0 likes
      Frank‏ @jedisct1 10 Apr 2019
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      Replying to @Scott_Dayman @tqbf

      The first thing the client will learn after the first round trip is the server public key and its signature, that will be verified using the CA’s public key. No need for DNSSEC here, but you need to deploy the CA’s public key on clients.

      2:42 PM - 10 Apr 2019
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      • sdayman
      1 reply 0 retweets 1 like
        1. Thomas H. Ptacek‏ @tqbf 10 Apr 2019
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          Replying to @jedisct1 @Scott_Dayman

          This is what the cool kids do and it’s what you should do if you’re building out SSH for a startup engineering team but in reality like 99.999% of SSH doesn’t use CAs, JFWIW. (I know you know this but just for the benefit of the thread).

          0 replies 0 retweets 1 like
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