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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. Justin Schuh  😷‏ @justinschuh 18 Mar 2018
      • Report Tweet
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      Replying to @BRIAN_____ @tehjh and

      I'm honestly curious what podcasts you listen to? Everyone I know relies on in-show advertising (often promo codes) or a donation model. I've never even heard of a podcast that requires authentication.

      0 replies 0 retweets 1 like
    2. Justin Schuh  😷‏ @justinschuh 18 Mar 2018
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      Replying to @lcamtuf @BRIAN_____ and

      Cool, an example. But... uh... you don't actually listen to this, do you? 😕

      0 replies 0 retweets 2 likes
    3. Alex Russell‏ @slightlylate 18 Mar 2018
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      Replying to @lcamtuf @justinschuh and

      I have a dumb thought, allow me to burden you with it! So the issue is "publicness", right? How do we know this fetch won't hit an internal system. How about we force public DNS lookup + TLS? We have a DOH resolver, why not use it here?

      2 replies 0 retweets 2 likes
    4. Jann Horn‏ @tehjh 18 Mar 2018
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      Replying to @slightlylate @lcamtuf and

      so an internal service would be considered public if it's reachable over https (which should ideally be the case) and the service has a valid cert for some name in public DNS that points at it? overloading TLS cert meaning with "I trust the owners of these domains"?

      1 reply 0 retweets 0 likes
    5. Jann Horn‏ @tehjh 18 Mar 2018
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      Replying to @tehjh @slightlylate and

      how do you pick the trusted public-DNS resolver you need for this?

      1 reply 0 retweets 0 likes
    6. Alex Russell‏ @slightlylate 18 Mar 2018
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      Replying to @tehjh @lcamtuf and

      We operate such a service today. Idea is we resolve these request's host *only* via that path, and cert must line up with resolved IP. Can make it configurable as a (new) group policy (and disableable) for the paranoid. I'm sure there's a hole in this... 🤔🤔🤔

      1 reply 0 retweets 0 likes
    7. Jann Horn‏ @tehjh 18 Mar 2018
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      Replying to @slightlylate @lcamtuf and

      are you proposing leaking hostnames to Google independent of normal OS DNS settings?

      1 reply 0 retweets 1 like
    8. Alex Russell‏ @slightlylate 18 Mar 2018
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      Replying to @tehjh @lcamtuf and

      Or whomever else you set as your "public only" resolver, yes. If the issue is DNS being overloaded for public/private (and another decade+ of this debate about something *every native app can do*), let's disentangle DNS.

      1 reply 0 retweets 0 likes
      Jann Horn‏ @tehjh 18 Mar 2018
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      Replying to @slightlylate @lcamtuf and

      and if the "public only" resolver lies to you, your internal network gets exposed to the internet?

      10:53 PM - 18 Mar 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Jann Horn‏ @tehjh 18 Mar 2018
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          Replying to @tehjh @slightlylate and

          and how do you pick the default resolver, given that the OS has no infrastructure for telling you what it is? default to Google? what should other browsers do?

          1 reply 0 retweets 1 like
        3. Alex Russell‏ @slightlylate 18 Mar 2018
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          Replying to @tehjh @lcamtuf and

          Other browsers can do whatever they think is right for users (e.g., SafeBrowsing). Default situation is these requests fail (as they do today) and some services will run transitional proxies. Others won't. Cest la vie.

          1 reply 0 retweets 0 likes
        4. 4 more replies
        1. Alex Russell‏ @slightlylate 18 Mar 2018
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          Replying to @tehjh @lcamtuf and

          If internal system presents valid TLS cert for that IP/host combination. We could extend DOH lookups to return public key info to ensure you're hitting the public version?

          0 replies 0 retweets 0 likes
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