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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS

      At the moment the only option for us with full verified boot other than Nexus / Pixel devices would be having our own device manufactured...

      2 replies 1 retweet 3 likes
    2. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS

      Remote attestation might be something we'll end up wanting too and it looks like Google is providing a very basic implementation for us now.

      1 reply 0 retweets 3 likes
    3. Rich Felker‏ @RichFelker 17 Jun 2017
      Replying to @CopperheadOS

      I don't see how the very idea of remote attestation can be anything but malicious towards the user.

      1 reply 0 retweets 1 like
    4. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @RichFelker

      It can give users an easy way to confirm that they are running an install of CopperheadOS that hasn't been tampered with by an attacker.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      Remote can mean another device used to scan a QR code or a service that the user can run on their own server if they don't want to use ours.

      1 reply 0 retweets 0 likes
    6. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      The verified boot process is supposed to show our key fingerprint but it's impractical to manually verify and the size has been too small.

      1 reply 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      If they used alphanumeric characters for the fingerprint instead of hex it could be denser but still a lot to manually verify each boot.

      1 reply 0 retweets 0 likes
    8. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      There are mitigations to prevent changing the key without unlocking the bootloader but this can provide a much needed layer of defence.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      Google's key attestation setup provides a form of authentication for first usage to secure the pairing operating with basic authentication.

      1 reply 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 17 Jun 2017
      Replying to @CopperheadOS @RichFelker

      It'd be nice if we had a process for users to check for tampering or hardware swap when they receive their CopperheadOS device from us, etc.

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker 17 Jun 2017
      Replying to @CopperheadOS

      There's all sorts of tampering that can be done that wouldn't be detected, like adding touchscreen equivalent of a keylogger.

      3:46 PM - 17 Jun 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 17 Jun 2017
          Replying to @RichFelker @CopperheadOS

          If you want to protect integrity of the delivery, live stream video from inside the container from moment of shipping until arrival.

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @RichFelker

          If they need to open up the device and physically tamper with it, that's a big improvement over the current state of things.

          1 reply 1 retweet 0 likes
        4. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          Should at least be defending against attackers without the resources to design and stealthily apply some kind of hardware implant.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          Detection of physical tampering is also something that devices will probably end up being able to include in their attestation results.

          1 reply 0 retweets 1 like
        6. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          An attacker could extract the key used for attestation from the hardware. The point is to make it more expensive / difficult to do this.

          1 reply 0 retweets 0 likes
        7. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          We're not solely focused on trying to defend against sophisticated attackers doing very expensive, targeted attacks.

          1 reply 0 retweets 0 likes
        8. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          There are other niches for us like someone concerned about being spied on by a family member and Android / iOS both handle that very poorly.

          1 reply 1 retweet 1 like
        9. CopperheadOS‏ @CopperheadOS 17 Jun 2017
          Replying to @CopperheadOS @RichFelker

          Features don't have to be useful vs a $200k investment by the NSA, etc. to do a targeted attack on a specific person to be valuable.

          1 reply 0 retweets 0 likes
        10. 4 more replies

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