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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. Luke Valenty‏ @TinyFPGA Feb 25

      New bootloader, programmer, and metadata all working together for the first time.pic.twitter.com/5OkimI7yGp

      2 replies 2 retweets 15 likes
      Show this thread
    2. OSS FPGA tools‏ @ico_TC Feb 26
      Replying to @TinyFPGA

      Do you make available programmer sw for Win, Mac and Linux?

      1 reply 0 retweets 0 likes
    3. Luke Valenty‏ @TinyFPGA Feb 26
      Replying to @ico_TC

      It’s implemented in Python. It works on all platforms.

      1 reply 0 retweets 1 like
    4. OSS FPGA tools‏ @ico_TC Feb 26
      Replying to @TinyFPGA

      USB libs can be a PITA

      2 replies 0 retweets 0 likes
    5. Robert Ou‏ @rqou_ Feb 26
      Replying to @ico_TC @TinyFPGA

      I believe I have a "fun" technique to get well-supported (even/especially in browsers, no annoying permission prompts required) USB device access. Going to keep it a secret for now until I actually test it because it's very very "wtf?"-inducing.

      3 replies 1 retweet 6 likes
    6. Robert Ou‏ @rqou_ Feb 26
      Replying to @rqou_ @ico_TC @TinyFPGA

      Alright, just to state it again on the bird website, I think you can get security-prompt-free access to a USB device by pretending to be a U2F dongle. Smuggle data to the device in the keyhandle and smuggle replies from the device in the signature. Still need to test this though.

      3 replies 1 retweet 5 likes
    7. Rich Felker‏ @RichFelker Feb 28
      Replying to @rqou_ @ico_TC @TinyFPGA

      Rich Felker Retweeted Rich Felker

      See this related thread.https://twitter.com/RichFelker/status/920651800797118466 …

      Rich Felker added,

      Rich Felker @RichFelker
      Replying to @RichFelker @hanno
      I wonder if any drivers/sw for usb crypto modules implement this protection.
      1 reply 0 retweets 0 likes
    8. Robert Ou‏ @rqou_ Feb 28
      Replying to @RichFelker

      My proposal isn't for exfiltrating keys from real U2F devices (which they are really supposed to defend against). I'm proposing building a new piece of hardware that isn't a crypto device at all (think an Arduino) but just abuses the protocol to transfer arbitrary data to JS.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Feb 28
      Replying to @rqou_

      Right. The key idea was that the browser should be validating that the data returned from the U2F device is a legitimate signature for the pubkey.

      12:01 PM - 28 Feb 2018
      1 reply 0 retweets 0 likes
        1. Robert Ou‏ @rqou_ Feb 28
          Replying to @RichFelker

          If I'm reading the specs correctly (again, I still need to actually go test this) the browser isn't guaranteed to even have the pubkey available. The pubkey is only returned when initially registering a dongle and not if you only ever abuse "authenticate" messages.

          0 replies 0 retweets 0 likes
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