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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. Benjamin Fry  🐞 🔫 🦀= ⚙️‏ @benj_fry Oct 14

      Benjamin Fry  🐞 🔫 🦀= ⚙️ Retweeted Benjamin Fry  🐞 🔫 🦀= ⚙️

      Ok, I think I like this! Here's the full PR with this new Restrict type: https://github.com/bluejekyll/trust-dns/pull/586#pullrequestreview-164511419 … I think this is worth a blog post, and after using it, I think it will help prevent bugs and especially issues like: https://rustsec.org/advisories/RUSTSEC-2018-0007.html … Feel free to leave feedback.https://twitter.com/benj_fry/status/1051117215645237254 …

      Benjamin Fry  🐞 🔫 🦀= ⚙️ added,

      Benjamin Fry  🐞 🔫 🦀= ⚙️ @benj_fry
      There’ve been a few bugs detected in the binary processors of trust-dns, being too trusting of foreign data. I’m considering adding a type, Restrict<T> that would add at a minimum a method that requires validation before usage, to help prevent overflowing math operations.
      Show this thread
      3 replies 0 retweets 2 likes
      Show this thread
      Brian Smith‏ @BRIAN_____ Oct 19
      Replying to @benj_fry

      IMO the problem is more with using bare `u8`, `u16`, etc. to represent things. Instead of `rdata_length: u16` or `rdata_length: Restrict<u16>` I'd use `rdata_length: RDataLength` where RDataLength's `TryFrom<u16>` validates the range and does any other validation.

      9:35 AM - 19 Oct 2018
      • 2 Likes
      • Benjamin Fry 🐞🔫🦀=⚙️ Tim McLean
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Benjamin Fry  🐞 🔫 🦀= ⚙️‏ @benj_fry Oct 19
          Replying to @BRIAN_____

          I agree, that the problem is the bare usage of primitives, but that's exactly what this change fixes, it forces those to be wrapped in a Restrict type when read from an untrusted, malicious source.

          1 reply 0 retweets 0 likes
        3. Benjamin Fry  🐞 🔫 🦀= ⚙️‏ @benj_fry Oct 19
          Replying to @benj_fry @BRIAN_____

          While the TryFrom approach would catch some issues, I think it would be very type heavy, as we'd need to create a bunch of single use types. What I liked about this approach is that we were able to chain all math operations without unwrapping the Restricted type.

          1 reply 0 retweets 0 likes
        4. Benjamin Fry  🐞 🔫 🦀= ⚙️‏ @benj_fry Oct 19
          Replying to @benj_fry @BRIAN_____

          I do see the value of you're suggestion, but I wanted something that could be used for all data read from a potentially malicious stream, it wouldn't preclude us from adopting the approach you suggest in the future.

          0 replies 0 retweets 0 likes
        5. End of conversation

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