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arturjanc's profile
Artur Janc
Artur Janc
Artur Janc
@arturjanc

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Artur Janc

@arturjanc

Making the web platform more secure one Twitter flamewar at a time.

Zurich, Switzerland
Joined February 2012

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    1. Mike West‏ @mikewest Jan 26

      Redundancsp ˈɹɪdʌndən̩(t)siː-ɛs-piː 1. The phrase "CSP policy"

      1 reply 0 retweets 6 likes
    2. Mike West‏ @mikewest Jan 26

      The more policies I look at in the wild, the more convinced I am that we need to wrap up CSP3, then start over with something more straightforward, like https://mikewest.github.io/artur-yes/ .

      3 replies 0 retweets 6 likes
    3. koto‏ @kkotowicz Jan 26
      Replying to @mikewest

      The problem with ARTUR (not to confuse with @arturjanc) is the implied nonce propagation. Not a good safe choice, given what I know about unintended dynamic script loads in most FWs. Still, start from scratch is good.

      1 reply 0 retweets 2 likes
    4. Mike West‏ @mikewest Jan 26
      Replying to @kkotowicz @arturjanc

      I agree that emulating `'strict-dynamic'` seems like something that should be off by default. That document's not terribly well thought-through, but seems like a good starting point for a reboot.

      2 replies 0 retweets 0 likes
    5. koto‏ @kkotowicz Jan 26
      Replying to @mikewest @arturjanc

      Totally. A reboot will have an adoption disadvantage, the longer works on the legacy solution take. If we already know how to design a better thing, why spending time on a known-bad?

      1 reply 0 retweets 0 likes
    6. Artur Janc‏ @arturjanc Jan 26
      Replying to @kkotowicz @mikewest

      To borrow a page from IETF's book: "We believe in rough consensus and running code." New more elegant mechanisms are great, but they take time and don't always end up shipping. However unsatisfying, ugly existing mechanisms which do the job... do the job.

      1 reply 0 retweets 0 likes
    7. koto‏ @kkotowicz Jan 26
      Replying to @arturjanc @mikewest

      "Which do the job"... of confusing devs and security team mostly, as exemplified by pentest results, numerous papers, and my humble experience. In practice, I'm afraid CSP doesn't work (for XSS) nearly as well as it's been expected of it.

      1 reply 0 retweets 0 likes
      Artur Janc‏ @arturjanc Jan 26
      Replying to @kkotowicz @mikewest

      Absolutely no argument from me regarding developer confusion, etc. I mean "do the job" in the narrow sense of already supporting those restrictions that we'd want to port to the New Thing (e.g. requiring nonces/hashes to execute scripts).

      1:33 AM - 26 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. koto‏ @kkotowicz Jan 26
          Replying to @arturjanc @mikewest

          Understood. But there is already full support for those in major UAs. Why keep fiddling with the CSP still? Isn't it better to just move on and work on the reboot?

          2 replies 0 retweets 1 like
        3. Artur Janc‏ @arturjanc Jan 26
          Replying to @kkotowicz @mikewest

          I think this is exactly what @mikewest is suggesting :) The main thing is that "fiddling" with CSP3 results in features which help solve the problems mentioned by @0x6D6172696F (e.g. hashes for event handlers instead of 'unsafe-inline') *and* have a chance of shipping this year.

          0 replies 0 retweets 0 likes
        4. End of conversation

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