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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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    Brian Smith‏ @BRIAN_____ Sep 6

    Brian Smith Retweeted Jake Archibald

    Awesome post. The evidence presented should be enough to motivate other browsers to at least start investigating doing the same. It would be great to see more evidence, confirming or refuting, how much sharing a cache between sites actually matters.https://twitter.com/jaffathecake/status/1037741010871353344 …

    Brian Smith added,

    Jake Archibald @jaffathecake
    In Safari, their HTTP cache is somewhat partitioned by requesting origin. It's a neat feature, but it makes public CDNs a little less useful. @AndyDavies has the details: https://andydavies.me/blog/2018/09/06/safari-caching-and-3rd-party-resources/ …
    5:40 PM - 6 Sep 2018
    • 4 Likes
    • Carl Winbäck Benjamin Fry 🐞🔫🦀=⚙️ Watson Ladd eliza does nothing unless polled
    2 replies 0 retweets 4 likes
      1. New conversation
      2. "Daniel Carosone".parse().unwrap()‏ @redtwitdown Sep 6
        Replying to @BRIAN_____

        For firefox, see "Multi Account Containers" and "Temporary Containers". These are extensions, but they just provide UI for inherent functionality. There's also first party isolation standardised privacy feature, same as chrome.

        1 reply 0 retweets 0 likes
      3. Brian Smith‏ @BRIAN_____ Sep 6
        Replying to @redtwitdown

        Those features require too much thinking and planning by the user. We need automatic solutions.

        1 reply 0 retweets 1 like
      4. "Daniel Carosone".parse().unwrap()‏ @redtwitdown Sep 6
        Replying to @BRIAN_____

        with the caveat that it depends on the user (I'm far from typical) but yes, I agree. It clearly counts as "should start to investigate doing the same" though.

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. Tom Ritter‏ @TomRittervg Sep 6
        Replying to @BRIAN_____

        I'm not sure how valuable this is (privacy wise) unless you close all the holes (like resumption). In Firefox that's possible with containers or the (experimental) pref for first party isolation. In Tor Browser, it's on by default.

        1 reply 0 retweets 0 likes
      3. Ryan Sleevi‏ @sleevi_ Sep 6
        Replying to @TomRittervg @BRIAN_____

        And H/2. And socket pools.

        1 reply 0 retweets 0 likes
      4. Tom Ritter‏ @TomRittervg Sep 6
        Replying to @sleevi_ @BRIAN_____

        If you find a bypass in h2, you'll get a bounty from Tor :) Socket pools maybe not though; since they don't use that code.

        1 reply 0 retweets 0 likes
      5. Ryan Sleevi‏ @sleevi_ Sep 6
        Replying to @TomRittervg @BRIAN_____

        You're saying that H/2 coalescing is disabled, and distinct socket pools per keyed origin are used? Any pointers to the source?

        1 reply 0 retweets 0 likes
      6. Tom Ritter‏ @TomRittervg Sep 6
        Replying to @sleevi_ @BRIAN_____

        They should be! I'll go look tomorrow. :)

        1 reply 0 retweets 1 like
      7. Tom Ritter‏ @TomRittervg Sep 7
        Replying to @TomRittervg @sleevi_ @BRIAN_____

        H2 Coalescing is here: https://searchfox.org/mozilla-central/source/netwerk/protocol/http/Http2Session.cpp#2702 … which flows to https://searchfox.org/mozilla-central/source/netwerk/protocol/http/nsHttpConnectionMgr.cpp#762 …. OriginAttributes always contains a Container ID (if you don't have containers it's 0) and if you have FPI enabled, the first party origin. cc @mcmanusducksong

        1 reply 0 retweets 1 like
      8. Tom Ritter‏ @TomRittervg Sep 7
        Replying to @TomRittervg @sleevi_ and

        Socket Pools is governed the same way, in https://searchfox.org/mozilla-central/source/netwerk/protocol/http/nsHttpConnectionMgr.cpp#1893 … I did find some scary things about setting the socket reuse: https://searchfox.org/mozilla-central/search?q=symbol:F_%3CT_7d320e23007bb462%3E_4&redirect=false … but comments and discussions indicate this is used safely, only for ICE TCP or local net stuff.

        1 reply 0 retweets 1 like
      9. Tom Ritter‏ @TomRittervg Sep 7
        Replying to @TomRittervg @sleevi_ and

        So that part isn't very robust and might have some lurking issues but hopefully if present, they're limited. Bypasses welcome =)

        0 replies 0 retweets 1 like
      10. End of conversation

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