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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 16 Jan 2020
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      To clarify the Windows crypto fail: The problem isn't in signature validation. The problem is the *root store/cache*. CryptoAPI considers an (attacker-supplied) root CA to be in the trust store if its public key and serial match a cert in the root store, Ignoring curve params.

      11 replies 203 retweets 528 likes
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      Hector Martin‏ @marcan42 16 Jan 2020
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      So it's not that Windows uses the wrong curve parameters or anything like that, it's that at some point the key used to index into a validated cert cache is (serial, pub) when it should be (serial, pub, params). As they say, one of the hardest problems in CS is caching.

      5:41 AM - 16 Jan 2020
      • 37 Retweets
      • 172 Likes
      • Wayne Werner Ionuț Ambrosie SwitHak (🎯) Paul Préfontaine Ben Higgins Ulrich Austin Clark _yossi_ Jared Maxwell
      10 replies 37 retweets 172 likes
        1. New conversation
        2. Pillow‏ @CounterPillow 16 Jan 2020
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          Replying to @marcan42

          one of the hardest problems in CS is finding the right touhou picture to use as your avatar on social media

          1 reply 0 retweets 6 likes
        3. CodeAsm | Panda  🐼‏ @CodeAsm_ 16 Jan 2020
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          Replying to @CounterPillow @marcan42

          They should atleast be cute right?

          0 replies 0 retweets 0 likes
        4. End of conversation
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        2. Tavian Barnes‏ @tavianator 16 Jan 2020
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          Replying to @marcan42

          Why are the params not part of the serial?

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 16 Jan 2020
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          Replying to @tavianator

          What do the params have to do with the serial? The serial is just an arbitrary serial number.

          1 reply 0 retweets 0 likes
        4. Show replies
        1. Friedemann Wachsmuth‏ @peaceman 16 Jan 2020
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          Replying to @marcan42

          Thanks for this excellent and comprehensive explanation.

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
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        2. Kevin Hill‏ @CyborgTribe 16 Jan 2020
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          Replying to @marcan42

          Is it easier to find params that generate an arbitrary pub key than to find a pub key given the params? Aren't both roughly just at hard? What am I missing?

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 16 Jan 2020
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          Replying to @CyborgTribe

          What you're trying to find is the private key given the public key. You cannot find the original private key for the original params, but you can trivially craft parameters in such a way to make a private key of 1 "happen" to correspond to the original public key.

          0 replies 1 retweet 4 likes
        4. End of conversation
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        2. Dan Kaminsky‏Verified account @dakami 16 Jan 2020
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          Replying to @marcan42

          Presumably, only for ECC...ah, because only ECC has params significant/agile in this manner?

          1 reply 0 retweets 1 like
        3. Hector Martin‏ @marcan42 16 Jan 2020
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          Replying to @dakami

          Yup.

          1 reply 0 retweets 1 like
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        2. Conrado Gouvea‏ @conradoplg 17 Jan 2020
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          Replying to @marcan42 @sleevi_

          I wonder why does it even touch the supplied CA certificate. Shouldn't it simply get the CA certificate from the trusted store, keyed by the signer Subject/KeyID listed in the child certificate?

          1 reply 1 retweet 0 likes
        3. James Forshaw‏ @tiraniddo 17 Jan 2020
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          Replying to @conradoplg @marcan42 @sleevi_

          I'd suspect it's because the chain verification is distinct from whether the chain is trusted by policy. Therefore you supply the full chain with the bogus cert, which checks out okay. Then the trust is checked, it compares AuthKeyIDs and find a matching trusted root. Job done!

          1 reply 1 retweet 3 likes
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