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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori Sep 2

      But with the OAuth model, you would have to put the entire application in a secure enclave, from the storage right on down to the part where the HTTPS packet gets encoded, which seems terrible for performance.

      5 replies 0 retweets 11 likes
      Show this thread
    2. peterix‏ @peterixxx Sep 3
      Replying to @cmuratori

      It's basically impossible to secure any of this, because at some point, you are sending a 'bearer token' that will be taken at face value. It can be intercepted and reused freely. OAuth2 is not secure from my POV.

      1 reply 0 retweets 0 likes
    3. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      A more sensible approach would be to set up a key pair between the service and the client, where the client generates it and securely stores the private key. The service stores the public key along with your account.

      1 reply 0 retweets 0 likes
    4. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      You start a session by service challenging the client with a nonce, which is signed by client and used only for that session. Effectively, you gain a way to revoke access immediately instead of blindly trusting bearer tokens until expiration timestamp.

      1 reply 0 retweets 0 likes
    5. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      AND the session tokens can be extremely short lived... which would make abusing them much harder if intercepted/leaked.

      1 reply 0 retweets 0 likes
    6. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      Why I would want the server giving you a nonce is resilience against replay attacks. You don't want to be able to just resend a request someone else made before and get the answer out of it.

      1 reply 0 retweets 0 likes
    7. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      What I thionk happened with OAuth2 is that people sacrificed security for scalability. If you have one 'server private key' and sign the tokens with that, you can verify that in completely disconnected systems. In the process, you threw away the capability to revoke access.

      1 reply 0 retweets 0 likes
    8. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      And made it so that the tokens, when leaked, can let anyone impersonate the client.

      1 reply 0 retweets 0 likes
    9. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      This is actually terrible if you are in an environment that breaks https (MITM proxy pretending to be all domains) and does not give you any other options. It's very much susceptible to abuse.

      1 reply 0 retweets 0 likes
    10. peterix‏ @peterixxx Sep 3
      Replying to @peterixxx @cmuratori

      In other words, if you are looking at this from a green field perspective and security in mind, avoid OAuth2 completely.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori Sep 3
      Replying to @peterixxx

      I agree with this. Unfortunately, it seems that most payment providers do not :(

      12:25 PM - 3 Sep 2021
      0 replies 0 retweets 0 likes

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