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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Peter Bowen‏ @pzb May 23
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      One of the things that has surprised me about k8s and the CNCF projects is the love for authentication using mutual-auth TLS. Google ALTS seems to be common inspiration. I can't find many papers/blogs on why request auth is better than channel auth. Anyone have pointers?

      2 replies 5 retweets 18 likes
    2. David Murray‏ @fernomac May 23
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      Replying to @pzb

      David Murray Retweeted Colm MacCárthaigh

      https://mobile.twitter.com/colmmacc/status/1057017343438540801 … is the most comprehensive write-up I’ve seen on the topic

      David Murray added,

      Colm MacCárthaigh @colmmacc
      Ok. tweet thread time! Too long ago I promised to write a screed explaining how much I hated mutual-auth TLS and why. I got distracted, and I wasn't happy with the writing, so here it is in tweet thread form instead! But basically: Client certs and Mutual-Auth TLS is TERRIBAD.
      Show this thread
      2 replies 1 retweet 5 likes
    3. Peter Bowen‏ @pzb May 23
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      Replying to @fernomac

      Yes, and I've had the privilege of hearing @colmmacc talk about this in person. And I've had private discussions where many people I also respect have strong feelings about not using mTLS. But I'm failing at finding much about it publicly.

      1 reply 0 retweets 4 likes
    4. Tom Biskupic‏ @tom_biskupic May 23
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      Replying to @pzb @fernomac @colmmacc

      I am not sure I get (or don't agree with) some of his arguments - like just because you can send a SQL injection over an authenticated channel, somehow that is the authentication mechansms fault? I can send an SQL injection over a channel with basic auth too.

      1 reply 0 retweets 1 like
    5. David Murray‏ @fernomac May 23
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      Replying to @tom_biskupic @pzb @colmmacc

      I *think* the idea is that if you were to auth each statement instead of the channel, any injected statements would be unauthenticated? e.g. AS admin:hunter2 INSERT INTO students (name) VALUES (‘Robert’); DROP TABLE students; —‘);

      2 replies 0 retweets 1 like
      Colm MacCárthaigh‏ @colmmacc May 23
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      Replying to @fernomac @tom_biskupic @pzb

      I screwed up my SQL point. What I was thinking of is a truncation attack. Alice sends "DELETE FROM foo WHERE ... " but a MITM can truncate just before the WHERE and then trigger an EOF. Works over TLS if the attacker can align the records. Request auth is better.

      11:41 PM - 23 May 2020
      • 3 Likes
      • Nimrod Aviram Ryan Hurst David Murray
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Tim Dierks‏ @tdierks May 25
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          Replying to @colmmacc @fernomac and

          How is request auth here better? (I'm assuming by "request auth" you mean a bearer token.) Suffers from the same truncation attack. If you are referring to fully authenticated messages, agreed they have a number of benefits; I'm not certain why they're so thinly deployed.

          1 reply 0 retweets 1 like
        3. Colm MacCárthaigh‏ @colmmacc May 25
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          Replying to @tdierks @fernomac and

          I definitely do not mean a bearer token. Check out our SIGv4 algorithm; https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html …

          1 reply 0 retweets 1 like
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