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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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    1. Colm MacCárthaigh‏ @colmmacc Oct 29

      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.

      14 replies 68 retweets 161 likes
      Show this thread
    2. Colm MacCárthaigh‏ @colmmacc Oct 29

      When I say TERRIBAD, I mean that unless you've got the resources of a big security dept and folks who comb threat models for a living, using clients certs and mutual auth probably materially lessens your security. That's NUTS! Let me recount the many ways.

      3 replies 0 retweets 7 likes
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    3. Colm MacCárthaigh‏ @colmmacc Oct 29

      O.k some background. So Mutual Auth TLS, also called Client Auth TLS, or Client Certs, or MTLS, are all names for that crazy setup where you generate or give certificates to your clients and have them connect into your service. Seen in Intranets and MySQL conf since 2000.

      2 replies 0 retweets 5 likes
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    4. Colm MacCárthaigh‏ @colmmacc Oct 29

      Let's start with the big elephant in the room: MTLS is one big GIGANTIC layering violation. Authenticating users at the channel/session/network layer ... for actions that happen at a higher layer, like HTTP requests, or SQL commands. How is that bad?

      2 replies 0 retweets 12 likes
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    5. Colm MacCárthaigh‏ @colmmacc Oct 29

      Well it means that trivial security issues like SQL injection and request smuggling in HTTP headers ARE STILL THINGS IN TWO THOUSAND AND EIGHTEEN. Forget to escape a parameter and boom .. the attacker than put requests right there in your "authenticated" stream. *HEAD DESK*

      7 replies 0 retweets 10 likes
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    6. Colm MacCárthaigh‏ @colmmacc Oct 29

      Come on people - we *give* you strongly signed requests, and SPIFFE and ISTIO still do this garbage? Drives me nuts.

      2 replies 0 retweets 5 likes
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    7. Brian Smith‏ @BRIAN_____ Oct 29
      Replying to @colmmacc

      Who is "we"? What thing gives us strongly-signed requests?

      1 reply 0 retweets 0 likes
    8. Colm MacCárthaigh‏ @colmmacc Oct 29
      Replying to @BRIAN_____

      it's a big "we" - I mean all cloud and SaaS providers for quite a while now.

      1 reply 0 retweets 0 likes
    9. Brian Smith‏ @BRIAN_____ Oct 29
      Replying to @colmmacc

      I don't understand (note: not a euphemism for "I disagree with") this part of the argument. Unless you're willing to use the cloud provider's SDK, signed requests/responses are difficult. If you do use the SDK then the SDK's already handled injection, right?

      1 reply 0 retweets 1 like
      Brian Smith‏ @BRIAN_____ Oct 29
      Replying to @BRIAN_____ @colmmacc

      Also, most people can't implement the consumer or producer side of request/response signing (canonicalization is hard; misunderstanding what is and isn't covered by sig is error-prone). Further, rightly or wrongly, people often want to mutate requests in middleware.

      4:57 PM - 29 Oct 2018
      0 replies 0 retweets 0 likes

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