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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. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      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.

      12 replies 66 retweets 203 likes
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    2. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      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.

      2 replies 0 retweets 8 likes
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    3. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      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.

      1 reply 0 retweets 6 likes
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    4. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      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?

      1 reply 0 retweets 14 likes
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    5. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      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*

      4 replies 0 retweets 12 likes
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    6. Scott Arciszewski‏ @CiPHPerCoder 29 Oct 2018
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      Replying to @colmmacc

      "Forget to escape a parameter and boom" Escaping is _the wrong tool for the job_. https://paragonie.com/blog/2015/05/preventing-sql-injection-in-php-applications-easy-and-definitive-guide …

      1 reply 0 retweets 1 like
      Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Replying to @CiPHPerCoder

      I take your point, but are you seriously be replying to "the wrong tool for the job" with a link to ... PHP?

      2:50 PM - 29 Oct 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Scott Arciszewski‏ @CiPHPerCoder 29 Oct 2018
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          Replying to @colmmacc

          I've had this conversation many times in the past year or so, so to save us both time, can I just link to the most succinct discussion instead of engaging in a rehash?

          1 reply 0 retweets 1 like
        3. Scott Arciszewski‏ @CiPHPerCoder 29 Oct 2018
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          Replying to @CiPHPerCoder @colmmacc

          ("This conversation" meaning "General disdain for PHP especially from security professionals".)https://github.com/google/tink/issues/104 …

          1 reply 0 retweets 1 like
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