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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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      We're still only GETTING WARMED UP btw!

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    2. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Let's ask the most important question in the design of any AAA system: how do we handle the inevitable compromise of the credentials? So what are the common answers ...

      2 replies 0 retweets 5 likes
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    3. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      I have never ever ever, not once, seen a working revoking system. In THEORY there's this idea that the bad cert can be listed in a CRL, and the servers all refresh it and we're good. I've seen half solutions at best. Common problem ...

      1 reply 0 retweets 15 likes
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    4. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      What if you need to replace *ALL* your credentials? "This would never happen!" ... except Heartbleed, and the Debian RNG bug, and those Eastern European smart cards, and, and ...

      1 reply 0 retweets 8 likes
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    5. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      and how do you update the clients quickly? Do you have a way to prompt people or let them know? PASSWORDS are so much better at all of this!

      1 reply 0 retweets 3 likes
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    6. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Can you grow your CRL infinitely for it all? NO? So you need a story for root key revocation anyway?? Oh man. Who has this stuff down? No-one is who.

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    7. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      So instead people use "short certs". O.k. first let me point out that the security of this solution depends on how secure your server clocks are. If I can spoof NTP ... it was all .. dumb ... anyway.

      1 reply 0 retweets 6 likes
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    8. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Next, let me ask, is there ANY good value for length of time here? Make it too short and you're going to have a lot of outages due to failure to renew certs quickly enough, Too long and it's not secure.

      1 reply 0 retweets 6 likes
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    9. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Google's ALTS dodged a lot of this by having epochs that end up being a mix of time and CRL-like strategies. Smart move and dampens the tyre-fire somewhat. Never seen in the wild though!

      1 reply 0 retweets 5 likes
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    10. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Now we get to my LEAST favorite part ... there are basically NO standards for logging credentials from certs, or for implementing authz. So admins just make up their own.

      1 reply 0 retweets 10 likes
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      Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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      Enter an MTLS infrastructure and you have to cross your fingers that they are even logging the user's names. NIGHTMARE to debug.

      2:37 PM - 29 Oct 2018
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      • foxgrrl or just very powerful light Deirdre Connolly¹ Jaurieres Sander Demeester
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        2. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          And for authz the admins get "creative". Because certs basically encode strings, people start using them as arbitrary bearer tokens. Let's put group permissions in the cert itself, encoded in strings ... and then do access control with ... REGEXes!!

          1 reply 0 retweets 13 likes
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        3. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          ACTUAL SECURITY ISSUE I SAW IN THE WILD: The "administrative-assistants" has root-level access to everything for years, because their group name started with "admin" and the regex letting them in lacked a $ terminator!!

          1 reply 2 retweets 45 likes
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        4. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          Disclaimer: they were using Apache 2.0, and I wrote that regex supporting madness, and so it is my fault and I will pay for my sins.

          1 reply 0 retweets 28 likes
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        5. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          Anyway, back to MTLS, it is a hodgepodge of awfulness. Massive code base to implement, terrible standards in the middle, and just obscure untested garbage left and right. RUN AWAY!

          1 reply 3 retweets 6 likes
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        6. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          Yet it gets a reputation for being a best practice, maybe because it's hard, or because it has a halo from the false talisman of cryptography. *shudder* BAD, BAD, TERRIBAD.

          2 replies 0 retweets 10 likes
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        7. Colm MacCárthaigh‏ @colmmacc 29 Oct 2018
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          Anyway, that's the rant out of my system! AMA about MTLS if you want, and dear @Unrollme - please unroll this thread.

          3 replies 1 retweet 15 likes
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        8. End of conversation

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