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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 7 Apr 2019
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      Unfortunately we had a few customers stuck though; their OpenSSL libraries were embedded in commercial software that they couldn't quickly upgrade. One of our VPs reached out "Is there anything we can do here?"

      1 reply 2 retweets 61 likes
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    2. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      So at about 2AM, I wrote a Netfilter plugin that could block heart bleed using the Linux Kernel firewall. It's still on GitHub ... https://github.com/colmmacc/nf_conntrack_tls … , it tracks the TLS record layer state machine and would drop any heartbeat messages. Crude but effective.

      1 reply 17 retweets 210 likes
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    3. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      In our annual planning, we had raised the idea of writing our own TLS/SSL implementation because we thought we could better, but it was a nascent plan. Well that went from nascent to DO IT NOW. I started writing when became Amazon s2n.

      2 replies 7 retweets 96 likes
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    4. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      It took about 5 weekends, just me, and there's something very special about finally getting a bunch of code together and seeing it work in a browser. It took a little longer, and 3 intense security reviews, to get approval to Open Source it, but our CEO was very supportive.

      4 replies 4 retweets 113 likes
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    5. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      Now it's widely used across AWS. Blows my mind to think that S3 is using it!https://github.com/awslabs/s2n 

      1 reply 9 retweets 150 likes
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    6. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      s2n is coded specifically in a way to try to avoid the problem heartbleed hit. Rather than parse memory into integers using pointers directly, all across the code, s2n uses a "stuffer" data structure that includes a cursor. Similar to BoringSSL's crypto_bytes, or DJB's stralloc.

      1 reply 5 retweets 103 likes
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    7. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      Oh BoringSSL! In the months after HeartBleed, the industry rallied to get OpenSSL more funding and support through the core infrastructure initiative. We still take part! And the BoringSSL and LibreSSL forks of OpenSSL happened. Great work from each!

      1 reply 2 retweets 81 likes
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    8. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      The next year, the amazing @BenLaurie and @trevp__ started an annual High Assurance Cryptography workshop after @RealWorldCrypto, that has also born fruits and helped us produce tools that can analyze cryptography code and find even subtle problems.

      2 replies 2 retweets 63 likes
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    9. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      I'm almost done, but before I finish, I kind of depressing twist on this whole thing: The Heart Beat extension never really made any sense to begin with. A 0-byte record could have been used as a keep-alive, and ordinary path MTU discovery works for UDP!

      3 replies 7 retweets 108 likes
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    10. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      All of this trouble for a feature that to this day I can't even think of a good use case for. This is one reason why "Don't do less well. Do less, well." resonates with me as a motto.

      2 replies 50 retweets 338 likes
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      Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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      That's my story for now, until I remember something I forgot. Thanks to everyone who moved mountains 5 years ago. I'm in JFK waiting to fly to Bucharest, so AMA!

      11:19 AM - 7 Apr 2019
      • 3 Retweets
      • 219 Likes
      • Andrew Hammond 🤘🏻 Walter M Vargas-Pena jobelenus.eng🏴 Oren Reuveni Worathiti Pung Joel DeTeves 🇨🇦 Trading my way to 100k Social Distancing Schick Billy Becker Maxwell🌸
      16 replies 3 retweets 219 likes
        1. New conversation
        2. Matthew S. Wilson‏ @_msw_ 7 Apr 2019
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          Replying to @colmmacc

          What time are you landing at OTP? :-)

          1 reply 0 retweets 2 likes
        3. Colm MacCárthaigh‏ @colmmacc 7 Apr 2019
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          Replying to @_msw_

          AMS first, then OTP at 1:30PM local time!

          0 replies 0 retweets 0 likes
        4. End of conversation
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        2. Peter Bowen‏ @pzb 7 Apr 2019
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          Replying to @colmmacc

          In addition to s2n, Heartbleed also triggered the creation of AWS Certificate Manager. At the beginning of 2014, we were working on a project to start a public CA at AWS.

          1 reply 3 retweets 20 likes
        3. Peter Bowen‏ @pzb 7 Apr 2019
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          Replying to @pzb @colmmacc

          We heard from customers that certificates were expensive and hard to buy, so we were trying to fix that pain point. At the time, to use certificates on AWS, you uploaded your key and certificate chain to AWS IAM.

          1 reply 0 retweets 7 likes
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        1. Parisa Tabriz‏Verified account @laparisa 7 Apr 2019
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          Replying to @colmmacc

          Fun read. Thanks for sharing!

          0 replies 0 retweets 3 likes
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        2. James Bromberger #WFH‏ @JamesBromberger 8 Apr 2019
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          Replying to @colmmacc

          I was on stage at the AWS Sydney Summit the day after this; the first that many customers heard about Heartbleed was at the same time that all ELBs worldwide had been patched. Many relieved faces in the audience.

          1 reply 0 retweets 1 like
        3. James Bromberger #WFH‏ @JamesBromberger 8 Apr 2019
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          Replying to @JamesBromberger @colmmacc

          Was also nice to point out how AWS Secret keys were unlikely to be compromised by this on API endpoints (Secret keys never traverse the wire after issuance).

          0 replies 0 retweets 1 like
        4. End of conversation
        1. Kevin Burke‏ @derivativeburke 7 Apr 2019
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          Replying to @colmmacc

          Can you say more about the logistics of hotpatching OpenSSL & deploying the patch? This is not trivial at a lot of companies with baked images etc

          0 replies 0 retweets 1 like
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        1. Retsim Retrac‏ @llamper 7 Apr 2019
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          Replying to @colmmacc

          Did Bezos make sure you got a good bonus that year (or was it the usual jam-tomorrow stuff)?

          0 replies 0 retweets 1 like
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        1. Aaron Brailsford‏ @aaronjb 8 Apr 2019
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          Replying to @colmmacc

          As someone working in the industry, I don't know where to begin with how impressive the almost throw-away "I wrote a TLS/SSL implementation in 5 weekends, on my own" is; or how I would be completely paralyzed by the fear of making the same mistakes as OpenSSL..

          0 replies 0 retweets 1 like
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