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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. Nick Sullivan‏Verified account @grittygrease 18 Mar 2019
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      Monsters in the Middleboxes: a new blog post by @gabbifish and @lukevalenta highlighting recent work on the measurement of TLS-inspecting proxies. We also open sourced our code (https://github.com/cloudflare/mitmengine …) and built a dashboard (https://malcolm.cloudflare.com/ ).https://blog.cloudflare.com/monsters-in-the-middleboxes/ …

      6 replies 87 retweets 182 likes
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    2. Ivan Ristic‏ @ivanristic 18 Mar 2019
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      Replying to @grittygrease @gabbifish @lukevalenta

      I don’t understand how Akamai can intercept anything if they’re a reverse proxy; can you clarify?

      1 reply 0 retweets 7 likes
    3. Nick Sullivan‏Verified account @grittygrease 18 Mar 2019
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      Replying to @ivanristic @gabbifish @lukevalenta

      We measure unexpected differences between the HTTP headers and the client hello. Some customers put Akamai in front of Cloudflare, so the TLS layer matches Akamai's upstream fetching service but the HTTP headers match the browser.

      2 replies 0 retweets 5 likes
    4. Ivan Ristic‏ @ivanristic 18 Mar 2019
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      Replying to @grittygrease @gabbifish @lukevalenta

      In that case, the terminology is misleading. There is no interception happening in the case of Akamai. They’re merely terminating HTTPs traffic as configured by site owners. You should remove reverse proxies from the stats.

      1 reply 2 retweets 9 likes
    5. Nick Sullivan‏Verified account @grittygrease 18 Mar 2019
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      Replying to @ivanristic @gabbifish @lukevalenta

      I agree about removing the term interception, we'll do that. Reverse proxies don't intercept because DNS is legitimately pointing to them. However, they do break the end-to-end property with respect to the Browser<->CF connection.

      1 reply 0 retweets 2 likes
      Colm MacCárthaigh‏ @colmmacc 18 Mar 2019
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      Replying to @grittygrease @ivanristic and

      *cough* *cough*. In this context, CloudFlare is no more an "end" than Akamai (or CloudFront, or ELB) is.

      11:49 AM - 18 Mar 2019
      • 10 Likes
      • ᗩᖇᗩᐯIᑎᗪ ᗩᒍᗩᗪ Vincent Juamei Rich Felker Keith 🔰🐈🥑🏴 Rich Salz Markus Ritzmann Bert Hubert 🇪🇺 Unix McBeard
      1 reply 0 retweets 10 likes
        1. Nick Sullivan‏Verified account @grittygrease 18 Mar 2019
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          Replying to @colmmacc @ivanristic and

          Right, but we can only show what we can measure. An Apache server on a VPS is also not an "end" if the database it communicates with is somewhere else. The salient point is whether or not the browser's TLS stack and security features have been applied to the connection to CF.

          0 replies 0 retweets 1 like
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