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patio11's profile
Patrick McKenzie
Patrick McKenzie
Patrick McKenzie
@patio11

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Patrick McKenzie

@patio11

I work for the Internet, at @stripe, mostly on accelerating startups. Opinions here are my own.

東京都 Tokyo
kalzumeus.com
Joined February 2009

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    1. Patrick McKenzie‏ @patio11 14 Jan 2016
      • Report Tweet
      • Report NetzDG Violation

      Today I learned that SSH will, by default, try sending every SSH key you have to every server you connect to.

      21 replies 91 retweets 125 likes
      Patrick McKenzie‏ @patio11 14 Jan 2016
      • Report Tweet
      • Report NetzDG Violation

      "But what if you use 'IdentityFile ~/.ssh/some_unique_key' ?" You'd think, right! But did you remember to use "IdentitiesOnly yes" ?

      9:41 AM - 14 Jan 2016
      • 8 Retweets
      • 31 Likes
      • Wes Oldenbeuving Ben Ng 😷 ✩ Philipp 🗸 Jolyon Brown Eli Courtwright Lucas paul shinn tuan kuranes Tomás Touceda
      5 replies 8 retweets 31 likes
        1. New conversation
        2. Matthew Lehner‏ @matthewpearse 14 Jan 2016
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          Replying to @patio11

          @patio11 @tcannonfodder Wrote a great post about this, coming from a slightly different angle a while back: https://thomascannon.me/posts/fix-ssh-keys/ …

          2 replies 1 retweet 4 likes
        3. Thomas Cannon‏ @tcannonfodder 14 Jan 2016
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          Replying to @matthewpearse

          @matthewpearse @patio11 ah, right, thanks Matt! Glad like it! 😄

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Chris Siebenmann‏ @thatcks 14 Jan 2016
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          Replying to @patio11

          @patio11 Even IdentitiesOnly's not necessarily sufficient. The rabbit hole goes too deep for 140 characters: https://utcc.utoronto.ca/~cks/space/blog/sysadmin/SSHConfigIdentities …

          0 replies 0 retweets 3 likes
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        1. New conversation
        2. Ryan Castellucci  🏠‏ @ryancdotorg 14 Jan 2016
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          Replying to @patio11

          @patio11 "IdentityFile x\nHost A\n\tIdentityFile y\n\tIdentitiesOnly yes" will send key x, then key y when connecting to A.

          2 replies 0 retweets 1 like
        3. Ryan Castellucci  🏠‏ @ryancdotorg 14 Jan 2016
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          Replying to @ryancdotorg

          @patio11 Ran into this a few years back and wrote this patch: https://gist.github.com/ryancdotorg/5079621 …

          0 replies 0 retweets 1 like
        4. End of conversation
        1. Robin Verton‏ @RobinVerton 14 Jan 2016
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          Replying to @patio11

          @patio11 there was a nice PoC of identifying you with this behaviour: https://blog.filippo.io/ssh-whoami-filippo-io/ …

          0 replies 0 retweets 2 likes
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        1. Ryan Castellucci  🏠‏ @ryancdotorg 14 Jan 2016
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          Replying to @patio11

          @patio11 IdentityFile does not specify a single identity to use even with IdentitiesOnly. It adds that identity to a list. (cont'd)

          0 replies 0 retweets 1 like
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