34 lines
2 KiB
Text
34 lines
2 KiB
Text
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Tons of pairing work, which culminated today in pairing fully working for
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the very first time. And it works great! Type something like "my
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hovercraft is full of eels" into two git annex webapps on the same LAN
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and the two will find each other, automatically set up ssh keys, and sync
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up, like magic. Magic based on math.
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* Revert changes made to `authorized_keys` when the user cancels
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a pairing response. Which could happen if the machine that sent the
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pairing request originally is no longer on the network.
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* Some fixes to handle lossy UDP better. Particularly tricky at the end
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of the conversation -- how do both sides reliably know when a
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conversation is over when it's over a lossy wire? My solution is just
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to remember some conversatons we think are over, and keep saying
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"this conversation is over" if we see messages in that conversation.
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Works.
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* Added a UUID that must be the same in related pairing messages.
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This has a nice security feature: It allows detection of brute-force
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attacks to guess the shared secret, after the first wrong guess!
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In which case the pairing is canceled and a warning printed.
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* That led to a thorough security overview, which I've added to
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the [[pairing]] page. Added some guards against unusual attacks,
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like console poisioning attacks. I feel happy with the security
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of pairing now, with the caveats that only I have reviewed it (and
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reviewing your own security designs is never ideal), and that the
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out-of-band shared secret communication between users is only as good
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as they make it.
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* Found [a bug](https://github.com/yesodweb/yesod/issues/421)
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in Yesod's type safe urls. At least, I think it's a bug. Worked around it.
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* Got very stuck trying to close the sockets that are opened to send
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multicast pairing messages. Nothing works, down to and including calling
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C `close()`. At the moment I have a socket leak. :(
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I need to understand the details of multicast sockets better to fix this.
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Emailed the author of the library I'm using for help.
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