Secure channel / install mode #35
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bjyoungblood
commented
Mar 13, 2023
| @@ -99,6 +99,7 @@ defmodule Jeff.Message do | |||
| defp do_scs(:reply, 0x76, _), do: 0x12 | |||
| defp do_scs(:command, 0x77, _), do: 0x13 | |||
| defp do_scs(:reply, 0x78, _), do: 0x14 | |||
| defp do_scs(:command, id, true) when id in [0x60, 0x64, 0x65, 0x66, 0x67], do: 0x15 | |||
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I think this was the most critical change to get things to work -- commands with no data payload need to use SCS 0x15.
It would have been nice to calculate this based on the actual payload length, but that was a bigger refactor than I wanted to do, and there are a fixed number of commands with no payload.
bjyoungblood
commented
Mar 13, 2023
Comment on lines
+126
to
+136
| def next_command( | ||
| %{ | ||
| security?: true, | ||
| install_mode?: true, | ||
| secure_channel: %{established?: true, scbkd?: true}, | ||
| address: address | ||
| } = device | ||
| ) do | ||
| command = Command.new(address, KEYSET, key: device.scbk) | ||
| {device, command} | ||
| end |
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Where I got hung up on this PR was trying to decide how much install mode Jeff should be responsible for. This is the basic logic implemented in this PR in pseudocode:
if Jeff.add_device was called with a non-nil SCBK:
Try to establish a secure channel with the given SCBK
If secure channel is successful:
Done
# Else if install mode is not allowed:
# I was planning to implement this case, but I removed it
# because of the same issue in the on failure case below
# (not having a way to signal that a device is not working
# properly)
Else:
Try to connect with the install mode SCBK
On success:
Issue a KEYSET command to set the SCBK on the device
Restart the secure channel with the new SCBK
On failure:
TODO -- what _should_ happen here? We don't currently
have a way to indicate that a device isn't working
as expected
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