Comments (6)
What mode is the Neo in when you try to read the serial?
For the 3.2 firmware if it's in composite otp+ccid and the ccid part is in use (or what's called acquired) serial reading will fail.
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We need both OTP and CCID, so both are enabled. But CCID isn't actively used - I'm not authenticating ssh at that time, or anything like that.
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so if you're using it with gnupg if scdaemon is running it holds on to the card, making it only switch to OTP by pressing the button and emitting an OTP.
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I do have gnupg enabled to use the smartcard on the NEO. gpg-agent is running all the time, but scdaemon is only running occasionally, as far as I can tell - only when gpg-daemon actually needs the card.
However, I've noticed something else:
$ ps -ef | grep -i scd
0 1714 15 0 12:53PM ?? 0:00.21 /usr/sbin/pcscd -f
After killing it, ykinfo -a started running again.
I've done a bit of googling, and disabling pcscd doesn't seem to be trivial. It looks like it's launched automatically when a smartcard is detected.
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Yes. this is in line with expectations, the CCID being active locks down the OTP interface to API requests of Neos before 3.3. OTP with button should still work though.
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Closing this since it's a Neo limitation, not a software error.
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