Concurrent access results in PCSC Error

[wrl]

This is a bug occurring in https://github.com/indygreg/apple-platform-rs, a downstream binary which (optionally) uses the yubikey-rs crate. It's unclear to me whether this is an apple-codesign (downstream) bug, one in yubikey-rs, or even one in pcsc-rust.

I've copied and pasted the text from from indygreg/apple-platform-rs#49 below:

I am using rcodesign in a on-premises CI server, with the smartcard functionality backed by a Yubikey 5 token.

When two (or more) jobs attempt to sign executables simultaneously, at least one (sometimes all) of them will begin exiting unsuccessfully with the pcsc-rust error Error::ResetCard, which has the description "The smart card has been reset, so any shared state information is invalid".

It's unclear to me where this error is being raised (i.e. when first connecting to the token, or when the signing operation is attempted), but it seems like pcsc-rust resets the Card when dropped (https://github.com/bluetech/pcsc-rust/blob/master/pcsc/src/lib.rs#L1670-L1684) and yubikey-rs doesn't change this or attempt to reconnect to the card on reset, though it does specify that the card should reset on reconnect (https://github.com/iqlusioninc/yubikey.rs/blob/main/src/yubikey.rs#L220-L224) and it seems like the card should perhaps reconnect if there's an error when starting a transaction (https://github.com/iqlusioninc/yubikey.rs/blob/main/src/yubikey.rs#L241-L245).

I am unfamiliar with PCSC and smartcards as a whole, so I'm not sure what the best practices for all of this are.

[tarcieri]

Dup of #424