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Let's document this for now. We should be able to lift these limitations
sooner or later, at which point we can drop this documentation again.
These two limitations are a pitfall that people should be aware of,
before going FIDO2-only.
See: #20230#19208
This is an effort to compile a somewhat complete list how PCRs are
actually used on Linux systems these days. It contains data from: the
UEFI PC spec, the shim, the IMA, grub documentation.
I validated these PCRs to some level in the sources.
The grub specific stuff I only added in comments, since I was too lazy
too validate it (also, meh, grub).
It also gives people a hint on which PCR to bind to (and maybe kind of
an explanation of our default choice).
Previously, we supported only "," as separator. This adds support for
"+" and makes it the documented choice.
This is to make specifying PCRs in crypttab easier, since commas are
already used there for separating volume options, and needless escaping
sucks.
"," continues to be supported, but in order to keep things minimal not
documented.
Fixe: #19205
Some tokens support authorization via fingerprint or other biometric
ID. Add support for "user verification" to cryptenroll and cryptsetup.
Disable by default, as it is still quite uncommon.
In some cases user presence might not be required to get _a_
secret out of a FIDO2 device, but it might be required to
the get actual secret that was used to lock the volume.
Record whether we used it in the LUKS header JSON metadata.
Let the cryptenroll user ask for the feature, but bail out if it is
required by the token and the user disabled it.
Enabled by default.
Closes: https://github.com/systemd/systemd/issues/19246
Some FIDO2 devices allow the user to choose whether to use a PIN or not
and will HMAC with a different secret depending on the choice.
Some other devices (or some device-specific configuration) can instead
make it mandatory.
Allow the cryptenroll user to choose whether to use a PIN or not, but
fail immediately if it is a hard requirement.
Record the choice in the JSON-encoded LUKS header metadata so that the
right set of options can be used on unlock.
