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September 10, 2025 11:32
the new FIDO2 platform is not meant to be used standalone but only as an additional factor on top of existing platforms that support it.
platforms that implement the FIDO2ProviderInterface will need to implement the GetSymmetricKey function which will be used by the FIDO2 platform in order to retrieve a symmetric key. This symmetric key will then be used in conjuction with a FIDO2 authenticator to derive the final symmetric key which will be used for unlocking the disk unlocking key. Platform agnostic API's Keydata was extended with a new function RecoverFIDO2Salt() which will call the handler's GetSymmetricKey if the KeyData indicates that its handler is a platform which requires FIDO2.
the tpm2-fido2 platform extends the existing plain tpm2 platform to add support for FIDO2 authenticators. It is essentially implemented as a shim platform which first unseals the necessary key material from the TPM and then passes it on to the FIDO2 platform in order to get the final key material required for unlocking the disk unlocking key.
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Opening it as a draft to get comments on the overall architecture.
Things that are still being worked on:
Jira: https://warthogs.atlassian.net/browse/FR-11176