Use Trustee-specific TCB Claims Extension #664
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Previously we were using the veraison annotated evidence extension to store the TCB Claims. This was a simplification, but it was not optimal. Thanks to some changes in the EAR crate, we can now easily store those claims in our own extension. Signed-off-by: Tobin Feldman-Fitzthum <[email protected]>
Now that we're using our own extension for TCB claims, the public key path is different. We could continue to support the old path as well, but I don't expect there to be any overlap. Signed-off-by: Tobin Feldman-Fitzthum <[email protected]>
We query the TCB claims to see which platform the evidence came from. Now that the TCB claims are in a new place, the policy will need to be adjusted slightly. This is a bit inconvenient but it shows why it's important to use the right extension in the first place. It's potentially very confusing to see veraison stuff in our policy. Signed-off-by: Tobin Feldman-Fitzthum <[email protected]>
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As a simplification, we are currently storing the tcb claims in the annotated evidence field of the EAR Appraisal. This field is actually an extension defined by veraison, so we end up with a token that had a veraison field in it even though we don't really follow the veraison protocol/spec.
Fortunately some recent changes to the EAR crate allow us to stick the tcb claims into our own extension. That's what this PR does. See commit messages for details.
This is going to be marked as a draft until the EAR crate has a release.