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Add a field for the CSR signature to the MBM data. #218

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Jan 8, 2025
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Add a field for the CSR signature to the MBM data. #218

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3e3586c
Add a field for the CSR signature to the MBM data.
avanpo Jan 7, 2025
98e3211
Update the MBM attestation workflow documentation.
avanpo Jan 8, 2025
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22 changes: 13 additions & 9 deletions certz/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -199,15 +199,19 @@ Call `Certz.GetIntegrityManifest`. The `Certz.GetIntegrityManifestResponse`'s
PCRs to be included and all allowable digest values.

Send a `Certz.GenerateCSRRequest` to the `Certz.Rotate` endpoint, containing a
`Certz.ReferenceIntegritySpec`. Using the returned `Certz.GenerateCSRResponse`,
do the following. Verify the EK certificate chain, and verify the
AK by nonce and certification by EK. Validate PCR digest as signed by the
validated AK. Verify the digest matches with one of the allowed ones. Lastly,
validate the CSR by its AK signature, and then process and extract the public
key.

Get a new certificate issued by a trusted CA using the public key. Then
`Certz.Rotate` as normal.
`Certz.ReferenceIntegritySpec`. Using the returned `Certz.GenerateCSRResponse`
and the `MBMData` within, do the following:

* Verify the `ek_leaf_cert` using the `ek_cert_chain` and your trust anchor.
* Validate the `ak_signature` over the `ak_attestation` struct which was
certified by the EK, and validate its contents. This verifies the AK.
* Validate the `signature` over `quoted` by the AK. Then validate that the PCRs
match one of the allowed ones.
* Validate the `csr_signature` over the `certificate_signing_request` by the AK.
This verifies the CSR.

Get a new certificate issued by a trusted CA using the CSR. Then `Certz.Rotate`
as normal.

### Open Questions/Considerations

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