Fix legacy attestation report validation #293
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rouming
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It looks correct to me, did you have any issues @larrydewey
larrydewey
approved these changes
Mar 27, 2025
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Please let me know, if there is anything to address from my side. Also I would really appreciate, if you review the |
DGonzalezVillal
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Apr 2, 2025
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@rouming Could you squash into one commit, besides that it looks good, we can merge right after. |
tylerfanelli
approved these changes
Apr 2, 2025
This commit fixes legacy attestation report verification by addressing a few problems: 1. Fix typo of `launch_digest` definition for the `LegacyAttestationReport` structure: should be `DIGEST_SIZE` not `POLICY_SIZE`. 2. Signature verification should be performed on the SHA256 digest, not on the raw data. Additionally, the return value of `sig.verify()` should be properly converted to the `Result` type. 3. The `EcdsaSignature` structure has a size of 512 bytes, but the `LegacyAttestationReport` defines the signature as 144 bytes. Change the type of the signature to an `Array<u8, 144>` with an appropriate conversion trait. Signed-off-by: Roman Penyaev <[email protected]>
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@DGonzalezVillal @tylerfanelli squashed, please take a look. |
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Hi folks,
For a couple of weeks, I've been investigating AMD SEV technology and experimenting with the
sev/sevctltool. I noticed that legacy report validation was only drafted (rewritten from the deprecatedsev-tool) but actually does not work as expected. I've fixed that and tried to mimic the spirit of thesevctltool as much as possible. This is my first contribution in Rust, so your feedback is highly appreciated.What has been done in this PR:
LegacyAttestationReportby defining it as anArray<u8, 144>instead of anEcdsaSignaturestructure, which is 512 bytes.LegacyAttestationReport, ensuringlaunch_digestusesDIGEST_SIZEinstead ofPOLICY_SIZE.There should be another PR for
sevctlitself coming soon, I'll provide a link to that PR once I push it.Update: the
sevctlpart virtee/sevctl#205