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Support Cosign Image signature verification with KMS #360

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@Xynnn007 Xynnn007 commented Sep 17, 2023

This PR mainly add the support to verify image signature with public keys provided by KMS.

  • Add PublicKeyProvider API for KMS crate
  • Add get_public_key api for CDH
  • image-rs can get cosign verification public key from CDH when both cosign and confidential-data-hub feature are enabled

@@ -93,6 +93,9 @@ encryption = ["ocicrypt-rs/block-cipher"]
encryption-ring = ["ocicrypt-rs/block-cipher-ring", "encryption"]
encryption-openssl = ["ocicrypt-rs/block-cipher-openssl", "encryption"]

# Get needed image verification keys from Confidential Data Hub
confidential-data-hub = ["dep:ttrpc", "dep:protobuf"]
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@Xynnn007 Xynnn007 Nov 16, 2023

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Let me add tests for this feature in later PRs.

@Xynnn007 Xynnn007 force-pushed the feat-cdh-kms-pubkey branch from 153e96a to 4415e7a Compare December 6, 2023 08:40
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Aside from my limited familiarity with cosign, the other parts generally seem quite good.

confidential-data-hub/kms/src/plugins/mod.rs Show resolved Hide resolved
@Xynnn007 Xynnn007 force-pushed the feat-cdh-kms-pubkey branch 2 times, most recently from 6bf1766 to 2faab59 Compare December 15, 2023 03:01
Confidential Data Hub now supports to get public key from the different
KMS services. The public keys are for signature verification. As
currently not all non-attestation functionalities of AA are moved to
CDH.

So `confidential-data-hub` is a workaround feature to make the code
compilable without breaking current logic.

After confidential-containers#412 is resolved, we should abandon the `confidential-data-hub`
feature.

Signed-off-by: Xynnn007 <[email protected]>
@Xynnn007 Xynnn007 force-pushed the feat-cdh-kms-pubkey branch from 2faab59 to d041954 Compare December 15, 2023 06:55
@Xynnn007 Xynnn007 marked this pull request as draft January 2, 2024 01:40
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Xynnn007 commented Jan 2, 2024

After discussions with @arronwy , let's temporarily make this draft. As the KMS configurations are still not easy to use, we will keep on doing this PR after #413

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