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53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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/*
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--------- WARNING! ---------
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THIS PACKAGE DOES CURRENTLY NOT IMPLEMENT ANY SNP ATTESTATION.
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It exists to implement required interfaces while implementing other parts of the AWS SNP attestation variant within Constellation.
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----------------------------
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# SNP
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Attestation based on TPMs and AMD SEV-SNP.
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The TPM is used to generate runtime measurements and sign them with an attestation key.
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The TPM currently runs outside the confidential context. This is a limitation imposed by the AWS implementation.
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# Issuer
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Generates a TPM attestation using an attestation key saved inside the TPM.
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Additionally loads the SEV-SNP attestation report and AMD VLEK certificate chain, and adds them to the attestation document.
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The SNP report includes a measurement of the initial firmware inside the CVM, which can be precalculated independently for verification.
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The report also includes the attestation key.
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# Validator
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Verifies the SNP report by verifying the VLEK certificate chain and the report's signature.
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This estabilishes trust in the attestation key and the CVM's initial firmware.
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However, since the TPM is outside the confidential context, it has to be trusted without verification.
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Thus, the hypervisor is still included in the trusted computing base.
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# Glossary
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This section explains abbreviations used in SNP implementation.
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- Attestation Key (AK)
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- AMD Root Key (ARK)
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- AMD Signing Key (ASK)
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- Versioned Chip Endorsement Key (VCEK)
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- Versioned Loaded Endorsement Key (VLEK)
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For more information see [SNP WhitePaper]
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[SNP WhitePaper]: https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf
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*/
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package snp
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