docs: update state of clouds #1732
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derpsteb
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May 4, 2023
docs/docs/overview/clouds.md
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| AWS currently doesn't offer CVMs. AWS proprietary Nitro Enclaves offer some related features but [are explicitly not designed to keep AWS itself out](https://aws.amazon.com/blogs/security/confidential-computing-an-aws-perspective/). Besides, they aren't suitable for running entire Kubernetes nodes inside them. Therefore, Constellation uses regular EC2 instances on AWS [Nitro](https://aws.amazon.com/ec2/nitro/) without runtime encryption. Attestation is based on the [NitroTPM](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/nitrotpm.html), which is a vTPM managed by the Nitro hypervisor. Hence, the hypervisor is currently part of Constellation's TCB. | ||
| ## Amazon Web Services (AWS) | ||
| Amazon EC2 [supports AMD SEV-SNP](https://aws.amazon.com/de/about-aws/whats-new/2023/04/amazon-ec2-amd-sev-snp/). Regarding (3), AWS provides direct access to remote-attestation statements. However, regarding (4), the CVMs still include closed-source firmware running in VM Privilege Level (VMPL) 0. |
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re CVMs still include closed-source firmware: I did not check yet if we can independently recreate the measurement we get from the sev-guest device. But, AWS says the initial firmware inside the CVM is based on OVMF. So it may not be closed-source. On the other hand, there is no information yet what exactly is put into the CVM.
derpsteb
approved these changes
May 4, 2023
thomasten
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May 4, 2023
Co-authored-by: Thomas Tendyck <51411342+thomasten@users.noreply.github.com>
thomasten
approved these changes
May 9, 2023
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