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rfc: define image info v2

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The version v1 of the image/info.json file is not capable to encode multiple regions and
attestation variants for a given csp.
This is why a v2 is needed with a more extensible structure.
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Malte Poll 2023-05-05 11:27:35 +02:00 committed by Malte Poll
parent a1fddd312c
commit 45e67d9d22
1 changed files with 89 additions and 8 deletions
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rfc/image-api.md
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@ -72,8 +72,10 @@ Where applicable, the API uses the following CSP names:
The following HTTP endpoints are available:
- `GET /constellation/v2/ref/<REF>/stream/<STREAM>/<VERSION>/image/`
- [`info.json` returns the lookup table for the given image version.](#image-lookup-table-v2)
- `GET /constellation/v1/ref/<REF>/stream/<STREAM>/<VERSION>/image/`
- [`info.json` returns the lookup table for the given image version.](#image-lookup-table)
- [`info.json` returns the lookup table for the given image version.](#image-lookup-table-v1)
- `sbom.<format>.json` contains SBOM files for the given image version. The exact formats and file names are TBD.
- `GET /constellation/v1/ref/<REF>/stream/<STREAM>/<VERSION>/csp/<csp>/` contains files with measurements and signatures for the given image version and CSP.
- `measurements.json` contains the measurements for the given image version and CSP.
@ -81,8 +83,87 @@ The following HTTP endpoints are available:
- `image.raw` returns the raw image for the given image version and CSP.
## Image lookup table (v2)
## Image lookup table
The image lookup table is a JSON file that maps the image name consisting of `ref`, `stream` and `version` to the CSP-specific image references:
```
/constellation/v2/ref/<REF>/stream/<STREAM>/<VERSION>/image/info.json
```
```json
{
"version": "<VERSION>",
"ref": "<REF>",
"stream": "<STREAM>",
"list": [
{
"csp": "<CSP>",
"attestationVariant": "<ATTESTATION_VARIANT>",
"reference": "<CSP_SPECIFIC_IMAGE_REFERENCE>",
"region": "<CSP_REGION>"
},
{
"csp": "aws",
"attestationVariant": "aws-nitro-tpm",
"reference": "ami-123",
"region": "us-east-1"
},
{
"csp": "aws",
"attestationVariant": "aws-nitro-tpm",
"reference": "ami-456",
"region": "us-west-2"
},
{
"csp": "azure",
"attestationVariant": "azure-sev-snp",
"reference": "azure-cvm-123"
}
{
"csp": "azure",
"attestationVariant": "azure-trustedlaunch",
"reference": "azure-trusted-launch-123"
},
{
"csp": "gcp",
"attestationVariant": "gcp-sev-es",
"reference": "gcp-image-123",
},
{
"csp": "openstack",
"attestationVariant": "qemu-vtpm",
"reference": "https://cdn.confidential.cloud/constellation/v1/ref/<REF>/stream/<STREAM>/<VERSION>/image/csp/openstack/qemu-vtpm/image.raw"
},
{
"csp": "qemu",
"attestationVariant": "qemu-vtpm",
"reference": "https://cdn.confidential.cloud/constellation/v1/ref/<REF>/stream/<STREAM>/<VERSION>/image/csp/qemu/qemu-vtpm/image.raw"
}
]
}
```
Fields:
- `version`: The version of the image.
- `ref`: The reference of the image.
- `stream`: The stream of the image.
- `list`: An array of image references for each CSP.
- `csp`: The cloud service provider. Required.
- `attestationVariant`: The attestation variant of the image. Required.
- `reference`: The CSP-specific image reference. Required.
- `region`: The (optional) CSP-specific region of the image.
If required, the fields in the `.list` array can be extended in the future to include additional information while maintaining backwards compatibility.
This document is not signed and can be extended in the future to include more image references.
The same document can be used to identify old images that are no longer used and can be deleted for cost optimization.
## Image lookup table (v1)
The image lookup table is a JSON file that maps the image name consisting of `ref`, `stream` and `version` to the CSP-specific image references:
@ -136,12 +217,12 @@ The `image` field is independent of the CSP and is a used to discover the CSP-sp
The CLI can find a CSP- and region specific image reference by looking up the image name in the following order:
- if a local file `<IMAGE NAME>.json` exists, use the lookup table in that file
- otherwise, load the image lookup table from a well known URL (e.g. `https://cdn.confidential.cloud/constellation/v1/ref/<REF>/stream/<STREAM>/<VERSION>/image/info.json`) and use the lookup table in that file
- choose the CSP-specific image reference for the current region and security type:
- On AWS, use the AMI ID for the current region (e.g. `.aws.us-east-1`)
- On Azure, use the image ID for the security type (CVM or Trusted Launch) (e.g. `.azure.cvm`)
- On GCP, use the only image ID (e.g. `.gcp.sev-es`)
- On QEMU, use the only image ID (e.g. `.qemu.default`)
- otherwise, load the image lookup table from a well known URL (e.g. `https://cdn.confidential.cloud/constellation/v2/ref/<REF>/stream/<STREAM>/<VERSION>/image/info.json`) and use the lookup table in that file
- choose the CSP-specific image reference for the current region and attestation variant:
- On AWS, use the AMI ID for the current region (e.g. `us-east-1`) and attestation variant (e.g. `aws-nitro-tpm`)
- On Azure, use the image ID for the attestation variant (CVM or Trusted Launch) (e.g. `azure-sev-snp`)
- On GCP, use the image ID for the attestation variant (e.g. `gcp-sev-es`)
- On QEMU, use the image ID for the attestation variant (e.g. `qemu-vtpm`)
This allows customers to upload images to their own cloud subscription and use them with the CLI by providing the image lookup table as a local file.