AWS Nitro Enclaves EIF Build GitHub Action

This GitHub Action use kaniko and Amazon Linux container with nitro-cli to build a reproducible AWS Nitro Enclaves EIF file and its information.

Artifact upload and signing

This actions has an optional feature to upload the EIF file and its info the ghcr registry.

There is another optional feature to use SigStore and the Github actions token to sign the upload artifact.

To enable these feature, set the input enable-ghcr-push (For artifact upload) and enable-artifact-sign (For artifact signing) to true

Read this on downloading and verifying the signed artifact

Usage

Example

# The following permissions are required when "enable-ghcr-push" is true
permissions:
  packages: write
  id-token: write

steps:
  - name: Build EIF
    id: build-eif
    uses: richardfan1126/nitro-enclaves-eif-build-action@v1
    with:
      docker-build-context-path: app/
      dockerfile-path: Dockerfile
      enable-ghcr-push: true
      enable-artifact-sign: true
      eif-file-name: enclave.eif
      eif-info-file-name: enclave-info.json
      artifact-tag: latest
      save-pcrs-in-annotation: true
      github-token: ${{ secrets.GITHUB_TOKEN }}

See richardfan1126/nitro-enclaves-cosign-sandbox for sample use case.

Pre-requisites

This action only runs on x64 Linux runner.

If enable-ghcr-push is true, the following permission is required for the workflow:

• packages: write

• id-token: write

Inputs

• docker-build-context-path (Required)

  The path of the Docker build context. Usually, it is the directory containing your Dockerfile.

  This path is relative to your GitHub project root directory.

• dockerfile-path

  (Default: Dockerfile)

  The path of the Dockerfile used to build the EIF file.

  This path is relative to docker-build-context-path

• enable-ghcr-push

  (Default: false)

  Set to true to upload artifacts into ghcr.

• enable-artifact-sign

  (Default: false)

  Set to true to use SigStore to sign the uploaded artifact on ghcr.

  If this input is true, enable-ghcr-push must also set to true.

• eif-file-name

  The filename of the EIF file uploaded to ghcr

  This must be set if enable-ghcr-push is true.

• eif-info-file-name

  The filename of the EIF info text file uploaded to ghcr

  This must be set if enable-ghcr-push is true.

• artifact-tag

  The tag of the artifact uploaded to ghcr

  This must be set if enable-ghcr-push is true.

• save-pcrs-in-annotation

  (Default: false)

  Set to true to add PRC values of the EIF (PCR0, PCR1 and PCR2) as artifact annotation.

  Read ORAS documentation for more detail: https://oras.land/docs/how_to_guides/manifest_annotations

  If this input is true, enable-ghcr-push must also set to true.

• github-token

  (Default: ${{ github.token }})

  The token used to sign in to ghcr

Outputs

• eif-file-path

  The path of the built EIF file

• eif-info-path

  The path of the text file containing the EIF information

  Example of the file content:

  {
    "EifVersion": 4,
    "Measurements": {
      "HashAlgorithm": "Sha384 { ... }",
      "PCR0": "1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
      "PCR1": "1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
      "PCR2": "1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    },
    "IsSigned": false,
    "CheckCRC": true,
    "ImageName": "1111111111111",
    "ImageVersion": "1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    "Metadata": {
      "BuildTime": "2020-01-01T00:00:00.000000000+00:00",
      "BuildTool": "nitro-cli",
      "BuildToolVersion": "1.0.0",
      "OperatingSystem": "Linux",
      "KernelVersion": "4.0.0",
      "DockerInfo": {
        "Architecture": "amd64",
        "Author": "",
        "Comment": "",
        "Config": {
          "AttachStderr": false,
          "AttachStdin": false,
          "AttachStdout": false,
          "Cmd": [
            "/bin/sh",
            "-c",
            "/app"
          ],
          "Domainname": "",
          "Entrypoint": null,
          "Env": [
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
            "ARCH=x86_64"
          ],
          "ExposedPorts": null,
          "Hostname": "",
          "Image": "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
          "Labels": null,
          "OnBuild": null,
          "OpenStdin": false,
          "StdinOnce": false,
          "Tty": false,
          "User": "",
          "WorkingDir": "/app"
        },
        "Created": "0001-01-01T00:00:00Z",
        "DockerVersion": "",
        "Id": "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
        "Os": "linux",
        "Parent": "",
        "RepoDigests": [],
        "RepoTags": [
          "1111111111111:latest"
        ],
        "Size": 9999999,
        "VirtualSize": 9999999
      }
    }
  }

• ghcr-artifact-digest

  The digest of the pushed ghcr artifact.

  Only applicable when enable-ghcr-push is true.

• ghcr-artifact-path

  The full path of the pushed ghcr artifact.

  Only applicable when enable-ghcr-push is true.

• rekor-log-index

  The Rekor transparency log index of the signing.

  It can be used to find the signing log on Rekor Search

  Only applicable when enable-ghcr-push is true.

How to verify the artifact signature

In this Github Action, the artifact is uploaded to ghcr by ORAS and signed by SigStore cosign.

The uploaded artifact path is in the output ghcr-artifact-path, you can use the following command to pull it:

oras pull ghcr.io/username/repo:tag@sha256:<digest>

The artifact signing is recorded in Rekor transparency log.

With the Log index in output rekor-log-index, you can find the signing log on Rekor Search

To verify the uploaded artifact against the signature, you can use the following command:

Replace <username> with your Github username and <repo> with the Github repository name

cosign verify ghcr.io/username/repo:tag \
    --certificate-identity-regexp https://github.com/<username>/<repo>/ \
    --certificate-oidc-issuer https://token.actions.githubusercontent.com