Enable Checksum Verification

About Checksum Verification, please see also.

• Reference
• Configuration
• Registry Configuration
• Usage > aqua update-checksum

Create a GitHub Repository

Let's create a GitHub Repository for this tutorial. You can remove the repository after this tutorial.

Prepare GitHub Access Token

Please create a classic personal access token and add it to Repository Secrets.

• name: GH_TOKEN
• required permissions: contents: write

caution

GitHub Actions' token GITHUB_TOKEN is unavailable.

info

Unfortunately, fine-grained personal access token is unavailable at the moment because it doesn't support GraphQL API. https://github.com/cli/cli/issues/6680

2023-04-27 fine-grained access token supports GraphQL API now.

info

In this time we use a classic personal access token, but we recommend GitHub App or fine-grained access token in terms of security.

Create aqua.yaml

aqua init
aqua g -i suzuki-shunsuke/tfcmt

Enable Checksum Verification

By default, checksum verification is disabled. Let's edit aqua.yaml and enable Checksum Verification.

---
checksum:
  enabled: true
registries:
- type: standard
  ref: v4.155.1 # renovate: depName=aquaproj/aqua-registry
packages:
- name: suzuki-shunsuke/tfcmt@v4.2.0

Set up GitHub Actions Workflow

caution

For CircleCI Users, please use circleci-orb-aqua's update-checksum command instead.

To create and update aqua-checksum.json automatically, let's set up GitHub Actions.

mkdir -p .github/workflows
vi .github/workflows/update-aqua-checksum.yaml

name: update-aqua-checksum
on:
  pull_request:
    paths:
      - aqua.yaml
      - aqua-checksums.json
jobs:
  update-aqua-checksums:
    uses: aquaproj/update-checksum-workflow/.github/workflows/update-checksum.yaml@f367004e7f17e99d30297cd9e89afad30ee1f251 # v1.0.0
    permissions:
      contents: read
    with:
      aqua_version: v2.25.1
      prune: true
    secrets:
      gh_token: ${{secrets.GH_TOKEN}}
      # gh_app_id: ${{secrets.APP_ID}}
      # gh_app_private_key: ${{secrets.APP_PRIVATE_KEY}}

We use update-checksum-action. This action depends on int128/ghcp, so let's install it by aqua.

aqua g -i int128/ghcp

Create a pull request

Commit aqua.yaml and .github/workflows/update-aqua-checksum.yaml.

git checkout -b ci/aqua-checksum
git add aqua.yaml .github/workflows/update-aqua-checksum.yaml
git commit -m "ci: add aqua.yaml and set up workflow"
git push origin ci/aqua-checksum

Create a pull request. Then aqua-checksums.json will be created by GitHub Actions.

Change a package version

Let's change version.

sed -i "s/v4.2.0/v4.1.0/" aqua.yaml

-- name: suzuki-shunsuke/tfcmt@v4.2.0
+- name: suzuki-shunsuke/tfcmt@v4.1.0

Push a commit.

git pull origin ci/aqua-checksum
git add aqua.yaml
git commit -m "chore: change tfcmt version"
git push origin "ci/aqua-checksum"

Then aqua-checksums.json is updated automatically.

See how Checksum Verification prevents tampering

Let's see how Checksum Verification prevents tampering. It's bothersome to tamper assets actually, so in this time let's simulate the situation by tampering checksum in aqua-checksums.json.

git pull origin ci/aqua-checksum
vi aqua-checksums.json

     {
       "id": "github_release/github.com/suzuki-shunsuke/tfcmt/v4.1.0/tfcmt_linux_amd64.tar.gz",
-      "checksum": "A8E55BEA1A5F94F9515FD9C5C3296D1874461BA1DBD158B3FC0ED6A0DB3B7D91",
+      "checksum": "A8E55BEA1A5F94F9515FD9C5C3296D1874461BA1DBD158B3FC0ED6A0DB3B7D92",
       "algorithm": "sha256"
     },

Add a GitHub Actions job that runs a tampered package.

  test:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    env:
      AQUA_LOG_COLOR: always
      AQUA_REQUIRE_CHECKSUM: "true"
    steps:
      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
      - uses: aquaproj/aqua-installer@4551ec64e21bf0f557c2525135ff0bd2cba40ec7 # v3.0.0
        with:
          aqua_version: v2.25.1
        env:
          GITHUB_TOKEN: ${{github.token}}
      - run: tfcmt -v

git add aqua-checksums.json
git commit -m "chore: tamper aqua-checksums.json"
git push origin "ci/aqua-checksum"

Then test job would fail because the checksum is unmatched.

time="2023-03-12T06:36:05Z" level=fatal msg="aqua failed" actual_checksum=A8E55BEA1A5F94F9515FD9C5C3296D1874461BA1DBD158B3FC0ED6A0DB3B7D91 aqua_version=2.25.1 env=linux/amd64 error="checksum is invalid" exe_name=tfcmt expected_checksum=A8E55BEA1A5F94F9515FD9C5C3296D1874461BA1DBD158B3FC0ED6A0DB3B7D92 package=suzuki-shunsuke/tfcmt package_version=v4.1.0 program=aqua