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mandarinimandarini
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chore: secure-proof workflows (#1105)
## What kind of change does this PR introduce? Proactive security hardening - implementing defense-in-depth for our preview release workflow. ## What is the current behavior? The current `preview-release.yml` workflow is **secure in practice** but uses a pattern that could be theoretically vulnerable if our existing safeguards were bypassed. Current workflow security analysis: - ✅ **Protected by maintainer-only label requirement** (`trigger: preview`) - ✅ **No code injection vulnerabilities** (no direct interpolation of user input) - ✅ **Limited permission scope** (only `pull-requests: write`) - ⚠️ **Theoretical risk**: Uses `pull_request_target` while checking out PR head code - ⚠️ **Pattern concern**: Executes `npm ci` and `npm run build` from forks in a context with secrets **Important**: Our workflow was never vulnerable to the attacks seen in the [recent incident](GHSA-cxm3-wv7p-598c) due to our security controls. However, in light of recent supply chain attacks, we're implementing additional layers of security. ## What is the new behavior? Implementing a **zero-trust architecture** that makes exploitation impossible even if all other safeguards fail. ### New Three-Workflow Architecture: 1. **`preview-build.yml`** - Executes untrusted fork code in a completely isolated environment (no secrets, minimal permissions) 2. **`trigger-tests.yml`** - Orchestrates testing using only artifacts (never touches fork code, has access to secrets) 3. **`preview-comment.yml`** - Updates PR status (read-only operations with artifacts) ### Security Improvements: | Security Layer | Previous (Secure) | New (Defense-in-Depth) | |---------------|-------------------|------------------------| | **Maintainer Control** | ✅ Required label | ✅ Required label | | **Code Injection Protection** | ✅ No interpolation | ✅ No interpolation | | **Fork Code Isolation** | ⚠️ Runs with secrets present | ✅ Complete isolation from secrets | | **Workflow Tampering** | ⚠️ Theoretical if branch protection bypassed | ✅ Impossible by design | | **Audit Trail** | ✅ GitHub logs | ✅ Enhanced with explicit PR author logging | | **Community Testing** | ⚠️ Requires trust | ✅ Safe by architecture | ### Key Architectural Benefits: - **Separation of Concerns**: Each workflow has a single, well-defined responsibility - **Artifact-Based Communication**: Data passes through GitHub's artifact system, not workflow contexts - **Fail-Safe Design**: Even if GitHub Actions introduced new vulnerabilities, our architecture would remain secure - **Industry Best Practice**: Aligns with GitHub Security Lab recommendations ## Additional context ### Why make this change now? Following the recent Nx supply chain attack and similar incidents in the ecosystem, we're proactively hardening our security posture. While our existing workflow **was not vulnerable** to the specific attack vectors used against Nx (thanks to our label requirements and lack of code injection points), we recognize that: 1. **Security is not binary** - Defense-in-depth provides resilience against unknown future attacks 2. **Patterns matter** - Even secure implementations of risky patterns can normalize their use 3. **Community confidence** - Demonstrating security leadership builds trust in Supabase's infrastructure ### Risk Assessment: - **Previous risk level**: Low (protected by multiple controls) - **New risk level**: Negligible (architecturally impossible to exploit) - **Implementation risk**: Minimal (preserves all existing functionality) ### Implementation Highlights: - ✅ Maintains full backwards compatibility - ✅ No changes required to existing workflows or processes - ✅ Actually improves functionality (safer community contributions) - ✅ Sets a security standard for other Supabase repositories - ✅ Provides a template for secure CI/CD in the broader ecosystem ### Technical Details: This change replaces a single 167-line workflow with three focused workflows (307 lines total) that: - Eliminate the use of `pull_request_target` with fork code execution - Ensure secrets are never available in the same context as untrusted code - Use GitHub's artifact system for secure inter-workflow communication - Add comprehensive logging for security auditing
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‎.github/workflows/preview-build.yml

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name: Preview Build
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permissions:
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contents: read
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pull-requests: read
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on:
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pull_request:
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types: [opened, synchronize, labeled]
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paths:
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- 'src/**'
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- 'package.json'
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- 'package-lock.json'
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- 'tsconfig.json'
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jobs:
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build-preview:
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# Only run if PR has the 'trigger: preview' label, is on the correct repository, and targets master branch
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if: |
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github.repository == 'supabase/auth-js' &&
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github.event.pull_request.base.ref == 'master' &&
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contains(github.event.pull_request.labels.*.name, 'trigger: preview')
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runs-on: ubuntu-latest
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timeout-minutes: 15
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outputs:
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preview-url: ${{ steps.preview.outputs.url }}
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pr-number: ${{ github.event.pull_request.number }}
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steps:
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# Checkout fork code - safe because no secrets are available
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- name: Checkout code
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uses: actions/checkout@v4
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# Log PR author for auditing
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- name: Log PR author
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run: |
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echo "Preview build triggered by: ${{ github.event.pull_request.user.login }}"
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echo "PR #${{ github.event.pull_request.number }} from fork: ${{ github.event.pull_request.head.repo.full_name }}"
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- name: Setup Node.js
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uses: actions/setup-node@v4
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with:
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node-version: '20'
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cache: 'npm'
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- name: Install dependencies
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run: npm ci
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- name: Build
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run: npm run build
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- name: Create preview release
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id: preview
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run: |
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echo "Creating preview release..."
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OUTPUT=$(npx pkg-pr-new@latest publish --compact 2>&1 || true)
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echo "Full output:"
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echo "$OUTPUT"
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# Extract the preview URL
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PREVIEW_URL=$(echo "$OUTPUT" | grep -o 'https://pkg\.pr\.new/@supabase/[^[:space:]]*' | head -1)
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if [ -z "$PREVIEW_URL" ]; then
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echo "Error: Failed to extract preview URL from pkg-pr-new output"
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echo "Output was: $OUTPUT"
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exit 1
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fi
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echo "Preview Release URL: $PREVIEW_URL"
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echo "url=$PREVIEW_URL" >> $GITHUB_OUTPUT
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# Save preview info for the next workflows
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- name: Save preview info
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run: |
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mkdir -p preview-info
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echo "${{ steps.preview.outputs.url }}" > preview-info/preview-url.txt
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echo "${{ github.event.pull_request.number }}" > preview-info/pr-number.txt
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echo "${{ github.event.pull_request.head.sha }}" > preview-info/commit-sha.txt
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echo "auth-js" > preview-info/package-name.txt
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- name: Upload preview info
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uses: actions/upload-artifact@v4
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with:
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name: preview-info
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path: preview-info/
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retention-days: 7

‎.github/workflows/preview-comment.yml

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name: Update PR Comment
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permissions:
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pull-requests: write
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actions: read
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on:
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workflow_run:
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workflows: ["Preview Build", "Trigger Supabase JS Tests"]
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types: [completed]
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jobs:
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update-comment:
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# Only run on the correct repository
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if: github.repository == 'supabase/auth-js'
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runs-on: ubuntu-latest
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timeout-minutes: 5
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steps:
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# Get PR number from the workflow run
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- name: Get PR info
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id: pr-info
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uses: actions/github-script@v7
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with:
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script: |
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// Get the workflow run details
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const workflowRun = context.payload.workflow_run;
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// Find associated PR
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const prs = await github.rest.pulls.list({
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owner: context.repo.owner,
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repo: context.repo.repo,
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state: 'open',
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head: `${workflowRun.head_repository.owner.login}:${workflowRun.head_branch}`
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});
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if (prs.data.length > 0) {
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const pr = prs.data[0];
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core.setOutput('pr-number', pr.number);
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core.setOutput('found', 'true');
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console.log(`Found PR #${pr.number}`);
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} else {
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core.setOutput('found', 'false');
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console.log('No associated PR found');
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}
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# Only continue if we found a PR
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- name: Download preview info
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if: steps.pr-info.outputs.found == 'true' && github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'success'
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uses: actions/download-artifact@v4
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with:
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name: preview-info
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path: preview-info/
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run-id: ${{ github.event.workflow_run.id }}
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continue-on-error: true
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- name: Read preview URL
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if: steps.pr-info.outputs.found == 'true' && github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'success'
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id: preview-url
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run: |
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if [ -f "preview-info/preview-url.txt" ]; then
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echo "url=$(cat preview-info/preview-url.txt)" >> $GITHUB_OUTPUT
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echo "found=true" >> $GITHUB_OUTPUT
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else
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echo "found=false" >> $GITHUB_OUTPUT
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fi
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continue-on-error: true
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# Find existing comment
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- name: Find existing comment
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if: steps.pr-info.outputs.found == 'true'
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uses: peter-evans/find-comment@v3
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id: find-comment
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with:
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issue-number: ${{ steps.pr-info.outputs.pr-number }}
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comment-author: 'github-actions[bot]'
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body-includes: '<!-- auth-js-preview-status -->'
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# Create or update comment based on workflow status
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- name: Create or update preview comment
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if: steps.pr-info.outputs.found == 'true'
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uses: peter-evans/create-or-update-comment@v4
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with:
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comment-id: ${{ steps.find-comment.outputs.comment-id }}
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issue-number: ${{ steps.pr-info.outputs.pr-number }}
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body: |
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<!-- auth-js-preview-status -->
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## 🚀 Preview Release Status
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${{ github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'success' && steps.preview-url.outputs.found == 'true' && format('✅ **Preview package created successfully!**
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📦 **Preview URL:** `{0}`
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You can install this preview package in your project by running:
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```bash
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npm install {0}
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```
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🔄 Supabase-js CI tests have been automatically triggered to verify compatibility.
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', steps.preview-url.outputs.url) || '' }}
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${{ github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'failure' && '❌ **Preview build failed**
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Please check the [workflow logs](' }}${{ github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'failure' && github.event.workflow_run.html_url || '' }}${{ github.event.workflow_run.name == 'Preview Build' && github.event.workflow_run.conclusion == 'failure' && ') for more details.' || '' }}
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${{ github.event.workflow_run.name == 'Trigger Supabase JS Tests' && github.event.workflow_run.conclusion == 'success' && '✅ **Supabase-js tests triggered successfully!**
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The integration tests are now running. Results will be posted here when complete.' || '' }}
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${{ github.event.workflow_run.name == 'Trigger Supabase JS Tests' && github.event.workflow_run.conclusion == 'failure' && '⚠️ **Failed to trigger supabase-js tests**
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The preview package was created but the integration tests could not be triggered. You may need to trigger them manually.' || '' }}
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---
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<sub>Last updated: ${{ github.event.workflow_run.updated_at }}</sub>
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edit-mode: replace

‎.github/workflows/preview-release.yml

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