CI/CD Hardening Checklist

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1. Workspace Trust & Input Safety (Highest Priority)

  • Never auto‑trust workspaces in CI

    • Require explicit trust configuration for any repo contents before loading configs or env files.
    • Mandatory for AI agents running in headless mode (e.g., Gemini CLI).

  • Treat forks, PRs, issues, and comments as untrusted

    • Especially dangerous when pipelines run on pull_request_target.
    • Never load .env, .gemini/, or agent config from untrusted inputs.

  • Block configuration discovery

    • Disable recursive discovery of agent configs unless explicitly allow‑listed.

2. AI Agent–Specific Controls (Gemini CLI, Claude Code, etc.)

  • Upgrade all agent tools

    • Gemini CLI ≥ 0.39.1
    • run-gemini-cli Action ≥ 0.1.22

  • Disable unrestricted execution modes

    • Avoid --yolo or equivalent autonomous modes.
    • If required, enforce strict command allowlists.

  • Separate “analysis” from “execution”

    • Let agents review or suggest changes.
    • Require a human gate or isolated job for command execution.

  • No agent runs with contributor‑level privileges

    • AI agents should never hold the same rights as a trusted developer.

3. Tool Allowlisting & Command Execution

  • Explicit command allowlists

    • Allow only exact binaries + arguments.
    • No wildcards (*, shell expansion, pipes).

  • Disable shell by default

    • Prefer structured tools over run_shell_command.

  • Fail closed

    • Any unknown or malformed command should hard‑fail the job.

4. Secrets & Credential Protection

  • Do not expose secrets to untrusted workflows

    • Especially on fork PRs and external contributions.

  • Use short‑lived, scoped credentials

    • Replace static tokens with OIDC or ephemeral secrets.

  • Automatic secret revocation

    • Rotate credentials after any compromised run or failed trust check.

5. Execution Environment Isolation

  • Ephemeral CI runners

    • Destroy runners after each job.
    • No shared disk or persistent state.

  • Network egress restrictions

    • Default‑deny outbound access.
    • Block data exfiltration paths.

  • Filesystem sandboxing

    • Read‑only source directories.
    • Writable temp directories only.

6. Dependency & Action Supply‑Chain Security

  • Pin all GitHub Actions

    • Use SHA commits, not tags.

  • Enable Dependabot / Renovate

    • Monitor toolchain and agent dependencies for security advisories.

  • Review AI agent updates as breaking changes

    • Treat behavior changes (trust, sandboxing) as security‑impacting.

7. Pipeline Logic & Permissions

  • Principle of least privilege

    • Separate jobs for:
      • Lint / analysis
      • Build
      • Deployment
      • Agent activity

  • No deployment from untrusted branches

    • Require protected branches + manual approval.

  • Explicit environment protection rules

    • Require reviewers for prod‑level secrets.

8. Logging, Detection & Audit

  • Log every executed command

    • Include AI‑initiated commands.

  • Preserve artifacts for forensic review

    • Capture workspace snapshots for suspicious runs.

  • Alert on abnormal behavior

    • Unexpected network calls
    • Config discovery
    • Shell execution attempts

9. Incident Readiness

  • Pre‑define a CI incident playbook

    • Credential rotation
    • Runner teardown
    • Repository lock‑down

  • Assume compromise if RCE occurs

    • Treat CI runners as fully breached.

10. Governance & Policy

  • Document agent trust policy

    • When agents may execute
    • What inputs are considered safe

  • Train developers

    • AI agents are code execution systems, not just chat assistants.

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