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Add subprocess isolation setup and git credential helper (#1132)

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- Add optional bubblewrap setup step for Linux subprocess isolation
  when allowed_non_write_users is configured
- Use git credential helper instead of embedding token in remote URL
- edit-issue-labels.sh: read issue number from workflow event payload
  instead of CLI arg
- Add CLAUDE_CODE_SCRIPT_CAPS env for per-script call limit config
- docs/security.md: note recommended github_token configuration

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Octavian Guzu
2026-03-31 12:36:51 +01:00
committed by GitHub
parent 7225f045c6
commit 32156b120b
7 changed files with 68 additions and 23 deletions
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docs/security.md
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@@ -13,7 +13,9 @@
- Accepts either a comma-separated list of specific usernames or `*` to allow all users
- **Should be used with extreme caution** as it bypasses the primary security mechanism of this action
- Is designed for automation workflows where user permissions are already restricted by the workflow's permission scope
- When set, Claude does a best-effort scrub of Anthropic, cloud, and GitHub Actions secrets from subprocess environments. This reduces but does not eliminate prompt injection risk — keep workflow permissions minimal and validate all outputs. Set `CLAUDE_CODE_SUBPROCESS_ENV_SCRUB: 0` in your workflow or job `env:` block to opt out.
- When set, Claude does a best-effort scrub of Anthropic, cloud, and GitHub Actions secrets from subprocess environments. On Linux runners with bubblewrap available, subprocesses additionally run with PID-namespace isolation. This reduces but does not eliminate prompt injection risk — keep workflow permissions minimal and validate all outputs. Set `CLAUDE_CODE_SUBPROCESS_ENV_SCRUB: 0` in your workflow or job `env:` block to opt out.
- Optionally set `CLAUDE_CODE_SCRIPT_CAPS` in your workflow `env:` block to limit how many times Claude can call specific scripts per run. Value is JSON: `{"script-name.sh": maxCalls}`. Example: `CLAUDE_CODE_SCRIPT_CAPS: '{"edit-issue-labels.sh":2}'` allows at most 2 calls to `edit-issue-labels.sh`. Useful for write-capable helper scripts.
- When using `allowed_non_write_users`, always pass `github_token: ${{ secrets.GITHUB_TOKEN }}`. The auto-generated workflow token is scoped to the job's declared permissions and expires automatically, which limits blast radius. Personal access tokens are not recommended for untrusted-input workflows.
- **Token Permissions**: The GitHub app receives only a short-lived token scoped specifically to the repository it's operating in
- **No Cross-Repository Access**: Each action invocation is limited to the repository where it was triggered
- **Limited Scope**: The token cannot access other repositories or perform actions beyond the configured permissions