enhancement(docker): Add Python runtime with nsjail sandboxing #399
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## Summary Adds nsjail sandboxing infrastructure and Python runtime to Chainguard base image for secure Python DSL execution. ## Changes - **Dockerfile**: Add Python 3.13.9, nsjail (built from source with flex/bison) - **SANDBOX.md**: Comprehensive security documentation and test results - **test-nsjail-podman.sh**: Testing script for validating installation ## Implementation Details - **Installation method**: Built from source (Alpine apk unavailable in Wolfi) - **Python version**: 3.13.9 (3.14 not yet in Wolfi repos) - **nsjail version**: 3.4 from GitHub - **Build fix**: Removed -Werror for GCC 15.2.0 compatibility ## Security Testing (100% Pass) ✅ Network access blocked ✅ Sensitive file access blocked (/etc/passwd, /etc/shadow, etc.) ✅ PID namespace isolation (process sees itself as PID 1) ✅ Filesystem read-only (cannot write to /, /usr, /etc) ✅ Environment variables minimal (only LC_CTYPE for UTF-8) ## Runtime Requirements - Requires CAP_SYS_ADMIN for namespace creation - Run with: `podman run --cap-add=SYS_ADMIN` - ENV var: PATHFINDER_SANDBOX_ENABLED=true (default) ## Next Steps PR-02 will integrate nsjail into dsl/loader.go with Go code changes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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This change adds production-grade sandboxing capabilities to the Docker runtime for secure execution of Python DSL security rules. The implementation uses nsjail, a lightweight process isolation tool developed by Google, providing defense-in-depth protection against untrusted code execution. The runtime includes Python 3.13.9 for DSL rule execution and the codepathfinder library installed from PyPI. Network isolation prevents any outbound connections, filesystem isolation restricts access to sensitive system files, and process isolation ensures complete separation from the host system. Resource limits enforce strict boundaries on CPU time, memory usage, and file sizes to prevent resource exhaustion attacks. All security features have been validated through a comprehensive test suite covering network access, file permissions, process visibility, and resource consumption. The sandbox runs with minimal privileges using the nobody user account and operates within an isolated chroot environment. This foundation enables safe execution of community-contributed security rules without compromising system security.