Mathieu Virbel
da3a2ac3a4
Rebrand the project from Fence to Greywall, the sandboxing layer of the GreyHaven platform. This updates: - Go module path to gitea.app.monadical.io/monadical/greywall - Binary name, CLI help text, and all usage examples - Config paths (~/.config/greywall/greywall.json), env vars (GREYWALL_*) - Log prefixes ([greywall:*]), temp file prefixes (greywall-*) - All documentation, scripts, CI workflows, and example files - README rewritten with GreyHaven branding and Fence attribution Directory/file renames: cmd/fence → cmd/greywall, pkg/fence → pkg/greywall, docs/why-fence.md → docs/why-greywall.md, example JSON files, and banner.
127 lines
3.5 KiB
Markdown
127 lines
3.5 KiB
Markdown
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# Greywall
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**The sandboxing layer of the GreyHaven platform.**
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Greywall wraps commands in a sandbox that blocks network access by default and restricts filesystem operations. It is the core sandboxing component of the GreyHaven platform, providing defense-in-depth for running untrusted code.
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```bash
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# Block all network access (default)
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greywall curl https://example.com # → 403 Forbidden
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# Allow specific domains
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greywall -t code npm install # → uses 'code' template with npm/pypi/etc allowed
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# Block dangerous commands
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greywall -c "rm -rf /" # → blocked by command deny rules
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```
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Greywall also works as a permission manager for CLI agents. **Greywall works with popular coding agents like Claude Code, Codex, Gemini CLI, Cursor Agent, OpenCode, Factory (Droid) CLI, etc.** See [agents.md](./docs/agents.md) for more details.
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## Install
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**macOS / Linux:**
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```bash
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curl -fsSL https://gitea.app.monadical.io/monadical/greywall/raw/branch/main/install.sh | sh
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```
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<details>
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<summary>Other installation methods</summary>
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**Go install:**
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```bash
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go install gitea.app.monadical.io/monadical/greywall/cmd/greywall@latest
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```
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**Build from source:**
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```bash
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git clone https://gitea.app.monadical.io/monadical/greywall
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cd greywall
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go build -o greywall ./cmd/greywall
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```
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</details>
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**Additional requirements for Linux:**
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- `bubblewrap` (for sandboxing)
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- `socat` (for network bridging)
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- `bpftrace` (optional, for filesystem violation visibility when monitoring with `-m`)
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## Usage
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### Basic
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```bash
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# Run command with all network blocked (no domains allowed by default)
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greywall curl https://example.com
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# Run with shell expansion
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greywall -c "echo hello && ls"
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# Enable debug logging
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greywall -d curl https://example.com
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# Use a template
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greywall -t code -- claude # Runs Claude Code using `code` template config
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# Monitor mode (shows violations)
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greywall -m npm install
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# Show all commands and options
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greywall --help
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```
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### Configuration
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Greywall reads from `~/.config/greywall/greywall.json` by default (or `~/Library/Application Support/greywall/greywall.json` on macOS).
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```json
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{
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"extends": "code",
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"network": { "allowedDomains": ["private.company.com"] },
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"filesystem": { "allowWrite": ["."] },
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"command": { "deny": ["git push", "npm publish"] }
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}
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```
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Use `greywall --settings ./custom.json` to specify a different config.
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### Import from Claude Code
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```bash
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greywall import --claude --save
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```
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## Features
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- **Network isolation** - All outbound blocked by default; allowlist domains via config
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- **Filesystem restrictions** - Control read/write access paths
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- **Command blocking** - Deny dangerous commands like `rm -rf /`, `git push`
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- **SSH Command Filtering** - Control which hosts and commands are allowed over SSH
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- **Built-in templates** - Pre-configured rulesets for common workflows
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- **Violation monitoring** - Real-time logging of blocked requests (`-m`)
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- **Cross-platform** - macOS (sandbox-exec) + Linux (bubblewrap)
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Greywall can be used as a Go package or CLI tool.
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## Documentation
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- [Index](/docs/README.md)
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- [Quickstart Guide](docs/quickstart.md)
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- [Configuration Reference](docs/configuration.md)
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- [Security Model](docs/security-model.md)
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- [Architecture](ARCHITECTURE.md)
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- [Library Usage (Go)](docs/library.md)
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- [Examples](examples/)
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## Attribution
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Greywall is based on [Fence](https://github.com/Use-Tusk/fence) by Use-Tusk.
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Inspired by Anthropic's [sandbox-runtime](https://github.com/anthropic-experimental/sandbox-runtime).
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