6910c06981
Integration of official Anthropic sandboxing docs (5/5 CRITICAL): Created (5 files): - guide/sandbox-native.md (~3K words): Complete technical reference * OS primitives (Seatbelt/bubblewrap), filesystem/network isolation * Sandbox modes, escape hatch, security limitations * Decision trees, config examples, troubleshooting - docs/resource-evaluations/native-sandbox-official-docs.md (5/5 score) - examples/config/sandbox-native.json (production config) - examples/commands/sandbox-status.md (sandbox inspection) - examples/hooks/bash/sandbox-validation.sh (prod validation) Updated (5 files): - guide/sandbox-isolation.md: Section 4 "Native Claude Code Sandbox" * Comparison Native vs Docker (process-level vs microVM) * Updated TL;DR, comparison matrix, decision tree - guide/architecture.md: Native Sandbox sub-section in Security Model - machine-readable/reference.yaml: +24 sandbox entries - VERSION: 3.21.0 → 3.21.1 - README.md: Templates 100→103, Evaluations 44→45 - CHANGELOG.md: v3.21.1 entry Closes critical security documentation gap (~1800 words missing). Fact-checked 100%, agent-challenged (technical-writer), production-ready. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
123 lines
3.4 KiB
Bash
123 lines
3.4 KiB
Bash
#!/bin/bash
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#
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# Sandbox Validation Hook (PreToolUse)
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#
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# Purpose: Verify native sandbox is active before executing bash commands in production/untrusted environments
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# Event: PreToolUse
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# Blocking: Yes (exit 2 blocks command execution)
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#
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# Installation:
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# 1. Copy to .claude/hooks/PreToolUse_sandbox-validation.sh
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# 2. chmod +x .claude/hooks/PreToolUse_sandbox-validation.sh
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# 3. Configure in settings.json:
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# {
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# "hooks": {
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# "PreToolUse": [
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# {
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# "command": "bash",
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# "script": ".claude/hooks/PreToolUse_sandbox-validation.sh"
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# }
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# ]
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# }
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# }
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#
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# Environment Variables (passed by Claude Code):
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# CLAUDE_TOOL_NAME: Name of the tool being used (e.g., "Bash")
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# CLAUDE_TOOL_PARAMS: JSON string of tool parameters
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#
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# Exit Codes:
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# 0 = Allow (sandbox active or check disabled)
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# 2 = Block (sandbox not active in strict mode)
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set -euo pipefail
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# Configuration
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STRICT_MODE="${SANDBOX_VALIDATION_STRICT:-false}" # Set to "true" to require sandbox in production
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PRODUCTION_MARKER="${SANDBOX_VALIDATION_MARKER:-.production}" # File marker for production environments
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# Only validate Bash tool
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if [ "${CLAUDE_TOOL_NAME:-}" != "Bash" ]; then
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exit 0
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fi
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# Check if production environment
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is_production() {
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[ -f "$PRODUCTION_MARKER" ] || [ "${ENVIRONMENT:-}" = "production" ]
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}
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# Check if sandbox is active
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is_sandbox_active() {
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# Parse tool parameters to check for dangerouslyDisableSandbox
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if echo "${CLAUDE_TOOL_PARAMS:-}" | jq -e '.dangerouslyDisableSandbox == true' >/dev/null 2>&1; then
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return 1 # Sandbox explicitly disabled
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fi
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# Platform-specific checks
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case "$OSTYPE" in
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darwin*)
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# macOS: Check if Seatbelt is available
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if command -v sandbox-exec >/dev/null 2>&1; then
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return 0
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fi
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;;
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linux*)
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# Linux: Check if bubblewrap is available
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if command -v bubblewrap >/dev/null 2>&1; then
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return 0
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fi
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;;
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esac
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return 1 # Sandbox not available
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}
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# Main validation logic
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main() {
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# Skip validation if not in strict mode and not production
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if [ "$STRICT_MODE" != "true" ] && ! is_production; then
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exit 0
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fi
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# Check sandbox status
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if ! is_sandbox_active; then
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echo "❌ SANDBOX VALIDATION FAILED" >&2
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echo "" >&2
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echo "Reason: Native sandbox not active for bash command" >&2
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echo "" >&2
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# Platform-specific guidance
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case "$OSTYPE" in
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darwin*)
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echo "macOS: Seatbelt should be built-in. Check Claude Code installation." >&2
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;;
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linux*)
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echo "Linux: Install bubblewrap and socat:" >&2
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echo " sudo apt-get install bubblewrap socat # Ubuntu/Debian" >&2
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echo " sudo dnf install bubblewrap socat # Fedora" >&2
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;;
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*)
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echo "Platform: $OSTYPE (sandbox may not be supported)" >&2
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;;
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esac
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echo "" >&2
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echo "Options:" >&2
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echo " 1. Enable sandbox: /sandbox command in Claude Code" >&2
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echo " 2. Disable validation: Set SANDBOX_VALIDATION_STRICT=false" >&2
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echo " 3. Remove production marker: rm $PRODUCTION_MARKER" >&2
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echo "" >&2
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if [ "$STRICT_MODE" = "true" ]; then
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echo "⛔ Command BLOCKED (strict mode enabled)" >&2
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exit 2 # Block command execution
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else
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echo "⚠️ Command ALLOWED (production environment detected but strict mode disabled)" >&2
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exit 0 # Allow with warning
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fi
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fi
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# Sandbox active - allow command
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exit 0
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}
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main
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