Merge PR #77: add security hardening (SECURITY.md, workspace restriction for file tools)

.gitignore

@@ -15,3 +15,5 @@ docs/
 *.pyzz
 .venv/
 __pycache__/
+poetry.lock
+.pytest_cache/

SECURITY.md

@@ -0,0 +1,264 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in nanobot, please report it by:
+
+1. **DO NOT** open a public GitHub issue
+2. Create a private security advisory on GitHub or contact the repository maintainers
+3. Include:
+   - Description of the vulnerability
+   - Steps to reproduce
+   - Potential impact
+   - Suggested fix (if any)
+
+We aim to respond to security reports within 48 hours.
+
+## Security Best Practices
+
+### 1. API Key Management
+
+**CRITICAL**: Never commit API keys to version control.
+
+```bash
+# ✅ Good: Store in config file with restricted permissions
+chmod 600 ~/.nanobot/config.json
+
+# ❌ Bad: Hardcoding keys in code or committing them
+```
+
+**Recommendations:**
+- Store API keys in `~/.nanobot/config.json` with file permissions set to `0600`
+- Consider using environment variables for sensitive keys
+- Use OS keyring/credential manager for production deployments
+- Rotate API keys regularly
+- Use separate API keys for development and production
+
+### 2. Channel Access Control
+
+**IMPORTANT**: Always configure `allowFrom` lists for production use.
+
+```json
+{
+  "channels": {
+    "telegram": {
+      "enabled": true,
+      "token": "YOUR_BOT_TOKEN",
+      "allowFrom": ["123456789", "987654321"]
+    },
+    "whatsapp": {
+      "enabled": true,
+      "allowFrom": ["+1234567890"]
+    }
+  }
+}
+```
+
+**Security Notes:**
+- Empty `allowFrom` list will **ALLOW ALL** users (open by default for personal use)
+- Get your Telegram user ID from `@userinfobot`
+- Use full phone numbers with country code for WhatsApp
+- Review access logs regularly for unauthorized access attempts
+
+### 3. Shell Command Execution
+
+The `exec` tool can execute shell commands. While dangerous command patterns are blocked, you should:
+
+- ✅ Review all tool usage in agent logs
+- ✅ Understand what commands the agent is running
+- ✅ Use a dedicated user account with limited privileges
+- ✅ Never run nanobot as root
+- ❌ Don't disable security checks
+- ❌ Don't run on systems with sensitive data without careful review
+
+**Blocked patterns:**
+- `rm -rf /` - Root filesystem deletion
+- Fork bombs
+- Filesystem formatting (`mkfs.*`)
+- Raw disk writes
+- Other destructive operations
+
+### 4. File System Access
+
+File operations have path traversal protection, but:
+
+- ✅ Run nanobot with a dedicated user account
+- ✅ Use filesystem permissions to protect sensitive directories
+- ✅ Regularly audit file operations in logs
+- ❌ Don't give unrestricted access to sensitive files
+
+### 5. Network Security
+
+**API Calls:**
+- All external API calls use HTTPS by default
+- Timeouts are configured to prevent hanging requests
+- Consider using a firewall to restrict outbound connections if needed
+
+**WhatsApp Bridge:**
+- The bridge runs on `localhost:3001` by default
+- If exposing to network, use proper authentication and TLS
+- Keep authentication data in `~/.nanobot/whatsapp-auth` secure (mode 0700)
+
+### 6. Dependency Security
+
+**Critical**: Keep dependencies updated!
+
+```bash
+# Check for vulnerable dependencies
+pip install pip-audit
+pip-audit
+
+# Update to latest secure versions
+pip install --upgrade nanobot-ai
+```
+
+For Node.js dependencies (WhatsApp bridge):
+```bash
+cd bridge
+npm audit
+npm audit fix
+```
+
+**Important Notes:**
+- Keep `litellm` updated to the latest version for security fixes
+- We've updated `ws` to `>=8.17.1` to fix DoS vulnerability
+- Run `pip-audit` or `npm audit` regularly
+- Subscribe to security advisories for nanobot and its dependencies
+
+### 7. Production Deployment
+
+For production use:
+
+1. **Isolate the Environment**
+   ```bash
+   # Run in a container or VM
+   docker run --rm -it python:3.11
+   pip install nanobot-ai
+   ```
+
+2. **Use a Dedicated User**
+   ```bash
+   sudo useradd -m -s /bin/bash nanobot
+   sudo -u nanobot nanobot gateway
+   ```
+
+3. **Set Proper Permissions**
+   ```bash
+   chmod 700 ~/.nanobot
+   chmod 600 ~/.nanobot/config.json
+   chmod 700 ~/.nanobot/whatsapp-auth
+   ```
+
+4. **Enable Logging**
+   ```bash
+   # Configure log monitoring
+   tail -f ~/.nanobot/logs/nanobot.log
+   ```
+
+5. **Use Rate Limiting**
+   - Configure rate limits on your API providers
+   - Monitor usage for anomalies
+   - Set spending limits on LLM APIs
+
+6. **Regular Updates**
+   ```bash
+   # Check for updates weekly
+   pip install --upgrade nanobot-ai
+   ```
+
+### 8. Development vs Production
+
+**Development:**
+- Use separate API keys
+- Test with non-sensitive data
+- Enable verbose logging
+- Use a test Telegram bot
+
+**Production:**
+- Use dedicated API keys with spending limits
+- Restrict file system access
+- Enable audit logging
+- Regular security reviews
+- Monitor for unusual activity
+
+### 9. Data Privacy
+
+- **Logs may contain sensitive information** - secure log files appropriately
+- **LLM providers see your prompts** - review their privacy policies
+- **Chat history is stored locally** - protect the `~/.nanobot` directory
+- **API keys are in plain text** - use OS keyring for production
+
+### 10. Incident Response
+
+If you suspect a security breach:
+
+1. **Immediately revoke compromised API keys**
+2. **Review logs for unauthorized access**
+   ```bash
+   grep "Access denied" ~/.nanobot/logs/nanobot.log
+   ```
+3. **Check for unexpected file modifications**
+4. **Rotate all credentials**
+5. **Update to latest version**
+6. **Report the incident** to maintainers
+
+## Security Features
+
+### Built-in Security Controls
+
+✅ **Input Validation**
+- Path traversal protection on file operations
+- Dangerous command pattern detection
+- Input length limits on HTTP requests
+
+✅ **Authentication**
+- Allow-list based access control
+- Failed authentication attempt logging
+- Open by default (configure allowFrom for production use)
+
+✅ **Resource Protection**
+- Command execution timeouts (60s default)
+- Output truncation (10KB limit)
+- HTTP request timeouts (10-30s)
+
+✅ **Secure Communication**
+- HTTPS for all external API calls
+- TLS for Telegram API
+- WebSocket security for WhatsApp bridge
+
+## Known Limitations
+
+⚠️ **Current Security Limitations:**
+
+1. **No Rate Limiting** - Users can send unlimited messages (add your own if needed)
+2. **Plain Text Config** - API keys stored in plain text (use keyring for production)
+3. **No Session Management** - No automatic session expiry
+4. **Limited Command Filtering** - Only blocks obvious dangerous patterns
+5. **No Audit Trail** - Limited security event logging (enhance as needed)
+
+## Security Checklist
+
+Before deploying nanobot:
+
+- [ ] API keys stored securely (not in code)
+- [ ] Config file permissions set to 0600
+- [ ] `allowFrom` lists configured for all channels
+- [ ] Running as non-root user
+- [ ] File system permissions properly restricted
+- [ ] Dependencies updated to latest secure versions
+- [ ] Logs monitored for security events
+- [ ] Rate limits configured on API providers
+- [ ] Backup and disaster recovery plan in place
+- [ ] Security review of custom skills/tools
+
+## Updates
+
+**Last Updated**: 2026-02-03
+
+For the latest security updates and announcements, check:
+- GitHub Security Advisories: https://github.com/HKUDS/nanobot/security/advisories
+- Release Notes: https://github.com/HKUDS/nanobot/releases
+
+## License
+
+See LICENSE file for details.

bridge/package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@whiskeysockets/baileys": "7.0.0-rc.9",
-    "ws": "^8.17.0",
+    "ws": "^8.17.1",
     "qrcode-terminal": "^0.12.0",
     "pino": "^9.0.0"
   },

nanobot/agent/loop.py

@@ -73,11 +73,12 @@ class AgentLoop:
     
     def _register_default_tools(self) -> None:
         """Register the default set of tools."""
-        # File tools
+        # File tools (restrict to workspace if configured)
-        self.tools.register(ReadFileTool())
+        allowed_dir = self.workspace if self.exec_config.restrict_to_workspace else None
-        self.tools.register(WriteFileTool())
+        self.tools.register(ReadFileTool(allowed_dir=allowed_dir))
-        self.tools.register(EditFileTool())
+        self.tools.register(WriteFileTool(allowed_dir=allowed_dir))
-        self.tools.register(ListDirTool())
+        self.tools.register(EditFileTool(allowed_dir=allowed_dir))
+        self.tools.register(ListDirTool(allowed_dir=allowed_dir))
         
         # Shell tool
         self.tools.register(ExecTool(

nanobot/agent/subagent.py

@@ -96,9 +96,10 @@ class SubagentManager:
         try:
             # Build subagent tools (no message tool, no spawn tool)
             tools = ToolRegistry()
-            tools.register(ReadFileTool())
+            allowed_dir = self.workspace if self.exec_config.restrict_to_workspace else None
-            tools.register(WriteFileTool())
+            tools.register(ReadFileTool(allowed_dir=allowed_dir))
-            tools.register(ListDirTool())
+            tools.register(WriteFileTool(allowed_dir=allowed_dir))
+            tools.register(ListDirTool(allowed_dir=allowed_dir))
             tools.register(ExecTool(
                 working_dir=str(self.workspace),
                 timeout=self.exec_config.timeout,

nanobot/agent/tools/filesystem.py

@@ -6,9 +6,20 @@ from typing import Any
 from nanobot.agent.tools.base import Tool
 
 
+def _resolve_path(path: str, allowed_dir: Path | None = None) -> Path:
+    """Resolve path and optionally enforce directory restriction."""
+    resolved = Path(path).expanduser().resolve()
+    if allowed_dir and not str(resolved).startswith(str(allowed_dir.resolve())):
+        raise PermissionError(f"Path {path} is outside allowed directory {allowed_dir}")
+    return resolved
+
+
 class ReadFileTool(Tool):
     """Tool to read file contents."""
     
+    def __init__(self, allowed_dir: Path | None = None):
+        self._allowed_dir = allowed_dir
+
     @property
     def name(self) -> str:
         return "read_file"
@@ -32,7 +43,7 @@ class ReadFileTool(Tool):
     
     async def execute(self, path: str, **kwargs: Any) -> str:
         try:
-            file_path = Path(path).expanduser()
+            file_path = _resolve_path(path, self._allowed_dir)
             if not file_path.exists():
                 return f"Error: File not found: {path}"
             if not file_path.is_file():
@@ -40,8 +51,8 @@ class ReadFileTool(Tool):
             
             content = file_path.read_text(encoding="utf-8")
             return content
-        except PermissionError:
+        except PermissionError as e:
-            return f"Error: Permission denied: {path}"
+            return f"Error: {e}"
         except Exception as e:
             return f"Error reading file: {str(e)}"
 
@@ -49,6 +60,9 @@ class ReadFileTool(Tool):
 class WriteFileTool(Tool):
     """Tool to write content to a file."""
     
+    def __init__(self, allowed_dir: Path | None = None):
+        self._allowed_dir = allowed_dir
+
     @property
     def name(self) -> str:
         return "write_file"
@@ -76,12 +90,12 @@ class WriteFileTool(Tool):
     
     async def execute(self, path: str, content: str, **kwargs: Any) -> str:
         try:
-            file_path = Path(path).expanduser()
+            file_path = _resolve_path(path, self._allowed_dir)
             file_path.parent.mkdir(parents=True, exist_ok=True)
             file_path.write_text(content, encoding="utf-8")
             return f"Successfully wrote {len(content)} bytes to {path}"
-        except PermissionError:
+        except PermissionError as e:
-            return f"Error: Permission denied: {path}"
+            return f"Error: {e}"
         except Exception as e:
             return f"Error writing file: {str(e)}"
 
@@ -89,6 +103,9 @@ class WriteFileTool(Tool):
 class EditFileTool(Tool):
     """Tool to edit a file by replacing text."""
     
+    def __init__(self, allowed_dir: Path | None = None):
+        self._allowed_dir = allowed_dir
+
     @property
     def name(self) -> str:
         return "edit_file"
@@ -120,7 +137,7 @@ class EditFileTool(Tool):
     
     async def execute(self, path: str, old_text: str, new_text: str, **kwargs: Any) -> str:
         try:
-            file_path = Path(path).expanduser()
+            file_path = _resolve_path(path, self._allowed_dir)
             if not file_path.exists():
                 return f"Error: File not found: {path}"
             
@@ -138,8 +155,8 @@ class EditFileTool(Tool):
             file_path.write_text(new_content, encoding="utf-8")
             
             return f"Successfully edited {path}"
-        except PermissionError:
+        except PermissionError as e:
-            return f"Error: Permission denied: {path}"
+            return f"Error: {e}"
         except Exception as e:
             return f"Error editing file: {str(e)}"
 
@@ -147,6 +164,9 @@ class EditFileTool(Tool):
 class ListDirTool(Tool):
     """Tool to list directory contents."""
     
+    def __init__(self, allowed_dir: Path | None = None):
+        self._allowed_dir = allowed_dir
+
     @property
     def name(self) -> str:
         return "list_dir"
@@ -170,7 +190,7 @@ class ListDirTool(Tool):
     
     async def execute(self, path: str, **kwargs: Any) -> str:
         try:
-            dir_path = Path(path).expanduser()
+            dir_path = _resolve_path(path, self._allowed_dir)
             if not dir_path.exists():
                 return f"Error: Directory not found: {path}"
             if not dir_path.is_dir():
@@ -185,7 +205,7 @@ class ListDirTool(Tool):
                 return f"Directory {path} is empty"
             
             return "\n".join(items)
-        except PermissionError:
+        except PermissionError as e:
-            return f"Error: Permission denied: {path}"
+            return f"Error: {e}"
         except Exception as e:
             return f"Error listing directory: {str(e)}"

nanobot/channels/base.py

@@ -3,6 +3,8 @@
 from abc import ABC, abstractmethod
 from typing import Any
 
+from loguru import logger
+
 from nanobot.bus.events import InboundMessage, OutboundMessage
 from nanobot.bus.queue import MessageBus
 
@@ -102,6 +104,10 @@ class BaseChannel(ABC):
             metadata: Optional channel-specific metadata.
         """
         if not self.is_allowed(sender_id):
+            logger.warning(
+                f"Access denied for sender {sender_id} on channel {self.name}. "
+                f"Add them to allowFrom list in config to grant access."
+            )
             return
         
         msg = InboundMessage(