Auditing the Tauri IPC command interface
Tauri applications communicate between the frontend WebView and the native operating system using Inter-Process Communication (IPC) commands. These commands are Rust functions marked with the #[tauri::command] attribute.
During a penetration test, we trace how these commands receive data from the frontend. A common vulnerability is missing sanitization. If a Rust command accepts a file path string from JavaScript and writes files to disk without validating the path, an attacker can exploit this to write arbitrary files outside the application sandbox (Path Traversal).
// VULNERABLE: Direct path execution from frontend
#[tauri::command]
fn read_user_file(file_path: String) -> Result<String, String> {
std::fs::read_to_string(file_path).map_err(|e| e.to_string()) // Hookable path
}
// SECURE: Restricting to sandboxed folders
#[tauri::command]
fn read_secure_file(app_handle: tauri::AppHandle, file_name: String) -> Result<String, String> {
let secure_dir = app_handle.path_resolver().app_data_dir().ok_or("No directory found")?;
let safe_path = secure_dir.join(file_name);
// Perform canonicalization checks to block path traversal
std::fs::read_to_string(safe_path).map_err(|e| e.to_string())
}Command injection on Rust backend exposes local shell
During a security audit of a desktop stock analysis client built in Tauri, we found a Rust command that accepted a system process name as an argument. By injecting a shell separator: "analyzer; cat /etc/passwd" we forced the Rust backend to execute our command, leaking local system credentials to the WebView interface.
Configuring filesystem scopes and CSP policies
Tauri's configuration file (tauri.conf.json) defines what resources the frontend can access. We check if your application specifies strict scopes for filesystem and network access:
- Filesystem Scopes: If your configuration file allows wildcards like
$HOME/*, any XSS in your frontend can lead to complete local file system exposure. Keep scopes restricted to specific data folders. - Content Security Policy (CSP): We check if you restrict the load of remote scripts and styles. A strong CSP blocks attackers from loading malicious scripts from external servers.
Tauri Security Checklist
If your application is built on Tauri, apply these controls:
- Sanitize IPC inputs: Parse all arguments passed from JavaScript using type-safe Rust structures. Never pass raw commands or unchecked file paths directly to system operations.
- Strict tauri.conf.json: Set filesystem scopes to the absolute minimum required. Disable unused APIs (like database access or system shell) from the Tauri configuration.
- Run regular cargo audit: Check your compiled Rust dependencies for known security warnings.
Get your Tauri app audited
Tauri's security architecture is robust when configured correctly, but logical flaws in Rust commands can bypass all default protections. We will review your Rust source code, analyze your configurations, and test your IPC boundaries.