android-legacy-security
Harden Intent handling, WebView configuration, and FileProvider access in Android apps. Use when securing Intent extras, configuring WebViews, or exposing files via FileProvider.
What this skill does
# Android Legacy Security Standards ## **Priority: P0** ## 1. Secure Intents and Components - Set `android:exported="false"` for all internal Activities/Services unless needed for deep links. - Verify `resolveActivity` before starting implicit intents. - Treat all incoming Intent extras as untrusted — validate all schema/data types. See [hardening examples](references/implementation.md) for manifest and component restrictions. ## 2. Lock Down WebViews - Default to `javaScriptEnabled = false`. Use `WebViewClient` and `WebChromeClient` to restrict navigation. - Disable `allowFileAccess` and `allowFileAccessFromFileURLs` to prevent local file theft via XSS. - If using `@JavascriptInterface` (API 17+), strictly limit exposed API surface. See [hardening examples](references/implementation.md) for WebView lockdown patterns. ## 3. Protect Storage and Files - **NEVER expose `file://` URIs**. Use `FileProvider` to generate `content://` URIs with temporary permissions. - Use `EncryptedSharedPreferences` for auth tokens and PII. Never use `MODE_WORLD_READABLE`. - Use `NetworkSecurityConfig` to disable `cleartextTrafficPermitted` and implement certificate pinning. ## Anti-Patterns - **No Implicit Intents Internally**: Use explicit intents with component class name. - **No MODE_WORLD_READABLE**: Never use for SharedPreferences or files. ## References - [Hardening Examples](references/implementation.md)
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