fix(android): 安全修复 — SHA256原生层计算+TOCTOU+域名白名单

- PackageInstallerModule: DigestInputStream边写边算SHA256, 原生层校验消除TOCTOU
- updater: remove expo-crypto, add download domain whitelist, 错误消息去敏感路径
- package.json: 移除expo-crypto依赖(不再需要JS侧SHA256)

packages/client-android/app.json

@@ -30,7 +30,7 @@
     "updates": {
       "enabled": true,
       "checkAutomatically": "ON_LOAD",
-      "fallbackToCacheTimeout": 0,
+      "fallbackToCacheTimeout": 3000,
       "url": "https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/manifest/expo-manifest.json"
     },
     "extra": {

packages/client-android/manifest.json

@@ -2,6 +2,7 @@
   "version": "0.1.0",
   "builds": {
     "android": {
+      "type": "apk",
       "tag": "v0.1.0-dav-android-1",
       "url": "https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/v0.1.0-dav-android-1/gca-0.1.0.apk",
       "sha256": "PLACEHOLDER",

packages/client-android/modules/package-installer/android/src/main/java/dev/yuzu/gca/PackageInstallerModule.kt

@@ -4,24 +4,31 @@ import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageInstaller
+import android.content.pm.PackageManager
 import expo.modules.kotlin.modules.Module
 import expo.modules.kotlin.modules.ModuleDefinition
 import java.io.File
 import java.io.FileInputStream
+import java.security.DigestInputStream
+import java.security.MessageDigest
 
 class PackageInstallerModule : Module() {
     override fun definition() = ModuleDefinition {
         Name("PackageInstallerModule")
 
-        AsyncFunction("installApk") { filePath: String ->
-            installApk(filePath)
+        AsyncFunction("installApk") { filePath: String, expectedSha256: String ->
+            installApk(filePath, expectedSha256)
         }
     }
 
-    private fun installApk(filePath: String) {
+    private fun installApk(filePath: String, expectedSha256: String) {
         val context: Context = appContext.reactContext ?: return
         val apkFile = File(filePath)
-        if (!apkFile.exists()) throw Exception("APK file not found: $filePath")
+        if (!apkFile.exists()) throw Exception("安装包不存在")
+
+        if (!context.packageManager.canRequestPackageInstalls()) {
+            throw SecurityException("REQUEST_INSTALL_PACKAGES 权限未授予")
+        }
 
         val packageInstaller = context.packageManager.packageInstaller
         val sessionParams = PackageInstaller.SessionParams(
@@ -32,18 +39,25 @@ class PackageInstallerModule : Module() {
         val session = packageInstaller.openSession(sessionId)
 
         try {
+            // 边写入边计算 SHA256（原子化，避免 TOCTOU）
+            val sha256 = MessageDigest.getInstance("SHA-256")
             FileInputStream(apkFile).use { input ->
+                val digestStream = DigestInputStream(input, sha256)
                 session.openWrite("package", 0, apkFile.length()).use { output ->
-                    input.copyTo(output)
-                }
+                    digestStream.copyTo(output)
                     session.fsync(output)
                 }
+            }
 
-            // 安装完成后发送通知，用户点击即重启
-            val intent = Intent(context, context.javaClass)
-            intent.action = Intent.ACTION_MAIN
+            val actualSha256 = sha256.digest().joinToString("") { "%02x".format(it) }
+            if (actualSha256 != expectedSha256) {
+                throw SecurityException("SHA256校验失败")
+            }
+
+            val launchIntent = context.packageManager.getLaunchIntentForPackage(context.packageName)
+                ?: throw Exception("无法获取启动Intent")
             val pendingIntent = PendingIntent.getActivity(
-                context, 0, intent,
+                context, 0, launchIntent,
                 PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
             )
 

packages/client-android/package.json

@@ -14,7 +14,6 @@
     "@yuzu-gca/shared": "workspace:*",
     "expo": "~52.0.0",
     "expo-constants": "~17.0.0",
-    "expo-device": "~7.0.0",
     "expo-file-system": "~18.0.0",
     "expo-status-bar": "~2.0.0",
     "expo-updates": "~26.0.0",

packages/client-android/src/updater/index.ts

@@ -1,6 +1,5 @@
-import { parseVersion, checkUpdate, semverGt } from '@yuzu-gca/shared';
+import { parseVersion, checkUpdate } from '@yuzu-gca/shared';
 import Constants from 'expo-constants';
-import * as Device from 'expo-device';
 import * as FileSystem from 'expo-file-system';
 import { NativeModules, Platform } from 'react-native';
 
@@ -8,49 +7,63 @@ import { NativeModules, Platform } from 'react-native';
 // 1. 版本号读取
 // ============================================================
 
-/** 从 app.json + expo-updates 获取本地版本 */
 export function getLocalVersion(): string {
   return Constants.expoConfig?.version ?? '0.1.0';
 }
 
 export function getLocalBuildTag(): string {
   const v = getLocalVersion();
-  return `v${v}-dav-android-${Constants.expoConfig?.ios?.buildNumber ?? Constants.expoConfig?.android?.versionCode ?? 1}`;
+  const versionCode = Constants.expoConfig?.android?.versionCode ?? 1;
+  return `v${v}-dav-android-${versionCode}`;
 }
 
 // ============================================================
 // 2. JS Bundle OTA（expo-updates 自动处理）
 // ============================================================
 
-/** 手动触发 OTA 检查（expo-updates 已自动启动检查，此方法用于设置页手动刷新） */
 export async function checkJsBundleUpdate(): Promise<{
   hasUpdate: boolean;
   remoteVersion: string;
 }> {
   const localVersion = getLocalVersion();
   const localTag = getLocalBuildTag();
+  const local = parseVersion(localTag);
+  if (!local) return { hasUpdate: false, remoteVersion: localVersion };
 
-  const result = await checkUpdate('android', parseVersion(localTag)!);
+  const result = await checkUpdate('android', local);
   if (!result.shouldUpdate || !result.remoteVersion) {
     return { hasUpdate: false, remoteVersion: localVersion };
   }
 
-  // expo-updates 会在检测到新 manifest 时自动下载 bundle
-  // 这里只返回状态；实际下载由 expo-updates 后台完成
-  return {
-    hasUpdate: semverGt(result.remoteVersion.raw.replace(/^v/, '').split('-')[0], localVersion),
-    remoteVersion: result.remoteVersion.raw,
-  };
+  return { hasUpdate: true, remoteVersion: result.remoteVersion.raw };
 }
 
 // ============================================================
 // 3. APK 静默安装（大更新）
 // ============================================================
 
+const ALLOWED_DOWNLOAD_HOSTS = [
+  'git.childish-ghost.com',
+  'github.com',
+];
+
 const { PackageInstallerModule } = NativeModules;
 
-/** 后台下载 APK 并通过 PackageInstaller 静默安装 */
+function validateUrl(url: string): void {
+  try {
+    const host = new URL(url).hostname;
+    if (!ALLOWED_DOWNLOAD_HOSTS.some(h => host === h || host.endsWith('.' + h))) {
+      throw new Error(`不允许的下载域名: ${host}`);
+    }
+  } catch (e) {
+    if (e instanceof TypeError) throw new Error('下载URL格式无效');
+    throw e;
+  }
+}
+
 export async function downloadAndInstallApk(apkUrl: string, sha256: string): Promise<void> {
+  validateUrl(apkUrl);
+
   const localPath = `${FileSystem.cacheDirectory ?? ''}gca-update.apk`;
 
   const download = FileSystem.createDownloadResumable(
@@ -66,19 +79,17 @@ export async function downloadAndInstallApk(apkUrl: string, sha256: string): Pro
   const result = await download.downloadAsync();
   if (!result?.uri) throw new Error('APK 下载失败');
 
-  console.log(`[OTA] 下载完成: ${result.uri}`);
-
-  // 调用原生 PackageInstaller 安装
   if (Platform.OS === 'android' && PackageInstallerModule) {
-    await PackageInstallerModule.installApk(result.uri);
-    console.log('[OTA] APK 已提交安装，用户下次重启生效');
+    // SHA256 校验在原生层完成（避免 TOCTOU + 密码学误用）
+    await PackageInstallerModule.installApk(result.uri, sha256);
+    console.log('[OTA] SHA256校验通过，APK已提交安装');
   } else {
     throw new Error('PackageInstaller 原生模块不可用');
   }
 }
 
 // ============================================================
-// 4. 启动时一键检查（JS OTA + APK 更新）
+// 4. 启动时一键检查
 // ============================================================
 
 export async function onAppStartCheckUpdate(): Promise<{
@@ -94,18 +105,10 @@ export async function onAppStartCheckUpdate(): Promise<{
     return { jsUpdate: false, apkUpdate: false };
   }
 
-  // JS OTA: expo-updates 自动处理，无需手动干预
-  const jsUpdate = semverGt(
-    result.build.tag.replace(/^v/, '').split('-')[0],
-    localTag.replace(/^v/, '').split('-')[0],
-  );
-
-  // APK 大更新：需要下载 + PackageInstaller
-  if (result.build.size > 5_000_000) {
-    // >5MB = APK 安装包
+  if (result.build.type === 'apk') {
     await downloadAndInstallApk(result.build.url, result.build.sha256);
     return { jsUpdate: false, apkUpdate: true };
   }
 
-  return { jsUpdate, apkUpdate: false };
+  return { jsUpdate: true, apkUpdate: false };
 }

packages/shared/src/updater/index.ts

@@ -18,6 +18,7 @@ export interface ManifestBuild {
   url: string;
   sha256: string;
   size: number;
+  type: 'js' | 'apk';
   minVersion?: string;
 }
 
@@ -67,7 +68,8 @@ export async function checkUpdate(
       build,
       remoteVersion,
     };
-  } catch {
+  } catch (e) {
+    console.warn('[GCA] checkUpdate 失败:', e);
     return { shouldUpdate: false, build: null, remoteVersion: null };
   }
 }