[MT8766][Android12] 增加应用安装白名单或者黑名单

开发平台基本信息

芯片: MT8766
版本: Android 12
kernel: msm-4.19

问题描述

在项目开发的时候，经常有一些客户，要求系统安装应用的时候需要进行验签；也就是系统默认不允许任何应用安装，应用安装的时候，会读取系统目录下存放的公钥，然后拿着公钥去解析需要安装的应用，只有匹配上签名的应用才能正常安装。

解决方法

• 应用验签的算法各种各样，也比较隐私，这里就不做展示了；这里仅提供应用安装拦截的方法；可以在安装的地方，读取设定的白名单，只有白名单内的应用才允许安装；或者读取设定的黑名单，除了黑名单内的应用禁止安装，其他的应用正常安装。具体怎么使用，就看具体需求。

--- a/frameworks/base/core/api/system-current.txt
+++ b/frameworks/base/core/api/system-current.txt
@@ -8892,6 +8892,7 @@ package android.permission {
     method public int checkDeviceIdentifierAccess(@Nullable String, @Nullable String, @Nullable String, int, int);
     method @NonNull @RequiresPermission(android.Manifest.permission.ADJUST_RUNTIME_PERMISSIONS_POLICY) public java.util.Set<java.lang.String> getAutoRevokeExemptionGrantedPackages();
     method @NonNull @RequiresPermission(android.Manifest.permission.ADJUST_RUNTIME_PERMISSIONS_POLICY) public java.util.Set<java.lang.String> getAutoRevokeExemptionRequestedPackages();
+    method public android.content.Context getPermissionContext();
     method @IntRange(from=0) @RequiresPermission(anyOf={android.Manifest.permission.ADJUST_RUNTIME_PERMISSIONS_POLICY, android.Manifest.permission.UPGRADE_RUNTIME_PERMISSIONS}) public int getRuntimePermissionsVersion();
     method @NonNull public java.util.List<android.permission.PermissionManager.SplitPermissionInfo> getSplitPermissions();

--- a/frameworks/base/core/java/android/content/pm/parsing/ParsingPackageUtils.java
+++ b/frameworks/base/core/java/android/content/pm/parsing/ParsingPackageUtils.java
@@ -132,6 +132,17 @@ import java.util.Objects;
 import java.util.Set;
 import java.util.StringTokenizer;
 
+import android.os.SystemProperties;
+import android.provider.Settings;
+import android.content.Context;
+import android.util.Log;
+
@@ -275,7 +288,7 @@ public class ParsingPackageUtils {
                         return new ParsingPackageImpl(packageName, baseApkPath, path,
                                 manifestArray);
                     }
-                });
+                },mContext);
         try {
             result = parser.parsePackage(input, file, parseFlags);
             if (result.isError()) {
@@ -309,16 +322,19 @@ public class ParsingPackageUtils {
     @NonNull
     private List<PermissionManager.SplitPermissionInfo> mSplitPermissionInfos;
     private Callback mCallback;
+    private static Context mContext;
 
     public ParsingPackageUtils(boolean onlyCoreApps, String[] separateProcesses,
             DisplayMetrics displayMetrics,
             @NonNull List<PermissionManager.SplitPermissionInfo> splitPermissions,
-            @NonNull Callback callback) {
+            @NonNull Callback callback,
+            @NonNull Context context) {
         mOnlyCoreApps = onlyCoreApps;
         mSeparateProcesses = separateProcesses;
         mDisplayMetrics = displayMetrics;
         mSplitPermissionInfos = splitPermissions;
         mCallback = callback;
+        mContext = context;
     }
 
     /**
@@ -3043,6 +3059,11 @@ public class ParsingPackageUtils {
             @NonNull SigningDetails existingSigningDetails, int targetSdk) {
         int minSignatureScheme = ApkSignatureVerifier.getMinimumSignatureSchemeVersionForTargetSdk(
                 targetSdk);
 
+        boolean isAllow = false;
+
         if (isStaticSharedLibrary) {
             // must use v2 signing scheme
             minSignatureScheme = SigningDetails.SignatureSchemeVersion.SIGNING_BLOCK_V2;
@@ -3056,7 +3077,71 @@ public class ParsingPackageUtils {
                 verified = ApkSignatureVerifier.unsafeGetCertsWithoutVerification(
                         baseCodePath, SigningDetails.SignatureSchemeVersion.JAR);
             } else {
-                verified = ApkSignatureVerifier.verify(baseCodePath, minSignatureScheme);
+                String whiteListValue = null;
+                String[] whiteListArray = null;
+                if(mContext != null){
+                    if(mContext.getContentResolver()!=null){
+                        whiteListValue = Settings.System.getString(mContext.getContentResolver(), Settings.System.KEY_CERT_WHITE_LIST_ACTION);
+                    }
+
+                    if (whiteListValue != null){
+                        int count = 0;
+                        String packageName = null;
+                        PackageManager pm = mContext.getPackageManager();
+                        PackageInfo info = pm.getPackageArchiveInfo(baseCodePath, PackageManager.GET_ACTIVITIES);
+                        if(info!=null){
+                            ApplicationInfo appInfo = info.applicationInfo;
+                            packageName = appInfo.packageName;  //得到安装包名称
+                            Log.d(TAG, "packageName : " + packageName);
+
+                            whiteListArray  = whiteListValue.split(";");
+                            for(count=0; count < whiteListArray.length; count++){
+                                if(packageName.equals(whiteListArray[count])){
+                                    isAllow = true;
+                                    break;
+                                }else{
+                                    isAllow = false;
+                                }
+                            }
+                        }
+                    }else{
+                        Log.d(TAG, "whiteList is null");
+                    }
+                }
+ 				if (isAllow){
+ 					verified = ApkSignatureVerifier.verify(baseCodePath, minSignatureScheme);
+ 				}
             }
         } catch (PackageParserException e) {
             return input.error(PackageManager.INSTALL_PARSE_FAILED_NO_CERTIFICATES,

--- a/frameworks/base/core/java/android/permission/PermissionManager.java
+++ b/frameworks/base/core/java/android/permission/PermissionManager.java
@@ -161,6 +161,10 @@ public final class PermissionManager {
         mLegacyPermissionManager = context.getSystemService(LegacyPermissionManager.class);
     }
 
+    public Context getPermissionContext(){
+        return mContext;
+    }
+
--- a/frameworks/base/services/core/java/com/android/server/pm/parsing/PackageParser2.java
+++ b/frameworks/base/services/core/java/com/android/server/pm/parsing/PackageParser2.java
@@ -129,7 +129,7 @@ public class PackageParser2 implements AutoCloseable {
         mCacher = cacheDir == null ? null : new PackageCacher(cacheDir);
 
         parsingUtils = new ParsingPackageUtils(onlyCoreApps, separateProcesses, displayMetrics,
-                splitPermissions, callback);
+                splitPermissions, callback,permissionManager.getPermissionContext());
 
         ParseInput.Callback enforcementCallback = (changeId, packageName, targetSdkVersion) -> {
             ApplicationInfo appInfo = mSharedAppInfo.get();

主要就是在应用安装的那个类里面拿不到上下文，所以，只能通过构造类的时候，从上一层拿到上下文之后，再传进来。拿到上下文之后就可以获取Setting数据库，读出黑白名单列表，再跟当前安装的包名做对比，判断当前应用是否安装。