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文章目录
- 开发平台基本信息
- 问题描述
- 解决方法
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 {@NonNullprivate 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 schememinSignatureScheme = 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);
+ }else {
+ throw new PackageParserException(
+ INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES,
+ baseCodePath + " has mismatched certificates");
+ }}} 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。