| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.signature.cts; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Executable; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.List; |
| |
| public class DexMemberChecker { |
| |
| public interface Observer { |
| void classAccessible(boolean accessible, DexMember member); |
| void fieldAccessibleViaReflection(boolean accessible, DexField field); |
| void fieldAccessibleViaJni(boolean accessible, DexField field); |
| void methodAccessibleViaReflection(boolean accessible, DexMethod method); |
| void methodAccessibleViaJni(boolean accessible, DexMethod method); |
| } |
| |
| public static void init() { |
| System.loadLibrary("cts_dexchecker"); |
| } |
| |
| private static void call_VMDebug_allowHiddenApiReflectionFrom(Class<?> klass) throws Exception { |
| Method method = null; |
| |
| try { |
| Class<?> vmdebug = Class.forName("dalvik.system.VMDebug"); |
| method = vmdebug.getDeclaredMethod("allowHiddenApiReflectionFrom", Class.class); |
| } catch (Exception ex) { |
| // Could not find the method. Report the problem as a RuntimeException. |
| throw new RuntimeException(ex); |
| } |
| |
| try { |
| method.invoke(null, klass); |
| } catch (InvocationTargetException ex) { |
| // Rethrow the original exception. |
| Throwable cause = ex.getCause(); |
| // Please the compiler's 'throws' static analysis. |
| if (cause instanceof Exception) { |
| throw (Exception) cause; |
| } else { |
| throw (Error) cause; |
| } |
| } |
| } |
| |
| public static boolean requestExemptionFromHiddenApiChecks() throws Exception { |
| try { |
| call_VMDebug_allowHiddenApiReflectionFrom(DexMemberChecker.class); |
| return true; |
| } catch (SecurityException ex) { |
| return false; |
| } |
| } |
| |
| public static void checkSingleMember(DexMember dexMember, DexMemberChecker.Observer observer) { |
| Class<?> klass = findClass(dexMember); |
| if (klass == null) { |
| // Class not found. Therefore its members are not visible. |
| observer.classAccessible(false, dexMember); |
| return; |
| } |
| observer.classAccessible(true, dexMember); |
| |
| if (dexMember instanceof DexField) { |
| DexField field = (DexField) dexMember; |
| observer.fieldAccessibleViaReflection( |
| hasMatchingField_Reflection(klass, field), |
| field); |
| observer.fieldAccessibleViaJni( |
| hasMatchingField_JNI(klass, field), |
| field); |
| } else if (dexMember instanceof DexMethod) { |
| DexMethod method = (DexMethod) dexMember; |
| observer.methodAccessibleViaReflection( |
| hasMatchingMethod_Reflection(klass, method), |
| method); |
| observer.methodAccessibleViaJni( |
| hasMatchingMethod_JNI(klass, method), |
| method); |
| } else { |
| throw new IllegalStateException("Unexpected type of dex member"); |
| } |
| } |
| |
| private static boolean typesMatch(Class<?>[] classes, List<String> typeNames) { |
| if (classes.length != typeNames.size()) { |
| return false; |
| } |
| for (int i = 0; i < classes.length; ++i) { |
| if (!classes[i].getTypeName().equals(typeNames.get(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static Class<?> findClass(DexMember dexMember) { |
| try { |
| // Try to find the class. Do not initialize it - we do not want to run |
| // static initializers. |
| return Class.forName(dexMember.getJavaClassName(), /* initialize */ false, |
| DexMemberChecker.class.getClassLoader()); |
| } catch (ClassNotFoundException ex) { |
| return null; |
| } |
| } |
| |
| private static boolean hasMatchingField_Reflection(Class<?> klass, DexField dexField) { |
| try { |
| klass.getDeclaredField(dexField.getName()); |
| return true; |
| } catch (NoSuchFieldException ex) { |
| return false; |
| } |
| } |
| |
| private static boolean hasMatchingField_JNI(Class<?> klass, DexField dexField) { |
| Field ifield = getField_JNI(klass, dexField.getName(), dexField.getDexType()); |
| Field sfield = getStaticField_JNI(klass, dexField.getName(), dexField.getDexType()); |
| return (ifield != null && ifield.getDeclaringClass() == klass) || |
| (sfield != null && sfield.getDeclaringClass() == klass); |
| } |
| |
| private static boolean hasMatchingMethod_Reflection(Class<?> klass, DexMethod dexMethod) { |
| List<String> methodParams = dexMethod.getJavaParameterTypes(); |
| |
| if (dexMethod.isConstructor()) { |
| for (Constructor constructor : klass.getDeclaredConstructors()) { |
| if (typesMatch(constructor.getParameterTypes(), methodParams)) { |
| return true; |
| } |
| } |
| } else { |
| String methodReturnType = dexMethod.getJavaType(); |
| for (Method method : klass.getDeclaredMethods()) { |
| if (method.getName().equals(dexMethod.getName()) |
| && method.getReturnType().getTypeName().equals(methodReturnType) |
| && typesMatch(method.getParameterTypes(), methodParams)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private static boolean hasMatchingMethod_JNI(Class<?> klass, DexMethod dexMethod) { |
| Executable imethod = getMethod_JNI(klass, dexMethod.getName(), dexMethod.getDexSignature()); |
| Executable smethod = dexMethod.isConstructor() ? null : |
| getStaticMethod_JNI(klass, dexMethod.getName(), dexMethod.getDexSignature()); |
| return (imethod != null && imethod.getDeclaringClass() == klass) || |
| (smethod != null && smethod.getDeclaringClass() == klass); |
| } |
| |
| private static native Field getField_JNI(Class<?> klass, String name, String type); |
| private static native Field getStaticField_JNI(Class<?> klass, String name, String type); |
| private static native Executable getMethod_JNI(Class<?> klass, String name, String signature); |
| private static native Executable getStaticMethod_JNI(Class<?> klass, String name, |
| String signature); |
| |
| } |