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/*
* Copyright 2014 - Present Rafael Winterhalter
*
* 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 net.bytebuddy.build;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.asm.AsmVisitorWrapper;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.modifier.FieldManifestation;
import net.bytebuddy.description.modifier.Ownership;
import net.bytebuddy.description.modifier.Visibility;
import net.bytebuddy.description.type.TypeDefinition;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.StackSize;
import net.bytebuddy.pool.TypePool;
import net.bytebuddy.utility.JavaType;
import net.bytebuddy.utility.OpenedClassReader;
import net.bytebuddy.utility.nullability.MaybeNull;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import java.lang.annotation.*;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import static net.bytebuddy.matcher.ElementMatchers.*;
/**
* A build tool plugin that instruments methods to dispatch to methods {@code java.security.AccessController} with equal signature.
* This can be useful to avoid using types from the {@code java.security} package which were deprecated for removal in Java 17.
* Annotated methods are dispatched to the JVM's access controller only if this type is available on the current VM, and if no system
* property is added and set to disable such dispatch. In the process, {@code java.security.AccessControlContext} is represented by
* {@link Object}.
*/
@HashCodeAndEqualsPlugin.Enhance
public class AccessControllerPlugin extends Plugin.ForElementMatcher implements Plugin.Factory {
/**
* The binary name of {@code java.security.AccessController}.
*/
private static final String ACCESS_CONTROLLER = "java.security.AccessController";
/**
* The name of the generated field.
*/
private static final String NAME = "ACCESS_CONTROLLER";
/**
* An empty array to create frames without additional allocation.
*/
private static final Object[] EMPTY = new Object[0];
/**
* A map to all signatures of {@code java.security.AccessController} from a signature that does not contain any
* types that are deprecated for removal.
*/
private static final Map SIGNATURES;
/*
* Adds all relevant access controller signatures to validating collection.
*/
static {
SIGNATURES = new HashMap();
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class)), new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
TypeDescription.ForLoadedType.of(Object.class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub()));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(Permission[].class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub(),
TypeDescription.ForLoadedType.of(Permission[].class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(Permission[].class)), new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub(),
TypeDescription.ForLoadedType.of(Permission[].class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class)), new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
TypeDescription.ForLoadedType.of(Object.class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub()));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(Permission[].class)), new MethodDescription.SignatureToken("doPrivileged",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub(),
TypeDescription.ForLoadedType.of(Permission[].class)));
SIGNATURES.put(new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(Permission[].class)), new MethodDescription.SignatureToken("doPrivilegedWithCombiner",
TypeDescription.ForLoadedType.of(Object.class),
TypeDescription.ForLoadedType.of(PrivilegedExceptionAction.class),
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub(),
TypeDescription.ForLoadedType.of(Permission[].class)));
SIGNATURES.put(new MethodDescription.SignatureToken("getContext",
TypeDescription.ForLoadedType.of(Object.class)), new MethodDescription.SignatureToken("getContext",
JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub()));
SIGNATURES.put(new MethodDescription.SignatureToken("checkPermission",
TypeDescription.ForLoadedType.of(void.class),
TypeDescription.ForLoadedType.of(Permission.class)), new MethodDescription.SignatureToken("checkPermission",
TypeDescription.ForLoadedType.of(void.class),
TypeDescription.ForLoadedType.of(Permission.class)));
}
/**
* The property to control if the access controller should be used even
* if available or {@code null} if such a property should not be available.
*/
@MaybeNull
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.REVERSE_NULLABILITY)
private final String property;
/**
* Creates a new plugin to weave access controller dispatches without
* a property to allow for disabling the access controller handling.
*/
public AccessControllerPlugin() {
this(null);
}
/**
* Creates a new plugin to weave access controller dispatches.
*
* @param property The property to control if the access controller should be used even
* if available or {@code null} if such a property should not be available.
*/
@UsingReflection.Priority(Integer.MAX_VALUE)
public AccessControllerPlugin(@MaybeNull String property) {
super(declaresMethod(isAnnotatedWith(Enhance.class)));
this.property = property;
}
/**
* {@inheritDoc}
*/
public Plugin make() {
return this;
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "SBSC_USE_STRINGBUFFER_CONCATENATION", justification = "Collision is unlikely and buffer overhead not justified.")
public DynamicType.Builder apply(DynamicType.Builder builder, TypeDescription typeDescription, ClassFileLocator classFileLocator) {
String name = NAME;
while (!typeDescription.getDeclaredFields().filter(named(name)).isEmpty()) {
name += "$";
}
return builder
.defineField(name, boolean.class, Visibility.PRIVATE, Ownership.STATIC, FieldManifestation.FINAL)
.visit(new AsmVisitorWrapper.ForDeclaredMethods().method(isAnnotatedWith(Enhance.class), new AccessControlWrapper(name)))
.initializer(property == null
? new Initializer.WithoutProperty(typeDescription, name)
: new Initializer.WithProperty(typeDescription, name, property));
}
/**
* {@inheritDoc}
*/
public void close() {
/* do nothing */
}
/**
* A byte code appender to create an initializer segment that determines if
* the {@code java.security.AccessController} is available.
*/
@HashCodeAndEqualsPlugin.Enhance
protected abstract static class Initializer implements ByteCodeAppender {
/**
* The instrumented type.
*/
private final TypeDescription instrumentedType;
/**
* The name of the field to determine the use of access controller dispatch.
*/
private final String name;
/**
* Creates a new initializer.
*
* @param instrumentedType The instrumented type.
* @param name The name of the field to determine the use of access controller dispatch.
*/
protected Initializer(TypeDescription instrumentedType, String name) {
this.instrumentedType = instrumentedType;
this.name = name;
}
/**
* {@inheritDoc}
*/
public Size apply(MethodVisitor methodVisitor, Implementation.Context implementationContext, MethodDescription instrumentedMethod) {
Label start = new Label(), end = new Label(), classNotFound = new Label(), securityException = new Label(), complete = new Label();
methodVisitor.visitTryCatchBlock(start, end, classNotFound, Type.getInternalName(ClassNotFoundException.class));
methodVisitor.visitTryCatchBlock(start, end, securityException, Type.getInternalName(SecurityException.class));
methodVisitor.visitLabel(start);
methodVisitor.visitLdcInsn(ACCESS_CONTROLLER);
methodVisitor.visitInsn(Opcodes.ICONST_0);
methodVisitor.visitInsn(Opcodes.ACONST_NULL);
methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC,
Type.getInternalName(Class.class),
"forName",
Type.getMethodDescriptor(Type.getType(Class.class),
Type.getType(String.class),
Type.getType(boolean.class),
Type.getType(ClassLoader.class)),
false);
methodVisitor.visitInsn(Opcodes.POP);
int size = onAccessController(methodVisitor);
methodVisitor.visitFieldInsn(Opcodes.PUTSTATIC, instrumentedType.getInternalName(), name, Type.getDescriptor(boolean.class));
methodVisitor.visitLabel(end);
methodVisitor.visitJumpInsn(Opcodes.GOTO, complete);
methodVisitor.visitLabel(classNotFound);
implementationContext.getFrameGeneration().same1(methodVisitor,
TypeDescription.ForLoadedType.of(ClassNotFoundException.class),
Collections.emptyList());
methodVisitor.visitInsn(Opcodes.POP);
methodVisitor.visitInsn(Opcodes.ICONST_0);
methodVisitor.visitFieldInsn(Opcodes.PUTSTATIC, instrumentedType.getInternalName(), name, Type.getDescriptor(boolean.class));
methodVisitor.visitJumpInsn(Opcodes.GOTO, complete);
methodVisitor.visitLabel(securityException);
implementationContext.getFrameGeneration().same1(methodVisitor,
TypeDescription.ForLoadedType.of(SecurityException.class),
Collections.emptyList());
methodVisitor.visitInsn(Opcodes.POP);
methodVisitor.visitInsn(Opcodes.ICONST_1);
methodVisitor.visitFieldInsn(Opcodes.PUTSTATIC, instrumentedType.getInternalName(), name, Type.getDescriptor(boolean.class));
methodVisitor.visitLabel(complete);
implementationContext.getFrameGeneration().same(methodVisitor, Collections.emptyList());
return new Size(Math.max(3, size), 0);
}
/**
* Invoked to determine if the access controller should be used after the class was found.
*
* @param methodVisitor The method visitor to dispatch to.
* @return The size of the stack required to implement the implemented dispatch.
*/
protected abstract int onAccessController(MethodVisitor methodVisitor);
/**
* An initializer that uses a property to determine if the access controller should be actually used even if it is available.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class WithProperty extends Initializer {
/**
* The name of the property.
*/
private final String property;
/**
* Creates an initializer that uses a property to determine if the access controller should be actually used even if it is available.
*
* @param instrumentedType The instrumented type.
* @param name The name of the field to determine the use of access controller dispatch.
* @param property The name of the property.
*/
protected WithProperty(TypeDescription instrumentedType, String name, String property) {
super(instrumentedType, name);
this.property = property;
}
@Override
protected int onAccessController(MethodVisitor methodVisitor) {
methodVisitor.visitLdcInsn(property);
methodVisitor.visitLdcInsn("true");
methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC,
Type.getInternalName(System.class),
"getProperty",
Type.getMethodDescriptor(Type.getType(String.class), Type.getType(String.class), Type.getType(String.class)),
false);
methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC,
Type.getInternalName(Boolean.class),
"parseBoolean",
Type.getMethodDescriptor(Type.getType(boolean.class), Type.getType(String.class)),
false);
return 2;
}
}
/**
* An initializer that always uses the access controller if it is available.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class WithoutProperty extends Initializer {
/**
* Creates an initializer that always uses the access controller if it is available.
*
* @param instrumentedType The instrumented type.
* @param name The name of the field to determine the use of access controller dispatch.
*/
protected WithoutProperty(TypeDescription instrumentedType, String name) {
super(instrumentedType, name);
}
@Override
protected int onAccessController(MethodVisitor methodVisitor) {
methodVisitor.visitInsn(Opcodes.ICONST_1);
return 1;
}
}
}
/**
* An wrapper for a method that represents a method of {@code AccessController} which is weaved.
*/
@HashCodeAndEqualsPlugin.Enhance
protected static class AccessControlWrapper implements AsmVisitorWrapper.ForDeclaredMethods.MethodVisitorWrapper {
/**
* The name of the field.
*/
private final String name;
/**
* Creates a new access control wrapper.
*
* @param name The name of the field.
*/
protected AccessControlWrapper(String name) {
this.name = name;
}
/**
* {@inheritDoc}
*/
public MethodVisitor wrap(TypeDescription instrumentedType,
MethodDescription instrumentedMethod,
MethodVisitor methodVisitor,
Implementation.Context implementationContext,
TypePool typePool,
int writerFlags,
int readerFlags) {
MethodDescription.SignatureToken token = SIGNATURES.get(instrumentedMethod.asDefined().asSignatureToken());
if (token == null) {
throw new IllegalStateException(instrumentedMethod + " does not have a method with a matching signature in " + ACCESS_CONTROLLER);
} else if (instrumentedMethod.isPublic() || instrumentedMethod.isProtected()) {
throw new IllegalStateException(instrumentedMethod + " is either public or protected what is not permitted to avoid context leaks");
}
return new PrefixingMethodVisitor(methodVisitor,
instrumentedType,
token,
name,
instrumentedMethod.isStatic() ? 0 : 1,
implementationContext.getFrameGeneration());
}
/**
* A method visitor to implement a weaved method to dispatch to an {@code java.security.AccessController}, if available.
*/
protected static class PrefixingMethodVisitor extends MethodVisitor {
/**
* The instrumented type.
*/
private final TypeDescription instrumentedType;
/**
* The target signature of the method declared by the JVM access controller.
*/
private final MethodDescription.SignatureToken token;
/**
* The name of the field.
*/
private final String name;
/**
* The base offset of the weaved method.
*/
private final int offset;
/**
* Indicates the frame generation mode to apply.
*/
private final Implementation.Context.FrameGeneration frameGeneration;
/**
* Creates a new prefixing method visitor.
*
* @param methodVisitor The method visitor to write to.
* @param instrumentedType The instrumented type.
* @param token The target signature of the method declared by the JVM access controller.
* @param name The name of the field.
* @param offset The base offset of the instrumented method.
* @param frameGeneration Indicates the frame generation mode to apply.
*/
protected PrefixingMethodVisitor(MethodVisitor methodVisitor,
TypeDescription instrumentedType,
MethodDescription.SignatureToken token,
String name,
int offset,
Implementation.Context.FrameGeneration frameGeneration) {
super(OpenedClassReader.ASM_API, methodVisitor);
this.instrumentedType = instrumentedType;
this.token = token;
this.name = name;
this.offset = offset;
this.frameGeneration = frameGeneration;
}
@Override
public void visitCode() {
mv.visitCode();
mv.visitFieldInsn(Opcodes.GETSTATIC, instrumentedType.getInternalName(), name, Type.getDescriptor(boolean.class));
Label label = new Label();
mv.visitJumpInsn(Opcodes.IFEQ, label);
int offset = this.offset;
for (TypeDescription typeDescription : token.getParameterTypes()) {
mv.visitVarInsn(Type.getType(typeDescription.getDescriptor()).getOpcode(Opcodes.ILOAD), offset);
if (typeDescription.equals(JavaType.ACCESS_CONTROL_CONTEXT.getTypeStub())) {
mv.visitTypeInsn(Opcodes.CHECKCAST, typeDescription.getInternalName());
}
offset += typeDescription.getStackSize().getSize();
}
mv.visitMethodInsn(Opcodes.INVOKESTATIC,
ACCESS_CONTROLLER.replace('.', '/'),
token.getName(),
token.getDescriptor(),
false);
mv.visitInsn(Type.getType(token.getReturnType().getDescriptor()).getOpcode(Opcodes.IRETURN));
mv.visitLabel(label);
frameGeneration.same(mv, token.getParameterTypes());
}
@Override
public void visitMaxs(int stackSize, int localVariableLength) {
mv.visitMaxs(Math.max(Math.max(StackSize.of(token.getParameterTypes()),
token.getReturnType().getStackSize().getSize()), stackSize), localVariableLength);
}
}
}
/**
* Indicates that the annotated method represents a pseudo implementation of {@code java.security.AccessController}
* which can be weaved to dispatch to the access controller if this is possible on the current VM and not explicitly
* disabled on the current VM via a system property.
*/
@Documented
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Enhance {
/* empty */
}
}
