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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2019 Guardsquare NV
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.obfuscate;
import proguard.*;
import proguard.classfile.*;
import proguard.classfile.attribute.visitor.*;
import proguard.classfile.constant.visitor.*;
import proguard.classfile.editor.*;
import proguard.classfile.kotlin.*;
import proguard.classfile.kotlin.asserter.KotlinMetadataAsserter;
import proguard.classfile.kotlin.fixer.*;
import proguard.classfile.kotlin.obfuscate.*;
import proguard.classfile.kotlin.visitors.*;
import proguard.classfile.kotlin.visitors.filter.*;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
import proguard.util.*;
import java.io.*;
import java.util.*;
/**
* This class can perform obfuscation of class pools according to a given
* specification.
*
* @author Eric Lafortune
*/
public class Obfuscator
{
private final Configuration configuration;
/**
* Creates a new Obfuscator.
*/
public Obfuscator(Configuration configuration)
{
this.configuration = configuration;
}
/**
* Performs obfuscation of the given program class pool.
*/
public void execute(ClassPool programClassPool,
ClassPool libraryClassPool) throws IOException
{
// Check if we have at least some keep commands.
if (configuration.keep == null &&
configuration.applyMapping == null &&
configuration.printMapping == null)
{
throw new IOException("You have to specify '-keep' options for the obfuscation step.");
}
// We're using the system's default character encoding for writing to
// the standard output and error output.
PrintWriter out = new PrintWriter(System.out, true);
PrintWriter err = new PrintWriter(System.err, true);
// Clean up any old visitor info.
programClassPool.classesAccept(new ClassCleaner());
libraryClassPool.classesAccept(new ClassCleaner());
// Link all non-private, non-static methods in all class hierarchies.
ClassVisitor memberInfoLinker =
new BottomClassFilter(new MethodLinker());
programClassPool.classesAccept(memberInfoLinker);
libraryClassPool.classesAccept(memberInfoLinker);
// If the class member names have to correspond globally,
// additionally link all class members in all program classes.
if (configuration.useUniqueClassMemberNames)
{
programClassPool.classesAccept(new AllMemberVisitor(
new MethodLinker()));
}
// Create a visitor for marking the seeds.
NameMarker nameMarker = new NameMarker();
// All library classes and library class members keep their names.
libraryClassPool.classesAccept(nameMarker);
libraryClassPool.classesAccept(new AllMemberVisitor(nameMarker));
// Mark classes that have the DONT_OBFUSCATE flag set.
programClassPool.classesAccept(
new MultiClassVisitor(
new ClassProcessingFlagFilter(ProcessingFlags.DONT_OBFUSCATE, 0,
nameMarker),
new AllMemberVisitor(
new MemberProcessingFlagFilter(ProcessingFlags.DONT_OBFUSCATE, 0,
nameMarker))));
// We also keep the names of the abstract methods of functional
// interfaces referenced from bootstrap method arguments (additional
// interfaces with LambdaMetafactory.altMetafactory).
// The functional method names have to match the names in the
// dynamic method invocations with LambdaMetafactory.
programClassPool.classesAccept(
new ClassVersionFilter(ClassConstants.CLASS_VERSION_1_7,
new AllAttributeVisitor(
new AttributeNameFilter(ClassConstants.ATTR_BootstrapMethods,
new AllBootstrapMethodInfoVisitor(
new AllBootstrapMethodArgumentVisitor(
new ConstantTagFilter(ClassConstants.CONSTANT_Class,
new ReferencedClassVisitor(
new FunctionalInterfaceFilter(
new ClassHierarchyTraveler(true, false, true, false,
new AllMethodVisitor(
new MemberAccessFilter(ClassConstants.ACC_ABSTRACT, 0,
nameMarker))))))))))));
// We also keep the names of the abstract methods of functional
// interfaces that are returned by dynamic method invocations.
// The functional method names have to match the names in the
// dynamic method invocations with LambdaMetafactory.
programClassPool.classesAccept(
new ClassVersionFilter(ClassConstants.CLASS_VERSION_1_7,
new AllConstantVisitor(
new DynamicReturnedClassVisitor(
new FunctionalInterfaceFilter(
new ClassHierarchyTraveler(true, false, true, false,
new AllMethodVisitor(
new MemberAccessFilter(ClassConstants.ACC_ABSTRACT, 0,
nameMarker))))))));
if (configuration.adaptKotlinMetadata)
{
programClassPool.classesAccept(
// Keep Kotlin default implementations class where the user had already kept the interface.
new ClassProcessingFlagFilter(ProcessingFlags.DONT_OBFUSCATE, 0,
new ReferencedKotlinMetadataVisitor(new KotlinInterfaceToDefaultImplsClassVisitor(nameMarker))));
}
// Mark attributes that have to be kept.
AttributeVisitor attributeUsageMarker =
new NonEmptyAttributeFilter(
new AttributeUsageMarker());
AttributeVisitor optionalAttributeUsageMarker =
configuration.keepAttributes == null ? null :
new AttributeNameFilter(configuration.keepAttributes,
attributeUsageMarker);
programClassPool.classesAccept(
new AllAttributeVisitor(true,
new RequiredAttributeFilter(attributeUsageMarker,
optionalAttributeUsageMarker)));
// Keep parameter names and types if specified.
if (configuration.keepParameterNames)
{
programClassPool.classesAccept(
new AllMethodVisitor(
new MemberNameFilter(
new AllAttributeVisitor(true,
new ParameterNameMarker(attributeUsageMarker)))));
if (configuration.adaptKotlinMetadata)
{
programClassPool.classesAccept(
new ReferencedKotlinMetadataVisitor(
new KotlinValueParameterUsageMarker()));
}
}
if (configuration.adaptKotlinMetadata)
{
programClassPool.classesAccept(
new ReferencedKotlinMetadataVisitor(
new AllValueParameterVisitor(
new KotlinValueParameterNameShrinker())));
// Keep SourceDebugExtension annotations on Kotlin synthetic classes but obfuscate them.
programClassPool.classesAccept(
new ReferencedKotlinMetadataVisitor(
new KotlinSyntheticClassKindFilter(
KotlinSyntheticClassKindFilter::isLambda,
new KotlinMetadataToClazzVisitor(
new AllAttributeVisitor(
new AttributeNameFilter(ClassConstants.ATTR_SourceDebugExtension,
new MultiAttributeVisitor(attributeUsageMarker,
new SourceDebugExtensionAttributeObfuscator())))))));
}
// Remove the attributes that can be discarded. Note that the attributes
// may only be discarded after the seeds have been marked, since the
// configuration may rely on annotations.
programClassPool.classesAccept(new AttributeShrinker());
// Apply the mapping, if one has been specified. The mapping can
// override the names of library classes and of library class members.
if (configuration.applyMapping != null)
{
if (configuration.verbose)
{
out.println("Applying mapping from [" +
PrintWriterUtil.fileName(configuration.applyMapping) +
"]...");
}
WarningPrinter warningPrinter = new WarningPrinter(err, configuration.warn);
MappingReader reader = new MappingReader(configuration.applyMapping);
MappingProcessor keeper =
new MultiMappingProcessor(new MappingProcessor[]
{
new MappingKeeper(programClassPool, warningPrinter),
new MappingKeeper(libraryClassPool, null),
});
reader.pump(keeper);
// Print out a summary of the warnings if necessary.
int warningCount = warningPrinter.getWarningCount();
if (warningCount > 0)
{
err.println("Warning: there were " + warningCount +
" kept classes and class members that were remapped anyway.");
err.println(" You should adapt your configuration or edit the mapping file.");
if (!configuration.ignoreWarnings)
{
err.println(" If you are sure this remapping won't hurt,");
err.println(" you could try your luck using the '-ignorewarnings' option.");
}
err.println(" (http://proguard.sourceforge.net/manual/troubleshooting.html#mappingconflict1)");
if (!configuration.ignoreWarnings)
{
throw new IOException("Please correct the above warnings first.");
}
}
}
// Come up with new names for all classes.
DictionaryNameFactory classNameFactory = configuration.classObfuscationDictionary != null ?
new DictionaryNameFactory(configuration.classObfuscationDictionary, null) :
null;
DictionaryNameFactory packageNameFactory = configuration.packageObfuscationDictionary != null ?
new DictionaryNameFactory(configuration.packageObfuscationDictionary, null) :
null;
programClassPool.classesAccept(
new ClassObfuscator(programClassPool,
libraryClassPool,
classNameFactory,
packageNameFactory,
configuration.useMixedCaseClassNames,
configuration.keepPackageNames,
configuration.flattenPackageHierarchy,
configuration.repackageClasses,
configuration.allowAccessModification,
configuration.adaptKotlinMetadata));
// Come up with new names for all class members.
NameFactory nameFactory = new SimpleNameFactory();
if (configuration.obfuscationDictionary != null)
{
nameFactory =
new DictionaryNameFactory(configuration.obfuscationDictionary,
nameFactory);
}
WarningPrinter warningPrinter = new WarningPrinter(err, configuration.warn);
// Maintain a map of names to avoid [descriptor - new name - old name].
Map descriptorMap = new HashMap();
// Do the class member names have to be globally unique?
if (configuration.useUniqueClassMemberNames)
{
// Collect all member names in all classes.
programClassPool.classesAccept(
new AllMemberVisitor(
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)));
// Assign new names to all members in all classes.
programClassPool.classesAccept(
new AllMemberVisitor(
new MemberObfuscator(configuration.overloadAggressively,
nameFactory,
descriptorMap)));
}
else
{
// Come up with new names for all non-private class members.
programClassPool.classesAccept(
new MultiClassVisitor(
// Collect all private member names in this class and down
// the hierarchy.
new ClassHierarchyTraveler(true, false, false, true,
new AllMemberVisitor(
new MemberAccessFilter(ClassConstants.ACC_PRIVATE, 0,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Collect all non-private member names anywhere in the
// hierarchy.
new ClassHierarchyTraveler(true, true, true, true,
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Assign new names to all non-private members in this class.
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberObfuscator(configuration.overloadAggressively,
nameFactory,
descriptorMap))),
// Clear the collected names.
new MapCleaner(descriptorMap)
));
// Come up with new names for all private class members.
programClassPool.classesAccept(
new MultiClassVisitor(
// Collect all member names in this class.
new AllMemberVisitor(
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)),
// Collect all non-private member names higher up the hierarchy.
new ClassHierarchyTraveler(false, true, true, false,
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Collect all member names from interfaces of abstract
// classes down the hierarchy.
// Due to an error in the JLS/JVMS, virtual invocations
// may end up at a private method otherwise (Sun/Oracle
// bugs #6691741 and #6684387, ProGuard bug #3471941,
// and ProGuard test #1180).
new ClassHierarchyTraveler(false, false, false, true,
new ClassAccessFilter(ClassConstants.ACC_ABSTRACT, 0,
new ClassHierarchyTraveler(false, false, true, false,
new AllMemberVisitor(
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap))))),
// Collect all default method names from interfaces of
// any classes down the hierarchy.
// This is an extended version of the above problem
// (Sun/Oracle bug #802464, ProGuard bug #662, and
// ProGuard test #2060).
new ClassHierarchyTraveler(false, false, false, true,
new ClassHierarchyTraveler(false, false, true, false,
new AllMethodVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_ABSTRACT | ClassConstants.ACC_STATIC,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap))))),
// Assign new names to all private members in this class.
new AllMemberVisitor(
new MemberAccessFilter(ClassConstants.ACC_PRIVATE, 0,
new MemberObfuscator(configuration.overloadAggressively,
nameFactory,
descriptorMap))),
// Clear the collected names.
new MapCleaner(descriptorMap)
));
}
// Some class members may have ended up with conflicting names.
// Come up with new, globally unique names for them.
NameFactory specialNameFactory =
new SpecialNameFactory(new SimpleNameFactory());
// Collect a map of special names to avoid
// [descriptor - new name - old name].
Map specialDescriptorMap = new HashMap();
programClassPool.classesAccept(
new AllMemberVisitor(
new MemberSpecialNameFilter(
new MemberNameCollector(configuration.overloadAggressively,
specialDescriptorMap))));
libraryClassPool.classesAccept(
new AllMemberVisitor(
new MemberSpecialNameFilter(
new MemberNameCollector(configuration.overloadAggressively,
specialDescriptorMap))));
// Replace conflicting non-private member names with special names.
programClassPool.classesAccept(
new MultiClassVisitor(
// Collect all private member names in this class and down
// the hierarchy.
new ClassHierarchyTraveler(true, false, false, true,
new AllMemberVisitor(
new MemberAccessFilter(ClassConstants.ACC_PRIVATE, 0,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Collect all non-private member names in this class and
// higher up the hierarchy.
new ClassHierarchyTraveler(true, true, true, false,
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Assign new names to all conflicting non-private members
// in this class and higher up the hierarchy.
new ClassHierarchyTraveler(true, true, true, false,
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberNameConflictFixer(configuration.overloadAggressively,
descriptorMap,
warningPrinter,
new MemberObfuscator(configuration.overloadAggressively,
specialNameFactory,
specialDescriptorMap))))),
// Clear the collected names.
new MapCleaner(descriptorMap)
));
// Replace conflicting private member names with special names.
// This is only possible if those names were kept or mapped.
programClassPool.classesAccept(
new MultiClassVisitor(
// Collect all member names in this class.
new AllMemberVisitor(
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)),
// Collect all non-private member names higher up the hierarchy.
new ClassHierarchyTraveler(false, true, true, false,
new AllMemberVisitor(
new MemberAccessFilter(0, ClassConstants.ACC_PRIVATE,
new MemberNameCollector(configuration.overloadAggressively,
descriptorMap)))),
// Assign new names to all conflicting private members in this
// class.
new AllMemberVisitor(
new MemberAccessFilter(ClassConstants.ACC_PRIVATE, 0,
new MemberNameConflictFixer(configuration.overloadAggressively,
descriptorMap,
warningPrinter,
new MemberObfuscator(configuration.overloadAggressively,
specialNameFactory,
specialDescriptorMap)))),
// Clear the collected names.
new MapCleaner(descriptorMap)
));
// Print out any warnings about member name conflicts.
int warningCount = warningPrinter.getWarningCount();
if (warningCount > 0)
{
err.println("Warning: there were " + warningCount +
" conflicting class member name mappings.");
err.println(" Your configuration may be inconsistent.");
if (!configuration.ignoreWarnings)
{
err.println(" If you are sure the conflicts are harmless,");
err.println(" you could try your luck using the '-ignorewarnings' option.");
}
err.println(" (http://proguard.sourceforge.net/manual/troubleshooting.html#mappingconflict2)");
if (!configuration.ignoreWarnings)
{
throw new IOException("Please correct the above warnings first.");
}
}
if (configuration.adaptKotlinMetadata)
{
programClassPool.classesAccept(
new MultiClassVisitor(
// Obfuscate the Intrinsics.check* method calls.
new InstructionSequenceObfuscator(
new IntrinsicsReplacementSequences(programClassPool, libraryClassPool)),
new ReferencedKotlinMetadataVisitor(
new MultiKotlinMetadataVisitor(
// Come up with new names for Kotlin Properties.
new KotlinPropertyNameObfuscator(nameFactory),
// Obfuscate alias names.
new KotlinAliasNameObfuscator(nameFactory),
// Ensure companion classes have $CompanionName suffix.
new KotlinCompanionEqualizer(),
// Equalise/fix $DefaultImpls and $WhenMappings classes.
new KotlinSyntheticClassFixer(),
new AllFunctionsVisitor(
// Ensure that all default interface implementations of methods have the same names.
new KotlinDefaultImplsMethodNameEqualizer(),
// Ensure all $default methods match their counterpart but with a $default suffix.
new KotlinDefaultMethodNameEqualizer(),
// Obfuscate the throw new UnsupportedOperationExceptions in $default methods
// because they contain the original function name in the string.
new KotlinFunctionToDefaultMethodVisitor(
new InstructionSequenceObfuscator(
new UnsupportedExceptionReplacementSequences(programClassPool, libraryClassPool)))
),
// Obfuscate toString methods in data classes.
new KotlinClassKindFilter(
kc -> kc.flags.isData,
new KotlinDataClassObfuscator())
))));
}
// Print out the mapping, if requested.
if (configuration.printMapping != null)
{
if (configuration.verbose)
{
out.println("Printing mapping to [" +
PrintWriterUtil.fileName(configuration.printMapping) +
"]...");
}
PrintWriter mappingWriter =
PrintWriterUtil.createPrintWriter(configuration.printMapping, out);
try
{
// Print out items that will be renamed.
programClassPool.classesAcceptAlphabetically(
new MappingPrinter(mappingWriter));
}
finally
{
PrintWriterUtil.closePrintWriter(configuration.printMapping,
mappingWriter);
}
}
if (configuration.addConfigurationDebugging)
{
programClassPool.classesAccept(new RenamedFlagSetter());
}
// // Apply new names to @Metadata of Kotlin classes first,
// // because it contains deep references to classes and members.
// programClassPool.classesAccept(new AllAttributeVisitor(
// new AttributeNameFilter(ClassConstants.ATTR_RuntimeVisibleAnnotations,
// new AllAnnotationVisitor(
// new AnnotationTypeFilter(ClassConstants.TYPE_KOTLIN_METADATA,
// new KotlinMetadataFixer(programClassPool,
// libraryClassPool,
// configuration.keepParameterNames))))));
// Actually apply the new names.
programClassPool.classesAccept(new ClassRenamer());
libraryClassPool.classesAccept(new ClassRenamer());
if (configuration.adaptKotlinMetadata)
{
// Apply new names to Kotlin properties.
programClassPool.classesAccept(
new ReferencedKotlinMetadataVisitor(
new AllKotlinPropertiesVisitor(
new KotlinPropertyRenamer())));
}
// Update all references to these new names.
programClassPool.classesAccept(new ClassReferenceFixer(false));
libraryClassPool.classesAccept(new ClassReferenceFixer(false));
programClassPool.classesAccept(new MemberReferenceFixer(configuration.android));
if (configuration.adaptKotlinMetadata)
{
programClassPool.classesAccept(
new ReferencedKotlinMetadataVisitor(
new AllTypeVisitor(
new KotlinAliasReferenceFixer())));
if (configuration.enableKotlinAsserter)
{
ClassVisitor kotlinAsserter =
new ReferencedKotlinMetadataVisitor(
new KotlinMetadataAsserter(programClassPool, libraryClassPool, warningPrinter));
programClassPool.classesAccept(kotlinAsserter);
libraryClassPool.classesAccept(kotlinAsserter);
}
}
// Make package visible elements public or protected, if obfuscated
// classes are being repackaged aggressively.
if (configuration.repackageClasses != null &&
configuration.allowAccessModification)
{
programClassPool.classesAccept(
new AccessFixer());
// Fix the access flags of the inner classes information.
programClassPool.classesAccept(
new AllAttributeVisitor(
new AllInnerClassesInfoVisitor(
new InnerClassesAccessFixer())));
}
// Fix the bridge method flags.
programClassPool.classesAccept(
new AllMethodVisitor(
new BridgeMethodFixer()));
// Rename the source file attributes, if requested.
if (configuration.newSourceFileAttribute != null)
{
programClassPool.classesAccept(new SourceFileRenamer(configuration.newSourceFileAttribute));
}
// Remove unused constants.
programClassPool.classesAccept(
new ConstantPoolShrinker());
}
}
