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// Copyright 2021 Code Intelligence GmbH
//
// 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 com.code_intelligence.jazzer.sanitizers
import com.code_intelligence.jazzer.api.FuzzerSecurityIssueHigh
import com.code_intelligence.jazzer.api.HookType
import com.code_intelligence.jazzer.api.Jazzer
import com.code_intelligence.jazzer.api.MethodHook
import com.code_intelligence.jazzer.api.MethodHooks
import java.lang.invoke.MethodHandle
/**
* Detects unsafe calls that lead to attacker-controlled class loading.
*
* Guide the fuzzer to load honeypot class via [Class.forName] or [ClassLoader.loadClass].
*/
@Suppress("unused_parameter", "unused")
object ReflectiveCall {
@MethodHooks(
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Class", targetMethod = "forName", targetMethodDescriptor = "(Ljava/lang/String;)Ljava/lang/Class;"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Class", targetMethod = "forName", targetMethodDescriptor = "(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.ClassLoader", targetMethod = "loadClass", targetMethodDescriptor = "(Ljava/lang/String;)Ljava/lang/Class;"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.ClassLoader", targetMethod = "loadClass", targetMethodDescriptor = "(Ljava/lang/String;Z)Ljava/lang/Class;"),
)
@JvmStatic
fun loadClassHook(method: MethodHandle?, alwaysNull: Any?, args: Array<Any?>, hookId: Int) {
val className = args[0] as? String ?: return
Jazzer.guideTowardsEquality(className, HONEYPOT_CLASS_NAME, hookId)
}
@MethodHooks(
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Class", targetMethod = "forName", targetMethodDescriptor = "(Ljava/lang/Module;Ljava/lang/String;)Ljava/lang/Class;"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.ClassLoader", targetMethod = "loadClass", targetMethodDescriptor = "(Ljava/lang/Module;Ljava/lang/String;)Ljava/lang/Class;"),
)
@JvmStatic
fun loadClassWithModuleHook(method: MethodHandle?, alwaysNull: Any?, args: Array<Any?>, hookId: Int) {
val className = args[1] as? String ?: return
Jazzer.guideTowardsEquality(className, HONEYPOT_CLASS_NAME, hookId)
}
@MethodHooks(
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Runtime", targetMethod = "load"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.Runtime", targetMethod = "loadLibrary"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.System", targetMethod = "load"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.System", targetMethod = "loadLibrary"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.System", targetMethod = "mapLibraryName"),
MethodHook(type = HookType.BEFORE, targetClassName = "java.lang.ClassLoader", targetMethod = "findLibrary"),
)
@JvmStatic
fun loadLibraryHook(method: MethodHandle?, alwaysNull: Any?, args: Array<Any?>, hookId: Int) {
if (args.isEmpty()) { return }
val libraryName = args[0] as? String ?: return
if (libraryName == HONEYPOT_LIBRARY_NAME) {
Jazzer.reportFindingFromHook(
FuzzerSecurityIssueHigh("load arbitrary library"),
)
}
Jazzer.guideTowardsEquality(libraryName, HONEYPOT_LIBRARY_NAME, hookId)
}
}
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