novice/plugin-privacy
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1.Do not hook Class.forName as it will affect the use of other plugins and may become a detection method.

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2.The plugin itself needs to be excluded from being actively loaded.
3.Reducing the date check to 30 days (<60 days) can allow some common registration codes to pass the detection.
This commit is contained in:
haochuliu
2024-04-20 12:48:17 +08:00
parent 459fb45a61
commit 2fe0791b46
6 changed files with 25 additions and 55 deletions
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37
src/main/java/com/novitechie/ClassTransformer.java
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@@ -1,37 +0,0 @@
package com.novitechie;
import com.janetfilter.core.plugin.MyTransformer;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.tree.*;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
/**
* @author YeloChick
*/
public class ClassTransformer implements MyTransformer {
@Override
public String getHookClassName() {
return "java.lang.Class";
}
@Override
public byte[] transform(String className, byte[] classBytes, int order) throws Exception {
ClassReader reader = new ClassReader(classBytes);
ClassNode node = new ClassNode(ASM5);
reader.accept(node, 0);
for (MethodNode m : node.methods) {
if ("forName".equals(m.name)) {
InsnList list = new InsnList();
list.add(new VarInsnNode(ALOAD, 0));
list.add(new MethodInsnNode(INVOKESTATIC, "com/novitechie/LoadClassRule", "check", "(Ljava/lang/String;)V", false));
m.instructions.insert(list);
}
}
ClassWriter writer = new SafeClassWriter(null, null, ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
node.accept(writer);
return writer.toByteArray();
}
}

20
src/main/java/com/novitechie/LoadClassRule.java
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@@ -1,14 +1,22 @@
package com.novitechie;
import java.util.ArrayList;
import java.util.List;
public class LoadClassRule {
private static final List<String> PREVENT_LOAD_PACKAGES = new ArrayList<String>() {
{
add("com.novitechie");
add("com.janetfilter");
add("jdk.internal.org.objectweb.asm");
}
};
public static void check(String name) throws Exception {
if (name.startsWith("com.janetfilter")) {
if (PREVENT_LOAD_PACKAGES.stream().anyMatch(name::startsWith)) {
throw new ClassNotFoundException(name);
}
if (name.contains("jdk.internal.org.objectweb.asm.Type")) {
if (StackTraceRule.check()) {
throw new ClassNotFoundException(name);
}
}
}
}

3
src/main/java/com/novitechie/PrivacyPlugin.java
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@@ -23,7 +23,6 @@ public class PrivacyPlugin implements PluginEntry {
new VMOptionsTransformer(),
new PluginClassLoaderTransformer(),
new LicensingFacadeTransformer(),
new PluginManagerCoreTransformer(),
new ClassTransformer());
new PluginManagerCoreTransformer());
}
}

14
src/main/java/com/novitechie/SafeClassWriter.java
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@@ -29,13 +29,13 @@
package com.novitechie;
import java.io.IOException;
import java.io.InputStream;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.Opcodes;
import java.io.IOException;
import java.io.InputStream;
/**
@@ -146,13 +146,13 @@ public class SafeClassWriter extends ClassWriter {
throws IOException {
while (!"java/lang/Object".equals(type)) {
String[] itfs = info.getInterfaces();
for (int i = 0; i < itfs.length; ++i) {
if (itfs[i].equals(itf)) {
for (String s : itfs) {
if (s.equals(itf)) {
return true;
}
}
for (int i = 0; i < itfs.length; ++i) {
if (typeImplements(itfs[i], typeInfo(itfs[i]), itf)) {
for (String s : itfs) {
if (typeImplements(s, typeInfo(s), itf)) {
return true;
}
}

2
src/main/java/com/novitechie/StackTraceRule.java
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@@ -23,7 +23,7 @@ public class StackTraceRule {
for (StackTraceElement stackTraceElement : stackTrace) {
if (!PACKAGE_NAME_PATTERN.matcher(stackTraceElement.getMethodName()).matches()) {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DAY_OF_MONTH, 180);
calendar.add(Calendar.DAY_OF_MONTH, 30);
return calendar.getTime();
}
}

4
src/main/java/com/novitechie/VMOptionsTransformer.java
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@@ -1,8 +1,8 @@
package com.novitechie;
import com.janetfilter.core.plugin.MyTransformer;
import jdk.internal.org.objectweb.asm.*;
import jdk.internal.org.objectweb.asm.commons.AdviceAdapter;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.tree.*;
import static jdk.internal.org.objectweb.asm.Opcodes.*;