Chapter 8: JVM

Makefile

@@ -1,4 +1,4 @@
-all: killer-whiles who-you-gonna-call
+all: killer-whiles who-you-gonna-call jvm
 
 killer-whiles:
 	(cd examples/killer-whiles && make)
@@ -7,6 +7,9 @@ who-you-gonna-call:
 	(cd examples/who-you-gonna-call && make)
 	(cd examples/who-you-gonna-call/src && make gen && make)
 
+jvm:
+	(cd examples/jvm && make)
+
 clean:
 	rm -rf vm/vm.zip vm/parts.sha256 vm/chaos-engineering-VM*
 

examples/jvm/Makefile

@@ -0,0 +1,75 @@
+CFLAGS=-O0
+
+all: FizzBuzzEnterpriseEdition/bin/FizzBuzzEnterpriseEdition byteman-download-4.0.11 byte-monkey.jar
+
+src:
+	git clone https://github.com/EnterpriseQualityCoding/FizzBuzzEnterpriseEdition.git src
+
+byteman-download-4.0.11:
+	wget https://downloads.jboss.org/byteman/4.0.11/byteman-download-4.0.11-bin.zip
+	unzip byteman-download-4.0.11-bin.zip
+	rm byteman-download-4.0.11-bin.zip
+
+byte-monkey.jar:
+	wget https://github.com/mrwilson/byte-monkey/releases/download/1.0.0/byte-monkey.jar
+
+FizzBuzzEnterpriseEdition/bin/FizzBuzzEnterpriseEdition: src
+	(cd src && ./gradlew assemble && ./gradlew build)
+	unzip src/build/distributions/FizzBuzzEnterpriseEdition.zip
+
+run:
+	./FizzBuzzEnterpriseEdition/bin/FizzBuzzEnterpriseEdition
+
+run2:
+	java -classpath "./FizzBuzzEnterpriseEdition/lib/*" com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+run3:
+	javap -classpath "./FizzBuzzEnterpriseEdition/lib/*" -c com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+run4:
+	java -javaagent:./agent1.jar -classpath "./FizzBuzzEnterpriseEdition/lib/*" com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+run5:
+	java -javaagent:./agent2.jar -classpath "./FizzBuzzEnterpriseEdition/lib/*" com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+run6:
+	java \
+		-javaagent:./byteman-download-4.0.11/lib/byteman.jar=script:throw.btm \
+		-classpath "./FizzBuzzEnterpriseEdition/lib/*" \
+		com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+run7:
+	java \
+		-javaagent:byte-monkey.jar=mode:fault,rate:0.5,filter:com/seriouscompany/business/java/fizzbuzz/packagenamingpackage/impl/strategies/SystemOutFizzBuzzOutputStrategy/output \
+		-classpath "./FizzBuzzEnterpriseEdition/lib/*" \
+		com.seriouscompany.business.java.fizzbuzz.packagenamingpackage.impl.Main
+
+
+
+example1-compile:
+	javac ./org/my/example1.java
+example1-run:
+	java org.my.Example1
+example1-bytecode:
+	javap -c org.my.Example1
+example1-agent:
+	java -javaagent:./agent1.jar org.my.Example1
+
+example2-compile:
+	javac ./org/my/example2.java
+example2-run:
+	java org.my.Example2
+example2-bytecode:
+	javap -c org.my.Example2
+
+.PHONY: run run2 run3 example1-compile example1-run example1-bytecode example2-compile example2-run example2-bytecode
+
+agent1.jar: org/agent/Agent.java org/agent/ClassPrinter.java org/agent/manifest.mf
+	javac org/agent/Agent.java
+	javac org/agent/ClassPrinter.java
+	jar vcmf org/agent/manifest.mf agent1.jar org/agent
+
+agent2.jar: org/agent2/Agent.java org/agent2/ClassInjector.java org/agent2/manifest.mf
+	javac -XDignore.symbol.file org/agent2/Agent.java
+	javac -XDignore.symbol.file org/agent2/ClassInjector.java
+	jar vcmf org/agent2/manifest.mf agent2.jar org/agent2

examples/jvm/org/agent/Agent.java

@@ -0,0 +1,10 @@
+package org.agent;
+
+import java.lang.instrument.Instrumentation;
+
+class Agent {
+  public static void premain(String args, Instrumentation instrumentation){
+    ClassPrinter transformer = new ClassPrinter();
+    instrumentation.addTransformer(transformer);
+  }
+}

examples/jvm/org/agent/ClassPrinter.java

@@ -0,0 +1,17 @@
+package org.agent;
+
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+
+class ClassPrinter implements ClassFileTransformer {
+    public byte[] transform(ClassLoader loader,
+                            String className,
+                            Class<?> classBeingRedefined,
+                            ProtectionDomain protectionDomain,
+                            byte[] classfileBuffer) throws IllegalClassFormatException {
+    System.out.println("Found class: " + className + " (" + classfileBuffer.length + " bytes)");
+    return classfileBuffer;
+  }
+}

examples/jvm/org/agent/manifest.mf

@@ -0,0 +1,2 @@
+Manifest-Version: 1.0
+Premain-Class: org.agent.Agent

examples/jvm/org/agent2/Agent.java

@@ -0,0 +1,10 @@
+package org.agent2;
+
+import java.lang.instrument.Instrumentation;
+
+class Agent {
+  public static void premain(String args, Instrumentation instrumentation){
+    ClassInjector transformer = new ClassInjector();
+    instrumentation.addTransformer(transformer);
+  }
+}

examples/jvm/org/agent2/ClassInjector.java

@@ -0,0 +1,59 @@
+package org.agent2;
+
+import java.io.IOException;
+import java.util.List;
+
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+import jdk.internal.org.objectweb.asm.ClassReader;
+import jdk.internal.org.objectweb.asm.ClassWriter;
+import jdk.internal.org.objectweb.asm.tree.*;
+import jdk.internal.org.objectweb.asm.Opcodes;
+
+
+public class ClassInjector implements ClassFileTransformer {
+
+    public String targetClassName = "com/seriouscompany/business/java/fizzbuzz/packagenamingpackage/impl/strategies/SystemOutFizzBuzzOutputStrategy";
+
+    public byte[] transform(ClassLoader loader,
+                            String className,
+                            Class<?> classBeingRedefined,
+                            ProtectionDomain protectionDomain,
+                            byte[] classfileBuffer) throws IllegalClassFormatException {
+    if (className.equals(this.targetClassName)){
+      System.err.println("[CHAOS] TARGET ACQUIRED: " + className + " (" + classfileBuffer.length + " bytes)");
+
+      ClassNode classNode = new ClassNode();
+      new ClassReader(classfileBuffer).accept(classNode, 0);
+      classNode.methods.stream()
+        .filter(method -> method.name.equals("output"))
+        .forEach(method -> {
+          InsnList instructions = new InsnList();
+          instructions.add(new MethodInsnNode(
+              Opcodes.INVOKESTATIC,
+              "org/agent2/ClassInjector",
+              "throwIOException",
+              "()V",
+              false // not a method
+          ));
+          method.maxStack += 1;
+          method.instructions.insertBefore(method.instructions.getFirst(), instructions);
+          System.err.println("[CHAOS] Method " + method.name + " modified");
+        });
+        final ClassWriter classWriter = new ClassWriter(0);
+        classNode.accept(classWriter);
+        byte[] bytes = classWriter.toByteArray();
+        System.err.println("[CHAOS] Rewrote: " + className + " (" + bytes.length + " bytes)");
+        return bytes;
+    }
+    return classfileBuffer;
+  }
+
+  public static void throwIOException() throws IOException
+  {
+      System.err.println("[CHAOS] BOOM! Throwing");
+      throw new IOException("CHAOS");
+  }
+}

examples/jvm/org/agent2/manifest.mf

@@ -0,0 +1,4 @@
+Manifest-Version: 1.0
+Premain-Class: org.agent2.Agent
+Can-Redefine-Classes: true
+Can-Retransform-Classes: true

examples/jvm/org/my/example1.java

@@ -0,0 +1,9 @@
+package org.my;
+
+class Example1
+{
+    public static void main(String[] args)
+    {
+        System.out.println("Hello chaos!");
+    }
+}

examples/jvm/org/my/example2.java

@@ -0,0 +1,15 @@
+package org.my;
+import java.io.IOException;
+
+class Example2
+{
+    public static void main(String[] args) throws IOException
+    {
+        Example2.throwIOException();
+    }
+
+    public static void throwIOException() throws IOException
+    {
+        throw new IOException("Oops");
+    }
+}

examples/jvm/throw.btm

@@ -0,0 +1,9 @@
+RULE throw an exception at output
+CLASS SystemOutFizzBuzzOutputStrategy
+METHOD output
+AT ENTRY
+IF true
+DO
+  traceln("entering the method output");
+  throw new java.io.IOException("BOOM");
+ENDRULE

vm/ansible/prerequisites/defaults/main.yml

@@ -42,6 +42,8 @@ packages_to_install:
   - manpages-posix-dev
   # seccomp
   - libseccomp-dev
+  # java
+  - openjdk-8-jdk
 
 packages_to_remove:
   - libreoffice-core

vm/ansible/prerequisites/tasks/main.yml

@@ -199,3 +199,12 @@
   become: false
   shell: |
     gsettings set org.gnome.desktop.session idle-delay 0
+
+- name: Add auto-login
+  become: true
+  lineinfile:
+    path: /etc/gdm3/custom.conf
+    line: "{{ item }}"
+  loop:
+    - "AutomaticLoginEnable = true"
+    - "AutomaticLogin = chaos"