private boolean readClass(String clazz) throws IOException {
ClassReader cr = new ClassReader(new FileInputStream(clazz));
ClassNode ca =
new ClassNode() {
public void visitEnd() {
// accept(cv);
}
};
cr.accept(new CheckClassAdapter(ca), true);
boolean failed = false;
List methods = ca.methods;
for (int i = 0; i < methods.size(); ++i) {
MethodNode method = (MethodNode) methods.get(i);
if (method.instructions.size() > 0) {
Analyzer a = new Analyzer(new SimpleVerifier());
try {
a.analyze(ca.name, method);
continue;
} catch (Exception e) {
e.printStackTrace();
}
final Frame[] frames = a.getFrames();
if (!failed) {
failed = true;
log("verifying of class " + clazz + " failed");
}
if (verbose) log(method.name + method.desc);
TraceMethodVisitor cv =
new TraceMethodVisitor(null) {
public void visitMaxs(int maxStack, int maxLocals) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < text.size(); ++i) {
String s = frames[i] == null ? "null" : frames[i].toString();
while (s.length() < maxStack + maxLocals + 1) {
s += " ";
}
buffer.append(Integer.toString(i + 100000).substring(1));
buffer.append(" ");
buffer.append(s);
buffer.append(" : ");
buffer.append(text.get(i));
}
if (verbose) log(buffer.toString());
}
};
for (int j = 0; j < method.instructions.size(); ++j) {
Object insn = method.instructions.get(j);
if (insn instanceof AbstractInsnNode) {
((AbstractInsnNode) insn).accept(cv);
} else {
cv.visitLabel((Label) insn);
}
}
cv.visitMaxs(method.maxStack, method.maxLocals);
}
}
return !failed;
}
@Override
public void checkCall(
@NonNull ClassContext context,
@NonNull ClassNode classNode,
@NonNull MethodNode method,
@NonNull MethodInsnNode call) {
String owner = call.owner;
String desc = call.desc;
if (owner.equals(OWNER_SECURE_RANDOM)) {
if (desc.startsWith(LONG_ARG)) {
checkValidSetSeed(context, call);
} else if (desc.startsWith("([B)")) { // $NON-NLS-1$
// setSeed(byte[]) ...
// We could do some flow analysis here to see whether the byte array getting
// passed in appears to be fixed.
// However, people calling this constructor rather than the simpler one
// with a fixed integer are probably less likely to make that mistake... right?
}
} else if (owner.equals(OWNER_RANDOM) && desc.startsWith(LONG_ARG)) {
// Called setSeed(long) on an instanceof a Random object. Flag this if the instance
// is likely a SecureRandom.
// Track allocations such that we know whether the type of the call
// is on a SecureRandom rather than a Random
Analyzer analyzer =
new Analyzer(
new BasicInterpreter() {
@Override
public BasicValue newValue(Type type) {
if (type != null && type.getDescriptor().equals(VM_SECURE_RANDOM)) {
return new BasicValue(type);
}
return super.newValue(type);
}
});
try {
Frame[] frames = analyzer.analyze(classNode.name, method);
InsnList instructions = method.instructions;
Frame frame = frames[instructions.indexOf(call)];
int stackSlot = frame.getStackSize();
for (Type type : Type.getArgumentTypes(desc)) {
stackSlot -= type.getSize();
}
BasicValue stackValue = (BasicValue) frame.getStack(stackSlot);
Type type = stackValue.getType();
if (type != null && type.getDescriptor().equals(VM_SECURE_RANDOM)) {
checkValidSetSeed(context, call);
}
} catch (AnalyzerException e) {
context.log(e, null);
}
} else if (owner.equals(OWNER_RANDOM) && desc.startsWith(LONG_ARG)) {
// Called setSeed(long) on an instanceof a Random object. Flag this if the instance
// is likely a SecureRandom.
// TODO
}
}
public void visitEnd() {
MethodNode mn = (MethodNode) mv;
Analyzer<BasicValue> a = new Analyzer<BasicValue>(new BasicVerifier());
try {
a.analyze(owner, mn);
} catch (AnalyzerException e) {
throw new RuntimeException(e.getMessage());
}
mn.accept(next);
}