private List<Unit> instrumentIntentAddings(
BiDiInterproceduralCFG<Unit, SootMethod> cfg,
Unit unit,
InvokeExpr sinkExpr,
Set<ResultSourceInfo> sourceInfo) {
if (isMethodInterComponentSink(sinkExpr.getMethod())) {
SootMethod method = cfg.getMethodOf(unit);
Body body = null;
if (method.hasActiveBody()) body = method.retrieveActiveBody();
else throw new RuntimeException("No body found!");
Set<String> sourceCategories = getDataIdList(sourceInfo);
final String hashSetType = "java.util.HashSet";
List<Unit> generated = new ArrayList<Unit>();
// HashSet initialization
Local hashSetLocal = generateFreshLocal(body, RefType.v(hashSetType));
NewExpr newExpr = Jimple.v().newNewExpr(RefType.v(hashSetType));
AssignStmt assignStmt = Jimple.v().newAssignStmt(hashSetLocal, newExpr);
generated.add(assignStmt);
// constructor call
SpecialInvokeExpr constructorCall =
Jimple.v()
.newSpecialInvokeExpr(
hashSetLocal,
Scene.v().getMethod("<java.util.HashSet: void <init>()>").makeRef());
InvokeStmt constructorCallStmt = Jimple.v().newInvokeStmt(constructorCall);
generated.add(constructorCallStmt);
// add categories to HashSet
for (String cat : sourceCategories) {
InterfaceInvokeExpr addCall =
Jimple.v()
.newInterfaceInvokeExpr(
hashSetLocal,
Scene.v().getMethod("<java.util.Set: boolean add(java.lang.Object)>").makeRef(),
StringConstant.v(cat));
InvokeStmt addCallStmt = Jimple.v().newInvokeStmt(addCall);
generated.add(addCallStmt);
}
// get Intent
Value intent = sinkExpr.getArg(0);
List<Object> args = new ArrayList<Object>();
args.add(RefType.v("android.content.Intent"));
args.add(intent);
args.add(RefType.v(hashSetType));
args.add(hashSetLocal);
StaticInvokeExpr sie =
Instrumentation.createJimpleStaticInvokeExpr(
Settings.INSTRUMENTATION_HELPER_JAVA, "addTaintInformationToIntent", args);
InvokeStmt invStmt = Jimple.v().newInvokeStmt(sie);
generated.add(invStmt);
return generated;
}
return Collections.emptyList();
}
private boolean isInterComponentSourceCallback(
ResultSourceInfo si, BiDiInterproceduralCFG<Unit, SootMethod> cfg) {
if (isSourceInfoParameter(si)) {
SootMethod sm = cfg.getMethodOf(si.getSource());
if (entryPointCreator.getCallbackFunctions().containsKey(sm.getDeclaringClass())) {
if (entryPointCreator
.getCallbackFunctions()
.get(sm.getDeclaringClass())
.contains(sm.getSignature())) return true;
}
}
return false;
}
/**
* @param cfg
* @param sink
* @param assignmentStatement
*/
private void instrumentSourceToSinkConnections(
BiDiInterproceduralCFG<Unit, SootMethod> cfg,
ResultSinkInfo sink,
boolean assignmentStatement) {
sourceSinkConnectionCounter += 1;
// loop through the sinks
for (ResultSinkInfo key : results.getResults().keySet()) {
log.debug("compare: " + key);
log.debug(" to: " + sink);
// if the current sink is the sink at the unit tagged with 'sink'
if (key.equals(sink)) {
// loop through the sources
for (ResultSourceInfo si : results.getResults().get(key)) {
Stmt stmt = si.getSource();
SootMethod sm = cfg.getMethodOf(stmt);
Body body = sm.retrieveActiveBody();
// Source instrumentation. The three type categories for the source are:
// - callback
// - ICC source method (i.e., Intent.getExtras())
// - not a callback and not an ICC source method (i.e., getLine1Number())
//
if (isInterComponentSourceCallback(si, cfg)) {
throw new RuntimeException("Callbacks as sources are not supported right now");
} else if (isInterComponentSourceNoCallback(si, cfg)) {
// only invoke expression are treated here
if (stmt.containsInvokeExpr()) {
// only statements that return a android.os.Bundle are currently supported
if (stmt instanceof DefinitionStmt) {
DefinitionStmt defStmt = (DefinitionStmt) stmt;
Value leftValue = defStmt.getLeftOp();
if (leftValue.getType().equals(RefType.v("android.os.Bundle"))) {
List<Object> args = new ArrayList<Object>();
args.add(IntType.v());
args.add(IntConstant.v(sourceSinkConnectionCounter));
args.add(RefType.v("android.os.Bundle"));
args.add(leftValue);
InvokeExpr invExpr =
Instrumentation.createJimpleStaticInvokeExpr(
Settings.INSTRUMENTATION_HELPER_JAVA,
"registerNewSourceSinkConnection",
args);
InvokeStmt invStmt = Jimple.v().newInvokeStmt(invExpr);
Unit instrumentationPoint = null;
if (stmt instanceof IdentityStmt) {
instrumentationPoint = getLastIdentityStmt(body);
} else {
instrumentationPoint = stmt;
}
body.getUnits().insertAfter(invStmt, instrumentationPoint);
log.debug("insert a: " + invStmt);
} else {
System.err.println("We do only support android.os.Bundle right now!");
}
}
}
} else {
String sourceCat = getSourceCategory(si);
if (sourceCat != null) {
List<Object> args = new ArrayList<Object>();
args.add(IntType.v());
args.add(IntConstant.v(sourceSinkConnectionCounter));
args.add(RefType.v("java.lang.String"));
args.add(StringConstant.v(sourceCat));
InvokeExpr invExpr =
Instrumentation.createJimpleStaticInvokeExpr(
Settings.INSTRUMENTATION_HELPER_JAVA,
"registerNewSourceSinkConnection",
args);
InvokeStmt invStmt = Jimple.v().newInvokeStmt(invExpr);
Unit instrumentationPoint = null;
if (stmt instanceof IdentityStmt) instrumentationPoint = getLastIdentityStmt(body);
else instrumentationPoint = stmt;
body.getUnits().insertAfter(invStmt, instrumentationPoint);
log.debug("insert b: " + invStmt);
}
}
// sink instrumentation
if (sink.getSink().containsInvokeExpr()) {
Body bodyOfSink = cfg.getMethodOf(key.getSink()).getActiveBody();
InvokeExpr invExpr = sink.getSink().getInvokeExpr();
List<Unit> generated = new ArrayList<Unit>();
generated.addAll(
instrumentIntentAddings(cfg, stmt, invExpr, results.getResults().get(key)));
EventInformation sinkEventInfo =
allEventInformation.get(invExpr.getMethod().getSignature());
EventInformation sourceEventInfo =
allEventInformation.get(si.getSource().getInvokeExpr().getMethod().getSignature());
generated.addAll(
generatePolicyEnforcementPoint(
key.getSink(),
invExpr,
bodyOfSink,
sourceSinkConnectionCounter,
assignmentStatement));
log.debug("body with data flow:\n" + body);
for (Unit u : generated) {
log.debug("gen: " + u);
}
if (sinkEventInfo.isInstrumentAfterStatement())
bodyOfSink.getUnits().insertAfter(generated, key.getSink());
else bodyOfSink.getUnits().insertBefore(generated, key.getSink());
} else throw new RuntimeException("Double-Check the assumption");
} // loop through the sources
} // if the sink at the unit is the current sink
} // loop through the sinks
}
