Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.tools.lint.checks;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.tools.lint.client.api.JavaEvaluator;
import com.android.tools.lint.detector.api.Category;
import com.android.tools.lint.detector.api.ClassContext;
import com.android.tools.lint.detector.api.Detector;
import com.android.tools.lint.detector.api.Detector.ClassScanner;
import com.android.tools.lint.detector.api.Detector.JavaPsiScanner;
import com.android.tools.lint.detector.api.Implementation;
import com.android.tools.lint.detector.api.Issue;
import com.android.tools.lint.detector.api.JavaContext;
import com.android.tools.lint.detector.api.Location;
import com.android.tools.lint.detector.api.Scope;
import com.android.tools.lint.detector.api.Severity;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiCodeBlock;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiReturnStatement;
import com.intellij.psi.PsiStatement;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.MethodNode;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
public class TrustAllX509TrustManagerDetector extends Detector implements JavaPsiScanner,
ClassScanner {
@SuppressWarnings("unchecked")
private static final Implementation IMPLEMENTATION =
new Implementation(TrustAllX509TrustManagerDetector.class,
EnumSet.of(Scope.JAVA_LIBRARIES, Scope.JAVA_FILE),
Scope.JAVA_FILE_SCOPE);
public static final Issue ISSUE = Issue.create("TrustAllX509TrustManager",
"Insecure TLS/SSL trust manager",
"This check looks for X509TrustManager implementations whose `checkServerTrusted` or " +
"`checkClientTrusted` methods do nothing (thus trusting any certificate chain) " +
"which could result in insecure network traffic caused by trusting arbitrary " +
"TLS/SSL certificates presented by peers.",
Category.SECURITY,
6,
Severity.WARNING,
IMPLEMENTATION);
public TrustAllX509TrustManagerDetector() {
}
// ---- Implements JavaScanner ----
@Nullable
@Override
public List applicableSuperClasses() {
return Collections.singletonList("javax.net.ssl.X509TrustManager");
}
@Override
public void checkClass(@NonNull JavaContext context, @NonNull PsiClass cls) {
checkMethod(context, cls, "checkServerTrusted");
checkMethod(context, cls, "checkClientTrusted");
}
private static void checkMethod(@NonNull JavaContext context,
@NonNull PsiClass cls,
@NonNull String methodName) {
JavaEvaluator evaluator = context.getEvaluator();
for (PsiMethod method : cls.findMethodsByName(methodName, true)) {
if (evaluator.isAbstract(method)) {
continue;
}
// For now very simple; only checks if nothing is done.
// Future work: Improve this check to be less sensitive to irrelevant
// instructions/statements/invocations (e.g. System.out.println) by
// looking for calls that could lead to a CertificateException being
// thrown, e.g. throw statement within the method itself or invocation
// of another method that may throw a CertificateException, and only
// reporting an issue if none of these calls are found. ControlFlowGraph
// may be useful here.
boolean complex = false;
PsiCodeBlock body = method.getBody();
if (body == null) {
return;
}
for (PsiStatement statement : body.getStatements()) {
if (!(statement instanceof PsiReturnStatement)) {
complex = true;
break;
}
}
if (!complex) {
Location location = context.getNameLocation(method);
String message = getErrorMessage(methodName);
context.report(ISSUE, method, location, message);
}
}
}
@NonNull
private static String getErrorMessage(String methodName) {
return "`" + methodName + "` is empty, which could cause " +
"insecure network traffic due to trusting arbitrary TLS/SSL " +
"certificates presented by peers";
}
// ---- Implements ClassScanner ----
// Only used for libraries where we have to analyze bytecode
@Override
@SuppressWarnings("rawtypes")
public void checkClass(@NonNull final ClassContext context,
@NonNull ClassNode classNode) {
if (!context.isFromClassLibrary()) {
// Non-library code checked at the AST level
return;
}
if (!classNode.interfaces.contains("javax/net/ssl/X509TrustManager")) {
return;
}
List methodList = classNode.methods;
for (Object m : methodList) {
MethodNode method = (MethodNode) m;
if ("checkServerTrusted".equals(method.name) ||
"checkClientTrusted".equals(method.name)) {
InsnList nodes = method.instructions;
boolean emptyMethod = true; // Stays true if method doesn't perform any "real"
// operations
for (int i = 0, n = nodes.size(); i < n; i++) {
// Future work: Improve this check to be less sensitive to irrelevant
// instructions/statements/invocations (e.g. System.out.println) by
// looking for calls that could lead to a CertificateException being
// thrown, e.g. throw statement within the method itself or invocation
// of another method that may throw a CertificateException, and only
// reporting an issue if none of these calls are found. ControlFlowGraph
// may be useful here.
AbstractInsnNode instruction = nodes.get(i);
int type = instruction.getType();
if (type != AbstractInsnNode.LABEL && type != AbstractInsnNode.LINE &&
!(type == AbstractInsnNode.INSN &&
instruction.getOpcode() == Opcodes.RETURN)) {
emptyMethod = false;
break;
}
}
if (emptyMethod) {
Location location = context.getLocation(method, classNode);
context.report(ISSUE, location, getErrorMessage(method.name));
}
}
}
}
}
