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/*
* Copyright (C) 2014 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 static com.android.SdkConstants.ANDROID_URI;
import static com.android.SdkConstants.ATTR_NAME;
import static com.android.SdkConstants.ATTR_PACKAGE;
import static com.android.SdkConstants.TAG_ACTIVITY;
import static com.android.tools.lint.client.api.JavaParser.TYPE_STRING;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.tools.lint.client.api.JavaParser.ResolvedClass;
import com.android.tools.lint.client.api.JavaParser.ResolvedMethod;
import com.android.tools.lint.detector.api.Category;
import com.android.tools.lint.detector.api.Detector;
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.android.tools.lint.detector.api.Speed;
import com.android.tools.lint.detector.api.XmlContext;
import org.w3c.dom.Element;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import lombok.ast.ClassDeclaration;
import lombok.ast.Node;
/**
* Ensures that PreferenceActivity and its subclasses are never exported.
*/
public class PreferenceActivityDetector extends Detector
implements Detector.XmlScanner, Detector.JavaScanner {
public static final Issue ISSUE = Issue.create(
"ExportedPreferenceActivity", //$NON-NLS-1$
"PreferenceActivity should not be exported",
"Fragment injection gives anyone who can send your PreferenceActivity an intent the "
+ "ability to load any fragment, with any arguments, in your process.",
Category.SECURITY,
8,
Severity.WARNING,
new Implementation(
PreferenceActivityDetector.class,
EnumSet.of(Scope.MANIFEST, Scope.JAVA_FILE)))
.addMoreInfo("http://securityintelligence.com/"
+ "new-vulnerability-android-framework-fragment-injection");
private static final String PREFERENCE_ACTIVITY = "android.preference.PreferenceActivity"; //$NON-NLS-1$
private static final String IS_VALID_FRAGMENT = "isValidFragment"; //$NON-NLS-1$
private final Map mExportedActivities =
new HashMap();
@NonNull
@Override
public Speed getSpeed() {
return Speed.FAST;
}
// ---- Implements XmlScanner ----
@Override
public Collection getApplicableElements() {
return Collections.singletonList(TAG_ACTIVITY);
}
@Override
public void visitElement(@NonNull XmlContext context, @NonNull Element element) {
if (SecurityDetector.getExported(element)) {
String fqcn = getFqcn(element);
if (fqcn != null) {
if (fqcn.equals(PREFERENCE_ACTIVITY) &&
!context.getDriver().isSuppressed(context, ISSUE, element)) {
String message = "`PreferenceActivity` should not be exported";
context.report(ISSUE, context.getLocation(element), message);
}
mExportedActivities.put(fqcn, context.createLocationHandle(element));
}
}
}
private static String getFqcn(@NonNull Element activityElement) {
String activityClassName = activityElement.getAttributeNS(ANDROID_URI, ATTR_NAME);
if (activityClassName == null || activityClassName.isEmpty()) {
return null;
}
// If the activity class name starts with a '.', it is shorthand for prepending the
// package name specified in the manifest.
if (activityClassName.startsWith(".")) {
String pkg = activityElement.getOwnerDocument().getDocumentElement()
.getAttribute(ATTR_PACKAGE);
if (pkg != null) {
return pkg + activityClassName;
} else {
return null;
}
}
return activityClassName;
}
// ---- Implements JavaScanner ----
@Nullable
@Override
public List applicableSuperClasses() {
return Collections.singletonList(PREFERENCE_ACTIVITY);
}
@Override
public void checkClass(@NonNull JavaContext context, @Nullable ClassDeclaration node,
@NonNull Node declarationOrAnonymous, @NonNull ResolvedClass resolvedClass) {
if (!context.getProject().getReportIssues()) {
return;
}
String className = resolvedClass.getName();
if (resolvedClass.isSubclassOf(PREFERENCE_ACTIVITY, false)
&& mExportedActivities.containsKey(className)) {
// Ignore the issue if we target an API greater than 19 and the class in
// question specifically overrides isValidFragment() and thus knowingly white-lists
// valid fragments.
if (context.getMainProject().getTargetSdk() >= 19
&& overridesIsValidFragment(resolvedClass)) {
return;
}
String message = String.format(
"`PreferenceActivity` subclass `%1$s` should not be exported",
className);
context.report(ISSUE, mExportedActivities.get(className).resolve(), message);
}
}
private static boolean overridesIsValidFragment(ResolvedClass resolvedClass) {
Iterable resolvedMethods = resolvedClass.getMethods(IS_VALID_FRAGMENT,
false);
for (ResolvedMethod resolvedMethod : resolvedMethods) {
if (resolvedMethod.getArgumentCount() == 1
&& resolvedMethod.getArgumentType(0).getName().equals(TYPE_STRING)) {
return true;
}
}
return false;
}
}
