谷歌应用引擎JRE类“黑名单”

他们似乎采取了更多的白名单方式: http://code.google.com/appengine/docs/java/jrewhitelist.html .

这里还有关于沙盒(它可以访问哪些文件等)的更多详细信息: http://code.google.com/appengine/docs/java/runtime.html#The_Sandbox

这些限制看起来非常直观(比如受限制的文件系统访问,没有jni等等)。

我不知道黑名单,但以下链接可能会有帮助: http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine

我在google的i/o上得到了一张广告卡:

LTech AppEngine Compatibility Analyzer

听起来可能对你有用。我没有试过,如果你试过,请回来评论。谢谢!

我在gae项目中使用了servlet,但是它不在白名单中,即使它可以正常工作。实际上,google提到了如何使用servlet,但它不在白名单中

导入javax.servlet.http.*;

这里提到:

http://code.google.com/appengine/docs/java/runtime.html

但此处不包括:

http://code.google.com/appengine/docs/java/jrewhitelist.html

我喜欢gae(因为免费配额),但是文档很混乱。

我使用intellij,当导入不在白名单中时,它会标记为错误。但是,可以禁用它。

当我遇到这个查询时,我正在寻找一些东西,所以我想分享gae(google app engine)黑白列表上的详细信息,这样任何人都可以正确地解决这个问题。细节:

appengine-agentruntime.jar文件 有两个实例变量:

private static Agent agent      
private static Set<String> blackList

我们从探员那里得到黑名单= AppEngineDevAgent.getAgent() . 所以如果我们检查一下 b)appengine-agent.jar文件 我们可以找到探员 Class<?> implClass = agentImplLoader.loadClass("com.google.appengine.tools.development.agent.impl.AgentImpl");

然后转到agentimpl类。 c)appengine-agentimpl.jar文件 我们可以 请参阅使用静态初始化在类加载时填充黑名单变量&它引用白名单以筛选允许的类。

static {
            initBlackList();
        }

    public static Set<String> getBlackList() {
        return blackList;
    }

    private static boolean isBlackListed(String className) {
        Set<String> whiteList = WhiteList.getWhiteList();
        return (!whiteList.contains(className))
                && (!className.startsWith("com.sun.xml.internal.bind."));
    }

终于可以检查了 d)appengine-tools-sdk-1.8.3.jar文件 所有白名单类的列表。

结论: 作为一个黑客,为了使用任何不属于这个白名单的jre类,需要使用白名单或黑名单。 . 如果你取消 appengine-agentruntime.jar文件 库注释拒绝方法的内容为

public static void reject(String className) {
    /*throw new NoClassDefFoundError(className + " is a restricted class. Please see the Google " + " App Engine developer's guide for more details.");*/
  }

然后再把它用在你的项目中,希望能有所帮助。

————————————————————————————————————————————————————————---

a) appengine-agentruntime.jar文件 :-它包含实际的 运行时 引发异常的类(从 拒绝 方法)对于不属于上述白名单的类。

package com.google.appengine.tools.development.agent.runtime;

import com.google.appengine.tools.development.agent.AppEngineDevAgent;
import com.google.appengine.tools.development.agent.impl.Agent;
import com.google.apphosting.utils.clearcast.ClearCast;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT

public class Runtime {

    private static Agent agent = (Agent) ClearCast.cast(
            AppEngineDevAgent.getAgent(), Agent.class);

    private static Set<String> blackList = agent.getBlackList();

    public static ClassLoader checkParentClassLoader(ClassLoader loader) {
        ClassLoader systemLoader = ClassLoader.getSystemClassLoader();
        return (loader != null) && (loader != systemLoader) ? loader
                : Runtime.class.getClassLoader();
    }

    public static void recordClassLoader(ClassLoader loader) {
        agent.recordAppClassLoader(loader);
    }

    public static void reject(String className) {
        throw new NoClassDefFoundError(className
                + " is a restricted class. Please see the Google "
                + " App Engine developer's guide for more details.");
    }

    private static boolean isBlackListed(Class klass) {
        String className = klass.getName().replace('.', '/');
        return blackList.contains(className);
    }

    // REMOVED OTHER METHODS TO KEEP IT SHORT
}

b) appengine-agent.jar文件 -

package com.google.appengine.tools.development.agent;

import com.google.apphosting.utils.clearcast.ClearCast;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT

public class AppEngineDevAgent {
    private static final String AGENT_IMPL = "com.google.appengine.tools.development.agent.impl.AgentImpl";
    private static final String AGENT_IMPL_JAR = "appengine-agentimpl.jar";
    private static final Logger logger = Logger.getLogger(AppEngineDevAgent.class.getName());
    private static Object impl;

    public static void premain(String agentArgs, Instrumentation inst) {
        URL agentImplLib = findAgentImplLib();
        URLClassLoader agentImplLoader = new URLClassLoader(
                new URL[] { agentImplLib }) {
            protected PermissionCollection getPermissions(CodeSource codesource) {
                PermissionCollection perms = super.getPermissions(codesource);
                perms.add(new AllPermission());
                return perms;
            }
        };
        try {
            Class<?> implClass = agentImplLoader
                    .loadClass("com.google.appengine.tools.development.agent.impl.AgentImpl");
            impl = ((AgentImplStruct) ClearCast.staticCast(implClass,
                    AgentImplStruct.class)).getInstance();
            AgentImplStruct agentImplStruct = (AgentImplStruct) ClearCast.cast(
                    impl, AgentImplStruct.class);
            agentImplStruct.run(inst);
        } catch (Exception e) {
            logger.log(
                    Level.SEVERE,
                    "Unable to load the App Engine dev agent. Security restrictions will not be completely emulated.",
                    e);
        }
    }

    public static Object getAgent() {
        return impl;
    }

    //REMOVED OTHER METHODS TO KEEP IT SHORT
}

c) appengine-agentimpl.jar文件 -

package com.google.appengine.tools.development.agent.impl;

import com.google.apphosting.runtime.security.WhiteList;
//REMOVED OTHER IMPORTS TO KEEP IT SHORT

public class BlackList {
    private static final Logger logger = Logger.getLogger(BlackList.class.getName());
    private static Set<String> blackList = new HashSet();

    static {
        initBlackList();
    }

    public static Set<String> getBlackList() {
        return blackList;
    }

    private static boolean isBlackListed(String className) {
        Set<String> whiteList = WhiteList.getWhiteList();
        return (!whiteList.contains(className))
                && (!className.startsWith("com.sun.xml.internal.bind."));
    }

    private static void initBlackList() {
        Set<File> jreJars = getCurrentJreJars();
        for (File f : jreJars) {
            JarFile jarFile = null;
            try {
                jarFile = new JarFile(f);
            } catch (IOException e) {
                logger.log(
                        Level.SEVERE,
                        "Unable to read a jre library while constructing the blacklist. Security restrictions may not be entirely emulated. "
                                + f.getAbsolutePath());
            }
            continue;

            Enumeration<JarEntry> entries = jarFile.entries();
            while (entries.hasMoreElements()) {
                JarEntry entry = (JarEntry) entries.nextElement();
                String entryName = entry.getName();
                if (entryName.endsWith(".class")) {
                    String className = entryName.replace('/', '.').substring(0,
                            entryName.length() - ".class".length());
                    if (isBlackListed(className)) {
                        blackList.add(className.replace('.', '/'));
                    }
                }
            }
        }
        blackList = Collections.unmodifiableSet(blackList);
    }

    private static Set<File> getCurrentJreJars() {
        return getJreJars(System.getProperty("java.home"));
    }

    //REMOVED OTHER METHODS TO KEEP IT SHORT
}

d) appengine-tools-sdk-1.8.3.jar文件 :-它有一个名为 白名单 包括所有允许的JRE类。

package com.google.apphosting.runtime.security;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class WhiteList {
    private static Set<String> whiteList = new HashSet(
            Arrays.asList(new String[] {
                    "java.beans.Transient",
                    "java.lang.BootstrapMethodError",
                    "java.lang.Character$UnicodeScript",
                    "java.lang.ClassValue",
                    "java.lang.SafeVarargs",

                    //Removed other classes to keep this article short

                    "java.net.URLClassLoader",
                    "java.security.SecureClassLoader",
                    "sun.net.spi.nameservice.NameService" }));

    public static Set<String> getWhiteList() {
        return whiteList;
    }
}