Java AccessControlContext類代碼示例

import java.security.AccessControlContext; //導入依賴的package包/類
final void checkPackageAccess(Class<?> cls, ProtectionDomain pd) {
    final SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
        if (ReflectUtil.isNonPublicProxyClass(cls)) {
            for (Class<?> intf: cls.getInterfaces()) {
                checkPackageAccess(intf, pd);
            }
            return;
        }

        final String name = cls.getName();
        final int i = name.lastIndexOf('.');
        if (i != -1) {
            AccessController.doPrivileged(new PrivilegedAction<Void>() {
                public Void run() {
                    sm.checkPackageAccess(name.substring(0, i));
                    return null;
                }
            }, new AccessControlContext(new ProtectionDomain[] {pd}));
        }
    }
    domains.add(pd);
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
void nativeQueueSurfaceDataRunnable(AppContext appContext,
                                    final Component c, final Runnable r)
{
    synchronized(this) {
        if (runnableList == null) {
            runnableList = new LinkedList<Runnable>();
        }
        runnableList.add(new Runnable() {
            public void run() {
                AccessControlContext stack = AccessController.getContext();
                AccessControlContext acc =
                    AWTAccessor.getComponentAccessor().getAccessControlContext(c);
                javaSecurityAccess.doIntersectionPrivilege(new PrivilegedAction<Void>() {
                    public Void run() {
                        r.run();
                        return null;
                    }
                }, stack, acc);
            }
        });
    }
    scheduleProcessingRunnable(appContext);
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
public CachedFile(File tempFile)
{
	this.tempFile = tempFile;

	final Permissions filePermissions = new Permissions();
	final FilePermission crudPermission = new FilePermission(tempFile.getAbsolutePath(), "read,write,delete");
	filePermissions.add(crudPermission);
	debug("filePermissions Added FilePermission for 'read', 'write', 'delete' on " + tempFile.getAbsolutePath());
	filePermissionContext = new AccessControlContext(new ProtectionDomain[]{new ProtectionDomain(null,
		filePermissions)});

	final Permissions openPermissions = new Permissions();
	openPermissions.add(crudPermission);
	debug("openPermissions Added FilePermission for 'read', 'write', 'delete' on " + tempFile.getAbsolutePath());
	openPermissions.add(new FilePermission("<<ALL FILES>>", "execute"));
	debug("openPermissions Added FilePermission for 'execute' on <<ALL FILES>>");
	openPermissions.add(new AWTPermission("showWindowWithoutWarningBanner"));
	debug("openPermissions Added AWTPermission for 'showWindowWithoutWarningBanner'");
	openPermissionContext = new AccessControlContext(new ProtectionDomain[]{new ProtectionDomain(null,
		openPermissions)});

	setAsSynced();
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * Retrieves the ServiceCreds for the specified server principal from
 * the Subject in the specified AccessControlContext. If not found, and if
 * useSubjectCredsOnly is false, then obtain from a LoginContext.
 *
 * NOTE: This method is also used by JSSE Kerberos Cipher Suites
 */
public static ServiceCreds getServiceCreds(GSSCaller caller,
    String serverPrincipal, AccessControlContext acc)
            throws LoginException {

    Subject accSubj = Subject.getSubject(acc);
    ServiceCreds sc = null;
    if (accSubj != null) {
        sc = ServiceCreds.getInstance(accSubj, serverPrincipal);
    }
    if (sc == null && !GSSUtil.useSubjectCredsOnly(caller)) {
        Subject subject = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
        sc = ServiceCreds.getInstance(subject, serverPrincipal);
    }
    return sc;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
public void actionPerformed(final ActionEvent e) {
    final Object src = e.getSource();

    final PrivilegedAction<Void> action = new PrivilegedAction<Void>() {
        public Void run() {
            actionPerformedImpl(e);
            return null;
        }
    };

    final AccessControlContext stack = AccessController.getContext();
    final AccessControlContext srcAcc = AWTAccessor.getComponentAccessor().getAccessControlContext((Component)src);
    final AccessControlContext eventAcc = AWTAccessor.getAWTEventAccessor().getAccessControlContext(e);

        if (srcAcc == null) {
            javaSecurityAccess.doIntersectionPrivilege(action, stack, eventAcc);
        } else {
            javaSecurityAccess.doIntersectionPrivilege(
                new PrivilegedAction<Void>() {
                    public Void run() {
                        javaSecurityAccess.doIntersectionPrivilege(action, eventAcc);
                        return null;
                     }
            }, stack, srcAcc);
        }
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * 清理來自URLClassLoader.acc.ProtectionDomain[]中，來自上一個ModuleClassLoader的ProtectionDomain
 * 這樣寫好蛋疼，而且還有不兼容的風險，從JDK6+都必須要這樣清理，但我找不出更好的辦法。
 * 在重置沙箱時，遇到MgrModule模塊無法正確卸載類的情況，主要的原因是在於URLClassLoader.acc.ProtectionDomain[]中包含了上一個ModuleClassLoader的引用
 * 所以必須要在這裏清理掉，否則隨著重置次數的增加，類會越累積越多
 */
private void cleanProtectionDomainWhichCameFromModuleClassLoader() {

    // got ProtectionDomain[] from URLClassLoader's acc
    final AccessControlContext acc = unCaughtGetClassDeclaredJavaFieldValue(URLClassLoader.class, "acc", this);
    final ProtectionDomain[] protectionDomainArray = unCaughtInvokeMethod(
            unCaughtGetClassDeclaredJavaMethod(AccessControlContext.class, "getContext"),
            acc
    );

    // remove ProtectionDomain which loader is ModuleClassLoader
    final Set<ProtectionDomain> cleanProtectionDomainSet = new LinkedHashSet<ProtectionDomain>();
    if (ArrayUtils.isNotEmpty(protectionDomainArray)) {
        for (final ProtectionDomain protectionDomain : protectionDomainArray) {
            if (protectionDomain.getClassLoader() == null
                    || !StringUtils.equals(ModuleClassLoader.class.getName(), protectionDomain.getClassLoader().getClass().getName())) {
                cleanProtectionDomainSet.add(protectionDomain);
            }
        }
    }

    // rewrite acc
    final AccessControlContext newAcc = new AccessControlContext(cleanProtectionDomainSet.toArray(new ProtectionDomain[]{}));
    unCaughtSetClassDeclaredJavaFieldValue(URLClassLoader.class, "acc", this, newAcc);

}
 

import java.security.AccessControlContext; //導入依賴的package包/類
private ClassLoader getClassLoader(final ObjectName name) {
    if(clr == null){
        return null;
    }
    // Restrict to getClassLoader permission only
    Permissions permissions = new Permissions();
    permissions.add(new MBeanPermission("*", null, name, "getClassLoader"));
    ProtectionDomain protectionDomain = new ProtectionDomain(null, permissions);
    ProtectionDomain[] domains = {protectionDomain};
    AccessControlContext ctx = new AccessControlContext(domains);
    ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        public ClassLoader run() {
            return clr.getClassLoader(name);
        }
    }, ctx);
    return loader;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
@Override
public Object postProcessBeforeInitialization(final Object bean, String beanName) throws BeansException {
	AccessControlContext acc = null;
	if (System.getSecurityManager() != null && (bean instanceof DisruptorEventPublisherAware )) {
		acc = getAccessControlContext();
	}
	if (acc != null) {
		AccessController.doPrivileged(new PrivilegedAction<Object>() {
			@Override
			public Object run() {
				invokeAwareInterfaces(bean);
				return null;
			}
		}, acc);
	}
	else {
		invokeAwareInterfaces(bean);
	}

	return bean;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * create a context that can read any directories (recursively)
 * mentioned in the class path. In the case of a jar, it has to
 * be the directory containing the jar, not just the jar, as jar
 * files might refer to other jar files.
 */

private static AccessControlContext getContext(File[] cp)
    throws MalformedURLException
{
    PathPermissions perms =
        new PathPermissions(cp);

    ProtectionDomain domain =
        new ProtectionDomain(new CodeSource(perms.getCodeBase(),
            (java.security.cert.Certificate[]) null),
        perms);

    AccessControlContext acc =
        new AccessControlContext(new ProtectionDomain[] { domain });

    return acc;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
@Override
public void run() {
    // Don't need to synchronize, as it only runs in one thread.
    for (Map.Entry<HandshakeCompletedListener,AccessControlContext>
        entry : targets) {

        final HandshakeCompletedListener l = entry.getKey();
        AccessControlContext acc = entry.getValue();
        AccessController.doPrivileged(new PrivilegedAction<Void>() {
            @Override
            public Void run() {
                l.handshakeCompleted(event);
                return null;
            }
        }, acc);
    }
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
Object invoke() throws Exception {
    AccessControlContext acc = this.acc;
    if ((acc == null) && (System.getSecurityManager() != null)) {
        throw new SecurityException("AccessControlContext is not set");
    }
    try {
        return AccessController.doPrivileged(
                new PrivilegedExceptionAction<Object>() {
                    public Object run() throws Exception {
                        return invokeInternal();
                    }
                },
                acc
        );
    }
    catch (PrivilegedActionException exception) {
        throw exception.getException();
    }
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * create a context that can read any directories (recursively)
 * mentioned in the class path. In the case of a jar, it has to
 * be the directory containing the jar, not just the jar, as jar
 * files might refer to other jar files.
 */

private static AccessControlContext getContext(File[] cp)
    throws java.net.MalformedURLException
{
    PathPermissions perms =
        new PathPermissions(cp);

    ProtectionDomain domain =
        new ProtectionDomain(new CodeSource(perms.getCodeBase(),
            (java.security.cert.Certificate[]) null),
        perms);

    AccessControlContext acc =
        new AccessControlContext(new ProtectionDomain[] { domain });

    return acc;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * Verify that the given AccessControlContext has permission to
 * accept this connection.
 */
void checkAcceptPermission(SecurityManager sm,
                           AccessControlContext acc)
{
    /*
     * Note: no need to synchronize on cache-related fields, since this
     * method only gets called from the ConnectionHandler's thread.
     */
    if (sm != cacheSecurityManager) {
        okContext = null;
        authCache = new WeakHashMap<AccessControlContext,
                                    Reference<AccessControlContext>>();
        cacheSecurityManager = sm;
    }
    if (acc.equals(okContext) || authCache.containsKey(acc)) {
        return;
    }
    InetAddress addr = socket.getInetAddress();
    String host = (addr != null) ? addr.getHostAddress() : "*";

    sm.checkAccept(host, socket.getPort());

    authCache.put(acc, new SoftReference<AccessControlContext>(acc));
    okContext = acc;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
/**
 * Retrieves the ticket corresponding to the client/server principal
 * pair from the Subject in the specified AccessControlContext.
 * If the ticket can not be found in the Subject, and if
 * useSubjectCredsOnly is false, then obtain ticket from
 * a LoginContext.
 */
static KerberosTicket getTicket(GSSCaller caller,
    String clientPrincipal, String serverPrincipal,
    AccessControlContext acc) throws LoginException {

    // Try to get ticket from acc's Subject
    Subject accSubj = Subject.getSubject(acc);
    KerberosTicket ticket =
        SubjectComber.find(accSubj, serverPrincipal, clientPrincipal,
              KerberosTicket.class);

    // Try to get ticket from Subject obtained from GSSUtil
    if (ticket == null && !GSSUtil.useSubjectCredsOnly(caller)) {
        Subject subject = GSSUtil.login(caller, GSSUtil.GSS_KRB5_MECH_OID);
        ticket = SubjectComber.find(subject,
            serverPrincipal, clientPrincipal, KerberosTicket.class);
    }
    return ticket;
}
 

import java.security.AccessControlContext; //導入依賴的package包/類
public static void main(String[] args) throws Exception {

        ProtectionDomain domain = new ProtectionDomain(null, null);

        AccessController.doPrivileged(new PrivilegedAction<Object>() {
            public Object run() {

                // this initialize ProxyLazyValues
                UIManager.getLookAndFeel();

                return null;
            }
        }, new AccessControlContext(new ProtectionDomain[]{domain}));

        weakRef = new WeakReference<ProtectionDomain>(domain);
        domain = null;

        Util.generateOOME();

        if (weakRef.get() != null) {
            throw new RuntimeException("Memory leak found!");
        }
        System.out.println("Test passed");
    }