Java Subject.doAs方法代碼示例

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {

        // We don't care about clock difference
        new FileOutputStream("krb5.conf").write(
                "[libdefaults]\nclockskew=999999999".getBytes());
        System.setProperty("java.security.krb5.conf", "krb5.conf");
        Config.refresh();

        Subject subj = new Subject();
        KerberosPrincipal kp = new KerberosPrincipal(princ);
        KerberosKey kk = new KerberosKey(
                kp, key, EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96, 0);
        subj.getPrincipals().add(kp);
        subj.getPrivateCredentials().add(kk);

        Subject.doAs(subj, new PrivilegedExceptionAction() {
            public Object run() throws Exception {
                GSSManager man = GSSManager.getInstance();
                GSSContext ctxt = man.createContext(man.createCredential(
                        null, GSSCredential.INDEFINITE_LIFETIME,
                        GSSUtil.GSS_KRB5_MECH_OID, GSSCredential.ACCEPT_ONLY));
                return ctxt.acceptSecContext(token, 0, token.length);
            }
        });
    }
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static String validateServiceTicket(Subject subject, final byte[] serviceTicket)
    throws GSSException, IllegalAccessException, NoSuchFieldException, ClassNotFoundException,
    PrivilegedActionException {
  // Kerberos version 5 OID
  Oid krb5Oid = KerberosUtils.getOidInstance("GSS_KRB5_MECH_OID");


  // Accept the context and return the client principal name.
  return Subject.doAs(subject, new PrivilegedExceptionAction<String>() {

    @Override
    public String run() throws Exception {
      String clientName = null;
      // Identify the server that communications are being made to.
      GSSManager manager = GSSManager.getInstance();
      GSSContext context = manager.createContext((GSSCredential) null);
      context.acceptSecContext(serviceTicket, 0, serviceTicket.length);
      clientName = context.getSrcName().toString();
      return clientName;
    }
  });
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
  System.out.println("Thrift2 Demo");
  System.out.println("Usage: DemoClient [host=localhost] [port=9090] [secure=false]");
  System.out.println("This demo assumes you have a table called \"example\" with a column family called \"family1\"");

  // use passed in arguments instead of defaults
  if (args.length >= 1) {
    host = args[0];
  }
  if (args.length >= 2) {
    port = Integer.parseInt(args[1]);
  }
  if (args.length >= 3) {
    secure = Boolean.parseBoolean(args[2]);
  }

  final DemoClient client = new DemoClient();
  Subject.doAs(getSubject(),
    new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws Exception {
        client.run();
        return null;
      }
    });
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
private void createSaslServer(String mechanism) throws IOException {
    this.saslMechanism = mechanism;
    if (!ScramMechanism.isScram(mechanism))
        callbackHandler = new SaslServerCallbackHandler(jaasContext, kerberosNamer);
    else
        callbackHandler = new ScramServerCallbackHandler(credentialCache.cache(mechanism, ScramCredential.class));
    callbackHandler.configure(configs, Mode.SERVER, subject, saslMechanism);
    if (mechanism.equals(SaslConfigs.GSSAPI_MECHANISM)) {
        saslServer = createSaslKerberosServer(callbackHandler, configs, subject);
    } else {
        try {
            saslServer = Subject.doAs(subject, new PrivilegedExceptionAction<SaslServer>() {
                public SaslServer run() throws SaslException {
                    // 調用createSaslServer
                    return Sasl.createSaslServer(saslMechanism, "kafka", host, configs, callbackHandler);
                }
            });
        } catch (PrivilegedActionException e) {
            throw new SaslException("Kafka Server failed to create a SaslServer to interact with a client during session authentication", e.getCause());
        }
    }
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
private byte[] createSaslToken(final byte[] saslToken, boolean isInitial) throws SaslException {
    if (saslToken == null)
        throw new SaslException("Error authenticating with the Kafka Broker: received a `null` saslToken.");

    try {
        // 初始Response的處理
        if (isInitial && !saslClient.hasInitialResponse())
            return saslToken;
        else
            return Subject.doAs(subject, new PrivilegedExceptionAction<byte[]>() {
                public byte[] run() throws SaslException {
                    // 調用evalueteChallenge方法處理Challenge信息
                    return saslClient.evaluateChallenge(saslToken);
                }
            });
    } catch (PrivilegedActionException e) {
        String error = "An error: (" + e + ") occurred when evaluating SASL token received from the Kafka Broker.";
        // Try to provide hints to use about what went wrong so they can fix their configuration.
        // TODO: introspect about e: look for GSS information.
        final String unknownServerErrorText =
            "(Mechanism level: Server not found in Kerberos database (7) - UNKNOWN_SERVER)";
        if (e.toString().contains(unknownServerErrorText)) {
            error += " This may be caused by Java's being unable to resolve the Kafka Broker's" +
                " hostname correctly. You may want to try to adding" +
                " '-Dsun.net.spi.nameservice.provider.1=dns,sun' to your client's JVMFLAGS environment." +
                " Users must configure FQDN of kafka brokers when authenticating using SASL and" +
                " `socketChannel.socket().getInetAddress().getHostName()` must match the hostname in `principal/[email protected]`";
        }
        error += " Kafka Client will go to AUTH_FAILED state.";
        //Unwrap the SaslException inside `PrivilegedActionException`
        throw new SaslException(error, e.getCause());
    }
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main (String args[]) throws Exception {

        ObjectName[] mbeanNames = new ObjectName[6];
        ObservedObject[] monitored = new ObservedObject[6];
        ObjectName[] monitorNames = new ObjectName[6];
        Monitor[] monitor = new Monitor[6];
        String[] principals = { "role1", "role2" };
        String[] attributes = { "Integer", "Double", "String" };

        try {
            echo(">>> CREATE MBeanServer");
            MBeanServer server = MBeanServerFactory.newMBeanServer();

            for (int i = 0; i < 6; i++) {
                mbeanNames[i] =
                    new ObjectName(":type=ObservedObject,instance=" + i);
                monitored[i] = new ObservedObject();
                echo(">>> CREATE ObservedObject = " + mbeanNames[i].toString());
                server.registerMBean(monitored[i], mbeanNames[i]);

                switch (i) {
                    case 0:
                    case 3:
                        monitorNames[i] =
                            new ObjectName(":type=CounterMonitor,instance=" + i);
                        monitor[i] = new CounterMonitor();
                        break;
                    case 1:
                    case 4:
                        monitorNames[i] =
                            new ObjectName(":type=GaugeMonitor,instance=" + i);
                        monitor[i] = new GaugeMonitor();
                        break;
                    case 2:
                    case 5:
                        monitorNames[i] =
                            new ObjectName(":type=StringMonitor,instance=" + i);
                        monitor[i] = new StringMonitor();
                        break;
                }

                echo(">>> CREATE Monitor = " + monitorNames[i].toString());
                server.registerMBean(monitor[i], monitorNames[i]);
                monitor[i].addObservedObject(mbeanNames[i]);
                monitor[i].setObservedAttribute(attributes[i % 3]);
                monitor[i].setGranularityPeriod(500);
                final Monitor m = monitor[i];
                Subject subject = new Subject();
                echo(">>> RUN Principal = " + principals[i / 3]);
                subject.getPrincipals().add(new JMXPrincipal(principals[i / 3]));
                PrivilegedAction<Void> action = new PrivilegedAction<Void>() {
                    public Void run() {
                        m.start();
                        return null;
                    }
                };
                Subject.doAs(subject, action);
            }

            while(!testPrincipals(monitored, monitorNames, monitor, principals));

        } finally {
            for (int i = 0; i < 6; i++)
                if (monitor[i] != null)
                    monitor[i].stop();
        }
    }
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
@Override
public Object run() throws Exception {
    Utils.readFile(filename);
    AccessControlContext acc = AccessController.getContext();
    Subject subject = Subject.getSubject(acc);
    ReadPropertyExceptionAction readProperty =
            new ReadPropertyExceptionAction();
    return Subject.doAs(subject, readProperty);
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
/**
 * Test for the case that UserGroupInformation.getCurrentUser()
 * is called when the AccessControlContext has a Subject associated
 * with it, but that Subject was not created by Hadoop (ie it has no
 * associated User principal)
 */
@Test (timeout = 30000)
public void testUGIUnderNonHadoopContext() throws Exception {
  Subject nonHadoopSubject = new Subject();
  Subject.doAs(nonHadoopSubject, new PrivilegedExceptionAction<Void>() {
      @Override
      public Void run() throws IOException {
        UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
        assertNotNull(ugi);
        return null;
      }
    });
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main(String args[]) {
    Subject subject = new Subject();
    subject.getPrincipals().add(new X500Principal("CN=Duke"));
    Subject anotherSubject = new Subject();
    anotherSubject.getPrincipals().add(new X500Principal("CN=Java"));
    ReadFromFileAction readFromFile
            = new ReadFromFileAction(NestedActions.file, anotherSubject);
    WriteToFileAction writeToFile
            = new WriteToFileAction(NestedActions.file, readFromFile);
    Subject.doAs(subject, writeToFile);
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main(String[] args) {
    Subject subject = new Subject();
    final Set principals = subject.getPrincipals();
    principals.add(new X500Principal("CN=Alice"));
    new Thread() {
        public void run() {
            Principal last = new X500Principal("CN=Bob");
            for (int i = 0; !finished; i++) {
                Principal next = new X500Principal("CN=Bob" + i);
                principals.add(next);
                principals.remove(last);
                last = next;
            }
        }
    }.start();
    for (int i = 0; i < 1000; i++) {
        Subject.doAs(
            subject,
            new PrivilegedAction() {
                public Object run() {
                    return Subject.doAs(
                        new Subject(true,
                                    Collections.singleton(
                                        new X500Principal("CN=Claire")),
                                    Collections.EMPTY_SET,
                                    Collections.EMPTY_SET),
                        new PrivilegedAction() {
                            public Object run() {
                                return null;
                            }
                        });
                }
            });
    }
    finished = true;
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
public static void main(String args[]) {
    Subject subject = new Subject();
    subject.getPrincipals().add(new X500Principal("CN=Duke"));
    WriteToFileNegativeAction writeToFile
            = new WriteToFileNegativeAction(NestedActions.file);
    Subject.doAs(subject, writeToFile);
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
@Override
public Object run() throws Exception {
    Utils.writeFile(filename);
    AccessControlContext acc = AccessController.getContext();
    Subject subject = Subject.getSubject(acc);
    ReadFromFileExceptionAction readFromFile =
            new ReadFromFileExceptionAction(filename);
    return Subject.doAs(subject, readFromFile);
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
/**
 * Does something using the Subject inside
 * @param action the action
 * @param in the input byte
 * @return the output byte
 * @throws java.lang.Exception
 */
public byte[] doAs(final Action action, final byte[] in) throws Exception {
    try {
        return Subject.doAs(s, new PrivilegedExceptionAction<byte[]>() {

            @Override
            public byte[] run() throws Exception {
                return action.run(Context.this, in);
            }
        });
    } catch (PrivilegedActionException pae) {
        throw pae.getException();
    }
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
private byte[] createSaslToken(final byte[] saslToken) throws SaslException {
    if (saslToken == null) {
        // TODO: introspect about runtime environment (such as jaas.conf)
        saslState = SaslState.FAILED;
        throw new SaslException("Error in authenticating with a Zookeeper Quorum member: the quorum member's saslToken is null.");
    }

    Subject subject = login.getSubject();
    if (subject != null) {
        synchronized(login) {
            try {
                final byte[] retval =
                    Subject.doAs(subject, new PrivilegedExceptionAction<byte[]>() {
                            public byte[] run() throws SaslException {
                                LOG.debug("saslClient.evaluateChallenge(len="+saslToken.length+")");
                                return saslClient.evaluateChallenge(saslToken);
                            }
                        });
                return retval;
            }
            catch (PrivilegedActionException e) {
                String error = "An error: (" + e + ") occurred when evaluating Zookeeper Quorum Member's " +
                  " received SASL token.";
                // Try to provide hints to use about what went wrong so they can fix their configuration.
                // TODO: introspect about e: look for GSS information.
                final String UNKNOWN_SERVER_ERROR_TEXT =
                  "(Mechanism level: Server not found in Kerberos database (7) - UNKNOWN_SERVER)";
                if (e.toString().indexOf(UNKNOWN_SERVER_ERROR_TEXT) > -1) {
                    error += " This may be caused by Java's being unable to resolve the Zookeeper Quorum Member's" +
                      " hostname correctly. You may want to try to adding" +
                      " '-Dsun.net.spi.nameservice.provider.1=dns,sun' to your client's JVMFLAGS environment.";
                }
                error += " Zookeeper Client will go to AUTH_FAILED state.";
                LOG.error(error);
                saslState = SaslState.FAILED;
                throw new SaslException(error);
            }
        }
    }
    else {
        throw new SaslException("Cannot make SASL token without subject defined. " +
          "For diagnosis, please look for WARNs and ERRORs in your log related to the Login class.");
    }
}
 

import javax.security.auth.Subject; //導入方法依賴的package包/類
@Test public void testAuthenticatedClientsAllowed() throws Exception {
  Assume.assumeThat("Test disabled on Windows", File.separatorChar, is('/'));

  // Create the subject for the client
  final Subject clientSubject = AvaticaJaasKrbUtil.loginUsingKeytab(
      SpnegoTestUtil.CLIENT_PRINCIPAL, clientKeytab);
  final Set<Principal> clientPrincipals = clientSubject.getPrincipals();
  // Make sure the subject has a principal
  assertFalse(clientPrincipals.isEmpty());

  // Get a TGT for the subject (might have many, different encryption types). The first should
  // be the default encryption type.
  Set<KerberosTicket> privateCredentials =
          clientSubject.getPrivateCredentials(KerberosTicket.class);
  assertFalse(privateCredentials.isEmpty());
  KerberosTicket tgt = privateCredentials.iterator().next();
  assertNotNull(tgt);
  LOG.info("Using TGT with etype: {}", tgt.getSessionKey().getAlgorithm());

  // The name of the principal
  final String principalName = clientPrincipals.iterator().next().getName();

  // Run this code, logged in as the subject (the client)
  byte[] response = Subject.doAs(clientSubject, new PrivilegedExceptionAction<byte[]>() {
    @Override public byte[] run() throws Exception {
      // Logs in with Kerberos via GSS
      GSSManager gssManager = GSSManager.getInstance();
      Oid oid = new Oid(SpnegoTestUtil.JGSS_KERBEROS_TICKET_OID);
      GSSName gssClient = gssManager.createName(principalName, GSSName.NT_USER_NAME);
      GSSCredential credential = gssManager.createCredential(gssClient,
          GSSCredential.DEFAULT_LIFETIME, oid, GSSCredential.INITIATE_ONLY);

      // Passes the GSSCredential into the HTTP client implementation
      final AvaticaCommonsHttpClientSpnegoImpl httpClient =
          new AvaticaCommonsHttpClientSpnegoImpl(httpServerUrl, credential);

      return httpClient.send(new byte[0]);
    }
  });

  // We should get a response which is "OK" with our client's name
  assertNotNull(response);
  assertEquals("OK " + SpnegoTestUtil.CLIENT_PRINCIPAL,
      new String(response, StandardCharsets.UTF_8));
}