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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.wildfly.security.sasl.gssapi;
import static org.wildfly.security.mechanism._private.ElytronMessages.saslGssapi;
import static org.wildfly.security.mechanism.gssapi.GSSCredentialSecurityFactory.KERBEROS_V5;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;
import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSCredential;
import org.ietf.jgss.GSSException;
import org.ietf.jgss.GSSManager;
import org.ietf.jgss.GSSName;
import org.ietf.jgss.MessageProp;
import org.wildfly.common.Assert;
import org.wildfly.security.auth.callback.CredentialCallback;
import org.wildfly.security.credential.GSSKerberosCredential;
import org.wildfly.security.manager.action.SetContextClassLoaderAction;
import org.wildfly.security.manager.action.SetContextClassLoaderFromClassAction;
import org.wildfly.security.sasl.WildFlySasl;
import org.wildfly.security.sasl.util.SaslMechanismInformation;
/**
* SaslClient for the GSSAPI mechanism as defined by RFC 4752
*
* @author Darran Lofthouse
*/
final class GssapiClient extends AbstractGssapiMechanism implements SaslClient {
private static final int INITIAL_CHALLENGE_STATE = 1;
private static final int CHALLENGE_RESPONSE_STATE = 2;
private static final int SECURITY_LAYER_NEGOTIATION_STATE = 3;
private final String authorizationId;
GssapiClient(final String protocol, final String serverName, final Map props,
final CallbackHandler callbackHandler, final String authorizationId) throws SaslException {
super(SaslMechanismInformation.Names.GSSAPI, protocol, serverName, props, callbackHandler);
this.authorizationId = authorizationId;
// Initialise our GSSContext
GSSManager manager = GSSManager.getInstance();
String acceptorNameString = protocol + "@" + serverName;
saslGssapi.tracef("Acceptor Name '%s'", acceptorNameString);
final GSSName acceptorName;
try {
// The client can use other name types but this should be added to the config.
acceptorName = manager.createName(acceptorNameString, GSSName.NT_HOSTBASED_SERVICE, KERBEROS_V5);
} catch (GSSException e) {
throw saslGssapi.mechUnableToCreateNameForAcceptor(e).toSaslException();
}
// Pull the credential if we have it.
GSSCredential credential = null;
Object credObj = props.get(Sasl.CREDENTIALS);
if (credObj instanceof GSSCredential) {
saslGssapi.trace("Using GSSCredential supplied in properties.");
credential = (GSSCredential) credObj;
} else if (credObj instanceof GSSKerberosCredential) {
saslGssapi.trace("Using GSSCredential supplied in properties.");
credential = ((GSSKerberosCredential) credObj).getGssCredential();
}
if (credential == null) {
CredentialCallback callback = new CredentialCallback(GSSKerberosCredential.class);
try {
tryHandleCallbacks(callback);
GSSKerberosCredential kerberosCredential = callback.getCredential(GSSKerberosCredential.class);
if (kerberosCredential != null) {
saslGssapi.tracef("GSSCredential obtained from CredentialCallback.");
credential = kerberosCredential.getGssCredential();
} else {
saslGssapi.trace("No GSSCredential obtained from CredentialCallback.");
}
} catch (UnsupportedCallbackException e) {
saslGssapi.trace("CallbackHandler does not support CredentialCallback", e);
}
}
final GSSContext gssContext;
try {
gssContext = manager.createContext(acceptorName, KERBEROS_V5, credential, GSSContext.INDEFINITE_LIFETIME);
} catch (GSSException e) {
throw saslGssapi.mechUnableToCreateGssContext(e).toSaslException();
}
try {
// JDK only sets this if a credential was supplied, we should support a config override.
// i.e. we may have a credential because it was delegated to us - doesn't mean we want
// to delegate it further - at same point we may have a Subject on ACC and still want to delegate.
boolean delegate = credential != null;
if (props.containsKey(WildFlySasl.GSSAPI_DELEGATE_CREDENTIAL)) {
delegate = Boolean.parseBoolean((String) props.get(WildFlySasl.GSSAPI_DELEGATE_CREDENTIAL));
}
saslGssapi.tracef("Delegating credential = %b", delegate);
if (delegate) {
gssContext.requestCredDeleg(true);
}
// The client must pass the integ_req_flag of true.
gssContext.requestInteg(true);
// This was requested so that integrity protection can be used to negotiate the security layer,
// further integrity protection will be based on the negotiated security layer.
// requestMutualAuth if: -
// 1 - The client requests it.
// 2 - The client will be requesting a security layer. Will interpret as may be requesting as
// client and server could agree auth only.
boolean serverAuth = false;
if (props.containsKey(Sasl.SERVER_AUTH)) {
serverAuth = Boolean.parseBoolean((String) props.get(Sasl.SERVER_AUTH));
}
boolean mayRequireSecurityLayer = mayRequireSecurityLater(orderedQops);
boolean requestMutualAuth = serverAuth || mayRequireSecurityLayer;
saslGssapi.tracef("Setting requering mutual authentication to %b", requestMutualAuth);
gssContext.requestMutualAuth(requestMutualAuth);
// Request sequence detection if a security layer could be requested.
if (mayRequireSecurityLayer) {
saslGssapi.trace("Requesting sequence detection.");
gssContext.requestSequenceDet(true);
}
// Need to set this is we may want confidentiality, integrity is always requested.
for (QOP current : orderedQops) {
if (current == QOP.AUTH_CONF) {
saslGssapi.trace("Requesting confidentiality");
gssContext.requestConf(true);
break;
}
}
} catch (GSSException e) {
throw saslGssapi.mechUnableToSetGssContextRequestFlags(e).toSaslException();
}
// Channel Binding Is Not Supported
this.gssContext = gssContext;
}
private boolean mayRequireSecurityLater(final QOP[] preferredQop) {
for (QOP current : preferredQop) {
if (current == QOP.AUTH_INT || current == QOP.AUTH_CONF) {
return true;
}
}
return false;
}
private QOP findAgreeableQop(final byte securityLayer) throws SaslException {
for (QOP current : orderedQops) {
if (current.includedBy(securityLayer) && isCompatibleWithGssContext(current)) {
return current;
}
}
throw saslGssapi.mechInsufficientQopsAvailable().toSaslException();
}
private boolean isCompatibleWithGssContext(final QOP qop) {
switch (qop) {
case AUTH_INT:
return gssContext.getIntegState();
case AUTH_CONF:
return gssContext.getIntegState() && gssContext.getConfState();
default:
return true;
}
}
@Override
public void init() {
setNegotiationState(INITIAL_CHALLENGE_STATE);
}
@Override
public boolean hasInitialResponse() {
return true;
}
@Override
public byte[] evaluateChallenge(byte[] challenge) throws SaslException {
return evaluateMessage(challenge);
}
@Override
protected byte[] evaluateMessage(int state, final byte[] message) throws SaslException {
switch (state) {
case INITIAL_CHALLENGE_STATE:
// GSSAPI is a client first mechanism, this state both verifies that requirement is met and
// provides the first token from the client
assert gssContext.isEstablished() == false;
if (message.length > 0) {
throw saslGssapi.mechInitialChallengeMustBeEmpty().toSaslException();
}
try {
byte[] response = initSecContext(gssContext, NO_BYTES, 0, 0);
if (gssContext.isEstablished()) {
saslGssapi.trace("GSSContext established, transitioning to negotiate security layer.");
setNegotiationState(SECURITY_LAYER_NEGOTIATION_STATE);
} else {
saslGssapi.trace("GSSContext not established, expecting subsequent exchanges.");
setNegotiationState(CHALLENGE_RESPONSE_STATE);
}
return response;
} catch (GSSException e) {
throw saslGssapi.mechUnableToCreateResponseToken(e).toSaslException();
}
case CHALLENGE_RESPONSE_STATE:
// This state is to handle the subsequent exchange of tokens up until the point the
// GSSContext is established
assert gssContext.isEstablished() == false;
try {
byte[] response = initSecContext(gssContext, message, 0, message.length);
if (gssContext.isEstablished()) {
saslGssapi.trace("GSSContext established, transitioning to negotiate security layer.");
setNegotiationState(SECURITY_LAYER_NEGOTIATION_STATE);
if (response == null) response = NO_BYTES;
} else {
saslGssapi.trace("GSSContext not established, expecting subsequent exchanges.");
}
return response;
} catch (GSSException e) {
throw saslGssapi.mechUnableToHandleResponseFromServer(e).toSaslException();
}
case SECURITY_LAYER_NEGOTIATION_STATE:
assert gssContext.isEstablished();
MessageProp msgProp = new MessageProp(0, false);
try {
byte[] unwrapped = gssContext.unwrap(message, 0, message.length, msgProp);
if (unwrapped.length != 4) {
throw saslGssapi.mechBadLengthOfMessageForNegotiatingSecurityLayer().toSaslException();
}
byte qopByte = unwrapped[0];
selectedQop = findAgreeableQop(qopByte);
maxBuffer = networkOrderBytesToInt(unwrapped, 1, 3);
saslGssapi.tracef("Selected QOP=%s, maxBuffer=%d", selectedQop, maxBuffer);
if (relaxComplianceChecks == false && maxBuffer > 0 && (qopByte & QOP.AUTH_INT.getValue()) == 0
&& (qopByte & QOP.AUTH_CONF.getValue()) == 0) {
throw saslGssapi.mechReceivedMaxMessageSizeWhenNoSecurityLayer(maxBuffer).toSaslException();
}
maxBuffer = gssContext.getWrapSizeLimit(0, selectedQop == QOP.AUTH_CONF, maxBuffer);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos.write(selectedQop.getValue());
if (selectedQop == QOP.AUTH) {
// No security layer selected to must set response to 000.
baos.write(new byte[] { 0x00, 0x00, 0x00 });
} else {
actualMaxReceiveBuffer = configuredMaxReceiveBuffer!=0 ? configuredMaxReceiveBuffer : maxBuffer;
saslGssapi.tracef("Out max buffer %d", actualMaxReceiveBuffer);
baos.write(intToNetworkOrderBytes(actualMaxReceiveBuffer));
}
if (authorizationId != null) {
baos.write(authorizationId.getBytes(StandardCharsets.UTF_8));
}
byte[] response = baos.toByteArray();
msgProp = new MessageProp(0, false);
response = gssContext.wrap(response, 0, response.length, msgProp);
if (selectedQop != QOP.AUTH) {
saslGssapi.trace("Setting message wrapper.");
setWrapper(new GssapiWrapper(selectedQop == QOP.AUTH_CONF));
}
saslGssapi.trace("Negotiation Complete");
negotiationComplete();
return response;
} catch (IOException e) {
throw saslGssapi.mechUnableToCreateResponseToken(e).toSaslException();
} catch (GSSException e) {
throw saslGssapi.mechUnableToUnwrapSecurityLayerNegotiationMessage(e).toSaslException();
}
}
throw Assert.impossibleSwitchCase(state);
}
private static byte[] initSecContext(final GSSContext gssContext, final byte[] inputBuf, final int offset, final int len) throws GSSException {
final ClassLoader old = doPrivileged(new SetContextClassLoaderFromClassAction(GssapiClient.class));
try {
return gssContext.initSecContext(inputBuf, offset, len);
} finally {
doPrivileged(new SetContextClassLoaderAction(old));
}
}
private static T doPrivileged(final PrivilegedAction action) {
return System.getSecurityManager() != null ? AccessController.doPrivileged(action) : action.run();
}
}
