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WildFly Security GSSAPI SASL Implementation
/*
* 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 java.util.Collections;
import java.util.Map;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslException;
import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSException;
import org.ietf.jgss.MessageProp;
import org.wildfly.common.Assert;
import org.wildfly.security.sasl.WildFlySasl;
import org.wildfly.security.sasl.util.AbstractSaslParticipant;
import org.wildfly.security.sasl.util.SaslWrapper;
import static org.wildfly.security.mechanism._private.ElytronMessages.saslGssapi;
/**
* Base class for the SaslServer and SaslClient implementations implementing the GSSAPI mechanism as defined by RFC 4752
*
* @author Darran Lofthouse
*/
abstract class AbstractGssapiMechanism extends AbstractSaslParticipant {
private static final String AUTH = "auth";
private static final String AUTH_INT = "auth-int";
private static final String AUTH_CONF = "auth-conf";
private static final byte NO_SECURITY_LAYER = (byte) 0x01;
private static final byte INTEGRITY_PROTECTION = (byte) 0x02;
private static final byte CONFIDENTIALITY_PROTECTION = (byte) 0x04;
protected static final int DEFAULT_MAX_BUFFER_SIZE = (int) 0xFFFFFF; // 3 bytes
protected GSSContext gssContext;
protected final int configuredMaxReceiveBuffer;
protected int actualMaxReceiveBuffer;
protected int maxBuffer;
protected final boolean relaxComplianceChecks;
protected final QOP[] orderedQops;
protected QOP selectedQop;
protected AbstractGssapiMechanism(String mechanismName, String protocol, String serverName, Map props,
final CallbackHandler callbackHandler) throws SaslException {
super(mechanismName, protocol, serverName, callbackHandler, saslGssapi);
Assert.checkNotNullParam("callbackHandler", callbackHandler);
if (props == null) props = Collections.emptyMap();
if (props.containsKey(Sasl.MAX_BUFFER)) {
configuredMaxReceiveBuffer = Integer.parseInt((String) props.get(Sasl.MAX_BUFFER));
if (configuredMaxReceiveBuffer > DEFAULT_MAX_BUFFER_SIZE) {
throw saslGssapi.mechReceiveBufferIsGreaterThanMaximum(configuredMaxReceiveBuffer, DEFAULT_MAX_BUFFER_SIZE).toSaslException();
}
} else {
configuredMaxReceiveBuffer = DEFAULT_MAX_BUFFER_SIZE;
}
if (props.containsKey(WildFlySasl.RELAX_COMPLIANCE)) {
relaxComplianceChecks = Boolean.parseBoolean((String) props.get(WildFlySasl.RELAX_COMPLIANCE));
} else {
relaxComplianceChecks = false;
}
orderedQops = parsePreferredQop((String) props.get(Sasl.QOP));
if (saslGssapi.isTraceEnabled()) {
saslGssapi.tracef("configuredMaxReceiveBuffer=%d", configuredMaxReceiveBuffer);
saslGssapi.tracef("relaxComplianceChecks=%b", relaxComplianceChecks);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < orderedQops.length; i++) {
if (i > 0) {
sb.append(", ");
}
sb.append(orderedQops[i]);
}
saslGssapi.tracef("QOP={%s}", sb.toString());
}
}
/**
* Converts bytes in network byte order to an integer starting from the specified offset.
*
* This method is implemented in the context of the GSSAPI mechanism, it is assumed that the size of the byte array is
* appropriate.
*/
protected int networkOrderBytesToInt(final byte[] bytes, final int start, final int length) {
int result = 0;
for (int i = start; i < length + start; i++) {
result <<= 8;
result |= (int)bytes[i] & 0xFF;
}
return result;
}
/**
* Obtain a 3 byte representation of an int, as an internal method it is assumed the maximum value of the int has already
* takine into account that it needs to fit into tree bytes,
*/
protected byte[] intToNetworkOrderBytes(final int value) {
byte[] response = new byte[3];
int workingValue = value;
for (int i = response.length - 1; i >= 0; i--) {
response[i] = (byte) (workingValue & 0xFF);
workingValue >>>= 8;
}
return response;
}
@Override
public void dispose() throws SaslException {
try {
saslGssapi.trace("dispose");
gssContext.dispose();
} catch (GSSException e) {
throw saslGssapi.mechUnableToDisposeGssContext(e).toSaslException();
} finally {
gssContext = null;
}
}
protected QOP[] parsePreferredQop(final String qop) throws SaslException {
if (qop != null) {
String[] qopNames = qop.trim().split("\\s*,\\s*");
if (qopNames.length > 0) {
QOP[] preferredQop = new QOP[qopNames.length];
for (int i = 0; i < qopNames.length; i++) {
QOP mapped = QOP.mapFromName(qopNames[i]);
if (mapped == null) {
throw saslGssapi.mechUnexpectedQop(qopNames[i]).toSaslException();
}
preferredQop[i] = mapped;
}
return preferredQop;
}
}
return new QOP[] { QOP.AUTH };
}
@Override
public Object getNegotiatedProperty(String propName) {
assertComplete();
switch (propName) {
case Sasl.QOP:
return selectedQop.getName();
case Sasl.MAX_BUFFER:
return Integer.toString(actualMaxReceiveBuffer != 0 ? actualMaxReceiveBuffer : configuredMaxReceiveBuffer);
case Sasl.RAW_SEND_SIZE:
return Integer.toString(maxBuffer);
}
return null;
}
protected enum QOP {
AUTH(AbstractGssapiMechanism.AUTH, NO_SECURITY_LAYER), AUTH_INT(AbstractGssapiMechanism.AUTH_INT, INTEGRITY_PROTECTION), AUTH_CONF(
AbstractGssapiMechanism.AUTH_CONF, CONFIDENTIALITY_PROTECTION);
private final String name;
private final byte value;
private QOP(final String name, final byte value) {
this.name = name;
this.value = value;
}
public String getName() {
return name;
}
public byte getValue() {
return value;
}
public boolean includedBy(final byte securityLayer) {
return (securityLayer & value) == value;
}
public static QOP mapFromValue(final byte value) {
switch (value) {
case NO_SECURITY_LAYER:
return AUTH;
case INTEGRITY_PROTECTION:
return AUTH_INT;
case CONFIDENTIALITY_PROTECTION:
return AUTH_CONF;
default:
return null;
}
}
public static QOP mapFromName(final String name) {
switch (name) {
case AbstractGssapiMechanism.AUTH:
return AUTH;
case AbstractGssapiMechanism.AUTH_INT:
return AUTH_INT;
case AbstractGssapiMechanism.AUTH_CONF:
return AUTH_CONF;
default:
return null;
}
}
}
protected class GssapiWrapper implements SaslWrapper {
private final boolean confidential;
protected GssapiWrapper(final boolean confidential) {
this.confidential = confidential;
}
@Override
public byte[] wrap(byte[] outgoing, int offset, int len) throws SaslException {
MessageProp prop = new MessageProp(0, confidential);
try {
byte[] response = gssContext.wrap(outgoing, offset, len, prop);
saslGssapi.tracef("Wrapping message of length '%d' resulting message of length '%d'", len, response.length);
return response;
} catch (GSSException e) {
throw saslGssapi.mechUnableToWrapMessage(e).toSaslException();
}
}
@Override
public byte[] unwrap(byte[] incoming, int offset, int len) throws SaslException {
MessageProp prop = new MessageProp(0, confidential);
try {
byte[] response = gssContext.unwrap(incoming, offset, len, prop);
saslGssapi.tracef("Unwrapping message of length '%d' resulting message of length '%d'", len, response.length);
return response;
} catch (GSSException e) {
throw saslGssapi.mechUnableToUnwrapMessage(e).toSaslException();
}
}
}
}