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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2016 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.oauth2;

import org.wildfly.common.Assert;
import org.wildfly.security.mechanism.AuthenticationMechanismException;
import org.wildfly.security.mechanism.oauth2.OAuth2InitialClientMessage;
import org.wildfly.security.mechanism.oauth2.OAuth2Server;
import org.wildfly.security.sasl.util.AbstractSaslServer;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslException;

import static org.wildfly.security.mechanism._private.ElytronMessages.saslOAuth2;

/**
 * An OAuth2 Sasl Server based on RFC-7628.
 *
 * @author Pedro Igor
 */
final class OAuth2SaslServer extends AbstractSaslServer {

    private static final int S_FIRST_MESSAGE = 1;
    private static final int S_IN_ERROR = 2;
    private OAuth2Server oAuth2Server;

    OAuth2SaslServer(String mechanismName, String protocol, String serverName, CallbackHandler callbackHandler, OAuth2Server oAuth2Server) {
        super(mechanismName, protocol, serverName, callbackHandler, saslOAuth2);
        this.oAuth2Server = oAuth2Server;
        setNegotiationState(S_FIRST_MESSAGE);
    }

    @Override
    public String getAuthorizationID() {
        return null;
    }

    protected byte[] evaluateMessage(final int state, final byte[] response) throws SaslException {
        boolean ok = false;
        try {
            switch (state) {
                case S_FIRST_MESSAGE: {
                    if (response == null || response.length == 0) {
                        throw saslOAuth2.mechClientRefusesToInitiateAuthentication().toSaslException();
                    }

                    OAuth2InitialClientMessage initialClientMessage = this.oAuth2Server.parseInitialClientMessage(response);

                    byte[] serverResponse = this.oAuth2Server.evaluateInitialResponse(initialClientMessage);

                    // successful authentication, otherwise the server responds with an error message
                    if (serverResponse.length == 0) {
                        ok = true;
                        negotiationComplete();
                    } else {
                        ok = true;
                        setNegotiationState(S_IN_ERROR);
                    }

                    return serverResponse;
                }
                case S_IN_ERROR: {
                    // client sent dummy client response, server fails the authentication
                    throw saslOAuth2.mechAuthenticationFailed().toSaslException();
                }
                case COMPLETE_STATE: {
                    if (response != null && response.length != 0) {
                        throw saslOAuth2.mechClientSentExtraMessage().toSaslException();
                    }
                    ok = true;
                    return null;
                }
                case FAILED_STATE: {
                    throw saslOAuth2.mechAuthenticationFailed().toSaslException();
                }
            }
            throw Assert.impossibleSwitchCase(state);
        } catch (AuthenticationMechanismException e) {
            throw e.toSaslException();
        } finally {
            if (!ok) {
                setNegotiationState(FAILED_STATE);
            }
        }
    }

    public void dispose() throws SaslException {
        setNegotiationState(FAILED_STATE);
    }
}