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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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 com.android.ike.eap.statemachine;
import static com.android.ike.eap.message.EapData.EAP_TYPE_AKA_PRIME;
import static com.android.ike.eap.message.simaka.EapAkaTypeData.EAP_AKA_CLIENT_ERROR;
import android.content.Context;
import com.android.ike.eap.EapResult;
import com.android.ike.eap.EapSessionConfig.EapAkaPrimeConfig;
import com.android.ike.eap.message.EapData.EapMethod;
import com.android.ike.eap.message.EapMessage;
import com.android.ike.eap.message.simaka.EapAkaPrimeTypeData;
import com.android.ike.eap.message.simaka.EapAkaPrimeTypeData.EapAkaPrimeTypeDataDecoder;
import com.android.ike.eap.message.simaka.EapAkaTypeData;
import com.android.ike.eap.message.simaka.EapSimAkaAttribute;
import com.android.ike.eap.message.simaka.EapSimAkaAttribute.AtClientErrorCode;
import com.android.ike.eap.message.simaka.EapSimAkaTypeData.DecodeResult;
import com.android.internal.annotations.VisibleForTesting;
import java.util.Arrays;
import java.util.List;
/**
* EapAkaPrimeMethodStateMachine represents the valid paths possible for the EAP-AKA' protocol.
*
* <p>EAP-AKA' sessions will always follow the path:
*
* Created --+--> Identity --+--> Challenge --> Final
* | |
* +---------------+
*
* <p>Note: If the EAP-Request/AKA'-Challenge message contains an AUTN with an invalid sequence
* number, the peer will indicate a synchronization failure to the server and a new challenge will
* be attempted.
*
* <p>Note: EAP-Request/Notification messages can be received at any point in the above state
* machine At most one EAP-AKA'/Notification message is allowed per EAP-AKA' session.
*
* @see <a href="https://tools.ietf.org/html/rfc4187">RFC 4187, Extensible Authentication Protocol
* for Authentication and Key Agreement (EAP-AKA)</a>
* @see <a href="https://tools.ietf.org/html/rfc5448">RFC 5448, Improved Extensible Authentication
* Protocol Method for 3rd Generation Authentication and Key Agreement (EAP-AKA')</a>
*/
public class EapAkaPrimeMethodStateMachine extends EapAkaMethodStateMachine {
// EAP-AKA' identity prefix (RFC 5448#3)
private static final String AKA_PRIME_IDENTITY_PREFIX = "6";
private final EapAkaPrimeTypeDataDecoder mEapAkaPrimeTypeDataDecoder;
EapAkaPrimeMethodStateMachine(
Context context, byte[] eapIdentity, EapAkaPrimeConfig eapAkaPrimeConfig) {
this(
context,
eapIdentity,
eapAkaPrimeConfig,
EapAkaPrimeTypeData.getEapAkaPrimeTypeDataDecoder());
}
@VisibleForTesting
protected EapAkaPrimeMethodStateMachine(
Context context,
byte[] eapIdentity,
EapAkaPrimeConfig eapAkaPrimeConfig,
EapAkaPrimeTypeDataDecoder eapAkaPrimeTypeDataDecoder) {
super(context, eapIdentity, eapAkaPrimeConfig);
mEapAkaPrimeTypeDataDecoder = eapAkaPrimeTypeDataDecoder;
transitionTo(new CreatedState());
}
@Override
@EapMethod
int getEapMethod() {
return EAP_TYPE_AKA_PRIME;
}
@Override
protected DecodeResult<EapAkaTypeData> decode(byte[] typeData) {
return mEapAkaPrimeTypeDataDecoder.decode(typeData);
}
@Override
protected String getIdentityPrefix() {
return AKA_PRIME_IDENTITY_PREFIX;
}
@Override
protected ChallengeState buildChallengeState() {
return new ChallengeState();
}
@Override
protected ChallengeState buildChallengeState(byte[] identity) {
return new ChallengeState(identity);
}
protected class ChallengeState extends EapAkaMethodStateMachine.ChallengeState {
ChallengeState() {
super();
}
ChallengeState(byte[] identity) {
super(identity);
}
@Override
protected EapResult handleChallengeAuthentication(
EapMessage message, EapAkaTypeData eapAkaTypeData) {
return null;
}
}
EapAkaPrimeTypeData getEapSimAkaTypeData(AtClientErrorCode clientErrorCode) {
return new EapAkaPrimeTypeData(EAP_AKA_CLIENT_ERROR, Arrays.asList(clientErrorCode));
}
EapAkaPrimeTypeData getEapSimAkaTypeData(int eapSubtype, List<EapSimAkaAttribute> attributes) {
return new EapAkaPrimeTypeData(eapSubtype, attributes);
}
}
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