| /* |
| * 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.internal.net.eap.message; |
| |
| import android.annotation.IntDef; |
| import android.annotation.NonNull; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| |
| /** |
| * EapData represents the data-bytes of an EAP-Packet. |
| * |
| * <p>EapData objects will always have a Type-value and the Type-Data bytes that follow. |
| * |
| * EapData objects should be parsed from the Type and Type-Data sections of an EAP Packet, as shown |
| * below: |
| * |
| * +-----------------+-----------------+----------------------------------+ |
| * | Code (1B) | Identifier (1B) | Length (2B) | |
| * +-----------------+-----------------+----------------------------------+ |
| * | Type (1B) | Type-Data ... |
| * +-----------------+----- |
| * |
| * @see <a href="https://tools.ietf.org/html/rfc3748#section-4">RFC 3748, Extensible Authentication |
| * Protocol (EAP)</a> |
| */ |
| public class EapData { |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef({ |
| EAP_IDENTITY, |
| EAP_NOTIFICATION, |
| EAP_NAK, |
| EAP_TYPE_SIM, |
| EAP_TYPE_AKA, |
| EAP_TYPE_MSCHAP_V2, |
| EAP_TYPE_AKA_PRIME |
| }) |
| public @interface EapType {} |
| |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef({ |
| EAP_TYPE_SIM, |
| EAP_TYPE_AKA, |
| EAP_TYPE_MSCHAP_V2, |
| EAP_TYPE_AKA_PRIME |
| }) |
| public @interface EapMethod {} |
| |
| // EAP Type values defined by IANA |
| // https://www.iana.org/assignments/eap-numbers/eap-numbers.xhtml |
| public static final int EAP_IDENTITY = 1; |
| public static final int EAP_NOTIFICATION = 2; |
| public static final int EAP_NAK = 3; |
| // EAP_MD5_CHALLENGE unsupported, allowable based on RFC 3748, Section 5.4 |
| public static final int EAP_TYPE_SIM = 18; |
| public static final int EAP_TYPE_AKA = 23; |
| public static final int EAP_TYPE_MSCHAP_V2 = 26; |
| public static final int EAP_TYPE_AKA_PRIME = 50; |
| |
| public static final Map<Integer, String> EAP_TYPE_STRING = new HashMap<>(); |
| static { |
| EAP_TYPE_STRING.put(EAP_IDENTITY, "Identity"); |
| EAP_TYPE_STRING.put(EAP_NOTIFICATION, "Notification"); |
| EAP_TYPE_STRING.put(EAP_NAK, "Nak"); |
| EAP_TYPE_STRING.put(EAP_TYPE_SIM, "EAP-SIM"); |
| EAP_TYPE_STRING.put(EAP_TYPE_AKA, "EAP-AKA"); |
| EAP_TYPE_STRING.put(EAP_TYPE_MSCHAP_V2, "EAP-MSCHAP-V2"); |
| EAP_TYPE_STRING.put(EAP_TYPE_AKA_PRIME, "EAP-AKA-PRIME"); |
| } |
| |
| private static final Set<Integer> SUPPORTED_TYPES = new HashSet<>(); |
| static { |
| SUPPORTED_TYPES.add(EAP_IDENTITY); |
| SUPPORTED_TYPES.add(EAP_NOTIFICATION); |
| SUPPORTED_TYPES.add(EAP_NAK); |
| |
| // supported EAP Method types |
| SUPPORTED_TYPES.add(EAP_TYPE_SIM); |
| SUPPORTED_TYPES.add(EAP_TYPE_AKA); |
| SUPPORTED_TYPES.add(EAP_TYPE_MSCHAP_V2); |
| SUPPORTED_TYPES.add(EAP_TYPE_AKA_PRIME); |
| } |
| |
| @EapType public final int eapType; |
| public final byte[] eapTypeData; |
| |
| public static final EapData NOTIFICATION_DATA = new EapData(EAP_NOTIFICATION, new byte[0]); |
| |
| /** |
| * Constructs a new EapData instance. |
| * |
| * @param eapType the {@link EapType} for this EapData instance |
| * @param eapTypeData the Type-Data for this EapData instance |
| * @throws IllegalArgumentException if eapTypeData is null or if |
| * {@link EapData#isSupportedEapType} is false for the given eapType |
| */ |
| public EapData(@EapType int eapType, @NonNull byte[] eapTypeData) { |
| this.eapType = eapType; |
| this.eapTypeData = eapTypeData; |
| |
| validate(); |
| } |
| |
| /** |
| * Gets the length of this EapData object. |
| * |
| * @return int for the number of bytes this EapData object represents |
| */ |
| public int getLength() { |
| // length of byte-array + 1 (for 1B type field) |
| return eapTypeData.length + 1; |
| } |
| |
| /** |
| * Returns whether this instance is equal to the given Object o. |
| * |
| * @param o the Object to be tested for equality |
| * @return true iff this instance is equal to the given o |
| */ |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || !(o instanceof EapData)) { |
| return false; |
| } |
| EapData eapData = (EapData) o; |
| return eapType == eapData.eapType |
| && Arrays.equals(eapTypeData, eapData.eapTypeData); |
| } |
| |
| /** |
| * Returns the hashCode value for this instance. |
| * |
| * @return the hashCode value for this instance |
| */ |
| @Override |
| public int hashCode() { |
| return Objects.hash(eapType, Arrays.hashCode(eapTypeData)); |
| } |
| |
| /** |
| * Puts the byte-encoding for this EapData instance into the given ByteBuffer. |
| * |
| * @param b the ByteBuffer to write this EapData instance to |
| */ |
| public void encodeToByteBuffer(ByteBuffer b) { |
| b.put((byte) eapType); |
| b.put(eapTypeData); |
| } |
| |
| /** |
| * Returns whether the given eapType is a supported {@link EapType} value. |
| * |
| * @param eapType the value to be checked |
| * @return true iff the given eapType is a supported EAP Type |
| */ |
| public static boolean isSupportedEapType(int eapType) { |
| return SUPPORTED_TYPES.contains(eapType); |
| } |
| |
| private void validate() { |
| if (this.eapTypeData == null) { |
| throw new IllegalArgumentException("EapTypeData byte[] must be non-null"); |
| } |
| if (!isSupportedEapType(this.eapType)) { |
| throw new IllegalArgumentException("eapType must be be a valid @EapType value"); |
| } |
| } |
| } |