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/*
* Copyright (C) 2018 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.ipsec.ike.message;
import android.net.ipsec.ike.IkeFqdnIdentification;
import android.net.ipsec.ike.IkeIdentification;
import android.net.ipsec.ike.IkeIpv4AddrIdentification;
import android.net.ipsec.ike.IkeIpv6AddrIdentification;
import android.net.ipsec.ike.IkeKeyIdIdentification;
import android.net.ipsec.ike.IkeRfc822AddrIdentification;
import android.net.ipsec.ike.exceptions.IkeProtocolException;
import com.android.internal.net.ipsec.ike.exceptions.AuthenticationFailedException;
import com.android.internal.net.ipsec.ike.exceptions.InvalidSyntaxException;
import java.nio.ByteBuffer;
/**
* IkeIdPayload represents an Identification Initiator Payload or an Identification Responder
* Payload.
*
* <p>Identification Initiator Payload and Identification Responder Payload have same format but
* different payload type.
*
* @see <a href="https://tools.ietf.org/html/rfc7296#section-3.5">RFC 7296, Internet Key Exchange
* Protocol Version 2 (IKEv2)</a>
*/
public final class IkeIdPayload extends IkePayload {
// Length of ID Payload header in octets.
private static final int ID_HEADER_LEN = 4;
// Length of reserved field in octets.
private static final int ID_HEADER_RESERVED_LEN = 3;
public final IkeIdentification ikeId;
/**
* Construct IkeIdPayload for received IKE packet in the context of {@link IkePayloadFactory}.
*
* @param critical indicates if it is a critical payload.
* @param payloadBody payload body in byte array.
* @param isInitiator indicates whether this payload contains the ID of IKE initiator or IKE
* responder.
* @throws IkeProtocolException for decoding error.
*/
IkeIdPayload(boolean critical, byte[] payloadBody, boolean isInitiator)
throws IkeProtocolException {
super((isInitiator ? PAYLOAD_TYPE_ID_INITIATOR : PAYLOAD_TYPE_ID_RESPONDER), critical);
// TODO: b/119791832 Add helper method for checking payload body length in superclass.
if (payloadBody.length <= ID_HEADER_LEN) {
throw new InvalidSyntaxException(getTypeString() + " is too short.");
}
ByteBuffer inputBuffer = ByteBuffer.wrap(payloadBody);
int idType = Byte.toUnsignedInt(inputBuffer.get());
// Skip reserved field
inputBuffer.get(new byte[ID_HEADER_RESERVED_LEN]);
byte[] idData = new byte[payloadBody.length - ID_HEADER_LEN];
inputBuffer.get(idData);
switch (idType) {
case IkeIdentification.ID_TYPE_IPV4_ADDR:
ikeId = new IkeIpv4AddrIdentification(idData);
return;
case IkeIdentification.ID_TYPE_FQDN:
ikeId = new IkeFqdnIdentification(idData);
return;
case IkeIdentification.ID_TYPE_RFC822_ADDR:
ikeId = new IkeRfc822AddrIdentification(idData);
return;
case IkeIdentification.ID_TYPE_IPV6_ADDR:
ikeId = new IkeIpv6AddrIdentification(idData);
return;
case IkeIdentification.ID_TYPE_DER_ASN1_DN: // Fall through
case IkeIdentification.ID_TYPE_DER_ASN1_GN:
throw new UnsupportedOperationException("ID type is not supported currently.");
case IkeIdentification.ID_TYPE_KEY_ID:
ikeId = new IkeKeyIdIdentification(idData);
return;
default:
throw new AuthenticationFailedException("Unsupported ID type: " + idType);
}
}
/**
* Construct IkeIdPayload for an outbound IKE packet.
*
* @param isInitiator indicates whether this payload contains the ID of IKE initiator or IKE
* responder.
* @param ikeId the IkeIdentification.
*/
public IkeIdPayload(boolean isInitiator, IkeIdentification ikeId) {
super((isInitiator ? PAYLOAD_TYPE_ID_INITIATOR : PAYLOAD_TYPE_ID_RESPONDER), false);
this.ikeId = ikeId;
}
/**
* Get encoded ID payload body for building or validating an Auth Payload.
*
* @return the byte array of encoded ID payload body.
*/
public byte[] getEncodedPayloadBody() {
ByteBuffer byteBuffer = ByteBuffer.allocate(getPayloadLength() - GENERIC_HEADER_LENGTH);
byteBuffer
.put((byte) ikeId.idType)
.put(new byte[ID_HEADER_RESERVED_LEN])
.put(ikeId.getEncodedIdData());
return byteBuffer.array();
}
/**
* Encode Identification Payload to ByteBuffer.
*
* @param nextPayload type of payload that follows this payload.
* @param byteBuffer destination ByteBuffer that stores encoded payload.
*/
@Override
protected void encodeToByteBuffer(@PayloadType int nextPayload, ByteBuffer byteBuffer) {
encodePayloadHeaderToByteBuffer(nextPayload, getPayloadLength(), byteBuffer);
byteBuffer.put(getEncodedPayloadBody());
}
/**
* Get entire payload length.
*
* @return entire payload length.
*/
@Override
protected int getPayloadLength() {
return GENERIC_HEADER_LENGTH + ID_HEADER_LEN + ikeId.getEncodedIdData().length;
}
/**
* Return the payload type as a String.
*
* @return the payload type as a String.
*/
@Override
public String getTypeString() {
switch (payloadType) {
case PAYLOAD_TYPE_ID_INITIATOR:
return "IDi";
case PAYLOAD_TYPE_ID_RESPONDER:
return "IDr";
default:
// Won't reach here.
throw new IllegalArgumentException(
"Invalid Payload Type for Identification Payload.");
}
}
}
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