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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.internal.net.ipsec.ike.message;
import android.net.ipsec.ike.exceptions.IkeProtocolException;
import com.android.internal.net.ipsec.ike.exceptions.AuthenticationFailedException;
import java.io.ByteArrayInputStream;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
/**
* IkeCertX509CertPayload represents a Certificate Payload carrying a DER-encoded X.509 certificate.
*
* <p>When sending multiple certificates, IKE library should put certificates in order starting with
* the target certificate and ending with a certificate issued by the trust anchor. When receiving
* an inbound packet, IKE library should take first certificate as the target certificate but treat
* the rest unordered.
*
* @see <a href="https://tools.ietf.org/html/rfc7296#section-3.6">RFC 7296, Internet Key Exchange
* Protocol Version 2 (IKEv2)</a>
*/
public final class IkeCertX509CertPayload extends IkeCertPayload {
public final X509Certificate certificate;
/** Construct IkeCertX509CertPayload for an outbound packet. */
public IkeCertX509CertPayload(X509Certificate x509Certificate) {
super(CERTIFICATE_ENCODING_X509_CERT_SIGNATURE);
certificate = x509Certificate;
}
protected IkeCertX509CertPayload(boolean critical, byte[] certData)
throws IkeProtocolException {
super(critical, CERTIFICATE_ENCODING_X509_CERT_SIGNATURE);
try {
CertificateFactory factory = CertificateFactory.getInstance("X.509");
certificate =
(X509Certificate)
factory.generateCertificate(new ByteArrayInputStream(certData));
// Parsing InputStream error
if (certificate == null) {
throw new AuthenticationFailedException(
"No certificate parsed from received data.");
}
if (certificate.getEncoded().length < certData.length) {
throw new AuthenticationFailedException("Unexpected trailing bytes.");
}
} catch (GeneralSecurityException e) {
throw new AuthenticationFailedException(e);
}
}
/**
* Encode IkeCertX509CertPayload 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((byte) certEncodingType);
try {
byteBuffer.put(certificate.getEncoded());
} catch (CertificateEncodingException e) {
// No certificate to encode.
}
}
/**
* Get entire payload length.
*
* @return entire payload length.
*/
@Override
protected int getPayloadLength() {
try {
return GENERIC_HEADER_LENGTH + CERT_ENCODING_LEN + certificate.getEncoded().length;
} catch (CertificateEncodingException e) {
return GENERIC_HEADER_LENGTH + CERT_ENCODING_LEN;
}
}
/**
* Return the payload type as a String.
*
* @return the payload type as a String.
*/
@Override
public String getTypeString() {
return "Cert(X509)";
}
}
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