com.hierynomus.spnego.SpnegoToken Maven / Gradle / Ivy
/*
* Copyright (C)2016 - SMBJ Contributors
*
* 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.hierynomus.spnego;
import com.hierynomus.asn1.ASN1OutputStream;
import com.hierynomus.asn1.encodingrules.der.DEREncoder;
import com.hierynomus.asn1.types.ASN1Object;
import com.hierynomus.asn1.types.ASN1Tag;
import com.hierynomus.asn1.types.constructed.ASN1Sequence;
import com.hierynomus.asn1.types.constructed.ASN1TaggedObject;
import com.hierynomus.protocol.commons.buffer.Buffer;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static com.hierynomus.spnego.ObjectIdentifiers.SPNEGO;
abstract class SpnegoToken {
private int tokenTagNo;
private String tokenName;
public SpnegoToken(int tokenTagNo, String tokenName) {
this.tokenTagNo = tokenTagNo;
this.tokenName = tokenName;
}
protected void writeGss(Buffer buffer, ASN1Object negToken) throws IOException {
ASN1TaggedObject negotiationToken = new ASN1TaggedObject(ASN1Tag.contextSpecific(tokenTagNo).constructed(), negToken);
List implicitSeqGssApi = new ArrayList<>();
implicitSeqGssApi.add(SPNEGO);
implicitSeqGssApi.add(negotiationToken);
ASN1TaggedObject token = new ASN1TaggedObject(ASN1Tag.application(0), new ASN1Sequence(implicitSeqGssApi), false);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (ASN1OutputStream out = new ASN1OutputStream(new DEREncoder(), baos)) {
out.writeObject(token);
}
buffer.putRawBytes(baos.toByteArray());
}
protected void parseSpnegoToken(ASN1Object spnegoToken) throws SpnegoException {
if (!(spnegoToken instanceof ASN1TaggedObject) || ((ASN1TaggedObject) spnegoToken).getTagNo() != tokenTagNo) {
throw new SpnegoException("Expected to find the " + tokenName + " (CHOICE [" + tokenTagNo + "]) header, not: " + spnegoToken);
}
ASN1Object negToken = ((ASN1TaggedObject) spnegoToken).getObject();
if (!(negToken instanceof ASN1Sequence)) {
throw new SpnegoException("Expected a " + tokenName + " (SEQUENCE), not: " + negToken);
}
for (ASN1Object asn1Object : (ASN1Sequence) negToken) {
if (!(asn1Object instanceof ASN1TaggedObject)) {
throw new SpnegoException("Expected an ASN.1 TaggedObject as " + tokenName + " contents, not: " + asn1Object);
}
ASN1TaggedObject asn1TaggedObject = (ASN1TaggedObject) asn1Object;
parseTagged(asn1TaggedObject);
}
}
protected abstract void parseTagged(ASN1TaggedObject asn1TaggedObject) throws SpnegoException;
}