Java tutorial
/* * Licensed to Apereo under one or more contributor license * agreements. See the NOTICE file distributed with this work * for additional information regarding copyright ownership. * Apereo licenses this file to you 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 the following location: * * 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 org.jasig.cas.support.spnego.authentication.principal; import com.google.common.io.ByteSource; import org.jasig.cas.authentication.Credential; import org.jasig.cas.authentication.principal.Principal; import org.jasig.cas.support.spnego.util.SpnegoConstants; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.util.Assert; import java.io.IOException; import java.io.Serializable; import java.util.Arrays; /** * Credential that are a holder for SPNEGO init token. * * @author Arnaud Lesueur * @author Marc-Antoine Garrigue * @since 3.1 */ public final class SpnegoCredential implements Credential, Serializable { /** * Unique id for serialization. */ private static final long serialVersionUID = 84084596791289548L; private static final int NTLM_TOKEN_MAX_LENGTH = 8; private final Logger logger = LoggerFactory.getLogger(this.getClass()); /** * The SPNEGO Init Token. */ private final ByteSource initToken; /** * The SPNEGO Next Token. */ private ByteSource nextToken; /** * The Principal. */ private Principal principal; /** * The authentication type should be Kerberos or NTLM. */ private final boolean isNtlm; /** * Instantiates a new SPNEGO credential. * * @param initToken the init token */ public SpnegoCredential(final byte[] initToken) { Assert.notNull(initToken, "The initToken cannot be null."); this.initToken = ByteSource.wrap(initToken); this.isNtlm = isTokenNtlm(this.initToken); } public byte[] getInitToken() { return consumeByteSourceOrNull(this.initToken); } public byte[] getNextToken() { return consumeByteSourceOrNull(this.nextToken); } /** * Sets next token. * * @param nextToken the next token */ public void setNextToken(final byte[] nextToken) { this.nextToken = ByteSource.wrap(nextToken); } public Principal getPrincipal() { return this.principal; } public void setPrincipal(final Principal principal) { this.principal = principal; } public boolean isNtlm() { return this.isNtlm; } @Override public String getId() { return this.principal != null ? this.principal.getId() : UNKNOWN_ID; } @Override public String toString() { return getId(); } /** * Checks if is token ntlm. * * @param tokenSource the token * @return true, if token ntlm */ private boolean isTokenNtlm(final ByteSource tokenSource) { final byte[] token = consumeByteSourceOrNull(tokenSource); if (token == null || token.length < NTLM_TOKEN_MAX_LENGTH) { return false; } for (int i = 0; i < NTLM_TOKEN_MAX_LENGTH; i++) { if (SpnegoConstants.NTLMSSP_SIGNATURE[i] != token[i]) { return false; } } return true; } @Override public boolean equals(final Object obj) { if (obj == null || !obj.getClass().equals(this.getClass())) { return false; } final SpnegoCredential c = (SpnegoCredential) obj; return Arrays.equals(this.getInitToken(), c.getInitToken()) && this.principal.equals(c.getPrincipal()) && Arrays.equals(this.getNextToken(), c.getNextToken()); } @Override public int hashCode() { return Arrays.hashCode(this.getInitToken()) ^ Arrays.hashCode(this.getNextToken()) ^ this.principal.hashCode(); } /** * Read the contents of the source into a byte array. * @param source the byte array source * @return the byte[] read from the source or null */ private byte[] consumeByteSourceOrNull(final ByteSource source) { try { if (source == null || source.isEmpty()) { return null; } return source.read(); } catch (final IOException e) { logger.warn("Could not consume the byte array source", e); return null; } } }