/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import org.opends.messages.Message;
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import java.util.List;
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import java.util.Set;
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import org.opends.server.api.PasswordValidator;
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import org.opends.server.config.ConfigException;
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import org.opends.server.types.*;
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import org.opends.server.util.LevenshteinDistance;
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import org.opends.server.admin.std.server.SimilarityBasedPasswordValidatorCfg;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import static org.opends.messages.ExtensionMessages.*;
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import org.opends.messages.MessageBuilder;
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/**
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* This class provides a password validator that can ensure that the provided
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* password meets minimum similarity requirements.
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*/
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public class SimilarityBasedPasswordValidator extends
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PasswordValidator<SimilarityBasedPasswordValidatorCfg> implements
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ConfigurationChangeListener<SimilarityBasedPasswordValidatorCfg>
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{
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// The current configuration for this password validator.
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private SimilarityBasedPasswordValidatorCfg currentConfig;
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/**
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* Creates a new instance of this password validator.
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*/
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public SimilarityBasedPasswordValidator()
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{
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super();
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// All initialization must be done in the initializePasswordValidator
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// method.
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void initializePasswordValidator(
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SimilarityBasedPasswordValidatorCfg configuration)
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throws ConfigException, InitializationException
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{
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configuration.addSimilarityBasedChangeListener(this);
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currentConfig = configuration;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void finalizePasswordValidator()
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{
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currentConfig.removeSimilarityBasedChangeListener(this);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean passwordIsAcceptable(ByteString newPassword,
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Set<ByteString> currentPasswords,
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Operation operation, Entry userEntry,
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MessageBuilder invalidReason) {
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int minDifference = currentConfig.getMinPasswordDifference();
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ByteString passwd = newPassword == null
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? ByteString.empty()
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: newPassword;
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if (currentPasswords == null || currentPasswords.size() == 0) {
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// This validator requires access to at least one current password.
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// If we don't have a current password, then we can't validate it, so
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// we'll have to assume it is OK. Ideally, the password policy should be
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// configured to always require the current password, but even then the
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// current password probably won't be availble during an administrative
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// password reset.
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return true;
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}
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for (ByteString bs : currentPasswords) {
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if (bs == null) {
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continue;
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}
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int ldistance = LevenshteinDistance.calculate(passwd.toString(),
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bs.toString());
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if (ldistance < minDifference) {
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invalidReason.append(ERR_PWDIFFERENCEVALIDATOR_TOO_SMALL.get(
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minDifference));
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return false;
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}
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}
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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SimilarityBasedPasswordValidatorCfg configuration,
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List<Message> unacceptableReasons)
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{
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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SimilarityBasedPasswordValidatorCfg configuration)
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{
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currentConfig = configuration;
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return new ConfigChangeResult(ResultCode.SUCCESS, false);
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}
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}
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