/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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 2014-2015 ForgeRock AS.
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* Portions Copyright Emidio Stani & Andrea Stani
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*/
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package org.opends.server.extensions;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.security.spec.KeySpec;
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import java.util.Arrays;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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import org.forgerock.i18n.LocalizableMessage;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.opendj.ldap.ResultCode;
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import org.opends.server.admin.std.server.PKCS5S2PasswordStorageSchemeCfg;
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import org.opends.server.api.PasswordStorageScheme;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.InitializationException;
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import org.opends.server.util.Base64;
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import static org.opends.messages.ExtensionMessages.*;
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import static org.opends.server.extensions.ExtensionsConstants.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class defines a Directory Server password storage scheme based on the
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* Atlassian PBKF2-base hash algorithm. This is a one-way digest algorithm
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* so there is no way to retrieve the original clear-text version of the
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* password from the hashed value (although this means that it is not suitable
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* for things that need the clear-text password like DIGEST-MD5). Unlike
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* the other PBKF2-base scheme, this implementation uses a fixed number of
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* iterations.
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*/
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public class PKCS5S2PasswordStorageScheme
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extends PasswordStorageScheme<PKCS5S2PasswordStorageSchemeCfg>
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{
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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/** The fully-qualified name of this class. */
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private static final String CLASS_NAME = "org.opends.server.extensions.PKCS5S2PasswordStorageScheme";
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/** The number of bytes of random data to use as the salt when generating the hashes. */
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private static final int NUM_SALT_BYTES = 16;
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/** The number of bytes the SHA-1 algorithm produces. */
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private static final int SHA1_LENGTH = 32;
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/** Atlassian hardcoded the number of iterations to 10000. */
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private static final int iterations = 10000;
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/** The secure random number generator to use to generate the salt values. */
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private SecureRandom random;
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/**
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* Creates a new instance of this password storage scheme. Note that no
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* initialization should be performed here, as all initialization should be
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* done in the <CODE>initializePasswordStorageScheme</CODE> method.
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*/
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public PKCS5S2PasswordStorageScheme()
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{
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super();
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}
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/** {@inheritDoc} */
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@Override
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public void initializePasswordStorageScheme(PKCS5S2PasswordStorageSchemeCfg configuration)
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throws InitializationException
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{
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try
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{
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random = SecureRandom.getInstance(SECURE_PRNG_SHA1);
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// Just try to verify if the algorithm is supported
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SecretKeyFactory.getInstance(MESSAGE_DIGEST_ALGORITHM_PBKDF2);
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}
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catch (NoSuchAlgorithmException e)
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{
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throw new InitializationException(null);
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}
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}
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/** {@inheritDoc} */
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@Override
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public String getStorageSchemeName()
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{
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return STORAGE_SCHEME_NAME_PKCS5S2;
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}
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/** {@inheritDoc} */
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@Override
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public ByteString encodePassword(ByteSequence plaintext)
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throws DirectoryException
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{
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] digestBytes = encodeWithRandomSalt(plaintext, saltBytes,random);
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byte[] hashPlusSalt = concatenateSaltPlusHash(saltBytes, digestBytes);
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return ByteString.valueOf(Base64.encode(hashPlusSalt));
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}
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/** {@inheritDoc} */
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@Override
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public ByteString encodePasswordWithScheme(ByteSequence plaintext)
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throws DirectoryException
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{
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return ByteString.valueOf('{' + STORAGE_SCHEME_NAME_PKCS5S2 + '}' + encodePassword(plaintext));
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}
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/** {@inheritDoc} */
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@Override
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public boolean passwordMatches(ByteSequence plaintextPassword, ByteSequence storedPassword)
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{
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// Base64-decode the value and take the first 16 bytes as the salt.
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try
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{
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String stored = storedPassword.toString();
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byte[] decodedBytes = Base64.decode(stored);
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if (decodedBytes.length != NUM_SALT_BYTES + SHA1_LENGTH)
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{
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logger.error(ERR_PWSCHEME_INVALID_BASE64_DECODED_STORED_PASSWORD.get(storedPassword.toString()));
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return false;
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}
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final int saltLength = NUM_SALT_BYTES;
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final byte[] digestBytes = new byte[SHA1_LENGTH];
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final byte[] saltBytes = new byte[saltLength];
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System.arraycopy(decodedBytes, 0, saltBytes, 0, saltLength);
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System.arraycopy(decodedBytes, saltLength, digestBytes, 0, SHA1_LENGTH);
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return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
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}
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catch (Exception e)
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{
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logger.traceException(e);
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logger.error(ERR_PWSCHEME_CANNOT_BASE64_DECODE_STORED_PASSWORD.get(storedPassword.toString(), String.valueOf(e)));
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return false;
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}
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}
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/** {@inheritDoc} */
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@Override
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public boolean supportsAuthPasswordSyntax()
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{
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return true;
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}
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/** {@inheritDoc} */
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@Override
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public String getAuthPasswordSchemeName()
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{
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return AUTH_PASSWORD_SCHEME_NAME_PKCS5S2;
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}
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/** {@inheritDoc} */
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@Override
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public ByteString encodeAuthPassword(ByteSequence plaintext)
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throws DirectoryException
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{
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] digestBytes = encodeWithRandomSalt(plaintext, saltBytes,random);
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// Encode and return the value.
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return ByteString.valueOf(AUTH_PASSWORD_SCHEME_NAME_PKCS5S2 + '$' + iterations
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+ ':' + Base64.encode(saltBytes) + '$' + Base64.encode(digestBytes));
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}
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/** {@inheritDoc} */
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@Override
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public boolean authPasswordMatches(ByteSequence plaintextPassword, String authInfo, String authValue)
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{
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try
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{
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int pos = authInfo.indexOf(':');
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if (pos == -1)
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{
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throw new Exception();
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}
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int iterations = Integer.parseInt(authInfo.substring(0, pos));
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byte[] saltBytes = Base64.decode(authInfo.substring(pos + 1));
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byte[] digestBytes = Base64.decode(authValue);
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return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
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}
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catch (Exception e)
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{
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logger.traceException(e);
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return false;
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}
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}
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/** {@inheritDoc} */
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@Override
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public boolean isReversible()
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{
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return false;
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}
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/** {@inheritDoc} */
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@Override
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public ByteString getPlaintextValue(ByteSequence storedPassword)
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throws DirectoryException
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{
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LocalizableMessage message = ERR_PWSCHEME_NOT_REVERSIBLE.get(STORAGE_SCHEME_NAME_PKCS5S2);
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throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message);
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}
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/** {@inheritDoc} */
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@Override
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public ByteString getAuthPasswordPlaintextValue(String authInfo, String authValue)
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throws DirectoryException
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{
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LocalizableMessage message = ERR_PWSCHEME_NOT_REVERSIBLE.get(AUTH_PASSWORD_SCHEME_NAME_PKCS5S2);
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throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message);
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}
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/** {@inheritDoc} */
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@Override
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public boolean isStorageSchemeSecure()
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{
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return true;
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}
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/**
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* Generates an encoded password string from the given clear-text password.
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* This method is primarily intended for use when it is necessary to generate a password with the server
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* offline (e.g., when setting the initial root user password).
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*
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* @param passwordBytes The bytes that make up the clear-text password.
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* @return The encoded password string, including the scheme name in curly braces.
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* @throws DirectoryException If a problem occurs during processing.
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*/
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public static String encodeOffline(byte[] passwordBytes)
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throws DirectoryException
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{
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] digestBytes = encodeWithRandomSalt(ByteString.wrap(passwordBytes), saltBytes);
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byte[] hashPlusSalt = concatenateSaltPlusHash(saltBytes, digestBytes);
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return '{' + STORAGE_SCHEME_NAME_PKCS5S2 + '}' + Base64.encode(hashPlusSalt);
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}
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private static byte[] encodeWithRandomSalt(ByteString plaintext, byte[] saltBytes)
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throws DirectoryException
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{
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try
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{
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final SecureRandom random = SecureRandom.getInstance(SECURE_PRNG_SHA1);
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return encodeWithRandomSalt(plaintext, saltBytes, random);
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}
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catch (DirectoryException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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throw cannotEncodePassword(e);
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}
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}
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private static byte[] encodeWithSalt(ByteSequence plaintext, byte[] saltBytes, int iterations)
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throws DirectoryException
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{
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final char[] plaintextChars = plaintext.toString().toCharArray();
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try
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{
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final SecretKeyFactory factory = SecretKeyFactory.getInstance(MESSAGE_DIGEST_ALGORITHM_PBKDF2);
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KeySpec spec = new PBEKeySpec(plaintextChars, saltBytes, iterations, SHA1_LENGTH * 8);
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return factory.generateSecret(spec).getEncoded();
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}
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catch (Exception e)
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{
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throw cannotEncodePassword(e);
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}
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finally
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{
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Arrays.fill(plaintextChars, '0');
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}
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}
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private boolean encodeAndMatch(ByteSequence plaintext, byte[] saltBytes, byte[] digestBytes, int iterations)
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{
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try
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{
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final byte[] userDigestBytes = encodeWithSalt(plaintext, saltBytes, iterations);
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return Arrays.equals(digestBytes, userDigestBytes);
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}
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catch (Exception e)
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{
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return false;
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}
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}
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private static byte[] encodeWithRandomSalt(ByteSequence plaintext, byte[] saltBytes, SecureRandom random)
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throws DirectoryException
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{
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random.nextBytes(saltBytes);
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return encodeWithSalt(plaintext, saltBytes, iterations);
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}
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private static DirectoryException cannotEncodePassword(Exception e)
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{
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logger.traceException(e);
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LocalizableMessage message = ERR_PWSCHEME_CANNOT_ENCODE_PASSWORD.get(CLASS_NAME, getExceptionMessage(e));
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return new DirectoryException(DirectoryServer.getServerErrorResultCode(), message, e);
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}
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private static byte[] concatenateSaltPlusHash(byte[] saltBytes, byte[] digestBytes) {
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final byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(saltBytes, 0, hashPlusSalt, 0, NUM_SALT_BYTES);
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System.arraycopy(digestBytes, 0, hashPlusSalt, NUM_SALT_BYTES, digestBytes.length);
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return hashPlusSalt;
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}
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}
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