/*
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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 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 org.opends.messages.Message;
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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.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.loggers.ErrorLogger;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.types.*;
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import org.opends.server.util.Base64;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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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 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.loggers.debug.DebugLogger.debugEnabled;
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import static org.opends.server.loggers.debug.DebugLogger.getTracer;
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import static org.opends.server.util.StaticUtils.getExceptionMessage;
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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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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The fully-qualified name of this class.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.extensions.PKCS5S2PasswordStorageScheme";
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/**
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* The number of bytes of random data to use as the salt when generating the
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* hashes.
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*/
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private static final int NUM_SALT_BYTES = 16;
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/**
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* The number of bytes the SHA-1 algorithm produces.
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*/
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private static final int SHA1_LENGTH = 32;
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/**
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* Atlassian hardcoded the number of iterations to 10000.
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*/
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private static final int iterations = 10000;
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/**
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* The factory used to generate the PKCS5S2 hashes.
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*/
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private SecretKeyFactory factory;
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/**
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* The lock used to provide thread-safe access to the message digest.
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*/
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private final Object factoryLock = new Object();
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/**
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* The secure random number generator to use to generate the salt values.
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*/
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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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/**
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* {@inheritDoc}
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*/
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@Override()
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public void initializePasswordStorageScheme(
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PKCS5S2PasswordStorageSchemeCfg configuration)
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throws ConfigException, 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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factory = 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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/**
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* {@inheritDoc}
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*/
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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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/**
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* {@inheritDoc}
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*/
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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 = createRandomSaltAndEncode(plaintext, saltBytes);
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// Append the hashed value to the salt and base64-the whole thing.
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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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/**
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* {@inheritDoc}
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*/
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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 + '}'
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+ encodePassword(plaintext));
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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 passwordMatches(ByteSequence plaintextPassword,
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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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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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final int saltLength = NUM_SALT_BYTES;
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byte[] digestBytes = new byte[SHA1_LENGTH];
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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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Message message =
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ERR_PWSCHEME_INVALID_BASE64_DECODED_STORED_PASSWORD.get(
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storedPassword.toString());
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ErrorLogger.logError(message);
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return false;
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}
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System.arraycopy(decodedBytes, 0, saltBytes, 0, saltLength);
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System.arraycopy(decodedBytes, saltLength, digestBytes, 0,
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SHA1_LENGTH);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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Message message = ERR_PWSCHEME_CANNOT_BASE64_DECODE_STORED_PASSWORD.get(
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storedPassword.toString(), String.valueOf(e));
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ErrorLogger.logError(message);
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return false;
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}
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return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
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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 supportsAuthPasswordSyntax()
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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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@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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/**
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* {@inheritDoc}
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*/
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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 = createRandomSaltAndEncode(plaintext, saltBytes);
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// Encode and return the value.
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return ByteString.valueOf(AUTH_PASSWORD_SCHEME_NAME_PKCS5S2 + '$' +
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iterations + ':' + Base64.encode(saltBytes) +
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'$' + Base64.encode(digestBytes));
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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 authPasswordMatches(ByteSequence plaintextPassword,
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String authInfo, String authValue)
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{
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byte[] saltBytes;
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byte[] digestBytes;
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int iterations;
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try
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{
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int pos = 0;
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int length = authInfo.length();
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while (pos < length && authInfo.charAt(pos) != ':')
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{
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pos++;
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}
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if (pos >= (length - 1) || pos == 0)
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throw new Exception();
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iterations = Integer.parseInt(authInfo.substring(0, pos));
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saltBytes = Base64.decode(authInfo.substring(pos + 1));
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digestBytes = Base64.decode(authValue);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return false;
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}
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return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
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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 isReversible()
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{
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return false;
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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 ByteString getPlaintextValue(ByteSequence storedPassword)
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throws DirectoryException
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{
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Message message =
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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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/**
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* {@inheritDoc}
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*/
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@Override()
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public ByteString getAuthPasswordPlaintextValue(String authInfo,
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String authValue)
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throws DirectoryException
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{
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Message message =
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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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/**
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* {@inheritDoc}
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*/
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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
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* a password with the server offline (e.g., when setting the initial root
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* 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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*
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* @return The encoded password string, including the scheme name in curly
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* braces.
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*
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* @throws org.opends.server.types.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;
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try
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{
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SecureRandom.getInstance(SECURE_PRNG_SHA1).nextBytes(saltBytes);
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char[] plaintextChars = Arrays.toString(passwordBytes).toCharArray();
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KeySpec spec = new PBEKeySpec(plaintextChars, saltBytes,iterations,
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SHA1_LENGTH * 8);
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digestBytes = SecretKeyFactory
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.getInstance(MESSAGE_DIGEST_ALGORITHM_PBKDF2)
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.generateSecret(spec).getEncoded();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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Message message = ERR_PWSCHEME_CANNOT_ENCODE_PASSWORD.get(
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CLASS_NAME, getExceptionMessage(e));
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throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
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message, e);
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}
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// Append the hashed value to the salt and base64-the whole thing.
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byte[] hashPlusSalt = concatenateSaltPlusHash(saltBytes, digestBytes);
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return "{" + STORAGE_SCHEME_NAME_PKCS5S2 + "}" +
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Base64.encode(hashPlusSalt);
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}
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private boolean encodeAndMatch(ByteSequence plaintext,
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byte[] saltBytes, byte[] digestBytes, int iterations)
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{
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byte[] userDigestBytes;
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try
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{
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userDigestBytes = encodeWithSalt(plaintext, saltBytes, iterations);
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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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return Arrays.equals(digestBytes, userDigestBytes);
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}
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private byte[] createRandomSaltAndEncode(ByteSequence plaintext, byte[] saltBytes) throws DirectoryException {
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byte[] digestBytes;
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synchronized(factoryLock)
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{
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random.nextBytes(saltBytes);
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digestBytes = encodeWithSalt(plaintext, saltBytes, iterations);
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}
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return digestBytes;
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}
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private byte[] encodeWithSalt(ByteSequence plaintext, byte[] saltBytes, int iterations) throws DirectoryException {
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byte[] digestBytes;
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char[] plaintextChars = null;
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try
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{
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plaintextChars = plaintext.toString().toCharArray();
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KeySpec spec = new PBEKeySpec(
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plaintextChars, saltBytes,
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iterations, SHA1_LENGTH * 8);
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digestBytes = factory.generateSecret(spec).getEncoded();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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Message message = ERR_PWSCHEME_CANNOT_ENCODE_PASSWORD.get(
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CLASS_NAME, getExceptionMessage(e));
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throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
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message, e);
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}
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finally
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{
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if (plaintextChars != null)
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{
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Arrays.fill(plaintextChars, '0');
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}
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}
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return digestBytes;
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}
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private static byte[] concatenateSaltPlusHash(byte[] saltBytes, byte[] digestBytes) {
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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,
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digestBytes.length);
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return hashPlusSalt;
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}
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}
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