/*
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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 2006-2010 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import java.security.MessageDigest;
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import java.util.Arrays;
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import java.util.Random;
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import org.opends.messages.Message;
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import org.opends.server.admin.std.server.SaltedSHA1PasswordStorageSchemeCfg;
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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 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.*;
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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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* SHA-1 algorithm defined in FIPS 180-1. 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). The values
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* that it generates are also salted, which protects against dictionary attacks.
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* It does this by generating a 64-bit random salt which is appended to the
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* clear-text value. A SHA-1 hash is then generated based on this, the salt is
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* appended to the hash, and then the entire value is base64-encoded.
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*/
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public class SaltedSHA1PasswordStorageScheme
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extends PasswordStorageScheme<SaltedSHA1PasswordStorageSchemeCfg>
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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.SaltedSHA1PasswordStorageScheme";
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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 = 8;
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// The number of bytes SHA algorithm produces
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private static final int SHA1_LENGTH = 20;
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// The message digest that will actually be used to generate the SHA-1 hashes.
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private MessageDigest messageDigest;
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// The lock used to provide threadsafe access to the message digest.
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private Object digestLock;
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// The secure random number generator to use to generate the salt values.
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private Random 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 SaltedSHA1PasswordStorageScheme()
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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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SaltedSHA1PasswordStorageSchemeCfg 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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messageDigest = MessageDigest.getInstance(MESSAGE_DIGEST_ALGORITHM_SHA_1);
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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_INITIALIZE_MESSAGE_DIGEST.get(
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MESSAGE_DIGEST_ALGORITHM_SHA_1, String.valueOf(e));
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throw new InitializationException(message, e);
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}
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digestLock = new Object();
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random = new Random();
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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_SALTED_SHA_1;
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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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int plainBytesLength = plaintext.length();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plainBytesLength + NUM_SALT_BYTES];
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plaintext.copyTo(plainPlusSalt);
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byte[] digestBytes;
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synchronized (digestLock)
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{
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plainBytesLength,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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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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}
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// Append the salt to the hashed value and base64-the whole thing.
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byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
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System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
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NUM_SALT_BYTES);
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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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StringBuilder buffer = new StringBuilder();
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buffer.append('{');
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buffer.append(STORAGE_SCHEME_NAME_SALTED_SHA_1);
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buffer.append('}');
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int plainBytesLength = plaintext.length();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plainBytesLength + NUM_SALT_BYTES];
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plaintext.copyTo(plainPlusSalt);
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byte[] digestBytes;
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synchronized (digestLock)
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{
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plainBytesLength,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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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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}
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// Append the salt to the hashed value and base64-the whole thing.
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byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
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System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
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NUM_SALT_BYTES);
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buffer.append(Base64.encode(hashPlusSalt));
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return ByteString.valueOf(buffer.toString());
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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 stored value and take the last 8 bytes as the salt.
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byte[] saltBytes;
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byte[] digestBytes = new byte[SHA1_LENGTH];
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int saltLength = 0;
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try
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{
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byte[] decodedBytes = Base64.decode(storedPassword.toString());
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saltLength = decodedBytes.length - SHA1_LENGTH;
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saltBytes = new byte[saltLength];
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System.arraycopy(decodedBytes, 0, digestBytes, 0, SHA1_LENGTH);
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System.arraycopy(decodedBytes, SHA1_LENGTH, saltBytes, 0,
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saltLength);
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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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// Use the salt to generate a digest based on the provided plain-text value.
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int plainBytesLength = plaintextPassword.length();
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byte[] plainPlusSalt = new byte[plainBytesLength + saltLength];
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plaintextPassword.copyTo(plainPlusSalt);
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System.arraycopy(saltBytes, 0,plainPlusSalt, plainBytesLength,
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saltLength);
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byte[] userDigestBytes;
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synchronized (digestLock)
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{
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try
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{
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userDigestBytes = messageDigest.digest(plainPlusSalt);
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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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}
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return Arrays.equals(digestBytes, userDigestBytes);
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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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// This storage scheme does support the authentication password syntax.
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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_SALTED_SHA_1;
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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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int plaintextLength = plaintext.length();
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byte[] saltBytes = new byte[NUM_SALT_BYTES];
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byte[] plainPlusSalt = new byte[plaintextLength + NUM_SALT_BYTES];
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plaintext.copyTo(plainPlusSalt);
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byte[] digestBytes;
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synchronized (digestLock)
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{
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try
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{
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// Generate the salt and put in the plain+salt array.
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random.nextBytes(saltBytes);
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System.arraycopy(saltBytes,0, plainPlusSalt, plaintextLength,
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NUM_SALT_BYTES);
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// Create the hash from the concatenated value.
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digestBytes = messageDigest.digest(plainPlusSalt);
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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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}
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// Encode and return the value.
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StringBuilder authPWValue = new StringBuilder();
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authPWValue.append(AUTH_PASSWORD_SCHEME_NAME_SALTED_SHA_1);
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authPWValue.append('$');
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authPWValue.append(Base64.encode(saltBytes));
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authPWValue.append('$');
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authPWValue.append(Base64.encode(digestBytes));
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return ByteString.valueOf(authPWValue.toString());
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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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try
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{
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saltBytes = Base64.decode(authInfo);
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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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int plainBytesLength = plaintextPassword.length();
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byte[] plainPlusSaltBytes = new byte[plainBytesLength + saltBytes.length];
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plaintextPassword.copyTo(plainPlusSaltBytes);
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System.arraycopy(saltBytes, 0, plainPlusSaltBytes, plainBytesLength,
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saltBytes.length);
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synchronized (digestLock)
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{
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return Arrays.equals(digestBytes,
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messageDigest.digest(plainPlusSaltBytes));
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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 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_SALTED_SHA_1);
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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_SALTED_SHA_1);
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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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// SHA-1 should be considered secure.
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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 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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new Random().nextBytes(saltBytes);
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byte[] passwordPlusSalt = new byte[passwordBytes.length + NUM_SALT_BYTES];
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System.arraycopy(passwordBytes, 0, passwordPlusSalt, 0,
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passwordBytes.length);
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System.arraycopy(saltBytes, 0, passwordPlusSalt, passwordBytes.length,
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NUM_SALT_BYTES);
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MessageDigest messageDigest;
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try
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{
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messageDigest = MessageDigest.getInstance(MESSAGE_DIGEST_ALGORITHM_SHA_1);
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}
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catch (Exception e)
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{
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Message message = ERR_PWSCHEME_CANNOT_INITIALIZE_MESSAGE_DIGEST.get(
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MESSAGE_DIGEST_ALGORITHM_SHA_1, String.valueOf(e));
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throw new DirectoryException(ResultCode.OTHER, message, e);
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}
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byte[] digestBytes = messageDigest.digest(passwordPlusSalt);
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byte[] digestPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
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System.arraycopy(digestBytes, 0, digestPlusSalt, 0, digestBytes.length);
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System.arraycopy(saltBytes, 0, digestPlusSalt, digestBytes.length,
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NUM_SALT_BYTES);
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return "{" + STORAGE_SCHEME_NAME_SALTED_SHA_1 + "}" +
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Base64.encode(digestPlusSalt);
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}
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}
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