From da280307edefe3dce5d3836f502c9fc3daa4ce6f Mon Sep 17 00:00:00 2001
From: Jean-Noel Rouvignac <jean-noel.rouvignac@forgerock.com>
Date: Fri, 25 Jul 2014 08:23:32 +0000
Subject: [PATCH] Code cleanup for password storage schemes. Used AutoRefactor. Reduced variable scopes.
---
opends/src/server/org/opends/server/extensions/PBKDF2PasswordStorageScheme.java | 368 +++++++++++++++-------------------------------------
1 files changed, 105 insertions(+), 263 deletions(-)
diff --git a/opends/src/server/org/opends/server/extensions/PBKDF2PasswordStorageScheme.java b/opends/src/server/org/opends/server/extensions/PBKDF2PasswordStorageScheme.java
index 70dc632..56662cb 100644
--- a/opends/src/server/org/opends/server/extensions/PBKDF2PasswordStorageScheme.java
+++ b/opends/src/server/org/opends/server/extensions/PBKDF2PasswordStorageScheme.java
@@ -21,15 +21,15 @@
* CDDL HEADER END
*
*
- * Copyright 2013 ForgeRock AS.
+ * Copyright 2013-2014 ForgeRock AS.
*/
package org.opends.server.extensions;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
+import java.security.spec.KeySpec;
import java.util.Arrays;
import java.util.List;
-import java.security.spec.KeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
@@ -48,7 +48,7 @@
import static org.opends.messages.ExtensionMessages.*;
import static org.opends.server.extensions.ExtensionsConstants.*;
import static org.opends.server.loggers.debug.DebugLogger.*;
-import static org.opends.server.util.StaticUtils.getExceptionMessage;
+import static org.opends.server.util.StaticUtils.*;
/**
* This class defines a Directory Server password storage scheme based on the
@@ -62,14 +62,10 @@
extends PasswordStorageScheme<PBKDF2PasswordStorageSchemeCfg>
implements ConfigurationChangeListener<PBKDF2PasswordStorageSchemeCfg>
{
- /**
- * The tracer object for the debug logger.
- */
+ /** The tracer object for the debug logger. */
private static final DebugTracer TRACER = getTracer();
- /**
- * The fully-qualified name of this class.
- */
+ /** The fully-qualified name of this class. */
private static final String CLASS_NAME =
"org.opends.server.extensions.PBKDF2PasswordStorageScheme";
@@ -80,19 +76,19 @@
*/
private static final int NUM_SALT_BYTES = 8;
- // The number of bytes the SHA-1 algorithm produces
+ /** The number of bytes the SHA-1 algorithm produces. */
private static final int SHA1_LENGTH = 20;
- // The factory used to generate the PBKDF2 hashes.
+ /** The factory used to generate the PBKDF2 hashes. */
private SecretKeyFactory factory;
- // The lock used to provide threadsafe access to the message digest.
- private Object factoryLock;
+ /** The lock used to provide thread-safe access to the message digest. */
+ private final Object factoryLock = new Object();
- // The secure random number generator to use to generate the salt values.
+ /** The secure random number generator to use to generate the salt values. */
private SecureRandom random;
- // The current configuration for this storage scheme.
+ /** The current configuration for this storage scheme. */
private volatile PBKDF2PasswordStorageSchemeCfg config;
@@ -106,17 +102,12 @@
super();
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public void initializePasswordStorageScheme(
PBKDF2PasswordStorageSchemeCfg configuration)
throws ConfigException, InitializationException
{
- factoryLock = new Object();
try
{
random = SecureRandom.getInstance(SECURE_PRNG_SHA1);
@@ -131,24 +122,17 @@
config.addPBKDF2ChangeListener(this);
}
-
-
- /**
- * {@inheritDoc}
- */
+ /** {@inheritDoc} */
+ @Override
public boolean isConfigurationChangeAcceptable(
PBKDF2PasswordStorageSchemeCfg configuration,
List<Message> unacceptableReasons)
{
- // The configuration will always be acceptable.
return true;
}
-
-
- /**
- * {@inheritDoc}
- */
+ /** {@inheritDoc} */
+ @Override
public ConfigChangeResult applyConfigurationChange(
PBKDF2PasswordStorageSchemeCfg configuration)
{
@@ -156,60 +140,22 @@
return new ConfigChangeResult(ResultCode.SUCCESS, false);
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public String getStorageSchemeName()
{
return STORAGE_SCHEME_NAME_PBKDF2;
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public ByteString encodePassword(ByteSequence plaintext)
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
- byte[] digestBytes;
- char[] plaintextChars = null;
int iterations = config.getPBKDF2Iterations();
- synchronized(factoryLock)
- {
- try
- {
- random.nextBytes(saltBytes);
-
- plaintextChars = plaintext.toString().toCharArray();
- KeySpec spec = new PBEKeySpec(plaintextChars,
- saltBytes, iterations, SHA1_LENGTH * 8);
- digestBytes = factory.generateSecret(spec).getEncoded();
- }
- catch (Exception e)
- {
- if (debugEnabled())
- {
- TRACER.debugCaught(DebugLogLevel.ERROR, e);
- }
-
- Message message = ERR_PWSCHEME_CANNOT_ENCODE_PASSWORD.get(
- CLASS_NAME, getExceptionMessage(e));
- throw new DirectoryException(DirectoryServer.getServerErrorResultCode(),
- message, e);
- }
- finally
- {
- if (plaintextChars != null)
- Arrays.fill(plaintextChars, '0');
- }
- }
+ byte[] digestBytes = getDigestBytes(plaintext, saltBytes, iterations);
// Append the salt to the hashed value and base64-the whole thing.
byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
@@ -217,64 +163,34 @@
System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
NUM_SALT_BYTES);
- StringBuilder sb = new StringBuilder();
- sb.append(Integer.toString(iterations));
- sb.append(':');
- sb.append(Base64.encode(hashPlusSalt));
- return ByteString.valueOf(sb.toString());
+ return ByteString.valueOf(iterations + ':' + Base64.encode(hashPlusSalt));
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public ByteString encodePasswordWithScheme(ByteSequence plaintext)
throws DirectoryException
{
- StringBuilder buffer = new StringBuilder();
- buffer.append('{');
- buffer.append(STORAGE_SCHEME_NAME_PBKDF2);
- buffer.append('}');
-
- buffer.append(encodePassword(plaintext));
-
- return ByteString.valueOf(buffer.toString());
+ return ByteString.valueOf('{' + STORAGE_SCHEME_NAME_PBKDF2 + '}'
+ + encodePassword(plaintext));
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public boolean passwordMatches(ByteSequence plaintextPassword,
ByteSequence storedPassword)
{
-
- // Split the iterations from the stored value (separated by a ":")
+ // Split the iterations from the stored value (separated by a ':')
// Base64-decode the remaining value and take the last 8 bytes as the salt.
- int iterations;
- byte[] saltBytes;
- byte[] digestBytes = new byte[SHA1_LENGTH];
- int saltLength = 0;
try
{
String stored = storedPassword.toString();
- int stored_length = stored.length();
- int pos = 0;
- while (pos < stored_length && stored.charAt(pos) != ':')
- {
- pos++;
- }
- if (pos >= (stored_length - 1) || pos == 0)
- throw new Exception();
+ int pos = stored.indexOf(':');
- iterations = Integer.parseInt(stored.substring(0, pos));
+ final int iterations = Integer.parseInt(stored.substring(0, pos));
byte[] decodedBytes = Base64.decode(stored.substring(pos + 1));
- saltLength = decodedBytes.length - SHA1_LENGTH;
+ final int saltLength = decodedBytes.length - SHA1_LENGTH;
if (saltLength <= 0)
{
Message message =
@@ -283,10 +199,12 @@
ErrorLogger.logError(message);
return false;
}
- saltBytes = new byte[saltLength];
+
+ final byte[] digestBytes = new byte[SHA1_LENGTH];
+ final byte[] saltBytes = new byte[saltLength];
System.arraycopy(decodedBytes, 0, digestBytes, 0, SHA1_LENGTH);
- System.arraycopy(decodedBytes, SHA1_LENGTH, saltBytes, 0,
- saltLength);
+ System.arraycopy(decodedBytes, SHA1_LENGTH, saltBytes, 0, saltLength);
+ return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
}
catch (Exception e)
{
@@ -300,18 +218,19 @@
ErrorLogger.logError(message);
return false;
}
+ }
-
+ private boolean encodeAndMatch(ByteSequence plaintextPassword,
+ final byte[] saltBytes, byte[] digestBytes, int iterations)
+ {
// Use the salt to generate a digest based on the provided plain-text value.
int plainBytesLength = plaintextPassword.length();
- byte[] plainPlusSalt = new byte[plainBytesLength + saltLength];
+ byte[] plainPlusSalt = new byte[plainBytesLength + saltBytes.length];
plaintextPassword.copyTo(plainPlusSalt);
- System.arraycopy(saltBytes, 0, plainPlusSalt, plainBytesLength,
- saltLength);
+ System.arraycopy(saltBytes, 0, plainPlusSalt, plainBytesLength, saltBytes.length);
- byte[] userDigestBytes;
+
char[] plaintextChars = null;
-
synchronized (factoryLock)
{
try
@@ -320,7 +239,8 @@
KeySpec spec = new PBEKeySpec(
plaintextChars, saltBytes,
iterations, SHA1_LENGTH * 8);
- userDigestBytes = factory.generateSecret(spec).getEncoded();
+ final byte[] userDigestBytes = factory.generateSecret(spec).getEncoded();
+ return Arrays.equals(digestBytes, userDigestBytes);
}
catch (Exception e)
{
@@ -328,57 +248,52 @@
{
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
-
return false;
}
finally
{
if (plaintextChars != null)
+ {
Arrays.fill(plaintextChars, '0');
+ }
}
}
-
- return Arrays.equals(digestBytes, userDigestBytes);
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public boolean supportsAuthPasswordSyntax()
{
- // This storage scheme does support the authentication password syntax.
return true;
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public String getAuthPasswordSchemeName()
{
return AUTH_PASSWORD_SCHEME_NAME_PBKDF2;
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public ByteString encodeAuthPassword(ByteSequence plaintext)
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
- byte[] digestBytes;
- char[] plaintextChars = null;
int iterations = config.getPBKDF2Iterations();
+ byte[] digestBytes = getDigestBytes(plaintext, saltBytes, iterations);
- synchronized(factoryLock)
+ // Encode and return the value.
+ return ByteString.valueOf(AUTH_PASSWORD_SCHEME_NAME_PBKDF2 + '$'
+ + iterations + ':' + Base64.encode(saltBytes) + '$'
+ + Base64.encode(digestBytes));
+ }
+
+ private byte[] getDigestBytes(ByteSequence plaintext, byte[] saltBytes,
+ int iterations) throws DirectoryException
+ {
+ char[] plaintextChars = null;
+ synchronized (factoryLock)
{
try
{
@@ -388,7 +303,7 @@
KeySpec spec = new PBEKeySpec(
plaintextChars, saltBytes,
iterations, SHA1_LENGTH * 8);
- digestBytes = factory.generateSecret(spec).getEncoded();
+ return factory.generateSecret(spec).getEncoded();
}
catch (Exception e)
{
@@ -405,48 +320,25 @@
finally
{
if (plaintextChars != null)
+ {
Arrays.fill(plaintextChars, '0');
+ }
}
}
- // Encode and return the value.
- StringBuilder authPWValue = new StringBuilder();
- authPWValue.append(AUTH_PASSWORD_SCHEME_NAME_PBKDF2);
- authPWValue.append('$');
- authPWValue.append(Integer.toString(iterations));
- authPWValue.append(':');
- authPWValue.append(Base64.encode(saltBytes));
- authPWValue.append('$');
- authPWValue.append(Base64.encode(digestBytes));
-
- return ByteString.valueOf(authPWValue.toString());
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public boolean authPasswordMatches(ByteSequence plaintextPassword,
String authInfo, String authValue)
{
- byte[] saltBytes;
- byte[] digestBytes;
- int iterations;
-
try
{
- int pos = 0;
- int length = authInfo.length();
- while (pos < length && authInfo.charAt(pos) != ':')
- {
- pos++;
- }
- if (pos >= (length - 1) || pos == 0)
- throw new Exception();
- iterations = Integer.parseInt(authInfo.substring(0, pos));
- saltBytes = Base64.decode(authInfo.substring(pos + 1));
- digestBytes = Base64.decode(authValue);
+ int pos = authInfo.indexOf(':');
+ int iterations = Integer.parseInt(authInfo.substring(0, pos));
+ byte[] saltBytes = Base64.decode(authInfo.substring(pos + 1));
+ byte[] digestBytes = Base64.decode(authValue);
+ return encodeAndMatch(plaintextPassword, saltBytes, digestBytes, iterations);
}
catch (Exception e)
{
@@ -454,66 +346,19 @@
{
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
-
return false;
}
-
-
- int plainBytesLength = plaintextPassword.length();
- byte[] plainPlusSalt = new byte[plainBytesLength + saltBytes.length];
- plaintextPassword.copyTo(plainPlusSalt);
- System.arraycopy(saltBytes, 0, plainPlusSalt, plainBytesLength,
- saltBytes.length);
-
- byte[] userDigestBytes;
- char[] plaintextChars = null;
-
- synchronized (factoryLock)
- {
- try
- {
- plaintextChars = plaintextPassword.toString().toCharArray();
- KeySpec spec = new PBEKeySpec(
- plaintextChars, saltBytes,
- iterations, SHA1_LENGTH * 8);
- userDigestBytes = factory.generateSecret(spec).getEncoded();
- }
- catch (Exception e)
- {
- if (debugEnabled())
- {
- TRACER.debugCaught(DebugLogLevel.ERROR, e);
- }
-
- return false;
- }
- finally
- {
- if (plaintextChars != null)
- Arrays.fill(plaintextChars, '0');
- }
- }
-
- return Arrays.equals(digestBytes, userDigestBytes);
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public boolean isReversible()
{
return false;
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public ByteString getPlaintextValue(ByteSequence storedPassword)
throws DirectoryException
{
@@ -522,12 +367,8 @@
throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message);
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public ByteString getAuthPasswordPlaintextValue(String authInfo,
String authValue)
throws DirectoryException
@@ -537,15 +378,10 @@
throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION, message);
}
-
-
- /**
- * {@inheritDoc}
- */
- @Override()
+ /** {@inheritDoc} */
+ @Override
public boolean isStorageSchemeSecure()
{
- // PBKDF2 should be considered secure.
return true;
}
@@ -568,19 +404,33 @@
throws DirectoryException
{
byte[] saltBytes = new byte[NUM_SALT_BYTES];
- byte[] digestBytes;
- char[] plaintextChars = null;
int iterations = 10000;
+ byte[] digestBytes = getDigestBytes(passwordBytes, saltBytes, iterations);
+ // Append the salt to the hashed value and base64-the whole thing.
+ byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
+
+ System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
+ System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
+ NUM_SALT_BYTES);
+
+ return '{' + STORAGE_SCHEME_NAME_PBKDF2 + '}' + iterations + ':' +
+ Base64.encode(hashPlusSalt);
+ }
+
+ private static byte[] getDigestBytes(byte[] plaintext, byte[] saltBytes,
+ int iterations) throws DirectoryException
+ {
+ char[] plaintextChars = null;
try
{
SecureRandom.getInstance(SECURE_PRNG_SHA1).nextBytes(saltBytes);
- plaintextChars = passwordBytes.toString().toCharArray();
+ plaintextChars = plaintext.toString().toCharArray();
KeySpec spec = new PBEKeySpec(
plaintextChars, saltBytes,
iterations, SHA1_LENGTH * 8);
- digestBytes = SecretKeyFactory
+ return SecretKeyFactory
.getInstance(MESSAGE_DIGEST_ALGORITHM_PBKDF2)
.generateSecret(spec).getEncoded();
}
@@ -599,18 +449,10 @@
finally
{
if (plaintextChars != null)
+ {
Arrays.fill(plaintextChars, '0');
+ }
}
-
- // Append the salt to the hashed value and base64-the whole thing.
- byte[] hashPlusSalt = new byte[digestBytes.length + NUM_SALT_BYTES];
-
- System.arraycopy(digestBytes, 0, hashPlusSalt, 0, digestBytes.length);
- System.arraycopy(saltBytes, 0, hashPlusSalt, digestBytes.length,
- NUM_SALT_BYTES);
-
- return "{" + STORAGE_SCHEME_NAME_PBKDF2 + "}" + iterations + ":" +
- Base64.encode(hashPlusSalt);
}
}
--
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