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/*
* Copyright 2019 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2019 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk;
import java.io.Serializable;
import com.unboundid.asn1.ASN1OctetString;
import com.unboundid.util.Base64;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.ldap.sdk.LDAPMessages.*;
/**
* This class holds the elements associated with the server first message in a
* SCRAM authentication sequence.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
final class SCRAMServerFirstMessage
implements Serializable
{
/**
* The minimum allowed iteration count value.
*/
private static final int MINIMUM_ALLOWED_ITERATION_COUNT = 4096;
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = 3888813341685523286L;
// The bind result containing the server first message.
private final BindResult bindResult;
// The salt to use with the password.
private final byte[] salt;
// The iteration count.
private final int iterationCount;
// The bind request being processed.
private final SCRAMBindRequest bindRequest;
// The client first message that was sent to the server.
private final SCRAMClientFirstMessage clientFirstMessage;
// The string representation of the server first message included in the bind
// result.
private final String serverFirstMessage;
// A string containing the client nonce concatenated with the server nonce.
private final String combinedNonce;
// The portion of the nonce that was generated by the server.
private final String serverNonce;
/**
* Creates a new server first message with the provided information.
*
* @param bindRequest The SCRAM bind request being processed. It
* must not be {@code null}.
* @param clientFirstMessage The client first message that was sent to the
* server. It must not be {@code null}.
* @param bindResult The bind result from which to extract the
* server first message. It must not be
* {@code null}.
*
* @throws LDAPBindException If a problem is encountered while parsing the
* server first message from the provided bind
* result.
*/
SCRAMServerFirstMessage(final SCRAMBindRequest bindRequest,
final SCRAMClientFirstMessage clientFirstMessage,
final BindResult bindResult)
throws LDAPBindException
{
this.bindRequest = bindRequest;
this.clientFirstMessage = clientFirstMessage;
this.bindResult = bindResult;
// Make sure that the bind result included server SASL credentials.
final ASN1OctetString serverSASLCredentials =
bindResult.getServerSASLCredentials();
if (serverSASLCredentials == null)
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NO_CREDS.get(
bindRequest.getSASLMechanismName()),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
// The first component of the message must be the combined nonce, which will
// be preceded by "r=".
serverFirstMessage = serverSASLCredentials.stringValue();
if (!serverFirstMessage.startsWith("r="))
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NO_NONCE.get(
bindRequest.getSASLMechanismName(), serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
// The combined nonce will be followed by a base64-encoded salt, which will
// be preceded by a comma and "s=".
final int commaSEqualsPos = serverFirstMessage.indexOf(",s=");
if (commaSEqualsPos < 0)
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NO_SALT.get(
bindRequest.getSASLMechanismName(), serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
// The salt will be followed by the iteration count, which will be preceded
// by a comma and "i=".
final int commaIEqualsPos =
serverFirstMessage.indexOf(",i=", commaSEqualsPos);
if (commaIEqualsPos < 0)
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NO_ITERATION_COUNT.get(
bindRequest.getSASLMechanismName(), serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
// Extract the combined nonce. Make sure that it starts with the expected
// client nonce, and that a server nonce was appended to it.
combinedNonce = serverFirstMessage.substring(2, commaSEqualsPos);
if (!combinedNonce.startsWith(clientFirstMessage.getClientNonce()))
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NONCE_MISSING_CLIENT.get(
bindRequest.getSASLMechanismName(), serverFirstMessage,
combinedNonce, clientFirstMessage.getClientNonce(),
clientFirstMessage.getClientFirstMessage()),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
if (combinedNonce.equals(clientFirstMessage.getClientNonce()))
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_NONCE_MISSING_SERVER.get(
bindRequest.getSASLMechanismName(), serverFirstMessage,
combinedNonce, clientFirstMessage.getClientFirstMessage()),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
serverNonce = combinedNonce.substring(
clientFirstMessage.getClientNonce().length());
// Extract the salt. Make sure it can be base64 decoded.
final String saltString = serverFirstMessage.substring(
(commaSEqualsPos + 3), commaIEqualsPos);
if (saltString.isEmpty())
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_SALT_EMPTY.get(
bindRequest.getSASLMechanismName(), serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
try
{
salt = Base64.decode(saltString);
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_SALT_NOT_BASE64.get(
bindRequest.getSASLMechanismName(), saltString,
serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
// Extract the iteration count. Make sure that it is an integer value that
// is greater than or equal to the minimum allowed value. Note that it's
// possible that there may be extensions after the iteration count, and if
// there are then we will ignore them.
final String iterationCountString;
final int extensionCommaPos =
serverFirstMessage.indexOf(',', (commaIEqualsPos + 1));
if (extensionCommaPos > 0)
{
iterationCountString = serverFirstMessage.substring(
(commaIEqualsPos + 3), extensionCommaPos);
}
else
{
iterationCountString = serverFirstMessage.substring(commaIEqualsPos + 3);
}
try
{
iterationCount = Integer.parseInt(iterationCountString);
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_ITERATION_COUNT_NOT_INTEGER.get(
bindRequest.getSASLMechanismName(), iterationCountString,
serverFirstMessage),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
if (iterationCount < MINIMUM_ALLOWED_ITERATION_COUNT)
{
throw new LDAPBindException(new BindResult(bindResult.getMessageID(),
ResultCode.DECODING_ERROR,
ERR_SCRAM_SERVER_FIRST_MESSAGE_ITERATION_COUNT_BELOW_MINIMUM.get(
bindRequest.getSASLMechanismName(), iterationCount,
serverFirstMessage, MINIMUM_ALLOWED_ITERATION_COUNT),
bindResult.getMatchedDN(), bindResult.getReferralURLs(),
bindResult.getResponseControls(), serverSASLCredentials));
}
}
/**
* Retrieves the SCRAM bind request being processed.
*
* @return The SCRAM bind request being processed.
*/
SCRAMBindRequest getBindRequest()
{
return bindRequest;
}
/**
* Retrieves the client first message with which this server first message
* is associated.
*
* @return The client first message with which this server first message is
* associated.
*/
SCRAMClientFirstMessage getClientFirstMessage()
{
return clientFirstMessage;
}
/**
* Retrieves the bind result that contained this server first message.
*
* @return The bind result that contained this server first message.
*/
BindResult getBindResult()
{
return bindResult;
}
/**
* Retrieves the combined nonce for this server first message.
*
* @return The combined nonce for this server first message.
*/
String getCombinedNonce()
{
return combinedNonce;
}
/**
* Retrieves the portion of the nonce that was generated by the server.
*
* @return The portion of the nonce that was generated by the server.
*/
String getServerNonce()
{
return serverNonce;
}
/**
* Retrieves the salt for this server first message.
*
* @return The salt for this server first message.
*/
byte[] getSalt()
{
return salt;
}
/**
* Retrieves the iteration count for this server first message.
*
* @return The iteration count for this server first message.
*/
int getIterationCount()
{
return iterationCount;
}
/**
* Retrieves a string representation of the server first message.
*
* @return A string representation of the server first message.
*/
String getServerFirstMessage()
{
return serverFirstMessage;
}
/**
* Retrieves a string representation of this SCRAM server first message.
*
* @return A string representation of this SCRAM server first message.
*/
@Override()
public String toString()
{
return serverFirstMessage;
}
}
