/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.security.ldap.ppolicy;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import netscape.ldap.ber.stream.BERChoice;
import netscape.ldap.ber.stream.BERElement;
import netscape.ldap.ber.stream.BEREnumerated;
import netscape.ldap.ber.stream.BERInteger;
import netscape.ldap.ber.stream.BERIntegral;
import netscape.ldap.ber.stream.BERSequence;
import netscape.ldap.ber.stream.BERTag;
import netscape.ldap.ber.stream.BERTagDecoder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.DataRetrievalFailureException;
/**
* Represents the response control received when a <tt>PasswordPolicyControl</tt> is used when binding to a
* directory. Currently tested with the OpenLDAP 2.3.19 implementation of the LDAP Password Policy Draft. It extends
* the request control with the control specific data. This is accomplished by the properties <tt>timeBeforeExpiration</tt>,
* <tt>graceLoginsRemaining</tt>.
* <p>
*
*
* @author Stefan Zoerner
* @author Luke Taylor
*
* @see org.springframework.security.ldap.ppolicy.PasswordPolicyControl
* @see <a href="http://www.ibm.com/developerworks/tivoli/library/t-ldap-controls/">Stefan Zoerner's IBM developerworks
* article on LDAP controls.</a>
*/
public class PasswordPolicyResponseControl extends PasswordPolicyControl {
//~ Static fields/initializers =====================================================================================
private static final Log logger = LogFactory.getLog(PasswordPolicyResponseControl.class);
//~ Instance fields ================================================================================================
private final byte[] encodedValue;
private PasswordPolicyErrorStatus errorStatus;
private int graceLoginsRemaining = Integer.MAX_VALUE;
private int timeBeforeExpiration = Integer.MAX_VALUE;
//~ Constructors ===================================================================================================
/**
* Decodes the Ber encoded control data. The ASN.1 value of the control data is:<pre>
* PasswordPolicyResponseValue ::= SEQUENCE { warning [0] CHOICE {
* timeBeforeExpiration [0] INTEGER (0 .. maxInt),
* graceAuthNsRemaining [1] INTEGER (0 .. maxInt) } OPTIONAL, error [1] ENUMERATED {
* passwordExpired (0), accountLocked (1),
* changeAfterReset (2), passwordModNotAllowed (3),
* mustSupplyOldPassword (4), insufficientPasswordQuality (5),
* passwordTooShort (6), passwordTooYoung (7),
* passwordInHistory (8) } OPTIONAL }</pre>
*
*/
public PasswordPolicyResponseControl(byte[] encodedValue) {
this.encodedValue = encodedValue;
//PPolicyDecoder decoder = new JLdapDecoder();
PPolicyDecoder decoder = new NetscapeDecoder();
try {
decoder.decode();
} catch (IOException e) {
throw new DataRetrievalFailureException("Failed to parse control value", e);
}
}
//~ Methods ========================================================================================================
/**
* Returns the unchanged value of the response control. Returns the unchanged value of the response
* control as byte array.
*/
public byte[] getEncodedValue() {
return encodedValue;
}
public PasswordPolicyErrorStatus getErrorStatus() {
return errorStatus;
}
/**
* Returns the graceLoginsRemaining.
*
* @return Returns the graceLoginsRemaining.
*/
public int getGraceLoginsRemaining() {
return graceLoginsRemaining;
}
/**
* Returns the timeBeforeExpiration.
*
* @return Returns the time before expiration in seconds
*/
public int getTimeBeforeExpiration() {
return timeBeforeExpiration;
}
/**
* Checks whether an error is present.
*
* @return true, if an error is present
*/
public boolean hasError() {
return errorStatus != null;
}
/**
* Checks whether a warning is present.
*
* @return true, if a warning is present
*/
public boolean hasWarning() {
return (graceLoginsRemaining != Integer.MAX_VALUE) || (timeBeforeExpiration != Integer.MAX_VALUE);
}
public boolean isExpired() {
return errorStatus == PasswordPolicyErrorStatus.PASSWORD_EXPIRED;
}
public boolean isChangeAfterReset() {
return errorStatus == PasswordPolicyErrorStatus.CHANGE_AFTER_RESET;
}
public boolean isUsingGraceLogins() {
return graceLoginsRemaining < Integer.MAX_VALUE;
}
/**
* Determines whether an account locked error has been returned.
*
* @return true if the account is locked.
*/
public boolean isLocked() {
return errorStatus == PasswordPolicyErrorStatus.ACCOUNT_LOCKED;
}
/**
* Create a textual representation containing error and warning messages, if any are present.
*
* @return error and warning messages
*/
public String toString() {
StringBuilder sb = new StringBuilder("PasswordPolicyResponseControl");
if (hasError()) {
sb.append(", error: ").append(errorStatus.getDefaultMessage());
}
if (graceLoginsRemaining != Integer.MAX_VALUE) {
sb.append(", warning: ").append(graceLoginsRemaining).append(" grace logins remain");
}
if (timeBeforeExpiration != Integer.MAX_VALUE) {
sb.append(", warning: time before expiration is ").append(timeBeforeExpiration);
}
if (!hasError() && !hasWarning()) {
sb.append(" (no error, no warning)");
}
return sb.toString();
}
//~ Inner Interfaces ===============================================================================================
private interface PPolicyDecoder {
void decode() throws IOException;
}
//~ Inner Classes ==================================================================================================
/**
* Decoder based on Netscape ldapsdk library
*/
private class NetscapeDecoder implements PPolicyDecoder {
public void decode() throws IOException {
int[] bread = {0};
BERSequence seq = (BERSequence) BERElement.getElement(new SpecificTagDecoder(),
new ByteArrayInputStream(encodedValue), bread);
int size = seq.size();
if (logger.isDebugEnabled()) {
logger.debug("PasswordPolicyResponse, ASN.1 sequence has " + size + " elements");
}
for (int i = 0; i < seq.size(); i++) {
BERTag elt = (BERTag) seq.elementAt(i);
int tag = elt.getTag() & 0x1F;
if (tag == 0) {
BERChoice warning = (BERChoice) elt.getValue();
BERTag content = (BERTag) warning.getValue();
int value = ((BERInteger) content.getValue()).getValue();
if ((content.getTag() & 0x1F) == 0) {
timeBeforeExpiration = value;
} else {
graceLoginsRemaining = value;
}
} else if (tag == 1) {
BERIntegral error = (BERIntegral) elt.getValue();
errorStatus = PasswordPolicyErrorStatus.values()[error.getValue()];
}
}
}
class SpecificTagDecoder extends BERTagDecoder {
/** Allows us to remember which of the two options we're decoding */
private Boolean inChoice = null;
public BERElement getElement(BERTagDecoder decoder, int tag, InputStream stream, int[] bytesRead,
boolean[] implicit) throws IOException {
tag &= 0x1F;
implicit[0] = false;
if (tag == 0) {
// Either the choice or the time before expiry within it
if (inChoice == null) {
setInChoice(true);
// Read the choice length from the stream (ignored)
BERElement.readLengthOctets(stream, bytesRead);
int[] componentLength = new int[1];
BERElement choice = new BERChoice(decoder, stream, componentLength);
bytesRead[0] += componentLength[0];
// inChoice = null;
return choice;
} else {
// Must be time before expiry
return new BERInteger(stream, bytesRead);
}
} else if (tag == 1) {
// Either the graceLogins or the error enumeration.
if (inChoice == null) {
// The enumeration
setInChoice(false);
return new BEREnumerated(stream, bytesRead);
} else {
if (inChoice.booleanValue()) {
// graceLogins
return new BERInteger(stream, bytesRead);
}
}
}
throw new DataRetrievalFailureException("Unexpected tag " + tag);
}
private void setInChoice(boolean inChoice) {
this.inChoice = Boolean.valueOf(inChoice);
}
}
}
/** Decoder based on the OpenLDAP/Novell JLDAP library */
// private class JLdapDecoder implements PPolicyDecoder {
//
// public void decode() throws IOException {
//
// LBERDecoder decoder = new LBERDecoder();
//
// ASN1Sequence seq = (ASN1Sequence)decoder.decode(encodedValue);
//
// if(seq == null) {
//
// }
//
// int size = seq.size();
//
// if(logger.isDebugEnabled()) {
// logger.debug("PasswordPolicyResponse, ASN.1 sequence has " +
// size + " elements");
// }
//
// for(int i=0; i < size; i++) {
//
// ASN1Tagged taggedObject = (ASN1Tagged)seq.get(i);
//
// int tag = taggedObject.getIdentifier().getTag();
//
// ASN1OctetString value = (ASN1OctetString)taggedObject.taggedValue();
// byte[] content = value.byteValue();
//
// if(tag == 0) {
// parseWarning(content, decoder);
//
// } else if(tag == 1) {
// // Error: set the code to the value
// errorCode = content[0];
// }
// }
// }
//
// private void parseWarning(byte[] content, LBERDecoder decoder) {
// // It's the warning (choice). Parse the number and set either the
// // expiry time or number of logins remaining.
// ASN1Tagged taggedObject = (ASN1Tagged)decoder.decode(content);
// int contentTag = taggedObject.getIdentifier().getTag();
// content = ((ASN1OctetString)taggedObject.taggedValue()).byteValue();
// int number;
//
// try {
// number = ((Long)decoder.decodeNumeric(new ByteArrayInputStream(content), content.length)).intValue();
// } catch(IOException e) {
// throw new LdapDataAccessException("Failed to parse number ", e);
// }
//
// if(contentTag == 0) {
// timeBeforeExpiration = number;
// } else if (contentTag == 1) {
// graceLoginsRemaining = number;
// }
// }
// }
}