// ========================================================================
// Copyright (c) 1998-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.util.security;
import java.io.IOException;
import java.util.Arrays;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/**
* Password utility class.
*
* This utility class gets a password or pass phrase either by:
*
* <PRE>
* + Password is set as a system property.
* + The password is prompted for and read from standard input
* + A program is run to get the password.
* </pre>
*
* Passwords that begin with OBF: are de obfuscated. Passwords can be obfuscated
* by run org.eclipse.util.Password as a main class. Obfuscated password are
* required if a system needs to recover the full password (eg. so that it may
* be passed to another system). They are not secure, but prevent casual
* observation.
* <p>
* Passwords that begin with CRYPT: are oneway encrypted with UnixCrypt. The
* real password cannot be retrieved, but comparisons can be made to other
* passwords. A Crypt can be generated by running org.eclipse.util.UnixCrypt as
* a main class, passing password and then the username. Checksum passwords are
* a secure(ish) way to store passwords that only need to be checked rather than
* recovered. Note that it is not strong security - specially if simple
* passwords are used.
*
*
*/
public class Password extends Credential
{
private static final Logger LOG = Log.getLogger(Password.class);
private static final long serialVersionUID = 5062906681431569445L;
public static final String __OBFUSCATE = "OBF:";
private String _pw;
/* ------------------------------------------------------------ */
/**
* Constructor.
*
* @param password The String password.
*/
public Password(String password)
{
_pw = password;
// expand password
while (_pw != null && _pw.startsWith(__OBFUSCATE))
_pw = deobfuscate(_pw);
}
/* ------------------------------------------------------------ */
@Override
public String toString()
{
return _pw;
}
/* ------------------------------------------------------------ */
public String toStarString()
{
return "*****************************************************".substring(0, _pw.length());
}
/* ------------------------------------------------------------ */
@Override
public boolean check(Object credentials)
{
if (this == credentials) return true;
if (credentials instanceof Password) return credentials.equals(_pw);
if (credentials instanceof String) return credentials.equals(_pw);
if (credentials instanceof char[]) return Arrays.equals(_pw.toCharArray(), (char[]) credentials);
if (credentials instanceof Credential) return ((Credential) credentials).check(_pw);
return false;
}
/* ------------------------------------------------------------ */
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
if (null == o)
return false;
if (o instanceof Password)
{
Password p = (Password) o;
//noinspection StringEquality
return p._pw == _pw || (null != _pw && _pw.equals(p._pw));
}
if (o instanceof String)
return o.equals(_pw);
return false;
}
/* ------------------------------------------------------------ */
@Override
public int hashCode()
{
return null == _pw ? super.hashCode() : _pw.hashCode();
}
/* ------------------------------------------------------------ */
public static String obfuscate(String s)
{
StringBuilder buf = new StringBuilder();
byte[] b = s.getBytes();
buf.append(__OBFUSCATE);
for (int i = 0; i < b.length; i++)
{
byte b1 = b[i];
byte b2 = b[s.length() - (i + 1)];
int i1 = 127 + b1 + b2;
int i2 = 127 + b1 - b2;
int i0 = i1 * 256 + i2;
String x = Integer.toString(i0, 36);
switch (x.length())
{
case 1:
buf.append('0');
buf.append('0');
buf.append('0');
buf.append(x);
break;
case 2:
buf.append('0');
buf.append('0');
buf.append(x);
break;
case 3:
buf.append('0');
buf.append(x);
break;
default:
buf.append(x);
break;
}
}
return buf.toString();
}
/* ------------------------------------------------------------ */
public static String deobfuscate(String s)
{
if (s.startsWith(__OBFUSCATE)) s = s.substring(4);
byte[] b = new byte[s.length() / 2];
int l = 0;
for (int i = 0; i < s.length(); i += 4)
{
String x = s.substring(i, i + 4);
int i0 = Integer.parseInt(x, 36);
int i1 = (i0 / 256);
int i2 = (i0 % 256);
b[l++] = (byte) ((i1 + i2 - 254) / 2);
}
return new String(b, 0, l);
}
/* ------------------------------------------------------------ */
/**
* Get a password. A password is obtained by trying
* <UL>
* <LI>Calling <Code>System.getProperty(realm,dft)</Code>
* <LI>Prompting for a password
* <LI>Using promptDft if nothing was entered.
* </UL>
*
* @param realm The realm name for the password, used as a SystemProperty
* name.
* @param dft The default password.
* @param promptDft The default to use if prompting for the password.
* @return Password
*/
public static Password getPassword(String realm, String dft, String promptDft)
{
String passwd = System.getProperty(realm, dft);
if (passwd == null || passwd.length() == 0)
{
try
{
System.out.print(realm + ((promptDft != null && promptDft.length() > 0) ? " [dft]" : "") + " : ");
System.out.flush();
byte[] buf = new byte[512];
int len = System.in.read(buf);
if (len > 0) passwd = new String(buf, 0, len).trim();
}
catch (IOException e)
{
LOG.warn(Log.EXCEPTION, e);
}
if (passwd == null || passwd.length() == 0) passwd = promptDft;
}
return new Password(passwd);
}
/* ------------------------------------------------------------ */
/**
* @param arg
*/
public static void main(String[] arg)
{
if (arg.length != 1 && arg.length != 2)
{
System.err.println("Usage - java org.eclipse.jetty.security.Password [<user>] <password>");
System.err.println("If the password is ?, the user will be prompted for the password");
System.exit(1);
}
String p = arg[arg.length == 1 ? 0 : 1];
Password pw = new Password(p);
System.err.println(pw.toString());
System.err.println(obfuscate(pw.toString()));
System.err.println(Credential.MD5.digest(p));
if (arg.length == 2) System.err.println(Credential.Crypt.crypt(arg[0], pw.toString()));
}
}