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annotate src/org/eclipse/jetty/util/security/Password.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 8e9db0bbf4f9
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.security;
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20
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21 import java.io.IOException;
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22 import java.util.Arrays;
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23
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24 import org.slf4j.Logger;
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25 import org.slf4j.LoggerFactory;
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26
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27 /* ------------------------------------------------------------ */
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28 /**
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29 * Password utility class.
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30 *
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31 * This utility class gets a password or pass phrase either by:
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32 *
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33 * <PRE>
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34 * + Password is set as a system property.
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35 * + The password is prompted for and read from standard input
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36 * + A program is run to get the password.
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37 * </pre>
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38 *
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39 * Passwords that begin with OBF: are de obfuscated. Passwords can be obfuscated
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40 * by run org.eclipse.util.Password as a main class. Obfuscated password are
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41 * required if a system needs to recover the full password (eg. so that it may
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42 * be passed to another system). They are not secure, but prevent casual
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43 * observation.
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44 * <p>
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45 * Passwords that begin with CRYPT: are oneway encrypted with UnixCrypt. The
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46 * real password cannot be retrieved, but comparisons can be made to other
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47 * passwords. A Crypt can be generated by running org.eclipse.util.UnixCrypt as
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48 * a main class, passing password and then the username. Checksum passwords are
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49 * a secure(ish) way to store passwords that only need to be checked rather than
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50 * recovered. Note that it is not strong security - specially if simple
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51 * passwords are used.
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52 *
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53 *
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54 */
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55 public class Password extends Credential
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56 {
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57 private static final Logger LOG = LoggerFactory.getLogger(Password.class);
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58
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59 private static final long serialVersionUID = 5062906681431569445L;
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60
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61 public static final String __OBFUSCATE = "OBF:";
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62
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63 private String _pw;
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64
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65 /* ------------------------------------------------------------ */
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66 /**
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67 * Constructor.
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68 *
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69 * @param password The String password.
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70 */
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71 public Password(String password)
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72 {
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73 _pw = password;
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74
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75 // expand password
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76 while (_pw != null && _pw.startsWith(__OBFUSCATE))
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77 _pw = deobfuscate(_pw);
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78 }
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79
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80 /* ------------------------------------------------------------ */
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81 @Override
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82 public String toString()
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83 {
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84 return _pw;
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85 }
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86
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87 /* ------------------------------------------------------------ */
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88 public String toStarString()
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89 {
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90 return "*****************************************************".substring(0, _pw.length());
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91 }
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92
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93 /* ------------------------------------------------------------ */
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94 @Override
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95 public boolean check(Object credentials)
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96 {
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97 if (this == credentials) return true;
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98
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99 if (credentials instanceof Password) return credentials.equals(_pw);
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100
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101 if (credentials instanceof String) return credentials.equals(_pw);
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102
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103 if (credentials instanceof char[]) return Arrays.equals(_pw.toCharArray(), (char[]) credentials);
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104
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105 if (credentials instanceof Credential) return ((Credential) credentials).check(_pw);
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106
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107 return false;
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108 }
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109
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110 /* ------------------------------------------------------------ */
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111 @Override
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112 public boolean equals(Object o)
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113 {
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114 if (this == o)
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115 return true;
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116
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117 if (null == o)
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118 return false;
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119
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120 if (o instanceof Password)
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121 {
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122 Password p = (Password) o;
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123 //noinspection StringEquality
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124 return p._pw == _pw || (null != _pw && _pw.equals(p._pw));
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125 }
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126
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127 if (o instanceof String)
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128 return o.equals(_pw);
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129
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130 return false;
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131 }
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132
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133 /* ------------------------------------------------------------ */
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134 @Override
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135 public int hashCode()
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136 {
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137 return null == _pw ? super.hashCode() : _pw.hashCode();
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138 }
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139
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140 /* ------------------------------------------------------------ */
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141 public static String obfuscate(String s)
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142 {
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143 StringBuilder buf = new StringBuilder();
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144 byte[] b = s.getBytes();
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145
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146 buf.append(__OBFUSCATE);
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147 for (int i = 0; i < b.length; i++)
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148 {
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149 byte b1 = b[i];
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150 byte b2 = b[s.length() - (i + 1)];
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151 int i1 = 127 + b1 + b2;
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152 int i2 = 127 + b1 - b2;
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153 int i0 = i1 * 256 + i2;
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154 String x = Integer.toString(i0, 36);
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155
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156 switch (x.length())
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157 {
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158 case 1:
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159 buf.append('0');
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160 buf.append('0');
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161 buf.append('0');
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162 buf.append(x);
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163 break;
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164 case 2:
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165 buf.append('0');
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166 buf.append('0');
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167 buf.append(x);
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168 break;
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169 case 3:
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170 buf.append('0');
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171 buf.append(x);
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172 break;
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173 default:
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174 buf.append(x);
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175 break;
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176 }
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177 }
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178 return buf.toString();
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179
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180 }
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181
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182 /* ------------------------------------------------------------ */
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183 public static String deobfuscate(String s)
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184 {
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185 if (s.startsWith(__OBFUSCATE)) s = s.substring(4);
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186
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187 byte[] b = new byte[s.length() / 2];
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188 int l = 0;
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189 for (int i = 0; i < s.length(); i += 4)
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190 {
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191 String x = s.substring(i, i + 4);
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192 int i0 = Integer.parseInt(x, 36);
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193 int i1 = (i0 / 256);
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194 int i2 = (i0 % 256);
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195 b[l++] = (byte) ((i1 + i2 - 254) / 2);
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196 }
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197
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198 return new String(b, 0, l);
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199 }
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200
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201 /* ------------------------------------------------------------ */
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202 /**
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203 * Get a password. A password is obtained by trying
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204 * <UL>
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205 * <LI>Calling <Code>System.getProperty(realm,dft)</Code>
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206 * <LI>Prompting for a password
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207 * <LI>Using promptDft if nothing was entered.
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208 * </UL>
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209 *
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210 * @param realm The realm name for the password, used as a SystemProperty
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211 * name.
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212 * @param dft The default password.
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213 * @param promptDft The default to use if prompting for the password.
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214 * @return Password
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215 */
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216 public static Password getPassword(String realm, String dft, String promptDft)
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217 {
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218 String passwd = System.getProperty(realm, dft);
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219 if (passwd == null || passwd.length() == 0)
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220 {
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221 try
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222 {
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223 System.out.print(realm + ((promptDft != null && promptDft.length() > 0) ? " [dft]" : "") + " : ");
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224 System.out.flush();
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225 byte[] buf = new byte[512];
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226 int len = System.in.read(buf);
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227 if (len > 0) passwd = new String(buf, 0, len).trim();
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228 }
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229 catch (IOException e)
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230 {
820
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231 LOG.warn("EXCEPTION", e);
802
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232 }
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233 if (passwd == null || passwd.length() == 0) passwd = promptDft;
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234 }
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235 return new Password(passwd);
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236 }
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237
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238 /* ------------------------------------------------------------ */
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239 /**
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240 * @param arg
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241 */
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242 public static void main(String[] arg)
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243 {
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244 if (arg.length != 1 && arg.length != 2)
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245 {
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246 System.err.println("Usage - java org.eclipse.jetty.security.Password [<user>] <password>");
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247 System.err.println("If the password is ?, the user will be prompted for the password");
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248 System.exit(1);
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249 }
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250 String p = arg[arg.length == 1 ? 0 : 1];
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251 Password pw = new Password(p);
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252 System.err.println(pw.toString());
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253 System.err.println(obfuscate(pw.toString()));
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254 System.err.println(Credential.MD5.digest(p));
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255 if (arg.length == 2) System.err.println(Credential.Crypt.crypt(arg[0], pw.toString()));
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256 }
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257 }