libjava/classpath/gnu/javax/crypto/sasl/crammd5/PasswordFile.java

   1 /* PasswordFile.java --
   2    Copyright (C) 2003, 2006 Free Software Foundation, Inc.
   3
   4 This file is a part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or (at
   9 your option) any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; if not, write to the Free Software
  18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  19 USA
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version.  */
  37
  38
  39 package gnu.javax.crypto.sasl.crammd5;
  40
  41 import gnu.javax.crypto.sasl.NoSuchUserException;
  42 import gnu.javax.crypto.sasl.UserAlreadyExistsException;
  43
  44 import java.io.BufferedReader;
  45 import java.io.File;
  46 import java.io.FileInputStream;
  47 import java.io.FileOutputStream;
  48 import java.io.InputStream;
  49 import java.io.InputStreamReader;
  50 import java.io.IOException;
  51 import java.io.PrintWriter;
  52 import java.util.HashMap;
  53 import java.util.Iterator;
  54 import java.util.NoSuchElementException;
  55 import java.util.StringTokenizer;
  56
  57 /**
  58  * The CRAM-MD5 password file representation.
  59  */
  60 public class PasswordFile
  61 {
  62
  63   // Constants and variables
  64   // -------------------------------------------------------------------------
  65
  66   private static String DEFAULT_FILE;
  67   static
  68     {
  69       DEFAULT_FILE = System.getProperty(CramMD5Registry.PASSWORD_FILE,
  70                                         CramMD5Registry.DEFAULT_PASSWORD_FILE);
  71     }
  72
  73   private HashMap entries;
  74
  75   private File passwdFile;
  76
  77   private long lastmod;
  78
  79   // Constructor(s)
  80   // -------------------------------------------------------------------------
  81
  82   public PasswordFile() throws IOException
  83   {
  84     this(DEFAULT_FILE);
  85   }
  86
  87   public PasswordFile(final File pwFile) throws IOException
  88   {
  89     this(pwFile.getAbsolutePath());
  90   }
  91
  92   public PasswordFile(final String fileName) throws IOException
  93   {
  94     passwdFile = new File(fileName);
  95     update();
  96   }
  97
  98   // Class methods
  99   // -------------------------------------------------------------------------
 100
 101   // Instance methods
 102   // -------------------------------------------------------------------------
 103
 104   public synchronized void add(final String user, final String passwd,
 105                                final String[] attributes) throws IOException
 106   {
 107     checkCurrent(); // check if the entry exists
 108     if (entries.containsKey(user))
 109       {
 110         throw new UserAlreadyExistsException(user);
 111       }
 112     if (attributes.length != 5)
 113       {
 114         throw new IllegalArgumentException("Wrong number of attributes");
 115       }
 116
 117     final String[] fields = new String[7]; // create the new entry
 118     fields[0] = user;
 119     fields[1] = passwd;
 120     System.arraycopy(attributes, 0, fields, 2, 5);
 121     entries.put(user, fields);
 122     savePasswd();
 123   }
 124
 125   public synchronized void changePasswd(final String user, final String passwd)
 126       throws IOException
 127   {
 128     checkCurrent();
 129     if (!entries.containsKey(user))
 130       { // check if the entry exists
 131         throw new NoSuchUserException(user);
 132       }
 133
 134     final String[] fields = (String[]) entries.get(user); // get the existing entry
 135     fields[1] = passwd; // modify the password field
 136     entries.remove(user); // delete the existing entry
 137     entries.put(user, fields); // add the new entry
 138
 139     savePasswd();
 140   }
 141
 142   public synchronized String[] lookup(final String user) throws IOException
 143   {
 144     checkCurrent();
 145     if (!entries.containsKey(user))
 146       {
 147         throw new NoSuchUserException(user);
 148       }
 149     return (String[]) entries.get(user);
 150   }
 151
 152   public synchronized boolean contains(final String s) throws IOException
 153   {
 154     checkCurrent();
 155
 156     return entries.containsKey(s);
 157   }
 158
 159   private synchronized void update() throws IOException
 160   {
 161     lastmod = passwdFile.lastModified();
 162     readPasswd(new FileInputStream(passwdFile));
 163   }
 164
 165   private void checkCurrent() throws IOException
 166   {
 167     if (passwdFile.lastModified() > lastmod)
 168       {
 169         update();
 170       }
 171   }
 172
 173   private synchronized void readPasswd(final InputStream in) throws IOException
 174   {
 175     final BufferedReader din = new BufferedReader(new InputStreamReader(in));
 176     String line;
 177     entries = new HashMap();
 178     while ((line = din.readLine()) != null)
 179       {
 180         final String[] fields = new String[7];
 181         final StringTokenizer st = new StringTokenizer(line, ":", true);
 182         try
 183           {
 184             fields[0] = st.nextToken(); // username
 185             st.nextToken();
 186
 187             fields[1] = st.nextToken(); // passwd
 188             if (fields[1].equals(":"))
 189               {
 190                 fields[1] = "";
 191               }
 192             else
 193               {
 194                 st.nextToken();
 195               }
 196
 197             fields[2] = st.nextToken(); // uid
 198             if (fields[2].equals(":"))
 199               {
 200                 fields[2] = "";
 201               }
 202             else
 203               {
 204                 st.nextToken();
 205               }
 206
 207             fields[3] = st.nextToken(); // gid
 208             if (fields[3].equals(":"))
 209               {
 210                 fields[3] = "";
 211               }
 212             else
 213               {
 214                 st.nextToken();
 215               }
 216
 217             fields[4] = st.nextToken(); // gecos
 218             if (fields[4].equals(":"))
 219               {
 220                 fields[4] = "";
 221               }
 222             else
 223               {
 224                 st.nextToken();
 225               }
 226
 227             fields[5] = st.nextToken(); // dir
 228             if (fields[5].equals(":"))
 229               {
 230                 fields[5] = "";
 231               }
 232             else
 233               {
 234                 st.nextToken();
 235               }
 236
 237             fields[6] = st.nextToken(); // shell
 238             if (fields[6].equals(":"))
 239               {
 240                 fields[6] = "";
 241               }
 242           }
 243         catch (NoSuchElementException x)
 244           {
 245             continue;
 246           }
 247
 248         entries.put(fields[0], fields);
 249       }
 250   }
 251
 252   private synchronized void savePasswd() throws IOException
 253   {
 254     if (passwdFile != null)
 255       {
 256         final FileOutputStream fos = new FileOutputStream(passwdFile);
 257         PrintWriter pw = null;
 258         try
 259           {
 260             pw = new PrintWriter(fos);
 261             String key;
 262             String[] fields;
 263             StringBuffer sb;
 264             int i;
 265             for (Iterator it = entries.keySet().iterator(); it.hasNext();)
 266               {
 267                 key = (String) it.next();
 268                 fields = (String[]) entries.get(key);
 269                 sb = new StringBuffer(fields[0]);
 270                 for (i = 1; i < fields.length; i++)
 271                   {
 272                     sb.append(":").append(fields[i]);
 273                   }
 274                 pw.println(sb.toString());
 275               }
 276           }
 277         finally
 278           {
 279             if (pw != null)
 280               {
 281                 try
 282                   {
 283                     pw.flush();
 284                   }
 285                 finally
 286                   {
 287                     pw.close();
 288                   }
 289               }
 290             try
 291               {
 292                 fos.close();
 293               }
 294             catch (IOException ignored)
 295               {
 296               }
 297             lastmod = passwdFile.lastModified();
 298           }
 299       }
 300   }
 301 }