package gnu.crypto.sasl.crammd5;
// ----------------------------------------------------------------------------
// $Id: PasswordFile.java,v 1.3 2005/10/06 04:24:18 rsdio Exp $
//
// Copyright (C) 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto 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; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.sasl.NoSuchUserException;
import gnu.crypto.sasl.UserAlreadyExistsException;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
/**
* The CRAM-MD5 password file representation.
*
* @version $Revision: 1.3 $
*/
public class PasswordFile {
// Constants and variables
// -------------------------------------------------------------------------
private static String DEFAULT_FILE;
static {
DEFAULT_FILE = System.getProperty(
CramMD5Registry.PASSWORD_FILE,
CramMD5Registry.DEFAULT_PASSWORD_FILE);
}
private HashMap entries;
private File passwdFile;
private long lastmod;
// Constructor(s)
// -------------------------------------------------------------------------
public PasswordFile() throws IOException {
this(DEFAULT_FILE);
}
public PasswordFile(final File pwFile) throws IOException {
this(pwFile.getAbsolutePath());
}
public PasswordFile(final String fileName) throws IOException {
passwdFile = new File(fileName);
update();
}
// Class methods
// -------------------------------------------------------------------------
// Instance methods
// -------------------------------------------------------------------------
public synchronized void
add(final String user, final String passwd, final String[] attributes)
throws IOException {
checkCurrent(); // check if the entry exists
if (entries.containsKey(user)) {
throw new UserAlreadyExistsException(user);
}
if (attributes.length != 5) {
throw new IllegalArgumentException("Wrong number of attributes");
}
final String[] fields = new String[7]; // create the new entry
fields[0] = user;
fields[1] = passwd;
System.arraycopy(attributes, 0, fields, 2, 5);
entries.put(user, fields);
savePasswd();
}
public synchronized void changePasswd(final String user, final String passwd)
throws IOException {
checkCurrent();
if (!entries.containsKey(user)) { // check if the entry exists
throw new NoSuchUserException(user);
}
final String[] fields = (String[]) entries.get(user); // get the existing entry
fields[1] = passwd; // modify the password field
entries.remove(user); // delete the existing entry
entries.put(user, fields); // add the new entry
savePasswd();
}
public synchronized String[] lookup(final String user) throws IOException {
checkCurrent();
if (!entries.containsKey(user)) {
throw new NoSuchUserException(user);
}
return (String[]) entries.get(user);
}
public synchronized boolean contains(final String s) throws IOException {
checkCurrent();
return entries.containsKey(s);
}
private synchronized void update() throws IOException {
lastmod = passwdFile.lastModified();
readPasswd(new FileInputStream(passwdFile));
}
private void checkCurrent() throws IOException {
if (passwdFile.lastModified() > lastmod) {
update();
}
}
private synchronized void readPasswd(final InputStream in) throws IOException {
final BufferedReader din = new BufferedReader(new InputStreamReader(in));
String line;
entries = new HashMap();
while ((line = din.readLine()) != null) {
final String[] fields = new String[7];
final StringTokenizer st = new StringTokenizer(line, ":", true);
try {
fields[0] = st.nextToken(); // username
st.nextToken();
fields[1] = st.nextToken(); // passwd
if (fields[1].equals(":")) {
fields[1] = "";
} else {
st.nextToken();
}
fields[2] = st.nextToken(); // uid
if (fields[2].equals(":")) {
fields[2] = "";
} else {
st.nextToken();
}
fields[3] = st.nextToken(); // gid
if (fields[3].equals(":")) {
fields[3] = "";
} else {
st.nextToken();
}
fields[4] = st.nextToken(); // gecos
if (fields[4].equals(":")) {
fields[4] = "";
} else {
st.nextToken();
}
fields[5] = st.nextToken(); // dir
if (fields[5].equals(":")) {
fields[5] = "";
} else {
st.nextToken();
}
fields[6] = st.nextToken(); // shell
if (fields[6].equals(":")) {
fields[6] = "";
}
} catch (NoSuchElementException x) {
continue;
}
entries.put(fields[0], fields);
}
}
private synchronized void savePasswd() throws IOException {
if (passwdFile != null) {
final FileOutputStream fos = new FileOutputStream(passwdFile);
PrintWriter pw = null;
try {
pw = new PrintWriter(fos);
String key;
String[] fields;
StringBuffer sb;
int i;
for (Iterator it = entries.keySet().iterator(); it.hasNext(); ) {
key = (String) it.next();
fields = (String[]) entries.get(key);
sb = new StringBuffer(fields[0]);
for (i = 1; i < fields.length; i++) {
sb.append(":").append(fields[i]);
}
pw.println(sb.toString());
}
} finally {
if (pw != null) {
try {
pw.flush();
} finally {
pw.close();
}
}
try {
fos.close();
} catch (IOException ignored) {
}
lastmod = passwdFile.lastModified();
}
}
}
}