2 package net.sourceforge.guacamole.net.basic;
5 * Guacamole - Clientless Remote Desktop
6 * Copyright (C) 2010 Michael Jumper
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU Affero General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Affero General Public License for more details.
18 * You should have received a copy of the GNU Affero General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 import java.io.BufferedReader;
23 import net.sourceforge.guacamole.net.auth.AuthenticationProvider;
25 import java.io.FileReader;
26 import java.io.IOException;
27 import java.io.Reader;
28 import java.security.MessageDigest;
29 import java.security.NoSuchAlgorithmException;
30 import java.util.Collections;
31 import java.util.HashMap;
33 import net.sourceforge.guacamole.GuacamoleException;
34 import net.sourceforge.guacamole.net.auth.UsernamePassword;
35 import net.sourceforge.guacamole.properties.FileGuacamoleProperty;
36 import net.sourceforge.guacamole.properties.GuacamoleProperties;
37 import net.sourceforge.guacamole.protocol.GuacamoleConfiguration;
38 import org.slf4j.Logger;
39 import org.slf4j.LoggerFactory;
40 import org.xml.sax.Attributes;
41 import org.xml.sax.InputSource;
42 import org.xml.sax.SAXException;
43 import org.xml.sax.XMLReader;
44 import org.xml.sax.helpers.DefaultHandler;
45 import org.xml.sax.helpers.XMLReaderFactory;
48 * Authenticates users against a static list of username/password pairs.
49 * Each username/password may be associated with exactly one configuration.
50 * This list is stored in an XML file which is reread if modified.
52 * @author Michael Jumper
54 public class BasicFileAuthenticationProvider implements AuthenticationProvider<UsernamePassword> {
56 private Logger logger = LoggerFactory.getLogger(BasicFileAuthenticationProvider.class);
58 private long mappingTime;
59 private Map<String, AuthInfo> mapping;
62 * The filename of the XML file to read the user mapping from.
64 public static final FileGuacamoleProperty BASIC_USER_MAPPING = new FileGuacamoleProperty() {
67 public String getName() { return "basic-user-mapping"; }
71 private File getUserMappingFile() throws GuacamoleException {
73 // Get user mapping file
74 return GuacamoleProperties.getProperty(BASIC_USER_MAPPING);
78 public synchronized void init() throws GuacamoleException {
80 // Get user mapping file
81 File mapFile = getUserMappingFile();
83 throw new GuacamoleException("Missing \"basic-user-mapping\" parameter required for basic login.");
85 logger.info("Reading user mapping file: {}", mapFile);
91 BasicUserMappingContentHandler contentHandler = new BasicUserMappingContentHandler();
93 XMLReader parser = XMLReaderFactory.createXMLReader();
94 parser.setContentHandler(contentHandler);
96 // Read and parse file
97 Reader reader = new BufferedReader(new FileReader(mapFile));
98 parser.parse(new InputSource(reader));
101 // Init mapping and record mod time of file
102 mappingTime = mapFile.lastModified();
103 mapping = contentHandler.getUserMapping();
106 catch (IOException e) {
107 throw new GuacamoleException("Error reading basic user mapping file.", e);
109 catch (SAXException e) {
110 throw new GuacamoleException("Error parsing basic user mapping XML.", e);
116 public Map<String, GuacamoleConfiguration> getAuthorizedConfigurations(UsernamePassword credentials) throws GuacamoleException {
118 // Check mapping file mod time
119 File userMappingFile = getUserMappingFile();
120 if (userMappingFile.exists() && mappingTime < userMappingFile.lastModified()) {
122 // If modified recently, gain exclusive access and recheck
123 synchronized (this) {
124 if (userMappingFile.exists() && mappingTime < userMappingFile.lastModified()) {
125 logger.info("User mapping file {} has been modified.", userMappingFile);
126 init(); // If still not up to date, re-init
132 // If no mapping available, report as such
134 throw new GuacamoleException("User mapping could not be read.");
136 // Validate and return info for given user and pass
137 AuthInfo info = mapping.get(credentials.getUsername());
138 if (info != null && info.validate(credentials.getUsername(), credentials.getPassword())) {
139 Map<String, GuacamoleConfiguration> configs = new HashMap<String, GuacamoleConfiguration>();
140 configs.put("DEFAULT", info.getConfiguration());
149 public static class AuthInfo {
151 public static enum Encoding {
156 private String auth_username;
157 private String auth_password;
158 private Encoding auth_encoding;
160 private GuacamoleConfiguration config;
162 public AuthInfo(String auth_username, String auth_password, Encoding auth_encoding) {
163 this.auth_username = auth_username;
164 this.auth_password = auth_password;
165 this.auth_encoding = auth_encoding;
167 config = new GuacamoleConfiguration();
170 private static final char HEX_CHARS[] = {
171 '0', '1', '2', '3', '4', '5', '6', '7',
172 '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
175 public static String getHexString(byte[] bytes) {
180 StringBuilder hex = new StringBuilder(2 * bytes.length);
181 for (byte b : bytes) {
182 hex.append(HEX_CHARS[(b & 0xF0) >> 4])
183 .append(HEX_CHARS[(b & 0x0F) ]);
186 return hex.toString();
191 public boolean validate(String username, String password) {
193 // If username matches
194 if (username != null && password != null && username.equals(auth_username)) {
196 switch (auth_encoding) {
201 return password.equals(auth_password);
205 // Compare hashed password
207 MessageDigest digest = MessageDigest.getInstance("MD5");
208 String hashedPassword = getHexString(digest.digest(password.getBytes()));
209 return hashedPassword.equals(auth_password.toUpperCase());
211 catch (NoSuchAlgorithmException e) {
212 throw new UnsupportedOperationException("Unexpected lack of MD5 support.", e);
223 public GuacamoleConfiguration getConfiguration() {
230 private static class BasicUserMappingContentHandler extends DefaultHandler {
232 private Map<String, AuthInfo> authMapping = new HashMap<String, AuthInfo>();
234 public Map<String, AuthInfo> getUserMapping() {
235 return Collections.unmodifiableMap(authMapping);
247 private State state = State.ROOT;
248 private AuthInfo current = null;
249 private String currentParameter = null;
252 public void endElement(String uri, String localName, String qName) throws SAXException {
258 if (localName.equals("user-mapping")) {
267 if (localName.equals("authorize")) {
269 // Finalize mapping for this user
271 current.auth_username,
275 state = State.USER_MAPPING;
283 if (localName.equals("protocol")) {
284 state = State.AUTH_INFO;
292 if (localName.equals("param")) {
293 state = State.AUTH_INFO;
301 throw new SAXException("Tag not yet complete: " + localName);
306 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
310 // Document must be <user-mapping>
313 if (localName.equals("user-mapping")) {
314 state = State.USER_MAPPING;
320 // Only <authorize> tags allowed in main document
323 if (localName.equals("authorize")) {
325 AuthInfo.Encoding encoding;
326 String encodingString = attributes.getValue("encoding");
327 if (encodingString == null)
328 encoding = AuthInfo.Encoding.PLAIN_TEXT;
329 else if (encodingString.equals("plain"))
330 encoding = AuthInfo.Encoding.PLAIN_TEXT;
331 else if (encodingString.equals("md5"))
332 encoding = AuthInfo.Encoding.MD5;
334 throw new SAXException("Invalid encoding type");
337 current = new AuthInfo(
338 attributes.getValue("username"),
339 attributes.getValue("password"),
344 state = State.AUTH_INFO;
352 if (localName.equals("protocol")) {
354 state = State.PROTOCOL;
358 if (localName.equals("param")) {
360 currentParameter = attributes.getValue("name");
361 if (currentParameter == null)
362 throw new SAXException("Attribute \"name\" required for param tag.");
365 state = State.PARAMETER;
373 throw new SAXException("Unexpected tag: " + localName);
378 public void characters(char[] ch, int start, int length) throws SAXException {
380 String str = new String(ch, start, length);
384 current.getConfiguration()
389 current.getConfiguration()
390 .setParameter(currentParameter, str);
395 if (str.trim().length() != 0)
396 throw new SAXException("Unexpected character data.");