001 /* Sasl.java --
002 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.security.sasl;
040
041 import java.security.Provider;
042 import java.security.Security;
043 import java.util.Enumeration;
044 import java.util.HashSet;
045 import java.util.Iterator;
046 import java.util.Map;
047 import java.util.Vector;
048
049 import javax.security.auth.callback.CallbackHandler;
050
051 /**
052 * <p>A static class for creating SASL clients and servers.</p>
053 *
054 * <p>This class defines the policy of how to locate, load, and instantiate SASL
055 * clients and servers.</p>
056 *
057 * <p>For example, an application or library gets a SASL client instance by
058 * doing something like:</p>
059 *
060 * <pre>
061 *SaslClient sc =
062 * Sasl.createSaslClient(mechanisms, authorizationID, protocol,
063 * serverName, props, callbackHandler);
064 * </pre>
065 *
066 * <p>It can then proceed to use the instance to create an authenticated
067 * connection.</p>
068 *
069 * <p>Similarly, a server gets a SASL server instance by using code that looks
070 * as follows:</p>
071 *
072 * <pre>
073 *SaslServer ss =
074 * Sasl.createSaslServer(mechanism, protocol, serverName, props,
075 * callbackHandler);
076 * </pre>
077 *
078 * @since 1.5
079 */
080 public class Sasl
081 {
082
083 // Constants and variables
084 // -------------------------------------------------------------------------
085
086 /**
087 * <p>The name of a property that specifies the quality-of-protection to use.
088 * The property contains a comma-separated, ordered list of quality-of-
089 * protection values that the client or server is willing to support. A qop
090 * value is one of:</p>
091 *
092 * <ul>
093 * <li><code>"auth"</code> - authentication only,</li>
094 * <li><code>"auth-int"</code> - authentication plus integrity
095 * protection,</li>
096 * <li><code>"auth-conf"</code> - authentication plus integrity and
097 * confidentiality protection.</li>
098 * </ul>
099 *
100 * <p>The order of the list specifies the preference order of the client or
101 * server.</p>
102 *
103 * <p>If this property is absent, the default qop is <code>"auth"</code>.</p>
104 *
105 * <p>The value of this constant is <code>"javax.security.sasl.qop"</code>.</p>
106 */
107 public static final String QOP = "javax.security.sasl.qop";
108
109 /**
110 * <p>The name of a property that specifies the cipher strength to use. The
111 * property contains a comma-separated, ordered list of cipher strength
112 * values that the client or server is willing to support. A strength value
113 * is one of:</p>
114 *
115 * <ul>
116 * <li><code>"low"</code>,</li>
117 * <li><code>"medium"</code>,</li>
118 * <li><code>"high"</code>.</li>
119 * </ul>
120 *
121 * <p>The order of the list specifies the preference order of the client or
122 * server. An implementation should allow configuration of the meaning of
123 * these values. An application may use the Java Cryptography Extension (JCE)
124 * with JCE-aware mechanisms to control the selection of cipher suites that
125 * match the strength values.</p>
126 *
127 * <p>If this property is absent, the default strength is
128 * <code>"high,medium,low"</code>.</p>
129 *
130 * <p>The value of this constant is <code>"javax.security.sasl.strength"</code>.
131 * </p>
132 */
133 public static final String STRENGTH = "javax.security.sasl.strength";
134
135 /**
136 * <p>The name of a property that specifies whether the server must authenticate
137 * to the client. The property contains <code>"true"</code> if the server
138 * must authenticate the to client; <code>"false"</code> otherwise. The
139 * default is <code>"false"</code>.</p>
140 *
141 * <p>The value of this constant is
142 * <code>"javax.security.sasl.server.authentication"</code>.</p>
143 */
144 public static final String SERVER_AUTH = "javax.security.sasl.server.authentication";
145
146 /**
147 * <p>The name of a property that specifies the maximum size of the receive
148 * buffer in bytes of {@link SaslClient}/{@link SaslServer}. The property
149 * contains the string representation of an integer.</p>
150 *
151 * <p>If this property is absent, the default size is defined by the
152 * mechanism.</p>
153 *
154 * <p>The value of this constant is <code>"javax.security.sasl.maxbuffer"</code>.
155 * </p>
156 */
157 public static final String MAX_BUFFER = "javax.security.sasl.maxbuffer";
158
159 /**
160 * <p>The name of a property that specifies the maximum size of the raw send
161 * buffer in bytes of {@link SaslClient}/{@link SaslServer}. The property
162 * contains the string representation of an integer. The value of this
163 * property is negotiated between the client and server during the
164 * authentication exchange.</p>
165 *
166 * <p>The value of this constant is <code>"javax.security.sasl.rawsendsize"</code>.
167 * </p>
168 */
169 public static final String RAW_SEND_SIZE = "javax.security.sasl.rawsendsize";
170
171 /**
172 * <p>The name of a property that specifies whether mechanisms susceptible
173 * to simple plain passive attacks (e.g., "PLAIN") are not permitted. The
174 * property contains <code>"true"</code> if such mechanisms are not
175 * permitted; <code>"false"</code> if such mechanisms are permitted. The
176 * default is <code>"false"</code>.</p>
177 *
178 * <p>The value of this constant is <code>"javax.security.sasl.policy.noplaintext"</code>.
179 * </p>
180 */
181 public static final String POLICY_NOPLAINTEXT = "javax.security.sasl.policy.noplaintext";
182
183 /**
184 * <p>The name of a property that specifies whether mechanisms susceptible to
185 * active (non-dictionary) attacks are not permitted. The property contains
186 * <code>"true"</code> if mechanisms susceptible to active attacks are not
187 * permitted; <code>"false"</code> if such mechanisms are permitted. The
188 * default is <code>"false"</code>.</p>
189 *
190 * <p>The value of this constant is <code>"javax.security.sasl.policy.noactive"</code>.
191 * </p>
192 */
193 public static final String POLICY_NOACTIVE = "javax.security.sasl.policy.noactive";
194
195 /**
196 * <p>The name of a property that specifies whether mechanisms susceptible to
197 * passive dictionary attacks are not permitted. The property contains
198 * <code>"true"</code> if mechanisms susceptible to dictionary attacks are
199 * not permitted; <code>"false"</code> if such mechanisms are permitted. The
200 * default is <code>"false"</code>.</p>
201 *
202 * <p>The value of this constant is <code>"javax.security.sasl.policy.nodictionary"</code>.
203 * </p>
204 */
205 public static final String POLICY_NODICTIONARY = "javax.security.sasl.policy.nodictionary";
206
207 /**
208 * <p>The name of a property that specifies whether mechanisms that accept
209 * anonymous login are not permitted. The property contains <code>"true"</code>
210 * if mechanisms that accept anonymous login are not permitted; <code>"false"
211 * </code> if such mechanisms are permitted. The default is <code>"false"</code>.
212 * </p>
213 *
214 * <p>The value of this constant is <code>"javax.security.sasl.policy.noanonymous"</code>.
215 * </p>
216 */
217 public static final String POLICY_NOANONYMOUS = "javax.security.sasl.policy.noanonymous";
218
219 /**
220 * The name of a property that specifies whether mechanisms that implement
221 * forward secrecy between sessions are required. Forward secrecy means that
222 * breaking into one session will not automatically provide information for
223 * breaking into future sessions. The property contains <code>"true"</code>
224 * if mechanisms that implement forward secrecy between sessions are
225 * required; <code>"false"</code> if such mechanisms are not required. The
226 * default is <code>"false"</code>.
227 *
228 * <p>The value of this constant is <code>"javax.security.sasl.policy.forward"</code>.
229 * </p>
230 */
231 public static final String POLICY_FORWARD_SECRECY = "javax.security.sasl.policy.forward";
232
233 /**
234 * The name of a property that specifies whether mechanisms that pass client
235 * credentials are required. The property contains <code>"true"</code> if
236 * mechanisms that pass client credentials are required; <code>"false"</code>
237 * if such mechanisms are not required. The default is <code>"false"</code>.
238 *
239 * <p>The value of this constant is <code>"javax.security.sasl.policy.credentials"</code>.
240 * </p>
241 */
242 public static final String POLICY_PASS_CREDENTIALS = "javax.security.sasl.policy.credentials";
243
244 /**
245 * <p>The name of a property that specifies whether to reuse previously
246 * authenticated session information. The property contains <code>"true"</code>
247 * if the mechanism implementation may attempt to reuse previously
248 * authenticated session information; it contains <code>"false"</code> if the
249 * implementation must not reuse previously authenticated session information.
250 * A setting of <code>"true"</code> serves only as a hint; it does not
251 * necessarily entail actual reuse because reuse might not be possible due to
252 * a number of reasons, including, but not limited to, lack of mechanism
253 * support for reuse, expiration of reusable information, and the peer's
254 * refusal to support reuse. The property's default value is <code>"false"</code>.
255 * </p>
256 *
257 * <p>The value of this constant is <code>"javax.security.sasl.reuse"</code>.
258 * Note that all other parameters and properties required to create a SASL
259 * client/server instance must be provided regardless of whether this
260 * property has been supplied. That is, you cannot supply any less
261 * information in anticipation of reuse. Mechanism implementations that
262 * support reuse might allow customization of its implementation for factors
263 * such as cache size, timeouts, and criteria for reuseability. Such
264 * customizations are implementation-dependent.</p>
265 */
266 public static final String REUSE = "javax.security.sasl.reuse";
267
268 private static final String CLIENT_FACTORY_SVC = "SaslClientFactory.";
269 private static final String SERVER_FACTORY_SVC = "SaslServerFactory.";
270 private static final String ALIAS = "Alg.Alias.";
271
272 // Constructor(s)
273 // -------------------------------------------------------------------------
274
275 private Sasl()
276 {
277 super();
278 }
279
280 // Class methods
281 // -------------------------------------------------------------------------
282
283 /**
284 * Creates a {@link SaslClient} for the specified mechanism.
285 *
286 * <p>This method uses the JCA Security Provider Framework, described in the
287 * "Java Cryptography Architecture API Specification & Reference", for
288 * locating and selecting a {@link SaslClient} implementation.</p>
289 *
290 * <p>First, it obtains an ordered list of {@link SaslClientFactory}
291 * instances from the registered security providers for the
292 * <code>"SaslClientFactory"</code> service and the specified mechanism. It
293 * then invokes <code>createSaslClient()</code> on each factory instance on
294 * the list until one produces a non-null {@link SaslClient} instance. It
295 * returns the non-null {@link SaslClient} instance, or <code>null</code> if
296 * the search fails to produce a non-null {@link SaslClient} instance.</p>
297 *
298 * <p>A security provider for <code>SaslClientFactory</code> registers with
299 * the JCA Security Provider Framework keys of the form:</p>
300 *
301 * <pre>
302 * SaslClientFactory.mechanism_name
303 * </pre>
304 *
305 * <p>and values that are class names of implementations of {@link
306 * SaslClientFactory}.</p>
307 *
308 * <p>For example, a provider that contains a factory class,
309 * <code>com.wiz.sasl.digest.ClientFactory</code>, that supports the
310 * <code>"DIGEST-MD5"</code> mechanism would register the following entry
311 * with the JCA:</p>
312 *
313 * <pre>
314 * SaslClientFactory.DIGEST-MD5 com.wiz.sasl.digest.ClientFactory
315 * </pre>
316 *
317 * <p>See the "Java Cryptography Architecture API Specification &
318 * Reference" for information about how to install and configure security
319 * service providers.</p>
320 *
321 * @param mechanisms the non-null list of mechanism names to try. Each is the
322 * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
323 * @param authorizationID the possibly <code>null</code> protocol-dependent
324 * identification to be used for authorization. If <code>null</code> or
325 * empty, the server derives an authorization ID from the client's
326 * authentication credentials. When the SASL authentication completes
327 * successfully, the specified entity is granted access.
328 * @param protocol the non-null string name of the protocol for which the
329 * authentication is being performed (e.g. "ldap").
330 * @param serverName the non-null fully-qualified host name of the server to
331 * authenticate to.
332 * @param props the possibly null set of properties used to select the SASL
333 * mechanism and to configure the authentication exchange of the selected
334 * mechanism. For example, if props contains the {@link Sasl#POLICY_NOPLAINTEXT}
335 * property with the value <code>"true"</code>, then the selected SASL
336 * mechanism must not be susceptible to simple plain passive attacks. In
337 * addition to the standard properties declared in this class, other,
338 * possibly mechanism-specific, properties can be included. Properties not
339 * relevant to the selected mechanism are ignored.
340 * @param cbh the possibly <code>null</code> callback handler to used by the
341 * SASL mechanisms to get further information from the application/library to
342 * complete the authentication. For example, a SASL mechanism might require
343 * the authentication ID, password and realm from the caller. The
344 * authentication ID is requested by using a
345 * {@link javax.security.auth.callback.NameCallback}. The password is
346 * requested by using a {@link javax.security.auth.callback.PasswordCallback}.
347 * The realm is requested by using a {@link RealmChoiceCallback} if there is
348 * a list of realms to choose from, and by using a {@link RealmCallback} if
349 * the realm must be entered.
350 * @return a possibly <code>null</code> {@link SaslClient} created using the
351 * parameters supplied. If <code>null</code>, the method could not find a
352 * {@link SaslClientFactory} that will produce one.
353 * @throws SaslException if a {@link SaslClient} cannot be created because
354 * of an error.
355 */
356 public static SaslClient createSaslClient(String[] mechanisms,
357 String authorizationID,
358 String protocol,
359 String serverName,
360 Map<String, ?> props,
361 CallbackHandler cbh)
362 throws SaslException
363 {
364 if (mechanisms == null)
365 {
366 return null;
367 }
368 Provider[] providers = Security.getProviders();
369 if (providers == null || providers.length == 0)
370 {
371 return null;
372 }
373
374 SaslClient result = null;
375 SaslClientFactory factory = null;
376 String m, clazz = null, upper, alias;
377 int j;
378 Provider p;
379 for (int i = 0; i < mechanisms.length; i++)
380 {
381 m = mechanisms[i];
382 if (m == null)
383 continue;
384 for (j = 0; j < providers.length; j++)
385 {
386 p = providers[j];
387 if (p != null)
388 {
389 // try the name as is
390 clazz = p.getProperty(CLIENT_FACTORY_SVC + m);
391 if (clazz == null) // try all uppercase
392 {
393 upper = m.toUpperCase();
394 clazz = p.getProperty(CLIENT_FACTORY_SVC + upper);
395 if (clazz == null) // try if it's an alias
396 {
397 alias = p.getProperty(ALIAS + CLIENT_FACTORY_SVC + m);
398 if (alias == null) // try all-uppercase alias name
399 {
400 alias = p.getProperty(ALIAS + CLIENT_FACTORY_SVC + upper);
401 if (alias == null) // spit the dummy
402 continue;
403 }
404 clazz = p.getProperty(CLIENT_FACTORY_SVC + alias);
405 }
406 }
407 if (clazz == null)
408 continue;
409 else
410 clazz = clazz.trim();
411 }
412
413 try
414 {
415 result = null;
416 factory = (SaslClientFactory) Class.forName(clazz).newInstance();
417 result = factory.createSaslClient(mechanisms, authorizationID,
418 protocol, serverName, props, cbh);
419 }
420 catch (ClassCastException ignored) // ignore instantiation exceptions
421 {
422 }
423 catch (ClassNotFoundException ignored)
424 {
425 }
426 catch (InstantiationException ignored)
427 {
428 }
429 catch (IllegalAccessException ignored)
430 {
431 }
432 if (result != null)
433 return result;
434 }
435 }
436 return null;
437 }
438
439 /**
440 * Gets an enumeration of known factories for producing a {@link SaslClient}
441 * instance. This method uses the same sources for locating factories as
442 * <code>createSaslClient()</code>.
443 *
444 * @return a non-null {@link Enumeration} of known factories for producing a
445 * {@link SaslClient} instance.
446 * @see #createSaslClient(String[],String,String,String,Map,CallbackHandler)
447 */
448 public static Enumeration<SaslClientFactory> getSaslClientFactories()
449 {
450 Vector result = new Vector();
451 HashSet names = new HashSet();
452 Provider[] providers = Security.getProviders();
453 Iterator it;
454 if (providers != null)
455 {
456 Provider p;
457 String key;
458 for (int i = 0; i < providers.length; i++)
459 {
460 p = providers[i];
461 for (it = p.keySet().iterator(); it.hasNext(); )
462 {
463 key = (String) it.next();
464 // add key's binding (a) it is a class of a client factory,
465 // and (b) the key does not include blanks
466 if (key.startsWith(CLIENT_FACTORY_SVC) && key.indexOf(" ") == -1)
467 {
468 names.add(p.getProperty(key));
469 break;
470 }
471 }
472 }
473 }
474 // we have the factory class names in names; instantiate and enumerate
475 String c;
476 for (it = names.iterator(); it.hasNext(); )
477 {
478 c = (String) it.next();
479 try
480 {
481 SaslClientFactory f = (SaslClientFactory) Class.forName(c).newInstance();
482 if (f != null)
483 result.add(f);
484 } catch (ClassCastException ignored) { // ignore instantiation exceptions
485 } catch (ClassNotFoundException ignored) {
486 } catch (InstantiationException ignored) {
487 } catch (IllegalAccessException ignored) {
488 }
489 }
490
491 return result.elements();
492 }
493
494 /**
495 * Creates a {@link SaslServer} for the specified mechanism.
496 *
497 * <p>This method uses the JCA Security Provider Framework, described in the
498 * "Java Cryptography Architecture API Specification & Reference", for
499 * locating and selecting a SaslServer implementation.</p>
500 *
501 * <p>First, it obtains an ordered list of {@link SaslServerFactory}
502 * instances from the registered security providers for the
503 * <code>"SaslServerFactory"</code> service and the specified mechanism. It
504 * then invokes <code>createSaslServer()</code> on each factory instance on
505 * the list until one produces a non-null {@link SaslServer} instance. It
506 * returns the non-null {@link SaslServer} instance, or <code>null</code> if
507 * the search fails to produce a non-null {@link SaslServer} instance.</p>
508 *
509 * <p>A security provider for {@link SaslServerFactory} registers with the
510 * JCA Security Provider Framework keys of the form:</p>
511 *
512 * <pre>
513 * SaslServerFactory.mechanism_name
514 * </pre>
515 *
516 * <p>and values that are class names of implementations of {@link
517 * SaslServerFactory}.</p>
518 *
519 * <p>For example, a provider that contains a factory class,
520 * <code>com.wiz.sasl.digest.ServerFactory</code>, that supports the
521 * <code>"DIGEST-MD5"</code> mechanism would register the following entry
522 * with the JCA:</p>
523 *
524 * <pre>
525 * SaslServerFactory.DIGEST-MD5 com.wiz.sasl.digest.ServerFactory
526 * </pre>
527 *
528 * <p>See the "Java Cryptography Architecture API Specification &
529 * Reference" for information about how to install and configure security
530 * service providers.</p>
531 *
532 * @param mechanism the non-null mechanism name. It must be an
533 * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
534 * @param protocol the non-null string name of the protocol for which the
535 * authentication is being performed (e.g. "ldap").
536 * @param serverName the non-null fully qualified host name of the server.
537 * @param props the possibly <code>null</code> set of properties used to
538 * select the SASL mechanism and to configure the authentication exchange of
539 * the selected mechanism. For example, if props contains the {@link
540 * Sasl#POLICY_NOPLAINTEXT} property with the value <code>"true"</code>, then
541 * the selected SASL mechanism must not be susceptible to simple plain
542 * passive attacks. In addition to the standard properties declared in this
543 * class, other, possibly mechanism-specific, properties can be included.
544 * Properties not relevant to the selected mechanism are ignored.
545 * @param cbh the possibly <code>null</code> callback handler to used by the
546 * SASL mechanisms to get further information from the application/library to
547 * complete the authentication. For example, a SASL mechanism might require
548 * the authentication ID, password and realm from the caller. The
549 * authentication ID is requested by using a
550 * {@link javax.security.auth.callback.NameCallback}. The password is
551 * requested by using a {@link javax.security.auth.callback.PasswordCallback}.
552 * The realm is requested by using a {@link RealmChoiceCallback} if there is
553 * a list of realms to choose from, and by using a {@link RealmCallback} if
554 * the realm must be entered.
555 * @return a possibly <code>null</code> {@link SaslServer} created using the
556 * parameters supplied. If <code>null</code>, the method cannot find a
557 * {@link SaslServerFactory} instance that will produce one.
558 * @throws SaslException if a {@link SaslServer} instance cannot be created
559 * because of an error.
560 */
561 public static SaslServer createSaslServer(String mechanism, String protocol,
562 String serverName,
563 Map<String, ?> props,
564 CallbackHandler cbh)
565 throws SaslException
566 {
567 if (mechanism == null)
568 return null;
569 Provider[] providers = Security.getProviders();
570 if (providers == null || providers.length == 0)
571 return null;
572
573 SaslServer result = null;
574 SaslServerFactory factory = null;
575 String clazz = null, upper, alias = null;
576 int j;
577 Provider p;
578 for (j = 0; j < providers.length; j++)
579 {
580 p = providers[j];
581 if (p != null)
582 {
583 // try the name as is
584 clazz = p.getProperty(SERVER_FACTORY_SVC + mechanism);
585 if (clazz == null) // try all uppercase
586 {
587 upper = mechanism.toUpperCase();
588 clazz = p.getProperty(SERVER_FACTORY_SVC + upper);
589 if (clazz == null) // try if it's an alias
590 {
591 alias = p.getProperty(ALIAS + SERVER_FACTORY_SVC + mechanism);
592 if (alias == null) // try all-uppercase alias name
593 {
594 alias = p.getProperty(ALIAS + SERVER_FACTORY_SVC + upper);
595 if (alias == null) // spit the dummy
596 continue;
597 }
598 }
599 clazz = p.getProperty(SERVER_FACTORY_SVC + alias);
600 }
601 }
602 if (clazz == null)
603 continue;
604 else
605 clazz = clazz.trim();
606
607 try
608 {
609 result = null;
610 factory = (SaslServerFactory) Class.forName(clazz).newInstance();
611 result =
612 factory.createSaslServer(mechanism, protocol, serverName, props, cbh);
613 }
614 catch (ClassCastException ignored) // ignore instantiation exceptions
615 {
616 }
617 catch (ClassNotFoundException ignored)
618 {
619 }
620 catch (InstantiationException ignored)
621 {
622 }
623 catch (IllegalAccessException ignored)
624 {
625 }
626 if (result != null)
627 return result;
628 }
629 return null;
630 }
631
632 /**
633 * Gets an enumeration of known factories for producing a {@link SaslServer}
634 * instance. This method uses the same sources for locating factories as
635 * <code>createSaslServer()</code>.
636 *
637 * @return a non-null {@link Enumeration} of known factories for producing a
638 * {@link SaslServer} instance.
639 * @see #createSaslServer(String,String,String,Map,CallbackHandler)
640 */
641 public static Enumeration<SaslServerFactory> getSaslServerFactories()
642 {
643 Vector result = new Vector();
644 HashSet names = new HashSet();
645 Provider[] providers = Security.getProviders();
646 Iterator it;
647 if (providers != null)
648 {
649 Provider p;
650 String key;
651 for (int i = 0; i < providers.length; i++)
652 {
653 p = providers[i];
654 for (it = p.keySet().iterator(); it.hasNext(); )
655 {
656 key = (String) it.next();
657 // add key's binding (a) it is a class of a server factory,
658 // and (b) the key does not include blanks
659 if (key.startsWith(SERVER_FACTORY_SVC) && key.indexOf(" ") == -1)
660 {
661 names.add(p.getProperty(key));
662 break;
663 }
664 }
665 }
666 }
667 // we have the factory class names in names; instantiate and enumerate
668 String c;
669 for (it = names.iterator(); it.hasNext(); )
670 {
671 c = (String) it.next();
672 try
673 {
674 SaslServerFactory f = (SaslServerFactory) Class.forName(c).newInstance();
675 if (f != null)
676 result.add(f);
677 }
678 catch (ClassCastException ignored) // ignore instantiation exceptions
679 {
680 }
681 catch (ClassNotFoundException ignored)
682 {
683 }
684 catch (InstantiationException ignored)
685 {
686 }
687 catch (IllegalAccessException ignored)
688 {
689 }
690 }
691
692 return result.elements();
693 }
694 }