| /* | |
| * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved. | |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| * | |
| * This code is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License version 2 only, as | |
| * published by the Free Software Foundation. Oracle designates this | |
| * particular file as subject to the "Classpath" exception as provided | |
| * by Oracle in the LICENSE file that accompanied this code. | |
| * | |
| * This code 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 | |
| * version 2 for more details (a copy is included in the LICENSE file that | |
| * accompanied this code). | |
| * | |
| * You should have received a copy of the GNU General Public License version | |
| * 2 along with this work; if not, write to the Free Software Foundation, | |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| * | |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| * or visit www.oracle.com if you need additional information or have any | |
| * questions. | |
| */ | |
| package javax.security.sasl; | |
| import javax.security.auth.callback.CallbackHandler; | |
| import java.util.ArrayList; | |
| import java.util.Enumeration; | |
| import java.util.Iterator; | |
| import java.util.List; | |
| import java.util.Map; | |
| import java.util.Set; | |
| import java.util.HashSet; | |
| import java.util.Collections; | |
| import java.security.InvalidParameterException; | |
| import java.security.NoSuchAlgorithmException; | |
| import java.security.Provider; | |
| import java.security.Provider.Service; | |
| import java.security.Security; | |
| import java.util.logging.Level; | |
| import java.util.logging.Logger; | |
| /** | |
| * A static class for creating SASL clients and servers. | |
| *<p> | |
| * This class defines the policy of how to locate, load, and instantiate | |
| * SASL clients and servers. | |
| *<p> | |
| * For example, an application or library gets a SASL client by doing | |
| * something like: | |
| *<blockquote><pre> | |
| * SaslClient sc = Sasl.createSaslClient(mechanisms, | |
| * authorizationId, protocol, serverName, props, callbackHandler); | |
| *</pre></blockquote> | |
| * It can then proceed to use the instance to create an authentication connection. | |
| *<p> | |
| * Similarly, a server gets a SASL server by using code that looks as follows: | |
| *<blockquote><pre> | |
| * SaslServer ss = Sasl.createSaslServer(mechanism, | |
| * protocol, serverName, props, callbackHandler); | |
| *</pre></blockquote> | |
| * | |
| * @since 1.5 | |
| * | |
| * @author Rosanna Lee | |
| * @author Rob Weltman | |
| */ | |
| public class Sasl { | |
| private static List<String> disabledMechanisms = new ArrayList<>(); | |
| static { | |
| String prop = Security.getProperty("jdk.sasl.disabledMechanisms"); | |
| if (prop != null) { | |
| for (String s : prop.split("\\s*,\\s*")) { | |
| if (!s.isEmpty()) { | |
| disabledMechanisms.add(s); | |
| } | |
| } | |
| } | |
| } | |
| private static final String SASL_LOGGER_NAME = "javax.security.sasl"; | |
| /** | |
| * Logger for debug messages | |
| */ | |
| private static final Logger logger = Logger.getLogger(SASL_LOGGER_NAME); | |
| // Cannot create one of these | |
| private Sasl() { | |
| } | |
| /** | |
| * The name of a property that specifies the quality-of-protection to use. | |
| * The property contains a comma-separated, ordered list | |
| * of quality-of-protection values that the | |
| * client or server is willing to support. A qop value is one of | |
| * <ul> | |
| * <li>{@code "auth"} - authentication only</li> | |
| * <li>{@code "auth-int"} - authentication plus integrity protection</li> | |
| * <li>{@code "auth-conf"} - authentication plus integrity and confidentiality | |
| * protection</li> | |
| * </ul> | |
| * | |
| * The order of the list specifies the preference order of the client or | |
| * server. If this property is absent, the default qop is {@code "auth"}. | |
| * The value of this constant is {@code "javax.security.sasl.qop"}. | |
| */ | |
| public static final String QOP = "javax.security.sasl.qop"; | |
| /** | |
| * The name of a property that specifies the cipher strength to use. | |
| * The property contains a comma-separated, ordered list | |
| * of cipher strength values that | |
| * the client or server is willing to support. A strength value is one of | |
| * <ul> | |
| * <li>{@code "low"}</li> | |
| * <li>{@code "medium"}</li> | |
| * <li>{@code "high"}</li> | |
| * </ul> | |
| * The order of the list specifies the preference order of the client or | |
| * server. An implementation should allow configuration of the meaning | |
| * of these values. An application may use the Java Cryptography | |
| * Extension (JCE) with JCE-aware mechanisms to control the selection of | |
| * cipher suites that match the strength values. | |
| * <BR> | |
| * If this property is absent, the default strength is | |
| * {@code "high,medium,low"}. | |
| * The value of this constant is {@code "javax.security.sasl.strength"}. | |
| */ | |
| public static final String STRENGTH = "javax.security.sasl.strength"; | |
| /** | |
| * The name of a property that specifies whether the | |
| * server must authenticate to the client. The property contains | |
| * {@code "true"} if the server must | |
| * authenticate the to client; {@code "false"} otherwise. | |
| * The default is {@code "false"}. | |
| * <br>The value of this constant is | |
| * {@code "javax.security.sasl.server.authentication"}. | |
| */ | |
| public static final String SERVER_AUTH = | |
| "javax.security.sasl.server.authentication"; | |
| /** | |
| * The name of a property that specifies the bound server name for | |
| * an unbound server. A server is created as an unbound server by setting | |
| * the {@code serverName} argument in {@link #createSaslServer} as null. | |
| * The property contains the bound host name after the authentication | |
| * exchange has completed. It is only available on the server side. | |
| * <br>The value of this constant is | |
| * {@code "javax.security.sasl.bound.server.name"}. | |
| */ | |
| public static final String BOUND_SERVER_NAME = | |
| "javax.security.sasl.bound.server.name"; | |
| /** | |
| * The name of a property that specifies the maximum size of the receive | |
| * buffer in bytes of {@code SaslClient}/{@code SaslServer}. | |
| * The property contains the string representation of an integer. | |
| * <br>If this property is absent, the default size | |
| * is defined by the mechanism. | |
| * <br>The value of this constant is {@code "javax.security.sasl.maxbuffer"}. | |
| */ | |
| public static final String MAX_BUFFER = "javax.security.sasl.maxbuffer"; | |
| /** | |
| * The name of a property that specifies the maximum size of the raw send | |
| * buffer in bytes of {@code SaslClient}/{@code SaslServer}. | |
| * The property contains the string representation of an integer. | |
| * The value of this property is negotiated between the client and server | |
| * during the authentication exchange. | |
| * <br>The value of this constant is {@code "javax.security.sasl.rawsendsize"}. | |
| */ | |
| public static final String RAW_SEND_SIZE = "javax.security.sasl.rawsendsize"; | |
| /** | |
| * The name of a property that specifies whether to reuse previously | |
| * authenticated session information. The property contains "true" if the | |
| * mechanism implementation may attempt to reuse previously authenticated | |
| * session information; it contains "false" if the implementation must | |
| * not reuse previously authenticated session information. A setting of | |
| * "true" serves only as a hint: it does not necessarily entail actual | |
| * reuse because reuse might not be possible due to a number of reasons, | |
| * including, but not limited to, lack of mechanism support for reuse, | |
| * expiration of reusable information, and the peer's refusal to support | |
| * reuse. | |
| * | |
| * The property's default value is "false". The value of this constant | |
| * is "javax.security.sasl.reuse". | |
| * | |
| * Note that all other parameters and properties required to create a | |
| * SASL client/server instance must be provided regardless of whether | |
| * this property has been supplied. That is, you cannot supply any less | |
| * information in anticipation of reuse. | |
| * | |
| * Mechanism implementations that support reuse might allow customization | |
| * of its implementation, for factors such as cache size, timeouts, and | |
| * criteria for reusability. Such customizations are | |
| * implementation-dependent. | |
| */ | |
| public static final String REUSE = "javax.security.sasl.reuse"; | |
| /** | |
| * The name of a property that specifies | |
| * whether mechanisms susceptible to simple plain passive attacks (e.g., | |
| * "PLAIN") are not permitted. The property | |
| * contains {@code "true"} if such mechanisms are not permitted; | |
| * {@code "false"} if such mechanisms are permitted. | |
| * The default is {@code "false"}. | |
| * <br>The value of this constant is | |
| * {@code "javax.security.sasl.policy.noplaintext"}. | |
| */ | |
| public static final String POLICY_NOPLAINTEXT = | |
| "javax.security.sasl.policy.noplaintext"; | |
| /** | |
| * The name of a property that specifies whether | |
| * mechanisms susceptible to active (non-dictionary) attacks | |
| * are not permitted. | |
| * The property contains {@code "true"} | |
| * if mechanisms susceptible to active attacks | |
| * are not permitted; {@code "false"} if such mechanisms are permitted. | |
| * The default is {@code "false"}. | |
| * <br>The value of this constant is | |
| * {@code "javax.security.sasl.policy.noactive"}. | |
| */ | |
| public static final String POLICY_NOACTIVE = | |
| "javax.security.sasl.policy.noactive"; | |
| /** | |
| * The name of a property that specifies whether | |
| * mechanisms susceptible to passive dictionary attacks are not permitted. | |
| * The property contains {@code "true"} | |
| * if mechanisms susceptible to dictionary attacks are not permitted; | |
| * {@code "false"} if such mechanisms are permitted. | |
| * The default is {@code "false"}. | |
| *<br> | |
| * The value of this constant is | |
| * {@code "javax.security.sasl.policy.nodictionary"}. | |
| */ | |
| public static final String POLICY_NODICTIONARY = | |
| "javax.security.sasl.policy.nodictionary"; | |
| /** | |
| * The name of a property that specifies whether mechanisms that accept | |
| * anonymous login are not permitted. The property contains {@code "true"} | |
| * if mechanisms that accept anonymous login are not permitted; | |
| * {@code "false"} | |
| * if such mechanisms are permitted. The default is {@code "false"}. | |
| *<br> | |
| * The value of this constant is | |
| * {@code "javax.security.sasl.policy.noanonymous"}. | |
| */ | |
| public static final String POLICY_NOANONYMOUS = | |
| "javax.security.sasl.policy.noanonymous"; | |
| /** | |
| * The name of a property that specifies whether mechanisms that implement | |
| * forward secrecy between sessions are required. Forward secrecy | |
| * means that breaking into one session will not automatically | |
| * provide information for breaking into future sessions. | |
| * The property | |
| * contains {@code "true"} if mechanisms that implement forward secrecy | |
| * between sessions are required; {@code "false"} if such mechanisms | |
| * are not required. The default is {@code "false"}. | |
| *<br> | |
| * The value of this constant is | |
| * {@code "javax.security.sasl.policy.forward"}. | |
| */ | |
| public static final String POLICY_FORWARD_SECRECY = | |
| "javax.security.sasl.policy.forward"; | |
| /** | |
| * The name of a property that specifies whether | |
| * mechanisms that pass client credentials are required. The property | |
| * contains {@code "true"} if mechanisms that pass | |
| * client credentials are required; {@code "false"} | |
| * if such mechanisms are not required. The default is {@code "false"}. | |
| *<br> | |
| * The value of this constant is | |
| * {@code "javax.security.sasl.policy.credentials"}. | |
| */ | |
| public static final String POLICY_PASS_CREDENTIALS = | |
| "javax.security.sasl.policy.credentials"; | |
| /** | |
| * The name of a property that specifies the credentials to use. | |
| * The property contains a mechanism-specific Java credential object. | |
| * Mechanism implementations may examine the value of this property | |
| * to determine whether it is a class that they support. | |
| * The property may be used to supply credentials to a mechanism that | |
| * supports delegated authentication. | |
| *<br> | |
| * The value of this constant is | |
| * {@code "javax.security.sasl.credentials"}. | |
| */ | |
| public static final String CREDENTIALS = "javax.security.sasl.credentials"; | |
| /** | |
| * Creates a {@code SaslClient} using the parameters supplied. | |
| * | |
| * This method uses the | |
| * {@extLink security_guide_jca JCA Security Provider Framework}, | |
| * described in the | |
| * "Java Cryptography Architecture (JCA) Reference Guide", for | |
| * locating and selecting a {@code SaslClient} implementation. | |
| * | |
| * First, it | |
| * obtains an ordered list of {@code SaslClientFactory} instances from | |
| * the registered security providers for the "SaslClientFactory" service | |
| * and the specified SASL mechanism(s). It then invokes | |
| * {@code createSaslClient()} on each factory instance on the list | |
| * until one produces a non-null {@code SaslClient} instance. It returns | |
| * the non-null {@code SaslClient} instance, or null if the search fails | |
| * to produce a non-null {@code SaslClient} instance. | |
| *<p> | |
| * A security provider for SaslClientFactory registers with the | |
| * JCA Security Provider Framework keys of the form <br> | |
| * {@code SaslClientFactory.}<em>{@code mechanism_name}</em> | |
| * <br> | |
| * and values that are class names of implementations of | |
| * {@code javax.security.sasl.SaslClientFactory}. | |
| * | |
| * For example, a provider that contains a factory class, | |
| * {@code com.wiz.sasl.digest.ClientFactory}, that supports the | |
| * "DIGEST-MD5" mechanism would register the following entry with the JCA: | |
| * {@code SaslClientFactory.DIGEST-MD5 com.wiz.sasl.digest.ClientFactory} | |
| *<p> | |
| * See the | |
| * "Java Cryptography Architecture API Specification & Reference" | |
| * for information about how to install and configure security service | |
| * providers. | |
| * | |
| * @implNote | |
| * The JDK Reference Implementation additionally uses the | |
| * {@code jdk.security.provider.preferred} | |
| * {@link Security#getProperty(String) Security} property to determine | |
| * the preferred provider order for the specified algorithm. This | |
| * may be different than the order of providers returned by | |
| * {@link Security#getProviders() Security.getProviders()}. | |
| * <p> | |
| * If a mechanism is listed in the {@code jdk.sasl.disabledMechanisms} | |
| * security property, it will be ignored and won't be negotiated. | |
| * | |
| * @param mechanisms The non-null list of mechanism names to try. Each is the | |
| * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5"). | |
| * @param authorizationId The possibly null protocol-dependent | |
| * identification to be used for authorization. | |
| * If null or empty, the server derives an authorization | |
| * ID from the client's authentication credentials. | |
| * When the SASL authentication completes successfully, | |
| * the specified entity is granted access. | |
| * | |
| * @param protocol The non-null string name of the protocol for which | |
| * the authentication is being performed (e.g., "ldap"). | |
| * | |
| * @param serverName The non-null fully-qualified host name of the server | |
| * to authenticate to. | |
| * | |
| * @param props The possibly null set of properties used to | |
| * select the SASL mechanism and to configure the authentication | |
| * exchange of the selected mechanism. | |
| * For example, if {@code props} contains the | |
| * {@code Sasl.POLICY_NOPLAINTEXT} property with the value | |
| * {@code "true"}, then the selected | |
| * SASL mechanism must not be susceptible to simple plain passive attacks. | |
| * In addition to the standard properties declared in this class, | |
| * other, possibly mechanism-specific, properties can be included. | |
| * Properties not relevant to the selected mechanism are ignored, | |
| * including any map entries with non-String keys. | |
| * | |
| * @param cbh The possibly null callback handler to used by the SASL | |
| * mechanisms to get further information from the application/library | |
| * to complete the authentication. For example, a SASL mechanism might | |
| * require the authentication ID, password and realm from the caller. | |
| * The authentication ID is requested by using a {@code NameCallback}. | |
| * The password is requested by using a {@code PasswordCallback}. | |
| * The realm is requested by using a {@code RealmChoiceCallback} if there is a list | |
| * of realms to choose from, and by using a {@code RealmCallback} if | |
| * the realm must be entered. | |
| * | |
| *@return A possibly null {@code SaslClient} created using the parameters | |
| * supplied. If null, cannot find a {@code SaslClientFactory} | |
| * that will produce one. | |
| *@exception SaslException If cannot create a {@code SaslClient} because | |
| * of an error. | |
| */ | |
| public static SaslClient createSaslClient( | |
| String[] mechanisms, | |
| String authorizationId, | |
| String protocol, | |
| String serverName, | |
| Map<String,?> props, | |
| CallbackHandler cbh) throws SaslException { | |
| SaslClient mech = null; | |
| SaslClientFactory fac; | |
| Service service; | |
| String mechName; | |
| for (int i = 0; i < mechanisms.length; i++) { | |
| if ((mechName=mechanisms[i]) == null) { | |
| throw new NullPointerException( | |
| "Mechanism name cannot be null"); | |
| } else if (mechName.length() == 0) { | |
| continue; | |
| } else if (isDisabled(mechName)) { | |
| logger.log(Level.FINE, | |
| "Disabled " + mechName + " mechanism ignored"); | |
| continue; | |
| } | |
| String type = "SaslClientFactory"; | |
| Provider[] provs = Security.getProviders(type + "." + mechName); | |
| if (provs != null) { | |
| for (Provider p : provs) { | |
| service = p.getService(type, mechName); | |
| if (service == null) { | |
| // no such service exists | |
| continue; | |
| } | |
| fac = (SaslClientFactory) loadFactory(service); | |
| if (fac != null) { | |
| mech = fac.createSaslClient( | |
| new String[]{mechanisms[i]}, authorizationId, | |
| protocol, serverName, props, cbh); | |
| if (mech != null) { | |
| return mech; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| return null; | |
| } | |
| private static Object loadFactory(Service service) | |
| throws SaslException { | |
| try { | |
| /* | |
| * Load the implementation class with the same class loader | |
| * that was used to load the provider. | |
| * In order to get the class loader of a class, the | |
| * caller's class loader must be the same as or an ancestor of | |
| * the class loader being returned. | |
| */ | |
| return service.newInstance(null); | |
| } catch (InvalidParameterException | NoSuchAlgorithmException e) { | |
| throw new SaslException("Cannot instantiate service " + service, e); | |
| } | |
| } | |
| /** | |
| * Creates a {@code SaslServer} for the specified mechanism. | |
| * | |
| * This method uses the | |
| * {@extLink security_guide_jca JCA Security Provider Framework}, | |
| * described in the | |
| * "Java Cryptography Architecture (JCA) Reference Guide", for | |
| * locating and selecting a {@code SaslClient} implementation. | |
| * | |
| * First, it | |
| * obtains an ordered list of {@code SaslServerFactory} instances from | |
| * the registered security providers for the "SaslServerFactory" service | |
| * and the specified mechanism. It then invokes | |
| * {@code createSaslServer()} on each factory instance on the list | |
| * until one produces a non-null {@code SaslServer} instance. It returns | |
| * the non-null {@code SaslServer} instance, or null if the search fails | |
| * to produce a non-null {@code SaslServer} instance. | |
| *<p> | |
| * A security provider for SaslServerFactory registers with the | |
| * JCA Security Provider Framework keys of the form <br> | |
| * {@code SaslServerFactory.}<em>{@code mechanism_name}</em> | |
| * <br> | |
| * and values that are class names of implementations of | |
| * {@code javax.security.sasl.SaslServerFactory}. | |
| * | |
| * For example, a provider that contains a factory class, | |
| * {@code com.wiz.sasl.digest.ServerFactory}, that supports the | |
| * "DIGEST-MD5" mechanism would register the following entry with the JCA: | |
| * {@code SaslServerFactory.DIGEST-MD5 com.wiz.sasl.digest.ServerFactory} | |
| *<p> | |
| * See the | |
| * "Java Cryptography Architecture API Specification & Reference" | |
| * for information about how to install and configure security | |
| * service providers. | |
| * | |
| * @implNote | |
| * The JDK Reference Implementation additionally uses the | |
| * {@code jdk.security.provider.preferred} | |
| * {@link Security#getProperty(String) Security} property to determine | |
| * the preferred provider order for the specified algorithm. This | |
| * may be different than the order of providers returned by | |
| * {@link Security#getProviders() Security.getProviders()}. | |
| * <p> | |
| * If {@code mechanism} is listed in the {@code jdk.sasl.disabledMechanisms} | |
| * security property, it will be ignored and this method returns {@code null}. | |
| * | |
| * @param mechanism The non-null mechanism name. It must be an | |
| * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5"). | |
| * @param protocol The non-null string name of the protocol for which | |
| * the authentication is being performed (e.g., "ldap"). | |
| * @param serverName The fully qualified host name of the server, or null | |
| * if the server is not bound to any specific host name. If the mechanism | |
| * does not allow an unbound server, a {@code SaslException} will | |
| * be thrown. | |
| * @param props The possibly null set of properties used to | |
| * select the SASL mechanism and to configure the authentication | |
| * exchange of the selected mechanism. | |
| * For example, if {@code props} contains the | |
| * {@code Sasl.POLICY_NOPLAINTEXT} property with the value | |
| * {@code "true"}, then the selected | |
| * SASL mechanism must not be susceptible to simple plain passive attacks. | |
| * In addition to the standard properties declared in this class, | |
| * other, possibly mechanism-specific, properties can be included. | |
| * Properties not relevant to the selected mechanism are ignored, | |
| * including any map entries with non-String keys. | |
| * | |
| * @param cbh The possibly null callback handler to used by the SASL | |
| * mechanisms to get further information from the application/library | |
| * to complete the authentication. For example, a SASL mechanism might | |
| * require the authentication ID, password and realm from the caller. | |
| * The authentication ID is requested by using a {@code NameCallback}. | |
| * The password is requested by using a {@code PasswordCallback}. | |
| * The realm is requested by using a {@code RealmChoiceCallback} if there is a list | |
| * of realms to choose from, and by using a {@code RealmCallback} if | |
| * the realm must be entered. | |
| * | |
| *@return A possibly null {@code SaslServer} created using the parameters | |
| * supplied. If null, cannot find a {@code SaslServerFactory} | |
| * that will produce one. | |
| *@exception SaslException If cannot create a {@code SaslServer} because | |
| * of an error. | |
| **/ | |
| public static SaslServer | |
| createSaslServer(String mechanism, | |
| String protocol, | |
| String serverName, | |
| Map<String,?> props, | |
| javax.security.auth.callback.CallbackHandler cbh) | |
| throws SaslException { | |
| SaslServer mech = null; | |
| SaslServerFactory fac; | |
| Service service; | |
| if (mechanism == null) { | |
| throw new NullPointerException("Mechanism name cannot be null"); | |
| } else if (mechanism.length() == 0) { | |
| return null; | |
| } else if (isDisabled(mechanism)) { | |
| logger.log(Level.FINE, | |
| "Disabled " + mechanism + " mechanism ignored"); | |
| return null; | |
| } | |
| String type = "SaslServerFactory"; | |
| Provider[] provs = Security.getProviders(type + "." + mechanism); | |
| if (provs != null) { | |
| for (Provider p : provs) { | |
| service = p.getService(type, mechanism); | |
| if (service == null) { | |
| throw new SaslException("Provider does not support " + | |
| mechanism + " " + type); | |
| } | |
| fac = (SaslServerFactory) loadFactory(service); | |
| if (fac != null) { | |
| mech = fac.createSaslServer( | |
| mechanism, protocol, serverName, props, cbh); | |
| if (mech != null) { | |
| return mech; | |
| } | |
| } | |
| } | |
| } | |
| return null; | |
| } | |
| /** | |
| * Gets an enumeration of known factories for producing {@code SaslClient}. | |
| * This method uses the same algorithm for locating factories as | |
| * {@code createSaslClient()}. | |
| * @return A non-null enumeration of known factories for producing | |
| * {@code SaslClient}. | |
| * @see #createSaslClient | |
| */ | |
| public static Enumeration<SaslClientFactory> getSaslClientFactories() { | |
| Set<Object> facs = getFactories("SaslClientFactory"); | |
| final Iterator<Object> iter = facs.iterator(); | |
| return new Enumeration<SaslClientFactory>() { | |
| public boolean hasMoreElements() { | |
| return iter.hasNext(); | |
| } | |
| public SaslClientFactory nextElement() { | |
| return (SaslClientFactory)iter.next(); | |
| } | |
| }; | |
| } | |
| /** | |
| * Gets an enumeration of known factories for producing {@code SaslServer}. | |
| * This method uses the same algorithm for locating factories as | |
| * {@code createSaslServer()}. | |
| * @return A non-null enumeration of known factories for producing | |
| * {@code SaslServer}. | |
| * @see #createSaslServer | |
| */ | |
| public static Enumeration<SaslServerFactory> getSaslServerFactories() { | |
| Set<Object> facs = getFactories("SaslServerFactory"); | |
| final Iterator<Object> iter = facs.iterator(); | |
| return new Enumeration<SaslServerFactory>() { | |
| public boolean hasMoreElements() { | |
| return iter.hasNext(); | |
| } | |
| public SaslServerFactory nextElement() { | |
| return (SaslServerFactory)iter.next(); | |
| } | |
| }; | |
| } | |
| private static Set<Object> getFactories(String serviceName) { | |
| HashSet<Object> result = new HashSet<Object>(); | |
| if ((serviceName == null) || (serviceName.length() == 0) || | |
| (serviceName.endsWith("."))) { | |
| return result; | |
| } | |
| Provider[] provs = Security.getProviders(); | |
| Object fac; | |
| for (Provider p : provs) { | |
| Iterator<Service> iter = p.getServices().iterator(); | |
| while (iter.hasNext()) { | |
| Service s = iter.next(); | |
| if (s.getType().equals(serviceName)) { | |
| try { | |
| fac = loadFactory(s); | |
| if (fac != null) { | |
| result.add(fac); | |
| } | |
| } catch (Exception ignore) { | |
| } | |
| } | |
| } | |
| } | |
| return Collections.unmodifiableSet(result); | |
| } | |
| private static boolean isDisabled(String name) { | |
| return disabledMechanisms.contains(name); | |
| } | |
| } |