Java™ Platform
Standard Ed. 6

javax.security.auth.login
Class Configuration

java.lang.Object
  extended by javax.security.auth.login.Configuration

public abstract class Configuration
extends Object

A Configuration object is responsible for specifying which LoginModules should be used for a particular application, and in what order the LoginModules should be invoked.

A login configuration contains the following information. Note that this example only represents the default syntax for the Configuration. Subclass implementations of this class may implement alternative syntaxes and may retrieve the Configuration from any source such as files, databases, or servers.

      Name {
              ModuleClass  Flag    ModuleOptions;
              ModuleClass  Flag    ModuleOptions;
              ModuleClass  Flag    ModuleOptions;
      };
      Name {
              ModuleClass  Flag    ModuleOptions;
              ModuleClass  Flag    ModuleOptions;
      };
      other {
              ModuleClass  Flag    ModuleOptions;
              ModuleClass  Flag    ModuleOptions;
      };
 

Each entry in the Configuration is indexed via an application name, Name, and contains a list of LoginModules configured for that application. Each LoginModule is specified via its fully qualified class name. Authentication proceeds down the module list in the exact order specified. If an application does not have specific entry, it defaults to the specific entry for "other".

The Flag value controls the overall behavior as authentication proceeds down the stack. The following represents a description of the valid values for Flag and their respective semantics:

      1) Required     - The LoginModule is required to succeed.
                        If it succeeds or fails, authentication still continues
                        to proceed down the LoginModule list.

      2) Requisite    - The LoginModule is required to succeed.
                        If it succeeds, authentication continues down the
                        LoginModule list.  If it fails,
                        control immediately returns to the application
                        (authentication does not proceed down the
                        LoginModule list).

      3) Sufficient   - The LoginModule is not required to
                        succeed.  If it does succeed, control immediately
                        returns to the application (authentication does not
                        proceed down the LoginModule list).
                        If it fails, authentication continues down the
                        LoginModule list.

      4) Optional     - The LoginModule is not required to
                        succeed.  If it succeeds or fails,
                        authentication still continues to proceed down the
                        LoginModule list.
 

The overall authentication succeeds only if all Required and Requisite LoginModules succeed. If a Sufficient LoginModule is configured and succeeds, then only the Required and Requisite LoginModules prior to that Sufficient LoginModule need to have succeeded for the overall authentication to succeed. If no Required or Requisite LoginModules are configured for an application, then at least one Sufficient or Optional LoginModule must succeed.

ModuleOptions is a space separated list of LoginModule-specific values which are passed directly to the underlying LoginModules. Options are defined by the LoginModule itself, and control the behavior within it. For example, a LoginModule may define options to support debugging/testing capabilities. The correct way to specify options in the Configuration is by using the following key-value pairing: debug="true". The key and value should be separated by an 'equals' symbol, and the value should be surrounded by double quotes. If a String in the form, ${system.property}, occurs in the value, it will be expanded to the value of the system property. Note that there is no limit to the number of options a LoginModule may define.

The following represents an example Configuration entry based on the syntax above:

 Login {
   com.sun.security.auth.module.UnixLoginModule required;
   com.sun.security.auth.module.Krb5LoginModule optional
                   useTicketCache="true"
                   ticketCache="${user.home}${/}tickets";
 };
 

This Configuration specifies that an application named, "Login", requires users to first authenticate to the com.sun.security.auth.module.UnixLoginModule, which is required to succeed. Even if the UnixLoginModule authentication fails, the com.sun.security.auth.module.Krb5LoginModule still gets invoked. This helps hide the source of failure. Since the Krb5LoginModule is Optional, the overall authentication succeeds only if the UnixLoginModule (Required) succeeds.

Also note that the LoginModule-specific options, useTicketCache="true" and ticketCache=${user.home}${/}tickets", are passed to the Krb5LoginModule. These options instruct the Krb5LoginModule to use the ticket cache at the specified location. The system properties, user.home and / (file.separator), are expanded to their respective values.

There is only one Configuration object installed in the runtime at any given time. A Configuration object can be installed by calling the setConfiguration method. The installed Configuration object can be obtained by calling the getConfiguration method.

If no Configuration object has been installed in the runtime, a call to getConfiguration installs an instance of the default Configuration implementation (a default subclass implementation of this abstract class). The default Configuration implementation can be changed by setting the value of the "login.configuration.provider" security property (in the Java security properties file) to the fully qualified name of the desired Configuration subclass implementation. The Java security properties file is located in the file named <JAVA_HOME>/lib/security/java.security. <JAVA_HOME> refers to the value of the java.home system property, and specifies the directory where the JRE is installed.

Application code can directly subclass Configuration to provide a custom implementation. In addition, an instance of a Configuration object can be constructed by invoking one of the getInstance factory methods with a standard type. The default policy type is "JavaLoginConfig". See Appendix A in the Java Cryptography Architecture API Specification & Reference for a list of standard Configuration types.

See Also:
LoginContext

Nested Class Summary
static interface Configuration.Parameters
          This represents a marker interface for Configuration parameters.
 
Constructor Summary
protected Configuration()
          Sole constructor.
 
Method Summary
abstract  AppConfigurationEntry[] getAppConfigurationEntry(String name)
          Retrieve the AppConfigurationEntries for the specified name from this Configuration.
static Configuration getConfiguration()
          Get the installed login Configuration.
static Configuration getInstance(String type, Configuration.Parameters params)
          Returns a Configuration object of the specified type.
static Configuration getInstance(String type, Configuration.Parameters params, Provider provider)
          Returns a Configuration object of the specified type.
static Configuration getInstance(String type, Configuration.Parameters params, String provider)
          Returns a Configuration object of the specified type.
 Configuration.Parameters getParameters()
          Return Configuration parameters.
 Provider getProvider()
          Return the Provider of this Configuration.
 String getType()
          Return the type of this Configuration.
 void refresh()
          Refresh and reload the Configuration.
static void setConfiguration(Configuration configuration)
          Set the login Configuration.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Configuration

protected Configuration()
Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

getConfiguration

public static Configuration getConfiguration()
Get the installed login Configuration.

Returns:
the login Configuration. If a Configuration object was set via the Configuration.setConfiguration method, then that object is returned. Otherwise, a default Configuration object is returned.
Throws:
SecurityException - if the caller does not have permission to retrieve the Configuration.
See Also:
setConfiguration(javax.security.auth.login.Configuration)

setConfiguration

public static void setConfiguration(Configuration configuration)
Set the login Configuration.

Parameters:
configuration - the new Configuration
Throws:
SecurityException - if the current thread does not have Permission to set the Configuration.
See Also:
getConfiguration()

getInstance

public static Configuration getInstance(String type,
                                        Configuration.Parameters params)
                                 throws NoSuchAlgorithmException
Returns a Configuration object of the specified type.

This method traverses the list of registered security providers, starting with the most preferred Provider. A new Configuration object encapsulating the ConfigurationSpi implementation from the first Provider that supports the specified type is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters:
type - the specified Configuration type. See Appendix A in the Java Cryptography Architecture API Specification & Reference for a list of standard Configuration types.
params - parameters for the Configuration, which may be null.
Returns:
the new Configuration object.
Throws:
SecurityException - if the caller does not have permission to get a Configuration instance for the specified type.
NullPointerException - if the specified type is null.
IllegalArgumentException - if the specified parameters are not understood by the ConfigurationSpi implementation from the selected Provider.
NoSuchAlgorithmException - if no Provider supports a ConfigurationSpi implementation for the specified type.
Since:
1.6
See Also:
Provider

getInstance

public static Configuration getInstance(String type,
                                        Configuration.Parameters params,
                                        String provider)
                                 throws NoSuchProviderException,
                                        NoSuchAlgorithmException
Returns a Configuration object of the specified type.

A new Configuration object encapsulating the ConfigurationSpi implementation from the specified provider is returned. The specified provider must be registered in the provider list.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters:
type - the specified Configuration type. See Appendix A in the Java Cryptography Architecture API Specification & Reference for a list of standard Configuration types.
params - parameters for the Configuration, which may be null.
provider - the provider.
Returns:
the new Configuration object.
Throws:
SecurityException - if the caller does not have permission to get a Configuration instance for the specified type.
NullPointerException - if the specified type is null.
IllegalArgumentException - if the specified provider is null or empty, or if the specified parameters are not understood by the ConfigurationSpi implementation from the specified provider.
NoSuchProviderException - if the specified provider is not registered in the security provider list.
NoSuchAlgorithmException - if the specified provider does not support a ConfigurationSpi implementation for the specified type.
Since:
1.6
See Also:
Provider

getInstance

public static Configuration getInstance(String type,
                                        Configuration.Parameters params,
                                        Provider provider)
                                 throws NoSuchAlgorithmException
Returns a Configuration object of the specified type.

A new Configuration object encapsulating the ConfigurationSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.

Parameters:
type - the specified Configuration type. See Appendix A in the Java Cryptography Architecture API Specification & Reference for a list of standard Configuration types.
params - parameters for the Configuration, which may be null.
provider - the Provider.
Returns:
the new Configuration object.
Throws:
SecurityException - if the caller does not have permission to get a Configuration instance for the specified type.
NullPointerException - if the specified type is null.
IllegalArgumentException - if the specified Provider is null, or if the specified parameters are not understood by the ConfigurationSpi implementation from the specified Provider.
NoSuchAlgorithmException - if the specified Provider does not support a ConfigurationSpi implementation for the specified type.
Since:
1.6
See Also:
Provider

getProvider

public Provider getProvider()
Return the Provider of this Configuration.

This Configuration instance will only have a Provider if it was obtained via a call to Configuration.getInstance. Otherwise this method returns null.

Returns:
the Provider of this Configuration, or null.
Since:
1.6

getType

public String getType()
Return the type of this Configuration.

This Configuration instance will only have a type if it was obtained via a call to Configuration.getInstance. Otherwise this method returns null.

Returns:
the type of this Configuration, or null.
Since:
1.6

getParameters

public Configuration.Parameters getParameters()
Return Configuration parameters.

This Configuration instance will only have parameters if it was obtained via a call to Configuration.getInstance. Otherwise this method returns null.

Returns:
Configuration parameters, or null.
Since:
1.6

getAppConfigurationEntry

public abstract AppConfigurationEntry[] getAppConfigurationEntry(String name)
Retrieve the AppConfigurationEntries for the specified name from this Configuration.

Parameters:
name - the name used to index the Configuration.
Returns:
an array of AppConfigurationEntries for the specified name from this Configuration, or null if there are no entries for the specified name

refresh

public void refresh()
Refresh and reload the Configuration.

This method causes this Configuration object to refresh/reload its contents in an implementation-dependent manner. For example, if this Configuration object stores its entries in a file, calling refresh may cause the file to be re-read.

The default implementation of this method does nothing. This method should be overridden if a refresh operation is supported by the implementation.

Throws:
SecurityException - if the caller does not have permission to refresh its Configuration.

Java™ Platform
Standard Ed. 6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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