com.ibm.security.auth.module
Class LinuxLoginModule

java.lang.Object
  |
  +--com.ibm.security.auth.module.LinuxLoginModule

All Implemented Interfaces:

LoginModule

public class LinuxLoginModule

extends java.lang.Object

implements LoginModule

This LoginModule imports a user's Linux Principal information (UsernamePrincipal, UserIDPrincipal, and GroupIDPrincipal) and associates them with the current Subject.

This LoginModule recognizes the debug option. If set to true in the login Configuration, debug messages will be output to the output stream, System.out.

Author:

D. Kent Soper

Constructor Summary

LinuxLoginModule()

Method Summary

boolean	abort() Abort the authentication (second phase).
boolean	commit() Commit the authentication (second phase).
void	javax.security.auth.callback.CallbackHandler, java.util.Map, java.util.Map)">initialize(Subject subject, CallbackHandler callbackHandler, java.util.Map sharedState, java.util.Map options) Initialize this LoginModule.
boolean	login() Authenticate the user (first phase).
boolean	logout() Logout the user

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LinuxLoginModule

public LinuxLoginModule()

Method Detail

javax.security.auth.callback.CallbackHandler, java.util.Map, java.util.Map)">

initialize

public void initialize(Subject subject,
                       CallbackHandler callbackHandler,
                       java.util.Map sharedState,
                       java.util.Map options)

Initialize this LoginModule.

Specified by:

javax.security.auth.callback.CallbackHandler, java.util.Map, java.util.Map)">initialize in interface LoginModule

Parameters:

subject - the Subject to be authenticated.

callbackHandler - a CallbackHandler for communicating with the end user (prompting for usernames and passwords, for example).

sharedState - shared LoginModule state.

options - options specified in the login Configuration for this particular LoginModule.

login

public boolean login()
              throws LoginException

Authenticate the user (first phase).

The implementation of this method attempts to retrieve the user's Linux Subject information by making a native Linux system call.

Specified by:

login in interface LoginModule

Returns:

true in all cases (this LoginModule should not be ignored).

Throws:

FailedLoginException - if attempts to retrieve the underlying system information fail.

commit

public boolean commit()
               throws LoginException

Commit the authentication (second phase).

This method is called if the LoginContext's overall authentication succeeded (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules succeeded).

If this LoginModule's own authentication attempt succeeded (the importing of the Linux authentication information succeeded), then this method associates the Linux Principals with the Subject currently tied to the LoginModule. If this LoginModule's authentication attempted failed, then this method removes any state that was originally saved.

Specified by:

commit in interface LoginModule

Returns:

true if this LoginModule's own login and commit attempts succeeded, or false otherwise.

Throws:

LoginException - if the commit fails

abort

public boolean abort()
              throws LoginException

Abort the authentication (second phase).

This method is called if the LoginContext's overall authentication failed. (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules did not succeed).

This method cleans up any state that was originally saved as part of the authentication attempt from the login and commit methods.

Specified by:

abort in interface LoginModule

Returns:

false if this LoginModule's own login and/or commit attempts failed, and true otherwise.

Throws:

LoginException - if the abort fails

logout

public boolean logout()
               throws LoginException

Logout the user

This method removes the Principals associated with the Subject.

Specified by:

logout in interface LoginModule

Returns:

true in all cases (this LoginModule should not be ignored).

Throws:

LoginException - if the logout fails