Class JndiLoginModule

public class JndiLoginModule
extends Object
implements LoginModule

The module prompts for a username and password and then verifies the password against the password stored in a directory service configured under JNDI.

This LoginModule interoperates with any conformant JNDI service provider. To direct this LoginModule to use a specific JNDI service provider, two options must be specified in the login Configuration for this LoginModule.

user.provider.url=name_service_url
      group.provider.url=name_service_url

name_service_url specifies the directory service and path where this LoginModule can access the relevant user and group information. Because this LoginModule only performs one-level searches to find the relevant user information, the URL must point to a directory one level above where the user and group information is stored in the directory service. For example, to instruct this LoginModule to contact a NIS server, the following URLs must be specified:

user.provider.url="nis://NISServerHostName/NISDomain/user"
    group.provider.url="nis://NISServerHostName/NISDomain/system/group"

NISServerHostName specifies the server host name of the NIS server (for example, nis.sun.com, and NISDomain specifies the domain for that NIS server (for example, jaas.sun.com. To contact an LDAP server, the following URLs must be specified:

user.provider.url="ldap://LDAPServerHostName/LDAPName"
    group.provider.url="ldap://LDAPServerHostName/LDAPName"

LDAPServerHostName specifies the server host name of the LDAP server, which may include a port number (for example, ldap.sun.com:389), and LDAPName specifies the entry name in the LDAP directory (for example, ou=People,o=Sun,c=US and ou=Groups,o=Sun,c=US for user and group information, respectively).

The format in which the user's information must be stored in the directory service is specified in RFC 2307. Specifically, this LoginModule will search for the user's entry in the directory service using the user's uid attribute, where uid=username. If the search succeeds, this LoginModule will then obtain the user's encrypted password from the retrieved entry using the userPassword attribute. This LoginModule assumes that the password is stored as a byte array, which when converted to a String, has the following format:

"{crypt}encrypted_password"

The LDAP directory server must be configured to permit read access to the userPassword attribute. If the user entered a valid username and password, this LoginModule associates a UnixPrincipal, UnixNumericUserPrincipal, and the relevant UnixNumericGroupPrincipals with the Subject.

This LoginModule also recognizes the following Configuration options:

debug          if, true, debug messages are output to System.out.

    useFirstPass   if, true, this LoginModule retrieves the
                   username and password from the module's shared state,
                   using "javax.security.auth.login.name" and
                   "javax.security.auth.login.password" as the respective
                   keys.  The retrieved values are used for authentication.
                   If authentication fails, no attempt for a retry is made,
                   and the failure is reported back to the calling
                   application.

    tryFirstPass   if, true, this LoginModule retrieves the
                   the username and password from the module's shared state,
                   using "javax.security.auth.login.name" and
                   "javax.security.auth.login.password" as the respective
                   keys.  The retrieved values are used for authentication.
                   If authentication fails, the module uses the
                   CallbackHandler to retrieve a new username and password,
                   and another attempt to authenticate is made.
                   If the authentication fails, the failure is reported
                   back to the calling application.

    storePass      if, true, this LoginModule stores the username and password
                   obtained from the CallbackHandler in the module's
                   shared state, using "javax.security.auth.login.name" and
                   "javax.security.auth.login.password" as the respective
                   keys.  This is not performed if existing values already
                   exist for the username and password in the shared state,
                   or if authentication fails.

    clearPass     if, true, this LoginModule clears the
                  username and password stored in the module's shared state
                  after both phases of authentication (login and commit)
                  have completed.

Fields

USER_PROVIDER

public final String USER_PROVIDER

JNDI Provider

See Also:

Constant Field Values

GROUP_PROVIDER

public final String GROUP_PROVIDER

See Also:

Constant Field Values

Constructors

JndiLoginModule

public JndiLoginModule()

Methods

initialize

public void initialize(Subject subject,
                       CallbackHandler callbackHandler,
                       Map<String,​?> sharedState,
                       Map<String,​?> options)

Initialize this LoginModule.

Specified by:

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

Prompt for username and password. Verify the password against the relevant name service.

Specified by:

login in interface LoginModule

Returns:

true always, since this LoginModule should not be ignored.

Throws:

FailedLoginException - if the authentication fails.

LoginException - if this LoginModule is unable to perform the authentication.

commit

public boolean commit()
               throws LoginException

Abstract method to commit the authentication process (phase 2).

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 (checked by retrieving the private state saved by the login method), then this method associates a UnixPrincipal with the Subject located in the LoginModule. If this LoginModule's own 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

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

If this LoginModule's own authentication attempt succeeded (checked by retrieving the private state saved by the login and commit methods), then this method cleans up any state that was originally saved.

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 a user.

This method removes the Principals that were added by the commit method.

Specified by:

logout in interface LoginModule

Returns:

true in all cases since this LoginModule should not be ignored.

Throws:

LoginException - if the logout fails.