org.apache.catalina.realm
Class JAASRealm

java.lang.Object
  org.apache.catalina.realm.RealmBase
      org.apache.catalina.realm.JAASRealm

All Implemented Interfaces:

javax.management.MBeanRegistration, Lifecycle, Realm

public class JAASRealm
extends RealmBase

Implmentation of Realm that authenticates users via the Java Authentication and Authorization Service (JAAS). JAAS support requires either JDK 1.4 (which includes it as part of the standard platform) or JDK 1.3 (with the plug-in jaas.jar file).

The value configured for the appName property is passed to the javax.security.auth.login.LoginContext constructor, to specify the application name used to select the set of relevant LoginModules required.

The JAAS Specification describes the result of a successful login as a javax.security.auth.Subject instance, which can contain zero or more java.security.Principal objects in the return value of the Subject.getPrincipals() method. However, it provides no guidance on how to distinguish Principals that describe the individual user (and are thus appropriate to return as the value of request.getUserPrincipal() in a web application) from the Principal(s) that describe the authorized roles for this user. To maintain as much independence as possible from the underlying LoginMethod implementation executed by JAAS, the following policy is implemented by this Realm:

• The JAAS LoginModule is assumed to return a Subject with at least one Principal instance representing the user himself or herself, and zero or more separate Principals representing the security roles authorized for this user.
• On the Principal representing the user, the Principal name is an appropriate value to return via the Servlet API method HttpServletRequest.getRemoteUser().
• On the Principals representing the security roles, the name is the name of the authorized security role.
• This Realm will be configured with two lists of fully qualified Java class names of classes that implement java.security.Principal - one that identifies class(es) representing a user, and one that identifies class(es) representing a security role.
• As this Realm iterates over the Principals returned by Subject.getPrincipals(), it will identify the first Principal that matches the "user classes" list as the Principal for this user.
• As this Realm iterates over the Princpals returned by Subject.getPrincipals(), it will accumulate the set of all Principals matching the "role classes" list as identifying the security roles for this user.
• It is a configuration error for the JAAS login method to return a validated Subject without a Principal that matches the "user classes" list.
• By default, the enclosing Container's name serves as the application name used to obtain the JAAS LoginContext ("Catalina" in a default installation). Tomcat must be able to find an application with this name in the JAAS configuration file. Here is a hypothetical JAAS configuration file entry for a database-oriented login module that uses a Tomcat-managed JNDI database resource:

  Catalina {
  org.foobar.auth.DatabaseLoginModule REQUIRED
      JNDI_RESOURCE=jdbc/AuthDB
    USER_TABLE=users
    USER_ID_COLUMN=id
    USER_NAME_COLUMN=name
    USER_CREDENTIAL_COLUMN=password
    ROLE_TABLE=roles
    ROLE_NAME_COLUMN=name
    PRINCIPAL_FACTORY=org.foobar.auth.impl.SimplePrincipalFactory;
  };

• To set the JAAS configuration file location, set the CATALINA_OPTS environment variable similar to the following:

  CATALINA_OPTS="-Djava.security.auth.login.config=$CATALINA_HOME/conf/jaas.config"

• As part of the login process, JAASRealm registers its own CallbackHandler, called (unsurprisingly) JAASCallbackHandler. This handler supplies the HTTP requests's username and credentials to the user-supplied LoginModule
• As with other Realm implementations, digested passwords are supported if the <Realm> element in server.xml contains a digest attribute; JAASCallbackHandler will digest the password prior to passing it back to the LoginModule

Author:

Craig R. McClanahan, Yoav Shapira

appName

protected java.lang.String appName

The application name passed to the JAAS LoginContext, which uses it to select the set of relevant LoginModules.

info

protected static final java.lang.String info

Descriptive information about this Realm implementation.

See Also:

Constant Field Values

name

protected static final java.lang.String name

Descriptive information about this Realm implementation.

See Also:

Constant Field Values

roleClasses

protected java.util.List<java.lang.String> roleClasses

The list of role class names, split out for easy processing.

sm

protected static final StringManager sm

The string manager for this package.

userClasses

protected java.util.List<java.lang.String> userClasses

The set of user class names, split out for easy processing.

useContextClassLoader

protected boolean useContextClassLoader

Whether to use context ClassLoader or default ClassLoader. True means use context ClassLoader, and True is the default value.

roleClassNames

protected java.lang.String roleClassNames

Comma-delimited list of java.security.Principal classes that represent security roles.

userClassNames

protected java.lang.String userClassNames

Comma-delimited list of java.security.Principal classes that represent individual users.

JAASRealm

public JAASRealm()

setAppName

public void setAppName(java.lang.String name)

Deprecated. JAAS should use the Engine (domain) name and webpp/host overrides

setter for the appName member variable

getAppName

public java.lang.String getAppName()

getter for the appName member variable

setUseContextClassLoader

public void setUseContextClassLoader(boolean useContext)

Sets whether to use the context or default ClassLoader. True means use context ClassLoader.

Parameters:

useContext - True means use context ClassLoader

isUseContextClassLoader

public boolean isUseContextClassLoader()

Returns whether to use the context or default ClassLoader. True means to use the context ClassLoader.

Returns:

The value of useContextClassLoader

setContainer

public void setContainer(Container container)

Description copied from class: RealmBase

Set the Container with which this Realm has been associated.

Specified by:

setContainer in interface Realm

Overrides:

setContainer in class RealmBase

Parameters:

container - The associated Container

getRoleClassNames

public java.lang.String getRoleClassNames()

setRoleClassNames

public void setRoleClassNames(java.lang.String roleClassNames)

Sets the list of comma-delimited classes that represent roles. The classes in the list must implement java.security.Principal. The supplied list of classes will be parsed when start() is called.

parseClassNames

protected void parseClassNames(java.lang.String classNamesString,
                               java.util.List<java.lang.String> classNamesList)

Parses a comma-delimited list of class names, and store the class names in the provided List. Each class must implement java.security.Principal.

Parameters:

classNamesString - a comma-delimited list of fully qualified class names.

classNamesList - the list in which the class names will be stored. The list is cleared before being populated.

getUserClassNames

public java.lang.String getUserClassNames()

setUserClassNames

public void setUserClassNames(java.lang.String userClassNames)

Sets the list of comma-delimited classes that represent individual users. The classes in the list must implement java.security.Principal. The supplied list of classes will be parsed when start() is called.

getInfo

public java.lang.String getInfo()

Return descriptive information about this Realm implementation and the corresponding version number, in the format <description>/<version>.

Specified by:

getInfo in interface Realm

Overrides:

getInfo in class RealmBase

authenticate

public java.security.Principal authenticate(java.lang.String username,
                                            java.lang.String credentials)

Return the Principal associated with the specified username and credentials, if there is one; otherwise return null.

Specified by:

authenticate in interface Realm

Overrides:

authenticate in class RealmBase

Parameters:

username - Username of the Principal to look up

credentials - Password or other credentials to use in authenticating this username

authenticate

public java.security.Principal authenticate(java.lang.String username,
                                            java.lang.String clientDigest,
                                            java.lang.String nonce,
                                            java.lang.String nc,
                                            java.lang.String cnonce,
                                            java.lang.String qop,
                                            java.lang.String realmName,
                                            java.lang.String md5a2)

Return the Principal associated with the specified username and digest, if there is one; otherwise return null.

Specified by:

authenticate in interface Realm

Overrides:

authenticate in class RealmBase

Parameters:

username - Username of the Principal to look up

clientDigest - Digest to use in authenticating this username

nonce - Server generated nonce

nc - Nonce count

cnonce - Client generated nonce

qop - Quality of protection aplied to the message

realmName - Realm name

md5a2 - Second MD5 digest used to calculate the digest MD5(Method + ":" + uri)

authenticate

protected java.security.Principal authenticate(java.lang.String username,
                                               javax.security.auth.callback.CallbackHandler callbackHandler)

Perform the actual JAAS authentication

getName

protected java.lang.String getName()

Return a short name for this Realm implementation.

Specified by:

getName in class RealmBase

getPassword

protected java.lang.String getPassword(java.lang.String username)

Return the password associated with the given principal's user name. This always returns null as the JAASRealm has no way of obtaining this information.

Specified by:

getPassword in class RealmBase

getPrincipal

protected java.security.Principal getPrincipal(java.lang.String username)

Return the Principal associated with the given user name.

Specified by:

getPrincipal in class RealmBase

createPrincipal

protected java.security.Principal createPrincipal(java.lang.String username,
                                                  javax.security.auth.Subject subject)

Deprecated. Use createPrincipal(String, Subject, LoginContext)

createPrincipal

protected java.security.Principal createPrincipal(java.lang.String username,
                                                  javax.security.auth.Subject subject,
                                                  javax.security.auth.login.LoginContext loginContext)

Identify and return a java.security.Principal instance representing the authenticated user for the specified Subject. The Principal is constructed by scanning the list of Principals returned by the JAASLoginModule. The first Principal object that matches one of the class names supplied as a "user class" is the user Principal. This object is returned to the caller. Any remaining principal objects returned by the LoginModules are mapped to roles, but only if their respective classes match one of the "role class" classes. If a user Principal cannot be constructed, return null.

Parameters:

subject - The Subject representing the logged-in user

loginContext - Associated with the Principal so LoginContext.logout() can be called later

makeLegalForJAAS

protected java.lang.String makeLegalForJAAS(java.lang.String src)

Ensure the given name is legal for JAAS configuration. Added for Bugzilla 30869, made protected for easy customization in case my implementation is insufficient, which I think is very likely.

Parameters:

src - The name to validate

Returns:

A string that's a valid JAAS realm name

start

public void start()
           throws LifecycleException

Prepare for active use of the public methods of this Component.

Specified by:

start in interface Lifecycle

Overrides:

start in class RealmBase

Throws:

LifecycleException - if this component detects a fatal error that prevents it from being started

stop

public void stop()
          throws LifecycleException

Gracefully shut down active use of the public methods of this Component.

Specified by:

stop in interface Lifecycle

Overrides:

stop in class RealmBase

Throws:

LifecycleException - if this component detects a fatal error that needs to be reported