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## org.apache.catalina.authenticator
Class AuthenticatorBase

    java.lang.Object
      |
      +--org.apache.catalina.valves.ValveBase
            |
            +--org.apache.catalina.authenticator.AuthenticatorBase

Direct Known Subclasses:
  BasicAuthenticator, DigestAuthenticator, FormAuthenticator, NonLoginAuthenticator, SSLAuthenticator

public abstract class AuthenticatorBase
extends ValveBase
implements Authenticator, Lifecycle

Basic implementation of the Valve interface that enforces the `<security-constraint>` elements in the web application deployment descriptor. This functionality is implemented as a Valve so that it can be ommitted in environments that do not require these features. Individual implementations of each supported authentication method can subclass this base class as required.

USAGE CONSTRAINT: When this class is utilized, the Context to which it is attached (or a parent Container in a hierarchy) must have an associated Realm that can be used for authenticating users and enumerating the roles to which they have been assigned.

USAGE CONSTRAINT: This Valve is only useful when processing HTTP requests. Requests of any other type will simply be passed through.

Version:
  $Revision: 1.23.2.5 $ $Date: 2002/02/27 17:42:58 $
Author:
  Craig R. McClanahan

Field Summary
`protected java.lang.String` | `algorithm` The message digest algorithm to be used when generating session identifiers.
`protected boolean` | `cache` Should we cache authenticated Principals if the request is part of an HTTP session?
`protected Context` | `context` The Context to which this Valve is attached.
`protected int` | `debug` The debugging detail level for this component.
`protected static java.lang.String` | `DEFAULT_ALGORITHM` The default message digest algorithm to use if we cannot use the requested one.
`protected java.security.MessageDigest` | `digest` Return the MessageDigest implementation to be used when creating session identifiers.
`protected java.lang.String` | `entropy` A String initialization parameter used to increase the entropy of the initialization of our random number generator.
`protected static java.lang.String` | `info` Descriptive information about this implementation.
`protected LifecycleSupport` | `lifecycle` The lifecycle event support for this component.
`protected java.util.Random` | `random` A random number generator to use when generating session identifiers.
`protected java.lang.String` | `randomClass` The Java class name of the random number generator class to be used when generating session identifiers.
`protected static int` | `SESSION_ID_BYTES` The number of random bytes to include when generating a session identifier.
`protected static StringManager` | `sm` The string manager for this package.
`protected SingleSignOn` | `sso` The SingleSignOn implementation in our request processing chain, if there is one.
`protected boolean` | `started` Has this component been started?

Fields inherited from class org.apache.catalina.valves.ValveBase
`container, info, sm`

Fields inherited from interface org.apache.catalina.Lifecycle
`START_EVENT, STOP_EVENT`

Constructor Summary
`AuthenticatorBase()`

Method Summary
`protected boolean` | `accessControl(HttpRequest request, HttpResponse response, SecurityConstraint constraint)` Perform access control based on the specified authorization constraint.
`void` | `addLifecycleListener(LifecycleListener listener)` Add a lifecycle event listener to this component.
`protected void` | `associate(java.lang.String ssoId, Session session)` Associate the specified single sign on identifier with the specified Session.
`protected abstract boolean` | `authenticate(HttpRequest request, HttpResponse response, LoginConfig config)` Authenticate the user making this request, based on the specified login configuration.
`protected boolean` | `checkUserData(HttpRequest request, HttpResponse response, SecurityConstraint constraint)` Enforce any user data constraint required by the security constraint guarding this request URI.
`protected SecurityConstraint` | `findConstraint(HttpRequest request)` Return the SecurityConstraint configured to guard the request URI for this request, or `null` if there is no such constraint.
`protected java.lang.String` | `generateSessionId()` Generate and return a new session identifier for the cookie that identifies an SSO principal.
`java.lang.String` | `getAlgorithm()` Return the message digest algorithm for this Manager.
`boolean` | `getCache()` Return the cache authenticated Principals flag.
`Container` | `getContainer()` Return the Container to which this Valve is attached.
`int` | `getDebug()` Return the debugging detail level for this component.
`protected java.security.MessageDigest` | `getDigest()` Return the MessageDigest object to be used for calculating session identifiers.
`java.lang.String` | `getEntropy()` Return the entropy increaser value, or compute a semi-useful value if this String has not yet been set.
`java.lang.String` | `getInfo()` Return descriptive information about this Valve implementation.
`protected java.util.Random` | `getRandom()` Return the random number generator instance we should use for generating session identifiers.
`java.lang.String` | `getRandomClass()` Return the random number generator class name.
`protected Session` | `getSession(HttpRequest request)` Return the internal Session that is associated with this HttpRequest, or `null` if there is no such Session.
`protected Session` | `getSession(HttpRequest request, boolean create)` Return the internal Session that is associated with this HttpRequest, possibly creating a new one if necessary, or `null` if there is no such session and we did not create one.
`void` | `invoke(Request request, Response response, ValveContext context)` Enforce the security restrictions in the web application deployment descriptor of our associated Context.
`protected void` | `log(java.lang.String message)` Log a message on the Logger associated with our Container (if any).
`protected void` | `log(java.lang.String message, java.lang.Throwable throwable)` Log a message on the Logger associated with our Container (if any).
`protected void` | `register(HttpRequest request, HttpResponse response, java.security.Principal principal, java.lang.String authType, java.lang.String username, java.lang.String password)` Register an authenticated Principal and authentication type in our request, in the current session (if there is one), and with our SingleSignOn valve, if there is one.
`void` | `removeLifecycleListener(LifecycleListener listener)` Remove a lifecycle event listener from this component.
`void` | `setAlgorithm(java.lang.String algorithm)` Set the message digest algorithm for this Manager.
`void` | `setCache(boolean cache)` Set the cache authenticated Principals flag.
`void` | `setContainer(Container container)` Set the Container to which this Valve is attached.
`void` | `setDebug(int debug)` Set the debugging detail level for this component.
`void` | `setEntropy(java.lang.String entropy)` Set the entropy increaser value.
`void` | `setRandomClass(java.lang.String randomClass)` Set the random number generator class name.
`void` | `start()` Prepare for the beginning of active use of the public methods of this component.
`void` | `stop()` Gracefully terminate the active use of the public methods of this component.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_ALGORITHM

    protected static final java.lang.String DEFAULT_ALGORITHM

  The default message digest algorithm to use if we cannot use the requested one.

### SESSION_ID_BYTES

    protected static final int SESSION_ID_BYTES

  The number of random bytes to include when generating a session identifier.

### algorithm

    protected java.lang.String algorithm

  The message digest algorithm to be used when generating session identifiers. This must be an algorithm supported by the `java.security.MessageDigest` class on your platform.

### cache

    protected boolean cache

  Should we cache authenticated Principals if the request is part of an HTTP session?

### context

    protected Context context

  The Context to which this Valve is attached.

### debug

    protected int debug

  The debugging detail level for this component.

### digest

    protected java.security.MessageDigest digest

  Return the MessageDigest implementation to be used when creating session identifiers.

### entropy

    protected java.lang.String entropy

  A String initialization parameter used to increase the entropy of the initialization of our random number generator.

### info

    protected static final java.lang.String info

  Descriptive information about this implementation.

### lifecycle

    protected LifecycleSupport lifecycle

  The lifecycle event support for this component.

### random

    protected java.util.Random random

  A random number generator to use when generating session identifiers.

### randomClass

    protected java.lang.String randomClass

  The Java class name of the random number generator class to be used when generating session identifiers.

### sm

    protected static final StringManager sm

  The string manager for this package.

### sso

    protected SingleSignOn sso

  The SingleSignOn implementation in our request processing chain, if there is one.

### started

    protected boolean started

  Has this component been started?

Constructor Detail

### AuthenticatorBase

    public AuthenticatorBase()

Method Detail

### getAlgorithm

    public java.lang.String getAlgorithm()

  Return the message digest algorithm for this Manager.

### setAlgorithm

    public void setAlgorithm(java.lang.String algorithm)

  Set the message digest algorithm for this Manager.
  Parameters:
    `algorithm` - The new message digest algorithm

### getCache

    public boolean getCache()

  Return the cache authenticated Principals flag.

### setCache

    public void setCache(boolean cache)

  Set the cache authenticated Principals flag.
  Parameters:
    `cache` - The new cache flag

### getContainer

    public Container getContainer()

  Return the Container to which this Valve is attached.
  Overrides:
    getContainer in class ValveBase

### setContainer

    public void setContainer(Container container)

  Set the Container to which this Valve is attached.
  Overrides:
    setContainer in class ValveBase
  Parameters:
    `container` - The container to which we are attached

### getDebug

    public int getDebug()

  Return the debugging detail level for this component.

### setDebug

    public void setDebug(int debug)

  Set the debugging detail level for this component.
  Parameters:
    `debug` - The new debugging detail level

### getEntropy

    public java.lang.String getEntropy()

  Return the entropy increaser value, or compute a semi-useful value if this String has not yet been set.

### setEntropy

    public void setEntropy(java.lang.String entropy)

  Set the entropy increaser value.
  Parameters:
    `entropy` - The new entropy increaser value

### getInfo

    public java.lang.String getInfo()

  Return descriptive information about this Valve implementation.
  Overrides:
    getInfo in class ValveBase

### getRandomClass

    public java.lang.String getRandomClass()

  Return the random number generator class name.

### setRandomClass

    public void setRandomClass(java.lang.String randomClass)

  Set the random number generator class name.
  Parameters:
    `randomClass` - The new random number generator class name

### invoke

    public void invoke(Request request,
                       Response response,
                       ValveContext context)
                throws java.io.IOException,
                       javax.servlet.ServletException

  Enforce the security restrictions in the web application deployment descriptor of our associated Context.
  Overrides:
    invoke in class ValveBase
  Parameters:
    `request` - Request to be processed
    `response` - Response to be processed
    `context` - The valve context used to invoke the next valve in the current processing pipeline
  Throws:
    java.io.IOException - if an input/output error occurs
    javax.servlet.ServletException - if thrown by a processing element

### accessControl

    protected boolean accessControl(HttpRequest request,
                                    HttpResponse response,
                                    SecurityConstraint constraint)
                             throws java.io.IOException

  Perform access control based on the specified authorization constraint. Return `true` if this constraint is satisfied and processing should continue, or `false` otherwise.
  Parameters:
    `request` - Request we are processing
    `response` - Response we are creating
    `constraint` - Security constraint we are enforcing
  Throws:
    java.io.IOException - if an input/output error occurs

### associate

    protected void associate(java.lang.String ssoId,
                             Session session)

  Associate the specified single sign on identifier with the specified Session.
  Parameters:
    `ssoId` - Single sign on identifier
    `session` - Session to be associated

### authenticate

    protected abstract boolean authenticate(HttpRequest request,
                                            HttpResponse response,
                                            LoginConfig config)
                                     throws java.io.IOException

  Authenticate the user making this request, based on the specified login configuration. Return `true` if any specified constraint has been satisfied, or `false` if we have created a response challenge already.
  Parameters:
    `request` - Request we are processing
    `response` - Response we are creating
    `login` - Login configuration describing how authentication should be performed
  Throws:
    java.io.IOException - if an input/output error occurs

### checkUserData

    protected boolean checkUserData(HttpRequest request,
                                    HttpResponse response,
                                    SecurityConstraint constraint)
                             throws java.io.IOException

  Enforce any user data constraint required by the security constraint guarding this request URI. Return `true` if this constraint was not violated and processing should continue, or `false` if we have created a response already.
  Parameters:
    `request` - Request we are processing
    `response` - Response we are creating
    `constraint` - Security constraint being checked
  Throws:
    java.io.IOException - if an input/output error occurs

### findConstraint

    protected SecurityConstraint findConstraint(HttpRequest request)

  Return the SecurityConstraint configured to guard the request URI for this request, or `null` if there is no such constraint.
  Parameters:
    `request` - Request we are processing

### generateSessionId

    protected java.lang.String generateSessionId()

  Generate and return a new session identifier for the cookie that identifies an SSO principal.

### getDigest

    protected java.security.MessageDigest getDigest()

  Return the MessageDigest object to be used for calculating session identifiers. If none has been created yet, initialize one the first time this method is called.

### getRandom

    protected java.util.Random getRandom()

  Return the random number generator instance we should use for generating session identifiers. If there is no such generator currently defined, construct and seed a new one.

### getSession

    protected Session getSession(HttpRequest request)

  Return the internal Session that is associated with this HttpRequest, or `null` if there is no such Session.
  Parameters:
    `request` - The HttpRequest we are processing

### getSession

    protected Session getSession(HttpRequest request,
                                 boolean create)

  Return the internal Session that is associated with this HttpRequest, possibly creating a new one if necessary, or `null` if there is no such session and we did not create one.
  Parameters:
    `request` - The HttpRequest we are processing
    `create` - Should we create a session if needed?

### log

    protected void log(java.lang.String message)

  Log a message on the Logger associated with our Container (if any).
  Parameters:
    `message` - Message to be logged

### log

    protected void log(java.lang.String message,
                       java.lang.Throwable throwable)

  Log a message on the Logger associated with our Container (if any).
  Parameters:
    `message` - Message to be logged
    `throwable` - Associated exception

### register

    protected void register(HttpRequest request,
                            HttpResponse response,
                            java.security.Principal principal,
                            java.lang.String authType,
                            java.lang.String username,
                            java.lang.String password)

  Register an authenticated Principal and authentication type in our request, in the current session (if there is one), and with our SingleSignOn valve, if there is one. Set the appropriate cookie to be returned.
  Parameters:
    `request` - The servlet request we are processing
    `response` - The servlet response we are generating
    `principal` - The authenticated Principal to be registered
    `authType` - The authentication type to be registered
    `username` - Username used to authenticate (if any)
    `password` - Password used to authenticate (if any)

### addLifecycleListener

    public void addLifecycleListener(LifecycleListener listener)

  Add a lifecycle event listener to this component.
  Specified by:
    addLifecycleListener in interface Lifecycle
  Parameters:
    `listener` - The listener to add

### removeLifecycleListener

    public void removeLifecycleListener(LifecycleListener listener)

  Remove a lifecycle event listener from this component.
  Specified by:
    removeLifecycleListener in interface Lifecycle
  Parameters:
    `listener` - The listener to remove

### start

    public void start()
               throws LifecycleException

  Prepare for the beginning of active use of the public methods of this component. This method should be called after `configure()`, and before any of the public methods of the component are utilized.
  Specified by:
    start in interface Lifecycle
  Throws:
    java.lang.IllegalStateException - if this component has already been started
    LifecycleException - if this component detects a fatal error that prevents this component from being used

### stop

    public void stop()
              throws LifecycleException

  Gracefully terminate the active use of the public methods of this component. This method should be the last one called on a given instance of this component.
  Specified by:
    stop in interface Lifecycle
  Throws:
    java.lang.IllegalStateException - if this component has not been started
    LifecycleException - if this component detects a fatal error that needs to be reported

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