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## org.apache.catalina.realm
Class JAASCallbackHandler

    java.lang.Object
      org.apache.catalina.realm.JAASCallbackHandler

All Implemented Interfaces:
  javax.security.auth.callback.CallbackHandler

    public class JAASCallbackHandler

extends java.lang.Object
implements javax.security.auth.callback.CallbackHandler

Implementation of the JAAS `CallbackHandler` interface, used to negotiate delivery of the username and credentials that were specified to our constructor. No interaction with the user is required (or possible).

This `CallbackHandler` will pre-digest the supplied password, if required by the `<Realm>` element in `server.xml`.

At present, `JAASCallbackHandler` knows how to handle callbacks of type `javax.security.auth.callback.NameCallback` and `javax.security.auth.callback.PasswordCallback`.

Author:
  Craig R. McClanahan, Andrew R. Jaquith

Field Summary
`protected java.lang.String` | `authMethod` The authentication method to be used.
`protected java.lang.String` | `cnonce` Client generated nonce.
`protected java.lang.String` | `md5a2` Second MD5 digest.
`protected java.lang.String` | `nc` Nonce count.
`protected java.lang.String` | `nonce` Server generated nonce.
`protected java.lang.String` | `password` The password to be authenticated with.
`protected java.lang.String` | `qop` Quality of protection aplied to the message.
`protected JAASRealm` | `realm` The associated `JAASRealm` instance.
`protected java.lang.String` | `realmName` Realm name.
`protected static StringManager` | `sm` The string manager for this package.
`protected java.lang.String` | `username` The username to be authenticated with.

Constructor Summary
`JAASCallbackHandler(JAASRealm realm, java.lang.String username, java.lang.String password)` Construct a callback handler configured with the specified values.
`JAASCallbackHandler(JAASRealm realm, java.lang.String username, java.lang.String password, java.lang.String nonce, java.lang.String nc, java.lang.String cnonce, java.lang.String qop, java.lang.String realmName, java.lang.String md5a2, java.lang.String authMethod)` Construct a callback handler for DIGEST authentication.

Method Summary
`void` | `handle(javax.security.auth.callback.Callback[] callbacks)` Retrieve the information requested in the provided `Callbacks`.

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

Field Detail

### sm

    protected static final StringManager sm

  The string manager for this package.

### password

    protected java.lang.String password

  The password to be authenticated with.

### realm

    protected JAASRealm realm

  The associated `JAASRealm` instance.

### username

    protected java.lang.String username

  The username to be authenticated with.

### nonce

    protected java.lang.String nonce

  Server generated nonce.

### nc

    protected java.lang.String nc

  Nonce count.

### cnonce

    protected java.lang.String cnonce

  Client generated nonce.

### qop

    protected java.lang.String qop

  Quality of protection aplied to the message.

### realmName

    protected java.lang.String realmName

  Realm name.

### md5a2

    protected java.lang.String md5a2

  Second MD5 digest.

### authMethod

    protected java.lang.String authMethod

  The authentication method to be used. If null, assume BASIC/FORM.

Constructor Detail

### JAASCallbackHandler

    public JAASCallbackHandler(JAASRealm realm,
                               java.lang.String username,
                               java.lang.String password)

  Construct a callback handler configured with the specified values. Note that if the `JAASRealm` instance specifies digested passwords, the `password` parameter will be pre-digested here.

  Parameters:
    `realm` - Our associated JAASRealm instance
    `username` - Username to be authenticated with
    `password` - Password to be authenticated with

### JAASCallbackHandler

    public JAASCallbackHandler(JAASRealm realm,
                               java.lang.String username,
                               java.lang.String password,
                               java.lang.String nonce,
                               java.lang.String nc,
                               java.lang.String cnonce,
                               java.lang.String qop,
                               java.lang.String realmName,
                               java.lang.String md5a2,
                               java.lang.String authMethod)

  Construct a callback handler for DIGEST authentication.

  Parameters:
    `realm` - Our associated JAASRealm instance
    `username` - Username to be authenticated with
    `password` - Password to be authenticated with
    `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)
    `authMethod` - The authentication method in use

Method Detail

### handle

    public void handle(javax.security.auth.callback.Callback[] callbacks)
                throws java.io.IOException,
                       javax.security.auth.callback.UnsupportedCallbackException

  Retrieve the information requested in the provided `Callbacks`. This implementation only recognizes `NameCallback`, `PasswordCallback` and `TextInputCallback`. `TextInputCallback` is ued to pass the various additional parameters required for DIGEST authentication.

  Specified by:
    `handle` in interface `javax.security.auth.callback.CallbackHandler`
  Parameters:
    `callbacks` - The set of `Callback`s to be processed
  Throws:
    `java.io.IOException` - if an input/output error occurs
    `javax.security.auth.callback.UnsupportedCallbackException` - if the login method requests an unsupported callback type

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