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## org.apache.catalina.authenticator
Class DigestAuthenticator

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

All Implemented Interfaces:
  Authenticator, Contained, Lifecycle, Valve

public class DigestAuthenticator
extends AuthenticatorBase

An Authenticator and Valve implementation of HTTP DIGEST Authentication (see RFC 2069).

Version:
  $Revision: 1.10 $ $Date: 2001/10/19 16:23:57 $
Author:
  Craig R. McClanahan, Remy Maucherat

Field Summary
`protected static java.lang.String` | `info` Descriptive information about this implementation.
`protected java.lang.String` | `key` Private key.
`protected static MD5Encoder` | `md5Encoder` The MD5 helper object for this class.
`protected static java.security.MessageDigest` | `md5Helper` MD5 message digest provider.
`protected long` | `nOnceTimeout` No once expiration (in millisecond).
`protected java.util.Hashtable` | `nOnceTokens` No once hashtable.
`protected int` | `nOnceUses` No once expiration after a specified number of uses.
`protected static int` | `TIMEOUT_INFINITE` Indicates that no once tokens are used only once.
`protected static int` | `USE_NEVER_EXPIRES` Indicates that no once tokens are used only once.
`protected static int` | `USE_ONCE` Indicates that no once tokens are used only once.

Fields inherited from class org.apache.catalina.authenticator.AuthenticatorBase
`algorithm, cache, context, debug, DEFAULT_ALGORITHM, digest, disableProxyCaching, entropy, lifecycle, random, randomClass, SESSION_ID_BYTES, sm, sso, started`

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

Fields inherited from interface org.apache.catalina.Lifecycle
`AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, START_EVENT, STOP_EVENT`

Constructor Summary
`DigestAuthenticator()`

Method Summary
`boolean` | `authenticate(HttpRequest request, HttpResponse response, LoginConfig config)` Authenticate the user making this request, based on the specified login configuration.
`protected static java.security.Principal` | `findPrincipal(javax.servlet.http.HttpServletRequest request, java.lang.String authorization, Realm realm)` Parse the specified authorization credentials, and return the associated Principal that these credentials authenticate (if any) from the specified Realm.
`protected java.lang.String` | `generateNOnce(javax.servlet.http.HttpServletRequest request)` Generate a unique token.
`java.lang.String` | `getInfo()` Return descriptive information about this Valve implementation.
`protected java.lang.String` | `parseUsername(java.lang.String authorization)` Parse the username from the specified authorization string.
`protected static java.lang.String` | `removeQuotes(java.lang.String quotedString)` Removes the quotes on a string.
`protected void` | `setAuthenticateHeader(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, LoginConfig config, java.lang.String nOnce)` Generates the WWW-Authenticate header.

Methods inherited from class org.apache.catalina.authenticator.AuthenticatorBase
`accessControl, addLifecycleListener, associate, checkUserData, findConstraint, findLifecycleListeners, generateSessionId, getAlgorithm, getCache, getContainer, getDebug, getDigest, getDisableProxyCaching, getEntropy, getRandom, getRandomClass, getSession, getSession, invoke, log, log, register, removeLifecycleListener, setAlgorithm, setCache, setContainer, setDebug, setDisableProxyCaching, setEntropy, setRandomClass, start, stop`

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

Field Detail

### USE_ONCE

    protected static final int USE_ONCE

  Indicates that no once tokens are used only once.

  See Also:
    Constant Field Values

### USE_NEVER_EXPIRES

    protected static final int USE_NEVER_EXPIRES

  Indicates that no once tokens are used only once.

  See Also:
    Constant Field Values

### TIMEOUT_INFINITE

    protected static final int TIMEOUT_INFINITE

  Indicates that no once tokens are used only once.

  See Also:
    Constant Field Values

### md5Encoder

    protected static final MD5Encoder md5Encoder

  The MD5 helper object for this class.

### info

    protected static final java.lang.String info

  Descriptive information about this implementation.

  See Also:
    Constant Field Values

### md5Helper

    protected static java.security.MessageDigest md5Helper

  MD5 message digest provider.

### nOnceTokens

    protected java.util.Hashtable nOnceTokens

  No once hashtable.

### nOnceTimeout

    protected long nOnceTimeout

  No once expiration (in millisecond). A shorter amount would mean a better security level (since the token is generated more often), but at the expense of a bigger server overhead.

### nOnceUses

    protected int nOnceUses

  No once expiration after a specified number of uses. A lower number would produce more overhead, since a token would have to be generated more often, but would be more secure.

### key

    protected java.lang.String key

  Private key.

Constructor Detail

### DigestAuthenticator

    public DigestAuthenticator()

Method Detail

### getInfo

    public java.lang.String getInfo()

  Return descriptive information about this Valve implementation.

  Specified by:
    `getInfo` in interface `Valve`
  Overrides:
    `getInfo` in class `AuthenticatorBase`

### authenticate

    public 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.

  Specified by:
    `authenticate` in class `AuthenticatorBase`
  Parameters:
    `request` - Request we are processing
    `response` - Response we are creating
  Throws:
    `java.io.IOException` - if an input/output error occurs

### findPrincipal

    protected static java.security.Principal findPrincipal(javax.servlet.http.HttpServletRequest request,
                                                           java.lang.String authorization,
                                                           Realm realm)

  Parse the specified authorization credentials, and return the associated Principal that these credentials authenticate (if any) from the specified Realm. If there is no such Principal, return `null`.

  Parameters:
    `request` - HTTP servlet request
    `authorization` - Authorization credentials from this request
    `realm` - Realm used to authenticate Principals

### parseUsername

    protected java.lang.String parseUsername(java.lang.String authorization)

  Parse the username from the specified authorization string. If none can be identified, return `null`

  Parameters:
    `authorization` - Authorization string to be parsed

### removeQuotes

    protected static java.lang.String removeQuotes(java.lang.String quotedString)

  Removes the quotes on a string.

### generateNOnce

    protected java.lang.String generateNOnce(javax.servlet.http.HttpServletRequest request)

  Generate a unique token. The token is generated according to the following pattern. NOnceToken = Base64 ( MD5 ( client-IP ":" time-stamp ":" private-key ) ).

  Parameters:
    `request` - HTTP Servlet request

### setAuthenticateHeader

    protected void setAuthenticateHeader(javax.servlet.http.HttpServletRequest request,
                                         javax.servlet.http.HttpServletResponse response,
                                         LoginConfig config,
                                         java.lang.String nOnce)

  Generates the WWW-Authenticate header.

  The header MUST follow this template :

            WWW-Authenticate    = "WWW-Authenticate" ":" "Digest"
                                  digest-challenge

            digest-challenge    = 1#( realm | [ domain ] | nOnce |
                        [ digest-opaque ] |[ stale ] | [ algorithm ] )

            realm               = "realm" "=" realm-value
            realm-value         = quoted-string
            domain              = "domain" "=" <"> 1#URI <">
            nonce               = "nonce" "=" nonce-value
            nonce-value         = quoted-string
            opaque              = "opaque" "=" quoted-string
            stale               = "stale" "=" ( "true" | "false" )
            algorithm           = "algorithm" "=" ( "MD5" | token )

  Parameters:
    `request` - HTTP Servlet request
    `nOnce` - nonce token

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