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: 1.11 $ $Date: 2003/03/24 23:19:19 $

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