Wiki source code of User Authentication

Version 51.1 by Thomas Mortagne on 2012/05/10

version	line-number	content
1.18	1	XWiki supports several different authentication mechanisms for authenticating users:
1.1	2
34.2	3	{{toc/}}
34.1	4
1.1	5	The form authentication is the default mechanism.
	6
34.1	7	{{info}}
	8	Note that currently XWiki allows only one method of authentication to be enabled at a time. This will probably be improved in the future.
	9	{{/info}}
1.1	10
34.2	11	= Form Authentication =
1.1	12
38.2	13	Form authentication is the default way to get authenticated within a Wiki. It requires a user and a password.
1.1	14
46.1	15	= Basic Authentication =
	16
	17	XWiki supports [basic access authentication>http://en.wikipedia.org/wiki/Basic_access_authentication], a method designed to allow a Web browser, or other client program, to provide credentials - in the form of a user name and password - when making a request. You can get authenticated against an XWiki server with the basic authentication protocol using the following URL scheme:
	18
	19	{{code}}
	20	http://username:password@mywiki.xwiki.com/xwiki/bin/view/Main/WebHome?basicauth=1
	21	{{/code}}
	22
	23	{{warning}}
	24	Be careful that if you use the ##HTTP## protocol your password will be sent in clear over the network and is thus very unsafe. When using Basic Authentication you should make sure your wiki is configured to use ##HTTPS##.
	25	{{/warning}}
	26
34.2	27	= LDAP Authentication =
1.1	28
34.1	29	{{warning}}
	30	New LDAP implementation since XWiki Platform 1.3M2, see [[previous LDAP authentication service documentation>>AuthenticationLdapOld]]
	31	{{/warning}}
17.3	32
34.2	33	== Generic LDAP configuration ==
1.1	34
34.1	35	In order to enable the LDAP support you have to change the authentication method in //WEB-INF/xwiki.cfg// as follows:
	36
	37	{{code}}
50.1	38	#-# LDAP authentication service
	39	# xwiki.authentication.authclass=com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl
7.1	40
50.1	41	#-# Turn LDAP authentication on - otherwise only XWiki authentication
	42	#-# - 0: disable
	43	#-# - 1: enable
	44	#-# The default is 1
	45	# xwiki.authentication.ldap=1
34.1	46	{{/code}}
18.1	47
34.1	48	You can setup the LDAP configuration in the //xwiki.cfg// file by filling the following properties:
1.2	49
34.1	50	{{code language="none"}}
36.1	51	#-# LDAP Server (Active Directory, eDirectory, OpenLDAP, etc.)
	52	xwiki.authentication.ldap.server=127.0.0.1
1.1	53	xwiki.authentication.ldap.port=389
6.1	54
36.1	55	#-# LDAP login, empty = anonymous access, otherwise specify full dn
50.1	56	#-# {0} is replaced with the user name, {1} with the password
1.1	57	xwiki.authentication.ldap.bind_DN=cn={0},department=USER,department=INFORMATIK,department=1230,o=MP
	58	xwiki.authentication.ldap.bind_pass={1}
6.1	59
50.1	60	#-# The Base DN used in LDAP searches
	61	xwiki.authentication.ldap.base_DN=
12.1	62
50.1	63	#-# LDAP query to search the user in the LDAP database (in case a static admin user is provided in
	64	#-# xwiki.authentication.ldap.bind_DN)
	65	#-# {0} is replaced with the user uid field name and {1} with the user name
	66	#-# The default is ({0}={1})
	67	# xwiki.authentication.ldap.ldap_user_search_fmt=({0}={1})
	68
	69	#-# Only members of the following group will be verified in the LDAP
36.1	70	#-# otherwise only users that are found after searching starting from the base_DN
	71	# xwiki.authentication.ldap.user_group=cn=developers,ou=groups,o=MegaNova,c=US
6.1	72
50.1	73	#-# [Since 1.5RC1, XWikiLDAPAuthServiceImpl]
	74	#-# Only users not member of the following group can autheticate
36.1	75	# xwiki.authentication.ldap.exclude_group=cn=admin,ou=groups,o=MegaNova,c=US
22.1	76
50.1	77	#-# Specifies the LDAP attribute containing the identifier to be used as the XWiki name
	78	#-# The default is cn
36.1	79	# xwiki.authentication.ldap.UID_attr=cn
6.1	80
50.1	81	#-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
36.1	82	#-# The potential LDAP groups classes. Separated by commas.
	83	# xwiki.authentication.ldap.group_classes=group,groupOfNames,groupOfUniqueNames,dynamicGroup,dynamicGroupAux,groupWiseDistributionList
	84
50.1	85	#-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
36.1	86	#-# The potential names of the LDAP groups fields containings the members. Separated by commas.
	87	# xwiki.authentication.ldap.group_memberfields=member,uniqueMember
	88
	89	#-# retrieve the following fields from LDAP and store them in the XWiki user object (xwiki-attribute=ldap-attribute)
	90	xwiki.authentication.ldap.fields_mapping=last_name=sn,first_name=givenName,email=mail
	91
50.1	92	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
	93	#-# On every login update the mapped attributes from LDAP to XWiki otherwise this happens only once when the XWiki
	94	#-# account is created.
	95	#-# - 0: only when creating user
	96	#-# - 1: at each authentication
	97	#-# The default is 1
	98	# xwiki.authentication.ldap.update_user=1
6.1	99
50.1	100	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
	101	#-# Maps XWiki groups to LDAP groups, separator is "\|". The following kind of groups are supported:
	102	#-# * LDAP static groups (users/subgroups are listed statically in the group object)
	103	#-# * [Since 3.3M1] LDAP organization units (users/subgroups are sub object of the provided organization unit)
	104	#-# * [Since 3.3M1] LDAP filter (users/groups are object found in a search with the provided filter),
	105	#-# \| character in the filter need to be escaped with backslash (\).
	106	#-#
	107	#-# Here is an example:
	108	# xwiki.authentication.ldap.group_mapping=XWiki.XWikiAdminGroup=cn=AdminRole,ou=groups,o=domain,c=com\|\
	109	# XWiki.LDAPUsers=ou=groups,o=domain,c=com\|\
	110	# XWiki.Organisation=(cn=testers)
6.1	111
50.1	112	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
	113	#-# Time in s after which the list of members in a group is refreshed from LDAP
	114	#-# The default is 21600 (6 hours)
	115	# xwiki.authentication.ldap.groupcache_expiration=21600
6.1	116
50.1	117	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
36.1	118	#-# - create : synchronize group membership only when the user is first created
	119	#-# - always: synchronize on every login
50.1	120	#-# The default is always
36.1	121	# xwiki.authentication.ldap.mode_group_sync=always
6.1	122
50.1	123	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
36.1	124	#-# if ldap authentication fails for any reason, try XWiki DB authentication with the same credentials
50.1	125	#-# The default is 1
6.1	126	xwiki.authentication.ldap.trylocal=1
8.1	127
50.1	128	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
36.1	129	#-# SSL connection to LDAP server
50.1	130	#-# - 0: normal
	131	#-# - 1: SSL
	132	#-# The default is 0
36.1	133	# xwiki.authentication.ldap.ssl=0
8.1	134
50.1	135	#-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
36.1	136	#-# The keystore file to use in SSL connection
	137	# xwiki.authentication.ldap.ssl.keystore=
	138
50.1	139	#-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
36.1	140	#-# The java secure provider used in SSL connection
50.1	141	#-# The default is com.sun.net.ssl.internal.ssl.Provider
36.1	142	# xwiki.authentication.ldap.ssl.secure_provider=com.sun.net.ssl.internal.ssl.Provider
50.1	143
	144	#-# Bypass standard LDAP bind validation by doing a direct password comparison.
	145	#-# If you don't know what you do, don't use that. It's covering very rare and bad use cases.
	146	#-# - 0: disable
	147	#-# - 1: enable
	148	#-# The default is 0
	149	# xwiki.authentication.ldap.validate_password=0
	150
	151	#-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
	152	#-# Specifies the LDAP attribute containing the password to be used "when xwiki.authentication.ldap.validate_password"
	153	#-# is set to 1
	154	# xwiki.authentication.ldap.password_field=userPassword
34.1	155	{{/code}}
3.1	156
34.1	157	{{info}}
48.1	158	You can also setup the LDAP configuration in XWiki.XWikiPreferences page by going to the object editor. Simply replace "xwiki.authentication.ldap." by "ldap_". For example ##xwiki.authentication.ldap.base_DN## becomes ##ldap_base_DN##.
34.1	159	{{/info}}
9.1	160
1.19	161	For testing purposes, you may wish to omit the "ldap.fields_mapping" field, to test the authentication first, and then add it later to get the mappings right.
	162
31.1	163	Here are some LDAP client for checking your configuration:
1.19	164
34.1	165	* [[Apache Directory Studio>>http://directory.apache.org/studio/]]
37.1	166	* [[LDAPExplorerTool>>http://ldaptool.sourceforge.net/]]
51.1	167	* [[JXplorer>>http://jxplorer.org]]
1.19	168
34.2	169	== Detailed use cases ==
12.1	170
34.1	171	See [[LDAP configuration uses cases>>LDAPAuthenticationUseCases]] for some detailed use cases.
25.1	172
34.2	173	== Enable LDAP debug log ==
34.1	174
42.1	175	See [[AdminGuide.Logging]].
34.1	176
45.1	177	The specific packages to track for LDAP are ##com.xpn.xwiki.plugin.ldap## and ##com.xpn.xwiki.user.impl.LDAP##.
27.1	178
49.1	179	In XWiki 3.4 you need to add the following in ##WEB-INF/classes/logback.xml##:
	180
	181	{{code}}
	182	<!-- LDAP debugging -->
	183	<logger name="com.xpn.xwiki.plugin.ldap" level="trace"/>
	184	<logger name="com.xpn.xwiki.user.impl.LDAP" level="trace"/>
	185	{{/code}}
	186
42.1	187	Before 3.1, add the following to the log4j configuration file:
	188
44.1	189	{{code}}
	190	log4j.logger.com.xpn.xwiki.plugin.ldap=trace
	191	log4j.logger.com.xpn.xwiki.user.impl.LDAP=trace
	192	{{/code}}
	193
34.2	194	= eXo Authentication =
30.1	195
34.1	196	The eXo authentication is used automatically by adding/editing the //xwiki.exo=1// property in //WEB-INF/xwiki.cfg//.
1.1	197
34.2	198	= Custom Authentication =
1.1	199
	200	This allows plugging to any existing authentication mechanism such as SiteMinder, etc. To configure a custom authentication do the following:
	201
47.2	202	1. Implement the {{scm path="xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/user/api/XWikiAuthService.java"}}XWikiAuthService{{/scm}} interface.
34.1	203	1. Edit the //WEB-INF/xwiki.cfg// file and add a //xwiki.authentication.authclass// property pointing to your class. For example:
	204
	205	{{code}}
1.1	206	xwiki.authentication.authclass = com.acme.MyCustomAuthenticationService
34.1	207	{{/code}}
1.1	208
34.1	209	Here's a [[tutorial on implementing a custom authentication class for authenticating against Oracle's SSO>>http://bodez.wordpress.com/2008/10/15/xwiki-user-authentication-with-oracle-sso/]].
27.2	210
47.2	211	Note, that you also can implement own right management service by implementing {{scm path="xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/user/api/XWikiRightService.java"}}XWikiRightService{{/scm}} interface:
34.1	212
	213	{{code}}
5.1	214	xwiki.authentication.rightsclass = com.acme.MyCustomRightsService
34.1	215	{{/code}}
4.1	216
47.2	217	and Group Service by implementing {{scm path="xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/user/api/XWikiGroupService.java"}}XWikiGroupService{{/scm}}:
4.1	218
34.1	219	{{code}}
27.3	220	xwiki.authentication.groupclass = com.acme.MyCustomGroupService
34.1	221	{{/code}}
4.1	222
34.2	223	== Custom Authentication using a Groovy script in a wiki page ==
28.1	224
	225	Start by specifying you want to use the Groovy Authenticator:
	226
34.1	227	{{code}}
28.1	228	xwiki.authentication.authclass = com.xpn.xwiki.user.impl.xwiki.GroovyAuthServiceImpl
34.1	229	{{/code}}
28.1	230
	231	Then add another configuration parameter to specify in which wiki page the authenticator is:
	232
34.1	233	{{code}}
28.1	234	xwiki.authentication.groovy.pagename = MySpace.MyPage
34.1	235	{{/code}}
28.1	236
	237	Then in a wiki page put some Groovy code that returns a XWikiAuthService object.
	238
37.1	239	= Authentication parameters =
1.14	240
	241	You can set each of these parameters by setting:
	242
34.1	243	{{code}}
1.14	244	xwiki.authentication.~~param_name~~=~~param_value~~
34.1	245	{{/code}}
1.14	246
34.1	247	\|=Name\|=Optional\|=Allowed values\|=Default value\|=Description
	248	\|encryptionKey\|No(1)\|?\|n/a\|Set the Encryption Key used to create a secret key, the secret key is passed to the Cipher object to be used during encryption and decryption of cookie values.
	249	\|validationKey\|No(2)\|?\|n/a\|Set the Validation Key used to generate hash value; the hash value is stored with the cookie and used to verify that the cookie has not been tampered with.
	250	\|cookiedomains\|Yes\|String\|Server host name\|Which host(s) should your cookies be sent to; use only if you want to share cookies across domains, otherwise should be commented out
	251	\|cookielife\|Yes\|Number\|14\|Number of days cookies take to expire
	252	\|cookiepath\|Yes\|String\|/\|The webapp path that XWiki cookies should be sent to; if you have anything else running on your web server, this should be set to ///xwiki//
	253	\|default_page\|Yes\|String\|/bin/view/ Main/WebHome\|Page to redirect to if xredirect parameter is not set
	254	\|encryptionalgorithm\|Yes\|?\|?\|Set the Encryption Algorithm used to encrypt and decrypt cookies
	255	\|encryptionmode\|Yes\|?\|?\|Set the Encryption Mode used to encrypt and decrypt cookies
	256	\|encryptionpadding\|Yes\|?\|?\|Set the Encryption Padding used to encrypt and decrypt cookies
	257	\|errorpage\|Yes\|String\|/bin/loginerror/ XWiki/XWikiLogin\|Page to redirect to if there is an error logging in
	258	\|loginpage\|Yes\|String\|/bin/login/ XWiki/XWikiLogin\|Page to redirect to when not logged in
35.1	259	\|loginsubmitpage\|Yes\|String\|/loginsubmit/ XWiki/XWikiLogin\|The URL where the username and password are posted to when logging in.
34.1	260	\|logoutpage\|Yes\|String\|/bin/logout/ XWiki/XWikiLogout\|Page to redirect to after logged out
	261	\|realmname\|Yes\|String\|XWiki\|Sets the realm name
	262	\|protection\|Yes\|all, validation, encryption, none\|all\|Protection level for the "remember me" cookie functionality
35.1	263	\|unauthorized_code\|Yes\|Number\|401\|The HTTP status code to return when the login has failed.
34.1	264	\|useip\|Yes\|true / false\|true\|Specify to use the IP address when encrypting the cookie data; if IP address changes will need to re-login.
1.16	265
34.1	266	1. Only required if protection = encryption or all (default)
	267	1. Only required if protection = validation or all (default)
1.17	268
34.2	269	= Kerberos SSO Authentication =
21.1	270
34.1	271	{{warning}}
	272	This implementation of SSO is currently under review see: http://jira.xwiki.org/jira/browse/XWIKI-2496 . The class which is described in this segment of documentation, AppServerTrustedKerberosAuthServiceImpl, is not part of the default XWiki distribution!
	273	{{/warning}}
	274
20.1	275	The following is an example of mod_auth_kerb for Apache being used to easily implement Xwiki authentication of users via by HTTP Negotiate on a linux server. This example assumes you already have a working Apache2 HTTPD and Apache Tomcat setup with mod_jk.
1.18	276
20.1	277	First of all you need to create a principal and keytab for the webserver:
34.1	278
	279	{{code}}
20.1	280	# kadmin
	281	kadmin> addprinc -randkey HTTP/wiki.example.com
	282	kadmin> ktadd -k /etc/apache2/ssl/wiki.keytab HTTP/wiki.example.com
	283	kadmin> quit
34.1	284	{{/code}}
10.1	285
20.1	286	Make sure the keytab has the right permissions and ownership:
34.1	287
	288	{{code}}
20.1	289	chown www-data:www-data /etc/apache2/ssl/wiki.keytab
	290	chmod 400 /etc/apache2/ssl/wiki.keytab
34.1	291	{{/code}}
11.1	292
20.1	293	Install mod_auth_kerb in your linux installation. On Debian or Ubuntu this would be achieved by running:
34.1	294
	295	{{code}}
20.1	296	aptitude install libapache2-mod-auth-kerb
34.1	297	{{/code}}
	298
20.1	299	Of course the installation procedure varies per Linux distribution.
	300
	301	If your xwiki installation is mounted in Apache HTTPD under /xwiki, add the following to the virtual host configuration:
34.1	302
	303	{{code}}
20.1	304	<Location /xwiki/>
	305	AuthType Kerberos
	306	AuthName "Kerberos Login"
	307	KrbAuthRealms EXAMPLE.COM
	308	Krb5Keytab "/etc/apache2/ssl/wiki.keytab"
	309	KrbMethodK5Passwd off
	310	KrbMethodNegotiate on
	311	KrbSaveCredentials on
	312	require valid-user
	313	</Location>
34.1	314	{{/code}}
20.1	315
	316	Make sure Apache Tomcat uses the authentication performed by Apache HTTPD with the "tomcatAuthentication" property in the connector description (which is in the server.xml file of Apache Tomcat):
34.1	317
	318	{{code}}
20.1	319	<Connector port="8009" address="127.0.0.1" enableLookups="false" tomcatAuthentication="false" redirectPort="8443" protocol="AJP/1.3" />
34.1	320	{{/code}}
20.1	321
	322	Place the authkerb.jar jar in the WEB-INF/lib directory of Xwiki in Apache Tomcat.
	323
	324	Have Xwiki use the authentication module by changing the "xwiki.authentication.authclass" property in WEB-INF/lib/xwiki.cfg file.
34.1	325
	326	{{code}}
20.1	327	xwiki.authentication.authclass=com.xpn.xwiki.user.impl.xwiki.AppServerTrustedKerberosAuthServiceImpl
34.1	328	{{/code}}
20.1	329
34.1	330	If you use Firefox, do not forget to whitelist the xwiki URL for HTTP Negotiate in about:config with the "network.negotiate-auth.trusted-uris" property. possible values for this propperty include (without the quotes): "https:~/~/" for all secured connections or "example.com" for all example.com subdomains.
20.1	331
34.1	332	2 JBoss SPNEGO (Kerberos in combination with LDAP) I changed the code of the XWikiLDAPAuthServiceImpl to be able to detect the sso user. The authenication already happend by using the SPNEGO module (JAAS). After that I'm using the ldap synchronisation feature to make sure that the user is up to date. The combination leads to an automatic login in the xwiki and the user rights are controlled in the Active Directory server. I hope you can adopt this code or that you can use it for your own projects.
29.1	333
34.2	334	The configuration of ldap:
29.1	335
34.1	336	{{code}}
29.1	337	xwiki.authentication.authclass=com.wiki.sso.SSOLdapAuthenicationImpl
	338	xwiki.authentication.ldap=1
	339	xwiki.authentication.ldap.server=<ad-server>
	340	xwiki.authentication.ldap.port=389
	341	xwiki.authentication.ldap.base_DN=<OU=Users,...............>
	342	#use a fixed user to attach to the ldap database,
	343	#the password is not provided with the SSOLdapAuthenicationImpl
	344	xwiki.authentication.ldap.bind_DN=<domain>\\<user>
	345	xwiki.authentication.ldap.bind_pass=<password>
	346	#Microsoft AD configuration
	347	xwiki.authentication.ldap.UID_attr=sAMAccountName
	348	xwiki.authentication.ldap.fields_mapping=name=sAMAccountName,last_name=sn,first_name=givenName,fullname=displayName,mail=mail,ldap_dn=dn
	349	xwiki.authentication.ldap.group_memberfields=member,uniqueMember
	350	#LDAP group mapping
	351	xwiki.authentication.ldap.group_mapping=XWiki.XWikiAdminGroup=CN=WIKI_Admin,............\|\
	352	XWiki.XWikiAllGroup=CN=WIKI_User,...........
34.1	353	{{/code}}
29.1	354
	355	The java code
34.1	356
	357	{{code}}
29.1	358	package com.wiki.sso;
	359
	360
	361	import org.apache.commons.logging.Log;
	362	import org.apache.commons.logging.LogFactory;
	363
	364	import com.xpn.xwiki.XWikiContext;
	365	import com.xpn.xwiki.XWikiException;
	366	import com.xpn.xwiki.user.api.XWikiUser;
	367	import com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl;
	368
	369	import java.security.Principal;
	370
	371	public class SSOLdapAuthenicationImpl extends XWikiLDAPAuthServiceImpl {
	372	/**
	373	* Logging tool.
	374	*/
	375	private static final Log LOG = LogFactory.getLog(SSOLdapAuthenicationImpl.class);
	376
	377
	378	public XWikiUser checkAuth(XWikiContext context) throws XWikiException {
	379	String user = getRemoteUser(context);
	380	if ((user != null) \|\| !user.equals("")) {
	381	if (LOG.isInfoEnabled())
	382	LOG.info("Launching create user for " + user);
	383	if ( authenticate(user, context) != null ) {
	384	if (LOG.isInfoEnabled())
	385	LOG.info("Create user done for " + user);
	386	user = "XWiki." + user;
	387	context.setUser(user);
	388	System.out.println("User is set to:" + user);
	389	return new XWikiUser(user);
	390	} else {
	391	LOG.error( "User " + user + " can't be authenticated against ldap" );
	392	}
	393	}
	394	return super.checkAuth(context);
	395	}
	396
	397	/**
	398	* We cannot authenticate locally since we need to trust the app server for
	399	* authentication
	400	*
	401	* @param username
	402	* @param password
	403	* @param context
	404	* @return
	405	* @throws XWikiException
	406	*/
	407	public XWikiUser checkAuth(String username, String password,
	408	String rememberme, XWikiContext context) throws XWikiException {
	409	String user = getRemoteUser(context);
	410	if ((user == null) \|\| user.equals("")) {
	411	return super.checkAuth(username, password, rememberme, context);
	412	}
	413	return checkAuth(context);
	414	}
	415
	416	private String getRemoteUser(XWikiContext context) {
	417	String userName = context.getRequest().getHttpServletRequest()
	418	.getRemoteUser();
	419	if (userName != null) {
	420	// only take the front of the username@domain
	421	String[] elements = userName.split("@", 2);
	422	userName = elements[0];
	423	}
	424	return userName;
	425	}
	426
	427	public Principal authenticate(String login, XWikiContext context) throws XWikiException
	428	{
	429	if (LOG.isTraceEnabled()) {
	430	LOG.trace("Starting LDAP authentication");
	431	}
	432
	433	/*
	434	* TODO: Put the next 4 following "if" in common with XWikiAuthService to ensure coherence This method was
	435	* returning null on failure so I preserved that behaviour, while adding the exact error messages to the context
	436	* given as argument. However, the right way to do this would probably be to throw XWikiException-s.
	437	*/
	438
	439	if (login == null) {
	440	// If we can't find the username field then we are probably on the login screen
	441
	442	if (LOG.isDebugEnabled()) {
	443	LOG.debug("The provided user is null."
	444	+ " We don't try to authenticate, it probably means the user is in non logged mode.");
	445	}
	446
	447	return null;
	448	}
	449
	450	// Check for empty usernames
	451	if (login.equals("")) {
	452	context.put("message", "nousername");
	453
	454	if (LOG.isDebugEnabled()) {
	455	LOG.debug("LDAP authentication failed: login empty");
	456	}
	457
	458	return null;
	459	}
	460
	461	// If we have the context then we are using direct mode
	462	// then we should specify the database
	463	// This is needed for virtual mode to work
	464	Principal principal = null;
	465
	466	// Try authentication against ldap
	467	principal = ldapAuthenticate(login, "", context);
	468
	469	if (LOG.isDebugEnabled()) {
	470	if (principal != null) {
	471	LOG.debug("LDAP authentication succeed with principal [" + principal.getName() + "]");
	472	} else {
	473	LOG.debug("LDAP authentication failed for user [" + login + "]");
	474	}
	475	}
	476
	477	return principal;
	478	}
	479	}
34.1	480	{{/code}}

Wiki source code of User Authentication

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