Wiki source code of User Authentication

Version 53.1 by Thomas Mortagne on 2012/05/21

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
52.1	165	Java based and Open Source:
34.1	166	* [[Apache Directory Studio>>http://directory.apache.org/studio/]]
51.1	167	* [[JXplorer>>http://jxplorer.org]]
1.19	168
52.1	169	Windows only:
	170	* [[Softerra LDAP Browser>>http://www.ldapbrowser.com/download.htm]]
	171
34.2	172	== Detailed use cases ==
12.1	173
34.1	174	See [[LDAP configuration uses cases>>LDAPAuthenticationUseCases]] for some detailed use cases.
25.1	175
34.2	176	== Enable LDAP debug log ==
34.1	177
42.1	178	See [[AdminGuide.Logging]].
34.1	179
45.1	180	The specific packages to track for LDAP are ##com.xpn.xwiki.plugin.ldap## and ##com.xpn.xwiki.user.impl.LDAP##.
27.1	181
49.1	182	In XWiki 3.4 you need to add the following in ##WEB-INF/classes/logback.xml##:
	183
	184	{{code}}
	185	<!-- LDAP debugging -->
	186	<logger name="com.xpn.xwiki.plugin.ldap" level="trace"/>
	187	<logger name="com.xpn.xwiki.user.impl.LDAP" level="trace"/>
	188	{{/code}}
	189
42.1	190	Before 3.1, add the following to the log4j configuration file:
	191
44.1	192	{{code}}
	193	log4j.logger.com.xpn.xwiki.plugin.ldap=trace
	194	log4j.logger.com.xpn.xwiki.user.impl.LDAP=trace
	195	{{/code}}
	196
34.2	197	= eXo Authentication =
30.1	198
34.1	199	The eXo authentication is used automatically by adding/editing the //xwiki.exo=1// property in //WEB-INF/xwiki.cfg//.
1.1	200
34.2	201	= Custom Authentication =
1.1	202
	203	This allows plugging to any existing authentication mechanism such as SiteMinder, etc. To configure a custom authentication do the following:
	204
47.2	205	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	206	1. Edit the //WEB-INF/xwiki.cfg// file and add a //xwiki.authentication.authclass// property pointing to your class. For example:
	207
	208	{{code}}
1.1	209	xwiki.authentication.authclass = com.acme.MyCustomAuthenticationService
34.1	210	{{/code}}
1.1	211
34.1	212	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	213
47.2	214	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	215
	216	{{code}}
5.1	217	xwiki.authentication.rightsclass = com.acme.MyCustomRightsService
34.1	218	{{/code}}
4.1	219
47.2	220	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	221
34.1	222	{{code}}
27.3	223	xwiki.authentication.groupclass = com.acme.MyCustomGroupService
34.1	224	{{/code}}
4.1	225
34.2	226	== Custom Authentication using a Groovy script in a wiki page ==
28.1	227
	228	Start by specifying you want to use the Groovy Authenticator:
	229
34.1	230	{{code}}
28.1	231	xwiki.authentication.authclass = com.xpn.xwiki.user.impl.xwiki.GroovyAuthServiceImpl
34.1	232	{{/code}}
28.1	233
	234	Then add another configuration parameter to specify in which wiki page the authenticator is:
	235
34.1	236	{{code}}
28.1	237	xwiki.authentication.groovy.pagename = MySpace.MyPage
34.1	238	{{/code}}
28.1	239
	240	Then in a wiki page put some Groovy code that returns a XWikiAuthService object.
	241
37.1	242	= Authentication parameters =
1.14	243
	244	You can set each of these parameters by setting:
	245
34.1	246	{{code}}
1.14	247	xwiki.authentication.~~param_name~~=~~param_value~~
34.1	248	{{/code}}
1.14	249
34.1	250	\|=Name\|=Optional\|=Allowed values\|=Default value\|=Description
	251	\|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.
	252	\|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.
	253	\|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
	254	\|cookielife\|Yes\|Number\|14\|Number of days cookies take to expire
	255	\|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//
	256	\|default_page\|Yes\|String\|/bin/view/ Main/WebHome\|Page to redirect to if xredirect parameter is not set
	257	\|encryptionalgorithm\|Yes\|?\|?\|Set the Encryption Algorithm used to encrypt and decrypt cookies
	258	\|encryptionmode\|Yes\|?\|?\|Set the Encryption Mode used to encrypt and decrypt cookies
	259	\|encryptionpadding\|Yes\|?\|?\|Set the Encryption Padding used to encrypt and decrypt cookies
	260	\|errorpage\|Yes\|String\|/bin/loginerror/ XWiki/XWikiLogin\|Page to redirect to if there is an error logging in
	261	\|loginpage\|Yes\|String\|/bin/login/ XWiki/XWikiLogin\|Page to redirect to when not logged in
35.1	262	\|loginsubmitpage\|Yes\|String\|/loginsubmit/ XWiki/XWikiLogin\|The URL where the username and password are posted to when logging in.
34.1	263	\|logoutpage\|Yes\|String\|/bin/logout/ XWiki/XWikiLogout\|Page to redirect to after logged out
	264	\|realmname\|Yes\|String\|XWiki\|Sets the realm name
	265	\|protection\|Yes\|all, validation, encryption, none\|all\|Protection level for the "remember me" cookie functionality
35.1	266	\|unauthorized_code\|Yes\|Number\|401\|The HTTP status code to return when the login has failed.
34.1	267	\|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	268
34.1	269	1. Only required if protection = encryption or all (default)
	270	1. Only required if protection = validation or all (default)
1.17	271
34.2	272	= Kerberos SSO Authentication =
21.1	273
34.1	274	{{warning}}
	275	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!
	276	{{/warning}}
	277
20.1	278	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	279
20.1	280	First of all you need to create a principal and keytab for the webserver:
34.1	281
	282	{{code}}
20.1	283	# kadmin
	284	kadmin> addprinc -randkey HTTP/wiki.example.com
	285	kadmin> ktadd -k /etc/apache2/ssl/wiki.keytab HTTP/wiki.example.com
	286	kadmin> quit
34.1	287	{{/code}}
10.1	288
20.1	289	Make sure the keytab has the right permissions and ownership:
34.1	290
	291	{{code}}
20.1	292	chown www-data:www-data /etc/apache2/ssl/wiki.keytab
	293	chmod 400 /etc/apache2/ssl/wiki.keytab
34.1	294	{{/code}}
11.1	295
20.1	296	Install mod_auth_kerb in your linux installation. On Debian or Ubuntu this would be achieved by running:
34.1	297
	298	{{code}}
20.1	299	aptitude install libapache2-mod-auth-kerb
34.1	300	{{/code}}
	301
20.1	302	Of course the installation procedure varies per Linux distribution.
	303
	304	If your xwiki installation is mounted in Apache HTTPD under /xwiki, add the following to the virtual host configuration:
34.1	305
	306	{{code}}
20.1	307	<Location /xwiki/>
	308	AuthType Kerberos
	309	AuthName "Kerberos Login"
	310	KrbAuthRealms EXAMPLE.COM
	311	Krb5Keytab "/etc/apache2/ssl/wiki.keytab"
	312	KrbMethodK5Passwd off
	313	KrbMethodNegotiate on
	314	KrbSaveCredentials on
	315	require valid-user
	316	</Location>
34.1	317	{{/code}}
20.1	318
	319	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	320
	321	{{code}}
20.1	322	<Connector port="8009" address="127.0.0.1" enableLookups="false" tomcatAuthentication="false" redirectPort="8443" protocol="AJP/1.3" />
34.1	323	{{/code}}
20.1	324
	325	Place the authkerb.jar jar in the WEB-INF/lib directory of Xwiki in Apache Tomcat.
	326
	327	Have Xwiki use the authentication module by changing the "xwiki.authentication.authclass" property in WEB-INF/lib/xwiki.cfg file.
34.1	328
	329	{{code}}
20.1	330	xwiki.authentication.authclass=com.xpn.xwiki.user.impl.xwiki.AppServerTrustedKerberosAuthServiceImpl
34.1	331	{{/code}}
20.1	332
34.1	333	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	334
34.1	335	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	336
34.2	337	The configuration of ldap:
29.1	338
34.1	339	{{code}}
29.1	340	xwiki.authentication.authclass=com.wiki.sso.SSOLdapAuthenicationImpl
	341	xwiki.authentication.ldap=1
	342	xwiki.authentication.ldap.server=<ad-server>
	343	xwiki.authentication.ldap.port=389
	344	xwiki.authentication.ldap.base_DN=<OU=Users,...............>
	345	#use a fixed user to attach to the ldap database,
	346	#the password is not provided with the SSOLdapAuthenicationImpl
	347	xwiki.authentication.ldap.bind_DN=<domain>\\<user>
	348	xwiki.authentication.ldap.bind_pass=<password>
	349	#Microsoft AD configuration
	350	xwiki.authentication.ldap.UID_attr=sAMAccountName
	351	xwiki.authentication.ldap.fields_mapping=name=sAMAccountName,last_name=sn,first_name=givenName,fullname=displayName,mail=mail,ldap_dn=dn
	352	xwiki.authentication.ldap.group_memberfields=member,uniqueMember
	353	#LDAP group mapping
	354	xwiki.authentication.ldap.group_mapping=XWiki.XWikiAdminGroup=CN=WIKI_Admin,............\|\
	355	XWiki.XWikiAllGroup=CN=WIKI_User,...........
34.1	356	{{/code}}
29.1	357
	358	The java code
34.1	359
	360	{{code}}
29.1	361	package com.wiki.sso;
	362
	363
	364	import org.apache.commons.logging.Log;
	365	import org.apache.commons.logging.LogFactory;
	366
	367	import com.xpn.xwiki.XWikiContext;
	368	import com.xpn.xwiki.XWikiException;
	369	import com.xpn.xwiki.user.api.XWikiUser;
	370	import com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl;
	371
	372	import java.security.Principal;
	373
	374	public class SSOLdapAuthenicationImpl extends XWikiLDAPAuthServiceImpl {
	375	/**
	376	* Logging tool.
	377	*/
	378	private static final Log LOG = LogFactory.getLog(SSOLdapAuthenicationImpl.class);
	379
	380
	381	public XWikiUser checkAuth(XWikiContext context) throws XWikiException {
	382	String user = getRemoteUser(context);
	383	if ((user != null) \|\| !user.equals("")) {
	384	if (LOG.isInfoEnabled())
	385	LOG.info("Launching create user for " + user);
	386	if ( authenticate(user, context) != null ) {
	387	if (LOG.isInfoEnabled())
	388	LOG.info("Create user done for " + user);
	389	user = "XWiki." + user;
	390	context.setUser(user);
	391	System.out.println("User is set to:" + user);
	392	return new XWikiUser(user);
	393	} else {
	394	LOG.error( "User " + user + " can't be authenticated against ldap" );
	395	}
	396	}
	397	return super.checkAuth(context);
	398	}
	399
	400	/**
	401	* We cannot authenticate locally since we need to trust the app server for
	402	* authentication
	403	*
	404	* @param username
	405	* @param password
	406	* @param context
	407	* @return
	408	* @throws XWikiException
	409	*/
	410	public XWikiUser checkAuth(String username, String password,
	411	String rememberme, XWikiContext context) throws XWikiException {
	412	String user = getRemoteUser(context);
	413	if ((user == null) \|\| user.equals("")) {
	414	return super.checkAuth(username, password, rememberme, context);
	415	}
	416	return checkAuth(context);
	417	}
	418
	419	private String getRemoteUser(XWikiContext context) {
	420	String userName = context.getRequest().getHttpServletRequest()
	421	.getRemoteUser();
	422	if (userName != null) {
	423	// only take the front of the username@domain
	424	String[] elements = userName.split("@", 2);
	425	userName = elements[0];
	426	}
	427	return userName;
	428	}
	429
	430	public Principal authenticate(String login, XWikiContext context) throws XWikiException
	431	{
	432	if (LOG.isTraceEnabled()) {
	433	LOG.trace("Starting LDAP authentication");
	434	}
	435
	436	/*
	437	* TODO: Put the next 4 following "if" in common with XWikiAuthService to ensure coherence This method was
	438	* returning null on failure so I preserved that behaviour, while adding the exact error messages to the context
	439	* given as argument. However, the right way to do this would probably be to throw XWikiException-s.
	440	*/
	441
	442	if (login == null) {
	443	// If we can't find the username field then we are probably on the login screen
	444
	445	if (LOG.isDebugEnabled()) {
	446	LOG.debug("The provided user is null."
	447	+ " We don't try to authenticate, it probably means the user is in non logged mode.");
	448	}
	449
	450	return null;
	451	}
	452
	453	// Check for empty usernames
	454	if (login.equals("")) {
	455	context.put("message", "nousername");
	456
	457	if (LOG.isDebugEnabled()) {
	458	LOG.debug("LDAP authentication failed: login empty");
	459	}
	460
	461	return null;
	462	}
	463
	464	// If we have the context then we are using direct mode
	465	// then we should specify the database
	466	// This is needed for virtual mode to work
	467	Principal principal = null;
	468
	469	// Try authentication against ldap
	470	principal = ldapAuthenticate(login, "", context);
	471
	472	if (LOG.isDebugEnabled()) {
	473	if (principal != null) {
	474	LOG.debug("LDAP authentication succeed with principal [" + principal.getName() + "]");
	475	} else {
	476	LOG.debug("LDAP authentication failed for user [" + login + "]");
	477	}
	478	}
	479
	480	return principal;
	481	}
	482	}
34.1	483	{{/code}}

Wiki source code of User Authentication

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