Wiki source code of User Authentication

Version 58.1 by Valdis Vitolins on 2012/10/11
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1 XWiki supports several different authentication mechanisms for authenticating users:
2
3 {{toc/}}
4
5 The form authentication is the default mechanism.
6
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}}
10
11 = Form Authentication =
12
13 Form authentication is the default way to get authenticated within a Wiki. It requires a user and a password.
14
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:[email protected]/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
27 = Social login extension =
28
29 See [[http://extensions.xwiki.org/xwiki/bin/view/Extension/Social+Login]]
30
31 = LDAP Authentication =
32
33 {{warning}}
34 New LDAP implementation since XWiki Platform 1.3M2, see [[previous LDAP authentication service documentation>>AuthenticationLdapOld]]
35 {{/warning}}
36
37 == Generic LDAP configuration ==
38
39 In order to enable the LDAP support you have to change the authentication method in //WEB-INF/xwiki.cfg// as follows:
40
41 {{code language="properties"}}
42 #-# LDAP authentication service
43 # xwiki.authentication.authclass=com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl
44
45 #-# Turn LDAP authentication on - otherwise only XWiki authentication
46 #-# - 0: disable
47 #-# - 1: enable
48 #-# The default is 1
49 # xwiki.authentication.ldap=1
50 {{/code}}
51
52 You can setup the LDAP configuration in the //xwiki.cfg// file by filling the following properties:
53
54 {{code language="properties"}}
55 #-# LDAP Server (Active Directory, eDirectory, OpenLDAP, etc.)
56 xwiki.authentication.ldap.server=127.0.0.1
57 xwiki.authentication.ldap.port=389
58
59 #-# LDAP login, empty = anonymous access, otherwise specify full dn
60 #-# {0} is replaced with the user name, {1} with the password
61 xwiki.authentication.ldap.bind_DN=cn={0},department=USER,department=INFORMATIK,department=1230,o=MP
62 xwiki.authentication.ldap.bind_pass={1}
63
64 #-# The Base DN used in LDAP searches
65 xwiki.authentication.ldap.base_DN=
66
67 #-# LDAP query to search the user in the LDAP database (in case a static admin user is provided in
68 #-# xwiki.authentication.ldap.bind_DN)
69 #-# {0} is replaced with the user uid field name and {1} with the user name
70 #-# The default is ({0}={1})
71 # xwiki.authentication.ldap.user_search_fmt=({0}={1})
72
73 #-# Only members of the following group will be verified in the LDAP
74 #-# otherwise only users that are found after searching starting from the base_DN
75 # xwiki.authentication.ldap.user_group=cn=developers,ou=groups,o=MegaNova,c=US
76
77 #-# [Since 1.5RC1, XWikiLDAPAuthServiceImpl]
78 #-# Only users not member of the following group can autheticate
79 # xwiki.authentication.ldap.exclude_group=cn=admin,ou=groups,o=MegaNova,c=US
80
81 #-# Specifies the LDAP attribute containing the identifier to be used as the XWiki name
82 #-# The default is cn
83 # xwiki.authentication.ldap.UID_attr=cn
84
85 #-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
86 #-# The potential LDAP groups classes. Separated by commas.
87 # xwiki.authentication.ldap.group_classes=group,groupOfNames,groupOfUniqueNames,dynamicGroup,dynamicGroupAux,groupWiseDistributionList
88
89 #-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
90 #-# The potential names of the LDAP groups fields containings the members. Separated by commas.
91 # xwiki.authentication.ldap.group_memberfields=member,uniqueMember
92
93 #-# retrieve the following fields from LDAP and store them in the XWiki user object (xwiki-attribute=ldap-attribute)
94 xwiki.authentication.ldap.fields_mapping=last_name=sn,first_name=givenName,email=mail
95
96 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
97 #-# On every login update the mapped attributes from LDAP to XWiki otherwise this happens only once when the XWiki
98 #-# account is created.
99 #-# - 0: only when creating user
100 #-# - 1: at each authentication
101 #-# The default is 0
102 xwiki.authentication.ldap.update_user=1
103
104 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
105 #-# Maps XWiki groups to LDAP groups, separator is "|". The following kind of groups are supported:
106 #-# * LDAP static groups (users/subgroups are listed statically in the group object)
107 #-# * [Since 3.3M1] LDAP organization units (users/subgroups are sub object of the provided organization unit)
108 #-# * [Since 3.3M1] LDAP filter (users/groups are object found in a search with the provided filter),
109 #-# | character in the filter need to be escaped with backslash (\).
110 #-#
111 #-# Here is an example:
112 # xwiki.authentication.ldap.group_mapping=XWiki.XWikiAdminGroup=cn=AdminRole,ou=groups,o=domain,c=com|\
113 # XWiki.LDAPUsers=ou=groups,o=domain,c=com|\
114 # XWiki.Organisation=(cn=testers)
115
116 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
117 #-# Time in s after which the list of members in a group is refreshed from LDAP
118 #-# The default is 21600 (6 hours)
119 # xwiki.authentication.ldap.groupcache_expiration=21600
120
121 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
122 #-# - create : synchronize group membership only when the user is first created
123 #-# - always: synchronize on every login
124 #-# The default is always
125 # xwiki.authentication.ldap.mode_group_sync=always
126
127 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
128 #-# If ldap authentication fails for any reason, try XWiki DB authentication with the same credentials
129 #-# - 0: disable
130 #-# - 1: enable
131 #-# The default is 0
132 xwiki.authentication.ldap.trylocal=1
133
134 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
135 #-# SSL connection to LDAP server
136 #-# - 0: normal
137 #-# - 1: SSL
138 #-# The default is 0
139 # xwiki.authentication.ldap.ssl=0
140
141 #-# [Since 1.3M2, XWikiLDAPAuthServiceImpl]
142 #-# The keystore file to use in SSL connection
143 # xwiki.authentication.ldap.ssl.keystore=
144
145 #-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
146 #-# The java secure provider used in SSL connection
147 #-# The default is com.sun.net.ssl.internal.ssl.Provider
148 # xwiki.authentication.ldap.ssl.secure_provider=com.sun.net.ssl.internal.ssl.Provider
149
150 #-# Bypass standard LDAP bind validation by doing a direct password comparison.
151 #-# If you don't know what you do, don't use that. It's covering very rare and bad use cases.
152 #-# - 0: disable
153 #-# - 1: enable
154 #-# The default is 0
155 # xwiki.authentication.ldap.validate_password=0
156
157 #-# [Since 1.5M1, XWikiLDAPAuthServiceImpl]
158 #-# Specifies the LDAP attribute containing the password to be used "when xwiki.authentication.ldap.validate_password"
159 #-# is set to 1
160 # xwiki.authentication.ldap.password_field=userPassword
161
162 #-# [Since 4.3M1, XWikiLDAPAuthServiceImpl]
163 #-# The maximum number of milliseconds the client waits for any operation under these constraints to complete.
164 #-# The default is 1000
165 # xwiki.authentication.ldap.timeout=1000
166 {{/code}}
167
168 {{info}}
169 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##.
170 {{/info}}
171
172 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.
173
174 Here are some LDAP client for checking your configuration:
175
176 Java based and Open Source:
177
178 * [[Apache Directory Studio>>http://directory.apache.org/studio/]]
179 * [[JXplorer>>http://jxplorer.org]]
180
181 Windows only:
182
183 * [[Softerra LDAP Browser>>http://www.ldapbrowser.com/download.htm]]
184
185 == Detailed use cases ==
186
187 See [[LDAP configuration uses cases>>LDAPAuthenticationUseCases]] for some detailed use cases.
188
189 == Enable LDAP debug log ==
190
191 See [[AdminGuide.Logging]].
192
193 The specific packages to track for LDAP are ##com.xpn.xwiki.plugin.ldap## and ##com.xpn.xwiki.user.impl.LDAP##.
194
195 In XWiki 3.4 you need to add the following in ##WEB-INF/classes/logback.xml##:
196
197 {{code}}
198 <!-- LDAP debugging -->
199 <logger name="com.xpn.xwiki.plugin.ldap" level="trace"/>
200 <logger name="com.xpn.xwiki.user.impl.LDAP" level="trace"/>
201 {{/code}}
202
203 Before 3.1, add the following to the log4j configuration file:
204
205 {{code}}
206 log4j.logger.com.xpn.xwiki.plugin.ldap=trace
207 log4j.logger.com.xpn.xwiki.user.impl.LDAP=trace
208 {{/code}}
209
210 = eXo Authentication =
211
212 The eXo authentication is used automatically by adding/editing the //xwiki.exo=1// property in //WEB-INF/xwiki.cfg//.
213
214 = Custom Authentication =
215
216 This allows plugging to any existing authentication mechanism such as SiteMinder, etc. To configure a custom authentication do the following:
217
218 1. Implement the {{scm path="xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/user/api/XWikiAuthService.java"}}XWikiAuthService{{/scm}} interface.
219 1. Edit the //WEB-INF/xwiki.cfg// file and add a //xwiki.authentication.authclass// property pointing to your class. For example:
220
221 {{code language="properties"}}
222 xwiki.authentication.authclass = com.acme.MyCustomAuthenticationService
223 {{/code}}
224
225 You can find various authenticators examples on https://github.com/xwiki-contrib/sandbox/blob/master/authenticators/.
226
227 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/]].
228
229 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:
230
231 {{code language="properties"}}
232 xwiki.authentication.rightsclass = com.acme.MyCustomRightsService
233 {{/code}}
234
235 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}}:
236
237 {{code language="properties"}}
238 xwiki.authentication.groupclass = com.acme.MyCustomGroupService
239 {{/code}}
240
241 == Custom Authentication using a Groovy script in a wiki page ==
242
243 Start by specifying you want to use the Groovy Authenticator:
244
245 {{code language="properties"}}
246 xwiki.authentication.authclass = com.xpn.xwiki.user.impl.xwiki.GroovyAuthServiceImpl
247 {{/code}}
248
249 Then add another configuration parameter to specify in which wiki page the authenticator is:
250
251 {{code language="properties"}}
252 xwiki.authentication.groovy.pagename = MySpace.MyPage
253 {{/code}}
254
255 Then in a wiki page put some Groovy code that returns a XWikiAuthService object.
256
257 = Authentication parameters =
258
259 You can set each of these parameters by setting:
260
261 {{code}}
262 xwiki.authentication.~~param_name~~=~~param_value~~
263 {{/code}}
264
265 |=Name|=Optional|=Allowed values|=Default value|=Description
266 |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.
267 |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.
268 |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
269 |cookielife|Yes|Number|14|Number of days cookies take to expire
270 |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//
271 |default_page|Yes|String|/bin/view/ Main/WebHome|Page to redirect to if xredirect parameter is not set
272 |encryptionalgorithm|Yes|?|?|Set the Encryption Algorithm used to encrypt and decrypt cookies
273 |encryptionmode|Yes|?|?|Set the Encryption Mode used to encrypt and decrypt cookies
274 |encryptionpadding|Yes|?|?|Set the Encryption Padding used to encrypt and decrypt cookies
275 |errorpage|Yes|String|/bin/loginerror/ XWiki/XWikiLogin|Page to redirect to if there is an error logging in
276 |loginpage|Yes|String|/bin/login/ XWiki/XWikiLogin|Page to redirect to when not logged in
277 |loginsubmitpage|Yes|String|/loginsubmit/ XWiki/XWikiLogin|The URL where the username and password are posted to when logging in.
278 |logoutpage|Yes|String|/bin/logout/ XWiki/XWikiLogout|Page to redirect to after logged out
279 |realmname|Yes|String|XWiki|Sets the realm name
280 |protection|Yes|all, validation, encryption, none|all|Protection level for the "remember me" cookie functionality
281 |unauthorized_code|Yes|Number|401|The HTTP status code to return when the login has failed.
282 |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.
283
284 1. Only required if protection = encryption or all (default)
285 1. Only required if protection = validation or all (default)
286
287 = Kerberos SSO Authentication =
288
289 {{warning}}
290 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!
291 {{/warning}}
292
293 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.
294
295 First of all you need to create a principal and keytab for the webserver:
296
297 {{code}}
298 # kadmin
299 kadmin> addprinc -randkey HTTP/wiki.example.com
300 kadmin> ktadd -k /etc/apache2/ssl/wiki.keytab HTTP/wiki.example.com
301 kadmin> quit
302 {{/code}}
303
304 Make sure the keytab has the right permissions and ownership:
305
306 {{code}}
307 chown www-data:www-data /etc/apache2/ssl/wiki.keytab
308 chmod 400 /etc/apache2/ssl/wiki.keytab
309 {{/code}}
310
311 Install mod_auth_kerb in your linux installation. On Debian or Ubuntu this would be achieved by running:
312
313 {{code}}
314 aptitude install libapache2-mod-auth-kerb
315 {{/code}}
316
317 Of course the installation procedure varies per Linux distribution.
318
319 If your xwiki installation is mounted in Apache HTTPD under /xwiki, add the following to the virtual host configuration:
320
321 {{code}}
322 <Location /xwiki/>
323 AuthType Kerberos
324 AuthName "Kerberos Login"
325 KrbAuthRealms EXAMPLE.COM
326 Krb5Keytab "/etc/apache2/ssl/wiki.keytab"
327 KrbMethodK5Passwd off
328 KrbMethodNegotiate on
329 KrbSaveCredentials on
330 require valid-user
331 </Location>
332 {{/code}}
333
334 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):
335
336 {{code}}
337 <Connector port="8009" address="127.0.0.1" enableLookups="false" tomcatAuthentication="false" redirectPort="8443" protocol="AJP/1.3" />
338 {{/code}}
339
340 Place the authkerb.jar jar in the WEB-INF/lib directory of Xwiki in Apache Tomcat.
341
342 Have Xwiki use the authentication module by changing the "xwiki.authentication.authclass" property in WEB-INF/lib/xwiki.cfg file.
343
344 {{code}}
345 xwiki.authentication.authclass=com.xpn.xwiki.user.impl.xwiki.AppServerTrustedKerberosAuthServiceImpl
346 {{/code}}
347
348 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.
349
350 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.
351
352 The configuration of ldap:
353
354 {{code}}
355 xwiki.authentication.authclass=com.wiki.sso.SSOLdapAuthenicationImpl
356 xwiki.authentication.ldap=1
357 xwiki.authentication.ldap.server=<ad-server>
358 xwiki.authentication.ldap.port=389
359 xwiki.authentication.ldap.base_DN=<OU=Users,...............>
360 #use a fixed user to attach to the ldap database,
361 #the password is not provided with the SSOLdapAuthenicationImpl
362 xwiki.authentication.ldap.bind_DN=<domain>\\<user>
363 xwiki.authentication.ldap.bind_pass=<password>
364 #Microsoft AD configuration
365 xwiki.authentication.ldap.UID_attr=sAMAccountName
366 xwiki.authentication.ldap.fields_mapping=name=sAMAccountName,last_name=sn,first_name=givenName,fullname=displayName,mail=mail,ldap_dn=dn
367 xwiki.authentication.ldap.group_memberfields=member,uniqueMember
368 #LDAP group mapping
369 xwiki.authentication.ldap.group_mapping=XWiki.XWikiAdminGroup=CN=WIKI_Admin,............|\
370 XWiki.XWikiAllGroup=CN=WIKI_User,...........
371 {{/code}}
372
373 The java code
374
375 {{code}}
376 package com.wiki.sso;
377
378
379 import org.apache.commons.logging.Log;
380 import org.apache.commons.logging.LogFactory;
381
382 import com.xpn.xwiki.XWikiContext;
383 import com.xpn.xwiki.XWikiException;
384 import com.xpn.xwiki.user.api.XWikiUser;
385 import com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl;
386
387 import java.security.Principal;
388
389 public class SSOLdapAuthenicationImpl extends XWikiLDAPAuthServiceImpl {
390 /**
391 * Logging tool.
392 */
393 private static final Log LOG = LogFactory.getLog(SSOLdapAuthenicationImpl.class);
394
395
396 public XWikiUser checkAuth(XWikiContext context) throws XWikiException {
397 String user = getRemoteUser(context);
398 if ((user != null) || !user.equals("")) {
399 if (LOG.isInfoEnabled())
400 LOG.info("Launching create user for " + user);
401 if ( authenticate(user, context) != null ) {
402 if (LOG.isInfoEnabled())
403 LOG.info("Create user done for " + user);
404 user = "XWiki." + user;
405 context.setUser(user);
406 System.out.println("User is set to:" + user);
407 return new XWikiUser(user);
408 } else {
409 LOG.error( "User " + user + " can't be authenticated against ldap" );
410 }
411 }
412 return super.checkAuth(context);
413 }
414
415 /**
416 * We cannot authenticate locally since we need to trust the app server for
417 * authentication
418 *
419 * @param username
420 * @param password
421 * @param context
422 * @return
423 * @throws XWikiException
424 */
425 public XWikiUser checkAuth(String username, String password,
426 String rememberme, XWikiContext context) throws XWikiException {
427 String user = getRemoteUser(context);
428 if ((user == null) || user.equals("")) {
429 return super.checkAuth(username, password, rememberme, context);
430 }
431 return checkAuth(context);
432 }
433
434 private String getRemoteUser(XWikiContext context) {
435 String userName = context.getRequest().getHttpServletRequest()
436 .getRemoteUser();
437 if (userName != null) {
438 // only take the front of the username@domain
439 String[] elements = userName.split("@", 2);
440 userName = elements[0];
441 }
442 return userName;
443 }
444
445 public Principal authenticate(String login, XWikiContext context) throws XWikiException
446 {
447 if (LOG.isTraceEnabled()) {
448 LOG.trace("Starting LDAP authentication");
449 }
450
451 /*
452 * TODO: Put the next 4 following "if" in common with XWikiAuthService to ensure coherence This method was
453 * returning null on failure so I preserved that behaviour, while adding the exact error messages to the context
454 * given as argument. However, the right way to do this would probably be to throw XWikiException-s.
455 */
456
457 if (login == null) {
458 // If we can't find the username field then we are probably on the login screen
459
460 if (LOG.isDebugEnabled()) {
461 LOG.debug("The provided user is null."
462 + " We don't try to authenticate, it probably means the user is in non logged mode.");
463 }
464
465 return null;
466 }
467
468 // Check for empty usernames
469 if (login.equals("")) {
470 context.put("message", "nousername");
471
472 if (LOG.isDebugEnabled()) {
473 LOG.debug("LDAP authentication failed: login empty");
474 }
475
476 return null;
477 }
478
479 // If we have the context then we are using direct mode
480 // then we should specify the database
481 // This is needed for virtual mode to work
482 Principal principal = null;
483
484 // Try authentication against ldap
485 principal = ldapAuthenticate(login, "", context);
486
487 if (LOG.isDebugEnabled()) {
488 if (principal != null) {
489 LOG.debug("LDAP authentication succeed with principal [" + principal.getName() + "]");
490 } else {
491 LOG.debug("LDAP authentication failed for user [" + login + "]");
492 }
493 }
494
495 return principal;
496 }
497 }
498 {{/code}}

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