]po[ Active Directory LDAP

This package establishes an interface between ]po[ and the MS-Windows authentication infrastructure with Active Directory LDAP using the “ldapsearch” command line tool from the “OpenLDAP” Linux RPM.

Obtaining the Right Version of ldapsearch

The "ldapsearch" tool is available in two versions with completely incompatible command line parameters:

• as part of "OpenLDAP" and
• as part of "OpenLDAP2" or MozLDAP (Mozilla LDAP package).
  

For the purpose of this ]project-open[ LDAP package we need the version from OpenLDAP. To check if you got the right version please enter:

# ldapsearch -h

Obtaining the ]po[ Package

The package “auth-ldap-adldapsearch” is included in the standard of ]po[ installer, starting with V3.4. You can obtain the software via CVS if you are running an earlier version of ]po[:

# cd /web/projop/packages
# cvs -d :pserver:anonymous@cvs.project-open.net:/cvsroot/ checkout auth-ldap-adldapsearch

The required "OpenLDAP" Linux RPM is part of all major Linux distributions and included in the ]po[ VMware installers. OpenLDAP is a stable package with few changes in the last years, so most versions of it should work together with ]po[.

Installing “auth-ldap-adldapsearch”

Please make sure the package are available in the /packages/ directory of your ]po[ installation. Then go to /acs-admin/apm/ URL and select “Install New Packages” and select the package for installation. Restart the server and go back again to /acs-admin/apm/ and check that the package is available

Configuring LDAP Access To Microsoft Active Directory

Before configuring the LDAP module, we recommend that you test the LDAP connection manually using the command line. ]po[ relies on the “ldapsearch” command line tool to establish a connection to the LDAP server, so you can test the connection manually before configuring ]po[.

Test Connection Parameters

To check the validity of a username/password combination, we use the “ldapsearch –n” comand, which doesn’t perform any specific action, but returns an error if the username/password combination is wrong. An example call of the tool may look like this:

­# ldapsearch -n -x -H ldap://ldap.project-open.com -D u=ben.bigboss \
@tigerpond.com,ou=People,dc=tigerpond,dc=com -w secret

This command should return a 0 return code and a first line NOT containing “Invalid credentials (49)”. For details please see the ldapsearch “man” page for details.

Setup a new LDAP Authority

The next step is to setup a new OpenACS “Authentication Authority”. This object controls the authentication of users:

• Go to Admin -> Auth Authorities (URL: /acs-admin/auth/)
• Create a new Authority with the following values:
• General Name: “LDAP”
• Short Name: “LDAP”
• Enabled: “Yes”
• Authentication: “LDAP”
• Password Management: “LDAP”
• Account Registration: “LDAP”
• User Info: “LDAP”
• Batch sync enabled: “No”
• GetDocument implementation: “--Disabled—“
• ProcessDocument implementation: “--Disabled—“
• Go back to the list of Authorites, click on your new Autority and choose ”Configure drivers for this authority”.
  In this page you will need to set specifc LDAP parameters that will differ between organizations.
  The example below allows to import data from a AD server with the IP 192.168.1.2 for the domain "project-open.com".
  

BaseDN	Base DN when searching for users. Typically something like 'o=Your Org Name', or 'dc=yourdomain,dc=com'
BindDN	How to form the user DN? Active Directory accepts emails like {username}@project-open.com
GroupMap	A TCL list represnting a map form LDAP groups to PO groups. Example: 'Users 463 Administrators 459' maps Windows 'Users' to Employees and Windows 'Administrators' to PO Admins.
LdapURI	URI of the host to access. Something like ldap://ldap.project-open.com/
PasswordHash	The hash to use when storing passwords. Supported values are MD5, SMD5, SHA, SSHA, and CRYPT.
SearchFilter	An optional LDAP expression to limit the users to be imported. Example: '(memberOf=cn=PO-Users,cn=Users,dc=project-open,dc=com)' would only import users who are member of the LDAP group 'PO-Users'.
ServerType	'ad' for Microsoft Active Directory of 'ol' for OpenLDAP (without the single quotes).
SystemBindDN	DN of an LDAP system user that allows PO to access the LDAP for batch synchronization. Example: 'cn=Administrator,cn=Users,dc=project-open,dc=com'. Leave empty if your LDAP allows anonymous access.
SystemBindPW	Password for the SystemBindDN.
UsernameAttribute	LDAP attribute to match username against, typically uid

You can leave the remaining fields empty. 

Enabling LDAP on the Login Page

Please go to Admin -> Parameters -> Kernel Parameters and set the parameter UseEmailForLoginP to 0. With "username" instead of "email" enabled for user login, the login screen will now show an additional drop-down box for the selection of the [Authentication Authority].

Before testing your new login method, please go to "My Account" and click on the "Edit" button of the user "Basic Information" and check the value of "Username". Otherwise you may lock yourself out!

Debugging the ]project-open[ - Active Directory LDAP Interface

• Invalid user: Your authentication was successful, but your user account does not exist in our database:
  Please update the users.authority_id to the user's LDAP authority: "update users set authority_id = xxx where username = 'yyy';". You can find out about your authorities using "select * from auth_authorities;".

# cd /web/projop/log
# tail -f error.log | grep ldapsearch

­This command will give you only the calls to “ldapsearch”. Copy & past these lines and execute them manually in the command line in order to drill-down further.

Important Notes

• Users and Authorities:
  Users are registered for a specific autentication "authority". Please (V3.4.0.8 or higher) enable the parameters "EnableUsersAuthorityP" and "EnableUsersUsernameP" in Admin -> Parameters -> intranet-core. With these parameters set to "1", you will see two additional fields if you go to Users -> One User -> Edit. When testing the LDAP driver, please make sure that your test user is set to the tested "authority".

References ­

Open Discussion Forum

• Please see also:  https://sourceforge.net/projects/project-open/forums/forum/295937/topic/3363649
  

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