Redmine

h1. LDAP Authentication

Redmine natively supports LDAP authentication using one or multiple LDAP directories.

h2. Declaring the LDAP

Go to Administration and click *LDAP authentication* in the menu.

Enter the following:

* *Name*: an arbitrary name for the directory

* *Host*: the LDAP host name

* *Port*: the LDAP port (default is 389)

* *LDAPS*: check this if you want or need to use LDAPS to access the directory

* *Account*: enter a username that has read access to the LDAP , otherwise leave this field empty if your LDAP can be read anonymously (Active Directory servers generally do not allow anonymous access)

* *Password*: password for the account

* *Base DN*: the top level DN of your LDAP directory tree

* *Login attribute*: enter the name of the LDAP attribute that will be used as the Redmine username

Redmine users should now be able to authenticate using their LDAP username and password if their accounts are set to use the LDAP for authentication.

To test this, create a Redmine user with a login that matches his LDAP account, select the newly created LDAP in the *Authentication mode* drop-down list (this field is visible on the account screen only if a LDAP is declared) and leave his password empty. Try to log in into Redmine using the LDAP username and password.

h2. On the fly user creation

By checking *on-the-fly user creation*, any LDAP user will have his Redmine account automatically created the first time he logs into Redmine.

For that, you have to specify the LDAP attributes name (firstname, lastname, email) that will be used to create their Redmine accounts.

Here is an typical example using Active Directory:

<pre>

Name     = My Directory

Host     = host.domain.org

Port     = 389

LDAPS    = no

Account  = MyDomain\UserName (or UserName@MyDomain depending on AD server)

Password = <password>

Base DN  = CN=users,DC=host,DC=domain,DC=org

On-the-fly user creation = yes

Attributes

  Login     = sAMAccountName

  Firstname = givenName

  Lastname  = sN

  Email     = mail

</pre>

Here is another example for Active Directory with a compartmentalized intranet:

<pre>

Name     = Just a description for the auth modes page

Host     = DepartmentName.OrganizationName.local

Port     = 389

LDAPS    = no

Account  = DepartmentName\UserName (or UserName@MyDomain depending on AD server or bind DN uid=Manager,cn=users,dc=MyDomain,dc=com)

Password = <password>

Base DN  = DC=DepartmentName,DC=OrganizationName,DC=local

On-the-fly user creation = yes

Attributes

  Login     = sAMAccountName

  Firstname = givenName

  Lastname  = sN

  Email     = mail

</pre>

Note that LDAP attribute names are *case sensitive*.

h3. Base DN variants

Although it's quite possible that the Base DN above is standard for Active Directory, the Active Directory at my employer's site does not use the Users container for standard users, so those instructions sent me down a long and painful path.  I recommend also trying just "DC=host,DC=domain,DC=org" if login fail swith the settings there.

h2. Troubleshooting

If you want to use on-the-fly user creation, make sure that Redmine can fetch from your LDAP all the required information to create a valid user.

For example, on-the-fly user creation won't work if you don't have valid email adresses in your directory (you will get an 'Invalid username/password' error message when trying to log in).

(This is not true with newer Redmine versions; the user creation dialog is populated with everything it can find from the LDAP server, and asks the new user to fill in the rest.)

Also, make sure you don't have any custom field marked as *required* for user accounts. These custom fields would prevent user accounts from being created on the fly.

Errors in the login system are not reported with any real information in the Redmine logs, which makes troubleshooting difficult.  However, you can found most of the information you need using ??Wireshark?? between your Redmine host and the LDAP server. Note that this only works if you have permissions to read network traffic between those two hosts.

h3. ??Account?? value format

The username for the bind credentials might need to be specified as a DN(i.e. CN=user,OU=optional,DC=domain,DC=com) rather than as a UPN(user@domain.com) or as ??domain\user??, as pointed out by this comment in source:trunk/vendor/plugins/ruby-net-ldap-0.0.4/lib/net/ldap.rb:

<pre>

  # As described under #bind, most LDAP servers require that you supply a complete DN

  # as a binding-credential, along with an authenticator such as a password.

</pre>

h3. OpenDS 

If you are using the OpenDS server, you might have issues with the request control "Paged results" sent with the initial query searching for the user by the specified login attribute. This request control 1.2.840.113556.1.4.319 is not allowed for anonymous users by default, thus preventing redmine from finding the user in the directory even before the binding takes place.

Add a global ACI like this

<pre>

./dsconfig -h SERVER_IP -p 4444 -D cn="Directory Manager" -w PASSWORD -n set-access-control-handler-prop --trustAll 

--add global-aci:\(targetcontrol=\"1.2.840.113556.1.4.319\"\)\ \(version\ 3.0\;\ acl\ 

\"Anonymous\ control\ access\ to\ 1.2.840.113556.1.4.319\"\;\ allow\ \(read\)\ userdn=\"ldap:///anyone\"\;\)

</pre>Note: Enter the command on one line, use the escaping exactly as indicated (the \ after "acl" is meant to be "\ " for a space).