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===== configure LDAP authentication =====

**Prerequisitions**\\

Configuration file ''ldap.conf'' must be created as a simple text file in the following folder 

<code>
“c:\openldap\sysconf\ldap.conf”
</code>

This file path is hardcoded in the ldap related dll file of the php installation, therefore there is no soultion to place the ''ldap.conf'' file in any other place.

In the file ''ldap.conf'' the certificate-folder and certificate-file path can be set. The client certificate checking method can be specified as well. These can be set with the next three directives what you can define in the ''ldap.conf'' file:

**''TLS_REQCERT''**\\
This directive specifies which checks to perform on client certificates in an incoming TLS session, if any.
 
Accepted values are: 
  * ''never''
  * ''allow''
  * ''try''
  * ''demand''
 
In the case of self-signed certificates it is recommended to use the ''never'' or the ''allow'' setting. 

E.g.: 
<code>
TLS_REQCERT allow
</code>
**Important**\\
Even if the setting is set to ''never'' the certificate must exist and the path must be set correctly! The setting does not mean that you do not have to own the certificate.

**''TLS_CACERT''**\\ 
Certificate file path. The certificate must not be placed in the same folder as the ''ldap.conf'' file but it is also not a problem to place it into the folder ''c:\openldap\sysconf''

Example 1
<code>
TLS_CACERT c:\path\to\certification_dir\file.cer
</code>

Example 2
<code>
TLS_CACERT c:\openldap\sysconf\certificate.cer
</code>

**Important**\\
The certification file content must be in Base64 format. You can check it for example by opening the certificate in Notepad. Content should look like this example:

<code>
-----BEGIN CERTIFICATE-----
MIIDqjCCApKgAwIBAgIJAPsChKSq04oyMA0GCSqGSIb3DQEBCwUAMGYxCzAJBgNV
BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
...
-----END CERTIFICATE-----
</code>


**''TLS_CACERTDIR''** 
Certificate folder path. The certificate must not be placed in the same folder as the ''ldap.conf'' file but it is also not a problem to place this into that folder ''c:\openldap\sysconf''.

Example 1 
<code>
TLS_ CACERTDIR c:\path\to\certification_dir\
</code>

Example 2
<code>
TLS_ CACERTDIR c:\openldap\sysconf\
</code>


**Note**
----
There are openssl related php settings in the configuration file ''c:\Program Files\php-7.3.8_x64\php.ini'' (;openssl.cafile and ;openssl.capath) but those do not have effect on settings set in file ''ldap.conf'' or on LDAPS connection. So the proper settings must be set in file ''c:\openldap\sysconf\ldap.conf''
----

For more information visit the openLDAP documentation at: https://www.openldap.org/doc/admin21/tls.html


   * Restart Apache

remarks
----
On niota administrative pages at menu item ''User management'' the ''Userid LDAP'' setting is not in use anymore. The user input of the login screen will be used for authentication against the LDAP(S) server.

On niota administrative pages at menu item “User management” select the user who will get right to LDAP(S) authentication. Then mark checkbox: “LDAP active” and save the settings.

Now the edited user can use only his/her LDAP credentials to log in.
----


  * set LDAP(S) connection in file ''niota/conf/connections.php'' 

Sample configuration file: “niota\app\conf\connections_sample.php”.

<code>
const ET_LDAP_AUTHENTICATION = array(
	//ldaps
	PHPGRID_DB_HOSTNAME	=>"ldaps://my.hostname.com:636",
	PHPGRID_DB_DN 		=>"dc=my,dc=hostname,dc=com",
		
	//simple ldap
	//PHPGRID_DB_HOSTNAME	=>"ldap://my.hostname.com:389",
	//PHPGRID_DB_DN 	=>"dc=my,dc=hostname,dc=com",
);
</code>
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