Merge pull request #936 from mkorobeinikov/master

OpenVPN with LDAP example

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+:lastproofread: 2023-01-29
+
+.. _examples-openvvpn-ldap:
+
+OpenVPN with LDAP example
+-------------------
+
+Configuration AD and a windows server
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+We aim to configure LDAP authentication between the VYOS router and Windows Server 2019 (role: Active Directory) when our customers connect to our privet network using the OpenVPN client.
+Using the general schema for example:
+
+.. image:: /_static/images/mainschema.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+
+.. code-block:: none
+
+  VyOS - the main OpenVPN server
+  Winserver - windows server with role Active Directory 
+  Win10-PC - OpenVPN customer with LDAP authentication
+
+First, we need to configure the AD service and create two accounts. One account for the LDAP adapter built into the VYOS router and a second even account for our test client.
+
+.. image:: /_static/images/ldapone.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+   
+Picture 1 - Adding the AD role
+
+.. image:: /_static/images/ldaptwo.png
+   :width: 80%
+   :align: center
+   :alt: Network Topology Diagram
+   
+Picture 2 - Adding the AD role
+
+Configuration VyOS router
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Make the configuration file for the LDAP plugin.
+
+.. code-block:: none
+
+	vyos@vyos:~$ sudo cat /config/auth/ldap-auth.config
+	<LDAP>
+	URL ldap://10.217.80.58
+	BindDN userldap@corp.vyos.com
+	Password YourPass
+	Timeout 15
+	TLSEnable no
+	FollowReferrals no
+	</LDAP>
+	<Authorization>
+	BaseDN "DC=corp,DC=vyos,DC=com"
+	SearchFilter "sAMAccountName=%u"
+	RequireGroup false
+	</Authorization>
+
+
+**This specific example is for a windows server 2019**:
+
+* URL ldap://10.217.80.58 - The URL of your LDAP server
+* BindDN userldap@corp.vyos.com - The BindDN of the users' directory 
+* BaseDN "DC=corp,DC=vyos,DC=com" - In the block <Authorization> notice your domain
+
+Make the main config for VyOS like VPN and Authorization server:
+
+.. code-block:: none
+
+	set interfaces ethernet eth0 address 'dhcp'
+	set interfaces openvpn vtun10 local-port '1194'
+	set interfaces openvpn vtun10 mode 'server'
+	set interfaces openvpn vtun10 openvpn-option '--plugin /usr/lib/openvpn/openvpn-auth-ldap.so /config/auth/ldap-auth.config'
+	set interfaces openvpn vtun10 persistent-tunnel
+	set interfaces openvpn vtun10 protocol 'udp'
+	set interfaces openvpn vtun10 server push-route 192.168.0.0/16
+	set interfaces openvpn vtun10 server subnet '10.23.1.0/24'
+	set interfaces openvpn vtun10 tls ca-cert-file '/config/auth/openvpn/ca.crt'
+	set interfaces openvpn vtun10 tls cert-file '/config/auth/openvpn/central.crt'
+	set interfaces openvpn vtun10 tls crl-file '/config/auth/openvpn/crl.pem'
+	set interfaces openvpn vtun10 tls dh-file '/config/auth/openvpn/dh.pem'
+	set interfaces openvpn vtun10 tls key-file '/config/auth/openvpn/central.key'
+	set protocols static interface-route 10.23.0.0/20 next-hop-interface vtun10
+	set service ssh port '22'
+
+Next, you need to install and configure the configuration file for the windows/Linux OpenVPN client. After connecting to the VPN servers, you will be prompted to go through LDAP authorization.
+
+**To automatically generate the openVPN configuration file for windows clients, you can use this link:**
+https://ovpnconfig.com.br/
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