mirror of
https://github.com/opnsense/docs
synced 2024-11-15 06:12:58 +00:00
176 lines
8.2 KiB
ReStructuredText
176 lines
8.2 KiB
ReStructuredText
===========================================
|
|
IPsec: Setup OPNsense for IKEv1 using XAuth
|
|
===========================================
|
|
|
|
.. contents:: Index
|
|
|
|
XAuth was an addition to IKEv1 supporting user authentication credentials additionally to
|
|
pre-shared keys or certificates. There are three different types supported by OPNsense which
|
|
we will describe here.
|
|
|
|
Mutual PSK + XAuth: You define a pre-shared key which is the same for every user and after securing
|
|
the channel the user authentication via XAuth comes into play.
|
|
Mutual RSA + XAuth: Instead of using a pre-shared key, every device needs a client certificate to secure
|
|
the connection plus XAuth for authentication. This is the most secure variant for IKEv1/XAuth but also
|
|
with the most work to do.
|
|
Hybrid RSA + XAuth: Hybrid RSA is the same as Mutual, without the need for a client certificate. Only
|
|
the server will be authenticated (like using HTTPS) to prevent man-in-the-middle attacks like with
|
|
Mutual PSK. It is more secure than PSK but does not need the complete roll-out process like with Mutual RSA.
|
|
|
|
We assume you have read the first part at
|
|
:doc:`how-tos/ipsec-rw`
|
|
|
|
----------------------------------------------------
|
|
Step 1 - Create Certificates (only for RSA variants)
|
|
----------------------------------------------------
|
|
|
|
For Mutual RSA + XAuth and Hybrid RSA + XAuth you need to create a Root CA and a server certificate
|
|
for your Firewall.
|
|
|
|
Go to :menuselection:`System --> Trust --> Authorities` and click **Add**. Give it a **Descriptive Name** and as **Method**
|
|
choose **Create internal Certificate Authority**. Increase the **Lifetime** and fill in the fields
|
|
matching your local values. Now go to :menuselection:`System --> Trust --> Certificates` and create a new certificate for
|
|
the Firewall itself. Important is to change the **Type** to server. The Common Name can be the hostname
|
|
of the Firewall and set as **Alternative Name** the FQDN your Firewall how it is known to the WAN side.
|
|
This is most important as your VPN will drop when the FQDN does not match the ones of the certificate.
|
|
|
|
If you already have a CA roll out a server certificate and import
|
|
the CA itself via :menuselection:`System --> Trust --> Authorities` and the certificate with the key in
|
|
:menuselection:`System --> Trust --> Certificates`.
|
|
|
|
-----------------------
|
|
Step 2 - Mobile Clients
|
|
-----------------------
|
|
First we will need to setup the mobile clients network and authentication source.
|
|
Go to :menuselection:`VPN --> IPsec --> Mobile Clients`
|
|
|
|
For our example will use the following settings:
|
|
|
|
IKE Extensions
|
|
--------------
|
|
========================== ================ =============================================
|
|
**Enable** checked *check to enable mobile clients*
|
|
**User Authentication** Local Database *For the example we use the Local Database*
|
|
**Group Authentication** none *Leave on none*
|
|
**Virtual Address Pool** 10.10.0.0/24 *Enter the IP range for the remote clients*
|
|
========================== ================ =============================================
|
|
|
|
You can select other options, but we will leave them all unchecked for this example.
|
|
|
|
**Save** your settings and select **Create Phase1** when it appears.
|
|
Then enter the Mobile Client Phase 1 setting.
|
|
|
|
-------------------------------
|
|
Step 3 - Phase 1 Mobile Clients
|
|
-------------------------------
|
|
|
|
Phase 1 General information
|
|
---------------------------
|
|
========================== ============= ==================================================
|
|
**Connection method** default *default is 'Start on traffic'*
|
|
**Key Exchange version** V1 *XAuth only works on V1*
|
|
**Internet Protocol** IPv4
|
|
**Interface** WAN *choose the interface connected to the internet*
|
|
**Description** MobileIPsec *freely chosen description*
|
|
========================== ============= ==================================================
|
|
|
|
Phase 1 proposal (Authentication)
|
|
---------------------------------
|
|
=========================== ==================== ==========================================================================
|
|
**Authentication method** XAuth *Choose one of the three available options*
|
|
**Negotiation mode** Main Mode *Use Main Mode here*
|
|
**My identifier** Distinguished Name *Set the FQDN you used within certificate, for PSK use "My IP address"*
|
|
**Pre-shared Key** Shared secret *For Mutual PSK + XAuth use this PSK, otherwise certificate below*
|
|
**My Certificate** Certificate *Choose the certificate from dropdown list, only valid for RSA variants*
|
|
=========================== ==================== ==========================================================================
|
|
|
|
Phase 1 proposal (Algorithms)
|
|
-----------------------------
|
|
========================== ================ ============================================
|
|
**Encryption algorithm** AES *For our example we will use AES/256 bits*
|
|
**Hash algoritm** SHA1, SHA256 *SHA1 and SHA256 for compatibility*
|
|
**DH key group** 1024, 2048 bit *1024 and 2048 bit for compatibility*
|
|
**Lifetime** 28800 sec *lifetime before renegotiation*
|
|
========================== ================ ============================================
|
|
|
|
Advanced Options are fine by default.
|
|
|
|
**Save** your settings.
|
|
|
|
-------------------------------
|
|
Step 3 - Phase 2 Mobile Clients
|
|
-------------------------------
|
|
Press the button that says '+ Show 0 Phase-2 entries'
|
|
|
|
.. image:: images/ipsec_s2s_vpn_p1a_show_p2.png
|
|
:width: 100%
|
|
|
|
You will see an empty list:
|
|
|
|
.. image:: images/ipsec_s2s_vpn_p1a_p2_empty.png
|
|
:width: 100%
|
|
|
|
Now press the *+* at the right of this list to add a Phase 2 entry.
|
|
|
|
General information
|
|
-------------------
|
|
================= =============== =============================
|
|
**Mode** Tunnel IPv4 *Select Tunnel mode*
|
|
**Description** MobileIPsecP2 *Freely chosen description*
|
|
================= =============== =============================
|
|
|
|
Local Network
|
|
-------------
|
|
=================== ============ ==============================
|
|
**Local Network** LAN subnet *Route the local LAN subnet*
|
|
=================== ============ ==============================
|
|
|
|
Phase 2 proposal (SA/Key Exchange)
|
|
----------------------------------
|
|
=========================== ============== ====================================================
|
|
**Protocol** ESP *Choose ESP for encryption*
|
|
**Encryption algorithms** AES / 256 *For this example we use AES 256*
|
|
**Hash algorithms** SHA1, SHA256 *Same as before, mix SHA1 and SHA256*
|
|
**PFS Key group** off *Most mobile systems do not support PFS in Phase2*
|
|
**Lifetime** 3600 sec
|
|
=========================== ============== ====================================================
|
|
|
|
**Save** your settings and **Enable IPsec**, Select:
|
|
|
|
.. image:: images/ipsec_s2s_vpn_p1a_enable.png
|
|
:width: 100%
|
|
|
|
.. Note::
|
|
|
|
If you already had IPsec enabled and added Road Warrior setup, it is important to
|
|
restart the whole service via services widget in the upper right corner of IPSec pages
|
|
or via :menuselection:`System --> Diagnostics --> Services --> Strongswan` since applying configuration only
|
|
reloads it, but a restart also loads the required modules of strongSwan.
|
|
|
|
------------------------
|
|
Step 4 - Add IPsec Users
|
|
------------------------
|
|
|
|
Go to :menuselection:`System --> Access --> Users` and press the **+** sign in the lower right corner
|
|
to add a new user.
|
|
|
|
Enter the following into the form:
|
|
|
|
=============== ==========
|
|
**User Name** expert
|
|
**Password** &test!9T
|
|
=============== ==========
|
|
|
|
**Save** to apply.
|
|
|
|
------------------------------------------------
|
|
Step 5 - Add client certificate (for Mutual RSA)
|
|
------------------------------------------------
|
|
|
|
This step is only needed for Mutual RSA + XAuth!
|
|
|
|
Go to :menuselection:`System --> Trust --> Certificates` and create a new client certificate.
|
|
Just click **Add**, choose your CA and probably increase the lifetime. Everything else besides
|
|
the CN can be left default. Give a **Common Name** and **Save**. Download the newly created
|
|
certificate as PKCS12 and export it to you enduser device.
|