IPsec OpenBSD: Difference between revisions

Latest revision as of 18:14, 19 November 2021

Overview and requirements

This has been tested using pre-shared keys between a Firebrick FB2700 and OpenBSD 5.7-RELEASE.

We had to add some workarounds to the FireBrick IPsec code to cope with some protocol negotiation issues with OpenBSD's IKEv2 implementation. We are in talks with the OpenBSD developers about which end is doing things correctly, but for the moment you will need a FireBrick with firmware version 1.36.032 or newer for this to work.

In this example, IP addresses are assigned as follows:

192.0.2.1 FireBrick FB2700
192.0.2.2 OpenBSD machine
198.51.100.0/24 LAN of machines behind FireBrick
203.0.113.0/24 LAN of machines behind OpenBSD

FireBrick configuration

   <ipsec-ike allow="192.0.2.2">
      <connection name="openbsdtest" local-ip="192.0.2.1" peer-ips="192.0.2.2" graph="openbsd ipsec" 
       routes="203.0.113.0/24" local-ID="192.0.2.1" 
       peer-ID="192.0.2.2" auth-method="Secret" secret="your PSK here"/>
   </ipsec-ike>

OpenBSD configuration

/etc/iked.conf :

ikev2 "tofirebrick" active \
        esp \
        from 203.0.113.0/24 to 198.51.100.0/24 \
        local 192.0.2.2 peer 192.0.2.1 \
        ikesa group modp2048 \
        srcid 192.0.2.2 dstid 192.0.2.1 \
        psk "your PSK here"

@@ Line 1: / Line 1: @@
-<indicator name="Tunnels">[[File:Menu-IPsec.svg|link=:Category:FireBrick_IPsec|30px|Back up to the FireBrick IPsec Tunnels Category Page]]</indicator>
+<indicator name="Tunnels">[[File:Menu-IPsec.svg|link=:Category:FireBrick IPsec|30px|Back up to the FireBrick IPsec Tunnels Category Page]]</indicator>
 == Overview and requirements ==
@@ Line 12: / Line 12: @@
 * 198.51.100.0/24 LAN of machines behind FireBrick
 * 203.0.113.0/24 LAN of machines behind OpenBSD
 == FireBrick configuration ==
+<SyntaxHighlight lang="xml">
-<code>
    <ipsec-ike allow="192.0.2.2">
       <connection name="openbsdtest" local-ip="192.0.2.1" peer-ips="192.0.2.2" graph="openbsd ipsec"
@@ Line 22: / Line 21: @@
        peer-ID="192.0.2.2" auth-method="Secret" secret="your PSK here"/>
    </ipsec-ike>
+</SyntaxHighlight>
-</code>
 == OpenBSD configuration ==
+ /etc/iked.conf :
-[[Category:FireBrick_IPsec|OpenBSD]]
+<SyntaxHighlight lang="aconf">
+ikev2 "tofirebrick" active \
+        esp \
+        from 203.0.113.0/24 to 198.51.100.0/24 \
+        local 192.0.2.2 peer 192.0.2.1 \
+        ikesa group modp2048 \
+        srcid 192.0.2.2 dstid 192.0.2.1 \
+        psk "your PSK here"
+</SyntaxHighlight>
+[[Category:FireBrick IPsec|OpenBSD]]