strongSwan

h1. Windows Suite B Support with IKEv1

Windows Vista Service Pack 1, Windows Server 2008 and Windows 7 support the Suite B cryptographic algorithms for IPsec defined by "RFC 4869":http://tools.ietf.org/html/rfc4869. For Windows configuration details see http://support.microsoft.com/kb/949856/.

First we create a new "VPN Suite B" security rule:

!advfirewall_security_rules.png!

The following command sets the IKEv1 Main Mode algorithms:

<pre>

netsh advfirewall set global mainmode mmsecmethods ecdhp256:aes128-sha256,ecdhp384:aes192-sha384,dhgroup14:aes128-sha1

</pre>

The currently configured algorithms can be checked using the command:

<pre>

netsh advfirewall show global

Main Mode:

KeyLifetime  480min,0sess

SecMethods   ECDHP256-AES128-SHA256,ECDHP384-AES192-SHA384,DHGroup14-AES128-SHA1

ForceDH      No

</pre>

The following command sets the IKEv1 Quick Mode algorithms in the rule "VPN Suite B":

<pre>

netsh advfirewall consec set rule name="VPN Suite B" new qmsecmethods=esp:aesgcm128-aesgcm128,esp:aesgcm192-aesgcm192,esp:aesgcm256-aesgcm256

</pre>

The current rule settings are shown with the following command:

<pre>

netsh advfirewall consec show rule name="VPN Suite B"

Rule Name:                            VPN Suite B

----------------------------------------------------------------------

Enabled:                              Yes

Profiles:                             Domain,Private,Public

Type:                                 Static

Mode:                                 Tunnel

LocalTunnelEndpoint:                  10.10.0.6

RemoteTunnelEndpoint:                 10.10.0.1

Endpoint1:                            10.10.0.6/32

Endpoint2:                            10.10.1.0/24

Protocol:                             Any

Action:                               RequireInRequireOut

Auth1:                                ComputerCertECDSAP256

Auth1ECDSAP256CAName:                 C=CH, O=strongSec GmbH, CN=strongSec 2007 CA

Auth1ECDSAP256CertMapping:            No

Auth1ECDSAP256ExcludeCAName:          No

Auth1ECDSAP256CertType:               Root

Auth1ECDSAP256HealthCert:             No

MainModeSecMethods:                   ECDHP256-AES128-SHA256,ECDHP384-AES192-SHA384,DHGroup14-AES128-SHA1

QuickModeSecMethods:                  ESP:AESGCM128-AESGCM128+60min+100000kb,ESP:AESGCM192-AESGCM192+60min+100000kb,ESP:AESGCM256-AESGCM256+60min+100000kb

ExemptIPsecProtectedConnections:      No

ApplyAuthorization:                   No

Ok.

</pre>

On the strongSwan side the following entries are required in ipsec.conf for 128 bit security:

<pre>

conn suiteB

     left=10.10.0.1

     leftcert=koala_ecCert.pem

     leftid=@koala.strongsec.com

     leftsubnet=10.10.1.0/24

     leftfirewall=yes

     lefthostaccess=yes

     right=10.10.0.6

     rightid="C=CH, O=strongSec GmbH, OU=ECDSA-256, CN=bonsai.strongsec.com"

     rightca=%same

     keyexchange=ikev1

     ike=aes128-sha256-ecp256!

     esp=aes128gcm16!

     pfs=no

     dpdaction=clear

     dpddelay=300s

     rekey=no

     auto=add

</pre>

Pinging host 10.10.1.11 from the Windows 7 host triggers the IKEv1 tunnel setup.

The following Windows status information is available for the Main Mode:

!advfirewall_main_mode_128.png!

and the established Quick Mode:

!advfirewall_quick_mode_128.png!

And here the resulting status output on the Linux side:

<pre>

root@koala:~# ipsec statusall suiteB

Status of IKEv1 pluto daemon (strongSwan 4.3.3):

loaded plugins: curl test-vectors aes des sha1 sha2 md5 gmp openssl pubkey random hmac 

debug options: control

"suiteB": 10.10.1.0/24===10.10.0.1[@koala.strongsec.com]...10.10.0.6[C=CH, O=strongSec GmbH, OU=ECDSA-256, CN=bonsai.strongsec.com]; erouted; eroute owner: !#21

"suiteB":   CAs: 'C=CH, O=strongSec GmbH, CN=strongSec 2007 CA'...'C=CH, O=strongSec GmbH, CN=strongSec 2007 CA'

"suiteB":   ike_life: 10800s; ipsec_life: 3600s; rekey_margin: 540s; rekey_fuzz: 100%; keyingtries: 3

"suiteB":   dpd_action: clear; dpd_delay: 300s; dpd_timeout: 150s;

"suiteB":   policy: PUBKEY+ENCRYPT+TUNNEL+DONTREKEY; prio: 24,32; interface: eth1; 

"suiteB":   newest ISAKMP SA: !#20; newest IPsec SA: !#21; 

"suiteB":   IKE proposal: AES_CBC_128/HMAC_SHA2_256/ECP_256

"suiteB":   ESP proposal: AES_GCM_16_128/AUTH_NONE/<N/A>

!#21: "suiteB" STATE_QUICK_R2 (IPsec SA established); EVENT_SA_EXPIRE in 3580s; newest IPSEC; eroute owner

!#21: "suiteB" esp.671c2d71@10.10.0.6 (180 bytes, 14s ago) esp.9f12330a@10.10.0.1 (240 bytes, 14s ago); tunnel

!#20: "suiteB" STATE_MAIN_R3 (sent MR3, ISAKMP SA established); EVENT_SA_EXPIRE in 28780s; newest ISAKMP

</pre>