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. For Windows configuration details see http://support.microsoft.com/kb/949856/.

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

The following command sets the IKEv1 Main Mode algorithms:

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

The currently configured algorithms can be checked using the command:

netsh advfirewall show global

Main Mode:
KeyLifetime  480min,0sess
SecMethods   ECDHP256-AES128-SHA256,ECDHP384-AES192-SHA384,DHGroup14-AES128-SHA1
ForceDH      No

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

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

The current rule settings are shown with the following command:

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.

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

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

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:

and the established Quick Mode:

And here the resulting status output on the Linux side:

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