Posts Tagged ‘PKI’

Stoke is quite a cool company when it comes to VPN gateways, and I mention here the SSX-3000, the only device I had the pleasure of working with. I could see on their website that new investments are made in LTE technologies, which should make this company even more attractive for me.

Well, this post is going to be about a specific thinggie of the SSX-3000 and StokeOS, that funky colored box, namely how they work with digital certificates. The scenario I am using them on is a classic Remote-Access scenario, for IKEv2. The StokeOS gateway is getting authenticated by the roadwarrior via digital certificate, while the roadwarrior authenticates via EAP.

First of all, we need digital certificates for the StokeOS. Following the User Guide got me nowhere, so we had to be inventive 😀

A. The official version

1. Create a CSR on the Stoke:

Stoke[local]#certificate request new name newcsr.pem days 100 keylength 1024

2. Copy – paste the content of the CSR (or copy the file onto an ftp/tftp server), then generate a certificate using a CA (I had a Windows 2003 Server) => results a signed certificate – I used to download them in base64 format

3. Copy – paste the CA’s certificate and the Stoke’s certificate we’ve just signed onto Stoke and run the command:

Stoke[local]#certificate device-certificate new ca-certfile cacert.pem format pemcertfile signed-ssx-ca.pem format pem name mypkcs12

— This command should “link” the CA, the signed certificate and the Stoke’s private RSA key to a PKCS12 file that this device uses for authentication. This is how Stoke authenticates 🙂

*** PROBLEM: when generating the CSR, the private key doesn’t get saved anywhere. I have looked everywhere:  ” -r” : /hd/…, /cfint, /cfext… – so, the latest mightiest command is not working.

B.  The working version

1. Do not create the CSR on the DUT 😛

2. Generate a “Server Certificate” from IE and download it to a tftp/ftp server – it will be in pfx format

3. Export the private key to a separate key file – I have used openssl

4. Upload the CA’s certificate, signed certificate and the private key file on SSX and run the command (assuming I have put these files on /hd/Certs directory):

Stoke[local]#certificate device-certificate new name SSX format pem ca-certfile /hd/Certs/cacert.pem format pem signed-certificate /hd/Certs/signed-ssx-ca.pem format pem private-key /hd/Certs/signed-ssx-ca-key.pem

and now it works 🙂

as you can see from

Stoke[local]#sh certificate device-certificate all

Certificate Name

————————

SSX

Further on, create a context – I have called it test and a name for the radius session – I have called it ikev2, instruct the Stoke to do session authentication on radius, create a management interface on the same subnet as the radius machine, configure a radius server (where the Stoke should connect for session authentication) and, of course, the IKEv2 policies that make it work and the Configuration Payload (as we like to call the famous “mode-configuration” in IKEv2). The config should look like this:

stoke

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Recently I’ve had the opportunity of playing a bit with a CheckPoint UTM NGX R65 – ze mighty solution from the CheckPoint guys. Ignoring the obvious impediments (Romanian posts) I had when configuring the device from GUI, it left me a nice impression.

These guys are not quite the interop gurus ever, but they strive to implement the crankiest drafts that ever appeared from IETF. Running this on my own, the interop even with this device worked well, but trying to make it work with StrongswanI’ve got into big trouble.

Why? Well, let’s take a look at the most common IPsec – IKEv1 implementations. They usually pick one/more of the following standards:

– RFC 2407

– RFC 2408

– RFC 2409

– RFC 3706 – should you like DPD – Dead Peer Detection

– RFC 3947 and RFC 3948 for NAT-T

mode-cfg-02 draft – for the most common Mode-Configuration operations (perfectly inter-operable by Cisco, Juniper’s ScreenOS, Strongswan, Sonicwall, Stoke and Clavister) – as you may have guessed, NO, NOT with CheckPoint

draft-beaulieu-ike-xauth-02 – for xAuth authentication of clients – inter-operable on Cisco, NetScreen, Stoke and Sonicwall (not sure about Clavister – haven’t tried it yet) – and, yes, not on CheckPoint

As a nice old guy would say: “Security through obscurity” , not quite my favorite idea of _security_. Still, a good to follow idea for CheckPoint. Why? Because, even though they implement the RFC 2407, 2408 and 2409, they have decided not to implement the most common xAuth draft (presented above), feeling that symmetrical authentication is just too lame, so they have implemented draft-zegman-ike-hybrid-auth-01, which defines how to do uni-directional independent authentication on the remote-access scenarios – procedure enforced by the CheckPoint VPN Client (only, if you ask me, though I haven’t tried too many others).

Once you bypass this authentication procedure, configuring the UTM to authenticate the clients using X.509 certificates, you end up in yet another dead-end: the so-called Office-Mode, which is the CheckPoint way of saying “Mode-Configuration”, with a significant difference: the actual packet exchange is not standard. We have tried, me and my programmer fellows (by the way: thanks for enduring this by my side), to “reverse-engineer” this mighty exchange, but even with the CheckPoint debug and hacking into our friend pluto, we didn’t manage to get it right.

I have talked to a tech-support guy from CKP, a very nice person, still incapable of saying anything about their solution without first asking for permission from his PM/Management/whatever. So, up until today, I haven’t been able to pull this through. This is why the things I’m going to describe below are only ALMOST CheckPoint IPsec…

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