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ipsec client with PSK - need some help
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E-Razor
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Joined: 11 Jul 2004
Posts: 51

PostPosted: Fri Jan 11, 2013 4:43 pm    Post subject: ipsec client with PSK - need some help Reply with quote

Hi all,

I'm getting grey hairs right now cos of ipsec :-(

I tried to setup an ipsec-client with PSK and these data:
Server-IP: <server_ip>
my-IP: <my_ip>
Phase 1
Encryption Algorithm: 3 DES
Hash Algorithm: MD5
Authentication Method: Pre-shared
Diffie-Hellman group: D-H group 2
Security Association's lifetime: 86400 seconds
Phase 2
ESP Encryption Transform: ESP-3DES
ESP Authentication Transform: ESP-MD5-HMAC

My net: <my_net> = 0.0.0.0/0
server net: <server_net> = 192.168.1.0/24


I found some howtos but somehow I wasn't able to get any of them to work.

Some are using racoon some are using openswan.

I tried the one mentioned at the gentoo wiki with racoon. I think I've configured everything correctly, the only part which was strange for me are the random keys in /etc/ipsec.conf .
Do I need these?

After starting racoon (/etc/init.d/racoon start) I tried to ping a host from <server_net> which does not work.


I'd be very grateful if someone could give me some hints or points me to another good HowTo.

Thanks!
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E-Razor
n00b
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Joined: 11 Jul 2004
Posts: 51

PostPosted: Tue Jan 15, 2013 5:02 pm    Post subject: ...solved Reply with quote

Took me a while but now I got it.

The howto at http://www.ipsec-howto.org/x304.html helped me a lot.

For the client part I'm using racoon which manages most of the ipsec stuff.

The setup is pretty easy:
Code:

#/etc/racoon/racoon.conf

path pre_shared_key "/etc/racoon/psk.txt";

remote <server_ip> {
   exchange_mode main,aggressive;
   proposal {
      encryption_algorithm 3des;
      hash_algorithm md5;
      authentication_method pre_shared_key;
      dh_group 2;
   }
}

sainfo address <my_net> any address <server_net> any {
   pfs_group 2;
   encryption_algorithm 3des;
   authentication_algorithm hmac_md5;
   compression_algorithm deflate;
}



The first issue was that I permuted <my_net> and <server_net> .

You need to set up the psk:
Code:

#/etc/racoon/psk.txt
<server_ip> <psk>


Then you need to configure the /etc/ipsec.conf like this:
Code:

#!/usr/sbin/setkey -f
#
# Flush SAD and SPD
flush;
spdflush;

# Create policies for racoon
spdadd <my_net> <server_net> any -P out ipsec
           esp/tunnel/<my_ip>-<server_ip>/require;

spdadd <server_net> <my_net> any -P in ipsec
           esp/tunnel/<server_ip>-<my_ip>/require;



Restart racoon:
# /etc/init.d/racoon restart

Connect:
# racoonctl vpn-connect <server_ip>

Then you can simply ping anyone from <server_net>.

There is no additional network interface or route, the kernel does everything on it's own - pretty confusing for me.
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