Libreswan
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Version
SME8
SME9
About
Openswan is a free implementation of IPsec& IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks. Everything passing through the untrusted net is encrypted by the ipsec gateway machine and decrypted by the gateway at the other end of the tunnel.The resulting tunnel is a virtual private network or VPN.
Libreswan is a free software implementation of the most widely supported and standarized VPN protocol based on ("IPsec") and the Internet Key Exchange ("IKE"). These standards are produced and maintained by the Internet Engineering Task Force ("IETF").
Note that Libreswan will become the default ipsec installation from CentOS 6.8
https://libreswan.org/wiki/HOWTO:_openswan_to_libreswan_migration
- Credits: John Crisp
- Discuss: This How-to can be discussed on the forums here
For v9 you can simply install as follows
yum --enablerepo=smecontribs,epel install smeserver-libreswan
Configuration options and notes are here (check the latest branch):
https://github.com/reetp/smeserver-libreswan
For v8 you will additionally need the ReetP repo to install openswan
yum --enablerepo=smecontribs,epel,reetp install smeserver-openswan
Configuration options and notes are here (check the latest branch):
Installation
For SME Server 8, at least openswan-2.6.38-1.x86_64.rpm is required. However, this version is not to be found in the default repo's, nor any of the additional repo's. A trusted copy of Openswan for SME8 can be found here. (This is only for 64bit systems!)
After you have downloaded the above file, you can install it by issuing the following command:
yum localinstall openswan-2.6.38-1.x86_64.rpm
For SME Server 9, the Openswan can be found in the default repo's, so to install Openswan on SME Server 9, simply enter the following command:
yum install openswan
IPSEC server to server configuration
Openswan/IPSEC can be used to setup a secue and permanent VPN connection between a SME Server and another (local or remote) IPSEC enabled device such as a router.
Here is an example:
Note - if you want to use with an online VPS set the server to server/gateway with a 'dummy' internal network adaptor.
Passwords
It is recommended to create a very strong random password and keep this safe. One way of generating and store a random strong password is explained here
Setting
The contrib has a lot of configurable settings but with the defaults and few details it should just work
config setprop ipsec status enabled access public
Note for ipsec_connections we use 'set' when we create new connection. Thereafter you can modify it with setprop
Local - WAN IP 5.6.7.8 Local IP 192.168.20.1 Subnet 192.168.20.0/24
db ipsec_connections set MyEast ipsec status enabled leftsourceip 192.168.20.1 leftsubnet 192.168.20.0/24 right 1.2.3.4 rightsubnet 10.0.0.0/24 passwd MyPassWd
Remote - WAN IP 1.2.3.4 Local IP 10.0.0.1 Subnet 10.0.0.0/24
db ipsec_connections set MyWest ipsec status enabled leftsourceip 10.0.0.1 leftsubnet 10.0.0.0/24 right 5.6.7.8 rightsubnet 192.168.20.0/24 passwd MyPassWd
signal-event ipsec-update
Check /var/log/pluto/pluto.log
ipsec whack --status ipsec verify (may be some warnings - severity depends on what they are)
For the better security it is recommended to use RSA keys. There is more on this on the github page https://github.com/reetp/smeserver-libreswan/blob/master/IpsecSettings.txt
If you modify a connection use
signal-event ipsec-update
For a restart of ipsec use
service ipsec restart
Verifying configuration
To verify your configuration give the following command:
ipsec verify
A reboot should get everything going.
Now set up your router.
Create a new IPSEC VPN connection with the correct credentials and it should connect up.
Check /var/log/secure for debug messages, and once you are happy, change the debug settings in ipsec.conf from debug to warning.
If you need more debugging you can set plutodebug = all
Bug report
SME8 OpenSwan IPSEC is listed in the bugtracker contribs section. Please report all bugs, new feature requests and documentation issues there.
SME9 LibreSwan IPSEC is listed in the bugtracker contribs section. Please report all bugs, new feature requests and documentation issues there.
| ID | Product | Version | Status | Summary (4 tasks) ⇒ |
|---|---|---|---|---|
| 12109 | SME Contribs | 10.0 | CONFIRMED | NFR reuse existing entries in manager code |
| 11405 | SME Contribs | 10beta | RESOLVED | Initial Import in SME 10 [smeserver-libreswan] |
| 10661 | SME Contribs | 9.2 | CONFIRMED | New file to adjust redirects in /etc/sysctl.d |
| 9305 | SME Contribs | 9.1 | CONFIRMED | Trouble configuring kernel settings for ipsec contrib |
Other articles in this category
Ipsec, Libreswan, Libreswan-xl2tpd, OpenVPN, OpenVPN Bridge, OpenVPN Bridge/fr, OpenVPN Routed, OpenVPN SiteToSite, SME Server wishlist, SoftEther VPN, Softethervpn-server, VPN, Wireguard