Re: Encrypt some services with ipsec

On Sat, 24 Sep 2005, carlopmart@gmail.com wrote:

> Hi all,
>
>   I have two prodction servers with FreeBSD 5.4 (all security patches
> are applied). They running some services like dns, ssh, http, ftp, etc.
> But I woukd like to encrypt some services for some hosts with ipsec when
> it is accessed. For example:
>
>   - DNS resolution: not encrypted.
>   - DNS replication master-slave: encrypted by ipsec.
>   - Telnet: encrypted by ipsec for some hosts. Deny for the rest.
>   - SSH: not encrypted for some hosts, encryted by ipsec for the rest.
>   - FTP: encrypted by ipsec.
>   - HTTP: encrypted by ipsec.
>
>   is it possible to encrypt only certains services under ipsec tunnel??

Someone please check my work.

>From the man page on setkey, it looks like you can specify ports for the
security policies, so you could specify certain ports to encrypt, and not
specify a blanket/default host-to-host policy for all other traffic, so
that all other unspecified traffic is unencrypted.

For example:

---------------------BEGIN /ETC/IPSEC.CONF-------------------------------
#
# encrypt all dns traffic between master host A (1.1.1.1) slave host B
# (1.1.1.2)
spadd 1.1.1.1 1.1.1.2[53] any -P out ipsec esp/transport//use;
spadd 1.1.1.2[53] 1.1.1.1 any -P in ipsec esp/transport//use;

spadd 1.1.1.1[53] 1.1.1.2 any -P out ipsec esp/transport//use;
spadd 1.1.1.2 1.1.1.1[53] any -P in ipsec esp/transport//use;

#
# encrypt telnet traffic between server A (1.1.1.1) and client C (1.1.1.3)
spadd 1.1.1.1[23] 1.1.1.3 any -P out ipsec esp/transport//use;
spadd 1.1.1.3 1.1.1.1[23] any -P in ipsec esp/transport//use;

#
# encrypt http traffic between server A (1.1.1.1) and client D (1.1.1.4)
spadd 1.1.1.1[80] 1.1.1.4 any -P out ipsec esp/transport//use;
spadd 1.1.1.4 1.1.1.1[80] any -P in ipsec esp/transport//use;

#
# and all other traffic is unencrypted.
---------------------END /ETC/IPSEC.CONF-------------------------------

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