I have to figure out how to get some ssl encapsulation for an application we have that only servs on obscure ports, the app needs to retain the source ip adress of the client requests. So i looked at stunnel, its working great in transparent mode where the stunnel server is the default gateway of the socket server, but I would like to get the stunnel server onto the same machine as the socket server and keep the client src ip. Testing with a apache as a backend as its easy to test.

running centos 6.3 (2.6.32-279.19.1.el6.x86_64), updated an hour ago, built stunnel 4.54 from src.rpm.

The players

stunnel-boxen external=192.168.0.1, internal=192.168.1.1

web/socket-boxen internal=192.168.1.11, dg=192.168.1.1

The configs

Config A - works ok

debug = 7
foreground = yes

#not chrooted runnnig as root no setuid,setguid

[socket-1234]
cert=blarg.crt
key=blarg.key
accept = 192.168.0.1:1234
connect = 192.168.1.11:80
transparent = source

Config B - Not so good

connect = 192.168.1.1:80 <- inside interface of stunnel box

iptables -t mangle -N DIVERT
iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
iptables -t mangle -A DIVERT -j MARK --set-mark 1
iptables -t mangle -A DIVERT -j ACCEPT
ip rule add fwmark 1 lookup 100
ip route add local 0.0.0.0/0 dev lo table 100

/etc/sysctl.conf

no route filtering and forwarding is on

am i trying something impossible? or am i missing something?

Any help greatly appreciated, if I get this going I'll happily do a nice neater write up for others.

Cheers

Alex