Hello,
Provided that you are using SMPP over TCP/IP (not over X25), yes you could use stunnel.
Next you have to know what port(s) are involved at the server side (ie the "listening" socket(s)):
apparently there are two flavors of smpp over tcp: one using two network connections, the other using only one ("tranceiver session").

Things will be more simple if you are using only one connection.
If you are using two connections, and provided that ssl is required on both, just duplicate [smpp] section below as [smpp1] and [smpp2],
of course changing the "accept" and "connect" ports.

Then you have to get a valid CLIENT certificate (crt file) and key file.

Stunnel.conf can then look like this :
;------
; stunnel CLIENT conf

[smpps]
client = yes

accept=127.0.0.1:CHOOSE A LOCAL LISTENING PORT ON THE CLIENT
connect=SERVER_IP_ADDR:SERVER_LISTENING_PORT

cert=\localLocation\userXXXcert.crt
key =\localLocation\userXXXcert.key

;often useful :
sslVersion=all
;-----------

And of course you have to redirect your smpp client software to the "pseudo smpp over ssl" local server(s) on localhost,
(cf "local listening port" above).

Hope this may help,
Pierre Delaage

Le 10/09/2010 19:51, Pathak, Apurva (Apu) a écrit :

Hello,

I would like to find out if I can use STunnel as follows:

I have a stand alone C# executable program that uses a third party SDK that implements SMPP protocol and sends SMS text messages with wireless carriers. Recently, one of the wireless carriers wants us to implement SSL Client Authentication and wants SMPP messages that are exchanged with them to be encrypted after the client authentication is done.

I want to find out if I can use STunnel running so that STunnel can encrypt and decrypt the messages exchanged between my program and the carrier’s SMS server.

(1) Is this possible with STunnel?

(2) What are the steps involved?

I am on the Windows Server 2003 platform.

I would really appreciate a reply.

Thanks,

Apu
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