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Stunnel

The stunnel is an open-source multi-platform computer program, used to provide universal TLS/SSL tunneling service.

The stunnel can be used to provide secure encrypted connections for clients or servers that do not speak or natively. It runs on a variety of operating systems, including most Unix-like operating systems and Windows. Stunnel relies on a separate library, such as OpenSSL or SSLeay, to implement the underlying TLS or SSL protocol.

The stunnel uses public-key cryptography with X.509 digital certificates to secure the SSL connection. Clients can optionally be authenticated via a certificate too.

If linked against libwrap, it can be configured to act as a proxy- firewall service as well.

The stunnel is maintained by MichaƂ Trojnara. Released under the terms of the GNU General Public License (GPL) with OpenSSL exception.