Stunnel

Stunnel is a free multi-platform computer program, used to provide universal TLS/SSL tunnelling service.

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

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.

Stunnel is maintained by Michal Trojnara and Brian Hatch. Released under the terms of the GNU General Public License.

Links

• http://www.stunnel.org/
• http://stunnel.mirt.net/