Stunnel
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (February 2011) |
| Developer(s) | Michał Trojnara |
|---|---|
| Stable release | 4.34[1]
/ September 19, 2010 |
| Operating system | Multi-platform |
| Type | Proxy, Encryption |
| License | GNU General Public License |
| Website | www.stunnel.org |
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 Michał Trojnara. Released under the terms of the GNU General Public License.
Example scenario
The application can present an external secure SSL port that is mapped to an internal unsecured TCP or UDP port of an existing application.
For example, to provide a secure SSL connection to an existing SMTP mail server, Stunnel might map the SSL port 465 to port 25 of the mail server. Network traffic from clients connecting to the mail server on port 465 would initially pass over SSL to the Stunnel application, which would then transparently forward unsecured traffic to port 25 of the mail server. The Stunnel process could be running on the same or a different server from the unsecured mail application; however, both machines would typically be behind a firewall on a secure internal network.
References
External links
 | This network-related software article is a stub. You can help Wikipedia by expanding it. |