 | This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
|
 | |
| Developer(s) | Michał Trojnara |
|---|---|
| Initial release | 11 February 1998[1] |
| Stable release | 5.72[2] 
/ 4 February 2024 |
| Repository | www |
| Written in | C[3] |
| Operating system | Multi-platform |
| Type | Proxy, Encryption |
| License | GNU General Public License |
| Website | www |
Stunnel is an open-source multi-platform application used to provide a universal TLS/SSL tunneling service.
Stunnel is used to provide secure encrypted connections for clients or servers that do not speak TLS or SSL natively.[4] It runs on a variety of operating systems,[5] including most Unix-like operating systems and Windows. Stunnel relies on the OpenSSL library to implement the underlying TLS or SSL protocol.
Stunnel uses public-key cryptography with X.509 digital certificates to secure the SSL connection, and clients can optionally be authenticated via a certificate.[6]
If linked against libwrap, it can be configured to act as a proxy–firewall service as well.[citation needed]
Stunnel is maintained by Polish programmer Michał Trojnara and released under the terms of the GNU General Public License (GPL) with OpenSSL exception.[7]
- ^ "stunnel change log". stunnel.org. Retrieved 2 March 2024.
- ^ "stunnel change log". Retrieved 2 March 2024.
- ^ Trojnara, Michał. "stunnel sources". GitHub. Retrieved 12 May 2020.
- ^ O'Donovan, Barry (October 2004). "Secure Communication with Stunnel". Linux Gazette, Issue 107.
- ^ ""stunnel: Ports"". Archived from the original on 1 April 2019. Retrieved 24 August 2020.
- ^ "stunnel(8) manual"
- ^ "stunnel license (see COPYRIGHT.md for detailed GPL conditions)". stunnel.org. Retrieved 2 March 2024.