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Stunnel
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{{multiple issues|{{primary sources|date=January 2024}}{{more citations needed|date=January 2024}}}} {{short description|Free software TLS/SSL tunneling implementation}} {{Use dmy dates|date=July 2019}} {{Infobox software | name = stunnel | logo = Stunnel logo.png | developer = Michał Trojnara | released = {{Start date and age|1998|02|11|df=yes}}<ref>{{Cite web |title=stunnel change log|url=https://www.stunnel.org/NEWS.html |access-date=2024-03-02 |website=stunnel.org |language=en}}</ref> | latest release version = {{wikidata|property|preferred|references|edit|P348|P548=Q2804309}} | latest release date = {{Start date and age|{{wikidata|qualifier|preferred|single|P348|P548=Q2804309|P577}}|df=yes}} | repo = {{URL|https://www.stunnel.org/downloads.html}} | programming language = C<ref>{{cite web|url=https://github.com/mtrojnar/stunnel/tree/master/src|title=stunnel sources|last=Trojnara|first=Michał|website=GitHub|access-date=12 May 2020}}</ref> | operating system = Multi-platform | genre = [[Proxy server|Proxy]], [[Encryption]] | license = [[GNU General Public License]] | website = {{Official URL}} }} '''Stunnel''' is an [[open-source software|open-source]] multi-platform [[application software|application]] used to provide a universal [[Transport Layer Security|TLS/SSL]] [[Tunneling protocol|tunneling]] service. Stunnel is used to provide secure encrypted connections for clients or servers that do not speak TLS or SSL natively.<ref>O'Donovan, Barry (October 2004). [http://linuxgazette.net/107/odonovan.html "Secure Communication with Stunnel"]. ''[[Linux Gazette]]'', Issue 107.</ref> It runs on a variety of operating systems,<ref>{{Cite web |url=https://www.stunnel.org/PORTS.html |title="stunnel: Ports" |access-date=24 August 2020 |archive-date=1 April 2019 |archive-url=https://web.archive.org/web/20190401195456/http://www.stunnel.org/ports.html |url-status=dead }}</ref> including most [[Unix-like]] operating systems and [[Microsoft Windows|Windows]]. Stunnel relies on the [[OpenSSL]] [[Library (computing)|library]] to implement the underlying TLS or SSL protocol. Stunnel uses [[public-key cryptography]] with [[X.509]] [[Public key certificate|digital certificates]] to secure the SSL connection, and clients can optionally be authenticated via a certificate.<ref>[https://www.stunnel.org/static/stunnel.html "stunnel(8) manual"]</ref> If [[Linker (computing)|linked]] against [[TCP Wrapper|libwrap]], it can be configured to act as a [[proxy server|proxy]]–[[firewall (networking)|firewall]] service as well.{{Citation needed|date=October 2023}} Stunnel is maintained by Polish programmer Michał Trojnara and released under the terms of the [[GNU General Public License]] (GPL) with [[OpenSSL]] exception.<ref>{{Cite web |title=stunnel license (see COPYRIGHT.md for detailed GPL conditions) |url=https://www.stunnel.org/COPYING.html |access-date=2024-03-02 |website=stunnel.org |language=en}}</ref>
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