Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows. Stunnel can allow you to secure non-SSL aware daemons and protocols (like POP, IMAP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon's code.

Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows. Stunnel can allow you to secure non-SSL aware daemons and protocols (like POP, IMAP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon's code.

The Stunnel source code is not a complete product -- you still require a functioning SSL library such as OpenSSL or SSLeay in order to compile stunnel. This means that stunnel can support whatever (and only) that which your SSL library can, without making any changes in the Stunnel code.

The Stunnel source code is available under the GNU General Public License, meaning it is free to use in both commercial and non commercial applications as you see fit, as long as you provide source code (and any modifications) with the software. Your compiled Stunnel binary is 'restricted' by whatever license your chosen SSL library is under, however both OpenSSL and SSLeay are open source and similarly liberal in their licensing.

New Release
Security bugfixes:
The "redirect" option was fixed to properly handle unauthenticated requests (thx to Martin Stein).
Fixed a double free with OpenSSL older than 1.1.0 (thx to Petr Strukov).
OpenSSL DLLs updated to version 1.1.1j.
New features:
New 'protocolHeader' service-level option to insert custom 'connect' protocol negotiation headers. This feature can be used to impersonate other software (e.g. web browsers).
'protocolHost' can also be used to control the client SMTP protocol negotiation HELO/EHLO value.
Initial FIPS 3.0 support.
Bugfixes:
X.509v3 extensions required by modern versions of OpenSSL are added to generated self-signed test certificates.
Fixed a tiny memory leak in configuration file reload error handling (thx to Richard Könning).
Merged Debian 05-typos.patch (thx to Peter Pentchev).
Merged with minor changes Debian 06-hup-separate.patch (thx to Peter Pentchev).
Merged Debian 07-imap-capabilities.patch (thx to Ansgar).
[ Stunnel release history ]

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