Stunnel is a program that allows you to encrypt arbitrary TCP
connections inside SSL (Secure Sockets Layer).
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 does not contain any crytographic code itself --
instead it relies on external SSL libraries.
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- Being an SSL client
- Being an SSL server
- Server and client side certificate verification
- TCP wrapper support
- IDENT lookups
- SMTP protocol negotiation
- Source address rewriting (transparency) (where supported by
- Restricting allowed SSL ciphers
Last Updated Monday, September 09 2013 @ 09:08 AM EDT