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Stunnel is a free multi-platform computer program, used to provide universal TLS/SSL tunnelling service. “Software development†redirects here. ...
Code complete redirects here. ...
is the 300th day of the year (301st in leap years) in the Gregorian calendar. ...
Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ...
An operating system (OS) is the software that manages the sharing of the resources of a computer and provides programmers with an interface used to access those resources. ...
Computer software can be organized into categories based on common function, type, or field of use. ...
In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. ...
Encrypt redirects here. ...
A software license is a legal agreement which may take the form of a proprietary or gratuitous license as well as a memorandum of contract between a producer and a user of computer software. ...
GPL redirects here. ...
A website (alternatively, Web site or web site) is a collection of Web pages, images, videos or other digital assets that is hosted on one or several Web server(s), usually accessible via the Internet, cell phone or a LAN. A Web page is a document, typically written in HTML...
Free software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions only to ensure that further recipients can also do these things. ...
A computer program is a collection of instructions that describe a task, or set of tasks, to be carried out by a computer. ...
Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide secure communications on the Internet for such things as web browsing, e-mail, Internet faxing, instant messaging and other data transfers. ...
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. Diagram of the relationships between several Unix-like systems A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ...
Windows redirects here. ...
Illustration of an application which may use libvorbisfile. ...
OpenSSL is an open source implementation of the SSL and TLS protocols. ...
OpenSSL is an open source implementation of the SSL and TLS protocols. ...
Stunnel uses Public-key cryptography with X.509 digital certificates to secure the SSL connection. Clients can optionally be authenticated via a certificate too. In cryptography, X.509 is an ITU-T standard for public key infrastructure (PKI). ...
In cryptography, a public key certificate (or identity certificate) is an electronic document which incorporates a digital signature to bind together a public key with an identity — information such as the name of a person or an organization, their address, and so forth. ...
If linked against libwrap, it can be configured to act as a proxy-firewall service as well. Figure of the linking process, where object files and static libraries are assembled into a new library or executable. ...
TCP Wrapper is a host-based Networking ACL system, used to filter network access to Internet Protocol servers on (Unix-like) operating systems such as Linux or BSD. It allows host or subnetwork IP addresses, names and/or ident query replies, to be used as tokens on which to filter...
In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. ...
This article is about the network security device. ...
Stunnel is maintained by Michal Trojnara and Brian Hatch. Released under the terms of the GNU General Public License. GPL redirects here. ...
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. It has been suggested that this article or section be merged into Computer port (software). ...
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 to the unsecured mail application, however both machines would typically be behind a firewall on a secure internal network. Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide secure communications on the Internet for such things as web browsing, e-mail, Internet faxing, instant messaging and other data transfers. ...
Simple Mail Transfer Protocol (SMTP) is the de facto standard for email transmission across the Internet. ...
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