openssh  8.0p1
About: The Unix port of OpenBSD’s OpenSSH (Secure Shell) is a suite of encrypting connectivity tools (replacing programs like telnet, rlogin, rcp and ftp ). Additionally OpenSSH provides secure tunneling capabilities and several authentication methods.
  Fossies Dox: openssh-8.0p1.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

Some Fossies usage hints in advance:

  1. To see the Doxygen generated documentation please click on one of the items in the "quick index" bar above or use the side panel at the left which displays a hierarchical tree-like index structure and is adjustable in width.
  2. If you want to search for something by keyword rather than browse for it you can use the client side search facility (using Javascript and DHTML) that provides live searching, i.e. the search results are presented and adapted as you type in the Search input field at the top right.
  3. Doxygen doesn't incorporate all member files but just a definable subset (basically the main project source code files that are written in a supported language). So to search and browse all member files you may visit the Fossies openssh-8.0p1.tar.gz contents page and use the Fossies standard member browsing features (also with source code highlighting and additionally with optional code folding).
Portable OpenSSH

OpenSSH is a complete implementation of the SSH protocol (version 2) for secure remote login, command execution and file transfer. It includes a client ssh and server sshd, file transfer utilities scp and sftp as well as tools for key generation (ssh-keygen), run-time key storage (ssh-agent) and a number of supporting programs.

This is a port of OpenBSD's OpenSSH to most Unix-like operating systems, including Linux, OS X and Cygwin. Portable OpenSSH polyfills OpenBSD APIs that are not available elsewhere, adds sshd sandboxing for more operating systems and includes support for OS-native authentication and auditing (e.g. using PAM).

The official documentation for OpenSSH are the man pages for each tool:

Stable release tarballs are available from a number of download mirrors. We recommend the use of a stable release for most users. Please read the release notes for details of recent changes and potential incompatibilities.

Portable OpenSSH is built using autoconf and make. It requires a working C compiler, standard library and headers, as well as zlib and libcrypto from either LibreSSL or OpenSSL to build. Certain platforms and build-time options may require additional dependencies.

Releases include a pre-built copy of the configure script and may be built using:

tar zxvf openssh-X.Y.tar.gz
cd openssh
./configure # [options]
make && make tests

See the Build-time Customisation section below for configure options. If you plan on installing OpenSSH to your system, then you will usually want to specify destination paths.

If building from git, you'll need autoconf installed to build the configure script. The following commands will check out and build portable OpenSSH from git:

git clone # or
cd openssh-portable
make && make tests

There are many build-time customisation options available. All Autoconf destination path flags (e.g. --prefix) are supported (and are usually required if you want to install OpenSSH).

For a full list of available flags, run configure --help but a few of the more frequently-used ones are described below. Some of these flags will require additional libraries and/or headers be installed.

Flag Meaning
--with-pam Enable PAM support. OpenPAM, Linux PAM and Solaris PAM are supported.
--with-libedit Enable libedit support for sftp.
--with-kerberos5 Enable Kerberos/GSSAPI support. Both Heimdal and MIT Kerberos implementations are supported.
--with-selinux Enable SELinux support.

Portable OpenSSH development is discussed on the openssh-unix-dev mailing list (archive mirror). Bugs and feature requests are tracked on our Bugzilla.

Non-security bugs may be reported to the developers via Bugzilla or via the mailing list above. Security bugs should be reported to