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An SSH authentication agent for Cygwin/MSYS to PuTTY's Pageant.
| Date | Stars |
|---|---|
| 2026-07-31 | 363 |
| 2026-08-06 | 363 |
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# ssh-pageant
_An SSH authentication agent for Cygwin/MSYS that links OpenSSH to PuTTY's Pageant._
ssh-pageant is a tiny tool for Windows that allows you to use SSH keys from
[PuTTY]'s Pageant in [Cygwin] and [MSYS] shell environments.
You can use ssh-pageant to automate SSH connections from those shells, which
is useful for services built on top of SSH, like SFTP file transfers or pushing
to secure git repositories.
`ssh-pageant` works like `ssh-agent`, except that it leaves the key storage to
PuTTY's Pageant. It sets up an authentication socket and prints the environment
variables, which allows OpenSSH connections to use it.
## Installation
You can install the latest release of `ssh-pageant` for Cygwin using the
standard `setup.exe` program. For MSYS2, just run `pacman -S ssh-pageant`.
Otherwise, you can use the readily-available [binary releases]:
1. Download the pre-built [32-bit] or [64-bit] release for Cygwin, or
the [32-bit][32-bit-msys] release for MSYS.
2. Just copy the exe into your PATH and ensure it is executable:
$ cp ssh-pageant.exe /usr/bin/
$ chmod 755 /usr/bin/ssh-pageant.exe
3. Optionally, copy the manpage as well:
$ cp ssh-pageant.1 /usr/share/man/man1/
The `INSTALL` file describes how to build and install `ssh-pageant` from source.
## Usage
1. Ensure that PuTTY's Pageant is running (and holds your SSH keys).
* ssh-pageant does not start Pageant itself.
* Recommended: Add Pageant to your Windows startup/Autostart configuration
so it is always available.
2. Edit your `~/.bashrc` (or `~/.bash_profile`) to add the following:
# ssh-pageant
eval $(/usr/bin/ssh-pageant -r -a "/tmp/.ssh-pageant-$USERNAME")
To explain:
* This leverages the `-r`/`--reuse` option (available since 1.3) in
combination with `-a SOCKET`, which will only start a new daemon if the
specified path does not accept connections already. If the socket appears
to be active, it will just set `SSH_AUTH_SOCK` and exit.
* The exact path used for `-a` is arbitrary. The socket will be created
with only user-accessible permissions, as long as the filesystem is not
mounted `noacl`, but you may still want to use a more private path than
shown above on multi-user systems.
* When using this, the `ssh-pageant` daemon remains to be active (and
visible in your task manager). You should not kill the process, since
open shells might still be using the socket.
* Using `eval` will set the environment variables in the current shell.
By default, ssh-pageant tries to detect the current shell and output
appropriate commands. If detection fails, then use the `-S SHELL` option
to define a shell type manually.
You could also rename `ssh-pageant` to `ssh-agent` and then use something like
`keychain` to manage a single instance (the approach of [Charade]), but that is
unnecessary with the `--reuse` option.
It may be possible to share a Cygwin socket with external tools like
[msysgit](http://msysgit.github.io/), if you use a socket path accessible by
both runtimes. Use `cygpath --windows {path}` to help normalize paths for
system-wide use.
## Options
`ssh-pageant` aims to be compatible with `ssh-agent` options, with a few extras:
$ ssh-pageant -h
Usage: ssh-pageant [options] [command [arg ...]]
Options:
-h, --help Show this help.
-v, --version Display version information.
-c Generate C-shell commands on stdout.
-s Generate Bourne shell commands on stdout.
-S SHELL Generate shell command for "bourne", "csh", or "fish".
-k Kill the current ssh-pageant.
-d Enable debug mode.
-q Enable quiet mode.
-a SOCKET Create socket on a specific path.
-r, --reuse Allow to reuse an existing -a SOCKET.
-t TIME Limit key lifetime in seconds (not supported by PaExcerpt of 7,035 characters
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