sshecret
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I can keep a SSHecret
SSHecret
.. image:: https://github.com/thcipriani/sshecret/workflows/Python%20application/badge.svg :alt: Github workflow badge
.. image:: https://photos.tylercipriani.com/thumbs/2f/ad8870548f45148167f0b41d6e0539/medium.jpg :alt: Don't worry, I can keep a sshecret (photo credit: the Nationaal Archief, the Dutch National Archives, and Spaarnestad Photo, via Wikimedia Commons)
If you have an encrypted ssh key for each domain you access (you should), and you keep your unlocked keys in a single ssh-agent (you maybe shouldn't), AND you've ever decided you need to forward your ssh-agent, then you should feel bad.
If you forward an ssh-agent with all your unique keys for every domain to a ssh server that is compromised - all those unique keys for all those unique domains you access? Kablooie! Done. Have fun rotating them all.
sshecret
is a tool that creates an ssh-agent for each identity file found
in your ssh_config(5)
and executes ssh commands for a particular host using
an environment that has access to only the key for that one host.
If a server to which you've forwarded your ssh-agent is compromised, then only the key used for that domain will be affected.
sshecret
is a wrapper around ssh that automatically manages multiple
ssh-agent(1)
sockets each containing only a single unlocked ssh key.
sshecret
accepts the same parameters as ssh(1)
- fundamentally
sshecret
uses execve(2)
to wrap ssh, modifying the environment to
ensure that each key in your ssh_config(5)
uses its own ssh-agent.
Install
Install via pip::
pip install --user sshecret
Wherever ssh is accepted
To use sshecret
with git, point GIT_SSH
to use sshecret
by adding
this to your shell initialization file (~/.bashrc
or the like)::
if command -v sshecret > /dev/null 2>&1; then
export GIT_SSH=sshecret
fi
To use sshecret
with scp add this alias to your shell initialization file::
if command -v sshecret > /dev/null 2>&1; then
alias scp='scp -S sshecret'
fi
Limitations
sshecret
obviously won't help you if you're using the same ssh key for
multiple domains. You are clearly beyond help.
sshecret
depends on a correct ssh_config(5)
for your user (found at
~/.ssh/config
or wherever $SSH_CONF
is pointing), so it'll get weird if
that file is weird or nonexistent. Sorry, I guess.
Requirements:
- Paramiko_
.. _Paramiko: http://www.paramiko.org/
Usage::
usage: sshecret [whatever you want to pass to ssh]
sshecret is a wrapper around ssh that automatically manages multiple ssh-agent(1)s each containing only a single ssh key.
EXAMPLE: sshecret -A -L8080:localhost:80 -l johndoe -p2222 example.com
sshecret accepts the same parameters as ssh(1) - fundamentally sshecret uses execve(2) to wrap ssh, modifying the environment to ensure that each key in your ssh_config(5) uses its own ssh- agent.
optional arguments: -h, --help show this help message and exit -v Increase verbosity of output