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by cassianoleal 3004 days ago
Wait, you keep private SSH keys on bastion hosts?

It's much better practice to use the bastion as a proxy to the other hosts. This is easily achieved using the ProxyCommand option of OpenSSH.

No agent forwarding, no secrets kept in random hosts.
2 comments
JoachimSchipper 3004 days ago
No, keeping SSH keys on bastion hosts was the silliest reasonable thing I could think of.
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scrollaway 3004 days ago
Do you know a good guide with standard practices for setting up and securing bastion hosts (preferably on aws)?
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toomuchtodo 3004 days ago
If you don’t require interactive sessions, consider using AWS SSM run command [1] instead. You install the agent on the instances, with commands sent from the client through the AWS control plane (with IAM and SSM documents for access control and CloudTrail logs of all commands issued).

I’m currently deploying it in an enterprise for ~5k users, and it works surprisingly well for providing the ability to run arbitrary commands on instances without ssh access.

[1] https://docs.aws.amazon.com/systems-manager/latest/userguide...

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