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Hardening SSH at Scale: From Bastion Hosts to Zero-Trust Tunnels

Most teams treat SSH access as a solved problem. It isn't. A systematic walkthrough of every layer that separates a secure fleet from a breach waiting to happen.

SSH is the backbone of remote access for most engineering teams. And yet, in security audits across dozens of companies, it remains one of the most consistently misunderstood parts of the stack.

Why bastion hosts aren't enough anymore

The traditional model — a hardened jump host sitting at the perimeter — made sense in 2012. It consolidated your attack surface and gave you a single audit point.

What it doesn't give you is credential hygiene, session recording, or meaningful protection against a compromised bastion. If someone exfiltrates your team's private keys — and they will try — a bastion host slows them down by exactly one step.

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