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Wonderfall 2022-04-09 19:47:49 +02:00
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content/posts/openssh-fido2.md
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@ -17,7 +17,7 @@ All these attempts are particularly a thing on desktop platforms, because they d
Another layer of defense would obviously be multi-factor authentification, or the fact that you're relying on a shared secret instead. We can use FIDO2 security keys for that. That way, even if your private key is compromised, the attacker needs physical access to your security key. TOTP is another common 2FA technique, but it's vulnerable to various attacks, and relies on the quality of the implementation on the server. Another layer of defense would obviously be multi-factor authentification, or the fact that you're relying on a shared secret instead. We can use FIDO2 security keys for that. That way, even if your private key is compromised, the attacker needs physical access to your security key. TOTP is another common 2FA technique, but it's vulnerable to various attacks, and relies on the quality of the implementation on the server.
Fortunately for us, [OpenSSH 8.2](https://www.openssh.com/txt/release-8.2)] (released in February 2020) introduced native support for FIDO2/U2F. Most OpenSSH distributions should have the middleware set to use the `libfido2` library, including portable versions such as the one [for Win32](https://github.com/PowerShell/Win32-OpenSSH). Basically, `ssh-keygen -t ${key_type}-sk` will generate for us a token-backed key pair. The key types that are supported depend on your security key. Newer models support should support both ECDSA-P256 (`ecdsa-sk`) and Ed25519 (`ed25519-sk`). If the latter is available, you should prefer it. Fortunately for us, [OpenSSH 8.2](https://www.openssh.com/txt/release-8.2) (released in February 2020) introduced native support for FIDO2/U2F. Most OpenSSH distributions should have the middleware set to use the `libfido2` library, including portable versions such as the one [for Win32](https://github.com/PowerShell/Win32-OpenSSH). Basically, `ssh-keygen -t ${key_type}-sk` will generate for us a token-backed key pair. The key types that are supported depend on your security key. Newer models support should support both ECDSA-P256 (`ecdsa-sk`) and Ed25519 (`ed25519-sk`). If the latter is available, you should prefer it.
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