nixos/services/openssh.nix

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{ config, lib, pkgs, ... }:
# For reference:
# https://infosec.mozilla.org/guidelines/openssh.html
# https://stribika.github.io/2015/01/04/secure-secure-shell.html
with lib;
mkIf (elem "openssh" config.machine.services) {
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services.openssh = {
enable = true;
sftpFlags = [ "-f AUTHPRIV" "-l INFO" ];
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startWhenNeeded = true;
challengeResponseAuthentication = false;
passwordAuthentication = false;
permitRootLogin = "no";
extraConfig = ''
AllowUsers derped git nix-ssh
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'';
};
}