nix-config/nixos/_mixins/global/openssh.nix

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{ outputs, lib, config, ... }:
let
hosts = outputs.nixosConfigurations;
pubKey = host: ../../${host}/ssh_host_ed25519_key.pub;
# Sops needs acess to the keys before the persist dirs are even mounted; so
# just persisting the keys won't work, we must point at /persist
hasOptinPersistence = config.environment.persistence ? "/persist";
in
{
services.openssh = {
enable = true;
settings = {
# Harden
PasswordAuthentication = false;
PermitRootLogin = "no";
# Automatically remove stale sockets
StreamLocalBindUnlink = "yes";
# Allow forwarding ports to everywhere
GatewayPorts = "clientspecified";
};
hostKeys = [{
path = "${lib.optionalString hasOptinPersistence "/persist"}/etc/ssh/ssh_host_ed25519_key";
type = "ed25519";
}];
};
programs.ssh = {
# Each hosts public key
knownHosts = builtins.mapAttrs
(name: _: {
publicKeyFile = pubKey name;
# extraHostNames =
# (lib.optional (name == hostName) "localhost") ++ # Alias for localhost if it's the same host
# (lib.optionals (name == gitHost) [ "burd.me" "git.burd.me" ]);
})
hosts;
};
# Passwordless sudo when SSH'ing with keys
security.pam.enableSSHAgentAuth = true;
}