nixpkgs/nixos/modules/services/misc/nix-ssh-serve.nix

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{ config, lib, pkgs, ... }:
let
serveOnly = pkgs.writeScript "nix-store-serve" ''
#!${pkgs.stdenv.shell}
if [ "$SSH_ORIGINAL_COMMAND" != "nix-store --serve" ]; then
echo 'Error: You are only allowed to run `nix-store --serve'\'''!' >&2
exit 1
fi
exec /run/current-system/sw/bin/nix-store --serve
'';
inherit (lib) mkIf mkOption types;
in {
options = {
nix.sshServe = {
enable = mkOption {
description = "Whether to enable serving the nix store over ssh.";
default = false;
type = types.bool;
};
};
};
config = mkIf config.nix.sshServe.enable {
users.extraUsers.nix-ssh = {
description = "User for running nix-store --serve.";
uid = config.ids.uids.nix-ssh;
shell = pkgs.stdenv.shell;
};
services.openssh.enable = true;
services.openssh.extraConfig = ''
Match User nix-ssh
AllowAgentForwarding no
AllowTcpForwarding no
PermitTTY no
PermitTunnel no
X11Forwarding no
ForceCommand ${serveOnly}
Match All
'';
};
}