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

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{ config, lib, pkgs, ... }:
with lib;
{
options = {
nix.sshServe = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable serving the Nix store as a binary cache via SSH.";
};
keys = mkOption {
type = types.listOf types.str;
default = [];
example = [ "ssh-dss AAAAB3NzaC1k... alice@example.org" ];
description = "A list of SSH public keys allowed to access the binary cache via SSH.";
};
};
};
config = mkIf config.nix.sshServe.enable {
users.extraUsers.nix-ssh = {
description = "Nix SSH substituter user";
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 ${config.nix.package}/bin/nix-store --serve
Match All
'';
users.extraUsers.nix-ssh.openssh.authorizedKeys.keys = config.nix.sshServe.keys;
};
}