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{ config, lib, ... }:
with lib;
let cfg = config.nix.sshServe;
command =
if cfg.protocol == "ssh"
then "nix-store --serve ${lib.optionalString cfg.write "--write"}"
else "nix-daemon --stdio";
in {
options = {
nix.sshServe = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable serving the Nix store as a remote store via SSH.";
};
write = mkOption {
type = types.bool;
default = false;
description = "Whether to enable writing to the Nix store as a remote store via SSH. Note: the sshServe user is named nix-ssh and is not a trusted-user. nix-ssh should be added to the <option>nix.settings.trusted-users</option> option in most use cases, such as allowing remote building of derivations.";
};
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.";
};
protocol = mkOption {
type = types.enum [ "ssh" "ssh-ng" ];
default = "ssh";
description = "The specific Nix-over-SSH protocol to use.";
};
};
};
config = mkIf cfg.enable {
users.users.nix-ssh = {
description = "Nix SSH store user";
isSystemUser = true;
group = "nix-ssh";
useDefaultShell = true;
};
users.groups.nix-ssh = {};
services.openssh.enable = true;
services.openssh.extraConfig = ''
Match User nix-ssh
AllowAgentForwarding no
AllowTcpForwarding no
PermitTTY no
PermitTunnel no
X11Forwarding no
ForceCommand ${config.nix.package.out}/bin/${command}
Match All
'';
users.users.nix-ssh.openssh.authorizedKeys.keys = cfg.keys;
};
}
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