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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.gale;
# we convert the path to a string to avoid it being copied to the nix store,
# otherwise users could read the private key as all files in the store are
# world-readable
keyPath = toString cfg.keyPath;
# ...but we refer to the pubkey file using a path so that we can ensure the
# config gets rebuilt if the public key changes (we can assume the private key
# will never change without the public key having changed)
gpubFile = cfg.keyPath + "/${cfg.domain}.gpub";
home = "/var/lib/gale";
keysPrepared = cfg.keyPath != null && lib.pathExists cfg.keyPath;
in
{
options = {
services.gale = {
enable = mkEnableOption "the Gale messaging daemon";
user = mkOption {
default = "gale";
type = types.str;
description = "Username for the Gale daemon.";
};
group = mkOption {
default = "gale";
type = types.str;
description = "Group name for the Gale daemon.";
};
setuidWrapper = mkOption {
default = null;
description = "Configuration for the Gale gksign setuid wrapper.";
};
domain = mkOption {
default = "";
type = types.str;
description = "Domain name for the Gale system.";
};
keyPath = mkOption {
default = null;
type = types.nullOr types.path;
description = ''
Directory containing the key pair for this Gale domain. The expected
filename will be taken from the domain option with ".gpri" and ".gpub"
appended.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Additional text to be added to <filename>/etc/gale/conf</filename>.
'';
};
};
};
config = mkMerge [
(mkIf cfg.enable {
assertions = [{
assertion = cfg.domain != "";
message = "A domain must be set for Gale.";
}];
warnings = mkIf (!keysPrepared) [
"You must run gale-install in order to generate a domain key."
];
system.activationScripts.gale = mkIf cfg.enable (
stringAfter [ "users" "groups" ] ''
chmod 755 ${home}
mkdir -m 0777 -p ${home}/auth/cache
mkdir -m 1777 -p ${home}/auth/local # GALE_DOMAIN.gpub
mkdir -m 0700 -p ${home}/auth/private # ROOT.gpub
mkdir -m 0755 -p ${home}/auth/trusted # ROOT
mkdir -m 0700 -p ${home}/.gale
mkdir -m 0700 -p ${home}/.gale/auth
mkdir -m 0700 -p ${home}/.gale/auth/private # GALE_DOMAIN.gpri
ln -sf ${pkgs.gale}/etc/gale/auth/trusted/ROOT "${home}/auth/trusted/ROOT"
chown ${cfg.user}:${cfg.group} ${home} ${home}/auth ${home}/auth/*
chown ${cfg.user}:${cfg.group} ${home}/.gale ${home}/.gale/auth ${home}/.gale/auth/private
''
);
environment = {
etc = {
"gale/auth".source = home + "/auth"; # symlink /var/lib/gale/auth
"gale/conf".text = ''
GALE_USER ${cfg.user}
GALE_DOMAIN ${cfg.domain}
${cfg.extraConfig}
'';
};
systemPackages = [ pkgs.gale ];
};
users.extraUsers = [{
name = cfg.user;
description = "Gale daemon";
uid = config.ids.uids.gale;
group = cfg.group;
home = home;
createHome = true;
}];
users.extraGroups = [{
name = cfg.group;
gid = config.ids.gids.gale;
}];
})
(mkIf (cfg.enable && keysPrepared) {
assertions = [
{
assertion = cfg.keyPath != null
&& lib.pathExists (cfg.keyPath + "/${cfg.domain}.gpub");
message = "Couldn't find a Gale public key for ${cfg.domain}.";
}
{
assertion = cfg.keyPath != null
&& lib.pathExists (cfg.keyPath + "/${cfg.domain}.gpri");
message = "Couldn't find a Gale private key for ${cfg.domain}.";
}
];
services.gale.setuidWrapper = {
program = "gksign";
source = "${pkgs.gale}/bin/gksign";
owner = cfg.user;
group = cfg.group;
setuid = true;
setgid = false;
};
security.wrappers.setuid = [ cfg.setuidWrapper ];
systemd.services.gale-galed = {
description = "Gale messaging daemon";
wantedBy = [ "multi-user.target" ];
wants = [ "gale-gdomain.service" ];
after = [ "network.target" ];
preStart = ''
install -m 0640 -o ${cfg.user} -g ${cfg.group} ${keyPath}/${cfg.domain}.gpri "${home}/.gale/auth/private/"
install -m 0644 -o ${cfg.user} -g ${cfg.group} ${gpubFile} "${home}/.gale/auth/private/${cfg.domain}.gpub"
install -m 0644 -o ${cfg.user} -g ${cfg.group} ${gpubFile} "${home}/auth/local/${cfg.domain}.gpub"
'';
serviceConfig = {
Type = "forking";
ExecStart = "@${pkgs.gale}/bin/galed galed";
User = cfg.user;
Group = cfg.group;
PermissionsStartOnly = true;
};
};
systemd.services.gale-gdomain = {
description = "Gale AKD daemon";
wantedBy = [ "multi-user.target" ];
requires = [ "gale-galed.service" ];
after = [ "gale-galed.service" ];
serviceConfig = {
Type = "forking";
ExecStart = "@${pkgs.gale}/bin/gdomain gdomain";
User = cfg.user;
Group = cfg.group;
};
};
})
];
}
|