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|
{ config, pkgs, lib, ... }:
with lib;
let
cfg = config.services.heisenbridge;
pkg = config.services.heisenbridge.package;
bin = "${pkg}/bin/heisenbridge";
jsonType = (pkgs.formats.json { }).type;
registrationFile = "/var/lib/heisenbridge/registration.yml";
# JSON is a proper subset of YAML
bridgeConfig = builtins.toFile "heisenbridge-registration.yml" (builtins.toJSON {
id = "heisenbridge";
url = cfg.registrationUrl;
# Don't specify as_token and hs_token
rate_limited = false;
sender_localpart = "heisenbridge";
namespaces = cfg.namespaces;
});
in
{
options.services.heisenbridge = {
enable = mkEnableOption "the Matrix to IRC bridge";
package = mkOption {
type = types.package;
default = pkgs.heisenbridge;
defaultText = "pkgs.heisenbridge";
example = "pkgs.heisenbridge.override { … = …; }";
description = ''
Package of the application to run, exposed for overriding purposes.
'';
};
homeserver = mkOption {
type = types.str;
description = "The URL to the home server for client-server API calls";
example = "http://localhost:8008";
};
registrationUrl = mkOption {
type = types.str;
description = ''
The URL where the application service is listening for HS requests, from the Matrix HS perspective.#
The default value assumes the bridge runs on the same host as the home server, in the same network.
'';
example = "https://matrix.example.org";
default = "http://${cfg.address}:${toString cfg.port}";
defaultText = "http://$${cfg.address}:$${toString cfg.port}";
};
address = mkOption {
type = types.str;
description = "Address to listen on. IPv6 does not seem to be supported.";
default = "127.0.0.1";
example = "0.0.0.0";
};
port = mkOption {
type = types.port;
description = "The port to listen on";
default = 9898;
};
debug = mkOption {
type = types.bool;
description = "More verbose logging. Recommended during initial setup.";
default = false;
};
owner = mkOption {
type = types.nullOr types.str;
description = ''
Set owner MXID otherwise first talking local user will claim the bridge
'';
default = null;
example = "@admin:example.org";
};
namespaces = mkOption {
description = "Configure the 'namespaces' section of the registration.yml for the bridge and the server";
# TODO link to Matrix documentation of the format
type = types.submodule {
freeformType = jsonType;
};
default = {
users = [
{
regex = "@irc_.*";
exclusive = true;
}
];
aliases = [ ];
rooms = [ ];
};
};
identd.enable = mkEnableOption "identd service support";
identd.port = mkOption {
type = types.port;
description = "identd listen port";
default = 113;
};
extraArgs = mkOption {
type = types.listOf types.str;
description = "Heisenbridge is configured over the command line. Append extra arguments here";
default = [ ];
};
};
config = mkIf cfg.enable {
systemd.services.heisenbridge = {
description = "Matrix<->IRC bridge";
before = [ "matrix-synapse.service" ]; # So the registration file can be used by Synapse
wantedBy = [ "multi-user.target" ];
preStart = ''
umask 077
set -e -u -o pipefail
if ! [ -f "${registrationFile}" ]; then
# Generate registration file if not present (actually, we only care about the tokens in it)
${bin} --generate --config ${registrationFile}
fi
# Overwrite the registration file with our generated one (the config may have changed since then),
# but keep the tokens. Two step procedure to be failure safe
${pkgs.yq}/bin/yq --slurp \
'.[0] + (.[1] | {as_token, hs_token})' \
${bridgeConfig} \
${registrationFile} \
> ${registrationFile}.new
mv -f ${registrationFile}.new ${registrationFile}
# Grant Synapse access to the registration
if ${getBin pkgs.glibc}/bin/getent group matrix-synapse > /dev/null; then
chgrp -v matrix-synapse ${registrationFile}
chmod -v g+r ${registrationFile}
fi
'';
serviceConfig = rec {
Type = "simple";
ExecStart = lib.concatStringsSep " " (
[
bin
(if cfg.debug then "-vvv" else "-v")
"--config"
registrationFile
"--listen-address"
(lib.escapeShellArg cfg.address)
"--listen-port"
(toString cfg.port)
]
++ (lib.optionals (cfg.owner != null) [
"--owner"
(lib.escapeShellArg cfg.owner)
])
++ (lib.optionals cfg.identd.enable [
"--identd"
"--identd-port"
(toString cfg.identd.port)
])
++ [
(lib.escapeShellArg cfg.homeserver)
]
++ (map (lib.escapeShellArg) cfg.extraArgs)
);
# Hardening options
User = "heisenbridge";
Group = "heisenbridge";
RuntimeDirectory = "heisenbridge";
RuntimeDirectoryMode = "0700";
StateDirectory = "heisenbridge";
StateDirectoryMode = "0755";
ProtectSystem = "strict";
ProtectHome = true;
PrivateTmp = true;
PrivateDevices = true;
ProtectKernelTunables = true;
ProtectControlGroups = true;
RestrictSUIDSGID = true;
PrivateMounts = true;
ProtectKernelModules = true;
ProtectKernelLogs = true;
ProtectHostname = true;
ProtectClock = true;
ProtectProc = "invisible";
ProcSubset = "pid";
RestrictNamespaces = true;
RemoveIPC = true;
UMask = "0077";
CapabilityBoundingSet = [ "CAP_CHOWN" ] ++ optional (cfg.port < 1024 || (cfg.identd.enable && cfg.identd.port < 1024)) "CAP_NET_BIND_SERVICE";
AmbientCapabilities = CapabilityBoundingSet;
NoNewPrivileges = true;
LockPersonality = true;
RestrictRealtime = true;
SystemCallFilter = ["@system-service" "~@priviledged" "@chown"];
SystemCallArchitectures = "native";
RestrictAddressFamilies = "AF_INET AF_INET6";
};
};
users.groups.heisenbridge = {};
users.users.heisenbridge = {
description = "Service user for the Heisenbridge";
group = "heisenbridge";
isSystemUser = true;
};
};
meta.maintainers = [ lib.maintainers.piegames ];
}
|