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nixpkgs/nixos/modules/services/networking/mosquitto.nix

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{ config, lib, pkgs, ...}:
with lib;
let
cfg = config.services.mosquitto;
# note that mosquitto config parsing is very simplistic as of may 2021.
# often times they'll e.g. strtok() a line, check the first two tokens, and ignore the rest.
# there's no escaping available either, so we have to prevent any being necessary.
str = types.strMatching "[^\r\n]*" // {
description = "single-line string";
};
path = types.addCheck types.path (p: str.check "${p}");
configKey = types.strMatching "[^\r\n\t ]+";
optionType = with types; oneOf [ str path bool int ] // {
description = "string, path, bool, or integer";
};
optionToString = v:
if isBool v then boolToString v
else if path.check v then "${v}"
else toString v;
assertKeysValid = prefix: valid: config:
mapAttrsToList
(n: _: {
assertion = valid ? ${n};
message = "Invalid config key ${prefix}.${n}.";
})
config;
formatFreeform = { prefix ? "" }: mapAttrsToList (n: v: "${prefix}${n} ${optionToString v}");
userOptions = with types; submodule {
options = {
password = mkOption {
type = uniq (nullOr str);
default = null;
description = ''
Specifies the (clear text) password for the MQTT User.
'';
};
passwordFile = mkOption {
type = uniq (nullOr types.path);
example = "/path/to/file";
default = null;
description = ''
Specifies the path to a file containing the
clear text password for the MQTT user.
'';
};
hashedPassword = mkOption {
type = uniq (nullOr str);
default = null;
description = ''
Specifies the hashed password for the MQTT User.
To generate hashed password install <literal>mosquitto</literal>
package and use <literal>mosquitto_passwd</literal>.
'';
};
hashedPasswordFile = mkOption {
type = uniq (nullOr types.path);
example = "/path/to/file";
default = null;
description = ''
Specifies the path to a file containing the
hashed password for the MQTT user.
To generate hashed password install <literal>mosquitto</literal>
package and use <literal>mosquitto_passwd</literal>.
'';
};
acl = mkOption {
type = listOf str;
example = [ "read A/B" "readwrite A/#" ];
default = [];
description = ''
Control client access to topics on the broker.
'';
};
};
};
userAsserts = prefix: users:
mapAttrsToList
(n: _: {
assertion = builtins.match "[^:\r\n]+" n != null;
message = "Invalid user name ${n} in ${prefix}";
})
users
++ mapAttrsToList
(n: u: {
assertion = count (s: s != null) [
u.password u.passwordFile u.hashedPassword u.hashedPasswordFile
] <= 1;
message = "Cannot set more than one password option for user ${n} in ${prefix}";
}) users;
makePasswordFile = users: path:
let
makeLines = store: file:
mapAttrsToList
(n: u: "addLine ${escapeShellArg n} ${escapeShellArg u.${store}}")
(filterAttrs (_: u: u.${store} != null) users)
++ mapAttrsToList
(n: u: "addFile ${escapeShellArg n} ${escapeShellArg "${u.${file}}"}")
(filterAttrs (_: u: u.${file} != null) users);
plainLines = makeLines "password" "passwordFile";
hashedLines = makeLines "hashedPassword" "hashedPasswordFile";
in
pkgs.writeScript "make-mosquitto-passwd"
(''
#! ${pkgs.runtimeShell}
set -eu
file=${escapeShellArg path}
rm -f "$file"
touch "$file"
addLine() {
echo "$1:$2" >> "$file"
}
addFile() {
if [ $(wc -l <"$2") -gt 1 ]; then
echo "invalid mosquitto password file $2" >&2
return 1
fi
echo "$1:$(cat "$2")" >> "$file"
}
''
+ concatStringsSep "\n"
(plainLines
++ optional (plainLines != []) ''
${pkgs.mosquitto}/bin/mosquitto_passwd -U "$file"
''
++ hashedLines));
makeACLFile = idx: users: supplement:
pkgs.writeText "mosquitto-acl-${toString idx}.conf"
(concatStringsSep
"\n"
(flatten [
supplement
(mapAttrsToList
(n: u: [ "user ${n}" ] ++ map (t: "topic ${t}") u.acl)
users)
]));
authPluginOptions = with types; submodule {
options = {
plugin = mkOption {
type = path;
description = ''
Plugin path to load, should be a <literal>.so</literal> file.
'';
};
denySpecialChars = mkOption {
type = bool;
description = ''
Automatically disallow all clients using <literal>#</literal>
or <literal>+</literal> in their name/id.
'';
default = true;
};
options = mkOption {
type = attrsOf optionType;
description = ''
Options for the auth plugin. Each key turns into a <literal>auth_opt_*</literal>
line in the config.
'';
default = {};
};
};
};
authAsserts = prefix: auth:
mapAttrsToList
(n: _: {
assertion = configKey.check n;
message = "Invalid auth plugin key ${prefix}.${n}";
})
auth;
formatAuthPlugin = plugin:
[
"auth_plugin ${plugin.plugin}"
"auth_plugin_deny_special_chars ${optionToString plugin.denySpecialChars}"
]
++ formatFreeform { prefix = "auth_opt_"; } plugin.options;
freeformListenerKeys = {
allow_anonymous = 1;
allow_zero_length_clientid = 1;
auto_id_prefix = 1;
cafile = 1;
capath = 1;
certfile = 1;
ciphers = 1;
"ciphers_tls1.3" = 1;
crlfile = 1;
dhparamfile = 1;
http_dir = 1;
keyfile = 1;
max_connections = 1;
max_qos = 1;
max_topic_alias = 1;
mount_point = 1;
protocol = 1;
psk_file = 1;
psk_hint = 1;
require_certificate = 1;
socket_domain = 1;
tls_engine = 1;
tls_engine_kpass_sha1 = 1;
tls_keyform = 1;
tls_version = 1;
use_identity_as_username = 1;
use_subject_as_username = 1;
use_username_as_clientid = 1;
};
listenerOptions = with types; submodule {
options = {
port = mkOption {
type = port;
description = ''
Port to listen on. Must be set to 0 to listen on a unix domain socket.
'';
default = 1883;
};
address = mkOption {
type = nullOr str;
description = ''
Address to listen on. Listen on <literal>0.0.0.0</literal>/<literal>::</literal>
when unset.
'';
default = null;
};
authPlugins = mkOption {
type = listOf authPluginOptions;
description = ''
Authentication plugin to attach to this listener.
Refer to the <link xlink:href="https://mosquitto.org/man/mosquitto-conf-5.html">
mosquitto.conf documentation</link> for details on authentication plugins.
'';
default = [];
};
users = mkOption {
type = attrsOf userOptions;
example = { john = { password = "123456"; acl = [ "readwrite john/#" ]; }; };
description = ''
A set of users and their passwords and ACLs.
'';
default = {};
};
omitPasswordAuth = mkOption {
type = bool;
description = ''
Omits password checking, allowing anyone to log in with any user name unless
other mandatory authentication methods (eg TLS client certificates) are configured.
'';
default = false;
};
acl = mkOption {
type = listOf str;
description = ''
Additional ACL items to prepend to the generated ACL file.
'';
example = [ "pattern read #" "topic readwrite anon/report/#" ];
default = [];
};
settings = mkOption {
type = submodule {
freeformType = attrsOf optionType;
};
description = ''
Additional settings for this listener.
'';
default = {};
};
};
};
listenerAsserts = prefix: listener:
assertKeysValid prefix freeformListenerKeys listener.settings
++ userAsserts prefix listener.users
++ imap0
(i: v: authAsserts "${prefix}.authPlugins.${toString i}" v)
listener.authPlugins;
formatListener = idx: listener:
[
"listener ${toString listener.port} ${toString listener.address}"
"acl_file ${makeACLFile idx listener.users listener.acl}"
]
++ optional (! listener.omitPasswordAuth) "password_file ${cfg.dataDir}/passwd-${toString idx}"
++ formatFreeform {} listener.settings
++ concatMap formatAuthPlugin listener.authPlugins;
freeformBridgeKeys = {
bridge_alpn = 1;
bridge_attempt_unsubscribe = 1;
bridge_bind_address = 1;
bridge_cafile = 1;
bridge_capath = 1;
bridge_certfile = 1;
bridge_identity = 1;
bridge_insecure = 1;
bridge_keyfile = 1;
bridge_max_packet_size = 1;
bridge_outgoing_retain = 1;
bridge_protocol_version = 1;
bridge_psk = 1;
bridge_require_ocsp = 1;
bridge_tls_version = 1;
cleansession = 1;
idle_timeout = 1;
keepalive_interval = 1;
local_cleansession = 1;
local_clientid = 1;
local_password = 1;
local_username = 1;
notification_topic = 1;
notifications = 1;
notifications_local_only = 1;
remote_clientid = 1;
remote_password = 1;
remote_username = 1;
restart_timeout = 1;
round_robin = 1;
start_type = 1;
threshold = 1;
try_private = 1;
};
bridgeOptions = with types; submodule {
options = {
addresses = mkOption {
type = listOf (submodule {
options = {
address = mkOption {
type = str;
description = ''
Address of the remote MQTT broker.
'';
};
port = mkOption {
type = port;
description = ''
Port of the remote MQTT broker.
'';
default = 1883;
};
};
});
default = [];
description = ''
Remote endpoints for the bridge.
'';
};
topics = mkOption {
type = listOf str;
description = ''
Topic patterns to be shared between the two brokers.
Refer to the <link xlink:href="https://mosquitto.org/man/mosquitto-conf-5.html">
mosquitto.conf documentation</link> for details on the format.
'';
default = [];
example = [ "# both 2 local/topic/ remote/topic/" ];
};
settings = mkOption {
type = submodule {
freeformType = attrsOf optionType;
};
description = ''
Additional settings for this bridge.
'';
default = {};
};
};
};
bridgeAsserts = prefix: bridge:
assertKeysValid prefix freeformBridgeKeys bridge.settings
++ [ {
assertion = length bridge.addresses > 0;
message = "Bridge ${prefix} needs remote broker addresses";
} ];
formatBridge = name: bridge:
[
"connection ${name}"
"addresses ${concatMapStringsSep " " (a: "${a.address}:${toString a.port}") bridge.addresses}"
]
++ map (t: "topic ${t}") bridge.topics
++ formatFreeform {} bridge.settings;
freeformGlobalKeys = {
allow_duplicate_messages = 1;
autosave_interval = 1;
autosave_on_changes = 1;
check_retain_source = 1;
connection_messages = 1;
log_facility = 1;
log_timestamp = 1;
log_timestamp_format = 1;
max_inflight_bytes = 1;
max_inflight_messages = 1;
max_keepalive = 1;
max_packet_size = 1;
max_queued_bytes = 1;
max_queued_messages = 1;
memory_limit = 1;
message_size_limit = 1;
persistence_file = 1;
persistence_location = 1;
persistent_client_expiration = 1;
pid_file = 1;
queue_qos0_messages = 1;
retain_available = 1;
set_tcp_nodelay = 1;
sys_interval = 1;
upgrade_outgoing_qos = 1;
websockets_headers_size = 1;
websockets_log_level = 1;
};
globalOptions = with types; {
enable = mkEnableOption "the MQTT Mosquitto broker";
bridges = mkOption {
type = attrsOf bridgeOptions;
default = {};
description = ''
Bridges to build to other MQTT brokers.
'';
};
listeners = mkOption {
type = listOf listenerOptions;
default = {};
description = ''
Listeners to configure on this broker.
'';
};
includeDirs = mkOption {
type = listOf path;
description = ''
Directories to be scanned for further config files to include.
Directories will processed in the order given,
<literal>*.conf</literal> files in the directory will be
read in case-sensistive alphabetical order.
'';
default = [];
};
logDest = mkOption {
type = listOf (either path (enum [ "stdout" "stderr" "syslog" "topic" "dlt" ]));
description = ''
Destinations to send log messages to.
'';
default = [ "stderr" ];
};
logType = mkOption {
type = listOf (enum [ "debug" "error" "warning" "notice" "information"
"subscribe" "unsubscribe" "websockets" "none" "all" ]);
description = ''
Types of messages to log.
'';
default = [];
};
persistence = mkOption {
type = bool;
description = ''
Enable persistent storage of subscriptions and messages.
'';
default = true;
};
dataDir = mkOption {
default = "/var/lib/mosquitto";
type = types.path;
description = ''
The data directory.
'';
};
settings = mkOption {
type = submodule {
freeformType = attrsOf optionType;
};
description = ''
Global configuration options for the mosquitto broker.
'';
default = {};
};
};
globalAsserts = prefix: cfg:
flatten [
(assertKeysValid prefix freeformGlobalKeys cfg.settings)
(imap0 (n: l: listenerAsserts "${prefix}.listener.${toString n}" l) cfg.listeners)
(mapAttrsToList (n: b: bridgeAsserts "${prefix}.bridge.${n}" b) cfg.bridges)
];
formatGlobal = cfg:
[
"per_listener_settings true"
"persistence ${optionToString cfg.persistence}"
]
++ map
(d: if path.check d then "log_dest file ${d}" else "log_dest ${d}")
cfg.logDest
++ map (t: "log_type ${t}") cfg.logType
++ formatFreeform {} cfg.settings
++ concatLists (imap0 formatListener cfg.listeners)
++ concatLists (mapAttrsToList formatBridge cfg.bridges)
++ map (d: "include_dir ${d}") cfg.includeDirs;
configFile = pkgs.writeText "mosquitto.conf"
(concatStringsSep "\n" (formatGlobal cfg));
in
{
###### Interface
options.services.mosquitto = globalOptions;
###### Implementation
config = mkIf cfg.enable {
assertions = globalAsserts "services.mosquitto" cfg;
systemd.services.mosquitto = {
description = "Mosquitto MQTT Broker Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
Type = "notify";
NotifyAccess = "main";
User = "mosquitto";
Group = "mosquitto";
RuntimeDirectory = "mosquitto";
WorkingDirectory = cfg.dataDir;
Restart = "on-failure";
ExecStart = "${pkgs.mosquitto}/bin/mosquitto -c ${configFile}";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
# Hardening
CapabilityBoundingSet = "";
DevicePolicy = "closed";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateTmp = true;
PrivateUsers = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProcSubset = "pid";
ProtectSystem = "strict";
ReadWritePaths = [
cfg.dataDir
"/tmp" # mosquitto_passwd creates files in /tmp before moving them
] ++ filter path.check cfg.logDest;
ReadOnlyPaths =
map (p: "${p}")
(cfg.includeDirs
++ filter
(v: v != null)
(flatten [
(map
(l: [
(l.settings.psk_file or null)
(l.settings.http_dir or null)
(l.settings.cafile or null)
(l.settings.capath or null)
(l.settings.certfile or null)
(l.settings.crlfile or null)
(l.settings.dhparamfile or null)
(l.settings.keyfile or null)
])
cfg.listeners)
(mapAttrsToList
(_: b: [
(b.settings.bridge_cafile or null)
(b.settings.bridge_capath or null)
(b.settings.bridge_certfile or null)
(b.settings.bridge_keyfile or null)
])
cfg.bridges)
]));
RemoveIPC = true;
RestrictAddressFamilies = [
"AF_UNIX" # for sd_notify() call
"AF_INET"
"AF_INET6"
];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [
"@system-service"
"~@privileged"
"~@resources"
];
UMask = "0077";
};
preStart =
concatStringsSep
"\n"
(imap0
(idx: listener: makePasswordFile listener.users "${cfg.dataDir}/passwd-${toString idx}")
cfg.listeners);
};
users.users.mosquitto = {
description = "Mosquitto MQTT Broker Daemon owner";
group = "mosquitto";
uid = config.ids.uids.mosquitto;
home = cfg.dataDir;
createHome = true;
};
users.groups.mosquitto.gid = config.ids.gids.mosquitto;
};
meta = {
maintainers = with lib.maintainers; [ pennae ];
# Don't edit the docbook xml directly, edit the md and generate it:
# `pandoc mosquitto.md -t docbook --top-level-division=chapter --extract-media=media -f markdown+smart > mosquitto.xml`
doc = ./mosquitto.xml;
};
}