724 lines
21 KiB
Nix
724 lines
21 KiB
Nix
{ config, lib, pkgs, ...}:
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let
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cfg = config.services.mosquitto;
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# note that mosquitto config parsing is very simplistic as of may 2021.
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# often times they'll e.g. strtok() a line, check the first two tokens, and ignore the rest.
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# there's no escaping available either, so we have to prevent any being necessary.
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str = lib.types.strMatching "[^\r\n]*" // {
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description = "single-line string";
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};
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path = lib.types.addCheck lib.types.path (p: str.check "${p}");
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configKey = lib.types.strMatching "[^\r\n\t ]+";
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optionType = with lib.types; oneOf [ str path bool int ] // {
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description = "string, path, bool, or integer";
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};
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optionToString = v:
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if lib.isBool v then lib.boolToString v
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else if path.check v then "${v}"
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else toString v;
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assertKeysValid = prefix: valid: config:
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lib.mapAttrsToList
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(n: _: {
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assertion = valid ? ${n};
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message = "Invalid config key ${prefix}.${n}.";
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})
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config;
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formatFreeform = { prefix ? "" }: lib.mapAttrsToList (n: v: "${prefix}${n} ${optionToString v}");
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userOptions = with lib.types; submodule {
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options = {
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password = lib.mkOption {
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type = uniq (nullOr str);
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default = null;
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description = ''
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Specifies the (clear text) password for the MQTT User.
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'';
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};
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passwordFile = lib.mkOption {
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type = uniq (nullOr path);
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example = "/path/to/file";
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default = null;
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description = ''
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Specifies the path to a file containing the
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clear text password for the MQTT user.
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The file is securely passed to mosquitto by
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leveraging systemd credentials. No special
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permissions need to be set on this file.
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'';
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};
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hashedPassword = lib.mkOption {
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type = uniq (nullOr str);
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default = null;
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description = ''
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Specifies the hashed password for the MQTT User.
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To generate hashed password install the `mosquitto`
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package and use `mosquitto_passwd`, then extract
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the second field (after the `:`) from the generated
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file.
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'';
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};
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hashedPasswordFile = lib.mkOption {
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type = uniq (nullOr path);
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example = "/path/to/file";
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default = null;
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description = ''
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Specifies the path to a file containing the
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hashed password for the MQTT user.
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To generate hashed password install the `mosquitto`
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package and use `mosquitto_passwd`, then remove the
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`username:` prefix from the generated file.
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The file is securely passed to mosquitto by
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leveraging systemd credentials. No special
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permissions need to be set on this file.
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'';
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};
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acl = lib.mkOption {
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type = listOf str;
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example = [ "read A/B" "readwrite A/#" ];
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default = [];
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description = ''
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Control client access to topics on the broker.
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'';
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};
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};
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};
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userAsserts = prefix: users:
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lib.mapAttrsToList
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(n: _: {
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assertion = builtins.match "[^:\r\n]+" n != null;
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message = "Invalid user name ${n} in ${prefix}";
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})
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users
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++ lib.mapAttrsToList
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(n: u: {
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assertion = lib.count (s: s != null) [
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u.password u.passwordFile u.hashedPassword u.hashedPasswordFile
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] <= 1;
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message = "Cannot set more than one password option for user ${n} in ${prefix}";
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}) users;
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listenerScope = index: "listener-${toString index}";
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userScope = prefix: index: "${prefix}-user-${toString index}";
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credentialID = prefix: credential: "${prefix}-${credential}";
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toScopedUsers = listenerScope: users: lib.pipe users [
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lib.attrNames
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(lib.imap0 (index: user: lib.nameValuePair user
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(users.${user} // { scope = userScope listenerScope index; })
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))
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lib.listToAttrs
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];
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userCredentials = user: credentials: lib.pipe credentials [
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(lib.filter (credential: user.${credential} != null))
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(map (credential: "${credentialID user.scope credential}:${user.${credential}}"))
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];
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usersCredentials = listenerScope: users: credentials: lib.pipe users [
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(toScopedUsers listenerScope)
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(lib.mapAttrsToList (_: user: userCredentials user credentials))
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lib.concatLists
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];
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systemdCredentials = listeners: listenerCredentials: lib.pipe listeners [
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(lib.imap0 (index: listener: listenerCredentials (listenerScope index) listener))
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lib.concatLists
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];
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makePasswordFile = listenerScope: users: path:
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let
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makeLines = store: file: let
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scopedUsers = toScopedUsers listenerScope users;
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in
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lib.mapAttrsToList
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(name: user: ''addLine ${lib.escapeShellArg name} "''$(systemd-creds cat ${credentialID user.scope store})"'')
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(lib.filterAttrs (_: user: user.${store} != null) scopedUsers)
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++ lib.mapAttrsToList
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(name: user: ''addFile ${lib.escapeShellArg name} "''${CREDENTIALS_DIRECTORY}/${credentialID user.scope file}"'')
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(lib.filterAttrs (_: user: user.${file} != null) scopedUsers);
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plainLines = makeLines "password" "passwordFile";
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hashedLines = makeLines "hashedPassword" "hashedPasswordFile";
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in
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pkgs.writeScript "make-mosquitto-passwd"
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(''
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#! ${pkgs.runtimeShell}
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set -eu
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file=${lib.escapeShellArg path}
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rm -f "$file"
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touch "$file"
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addLine() {
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echo "$1:$2" >> "$file"
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}
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addFile() {
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if [ $(wc -l <"$2") -gt 1 ]; then
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echo "invalid mosquitto password file $2" >&2
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return 1
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fi
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echo "$1:$(cat "$2")" >> "$file"
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}
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''
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+ lib.concatStringsSep "\n"
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(plainLines
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++ lib.optional (plainLines != []) ''
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${cfg.package}/bin/mosquitto_passwd -U "$file"
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''
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++ hashedLines));
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authPluginOptions = with lib.types; submodule {
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options = {
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plugin = lib.mkOption {
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type = path;
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description = ''
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Plugin path to load, should be a `.so` file.
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'';
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};
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denySpecialChars = lib.mkOption {
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type = bool;
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description = ''
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Automatically disallow all clients using `#`
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or `+` in their name/id.
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'';
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default = true;
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};
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options = lib.mkOption {
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type = attrsOf optionType;
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description = ''
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Options for the auth plugin. Each key turns into a `auth_opt_*`
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line in the config.
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'';
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default = {};
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};
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};
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};
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authAsserts = prefix: auth:
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lib.mapAttrsToList
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(n: _: {
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assertion = configKey.check n;
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message = "Invalid auth plugin key ${prefix}.${n}";
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})
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auth;
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formatAuthPlugin = plugin:
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[
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"auth_plugin ${plugin.plugin}"
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"auth_plugin_deny_special_chars ${optionToString plugin.denySpecialChars}"
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]
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++ formatFreeform { prefix = "auth_opt_"; } plugin.options;
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freeformListenerKeys = {
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allow_anonymous = 1;
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allow_zero_length_clientid = 1;
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auto_id_prefix = 1;
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bind_interface = 1;
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cafile = 1;
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capath = 1;
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certfile = 1;
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ciphers = 1;
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"ciphers_tls1.3" = 1;
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crlfile = 1;
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dhparamfile = 1;
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http_dir = 1;
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keyfile = 1;
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max_connections = 1;
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max_qos = 1;
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max_topic_alias = 1;
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mount_point = 1;
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protocol = 1;
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psk_file = 1;
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psk_hint = 1;
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require_certificate = 1;
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socket_domain = 1;
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tls_engine = 1;
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tls_engine_kpass_sha1 = 1;
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tls_keyform = 1;
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tls_version = 1;
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use_identity_as_username = 1;
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use_subject_as_username = 1;
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use_username_as_clientid = 1;
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};
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listenerOptions = with lib.types; submodule {
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options = {
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port = lib.mkOption {
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type = port;
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description = ''
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Port to listen on. Must be set to 0 to listen on a unix domain socket.
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'';
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default = 1883;
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};
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address = lib.mkOption {
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type = nullOr str;
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description = ''
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Address to listen on. Listen on `0.0.0.0`/`::`
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when unset.
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'';
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default = null;
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};
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authPlugins = lib.mkOption {
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type = listOf authPluginOptions;
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description = ''
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Authentication plugin to attach to this listener.
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Refer to the [mosquitto.conf documentation](https://mosquitto.org/man/mosquitto-conf-5.html)
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for details on authentication plugins.
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'';
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default = [];
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};
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users = lib.mkOption {
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type = attrsOf userOptions;
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example = { john = { password = "123456"; acl = [ "readwrite john/#" ]; }; };
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description = ''
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A set of users and their passwords and ACLs.
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'';
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default = {};
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};
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omitPasswordAuth = lib.mkOption {
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type = bool;
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description = ''
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Omits password checking, allowing anyone to log in with any user name unless
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other mandatory authentication methods (eg TLS client certificates) are configured.
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'';
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default = false;
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};
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acl = lib.mkOption {
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type = listOf str;
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description = ''
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Additional ACL items to prepend to the generated ACL file.
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'';
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example = [ "pattern read #" "topic readwrite anon/report/#" ];
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default = [];
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};
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settings = lib.mkOption {
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type = submodule {
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freeformType = attrsOf optionType;
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};
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description = ''
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Additional settings for this listener.
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'';
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default = {};
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};
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};
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};
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listenerAsserts = prefix: listener:
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assertKeysValid "${prefix}.settings" freeformListenerKeys listener.settings
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++ userAsserts prefix listener.users
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++ lib.imap0
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(i: v: authAsserts "${prefix}.authPlugins.${toString i}" v)
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listener.authPlugins;
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formatListener = idx: listener:
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[
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"listener ${toString listener.port} ${toString listener.address}"
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"acl_file /etc/mosquitto/acl-${toString idx}.conf"
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]
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++ lib.optional (! listener.omitPasswordAuth) "password_file ${cfg.dataDir}/passwd-${toString idx}"
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++ formatFreeform {} listener.settings
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++ lib.concatMap formatAuthPlugin listener.authPlugins;
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freeformBridgeKeys = {
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bridge_alpn = 1;
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bridge_attempt_unsubscribe = 1;
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bridge_bind_address = 1;
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bridge_cafile = 1;
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bridge_capath = 1;
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bridge_certfile = 1;
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bridge_identity = 1;
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bridge_insecure = 1;
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bridge_keyfile = 1;
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bridge_max_packet_size = 1;
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bridge_outgoing_retain = 1;
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bridge_protocol_version = 1;
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bridge_psk = 1;
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bridge_require_ocsp = 1;
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bridge_tls_version = 1;
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cleansession = 1;
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idle_timeout = 1;
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keepalive_interval = 1;
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local_cleansession = 1;
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local_clientid = 1;
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local_password = 1;
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local_username = 1;
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notification_topic = 1;
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notifications = 1;
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notifications_local_only = 1;
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remote_clientid = 1;
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remote_password = 1;
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remote_username = 1;
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restart_timeout = 1;
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round_robin = 1;
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start_type = 1;
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threshold = 1;
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try_private = 1;
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};
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bridgeOptions = with lib.types; submodule {
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options = {
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addresses = lib.mkOption {
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type = listOf (submodule {
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options = {
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address = lib.mkOption {
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type = str;
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description = ''
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Address of the remote MQTT broker.
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'';
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};
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port = lib.mkOption {
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type = port;
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description = ''
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Port of the remote MQTT broker.
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'';
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default = 1883;
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};
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};
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});
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default = [];
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description = ''
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Remote endpoints for the bridge.
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'';
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};
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topics = lib.mkOption {
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type = listOf str;
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description = ''
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Topic patterns to be shared between the two brokers.
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Refer to the [
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mosquitto.conf documentation](https://mosquitto.org/man/mosquitto-conf-5.html) for details on the format.
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'';
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default = [];
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example = [ "# both 2 local/topic/ remote/topic/" ];
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};
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settings = lib.mkOption {
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type = submodule {
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freeformType = attrsOf optionType;
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};
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description = ''
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Additional settings for this bridge.
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'';
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default = {};
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};
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};
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};
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bridgeAsserts = prefix: bridge:
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assertKeysValid "${prefix}.settings" freeformBridgeKeys bridge.settings
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++ [ {
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assertion = lib.length bridge.addresses > 0;
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message = "Bridge ${prefix} needs remote broker addresses";
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} ];
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formatBridge = name: bridge:
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[
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"connection ${name}"
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"addresses ${lib.concatMapStringsSep " " (a: "${a.address}:${toString a.port}") bridge.addresses}"
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]
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++ map (t: "topic ${t}") bridge.topics
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++ formatFreeform {} bridge.settings;
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freeformGlobalKeys = {
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allow_duplicate_messages = 1;
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autosave_interval = 1;
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autosave_on_changes = 1;
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check_retain_source = 1;
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connection_messages = 1;
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log_facility = 1;
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log_timestamp = 1;
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log_timestamp_format = 1;
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max_inflight_bytes = 1;
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max_inflight_messages = 1;
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max_keepalive = 1;
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max_packet_size = 1;
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max_queued_bytes = 1;
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max_queued_messages = 1;
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memory_limit = 1;
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message_size_limit = 1;
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persistence_file = 1;
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persistence_location = 1;
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persistent_client_expiration = 1;
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pid_file = 1;
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queue_qos0_messages = 1;
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retain_available = 1;
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set_tcp_nodelay = 1;
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sys_interval = 1;
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upgrade_outgoing_qos = 1;
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websockets_headers_size = 1;
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websockets_log_level = 1;
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};
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globalOptions = with lib.types; {
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enable = lib.mkEnableOption "the MQTT Mosquitto broker";
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package = lib.mkPackageOption pkgs "mosquitto" { };
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bridges = lib.mkOption {
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type = attrsOf bridgeOptions;
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default = {};
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description = ''
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Bridges to build to other MQTT brokers.
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'';
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};
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listeners = lib.mkOption {
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type = listOf listenerOptions;
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default = [];
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description = ''
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Listeners to configure on this broker.
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'';
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};
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includeDirs = lib.mkOption {
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type = listOf path;
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description = ''
|
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Directories to be scanned for further config files to include.
|
|
Directories will processed in the order given,
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`*.conf` files in the directory will be
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read in case-sensitive alphabetical order.
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'';
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default = [];
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};
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logDest = lib.mkOption {
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type = listOf (either path (enum [ "stdout" "stderr" "syslog" "topic" "dlt" ]));
|
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description = ''
|
|
Destinations to send log messages to.
|
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'';
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default = [ "stderr" ];
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};
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|
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logType = lib.mkOption {
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type = listOf (enum [ "debug" "error" "warning" "notice" "information"
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"subscribe" "unsubscribe" "websockets" "none" "all" ]);
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|
description = ''
|
|
Types of messages to log.
|
|
'';
|
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default = [];
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};
|
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|
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persistence = lib.mkOption {
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type = bool;
|
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description = ''
|
|
Enable persistent storage of subscriptions and messages.
|
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'';
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default = true;
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};
|
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dataDir = lib.mkOption {
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default = "/var/lib/mosquitto";
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type = lib.types.path;
|
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description = ''
|
|
The data directory.
|
|
'';
|
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};
|
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|
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settings = lib.mkOption {
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type = submodule {
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freeformType = attrsOf optionType;
|
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};
|
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description = ''
|
|
Global configuration options for the mosquitto broker.
|
|
'';
|
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default = {};
|
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};
|
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};
|
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|
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globalAsserts = prefix: cfg:
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lib.flatten [
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(assertKeysValid "${prefix}.settings" freeformGlobalKeys cfg.settings)
|
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(lib.imap0 (n: l: listenerAsserts "${prefix}.listener.${toString n}" l) cfg.listeners)
|
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(lib.mapAttrsToList (n: b: bridgeAsserts "${prefix}.bridge.${n}" b) cfg.bridges)
|
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];
|
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|
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formatGlobal = cfg:
|
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[
|
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"per_listener_settings true"
|
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"persistence ${optionToString cfg.persistence}"
|
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]
|
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++ 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
|
|
++ lib.concatLists (lib.imap0 formatListener cfg.listeners)
|
|
++ lib.concatLists (lib.mapAttrsToList formatBridge cfg.bridges)
|
|
++ map (d: "include_dir ${d}") cfg.includeDirs;
|
|
|
|
configFile = pkgs.writeText "mosquitto.conf"
|
|
(lib.concatStringsSep "\n" (formatGlobal cfg));
|
|
|
|
in
|
|
|
|
{
|
|
|
|
###### Interface
|
|
|
|
options.services.mosquitto = globalOptions;
|
|
|
|
###### Implementation
|
|
|
|
config = lib.mkIf cfg.enable {
|
|
|
|
assertions = globalAsserts "services.mosquitto" cfg;
|
|
|
|
systemd.services.mosquitto = {
|
|
description = "Mosquitto MQTT Broker Daemon";
|
|
wantedBy = [ "multi-user.target" ];
|
|
wants = [ "network-online.target" ];
|
|
after = [ "network-online.target" ];
|
|
serviceConfig = {
|
|
Type = "notify";
|
|
NotifyAccess = "main";
|
|
User = "mosquitto";
|
|
Group = "mosquitto";
|
|
RuntimeDirectory = "mosquitto";
|
|
WorkingDirectory = cfg.dataDir;
|
|
Restart = "on-failure";
|
|
ExecStart = "${cfg.package}/bin/mosquitto -c ${configFile}";
|
|
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
|
|
|
|
# Credentials
|
|
SetCredential = let
|
|
listenerCredentials = listenerScope: listener:
|
|
usersCredentials listenerScope listener.users [ "password" "hashedPassword" ];
|
|
in
|
|
systemdCredentials cfg.listeners listenerCredentials;
|
|
|
|
LoadCredential = let
|
|
listenerCredentials = listenerScope: listener:
|
|
usersCredentials listenerScope listener.users [ "passwordFile" "hashedPasswordFile" ];
|
|
in
|
|
systemdCredentials cfg.listeners listenerCredentials;
|
|
|
|
# Hardening
|
|
CapabilityBoundingSet = "";
|
|
DevicePolicy = "closed";
|
|
LockPersonality = true;
|
|
MemoryDenyWriteExecute = true;
|
|
NoNewPrivileges = true;
|
|
PrivateDevices = true;
|
|
PrivateTmp = true;
|
|
PrivateUsers = true;
|
|
ProtectClock = true;
|
|
ProtectControlGroups = true;
|
|
ProtectHome = true;
|
|
ProtectHostname = true;
|
|
ProtectKernelLogs = true;
|
|
ProtectKernelModules = true;
|
|
ProtectKernelTunables = true;
|
|
ProtectProc = "invisible";
|
|
ProcSubset = "pid";
|
|
ProtectSystem = "strict";
|
|
ReadWritePaths = [
|
|
cfg.dataDir
|
|
"/tmp" # mosquitto_passwd creates files in /tmp before moving them
|
|
] ++ lib.filter path.check cfg.logDest;
|
|
ReadOnlyPaths =
|
|
map (p: "${p}")
|
|
(cfg.includeDirs
|
|
++ lib.filter
|
|
(v: v != null)
|
|
(lib.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)
|
|
(lib.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"
|
|
"AF_INET"
|
|
"AF_INET6"
|
|
"AF_NETLINK"
|
|
];
|
|
RestrictNamespaces = true;
|
|
RestrictRealtime = true;
|
|
RestrictSUIDSGID = true;
|
|
SystemCallArchitectures = "native";
|
|
SystemCallFilter = [
|
|
"@system-service"
|
|
"~@privileged"
|
|
"~@resources"
|
|
];
|
|
UMask = "0077";
|
|
};
|
|
preStart =
|
|
lib.concatStringsSep
|
|
"\n"
|
|
(lib.imap0
|
|
(idx: listener: makePasswordFile (listenerScope idx) listener.users "${cfg.dataDir}/passwd-${toString idx}")
|
|
cfg.listeners);
|
|
};
|
|
|
|
environment.etc = lib.listToAttrs (
|
|
lib.imap0
|
|
(idx: listener: {
|
|
name = "mosquitto/acl-${toString idx}.conf";
|
|
value = {
|
|
user = config.users.users.mosquitto.name;
|
|
group = config.users.users.mosquitto.group;
|
|
mode = "0400";
|
|
text = (lib.concatStringsSep
|
|
"\n"
|
|
(lib.flatten [
|
|
listener.acl
|
|
(lib.mapAttrsToList
|
|
(n: u: [ "user ${n}" ] ++ map (t: "topic ${t}") u.acl)
|
|
listener.users)
|
|
]));
|
|
};
|
|
})
|
|
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 = [ ];
|
|
doc = ./mosquitto.md;
|
|
};
|
|
}
|