{ lib, pkgs, config, options, ... }: let cfg = config.services.mastodon; opt = options.services.mastodon; # We only want to create a database if we're actually going to connect to it. databaseActuallyCreateLocally = cfg.database.createLocally && cfg.database.host == "/run/postgresql"; env = { RAILS_ENV = "production"; NODE_ENV = "production"; LD_PRELOAD = "${pkgs.jemalloc}/lib/libjemalloc.so"; # mastodon-web concurrency. WEB_CONCURRENCY = toString cfg.webProcesses; MAX_THREADS = toString cfg.webThreads; # mastodon-streaming concurrency. STREAMING_CLUSTER_NUM = toString cfg.streamingProcesses; DB_USER = cfg.database.user; REDIS_HOST = cfg.redis.host; REDIS_PORT = toString(cfg.redis.port); DB_HOST = cfg.database.host; DB_NAME = cfg.database.name; LOCAL_DOMAIN = cfg.localDomain; SMTP_SERVER = cfg.smtp.host; SMTP_PORT = toString(cfg.smtp.port); SMTP_FROM_ADDRESS = cfg.smtp.fromAddress; PAPERCLIP_ROOT_PATH = "/var/lib/mastodon/public-system"; PAPERCLIP_ROOT_URL = "/system"; ES_ENABLED = if (cfg.elasticsearch.host != null) then "true" else "false"; ES_HOST = cfg.elasticsearch.host; ES_PORT = toString(cfg.elasticsearch.port); TRUSTED_PROXY_IP = cfg.trustedProxy; } // lib.optionalAttrs (cfg.database.host != "/run/postgresql" && cfg.database.port != null) { DB_PORT = toString cfg.database.port; } // lib.optionalAttrs cfg.smtp.authenticate { SMTP_LOGIN = cfg.smtp.user; } // cfg.extraConfig; systemCallsList = [ "@cpu-emulation" "@debug" "@keyring" "@ipc" "@mount" "@obsolete" "@privileged" "@setuid" ]; cfgService = { # User and group User = cfg.user; Group = cfg.group; # State directory and mode StateDirectory = "mastodon"; StateDirectoryMode = "0750"; # Logs directory and mode LogsDirectory = "mastodon"; LogsDirectoryMode = "0750"; # Proc filesystem ProcSubset = "pid"; ProtectProc = "invisible"; # Access write directories UMask = "0027"; # Capabilities CapabilityBoundingSet = ""; # Security NoNewPrivileges = true; # Sandboxing ProtectSystem = "strict"; ProtectHome = true; PrivateTmp = true; PrivateDevices = true; PrivateUsers = true; ProtectClock = true; ProtectHostname = true; ProtectKernelLogs = true; ProtectKernelModules = true; ProtectKernelTunables = true; ProtectControlGroups = true; RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" "AF_NETLINK" ]; RestrictNamespaces = true; LockPersonality = true; MemoryDenyWriteExecute = false; RestrictRealtime = true; RestrictSUIDSGID = true; RemoveIPC = true; PrivateMounts = true; # System Call Filtering SystemCallArchitectures = "native"; }; envFile = pkgs.writeText "mastodon.env" (lib.concatMapStrings (s: s + "\n") ( (lib.concatLists (lib.mapAttrsToList (name: value: if value != null then [ "${name}=\"${toString value}\"" ] else [] ) env)))); mastodonTootctl = pkgs.writeShellScriptBin "mastodon-tootctl" '' set -a export RAILS_ROOT="${cfg.package}" source "${envFile}" source /var/lib/mastodon/.secrets_env sudo=exec if [[ "$USER" != ${cfg.user} ]]; then sudo='exec /run/wrappers/bin/sudo -u ${cfg.user} --preserve-env' fi $sudo ${cfg.package}/bin/tootctl "$@" ''; in { options = { services.mastodon = { enable = lib.mkEnableOption (lib.mdDoc "Mastodon, a federated social network server"); configureNginx = lib.mkOption { description = lib.mdDoc '' Configure nginx as a reverse proxy for mastodon. Note that this makes some assumptions on your setup, and sets settings that will affect other virtualHosts running on your nginx instance, if any. Alternatively you can configure a reverse-proxy of your choice to serve these paths: `/ -> $(nix-instantiate --eval '' -A mastodon.outPath)/public` `/ -> 127.0.0.1:{{ webPort }} `(If there was no file in the directory above.) `/system/ -> /var/lib/mastodon/public-system/` `/api/v1/streaming/ -> 127.0.0.1:{{ streamingPort }}` Make sure that websockets are forwarded properly. You might want to set up caching of some requests. Take a look at mastodon's provided nginx configuration at `https://github.com/mastodon/mastodon/blob/master/dist/nginx.conf`. ''; type = lib.types.bool; default = false; }; user = lib.mkOption { description = lib.mdDoc '' User under which mastodon runs. If it is set to "mastodon", that user will be created, otherwise it should be set to the name of a user created elsewhere. In both cases, the `mastodon` package will be added to the user's package set and a tootctl wrapper to system packages that switches to the configured account and load the right environment. ''; type = lib.types.str; default = "mastodon"; }; group = lib.mkOption { description = lib.mdDoc '' Group under which mastodon runs. ''; type = lib.types.str; default = "mastodon"; }; streamingPort = lib.mkOption { description = lib.mdDoc "TCP port used by the mastodon-streaming service."; type = lib.types.port; default = 55000; }; streamingProcesses = lib.mkOption { description = lib.mdDoc '' Processes used by the mastodon-streaming service. Defaults to the number of CPU cores minus one. ''; type = lib.types.nullOr lib.types.int; default = null; }; webPort = lib.mkOption { description = lib.mdDoc "TCP port used by the mastodon-web service."; type = lib.types.port; default = 55001; }; webProcesses = lib.mkOption { description = lib.mdDoc "Processes used by the mastodon-web service."; type = lib.types.int; default = 2; }; webThreads = lib.mkOption { description = lib.mdDoc "Threads per process used by the mastodon-web service."; type = lib.types.int; default = 5; }; sidekiqPort = lib.mkOption { description = lib.mdDoc "TCP port used by the mastodon-sidekiq service."; type = lib.types.port; default = 55002; }; sidekiqThreads = lib.mkOption { description = lib.mdDoc "Worker threads used by the mastodon-sidekiq service."; type = lib.types.int; default = 25; }; vapidPublicKeyFile = lib.mkOption { description = lib.mdDoc '' Path to file containing the public key used for Web Push Voluntary Application Server Identification. A new keypair can be generated by running: `nix build -f '' mastodon; cd result; bin/rake webpush:generate_keys` If {option}`mastodon.vapidPrivateKeyFile`does not exist, it and this file will be created with a new keypair. ''; default = "/var/lib/mastodon/secrets/vapid-public-key"; type = lib.types.str; }; localDomain = lib.mkOption { description = lib.mdDoc "The domain serving your Mastodon instance."; example = "social.example.org"; type = lib.types.str; }; secretKeyBaseFile = lib.mkOption { description = lib.mdDoc '' Path to file containing the secret key base. A new secret key base can be generated by running: `nix build -f '' mastodon; cd result; bin/rake secret` If this file does not exist, it will be created with a new secret key base. ''; default = "/var/lib/mastodon/secrets/secret-key-base"; type = lib.types.str; }; otpSecretFile = lib.mkOption { description = lib.mdDoc '' Path to file containing the OTP secret. A new OTP secret can be generated by running: `nix build -f '' mastodon; cd result; bin/rake secret` If this file does not exist, it will be created with a new OTP secret. ''; default = "/var/lib/mastodon/secrets/otp-secret"; type = lib.types.str; }; vapidPrivateKeyFile = lib.mkOption { description = lib.mdDoc '' Path to file containing the private key used for Web Push Voluntary Application Server Identification. A new keypair can be generated by running: `nix build -f '' mastodon; cd result; bin/rake webpush:generate_keys` If this file does not exist, it will be created with a new private key. ''; default = "/var/lib/mastodon/secrets/vapid-private-key"; type = lib.types.str; }; trustedProxy = lib.mkOption { description = lib.mdDoc '' You need to set it to the IP from which your reverse proxy sends requests to Mastodon's web process, otherwise Mastodon will record the reverse proxy's own IP as the IP of all requests, which would be bad because IP addresses are used for important rate limits and security functions. ''; type = lib.types.str; default = "127.0.0.1"; }; enableUnixSocket = lib.mkOption { description = lib.mdDoc '' Instead of binding to an IP address like 127.0.0.1, you may bind to a Unix socket. This variable is process-specific, e.g. you need different values for every process, and it works for both web (Puma) processes and streaming API (Node.js) processes. ''; type = lib.types.bool; default = true; }; redis = { createLocally = lib.mkOption { description = lib.mdDoc "Configure local Redis server for Mastodon."; type = lib.types.bool; default = true; }; host = lib.mkOption { description = lib.mdDoc "Redis host."; type = lib.types.str; default = "127.0.0.1"; }; port = lib.mkOption { description = lib.mdDoc "Redis port."; type = lib.types.port; default = 31637; }; }; database = { createLocally = lib.mkOption { description = lib.mdDoc "Configure local PostgreSQL database server for Mastodon."; type = lib.types.bool; default = true; }; host = lib.mkOption { type = lib.types.str; default = "/run/postgresql"; example = "192.168.23.42"; description = lib.mdDoc "Database host address or unix socket."; }; port = lib.mkOption { type = lib.types.nullOr lib.types.port; default = if cfg.database.createLocally then null else 5432; defaultText = lib.literalExpression '' if config.${opt.database.createLocally} then null else 5432 ''; description = lib.mdDoc "Database host port."; }; name = lib.mkOption { type = lib.types.str; default = "mastodon"; description = lib.mdDoc "Database name."; }; user = lib.mkOption { type = lib.types.str; default = "mastodon"; description = lib.mdDoc "Database user."; }; passwordFile = lib.mkOption { type = lib.types.nullOr lib.types.path; default = null; example = "/var/lib/mastodon/secrets/db-password"; description = lib.mdDoc '' A file containing the password corresponding to {option}`database.user`. ''; }; }; smtp = { createLocally = lib.mkOption { description = lib.mdDoc "Configure local Postfix SMTP server for Mastodon."; type = lib.types.bool; default = true; }; authenticate = lib.mkOption { description = lib.mdDoc "Authenticate with the SMTP server using username and password."; type = lib.types.bool; default = false; }; host = lib.mkOption { description = lib.mdDoc "SMTP host used when sending emails to users."; type = lib.types.str; default = "127.0.0.1"; }; port = lib.mkOption { description = lib.mdDoc "SMTP port used when sending emails to users."; type = lib.types.port; default = 25; }; fromAddress = lib.mkOption { description = lib.mdDoc ''"From" address used when sending Emails to users.''; type = lib.types.str; }; user = lib.mkOption { type = lib.types.nullOr lib.types.str; default = null; example = "mastodon@example.com"; description = lib.mdDoc "SMTP login name."; }; passwordFile = lib.mkOption { type = lib.types.nullOr lib.types.path; default = null; example = "/var/lib/mastodon/secrets/smtp-password"; description = lib.mdDoc '' Path to file containing the SMTP password. ''; }; }; elasticsearch = { host = lib.mkOption { description = lib.mdDoc '' Elasticsearch host. If it is not null, Elasticsearch full text search will be enabled. ''; type = lib.types.nullOr lib.types.str; default = null; }; port = lib.mkOption { description = lib.mdDoc "Elasticsearch port."; type = lib.types.port; default = 9200; }; }; package = lib.mkOption { type = lib.types.package; default = pkgs.mastodon; defaultText = lib.literalExpression "pkgs.mastodon"; description = lib.mdDoc "Mastodon package to use."; }; extraConfig = lib.mkOption { type = lib.types.attrs; default = {}; description = lib.mdDoc '' Extra environment variables to pass to all mastodon services. ''; }; automaticMigrations = lib.mkOption { type = lib.types.bool; default = true; description = lib.mdDoc '' Do automatic database migrations. ''; }; mediaAutoRemove = { enable = lib.mkOption { type = lib.types.bool; default = true; example = false; description = lib.mdDoc '' Automatically remove remote media attachments and preview cards older than the configured amount of days. Recommended in https://docs.joinmastodon.org/admin/setup/. ''; }; startAt = lib.mkOption { type = lib.types.str; default = "daily"; example = "hourly"; description = lib.mdDoc '' How often to remove remote media. The format is described in {manpage}`systemd.time(7)`. ''; }; olderThanDays = lib.mkOption { type = lib.types.int; default = 30; example = 14; description = lib.mdDoc '' How old remote media needs to be in order to be removed. ''; }; }; }; }; config = lib.mkIf cfg.enable { assertions = [ { assertion = databaseActuallyCreateLocally -> (cfg.user == cfg.database.user); message = '' For local automatic database provisioning (services.mastodon.database.createLocally == true) with peer authentication (services.mastodon.database.host == "/run/postgresql") to work services.mastodon.user and services.mastodon.database.user must be identical. ''; } { assertion = !databaseActuallyCreateLocally -> (cfg.database.host != "/run/postgresql"); message = '' needs to be set if is not enabled. ''; } { assertion = cfg.smtp.authenticate -> (cfg.smtp.user != null); message = '' needs to be set if is enabled. ''; } { assertion = cfg.smtp.authenticate -> (cfg.smtp.passwordFile != null); message = '' needs to be set if is enabled. ''; } ]; environment.systemPackages = [ mastodonTootctl ]; systemd.services.mastodon-init-dirs = { script = '' umask 077 if ! test -f ${cfg.secretKeyBaseFile}; then mkdir -p $(dirname ${cfg.secretKeyBaseFile}) bin/rake secret > ${cfg.secretKeyBaseFile} fi if ! test -f ${cfg.otpSecretFile}; then mkdir -p $(dirname ${cfg.otpSecretFile}) bin/rake secret > ${cfg.otpSecretFile} fi if ! test -f ${cfg.vapidPrivateKeyFile}; then mkdir -p $(dirname ${cfg.vapidPrivateKeyFile}) $(dirname ${cfg.vapidPublicKeyFile}) keypair=$(bin/rake webpush:generate_keys) echo $keypair | grep --only-matching "Private -> [^ ]\+" | sed 's/^Private -> //' > ${cfg.vapidPrivateKeyFile} echo $keypair | grep --only-matching "Public -> [^ ]\+" | sed 's/^Public -> //' > ${cfg.vapidPublicKeyFile} fi cat > /var/lib/mastodon/.secrets_env < $PGPASSFILE <