749 lines
26 KiB
Nix
749 lines
26 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.tor;
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torDirectory = "/var/lib/tor";
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torRunDirectory = "/run/tor";
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opt = name: value: optionalString (value != null) "${name} ${value}";
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optint = name: value: optionalString (value != null && value != 0) "${name} ${toString value}";
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isolationOptions = {
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type = types.listOf (types.enum [
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"IsolateClientAddr"
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"IsolateSOCKSAuth"
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"IsolateClientProtocol"
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"IsolateDestPort"
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"IsolateDestAddr"
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]);
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default = [];
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example = [
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"IsolateClientAddr"
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"IsolateSOCKSAuth"
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"IsolateClientProtocol"
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"IsolateDestPort"
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"IsolateDestAddr"
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];
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description = "Tor isolation options";
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};
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torRc = ''
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User tor
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DataDirectory ${torDirectory}
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${optionalString cfg.enableGeoIP ''
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GeoIPFile ${pkgs.tor.geoip}/share/tor/geoip
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GeoIPv6File ${pkgs.tor.geoip}/share/tor/geoip6
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''}
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${optint "ControlPort" cfg.controlPort}
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${optionalString cfg.controlSocket.enable "ControlSocket ${torRunDirectory}/control GroupWritable RelaxDirModeCheck"}
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''
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# Client connection config
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+ optionalString cfg.client.enable ''
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SOCKSPort ${cfg.client.socksListenAddress} ${toString cfg.client.socksIsolationOptions}
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SOCKSPort ${cfg.client.socksListenAddressFaster}
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${opt "SocksPolicy" cfg.client.socksPolicy}
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${optionalString cfg.client.transparentProxy.enable ''
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TransPort ${cfg.client.transparentProxy.listenAddress} ${toString cfg.client.transparentProxy.isolationOptions}
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''}
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${optionalString cfg.client.dns.enable ''
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DNSPort ${cfg.client.dns.listenAddress} ${toString cfg.client.dns.isolationOptions}
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AutomapHostsOnResolve 1
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AutomapHostsSuffixes ${concatStringsSep "," cfg.client.dns.automapHostsSuffixes}
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''}
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''
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# Relay config
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+ optionalString cfg.relay.enable ''
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ORPort ${toString cfg.relay.port}
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${opt "Address" cfg.relay.address}
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${opt "Nickname" cfg.relay.nickname}
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${opt "ContactInfo" cfg.relay.contactInfo}
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${optint "RelayBandwidthRate" cfg.relay.bandwidthRate}
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${optint "RelayBandwidthBurst" cfg.relay.bandwidthBurst}
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${opt "AccountingMax" cfg.relay.accountingMax}
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${opt "AccountingStart" cfg.relay.accountingStart}
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${if (cfg.relay.role == "exit") then
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opt "ExitPolicy" cfg.relay.exitPolicy
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else
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"ExitPolicy reject *:*"}
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${optionalString (elem cfg.relay.role ["bridge" "private-bridge"]) ''
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BridgeRelay 1
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ServerTransportPlugin obfs2,obfs3 exec ${pkgs.pythonPackages.obfsproxy}/bin/obfsproxy managed
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ExtORPort auto
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${optionalString (cfg.relay.role == "private-bridge") ''
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ExtraInfoStatistics 0
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PublishServerDescriptor 0
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''}
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''}
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''
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# Hidden services
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+ concatStrings (flip mapAttrsToList cfg.hiddenServices (n: v: ''
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HiddenServiceDir ${torDirectory}/onion/${v.name}
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${flip concatMapStrings v.map (p: ''
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HiddenServicePort ${toString p.port} ${p.destination}
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'')}
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${optionalString (v.authorizeClient != null) ''
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HiddenServiceAuthorizeClient ${v.authorizeClient.authType} ${concatStringsSep "," v.authorizeClient.clientNames}
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''}
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''))
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+ cfg.extraConfig;
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torRcFile = pkgs.writeText "torrc" torRc;
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in
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{
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options = {
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services.tor = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable the Tor daemon. By default, the daemon is run without
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relay, exit, bridge or client connectivity.
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'';
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};
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enableGeoIP = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whenever to configure Tor daemon to use GeoIP databases.
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Disabling this will disable by-country statistics for
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bridges and relays and some client and third-party software
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functionality.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra configuration. Contents will be added verbatim to the
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configuration file at the end.
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'';
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};
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controlPort = mkOption {
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type = types.nullOr (types.either types.int types.str);
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default = null;
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example = 9051;
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description = ''
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If set, Tor will accept connections on the specified port
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and allow them to control the tor process.
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'';
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};
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controlSocket = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Wheter to enable Tor control socket. Control socket is created
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in <literal>${torRunDirectory}/control</literal>
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'';
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};
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};
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client = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable Tor daemon to route application
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connections. You might want to disable this if you plan
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running a dedicated Tor relay.
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'';
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};
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socksListenAddress = mkOption {
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type = types.str;
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default = "127.0.0.1:9050";
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example = "192.168.0.1:9100";
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description = ''
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Bind to this address to listen for connections from
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Socks-speaking applications. Provides strong circuit
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isolation, separate circuit per IP address.
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'';
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};
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socksListenAddressFaster = mkOption {
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type = types.str;
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default = "127.0.0.1:9063";
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example = "192.168.0.1:9101";
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description = ''
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Bind to this address to listen for connections from
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Socks-speaking applications. Same as
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<option>socksListenAddress</option> but uses weaker
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circuit isolation to provide performance suitable for a
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web browser.
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'';
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};
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socksPolicy = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "accept 192.168.0.0/16, reject *";
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description = ''
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Entry policies to allow/deny SOCKS requests based on IP
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address. First entry that matches wins. If no SocksPolicy
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is set, we accept all (and only) requests from
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<option>socksListenAddress</option>.
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'';
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};
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socksIsolationOptions = mkOption (isolationOptions // {
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default = ["IsolateDestAddr"];
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});
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transparentProxy = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable tor transaprent proxy";
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};
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listenAddress = mkOption {
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type = types.str;
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default = "127.0.0.1:9040";
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example = "192.168.0.1:9040";
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description = ''
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Bind transparent proxy to this address.
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'';
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};
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isolationOptions = mkOption isolationOptions;
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};
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dns = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable tor dns resolver";
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};
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listenAddress = mkOption {
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type = types.str;
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default = "127.0.0.1:9053";
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example = "192.168.0.1:9053";
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description = ''
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Bind tor dns to this address.
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'';
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};
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isolationOptions = mkOption isolationOptions;
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automapHostsSuffixes = mkOption {
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type = types.listOf types.str;
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default = [".onion" ".exit"];
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example = [".onion"];
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description = "List of suffixes to use with automapHostsOnResolve";
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};
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};
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privoxy.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable and configure the system Privoxy to use Tor's
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faster port, suitable for HTTP.
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To have anonymity, protocols need to be scrubbed of identifying
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information, and this can be accomplished for HTTP by Privoxy.
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Privoxy can also be useful for KDE torification. A good setup would be:
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setting SOCKS proxy to the default Tor port, providing maximum
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circuit isolation where possible; and setting HTTP proxy to Privoxy
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to route HTTP traffic over faster, but less isolated port.
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'';
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};
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};
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relay = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable relaying TOR traffic for others.
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See <link xlink:href="https://www.torproject.org/docs/tor-doc-relay" />
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for details.
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Setting this to true requires setting
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<option>services.tor.relay.role</option>
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and
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<option>services.tor.relay.port</option>
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options.
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'';
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};
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role = mkOption {
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type = types.enum [ "exit" "relay" "bridge" "private-bridge" ];
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description = ''
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Your role in Tor network. There're several options:
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<variablelist>
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<varlistentry>
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<term><literal>exit</literal></term>
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<listitem>
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<para>
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An exit relay. This allows Tor users to access regular
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Internet services through your public IP.
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</para>
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<important><para>
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Running an exit relay may expose you to abuse
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complaints. See
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<link xlink:href="https://www.torproject.org/faq.html.en#ExitPolicies" />
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for more info.
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</para></important>
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<para>
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You can specify which services Tor users may access via
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your exit relay using <option>exitPolicy</option> option.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>relay</literal></term>
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<listitem>
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<para>
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Regular relay. This allows Tor users to relay onion
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traffic to other Tor nodes, but not to public
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Internet.
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</para>
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<important><para>
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Note that some misconfigured and/or disrespectful
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towards privacy sites will block you even if your
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relay is not an exit relay. That is, just being listed
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in a public relay directory can have unwanted
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consequences.
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Which means you might not want to use
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this role if you browse public Internet from the same
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network as your relay, unless you want to write
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e-mails to those sites (you should!).
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</para></important>
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<para>
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See
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<link xlink:href="https://www.torproject.org/docs/tor-doc-relay.html.en" />
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for more info.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>bridge</literal></term>
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<listitem>
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<para>
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Regular bridge. Works like a regular relay, but
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doesn't list you in the public relay directory and
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hides your Tor node behind obfsproxy.
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</para>
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<para>
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Using this option will make Tor advertise your bridge
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to users through various mechanisms like
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<link xlink:href="https://bridges.torproject.org/" />, though.
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</para>
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<important>
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<para>
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WARNING: THE FOLLOWING PARAGRAPH IS NOT LEGAL ADVISE.
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Consult with your lawer when in doubt.
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</para>
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<para>
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This role should be safe to use in most situations
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(unless the act of forwarding traffic for others is
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a punishable offence under your local laws, which
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would be pretty insane as it would make ISP
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illegal).
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</para>
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</important>
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<para>
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See <link xlink:href="https://www.torproject.org/docs/bridges.html.en" />
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for more info.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>private-bridge</literal></term>
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<listitem>
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<para>
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Private bridge. Works like regular bridge, but does
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not advertise your node in any way.
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</para>
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<para>
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Using this role means that you won't contribute to Tor
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network in any way unless you advertise your node
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yourself in some way.
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</para>
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<para>
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Use this if you want to run a private bridge, for
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example because you'll give out your bridge address
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manually to your friends.
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</para>
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<para>
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Switching to this role after measurable time in
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"bridge" role is pretty useless as some Tor users
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would have learned about your node already. In the
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latter case you can still change
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<option>port</option> option.
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</para>
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<para>
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See <link xlink:href="https://www.torproject.org/docs/bridges.html.en" />
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for more info.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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'';
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};
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nickname = mkOption {
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type = types.str;
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default = "anonymous";
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description = ''
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A unique handle for your TOR relay.
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'';
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};
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contactInfo = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "admin@relay.com";
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description = ''
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Contact information for the relay owner (e.g. a mail
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address and GPG key ID).
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'';
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};
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accountingMax = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "450 GBytes";
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description = ''
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Specify maximum bandwidth allowed during an accounting period. This
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allows you to limit overall tor bandwidth over some time period.
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See the <literal>AccountingMax</literal> option by looking at the
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tor manual <citerefentry><refentrytitle>tor</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry> for more.
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Note this limit applies individually to upload and
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download; if you specify <literal>"500 GBytes"</literal>
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here, then you may transfer up to 1 TBytes of overall
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bandwidth (500 GB upload, 500 GB download).
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'';
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};
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accountingStart = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "month 1 1:00";
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description = ''
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Specify length of an accounting period. This allows you to limit
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overall tor bandwidth over some time period. See the
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<literal>AccountingStart</literal> option by looking at the tor
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manual <citerefentry><refentrytitle>tor</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry> for more.
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'';
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};
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bandwidthRate = mkOption {
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type = types.nullOr types.int;
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default = null;
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example = 100;
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description = ''
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Specify this to limit the bandwidth usage of relayed (server)
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traffic. Your own traffic is still unthrottled. Units: bytes/second.
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'';
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};
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bandwidthBurst = mkOption {
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type = types.nullOr types.int;
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default = cfg.relay.bandwidthRate;
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example = 200;
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description = ''
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Specify this to allow bursts of the bandwidth usage of relayed (server)
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traffic. The average usage will still be as specified in relayBandwidthRate.
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Your own traffic is still unthrottled. Units: bytes/second.
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'';
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};
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address = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "noname.example.com";
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description = ''
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The IP address or full DNS name for advertised address of your relay.
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Leave unset and Tor will guess.
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'';
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};
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port = mkOption {
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type = types.either types.int types.str;
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example = 143;
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description = ''
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What port to advertise for Tor connections. This corresponds to the
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<literal>ORPort</literal> section in the Tor manual; see
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<citerefentry><refentrytitle>tor</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry> for more details.
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At a minimum, you should just specify the port for the
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relay to listen on; a common one like 143, 22, 80, or 443
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to help Tor users who may have very restrictive port-based
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firewalls.
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'';
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};
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exitPolicy = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "accept *:6660-6667,reject *:*";
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description = ''
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A comma-separated list of exit policies. They're
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considered first to last, and the first match wins. If you
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want to _replace_ the default exit policy, end this with
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either a reject *:* or an accept *:*. Otherwise, you're
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_augmenting_ (prepending to) the default exit policy.
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Leave commented to just use the default, which is
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available in the man page or at
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<link xlink:href="https://www.torproject.org/documentation.html" />.
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Look at
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<link xlink:href="https://www.torproject.org/faq-abuse.html#TypicalAbuses" />
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for issues you might encounter if you use the default
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exit policy.
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If certain IPs and ports are blocked externally, e.g. by
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your firewall, you should update your exit policy to
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reflect this -- otherwise Tor users will be told that
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those destinations are down.
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'';
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};
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};
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|
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hiddenServices = mkOption {
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description = ''
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A set of static hidden services that terminate their Tor
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circuits at this node.
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Every element in this set declares a virtual onion host.
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You can specify your onion address by putting corresponding
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private key to an appropriate place in ${torDirectory}.
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For services without private keys in ${torDirectory} Tor
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daemon will generate random key pairs (which implies random
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onion addresses) on restart. The latter could take a while,
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please be patient.
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|
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<note><para>
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Hidden services can be useful even if you don't intend to
|
|
actually <emphasis>hide</emphasis> them, since they can
|
|
also be seen as a kind of NAT traversal mechanism.
|
|
|
|
E.g. the example will make your sshd, whatever runs on
|
|
"8080" and your mail server available from anywhere where
|
|
the Tor network is available (which, with the help from
|
|
bridges, is pretty much everywhere), even if both client
|
|
and server machines are behind NAT you have no control
|
|
over.
|
|
</para></note>
|
|
'';
|
|
default = {};
|
|
example = literalExample ''
|
|
{ "my-hidden-service-example".map = [
|
|
{ port = 22; } # map ssh port to this machine's ssh
|
|
{ port = 80; toPort = 8080; } # map http port to whatever runs on 8080
|
|
{ port = "sip"; toHost = "mail.example.com"; toPort = "imap"; } # because we can
|
|
];
|
|
}
|
|
'';
|
|
type = types.loaOf (types.submodule ({name, config, ...}: {
|
|
options = {
|
|
|
|
name = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
Name of this tor hidden service.
|
|
|
|
This is purely descriptive.
|
|
|
|
After restarting Tor daemon you should be able to
|
|
find your .onion address in
|
|
<literal>${torDirectory}/onion/$name/hostname</literal>.
|
|
'';
|
|
};
|
|
|
|
map = mkOption {
|
|
default = [];
|
|
description = "Port mapping for this hidden service.";
|
|
type = types.listOf (types.submodule ({config, ...}: {
|
|
options = {
|
|
|
|
port = mkOption {
|
|
type = types.either types.int types.str;
|
|
example = 80;
|
|
description = ''
|
|
Hidden service port to "bind to".
|
|
'';
|
|
};
|
|
|
|
destination = mkOption {
|
|
internal = true;
|
|
type = types.str;
|
|
description = "Forward these connections where?";
|
|
};
|
|
|
|
toHost = mkOption {
|
|
type = types.str;
|
|
default = "127.0.0.1";
|
|
description = "Mapping destination host.";
|
|
};
|
|
|
|
toPort = mkOption {
|
|
type = types.either types.int types.str;
|
|
example = 8080;
|
|
description = "Mapping destination port.";
|
|
};
|
|
|
|
};
|
|
|
|
config = {
|
|
toPort = mkDefault config.port;
|
|
destination = mkDefault "${config.toHost}:${toString config.toPort}";
|
|
};
|
|
}));
|
|
};
|
|
|
|
authorizeClient = mkOption {
|
|
default = null;
|
|
description = "If configured, the hidden service is accessible for authorized clients only.";
|
|
type = types.nullOr (types.submodule ({config, ...}: {
|
|
|
|
options = {
|
|
|
|
authType = mkOption {
|
|
type = types.enum [ "basic" "stealth" ];
|
|
description = ''
|
|
Either <literal>"basic"</literal> for a general-purpose authorization protocol
|
|
or <literal>"stealth"</literal> for a less scalable protocol
|
|
that also hides service activity from unauthorized clients.
|
|
'';
|
|
};
|
|
|
|
clientNames = mkOption {
|
|
type = types.nonEmptyListOf (types.strMatching "[A-Za-z0-9+-_]+");
|
|
description = ''
|
|
Only clients that are listed here are authorized to access the hidden service.
|
|
Generated authorization data can be found in <filename>${torDirectory}/onion/$name/hostname</filename>.
|
|
Clients need to put this authorization data in their configuration file using <literal>HidServAuth</literal>.
|
|
'';
|
|
};
|
|
};
|
|
}));
|
|
};
|
|
};
|
|
|
|
config = {
|
|
name = mkDefault name;
|
|
};
|
|
}));
|
|
};
|
|
};
|
|
};
|
|
|
|
config = mkIf cfg.enable {
|
|
# Not sure if `cfg.relay.role == "private-bridge"` helps as tor
|
|
# sends a lot of stats
|
|
warnings = optional (cfg.relay.enable && cfg.hiddenServices != {})
|
|
''
|
|
Running Tor hidden services on a public relay makes the
|
|
presence of hidden services visible through simple statistical
|
|
analysis of publicly available data.
|
|
|
|
You can safely ignore this warning if you don't intend to
|
|
actually hide your hidden services. In either case, you can
|
|
always create a container/VM with a separate Tor daemon instance.
|
|
'';
|
|
|
|
users.extraGroups.tor.gid = config.ids.gids.tor;
|
|
users.extraUsers.tor =
|
|
{ description = "Tor Daemon User";
|
|
createHome = true;
|
|
home = torDirectory;
|
|
group = "tor";
|
|
uid = config.ids.uids.tor;
|
|
};
|
|
|
|
systemd.services.tor =
|
|
{ description = "Tor Daemon";
|
|
path = [ pkgs.tor ];
|
|
|
|
wantedBy = [ "multi-user.target" ];
|
|
after = [ "network.target" ];
|
|
restartTriggers = [ torRcFile ];
|
|
|
|
serviceConfig =
|
|
{ Type = "simple";
|
|
# Translated from the upstream contrib/dist/tor.service.in
|
|
ExecStartPre = "${pkgs.tor}/bin/tor -f ${torRcFile} --verify-config";
|
|
ExecStart = "${pkgs.tor}/bin/tor -f ${torRcFile} --RunAsDaemon 0";
|
|
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
|
|
KillSignal = "SIGINT";
|
|
TimeoutSec = 30;
|
|
Restart = "on-failure";
|
|
LimitNOFILE = 32768;
|
|
|
|
# Hardening
|
|
# Note: DevicePolicy is set to 'closed', although the
|
|
# minimal permissions are really:
|
|
# DeviceAllow /dev/null rw
|
|
# DeviceAllow /dev/urandom r
|
|
# .. but we can't specify DeviceAllow multiple times. 'closed'
|
|
# is close enough.
|
|
RuntimeDirectory = "tor";
|
|
StateDirectory = [ "tor" "tor/onion" ];
|
|
PrivateTmp = "yes";
|
|
DevicePolicy = "closed";
|
|
InaccessibleDirectories = "/home";
|
|
ReadOnlyDirectories = "/";
|
|
ReadWriteDirectories = [torDirectory torRunDirectory];
|
|
NoNewPrivileges = "yes";
|
|
};
|
|
};
|
|
|
|
environment.systemPackages = [ pkgs.tor ];
|
|
|
|
services.privoxy = mkIf (cfg.client.enable && cfg.client.privoxy.enable) {
|
|
enable = true;
|
|
extraConfig = ''
|
|
forward-socks4a / ${cfg.client.socksListenAddressFaster} .
|
|
toggle 1
|
|
enable-remote-toggle 0
|
|
enable-edit-actions 0
|
|
enable-remote-http-toggle 0
|
|
'';
|
|
};
|
|
};
|
|
}
|