29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
324 lines
10 KiB
Nix
324 lines
10 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) tor privoxy;
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stateDir = "/var/lib/tor";
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privoxyDir = stateDir+"/privoxy";
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cfg = config.services.tor;
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torUser = "tor";
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opt = name: value: if value != "" then "${name} ${value}" else "";
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optint = name: value: if value != 0 then "${name} ${toString value}" else "";
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in
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{
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###### interface
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options = {
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services.tor = {
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config = mkOption {
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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.
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'';
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};
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client = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable Tor daemon to route application connections.
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You might want to disable this if you plan running a dedicated Tor relay.
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'';
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};
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socksListenAddress = mkOption {
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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 Socks-speaking
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applications.
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'';
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};
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socksListenAddressFaster = mkOption {
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default = "127.0.0.1:9063";
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description = ''
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Same as socksListenAddress but uses weaker circuit isolation to provide
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performance suitable for a web browser.
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'';
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};
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socksPolicy = mkOption {
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default = "";
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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 address.
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First entry that matches wins. If no SocksPolicy is set, we accept
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all (and only) requests from SocksListenAddress.
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'';
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};
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privoxy = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to enable a special instance of privoxy dedicated to Tor.
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To have anonymity, protocols need to be scrubbed of identifying
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information.
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Most people using Tor want to anonymize their web traffic, so by
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default we enable an special instance of privoxy specifically for
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Tor.
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However, if you are only going to use Tor only for other kinds of
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traffic then you can disable this option.
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'';
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};
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listenAddress = mkOption {
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default = "127.0.0.1:8118";
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description = ''
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Address that Tor's instance of privoxy is listening to.
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*This does not configure the standard NixOS instance of privoxy.*
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This is for Tor connections only!
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See services.privoxy.listenAddress to configure the standard NixOS
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instace of privoxy.
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'';
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};
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config = mkOption {
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default = "";
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description = ''
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Extra configuration for Tor's instance of privoxy. Contents will be
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added verbatim to the configuration file.
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*This does not configure the standard NixOS instance of privoxy.*
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This is for Tor connections only!
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See services.privoxy.extraConfig to configure the standard NixOS
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instace of privoxy.
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'';
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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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default = false;
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description = ''
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Whether to enable relaying TOR traffic for others.
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See https://www.torproject.org/docs/tor-doc-relay for details.
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'';
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};
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isBridge = mkOption {
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default = false;
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description = ''
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Bridge relays (or "bridges" ) are Tor relays that aren't listed in the
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main directory. Since there is no complete public list of them, even if an
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ISP is filtering connections to all the known Tor relays, they probably
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won't be able to block all the bridges.
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A bridge relay can't be an exit relay.
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You need to set relay.enable to true for this option to take effect.
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The bridge is set up with an obfuscated transport proxy.
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See https://www.torproject.org/bridges.html.en for more info.
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'';
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};
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isExit = mkOption {
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default = false;
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description = ''
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An exit relay allows Tor users to access regular Internet services.
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Unlike running a non-exit relay, running an exit relay may expose
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you to abuse complaints. See https://www.torproject.org/faq.html.en#ExitPolicies for more info.
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You can specify which services Tor users may access via your exit relay using exitPolicy option.
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'';
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};
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nickname = mkOption {
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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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bandwidthRate = mkOption {
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default = 0;
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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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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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port = mkOption {
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default = 9001;
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description = ''
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What port to advertise for Tor connections.
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'';
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};
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listenAddress = mkOption {
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default = "";
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example = "0.0.0.0:9090";
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description = ''
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Set this if you need to listen on a port other than the one advertised
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in relayPort (e.g. to advertise 443 but bind to 9090). You'll need to do
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ipchains or other port forwsarding yourself to make this work.
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'';
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};
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exitPolicy = mkOption {
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default = "";
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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 considered first
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to last, and the first match wins. If you want to _replace_
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the default exit policy, end this with either a reject *:* or an
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accept *:*. Otherwise, you're _augmenting_ (prepending to) the
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default exit policy. Leave commented to just use the default, which is
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available in the man page or at https://www.torproject.org/documentation.html
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Look at https://www.torproject.org/faq-abuse.html#TypicalAbuses
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for issues you might encounter if you use the default exit policy.
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If certain IPs and ports are blocked externally, e.g. by your firewall,
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you should update your exit policy to reflect this -- otherwise Tor
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users will be told that those destinations are down.
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'';
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};
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};
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};
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};
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###### implementation
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config = mkIf (cfg.client.enable || cfg.relay.enable) {
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assertions = singleton
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{ assertion = cfg.relay.enable -> !(cfg.relay.isBridge && cfg.relay.isExit);
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message = "Can't be both an exit and a bridge relay at the same time";
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};
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users.extraUsers = singleton
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{ name = torUser;
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uid = config.ids.uids.tor;
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description = "Tor daemon user";
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home = stateDir;
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};
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jobs = {
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tor = { name = "tor";
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startOn = "started network-interfaces";
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stopOn = "stopping network-interfaces";
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preStart = ''
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mkdir -m 0755 -p ${stateDir}
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chown ${torUser} ${stateDir}
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'';
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exec = "${tor}/bin/tor -f ${pkgs.writeText "torrc" cfg.config}";
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}; }
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// optionalAttrs (cfg.client.privoxy.enable && cfg.client.enable) {
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torPrivoxy = { name = "tor-privoxy";
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startOn = "started network-interfaces";
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stopOn = "stopping network-interfaces";
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preStart = ''
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mkdir -m 0755 -p ${privoxyDir}
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chown ${torUser} ${privoxyDir}
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'';
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exec = "${privoxy}/sbin/privoxy --no-daemon --user ${torUser} ${pkgs.writeText "torPrivoxy.conf" cfg.client.privoxy.config}";
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}; };
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services.tor.config = ''
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DataDirectory ${stateDir}
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User ${torUser}
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''
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+ optionalString cfg.client.enable ''
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SOCKSPort ${cfg.client.socksListenAddress} IsolateDestAddr
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SOCKSPort ${cfg.client.socksListenAddressFaster}
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${opt "SocksPolicy" cfg.client.socksPolicy}
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''
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+ optionalString cfg.relay.enable ''
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ORPort ${toString cfg.relay.port}
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${opt "ORListenAddress" cfg.relay.listenAddress }
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${opt "Nickname" cfg.relay.nickname}
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${optint "RelayBandwidthRate" cfg.relay.bandwidthRate}
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${optint "RelayBandwidthBurst" cfg.relay.bandwidthBurst}
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${if cfg.relay.isExit then opt "ExitPolicy" cfg.relay.exitPolicy else "ExitPolicy reject *:*"}
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${if cfg.relay.isBridge then ''
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BridgeRelay 1
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ServerTransportPlugin obfs2,obfs3 exec ${pkgs.pythonPackages.obfsproxy}/bin/obfsproxy managed
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'' else ""}
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'';
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services.tor.client.privoxy.config = ''
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# Generally, this file goes in /etc/privoxy/config
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#
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# Tor listens as a SOCKS4a proxy here:
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forward-socks4a / ${cfg.client.socksListenAddressFaster} .
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confdir ${privoxy}/etc
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logdir ${privoxyDir}
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# actionsfile standard # Internal purpose, recommended
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actionsfile default.action # Main actions file
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actionsfile user.action # User customizations
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filterfile default.filter
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# Don't log interesting things, only startup messages, warnings and errors
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logfile logfile
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#jarfile jarfile
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#debug 0 # show each GET/POST/CONNECT request
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debug 4096 # Startup banner and warnings
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debug 8192 # Errors - *we highly recommended enabling this*
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user-manual ${privoxy}/doc/privoxy/user-manual
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listen-address ${cfg.client.privoxy.listenAddress}
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toggle 1
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enable-remote-toggle 0
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enable-edit-actions 0
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enable-remote-http-toggle 0
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buffer-limit 4096
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# Extra config goes here
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'';
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};
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}
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