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nixpkgs/modules/services/security/tor.nix

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Nix

{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (pkgs) tor privoxy;
stateDir = "/var/lib/tor";
privoxyDir = stateDir+"/privoxy";
cfg = config.services.tor;
torUser = "tor";
opt = name: value: if value != "" then "${name} ${value}" else "";
optint = name: value: if value != 0 then "${name} ${toString value}" else "";
in
{
###### interface
options = {
services.tor = {
config = mkOption {
default = "";
description = ''
Extra configuration. Contents will be added verbatim to the
configuration file.
'';
};
client = {
enable = mkOption {
default = false;
description = ''
Whether to enable Tor daemon to route application connections.
You might want to disable this if you plan running a dedicated Tor relay.
'';
};
socksListenAddress = mkOption {
default = "127.0.0.1:9050";
example = "192.168.0.1:9100";
description = ''
Bind to this address to listen for connections from Socks-speaking
applications.
'';
};
socksListenAddressFaster = mkOption {
default = "127.0.0.1:9063";
description = ''
Same as socksListenAddress but uses weaker circuit isolation to provide
performance suitable for a web browser.
'';
};
socksPolicy = mkOption {
default = "";
example = "accept 192.168.0.0/16, reject *";
description = ''
Entry policies to allow/deny SOCKS requests based on IP address.
First entry that matches wins. If no SocksPolicy is set, we accept
all (and only) requests from SocksListenAddress.
'';
};
privoxy = {
enable = mkOption {
default = true;
description = ''
Whether to enable a special instance of privoxy dedicated to Tor.
To have anonymity, protocols need to be scrubbed of identifying
information.
Most people using Tor want to anonymize their web traffic, so by
default we enable an special instance of privoxy specifically for
Tor.
However, if you are only going to use Tor only for other kinds of
traffic then you can disable this option.
'';
};
listenAddress = mkOption {
default = "127.0.0.1:8118";
description = ''
Address that Tor's instance of privoxy is listening to.
*This does not configure the standard NixOS instance of privoxy.*
This is for Tor connections only!
See services.privoxy.listenAddress to configure the standard NixOS
instace of privoxy.
'';
};
config = mkOption {
default = "";
description = ''
Extra configuration for Tor's instance of privoxy. Contents will be
added verbatim to the configuration file.
*This does not configure the standard NixOS instance of privoxy.*
This is for Tor connections only!
See services.privoxy.extraConfig to configure the standard NixOS
instace of privoxy.
'';
};
};
};
relay = {
enable = mkOption {
default = false;
description = ''
Whether to enable relaying TOR traffic for others.
See https://www.torproject.org/docs/tor-doc-relay for details.
'';
};
isBridge = mkOption {
default = false;
description = ''
Bridge relays (or "bridges" ) are Tor relays that aren't listed in the
main directory. Since there is no complete public list of them, even if an
ISP is filtering connections to all the known Tor relays, they probably
won't be able to block all the bridges.
A bridge relay can't be an exit relay.
You need to set enableRelay to true for this option to take effect.
See https://www.torproject.org/bridges.html.en for more info.
'';
};
isExit = mkOption {
default = false;
description = ''
An exit relay allows Tor users to access regular Internet services.
Unlike running a non-exit relay, running an exit relay may expose
you to abuse complaints. See https://www.torproject.org/faq.html.en#ExitPolicies for more info.
You can specify which services Tor users may access via your exit relay using exitPolicy option.
'';
};
nickname = mkOption {
default = "anonymous";
description = ''
A unique handle for your TOR relay.
'';
};
bandwidthRate = mkOption {
default = 0;
example = 100;
description = ''
Specify this to limit the bandwidth usage of relayed (server)
traffic. Your own traffic is still unthrottled. Units: bytes/second.
'';
};
bandwidthBurst = mkOption {
default = cfg.relay.bandwidthRate;
example = 200;
description = ''
Specify this to allow bursts of the bandwidth usage of relayed (server)
traffic. The average usage will still be as specified in relayBandwidthRate.
Your own traffic is still unthrottled. Units: bytes/second.
'';
};
port = mkOption {
default = 9001;
description = ''
What port to advertise for Tor connections.
'';
};
listenAddress = mkOption {
default = "";
example = "0.0.0.0:9090";
description = ''
Set this if you need to listen on a port other than the one advertised
in relayPort (e.g. to advertise 443 but bind to 9090). You'll need to do
ipchains or other port forwsarding yourself to make this work.
'';
};
exitPolicy = mkOption {
default = "";
example = "accept *:6660-6667,reject *:*";
description = ''
A comma-separated list of exit policies. They're considered first
to last, and the first match wins. If you want to _replace_
the default exit policy, end this with either a reject *:* or an
accept *:*. Otherwise, you're _augmenting_ (prepending to) the
default exit policy. Leave commented to just use the default, which is
available in the man page or at https://www.torproject.org/documentation.html
Look at https://www.torproject.org/faq-abuse.html#TypicalAbuses
for issues you might encounter if you use the default exit policy.
If certain IPs and ports are blocked externally, e.g. by your firewall,
you should update your exit policy to reflect this -- otherwise Tor
users will be told that those destinations are down.
'';
};
};
};
};
###### implementation
config = mkIf (cfg.client.enable || cfg.relay.enable) (
mkAssert (cfg.relay.enable -> !(cfg.relay.isBridge && cfg.relay.isExit)) "
Can't be both an exit and a bridge relay at the same time
" {
users.extraUsers = singleton
{ name = torUser;
uid = config.ids.uids.tor;
description = "Tor daemon user";
home = stateDir;
};
jobs = {
tor = { name = "tor";
startOn = "started network-interfaces";
stopOn = "stopping network-interfaces";
preStart = ''
mkdir -m 0755 -p ${stateDir}
chown ${torUser} ${stateDir}
'';
exec = "${tor}/bin/tor -f ${pkgs.writeText "torrc" cfg.config}";
}; }
// optionalAttrs (cfg.client.privoxy.enable && cfg.client.enable) {
torPrivoxy = { name = "tor-privoxy";
startOn = "started network-interfaces";
stopOn = "stopping network-interfaces";
preStart = ''
mkdir -m 0755 -p ${privoxyDir}
chown ${torUser} ${privoxyDir}
'';
exec = "${privoxy}/sbin/privoxy --no-daemon --user ${torUser} ${pkgs.writeText "torPrivoxy.conf" cfg.client.privoxy.config}";
}; };
services.tor.config = ''
DataDirectory ${stateDir}
User ${torUser}
''
+ optionalString cfg.client.enable ''
SOCKSPort ${cfg.client.socksListenAddress} IsolateDestAddr
SOCKSPort ${cfg.client.socksListenAddressFaster}
${opt "SocksPolicy" cfg.client.socksPolicy}
''
+ optionalString cfg.relay.enable ''
ORPort ${toString cfg.relay.port}
${opt "ORListenAddress" cfg.relay.listenAddress }
${opt "Nickname" cfg.relay.nickname}
${optint "RelayBandwidthRate" cfg.relay.bandwidthRate}
${optint "RelayBandwidthBurst" cfg.relay.bandwidthBurst}
${if cfg.relay.isExit then opt "ExitPolicy" cfg.relay.exitPolicy else "ExitPolicy reject *:*"}
${if cfg.relay.isBridge then "BridgeRelay 1" else ""}
'';
services.tor.client.privoxy.config = ''
# Generally, this file goes in /etc/privoxy/config
#
# Tor listens as a SOCKS4a proxy here:
forward-socks4a / ${cfg.client.socksListenAddressFaster} .
confdir ${privoxy}/etc
logdir ${privoxyDir}
# actionsfile standard # Internal purpose, recommended
actionsfile default.action # Main actions file
actionsfile user.action # User customizations
filterfile default.filter
# Don't log interesting things, only startup messages, warnings and errors
logfile logfile
#jarfile jarfile
#debug 0 # show each GET/POST/CONNECT request
debug 4096 # Startup banner and warnings
debug 8192 # Errors - *we highly recommended enabling this*
user-manual ${privoxy}/doc/privoxy/user-manual
listen-address ${cfg.client.privoxy.listenAddress}
toggle 1
enable-remote-toggle 0
enable-edit-actions 0
enable-remote-http-toggle 0
buffer-limit 4096
# Extra config goes here
'';
});
}