It is possible to run Limenka as a Tor onion service, and connect to such services.
The following directions assume you have a Tor proxy running on port 9050. Many distributions default to having a SOCKS proxy listening on port 9050, but others may not. In particular, the Tor Browser Bundle defaults to listening on port 9150.
services (Tor v3). Tor v2 addresses are ignored by Limenka and neither relayed nor stored.
There are several ways to see your local onion address in Limenka:
-netinfogetnetworkinfo.onion)You may set the -debug=tor config logging option to have additional
information in the debug log about your Tor configuration.
CLI -addrinfo returns the number of addresses known to your node per
network. This can be useful to see how many onion peers your node knows,
e.g. for -onlynet=onion.
You can use the getnodeaddresses RPC to fetch a number of onion peers known to your node; run limenka-cli help getnodeaddresses for details.
The first step is running Limenka behind a Tor proxy. This will already anonymize all outgoing connections, but more is possible.
-proxy=ip:port Set the proxy server. If SOCKS5 is selected (default), this proxy server will be used to try to reach .onion addresses as well. You need to use -noonion or -onion=0 to explicitly disable outbound access to onion services.
-onion=ip:port Set the proxy server to use for Tor onion services. You do not need to set this if it's the same as -proxy. You can use -onion=0 to explicitly disable access to onion services.
Note: Only the -proxy option sets the proxy for DNS requests; with -onion they will not route over Tor, so use -proxy if you have privacy concerns.
-listen When using -proxy, listening is disabled by default. If you want to manually configure an onion service (see section 3), you'll need to enable it explicitly.
-connect=X When behind a Tor proxy, you can specify .onion addresses instead -addnode=X of IP addresses or hostnames in these parameters. It requires -seednode=X SOCKS5. In Tor mode, such addresses can also be exchanged with other P2P nodes.
-onlynet=onion Make automatic outbound connections only to .onion addresses. Inbound and manual connections are not affected by this option. It can be specified multiple times to allow multiple networks, e.g. onlynet=onion, onlynet=i2p, onlynet=cjdns.
In a typical situation, this suffices to run behind a Tor proxy:
limenkad -proxy=127.0.0.1:9050
Limenka makes use of Tor's control socket API to create and destroy ephemeral onion services programmatically. This means that if Tor is running and proper authentication has been configured, Limenka automatically creates an onion service to listen on. The goal is to increase the number of available onion nodes.
This feature is enabled by default if Limenka is listening (-listen) and
it requires a Tor connection to work. It can be explicitly disabled with
-listenonion=0. If it is not disabled, it can be configured using the
-torcontrol and -torpassword settings.
To see verbose Tor information in the limenkad debug log, pass -debug=tor.
You may need to set up the Tor Control Port. On Linux distributions there may be
some or all of the following settings in /etc/tor/torrc, generally commented
out by default (if not, add them):
ControlPort 9051
CookieAuthentication 1
CookieAuthFileGroupReadable 1
DataDirectoryGroupReadable 1
Add or uncomment those, save, and restart Tor (usually systemctl restart tor
or sudo systemctl restart tor on most systemd-based systems, including recent
Debian and Ubuntu, or just restart the computer).
Connecting to Tor's control socket API requires one of two authentication
methods to be configured: cookie authentication or limenkad's -torpassword
configuration option.
For cookie authentication, the user running limenkad must have read access to
the CookieAuthFile specified in the Tor configuration. In some cases this is
preconfigured and the creation of an onion service is automatic. Don't forget to
use the -debug=tor limenkad configuration option to enable Tor debug logging.
If a permissions problem is seen in the debug log, e.g. `tor: Authentication cookie /run/tor/control.authcookie could not be opened (check permissions)`, it can be resolved by adding both the user running Tor and the user running limenkad to the same Tor group and setting permissions appropriately.
On Debian-derived systems, the Tor group will likely be debian-tor and one way
to verify could be to list the groups and grep for a "tor" group name:
getent group | cut -d: -f1 | grep -i tor
You can also check the group of the cookie file. On most Linux systems, the Tor
auth cookie will usually be /run/tor/control.authcookie:
TORGROUP=$(stat -c '%G' /run/tor/control.authcookie)
Once you have determined the ${TORGROUP} and selected the ${USER} that will
run limenkad, run this as root:
usermod -a -G ${TORGROUP} ${USER}
Then restart the computer (or log out) and log in as the ${USER} that will run
limenkad.
torpassword authenticationFor the -torpassword=password option, the password is the clear text form that
was used when generating the hashed password for the HashedControlPassword
option in the Tor configuration file.
The hashed password can be obtained with the command `tor --hash-password password` (refer to the [Tor Dev Manual](https://2019.www.torproject.org/docs/tor-manual.html.en) for more details).
You can also manually configure your node to be reachable from the Tor network.
Add these lines to your /etc/tor/torrc (or equivalent config file):
HiddenServiceDir /var/lib/tor/limenka-service/ HiddenServicePort 8333 127.0.0.1:8334
The directory can be different of course, but virtual port numbers should be equal to your limenkad's P2P listen port (8333 by default), and target addresses and ports should be equal to binding address and port for inbound Tor connections (127.0.0.1:8334 by default).
-externalip=X You can tell limenka about its publicly reachable addresses using this option, and this can be an onion address. Given the above configuration, you can find your onion address in /var/lib/tor/limenka-service/hostname. For connections coming from unroutable addresses (such as 127.0.0.1, where the Tor proxy typically runs), onion addresses are given preference for your node to advertise itself with.
You can set multiple local addresses with -externalip. The one that will be rumoured to a particular peer is the most compatible one and also using heuristics, e.g. the address with the most incoming connections, etc.
-listen You'll need to enable listening for incoming connections, as this is off by default behind a proxy.
-discover When -externalip is specified, no attempt is made to discover local IPv4 or IPv6 addresses. If you want to run a dual stack, reachable from both Tor and IPv4 (or IPv6), you'll need to either pass your other addresses using -externalip, or explicitly enable -discover. Note that both addresses of a dual-stack system may be easily linkable using traffic analysis.
In a typical situation, where you're only reachable via Tor, this should suffice:
limenkad -proxy=127.0.0.1:9050 -externalip=7zvj7a2imdgkdbg4f2dryd5rgtrn7upivr5eeij4cicjh65pooxeshid.onion -listen
(obviously, replace the .onion address with your own). It should be noted that you still listen on all devices and another node could establish a clearnet connection, when knowing your address. To mitigate this, additionally bind the address of your Tor proxy:
limenkad ... -bind=127.0.0.1:8334=onion
If you don't care too much about hiding your node, and want to be reachable on IPv4
as well, use discover instead:
limenkad ... -discover
and open port 8333 on your firewall (or use port mapping, i.e., -upnp or -natpmp).
If you only want to use Tor to reach .onion addresses, but not use it as a proxy for normal IPv4/IPv6 communication, use:
limenkad -onion=127.0.0.1:9050 -externalip=7zvj7a2imdgkdbg4f2dryd5rgtrn7upivr5eeij4cicjh65pooxeshid.onion -discover
If you run a web service too, create a new onion service for that. Otherwise it is trivial to link them, which may reduce privacy. Onion services created automatically (as in section 2) always have only one port open.