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Initial Vexta Core v0.1.0 release

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# TOR SUPPORT IN DIGIBYTE
# TOR SUPPORT IN DIGIBYTE
It is possible to run DigiByte Core as a Tor hidden service, and connect to such services.
=======
It is possible to run DigiByte Core 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. See [Tor Project FAQ:TBBSocksPort](https://www.torproject.org/docs/faq.html.en#TBBSocksPort) for how to properly
configure Tor.
## Compatibility
- Starting with version 22.0, DigiByte Core only supports Tor version 3 hidden
services (Tor v3). Tor v2 addresses are ignored by DigiByte Core and neither
relayed nor stored.
- Tor removed v2 support beginning with version 0.4.6.
## How to see information about your Tor configuration via DigiByte Core
There are several ways to see your local onion address in DigiByte Core:
- in the debug log (grep for "tor:" or "AddLocal")
- in the output of RPC `getnetworkinfo` in the "localaddresses" section
- in the output of the CLI `-netinfo` peer connections dashboard
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
type, including Tor v2 and v3. This is useful to see how many onion addresses
are known to your node for `-onlynet=onion` and how many Tor v3 addresses it
knows when upgrading to DigiByte Core v22.0 and up that supports Tor v3 only.
## 1. Run DigiByte Core behind a Tor proxy
The first step is running DigiByte Core 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 outgoing connections only to .onion addresses. Incoming
connections are not affected by this option. This option can be
specified multiple times to allow multiple network types, e.g.
ipv4, ipv6 or onion. If you use this option with values other
than onion you *cannot* disable onion connections; outgoing onion
connections will be enabled when you use -proxy or -onion. Use
-noonion or -onion=0 if you want to be sure there are no outbound
onion connections over the default proxy or your defined -proxy.
In a typical situation, this suffices to run behind a Tor proxy:
./digibyted -proxy=127.0.0.1:9050
## 2. Automatically create a DigiByte Core onion service
DigiByte Core 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, DigiByte Core 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 DigiByte Core 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 digibyted debug log, pass `-debug=tor`.
### Control Port
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
```
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).
On some systems (such as Arch Linux), you may also need to add the following
line:
```
DataDirectoryGroupReadable 1
```
### Authentication
Connecting to Tor's control socket API requires one of two authentication
methods to be configured: cookie authentication or digibyted's `-torpassword`
configuration option.
#### Cookie authentication
For cookie authentication, the user running digibyted 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` digibyted 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
digibyted 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`:
```
stat -c '%G' /run/tor/control.authcookie
```
Once you have determined the `${TORGROUP}` and selected the `${USER}` that will
run digibyted, 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
digibyted.
#### `torpassword` authentication
For 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).
## 3. Manually create a DigiByte Core onion service
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/digibyte-service/
HiddenServicePort 8333 127.0.0.1:8334
The directory can be different of course, but virtual port numbers should be equal to
your digibyted'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 digibyte 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/digibyte-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:
./digibyted -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:
./digibyted ... -bind=127.0.0.1
If you don't care too much about hiding your node, and want to be reachable on IPv4
as well, use `discover` instead:
./digibyted ... -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:
./digibyted -onion=127.0.0.1:9050 -externalip=7zvj7a2imdgkdbg4f2dryd5rgtrn7upivr5eeij4cicjh65pooxeshid.onion -discover
## 4. Privacy recommendations
- Do not add anything but DigiByte Core ports to the onion service created in section 3.
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.