Tor-Enabled data exchange with Client oc_client.go and Server oc_server.go

Client oc_client.go

This client allows you to securely send files to a server using either the Tor network (for enhanced privacy) or clearnet.
It supports various options for flexibility and ease of use.

Features

• Send data through Tor network (default) or clearnet
• Optional username support
• Use of a data file for server address:port and password

Requirements

• Go programming language
• golang.org/x/net/proxy package (for Tor support)

To install the required package, run:

go get golang.org/x/net/proxy

To compile oc_client.go and oc_server.go use:

$ go build -ldflags "-s -w" oc_client.go
$ go build -ldflags "-s -w" oc_client.go

• Tor Expert Bundle
• https://www.torproject.org/download/tor/

Usage

Basic Usage

Start tor.exe from the Tor Expert Bundle, then run the compiled oc_client.go program.

$ oc_client [-u username] [-d datafile] [-clearnet] -f filename <server_address:port password>

Using a Data File

$ oc_client [-u username] -d <data_file> [-clearnet] -f filename

The data file should contain the server address:port and password, separated by a space, on a single line, ending with LF or CRLF.
Multiple entries are supported.
You can put comment lines, starting with #, in your data_file too.
Please note: The last entry in your data_file must be a single LF or CRLF and not more.

Options

• -u [username]: Specify an optional username
• [-clearnet]: Use clearnet instead of Tor network
• -f <filename>: Specify the filename to be send, which is used on the server
• -d <data_file>: Use a data file containing server address:port and password

Examples

1. Send data through Tor:

$ oc_client -f myfile.txt URL.onion:8080 mypassword

2. Send data using clearnet with a username:

$ oc_client -u myusername -clearnet example.com:8080 mypassword -f myfile.txt

3. Send data using a data file:

$ oc_client -d server_data.txt -f myfile.txt

Notes

• By default, the client uses the Tor network. Make sure you have Tor running on your system (usually on port 9050).
• When using the -clearnet option, your IP address will be visible to the server.

Security Considerations

• Be cautious when sending sensitive files and consider using encryption before sending.
• The Tor network provides anonymity but may be slower than data send through clearnet.

Server oc_server.go

Requirements

• Tor Browser Bundle
• https://www.torproject.org/

Usage

On Windows open the torrc file located, for example, at:

C:\Tor Browser\Browser\TorBrowser\Data\Tor\

and add the following two lines:

HiddenServiceDir C:\Tor Browser\Browser\TorBrowser\Data\Tor\hidden_service
HiddenServicePort 8080 127.0.0.1:8080

Restart Tor Browser and your Tor Hidden Service folder will be created at the same location your torrc file resides. Look at the file 'hostname' which contains the .onion URL for your Tor Hidden Service and give the address to your friends.

Edit the password in line 13 in the source code and compile.

Now run the compiled oc_server.go with the -p parameter, for the file path files should be stored.

Thats all.

You now have Tor and Tor Browser running to exchange files with your friends, as long as Tor Browser with oc_server.go is running.

Notes

You can omit the usage of Tor Browser and instead use only Tor-Expert-Bundle and put the torrc file in the tor folder and start tor.exe with the -f parameter, to use the torrc file.

If you put the torrc file into the tor folder, of Tor-Expert-Bundle, the torrc file may look like this:

HiddenServiceDir hidden_service
HiddenServicePort 8080 127.0.0.1:8080
HiddenServicePort 8081 127.0.0.1:8081
HiddenServicePort 8082 127.0.0.1:8082
HiddenServicePort 8083 127.0.0.1:8083
HiddenServicePort 8084 127.0.0.1:8084

minitalk

The minitalk folder contains a small talk client and server, so that Alice and Bob can talk to each other.

oc_paganini_server.go

oc_paganini_server.go allows you to post to Usenet anonymously, with oc_client.go, via the Paganini Newsserver's .onion URL.
This results in 6 hops, instead of 3.

oc_m2n_server.go

oc_m2n_server.go allows you to send messages anonymously to Usenet via Dizum's mail2news Gateway.
This results in 6 hops, instead of 3.

oc_middleman_server.go

oc_middleman_server.go is a middleman server which can be optionally used to send files through nine hops.
It needs a special file format, containing an X-OC-To: header. Multiple middleman hops are supported by
adding additional X-OC-To headers.

Example Usenet message:

X-OC-To: utxloshiyxfxl7qxvcfglu4lscetfrxvagqqsaarl6kz2oxkoyp3tbid.onion:8081 secretPassword
From: Bob bob@example.org
Subject: Onion Courier Middleman Test
Newsgroups: alt.test

Hello World! :-)

--
Regards
Bob

oc_guard_server.go

oc_guard_server.go uses minicrypt to decrypt incoming data, prior it sends it to middlemen. The accepted message size for a Guard is limited to 28 KB.
A new -h (hide server response) parameter was added to oc_client.go, so that
users with a live system like Tails can hide the data travelling paths.

oc_email_server.go

oc_email_server.go uses your VPS MTA, which should have a whitelist defined, for reachable email domains.

Closing words

If you like the idea of point to point communication, without third-party servers involved, consider a donation to the following Bitcoin address:

bc1qhgek8p5qcwz7r6502y8tvenkpsw9w5yafhatxk

or Monero address:

45TJx8ZHngM4GuNfYxRw7R7vRyFgfMVp862JqycMrPmyfTfJAYcQGEzT27wL1z5RG1b5XfRPJk97KeZr1svK8qES2z1uZrS

This project is dedicated to Alice and Bob.