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NEX Viewer

Utility for parsing and (eventually) viewing NEX connections from PCAP(NG) network dumps

TODO:

This tool is still VERY early in development, so nearly nothing is finished

  • PRUDP v0 packet parsing
  • PRUDP v1 packet parsing
  • Fragmented payloads
  • SMM DataStore method 50 (0x32) (DataStoreSMM::GetCustomRankingByDataId) is completely busted
  • NEX Protocols (there is mixed support, some protocols are partially implemented)
  • CLI Display

Installation

npm i https://github.com/PretendoNetwork/nex-viewer

Example usage

const NEXParser = require('../..');
const parser = new NEXParser();

parser.on('packet', packet => {
	// DO SOMETHING
	console.log(packet);
});

parser.parse(__dirname + '/smm.pcapng');

NEX keys

PRUDP packet payloads get encrypted using a key which is encrypted using a key which is derived from your NEX account PID and password. In order to read packets, nex-viewer requires a nex-keys.txt file to be placed in any of these locations:

  • src folder of this repo
  • Root folder of this repo
  • %AppData%/Wireshark/nex-keys.txt (Windows)
  • ~/.config/wireshark/nex-keys.txt (Linux/MacOS)

nex-viewer will check the local repo first then look elsewhere for the file depending on your operating system. nex-keys.txt must be in the following format:

NEX_PID:NEX_PASSWORD
NEX_PID:NEX_PASSWORD
NEX_PID:NEX_PASSWORD
NEX_PID:NEX_PASSWORD

With each NEX account details on a new line. Each time nex-viewer runs it will derive the correct crypto key from each PID:PASSWORD and write it back to nex-keys.txt. This way your NEX password does not stay in plain-text on disk

WARNING!

DO NOT SHARE YOUR NEX PID AND PASSWORD WITH ANYBODY UNLESS YOU ABSOLUTELY KNOW WHAT YOU ARE DOING OR YOU DO NOT CARE ABOUT THE ACCOUNT. THIS PID/PASSWORD COMBINATION IS WHAT THE CONSOLE USES TO VERIFY YOU WHEN PLAYING ONLINE, NOT YOUR NNID USERNAME/PASSWORD. SHARING THESE DETAILS CAN ALLOW ANYONE TO LOGIN TO ANY GAME UNDER YOUR ACCOUNT

Obtaining NEX account details

NEX accounts are not the same thing as NNIDs. How you obtain your NEX account details depends on your system. See below for details

Obtaining NEX account details (Wii U)

There are 2 ways to obtain your NEX account details on a Wii U

  • Homebrew (can be unreliable)
  • Proxy server (can be difficult to setup)

To use homebrew to obtain your NEX account details on Wii U, all you need is an FTP server homebrew (such as FTPiiU_Everywhere). Connect to your Wii U via FTP and navigate to /storage_mlc/usr/save/system/act. Here you will find folders for every account on your Wii U. Open each folder and then open the account.dat file in any text editor. Verify the account is the one you want to use by looking for your NNID user name (it will be labeled as AccountId). Once you have found the account.dat file for the account you want to use, find the PrincipalId and NfsPassword fields. If you do not see one of these fields, or if the field has no value, you must use the proxy server method. The PrincipalId field is your NEX PID encoded as hexadecimal. Decode it back to decimal for use here (example: 68503904 decodes to 1750087940). The NfsPassword field is your NEX password

To use a proxy server to obtain your NEX account details on Wii U, you must first get a proxy server like Fiddler (Windows), Charles (all OSes) or mitmproxy (all OSes). Note: if using Fiddler, do not use Fiddler Everywhere, use the original Fiddler. Once installed you must either disable SSL verification on your console via homebrew or replace your systems SSL certificates with the proxy server certificates. Be warned that messing up replacing the SSL certficiates will brick your console (can be recovered). Here are guides for Fiddler and Charles. Once connected to the proxy server on your Wii U look for the request to https://account.nintendo.net/v1/api/provider/nex_token/@me. Open the response to this request and locate the pid and nex_password fields. These are your NEX account details

Obtaining NEX account details (3DS)

Unlike the Wii U the 3DS does not request your NEX account details from any server. Instead it is stored on your console after the first time you connect to the friends server. The only wait to obtain your 3DS NEX account details is to dump them with homebrew. Downloads this homebrew application and run it on your 3DS. It will create a nex-keys.txt file on the root of the SD card in the correct format already. The source code for the homebrew is available here