VIAaaS/README.md
2021-06-17 11:29:23 -03:00

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VIAaaS
---
VIAaaS - ViaVersion as a Service - Standalone ViaVersion proxy
<img alt="VIAaaS Logo" height="200" src="https://cdn.discordapp.com/attachments/316218802155028482/850014925622476820/unknown.png">
Public instances: https://github.com/ViaVersion/VIAaaS/wiki/List-of-Public-Instances
Discord: https://viaversion.com/discord
Supported versions: https://viaversion.com/
## How does it work?
- [ViaVersion](https://viaversion.com), [ViaBackwards](https://viaversion.com/backwards)
and [ViaRewind](https://viaversion.com/rewind) translates the connections to backend server.
- VIAaaS auth page stores account credentials in the player's browser local storage. Check for XSS vulnerabilities on
your domain.
- Due to technical/security reasons, it requires a CORS Proxy for calling Mojang APIs, which may make Mojang see that as
suspicious and reset/block your account password if the IP address seems suspect.
- Account credentials aren't sent to VIAaaS instance, though it's intermediated by CORS Proxy.
- VIAaaS receives a the session hash from instance and then the browser validates it to Mojang.
## Setting up server instance
Download: [GitHub Actions](https://github.com/ViaVersion/VIAaaS/actions) (needs to be logged into GitHub)
or [JitPack](https://jitpack.io/com/github/ViaVersion/VIAaaS/master-SNAPSHOT/VIAaaS-master-SNAPSHOT-all.jar)
### How to download and start VIAaaS server:
```sh
curl -Lf --output VIAaaS-all.jar "https://jitpack.io/com/github/ViaVersion/VIAaaS/master-SNAPSHOT/VIAaaS-master-SNAPSHOT-all.jar"
java -jar VIAaaS-all.jar
```
- Requires Java 11
- Default Minecraft: ```via.localhost``` with port 25565
- Default HTTPS: ```https://localhost:25543/```
- Default WS URL: ```wss://localhost:25543/ws```
### How to create a public server
- You need a domain wildcarding to VIAaaS instance, like ``*.example.com -> 192.168.123.123``. You can
use [DuckDNS](https://duckdns.org/) DDNS service.
- Configure the hostname in the config
- Open the Minecraft port (25565)
- The HTTPS page needs a certificate, you can use [Apache](https://httpd.apache.org/) (with
a [Let's Encrypt](https://letsencrypt.org/) certificate) as a proxy. See apache_copypasta.txt file.
## CORS Proxy
- For less chance of Mojang seeing the login as suspect, you (the player) should set up a CORS proxy on your machine.
- Note the ending slash in cors-anywhere address
- You can use my public instance
at https://crp123-cors.herokuapp.com/ ([source](https://github.com/creeper123123321/cors-anywhere/)) too, but proxies
have a bit more chance of being seen as suspect.
### Setting up [cors-anywhere](https://www.npmjs.com/package/cors-anywhere) on local machine:
```sh
git clone https://github.com/Rob--W/cors-anywhere
cd cors-anywhere
npm install
node server.js
```
- It will be available at ```http://localhost:8080/```
## Usage for players
#### Offline mode:
- Connect to ```mc.example.net.via.localhost```
#### Online mode:
- You can use two accounts (avoids Bad Login error), the same account for front-end and back-end connections, or
use ```_of```
(offline mode in frontend. May be useful if you have a client which is incompatible with online mode).
- Go to VIAaaS auth webpage (default is https://localhost:25543/)
- Configure CORS proxy, see above in "CORS Proxy" section
- Listen to the username A you'll use to connect to the proxy.
- Add the account B to VIAaaS page which you'll use in ```_u``` parameter below.
- Keep the page open
- Connect to ```mc.example.com._u(B).via.localhost``` (```_u``` can be removed if you are using the same username)
- Approve the login in the webpage
- If you use the same online mode account, your client may show Bad Login. You can use a mod like
[Auth Me](https://www.curseforge.com/minecraft/mc-mods/auth-me)
or [ReAuth](https://www.curseforge.com/minecraft/mc-mods/reauth).
### Address options
#### Example address:
- ```server.example.net._p25565._v1_12_2._of._uBACKUSERNAME.via.example.com```
- ```server.example.net.v_1_8.via.example.com```
- It's inspired by [Tor2web](https://www.tor2web.org/) proxies.
#### Address parts:
- You can use ``(option)_(value)`` too, like ``p_25565``.
- ```server.example.net```: backend server address
- ```_p```: backend port
- ```_v```: backend version ([protocol id](https://wiki.vg/Protocol_version_numbers) or name with underline instead of
dots). ```AUTO``` is default and ``-1`` is fallback if it fails.
- ```_o```: ```t``` to force online mode in frontend, ```f``` to disable online mode in frontend. If not set, it will be
based on backend online mode.
- ```_u```: username to use in backend connection
- ```via.example.com```: instance address (defined in config)
## WARNING
- VIAaaS may trigger anti-cheats, due to block, item, movement and other differences between versions. USE AT OWN RISK
- Take care of browser local storage. Check for XSS vulnerabilities on your domain.
- Check the security of CORS proxy, it will intermediate Mojang API calls.
- Mojang may lock your account when API is called from a suspect IP address
## FAQ
### Accounts
#### My Microsoft account <18 years old is not able to log in, it's giving XSTS error:
- Add your account to a family (see https://wiki.vg/Microsoft_Authentication_Scheme#Authenticate_with_XSTS)
#### Why a online webpage for online mode?:
- It's easier to maintain in that way, because providing login via chat requires encoding and decoding more packets
which change through versions.
- It allows your account password and token to be kept with you.
#### How to use Microsoft Account?:
- If you are using a public VIAaaS instance, use this page https://viaversion.github.io/VIAaaS/ and configure the
WebSocket address.
### Connection
#### How to use IPv6?:
- When listening to 0.0.0.0, it should listen on IPv6 too.
- To use IPv6 in backend address, you need to use a instance with IPv6 connectivity. The hostname parser currently
doesn't support direct IPv6, but you can use a DNS name with https://sslip.io/
#### I'm getting a DNS error/"Unknown host" while connecting to (...).localhost
- Try configuring via.localho.st as hostname suffix
#### How to use with Geyser?
- Currently you need to set the parameters (at least the hostname) in Geyser's `address` field:
```yml
remote:
# The IP address of the remote (Java Edition) server
address: 2b2t.org._v1_12_2.via.localhost
```
- If you are using a public GeyserConnect instance: connect to a publicly available VIAaaS instance,
like ```mc.example.com.via.example.net``` as a Java Edition server.
#### Can I use it to connect to .onion Minecraft hidden servers?
- You can use .onion addresses if the instance is proxying the backend connections to TOR. Note that VIAaaS may log your
requests.
#### Can you support more versions / Is there some alternative?
- See [DirtMultiVersion](https://github.com/DirtPowered/DirtMultiversion) and RK_01's ViaProxy server (lenni0451.net:25563)