Password confirmation, Mojang-authenticated Java accounts, Floodgate-authenticated Bedrock accounts, TOTP, recovery, active sessions, legacy imports, and proxy routing are included without requiring an external database. Discord, Telegram, and Velocity are separate addons.

mAuth only supports authenticated Minecraft clients. A standalone server must use online-mode=true. A Velocity network must use online-mode=true on the proxy and secure player information forwarding to its backend servers. The Velocity addon refuses to start unless the proxy authenticates Java accounts with Mojang.

What it does

• Argon2id passwords with migration from bcrypt and common AuthMe-style hashes
• H2, SQLite, MySQL, MariaDB, and PostgreSQL storage with schema upgrades
• Mojang-authenticated Java accounts and Bedrock autologin through Floodgate
• TOTP, recovery codes, verified email recovery, sessions, and account locks
• login captcha, connection flood handling, IP limits, shared-IP session protection, nickname filters, and VPN providers
• separate login/registration deadlines with a localized countdown boss bar
• duplicate-session protection and reliable save/restore around the built-in limbo world
• account imports from AuthMe, nLogin, LibreLogin, and OpeNLogin
• a protected local web panel, PlaceholderAPI values, audit history, and bStats

Requirements

• Java 25
• Paper-compatible server 26.2
• Velocity only when using the proxy addon
• Mojang authentication enabled on the standalone server or Velocity proxy

Install

1. Put mAuth-1.0.2.jar in the backend server plugins directory.
2. Keep online-mode=true on a standalone server. For a Velocity network, keep online-mode=true on the proxy and configure secure player information forwarding.
3. Start the server once and edit plugins/mAuth/config.yml.
4. Add optional addon jars beside the core jar.
5. For proxy mode, set the same shared-secret on the proxy and backend.

H2 is the default storage. Discord, Telegram, email, VPN lookup, and the web panel stay disabled until configured. bStats and update checks can be disabled separately.

Configuration

• security: password hashing, separate login/registration timeouts, bossbar, login limits, TOTP encryption, sessions, duplicate-session protection, and new IP or device handling
• storage: database type, local file, pool settings, or a complete JDBC URL override
• discord, telegram, and email: account linking, verification, notifications, and recovery
• proxy.shared-secret: signed synchronization with the Velocity addon
• vpn and geoip: risk provider, location database, caching, and fail-open or fail-closed behavior
• web: bind address, port, and generated Basic authentication token
• metrics.bstats-id and updates.modrinth-project-id: optional metrics and update discovery

Config files carry a version number. Missing settings are added when mAuth upgrades an older config. Player messages live in lang/en_US.yml and lang/ru_RU.yml; another locale file can be selected with language.default.

Do not expose the web panel to the public Internet without a trusted reverse proxy and TLS. Keep bot tokens, SMTP credentials, the proxy secret, and security.data-encryption-key private.

Web panel

The protected panel lists accounts and active sessions and lets an administrator terminate every session for an account.

!mAuth web panel

Artifacts

• mAuth-1.0.2.jar: Paper, Purpur, and Folia core
• mAuth-API-1.0.2.jar: public interfaces and authentication event
• mAuth-Velocity-1.0.2.jar: authenticated Velocity login routing
• mAuth-Discord-1.0.2.jar: Discord linking and recovery
• mAuth-Telegram-1.0.2.jar: Telegram linking and recovery

Player commands

/register, /login, /logout, /changepassword, /premium, /passwordlogin, /2fa, /sessions, /email, /recover, and /telegram are registered through the Paper Commands API. Incomplete commands are handled by mAuth and show localized usage instead of the server's generic syntax error.

Administration

/mauth provides reload, import, force-login, account lock, and Discord history operations. /mauthreset, /mauthunlink, /mauthlog, and /mauthip are owner-facing account tools. Full IP addresses are only exposed through the protected IP-history permission.

PlaceholderAPI

When PlaceholderAPI is installed, mAuth registers %mauth_authenticated%, %mauth_status%, and %mauth_version%.

Telemetry and updates

mAuth uses bStats plugin ID 33343 for anonymous usage statistics. Disable collection with metrics.enabled: false. The update checker reads the public Modrinth project and can be disabled independently with updates.enabled: false.

Build

./gradlew clean build :api:build :discord:build :velocity:build :telegram:build

The project is licensed under the MIT License.