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- init_fingerprint_async: hoist username before the await so a concurrent connect_monitor signal (hotplug / suspend-resume) cannot cause a RefCell panic. Re-borrow after the await for signal wiring. - set_avatar_from_file: decode via gio::File::read_future + Pixbuf::from_stream_at_scale_future so the GTK main thread stays responsive during monitor hotplug. Default icon shown while loading.
Moonlock
A secure Wayland lockscreen with GTK4, PAM authentication and fingerprint support. Part of the Moonarch ecosystem.
Features
- ext-session-lock-v1 — Protocol-guaranteed screen locking (compositor keeps screen locked on crash,
exit(1)in release if unsupported) - PAM authentication — Uses system PAM stack (
/etc/pam.d/moonlock) with 30s timeout and generation counter - Fingerprint unlock — fprintd D-Bus integration with sender validation, async init (window appears instantly),
pam_acct_mgmtcheck after verify, auto-resume on transient errors - Multi-monitor + hotplug — Lockscreen on every monitor with shared blur and avatar caches; monitors added after suspend/resume get windows automatically via
connect_monitorsignal - GPU blur — Background blur via GskBlurNode (downscale to max 1920px, configurable 0–100)
- i18n — German and English (auto-detected)
- Faillock warning — Progressive UI warning after failed attempts, PAM decides lockout
- Panic safety — Panic hook logs but never unlocks (installed before logging)
- Password wiping —
Zeroizeon drop from GTK entry through PAM FFI layer - Journal logging —
journalctl -t moonlock, debug level viaMOONLOCK_DEBUGenv var
Requirements
- GTK 4
- gtk4-session-lock (ext-session-lock-v1 support)
- PAM (
/etc/pam.d/moonlock) - Optional: fprintd for fingerprint support
Building
cargo build --release
Installation
# Install binary
sudo install -Dm755 target/release/moonlock /usr/bin/moonlock
# Install PAM config
sudo install -Dm644 config/moonlock-pam /etc/pam.d/moonlock
# Optional: Install example config
sudo install -Dm644 config/moonlock.toml.example /etc/moonlock/moonlock.toml.example
Configuration
Create /etc/moonlock/moonlock.toml or ~/.config/moonlock/moonlock.toml:
background_path = "/usr/share/wallpapers/moon.jpg"
background_blur = 40.0 # 0.0–100.0, optional
fingerprint_enabled = true
Usage
Typically launched via keybind in your Wayland compositor:
# Niri keybind example
binds {
Mod+L { spawn "moonlock"; }
}
Development
cargo test
cargo build --release
LD_PRELOAD=/usr/lib/libgtk4-layer-shell.so ./target/release/moonlock
License
MIT