veilor-os

Hardened minimal Fedora KDE spin. Black-on-black. Locked down by default.

veilor-os is a Fedora 43 KDE Plasma remix for operators who want a clean, fast, opinionated desktop with serious hardening already wired in. Boot the ISO, set an admin password, work. No installer wizard. No initial-setup screen. No telemetry. No "would you like to enable X" prompts.

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Status

Pre-release v0.2.5 — first feature-complete ISO that actually applies the veilor-os overlay to the installed system. The build pipeline is green on CI; the live ISO boots to KDE on KVM and bare metal. See CHANGELOG.md for the full v0.2.0 → v0.2.5 story (it is worth reading — five real bugs caught and documented).

What is done: hardening (SELinux, sysctl, USBGuard, fail2ban, firewalld), KDE black theme, Fira Code system font, 3-mode power management, single-prompt LUKS install, first-boot admin password flow, reproducible CI build, EFI+BIOS bootable live ISO.

What is planned (see docs/ROADMAP.md): Plymouth black theme, SDDM theme, signed ISOs (own MOK + GPG), AppArmor + nftables, veilor-update / veilor-doctor helpers, public docs site.

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Quick install

# 1. Download the ISO (after public release; CI artifact for now)
sha256sum -c veilor-os-43-*.iso.sha256

# 2. Flash to USB. Replace /dev/sdX with your USB device — triple-check.
sudo dd if=veilor-os-43-*.iso of=/dev/sdX bs=4M status=progress conv=fsync
sync

# 3. Boot from USB, pick "Install veilor-os" from the menu.
# 4. Set a strong LUKS passphrase — the only prompt during install.
# 5. Reboot, remove USB.
# 6. On first boot: TTY prompts for an admin password (≥14 chars, mixed case,
#    digit, symbol). Once accepted, SDDM starts. Log in as `admin`.

Full install + first-boot walkthrough: docs/INSTALL.md.

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What veilor-os ships

Layer	Hardening
Boot	Secure Boot, lockdown=integrity, slab_nomerge, randomize_kstack_offset=on, vsyscall=none. LUKS2 (aes-xts-plain64, argon2id, mem=1GB). zram swap (no disk swap, no cold-boot leak).
Kernel	Locked sysctls: ptrace=2, kptr_restrict=2, dmesg_restrict=1, perf_event_paranoid=3, BPF JIT hardening, full ASLR, no SUID core dumps.
MAC	SELinux enforcing, targeted policy + custom veilor-systemd module.
Network	firewalld zone = drop, ssh only inbound. systemd-resolved with DNS-over-TLS (Cloudflare/Quad9 fallback), LLMNR off. NTS-authenticated chrony time.
SSH	password auth off, root login off, single admin user, X11 forwarding off, MaxAuthTries 3.
Auth	root locked, single admin user with sudo. pwquality minlen=14, 4 character classes. First-boot password forced via chage -d 0.
Audit	auditd rules covering passwd/shadow/sudoers/ssh/cron/sysctl/kernel modules and all privileged binaries.
IDS	fail2ban with sshd + pam-generic jails, journal backend, firewalld rich-rule action.
USB	USBGuard daemon, default-block, empty allowlist on first boot.
Services off	abrt*, cups, geoclue, avahi-daemon, bluetooth, ModemManager, gssproxy, atd, pcscd, kdeconnectd, PackageKit.
UX	KDE Plasma minimal, BreezeBlackPure colour scheme, Fira Code system font, veilor-power save | mid | perf with udev AC/battery auto-switch.

Full reference: docs/HARDENING.md.

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60-second tour — what's different from stock Fedora KDE

• No Anaconda Initial Setup wizard after first boot. Single LUKS passphrase prompt is the entire install interaction. Admin user is pre-created; password is set once on TTY1, then SDDM starts.
• Root is locked. passwd -S root reports L. There is no su - to root, ever. Use sudo.
• No PackageKit, no Flatpak by default. Updates happen with sudo dnf upgrade on your terms, not in the background.
• Default firewall zone is drop, not FedoraWorkstation. The only thing your machine answers is sshd on its assigned port.
• USBGuard blocks every USB device by default. First-boot procedure: plug in everything you trust, run usbguard generate-policy, done.
• Black-on-black KDE. Wallpaper, panel, Konsole all match. No "white flash" anywhere in the session.
• veilor-power save | mid | perf swaps the full tuned profile, CPU governor, EPP, battery threshold, and screen-dim policy in one command. Wired to AC/battery udev events too — laptop drops to save when unplugged automatically.

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How veilor-os compares

Feature	veilor-os	Stock Fedora KDE	Kicksecure
SELinux enforcing OOTB	yes	yes	yes
AppArmor	planned (v0.5)	no	yes
Secure Boot	yes (Fedora keys)	yes (Fedora keys)	configurable
LUKS2 with argon2id	default	optional	default
Single-prompt install (LUKS only)	yes	no	no
Root account locked by default	yes	no	yes
firewalld default zone = drop	yes	no	n/a (uses nftables)
USBGuard default-block	yes	no	yes
fail2ban + auditd OOTB	yes	no	partial
DNS-over-TLS by default	yes	no	yes
NTS-authenticated NTP	yes	no	yes
init_on_alloc/free (post-install)	yes (planned re-enable)	no	yes
Telemetry / phone-home	none	minimal	none
KDE Plasma branded theme	yes (black)	Breeze	n/a (XFCE)
Power-profile CLI	yes (3-mode)	partial	no
Reproducible kickstart-built ISO	yes	yes	yes (from Debian)
Base distro	Fedora 43	Fedora 43	Debian

veilor-os is not trying to compete with Whonix-style anonymity or Qubes-style isolation. It is a hardened daily-driver desktop — fast, clean, locked down, with no manual post-install hardening required.

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Repo layout

kickstart/   veilor-os.ks                 full kickstart definition
build/       Containerfile + build-iso.sh    reproducible ISO builder
overlay/     files dropped into installed root via %post
scripts/     hardening, SELinux policy, theme apply, firstboot
assets/      fonts, KDE colour scheme, branding, plymouth (planned)
docs/        BUILD / INSTALL / HARDENING / POWER / ROADMAP
test/        boot-checklist + KVM runner
.github/     CI workflows + PR template + CODEOWNERS

Build instructions: docs/BUILD.md. Roadmap: docs/ROADMAP.md. Contributing: CONTRIBUTING.md. Changelog: CHANGELOG.md.

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License

MIT — see LICENSE. Fira Code ships from Fedora's fira-code-fonts package under SIL OFL 1.1. Fedora packages remain under their respective licences. Kickstart, overlay, scripts, and docs in this repo are MIT.