28allday
3b2707a8bd
Single SSH session takes a fresh Arch box to a locked-down server running native OMATERM (28allday/omaterm@native-frozen, fetched read-only at runtime). - Phase A: hardening (deploy user, key-only SSH, ufw 22+tailscale0, fail2ban, weekly updates, swap, journal cap) — proven on tyler + durden 2026-06-06 - Phase B: hands off to install-native.sh as the deploy user with a real TTY; recovery net resumes first-run setup and lands in a shell if the chain exits early instead of dropping the SSH session - Every answer asked once: machine name = hostname + tailnet name + ssh alias; git identity pre-seeds ~/.gitconfig so omaterm setup skips it; answers survive the kernel-upgrade reboot - Kernel-upgrade guard offers the reboot in-script with exact resume command Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
590 lines
21 KiB
Bash
Executable file
590 lines
21 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -euo pipefail
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# ─────────────────────────────────────────────────────────────────────────────
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# One-shot server bootstrap: fresh Arch VPS → hardened box → native OMATERM.
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#
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# Run as root over SSH **with a TTY** (the install ends in an interactive
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# omaterm session, so a plain `ssh host cmd` won't do):
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#
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# ssh -t root@YOUR_SERVER 'bash <(curl -fsSL https://raw.githubusercontent.com/28allday/omaserver/main/install-server.sh)'
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#
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# Phase A (as root): hardening — deploy user, key-only SSH, ufw, fail2ban,
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# weekly updates, swap, journald cap, cache hygiene
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# Phase B (as user): hands off to install-native.sh from the frozen fork
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# (28allday/omaterm @ native-frozen — the branch omalocal
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# also pins; fetched at runtime, never modified) which
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# installs packages, omadots, AI agents, and runs the
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# interactive first-time setup
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#
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# Safe to re-run — completed steps skip themselves. After the first run root
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# SSH login is disabled, so re-run as the deploy user with sudo.
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# ─────────────────────────────────────────────────────────────────────────────
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# =============================================================================
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# DEFAULTS
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# =============================================================================
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TIMEZONE="${TIMEZONE:-Europe/London}"
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LOCALE="${LOCALE:-en_GB.UTF-8}"
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# Where install-native.sh is fetched from at runtime — the frozen branch that
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# omalocal also pins. Read-only consumer: nothing is ever pushed there.
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OMATERM_REPO_RAW="https://raw.githubusercontent.com/28allday/omaterm/native-frozen"
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# This script's own home, for re-run instructions
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SELF_URL="https://raw.githubusercontent.com/28allday/omaserver/main/install-server.sh"
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# =============================================================================
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# COLOURS
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# =============================================================================
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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CYAN='\033[0;36m'
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NC='\033[0m'
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log() { echo -e "${GREEN}[✓]${NC} $1"; }
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warn() { echo -e "${YELLOW}[!]${NC} $1"; }
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err() { echo -e "${RED}[✗]${NC} $1"; }
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step() { echo -e "\n${CYAN}━━━ $1 ━━━${NC}\n"; }
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# =============================================================================
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# PRE-FLIGHT CHECKS
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# =============================================================================
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if [ "$EUID" -ne 0 ]; then
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err "This script must be run as root."
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err "Usage: ssh -t root@YOUR_SERVER 'bash <(curl -fsSL $SELF_URL)'"
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exit 1
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fi
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if [ ! -f /etc/arch-release ]; then
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err "This script requires Arch Linux."
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exit 1
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fi
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if [ ! -t 0 ]; then
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err "No TTY on stdin — the omaterm installer needs an interactive terminal."
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err "Connect with: ssh -t root@YOUR_SERVER"
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err "Then run: bash <(curl -fsSL $SELF_URL)"
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exit 1
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fi
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# =============================================================================
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# INTERACTIVE SETUP
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# =============================================================================
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echo -e "${CYAN}"
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echo "╔══════════════════════════════════════════════════════════════╗"
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echo "║ OMATERM Server Bootstrap ║"
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echo "║ Arch Linux · Hardening · Native OMATERM ║"
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echo "╚══════════════════════════════════════════════════════════════╝"
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echo -e "${NC}"
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# Public IP — used in re-run instructions and the SSH config snippet
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SERVER_IP=$(curl -4 -s --max-time 5 ifconfig.me 2>/dev/null || \
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curl -4 -s --max-time 5 icanhazip.com 2>/dev/null || \
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echo "YOUR_SERVER_IP")
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# Answers survive the kernel-upgrade reboot — a re-run finds them here and
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# doesn't ask again
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STATE_FILE="/root/.install-server.conf"
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SSH_ALIAS=""
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DEPLOY_USER=""
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GIT_NAME=""
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GIT_EMAIL=""
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if [ -f "$STATE_FILE" ]; then
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# shellcheck source=/dev/null
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. "$STATE_FILE"
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fi
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if [ -n "$SSH_ALIAS" ] && [ -n "$DEPLOY_USER" ]; then
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log "Using saved settings from the previous run"
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else
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# Machine name — used as the hostname, the tailnet name, AND the alias in
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# your local SSH config (ssh <name>). Asked ONCE, used everywhere.
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echo ""
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echo " This name becomes the hostname, the Tailscale machine name,"
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echo " and your local SSH alias (ssh <name>)."
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read -rp "Machine name for this server [vps]: " input_alias
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SSH_ALIAS="${input_alias:-vps}"
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# Username
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echo ""
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read -rp "Choose a username for the deploy user [deploy]: " input_user
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DEPLOY_USER="${input_user:-deploy}"
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# Git identity — pre-seeds the deploy user's ~/.gitconfig so omaterm's
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# first-run setup skips its git prompts. Leave blank to be asked there
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# instead.
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echo ""
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read -rp "Git name (blank to skip): " GIT_NAME
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if [ -n "$GIT_NAME" ]; then
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read -rp "Git email: " GIT_EMAIL
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fi
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fi
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# Validate username
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if ! [[ "$DEPLOY_USER" =~ ^[a-z_][a-z0-9_-]*$ ]]; then
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err "Invalid username. Use lowercase letters, numbers, hyphens, underscores."
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rm -f "$STATE_FILE"
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exit 1
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fi
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# Confirm
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echo ""
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echo -e "${CYAN}━━━ Confirm settings ━━━${NC}"
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echo ""
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echo " Machine name: $SSH_ALIAS (hostname + tailnet + ssh alias)"
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echo " Deploy user: $DEPLOY_USER"
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echo " Git identity: ${GIT_NAME:-—} ${GIT_EMAIL:+<$GIT_EMAIL>}"
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echo " Timezone: $TIMEZONE"
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echo " Omaterm: native (28allday/omaterm @ native-frozen)"
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echo ""
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read -p "Continue? (Y/n) " -n 1 -r
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echo ""
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if [[ $REPLY =~ ^[Nn]$ ]]; then
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rm -f "$STATE_FILE"
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echo "Aborted — saved settings cleared. Re-run to start over."
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exit 0
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fi
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# Persist for re-runs (cleared on abort above)
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printf 'SSH_ALIAS=%q\nDEPLOY_USER=%q\nGIT_NAME=%q\nGIT_EMAIL=%q\n' \
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"$SSH_ALIAS" "$DEPLOY_USER" "$GIT_NAME" "$GIT_EMAIL" > "$STATE_FILE"
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chmod 600 "$STATE_FILE"
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# =============================================================================
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# 1. SYSTEM UPDATES & ESSENTIALS
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# =============================================================================
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step "1/9 · System updates & essential packages"
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pacman -Syu --noconfirm
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# If -Syu upgraded the kernel, the running kernel's modules are gone and
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# things like tun (tailscale) and netfilter (docker/ufw) can't load —
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# reboot and re-run (script is safe to re-run; completed steps skip
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# themselves). This runs BEFORE SSH hardening, so root login still works
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# for the re-run.
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if [ ! -d "/usr/lib/modules/$(uname -r)" ]; then
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warn "Kernel was upgraded — running kernel $(uname -r) has no modules on disk."
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warn "The box must reboot before setup can continue."
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echo ""
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echo " After the reboot, reconnect and re-run — it picks up where it left off:"
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echo ""
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if [ -f "$0" ] && [[ "$0" != /dev/fd/* ]]; then
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echo -e " ${CYAN}ssh -t root@$SERVER_IP bash $(basename "$0")${NC}"
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else
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echo -e " ${CYAN}ssh -t root@$SERVER_IP 'bash <(curl -fsSL $SELF_URL)'${NC}"
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fi
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echo ""
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read -p "Reboot now? (Y/n) " -n 1 -r
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echo ""
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if [[ ! $REPLY =~ ^[Nn]$ ]]; then
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systemctl reboot
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fi
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exit 1
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fi
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# Hardening-phase packages only — install-native.sh brings everything else
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# (docker, tailscale, git, tmux, agents) via arch.packages.
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# kitty-terminfo: without it, SSHing in from kitty gives
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# "'xterm-kitty': unknown terminal type" and interactive tools die
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pacman -S --noconfirm --needed \
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ufw \
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fail2ban \
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curl \
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kitty-terminfo \
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pacman-contrib
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log "System updated, hardening packages installed"
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# =============================================================================
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# 2. TIMEZONE & LOCALE
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# =============================================================================
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step "2/9 · Hostname, timezone & locale"
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# Machine name becomes the hostname — omaterm-setup's tailnet prompt
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# defaults to it, so the name is only ever typed once
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hostnamectl set-hostname "$SSH_ALIAS"
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log "Hostname set to $SSH_ALIAS"
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timedatectl set-timezone "$TIMEZONE"
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log "Timezone set to $TIMEZONE"
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# Generate and set locale (minimal Arch cloud images often ship C.UTF-8 only)
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if ! locale -a 2>/dev/null | grep -qi "^${LOCALE/UTF-8/utf8}$"; then
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sed -i "s/^#${LOCALE}/${LOCALE}/" /etc/locale.gen
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locale-gen
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fi
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echo "LANG=$LOCALE" > /etc/locale.conf
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log "Locale set to $LOCALE"
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# =============================================================================
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# 3. CREATE DEPLOY USER
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# =============================================================================
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step "3/9 · Deploy user"
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if id "$DEPLOY_USER" &>/dev/null; then
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warn "User '$DEPLOY_USER' already exists — skipping creation"
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else
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useradd -m -s /bin/bash "$DEPLOY_USER"
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usermod -aG wheel "$DEPLOY_USER"
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log "User '$DEPLOY_USER' created and added to wheel group"
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fi
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# Passwordless sudo — install-native.sh and omaterm-setup sudo freely,
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# and the user has no password to type
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echo "$DEPLOY_USER ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/"$DEPLOY_USER"
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chmod 440 /etc/sudoers.d/"$DEPLOY_USER"
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log "Passwordless sudo enabled for $DEPLOY_USER"
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# Pre-seed git identity — omaterm-setup skips its git prompts when
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# user.name and user.email are already configured
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if [ -n "$GIT_NAME" ] && [ ! -f /home/"$DEPLOY_USER"/.gitconfig ]; then
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cat > /home/"$DEPLOY_USER"/.gitconfig << GITEOF
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[user]
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name = $GIT_NAME
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email = $GIT_EMAIL
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GITEOF
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chown "$DEPLOY_USER":"$DEPLOY_USER" /home/"$DEPLOY_USER"/.gitconfig
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log "Git identity pre-seeded for $DEPLOY_USER"
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fi
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# Copy root's authorized_keys to deploy user if they exist
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if [ -f /root/.ssh/authorized_keys ]; then
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mkdir -p /home/"$DEPLOY_USER"/.ssh
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cp /root/.ssh/authorized_keys /home/"$DEPLOY_USER"/.ssh/authorized_keys
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chown -R "$DEPLOY_USER":"$DEPLOY_USER" /home/"$DEPLOY_USER"/.ssh
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chmod 700 /home/"$DEPLOY_USER"/.ssh
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chmod 600 /home/"$DEPLOY_USER"/.ssh/authorized_keys
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log "SSH keys copied from root to $DEPLOY_USER"
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else
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warn "No SSH keys found for root — you'll need to add keys manually:"
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warn " ssh-copy-id $DEPLOY_USER@YOUR_SERVER_IP"
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fi
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# =============================================================================
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# 4. HARDEN SSH
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# =============================================================================
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step "4/9 · SSH hardening"
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# Backup original config
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cp /etc/ssh/sshd_config "/etc/ssh/sshd_config.backup.$(date +%Y%m%d)"
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# Neutralise conflicting directives in the main config so our drop-in wins
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sed -i 's/^\s*PermitRootLogin\b/#&/' /etc/ssh/sshd_config
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sed -i 's/^\s*PasswordAuthentication\b/#&/' /etc/ssh/sshd_config
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sed -i 's/^\s*PubkeyAuthentication\b/#&/' /etc/ssh/sshd_config
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sed -i 's/^\s*X11Forwarding\b/#&/' /etc/ssh/sshd_config
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sed -i 's/^\s*PermitEmptyPasswords\b/#&/' /etc/ssh/sshd_config
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log "Commented out conflicting directives in sshd_config"
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# Remove cloud-init SSH overrides that can conflict (some VPS images use them)
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rm -f /etc/ssh/sshd_config.d/50-cloud-init.conf
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# Ensure the drop-in directory is included (Arch's stock sshd_config has this,
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# but some provider images strip it)
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mkdir -p /etc/ssh/sshd_config.d
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if ! grep -q '^Include /etc/ssh/sshd_config.d/\*\.conf' /etc/ssh/sshd_config; then
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sed -i '1i Include /etc/ssh/sshd_config.d/*.conf' /etc/ssh/sshd_config
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warn "Added missing Include for sshd_config.d drop-ins"
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fi
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cat > /etc/ssh/sshd_config.d/hardened.conf << EOF
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# Custom SSH hardening
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PermitRootLogin no
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PasswordAuthentication no
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PubkeyAuthentication yes
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MaxAuthTries 3
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MaxSessions 5
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AllowUsers $DEPLOY_USER
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ClientAliveInterval 300
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ClientAliveCountMax 2
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X11Forwarding no
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PermitEmptyPasswords no
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EOF
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log "SSH hardened — root disabled, key-only auth"
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# Test config before restarting (service is 'sshd' on Arch, not 'ssh')
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if sshd -t; then
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systemctl restart sshd
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log "SSH restarted successfully"
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else
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err "SSH config test failed — reverting"
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rm /etc/ssh/sshd_config.d/hardened.conf
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exit 1
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fi
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# =============================================================================
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# 5. FIREWALL (UFW)
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# =============================================================================
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step "5/9 · Firewall (UFW)"
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ufw default deny incoming
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ufw default allow outgoing
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ufw allow 22/tcp comment 'SSH'
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# Native omaterm runs tailscaled on the host (kernel networking, tun
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# device) — without this, incoming tailnet traffic is silently dropped
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ufw allow in on tailscale0 comment 'Tailscale'
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# Enable without prompt, and make it survive reboots
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echo "y" | ufw enable
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systemctl enable ufw
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log "UFW enabled — 22/tcp + tailscale0 only"
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ufw status verbose
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# =============================================================================
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# 6. FAIL2BAN
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# =============================================================================
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step "6/9 · Fail2ban"
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# Arch logs auth to the systemd journal — there is no /var/log/auth.log,
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# so use the systemd backend instead of a logpath
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cat > /etc/fail2ban/jail.local << EOF
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[DEFAULT]
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bantime = 3600
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findtime = 600
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maxretry = 3
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banaction = ufw
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backend = systemd
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[sshd]
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enabled = true
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port = 22
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filter = sshd
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maxretry = 3
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bantime = 3600
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EOF
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systemctl enable fail2ban
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systemctl restart fail2ban
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log "Fail2ban configured and running (systemd journal backend)"
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# =============================================================================
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# 7. AUTOMATIC UPDATES (weekly pacman -Syu timer)
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# =============================================================================
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step "7/9 · Automatic updates"
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# Arch has no unattended-upgrades equivalent — use a weekly full update timer.
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# NOTE: rolling release means an update can very occasionally need manual
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# intervention (check https://archlinux.org/news/ if something breaks).
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cat > /etc/systemd/system/pacman-update.service << EOF
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[Unit]
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Description=Weekly pacman system update
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=oneshot
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ExecStart=/usr/bin/pacman -Syu --noconfirm
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EOF
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cat > /etc/systemd/system/pacman-update.timer << EOF
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[Unit]
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Description=Weekly pacman system update
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[Timer]
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OnCalendar=weekly
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RandomizedDelaySec=1h
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Persistent=true
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[Install]
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WantedBy=timers.target
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EOF
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systemctl daemon-reload
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systemctl enable --now pacman-update.timer
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log "Weekly auto-update timer enabled (pacman-update.timer)"
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warn "Rolling release: check 'journalctl -u pacman-update' if anything misbehaves after an update"
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# =============================================================================
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# 8. HOUSEKEEPING — swap, services, journal, pacman cache
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# =============================================================================
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step "8/9 · Housekeeping"
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# --- Swap (2GB) ---
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if swapon --show --noheadings 2>/dev/null | grep -q .; then
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warn "Swap already active — skipping:"
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swapon --show
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elif [ -f /swapfile ]; then
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warn "Swap file already exists — skipping"
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else
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# fallocate swapfiles fail on btrfs (needs NOCOW) — use the proper tool
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if [ "$(findmnt -n -o FSTYPE /)" = "btrfs" ]; then
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btrfs filesystem mkswapfile --size 2g /swapfile
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else
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dd if=/dev/zero of=/swapfile bs=1M count=2048 status=none
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chmod 600 /swapfile
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mkswap /swapfile
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fi
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swapon /swapfile
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grep -q '/swapfile' /etc/fstab || echo '/swapfile none swap sw 0 0' >> /etc/fstab
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log "2GB swap created and enabled"
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fi
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# --- Disable unnecessary services ---
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for svc in ModemManager udisks2 multipathd; do
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if systemctl is-enabled "$svc" &>/dev/null; then
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systemctl stop "$svc"
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systemctl disable "$svc"
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log "Disabled $svc"
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fi
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done
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# --- Cap journal logs (50MB) ---
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mkdir -p /etc/systemd/journald.conf.d
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cat > /etc/systemd/journald.conf.d/size.conf << EOF
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[Journal]
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SystemMaxUse=50M
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EOF
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systemctl restart systemd-journald
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log "Journal capped at 50MB"
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# --- Pacman cache hygiene (keep last versions, prune weekly) ---
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systemctl enable --now paccache.timer
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log "paccache.timer enabled — old package versions pruned weekly"
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# =============================================================================
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# 9. OMATERM HANDOFF
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# =============================================================================
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step "9/9 · Omaterm handoff"
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|
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# Pre-seed the tailnet machine name — omaterm-setup's hostname prompt
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# defaults to this file's contents, so Enter accepts the machine name
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echo "$SSH_ALIAS" > /etc/omaterm-tailscale-hostname
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|
|
|
# Re-runnable installer wrapper in the deploy user's home. Download-then-run
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|
# (not curl | bash) so stdin stays on the real TTY — the installer's
|
|
# interactive first-run setup (gum) and final shell handoff need it.
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|
cat > /home/"$DEPLOY_USER"/install-omaterm << OMAEOF
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|
#!/bin/bash
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|
# Fetch and run the omaterm native installer (28allday fork, native-frozen)
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|
# with a real TTY on stdin. Re-run this if the install is interrupted
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|
# (e.g. after a kernel-upgrade reboot).
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|
set -uo pipefail
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|
tmp=\$(mktemp)
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trap 'rm -f "\$tmp"' EXIT
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curl -fsSL $OMATERM_REPO_RAW/install-native.sh -o "\$tmp" || exit 1
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|
|
|
OMATERM_REF=native-frozen bash "\$tmp"
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|
|
|
# On success install-native.sh execs into a login shell and never returns —
|
|
# reaching this point means the chain bailed early (a first-run setup
|
|
# section erroring out, a stray Ctrl+C). Don't strand the user by dropping
|
|
# the SSH session: resume setup if it didn't finish, then land in a shell.
|
|
echo ""
|
|
echo "[!] The installer exited early — recovering."
|
|
if [ ! -f "\$HOME/.omaterm-setup-done" ] && [ -x "\$HOME/.local/bin/omaterm-setup" ]; then
|
|
echo "[!] Resuming first-run setup (already-completed sections are skipped)..."
|
|
"\$HOME/.local/bin/omaterm-setup" || true
|
|
fi
|
|
exec bash -l
|
|
OMAEOF
|
|
|
|
chown "$DEPLOY_USER":"$DEPLOY_USER" /home/"$DEPLOY_USER"/install-omaterm
|
|
chmod +x /home/"$DEPLOY_USER"/install-omaterm
|
|
log "Installer wrapper created at ~$DEPLOY_USER/install-omaterm"
|
|
|
|
# =============================================================================
|
|
# LOCAL SSH CONFIG SNIPPET
|
|
# =============================================================================
|
|
|
|
cat > /home/"$DEPLOY_USER"/ssh-config-snippet.txt << SSHEOF
|
|
Host $SSH_ALIAS
|
|
HostName $SERVER_IP
|
|
User $DEPLOY_USER
|
|
IdentityFile ~/.ssh/id_ed25519
|
|
SSHEOF
|
|
|
|
chown "$DEPLOY_USER":"$DEPLOY_USER" /home/"$DEPLOY_USER"/ssh-config-snippet.txt
|
|
|
|
# Hardening phase complete — saved answers no longer needed
|
|
rm -f "$STATE_FILE"
|
|
|
|
# =============================================================================
|
|
# SUMMARY
|
|
# =============================================================================
|
|
|
|
echo ""
|
|
echo -e "${CYAN}"
|
|
echo "╔══════════════════════════════════════════════════════════════╗"
|
|
echo "║ HARDENING COMPLETE ║"
|
|
echo "╚══════════════════════════════════════════════════════════════╝"
|
|
echo -e "${NC}"
|
|
echo ""
|
|
echo -e " ${GREEN}SSH${NC}"
|
|
echo " ├─ User: $DEPLOY_USER"
|
|
echo " ├─ Root login: disabled"
|
|
echo " └─ Auth: key-only"
|
|
echo ""
|
|
echo -e " ${GREEN}Firewall${NC}"
|
|
echo " ├─ 22/tcp SSH"
|
|
echo " └─ tailscale0 allowed (for omaterm's tailscale up --ssh)"
|
|
echo ""
|
|
echo -e " ${GREEN}Services${NC}"
|
|
echo " ├─ Fail2ban: active (systemd backend)"
|
|
echo " └─ Auto-updates: weekly pacman-update.timer"
|
|
echo ""
|
|
echo " 1. On your local machine, add the SSH config:"
|
|
echo ""
|
|
echo -e " ${CYAN}────── COPY BELOW THIS LINE ──────${NC}"
|
|
echo ""
|
|
echo "cat >> ~/.ssh/config << 'EOF'"
|
|
echo ""
|
|
echo "Host $SSH_ALIAS"
|
|
echo " HostName $SERVER_IP"
|
|
echo " User $DEPLOY_USER"
|
|
echo " IdentityFile ~/.ssh/id_ed25519"
|
|
echo "EOF"
|
|
echo ""
|
|
echo -e " ${CYAN}────── COPY ABOVE THIS LINE ──────${NC}"
|
|
echo ""
|
|
echo " 2. The omaterm install runs next, as $DEPLOY_USER. If it's"
|
|
echo " interrupted (e.g. a kernel-upgrade reboot), resume with:"
|
|
echo ""
|
|
echo -e " ${CYAN}ssh -t $SSH_ALIAS ./install-omaterm${NC}"
|
|
echo ""
|
|
echo -e " ${YELLOW}Heads-up — after the packages install, first-run setup asks about:${NC}"
|
|
echo ""
|
|
if [ -n "$GIT_NAME" ]; then
|
|
echo " · Git identity skipped — already configured"
|
|
else
|
|
echo " · Git identity your name + email"
|
|
fi
|
|
echo " · GitHub optional, wants a classic token"
|
|
echo " · Tailscale recommended — browser login link;"
|
|
echo " hostname pre-filled ($SSH_ALIAS), Enter accepts"
|
|
echo -e " · SSH public key ${YELLOW}answer No${NC} — this box is already key-only"
|
|
echo " · 1Password optional"
|
|
echo ""
|
|
echo -e " ${YELLOW}A reboot is recommended once you're done, to apply kernel updates.${NC}"
|
|
echo ""
|
|
|
|
read -p "Launch the omaterm installer now as $DEPLOY_USER? (Y/n) " -n 1 -r
|
|
echo ""
|
|
if [[ ! $REPLY =~ ^[Nn]$ ]]; then
|
|
# su keeps the controlling TTY, so gum prompts and the final
|
|
# `exec bash -l` in install-native.sh all work
|
|
exec su - "$DEPLOY_USER" -c ./install-omaterm
|
|
else
|
|
echo ""
|
|
echo " When you're ready:"
|
|
echo ""
|
|
echo -e " ${CYAN}ssh -t $SSH_ALIAS ./install-omaterm${NC}"
|
|
echo ""
|
|
fi
|