Initial commit: VaultMesh Skills collection

Collection of operational skills for VaultMesh infrastructure including: - backup-sovereign: Backup and recovery operations - btc-anchor: Bitcoin anchoring - cloudflare-tunnel-manager: Cloudflare tunnel management - container-registry: Container registry operations - disaster-recovery: Disaster recovery procedures - dns-sovereign: DNS management - eth-anchor: Ethereum anchoring - gitea-bootstrap: Gitea setup and configuration - hetzner-bootstrap: Hetzner server provisioning - merkle-forest: Merkle tree operations - node-hardening: Node security hardening - operator-bootstrap: Operator initialization - proof-verifier: Cryptographic proof verification - rfc3161-anchor: RFC3161 timestamping - secrets-vault: Secrets management 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-27 00:25:00 +00:00
commit eac77ef7b4
213 changed files with 11724 additions and 0 deletions
--- a/hetzner-bootstrap/scripts/00_preflight.sh
+++ b/hetzner-bootstrap/scripts/00_preflight.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${NODE_NAME:=}"
+: "${SOVEREIGN_USER:=sovereign}"
+: "${SSH_PUBLIC_KEY:=}"
+: "${SSH_PORT:=}"                 # optional; auto-detect in apply if unset
+: "${INSTALL_CLOUDFLARED:=true}"
+: "${INSTALL_WIREGUARD:=true}"
+: "${WG_PORT:=51820}"
+
+main() {
+  require_root
+
+  [[ -n "$NODE_NAME" ]] || die "NODE_NAME is required"
+  [[ -n "$SSH_PUBLIC_KEY" ]] || die "SSH_PUBLIC_KEY is required"
+
+  # Required baseline tools for a typical Hetzner Debian/Ubuntu image.
+  need apt
+  need systemctl
+  need hostnamectl
+  need sed
+  need grep
+  need getent
+  need id
+  need chmod
+  need chown
+
+  # Soft checks: these may be installed during apply.
+  if ! command -v ufw >/dev/null 2>&1; then
+    log_warn "ufw not found (will be installed during apply)."
+  fi
+  if ! command -v sshd >/dev/null 2>&1; then
+    log_warn "sshd not found (openssh-server may be installed during apply)."
+  fi
+  if [[ "$INSTALL_WIREGUARD" == "true" ]] && ! command -v wg >/dev/null 2>&1; then
+    log_warn "wg not found (wireguard will be installed during apply)."
+  fi
+
+  if [[ "$INSTALL_CLOUDFLARED" == "true" ]]; then
+    if ! command -v curl >/dev/null 2>&1; then
+      log_warn "curl not found (will be installed during apply)."
+    fi
+    if ! command -v gpg >/dev/null 2>&1; then
+      log_warn "gpg not found (will be installed during apply via gnupg)."
+    fi
+    code="$(os_codename)"
+    if [[ -z "$code" ]]; then
+      log_warn "Could not determine OS codename in preflight; apply will attempt again."
+    else
+      log_info "OS codename detected: $code"
+    fi
+  fi
+
+  if [[ -n "$SSH_PORT" ]]; then
+    log_info "SSH_PORT override set: $SSH_PORT"
+  fi
+
+  log_info "Preflight OK."
+  log_info "Reminder: keep an open root session until sovereign access is verified."
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/10_plan.sh
+++ b/hetzner-bootstrap/scripts/10_plan.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${SERVER_IP:=}"
+: "${NODE_NAME:=}"
+: "${SOVEREIGN_USER:=sovereign}"
+: "${SSH_PUBLIC_KEY:=}"
+: "${SSH_PORT:=}"                 # optional: if unset, apply auto-detects current sshd port (fallback 22)
+: "${ALLOW_SSH_FALLBACK_22:=true}"# safety: keep 22 open if SSH_PORT != 22
+: "${WG_PORT:=51820}"
+: "${INSTALL_CLOUDFLARED:=true}"
+: "${INSTALL_WIREGUARD:=true}"
+
+main() {
+  require_root
+  [[ -n "$NODE_NAME" ]] || die "NODE_NAME required"
+  [[ -n "$SSH_PUBLIC_KEY" ]] || die "SSH_PUBLIC_KEY required"
+
+  echo "[PLAN] $(date -Iseconds) hetzner-bootstrap"
+  echo "[PLAN] Server IP: ${SERVER_IP:-<unknown>}"
+  echo "[PLAN] Hostname: $NODE_NAME"
+  echo "[PLAN] Sovereign user: $SOVEREIGN_USER"
+  echo "[PLAN] SSH port allowance:"
+  if [[ -n "$SSH_PORT" ]]; then
+    echo "       - Will allow SSH_PORT=${SSH_PORT}/tcp"
+    if [[ "$ALLOW_SSH_FALLBACK_22" == "true" && "$SSH_PORT" != "22" ]]; then
+      echo "       - Safety fallback: also allow 22/tcp"
+    fi
+  else
+    echo "       - SSH_PORT not set: apply will auto-detect current sshd port (fallback 22) and allow it"
+  fi
+  echo "[PLAN] UFW: allow SSH port(s) + allow ${WG_PORT}/udp BEFORE enable; default deny incoming"
+  echo "[PLAN] SSH hardening: PermitRootLogin no, PasswordAuthentication no, validate with sshd -t, reload ssh service"
+  echo "[PLAN] cloudflared install: $INSTALL_CLOUDFLARED"
+  echo "[PLAN] wireguard package install: $INSTALL_WIREGUARD"
+  echo
+  echo "[PLAN] Next: export DRY_RUN=0 && ./scripts/11_apply.sh"
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/11_apply.sh
+++ b/hetzner-bootstrap/scripts/11_apply.sh
@@ -0,0 +1,196 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${NODE_NAME:=}"
+: "${SOVEREIGN_USER:=sovereign}"
+: "${SSH_PUBLIC_KEY:=}"
+: "${SSH_PORT:=}"                   # optional; auto-detect if unset
+: "${ALLOW_SSH_FALLBACK_22:=true}"  # if SSH_PORT != 22, keep 22 open as safety net
+: "${WG_PORT:=51820}"
+: "${INSTALL_CLOUDFLARED:=true}"
+: "${INSTALL_WIREGUARD:=true}"
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+: "${BACKUP_DIR:=$OUTPUT_DIR/backups}"
+
+install_cloudflared() {
+  log_info "Installing cloudflared apt repo + package..."
+  need curl
+  need gpg
+
+  mkdir -p /usr/share/keyrings
+  curl -fsSL https://pkg.cloudflare.com/cloudflare-main.gpg | gpg --dearmor -o /usr/share/keyrings/cloudflare-main.gpg
+
+  local code
+  code="$(os_codename)"
+  [[ -n "$code" ]] || die "Could not determine OS codename for cloudflared apt repo."
+
+  cat > /etc/apt/sources.list.d/cloudflared.list <<EOF
+deb [signed-by=/usr/share/keyrings/cloudflare-main.gpg] https://pkg.cloudflare.com/cloudflared ${code} main
+EOF
+  apt update
+  apt install -y cloudflared
+}
+
+detect_sshd_port() {
+  # Prefer sshd -T output if available; otherwise fall back to 22.
+  local p=""
+  if command -v sshd >/dev/null 2>&1; then
+    p="$(sshd -T 2>/dev/null | awk '/^port /{print $2; exit}' || true)"
+  fi
+  echo "${p:-22}"
+}
+
+ensure_authorized_key() {
+  local user="$1"
+  local key_line="$2"
+  local homedir="$3"
+  local ssh_dir="$homedir/.ssh"
+  local auth_file="$ssh_dir/authorized_keys"
+
+  install -d -m 700 -o "$user" -g "$user" "$ssh_dir"
+  touch "$auth_file"
+  chown "$user:$user" "$auth_file"
+  chmod 600 "$auth_file"
+
+  # Normalize comparison to "type base64" (ignore comment).
+  local key_norm
+  key_norm="$(echo "$key_line" | awk '{print $1" "$2}')"
+  if [[ -z "$key_norm" ]]; then
+    die "SSH_PUBLIC_KEY appears invalid (expected: <type> <base64> [comment])"
+  fi
+
+  if awk '{print $1" "$2}' "$auth_file" | grep -qxF "$key_norm"; then
+    log_info "authorized_keys already contains this key (idempotent)."
+  else
+    echo "$key_line" >> "$auth_file"
+    log_info "Appended key to $auth_file"
+  fi
+}
+
+harden_sshd_config_safely() {
+  local cfg="/etc/ssh/sshd_config"
+  local before="$BACKUP_DIR/sshd_config.before"
+
+  [[ -f "$cfg" ]] || die "Missing $cfg"
+
+  mkdir -p "$BACKUP_DIR"
+  if [[ ! -f "$before" ]]; then
+    cp -p "$cfg" "$before"
+  fi
+  backup_file "$cfg" "$BACKUP_DIR"
+
+  local restore_on_exit="1"
+  trap 'if [[ "$restore_on_exit" == "1" ]]; then log_warn "Restoring sshd_config from backup due to failure."; cp -p "$before" "$cfg" || true; reload_ssh_service; fi' EXIT
+
+  # Conservative replacements: add if missing, otherwise modify.
+  if grep -qE '^\s*#?\s*PermitRootLogin' "$cfg"; then
+    sed -i 's/^\s*#\?\s*PermitRootLogin.*/PermitRootLogin no/' "$cfg"
+  else
+    echo "PermitRootLogin no" >> "$cfg"
+  fi
+
+  if grep -qE '^\s*#?\s*PasswordAuthentication' "$cfg"; then
+    sed -i 's/^\s*#\?\s*PasswordAuthentication.*/PasswordAuthentication no/' "$cfg"
+  else
+    echo "PasswordAuthentication no" >> "$cfg"
+  fi
+
+  # Validate before reload.
+  sshd -t || die "sshd config validation failed (restoring)."
+
+  restore_on_exit="0"
+  trap - EXIT
+
+  reload_ssh_service
+
+  if ! is_ssh_active; then
+    die "SSH service is not active after reload. Use rollback/emergency_restore_ssh_ufw.sh from console."
+  fi
+}
+
+main() {
+  require_root
+  confirm_gate
+  [[ -n "$NODE_NAME" ]] || die "NODE_NAME required"
+  [[ -n "$SSH_PUBLIC_KEY" ]] || die "SSH_PUBLIC_KEY required"
+
+  mkdir -p "$OUTPUT_DIR" "$BACKUP_DIR"
+
+  log_info "1) Base packages"
+  apt update
+  apt install -y gnupg pass git curl jq htop tmux vim ufw fail2ban
+
+  # Ensure OpenSSH server exists (some minimal images may not).
+  if ! command -v sshd >/dev/null 2>&1; then
+    log_warn "openssh-server not found; installing..."
+    apt install -y openssh-server
+  fi
+
+  # Ensure host keys exist (sshd -t / sshd -T can fail without them)
+  if command -v ssh-keygen >/dev/null 2>&1; then
+    ssh-keygen -A >/dev/null 2>&1 || true
+  fi
+
+  # Ensure SSH service is enabled/running
+  restart_ssh_service
+
+  if [[ "$INSTALL_WIREGUARD" == "true" ]]; then
+    apt install -y wireguard
+  fi
+
+  if [[ "$INSTALL_CLOUDFLARED" == "true" ]]; then
+    install_cloudflared
+  fi
+
+  log_info "2) Create sovereign user + authorized_keys (idempotent)"
+  if id "$SOVEREIGN_USER" >/dev/null 2>&1; then
+    log_warn "User exists: $SOVEREIGN_USER"
+  else
+    useradd -m -s /bin/bash -G sudo "$SOVEREIGN_USER"
+  fi
+
+  homedir="$(getent passwd "$SOVEREIGN_USER" | cut -d: -f6)"
+  [[ -n "$homedir" ]] || die "Could not resolve homedir for $SOVEREIGN_USER"
+  ensure_authorized_key "$SOVEREIGN_USER" "$SSH_PUBLIC_KEY" "$homedir"
+
+  log_info "3) Set hostname"
+  hostnamectl set-hostname "$NODE_NAME"
+  if ! grep -q "127.0.1.1 $NODE_NAME" /etc/hosts 2>/dev/null; then
+    echo "127.0.1.1 $NODE_NAME" >> /etc/hosts
+  fi
+
+  log_info "4) Configure UFW (SSH + WG ports BEFORE enable)"
+  backup_file "/etc/ufw/user.rules" "$BACKUP_DIR"
+
+  # Auto-detect current sshd port if SSH_PORT unset.
+  current_port="$(detect_sshd_port)"
+  if [[ -z "$SSH_PORT" ]]; then
+    SSH_PORT="$current_port"
+  fi
+
+  # Always allow the chosen SSH_PORT. If you are migrating ports, keep 22 open as a safety net.
+  ufw allow "${SSH_PORT}/tcp"
+  if [[ "$ALLOW_SSH_FALLBACK_22" == "true" && "$SSH_PORT" != "22" ]]; then
+    ufw allow "22/tcp"
+  fi
+  # If auto-detected differs (rare), keep it open too.
+  if [[ "$current_port" != "$SSH_PORT" ]]; then
+    ufw allow "${current_port}/tcp"
+  fi
+
+  ufw allow "${WG_PORT}/udp"
+  ufw default deny incoming
+  ufw default allow outgoing
+  ufw --force enable
+  ufw status verbose > "$OUTPUT_DIR/ufw_status_after.txt" || true
+
+  log_info "5) Harden SSH (reload-safe + restore-on-failure)"
+  harden_sshd_config_safely
+
+  log_info "Bootstrap apply complete."
+  log_info "NEXT: open a second session as the sovereign user before closing root."
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/20_wireguard_plan.sh
+++ b/hetzner-bootstrap/scripts/20_wireguard_plan.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${WG_PORT:=51820}"
+: "${WG_CIDR:=10.200.0.1/24}"
+
+main() {
+  require_root
+  echo "[PLAN] $(date -Iseconds) WireGuard scaffold"
+  echo "[PLAN] Will generate keys in /etc/wireguard/{privatekey,publickey} (private is 0600 root:root)"
+  echo "[PLAN] Will write /etc/wireguard/wg0.conf with:"
+  echo "       Address=$WG_CIDR"
+  echo "       ListenPort=$WG_PORT"
+  echo "       PrivateKey=(read from /etc/wireguard/privatekey)"
+  echo "[PLAN] Will enable + start wg-quick@wg0"
+  echo
+  echo "[PLAN] Next: export DRY_RUN=0 && ./scripts/21_wireguard_apply.sh"
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/21_wireguard_apply.sh
+++ b/hetzner-bootstrap/scripts/21_wireguard_apply.sh
@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${WG_PORT:=51820}"
+: "${WG_CIDR:=10.200.0.1/24}"
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+: "${BACKUP_DIR:=$OUTPUT_DIR/backups}"
+
+main() {
+  require_root
+  confirm_gate
+  need wg
+  mkdir -p "$OUTPUT_DIR" "$BACKUP_DIR"
+  mkdir -p /etc/wireguard
+
+  backup_file "/etc/wireguard/wg0.conf" "$BACKUP_DIR"
+
+  if [[ ! -f /etc/wireguard/privatekey ]]; then
+    log_info "Generating WireGuard keys..."
+    wg genkey | tee /etc/wireguard/privatekey | wg pubkey > /etc/wireguard/publickey
+    chown root:root /etc/wireguard/privatekey /etc/wireguard/publickey
+    chmod 600 /etc/wireguard/privatekey
+    chmod 644 /etc/wireguard/publickey || true
+  else
+    log_warn "WireGuard privatekey exists; not overwriting."
+  fi
+
+  privkey="$(cat /etc/wireguard/privatekey)"
+  cat > /etc/wireguard/wg0.conf <<EOF
+[Interface]
+Address = $WG_CIDR
+ListenPort = $WG_PORT
+PrivateKey = $privkey
+
+# Add peers below. Never commit private keys to git.
+# [Peer]
+# PublicKey = <peer-public-key>
+# AllowedIPs = 10.200.0.2/32
+EOF
+  chmod 600 /etc/wireguard/wg0.conf
+
+  systemctl enable wg-quick@wg0
+  systemctl start wg-quick@wg0
+
+  log_info "WireGuard started. Public key:"
+  cat /etc/wireguard/publickey | tee "$OUTPUT_DIR/wireguard_publickey.txt"
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/90_verify.sh
+++ b/hetzner-bootstrap/scripts/90_verify.sh
@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${NODE_NAME:=}"
+: "${SOVEREIGN_USER:=sovereign}"
+: "${WG_PORT:=51820}"
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+
+main() {
+  require_root
+  status="$OUTPUT_DIR/status_matrix.json"
+  mkdir -p "$OUTPUT_DIR"
+
+  ok_user=false; ok_hostname=false; ok_ufw=false; ok_ssh=false; ok_wg=false
+
+  id "$SOVEREIGN_USER" >/dev/null 2>&1 && ok_user=true
+  [[ -n "$NODE_NAME" ]] && hostname | grep -q "$NODE_NAME" && ok_hostname=true || true
+  ufw status 2>/dev/null | grep -qi "Status: active" && ok_ufw=true || true
+  sshd -t >/dev/null 2>&1 && ok_ssh=true || true
+  systemctl is-active wg-quick@wg0 >/dev/null 2>&1 && ok_wg=true || true
+
+  blockers="[]"
+  if [[ "$ok_user" != "true" ]]; then blockers='["missing_sovereign_user"]'
+  elif [[ "$ok_ufw" != "true" ]]; then blockers='["ufw_not_active"]'
+  elif [[ "$ok_ssh" != "true" ]]; then blockers='["sshd_config_invalid"]'
+  fi
+
+  cat > "$status" <<EOF
+{
+  "skill":"hetzner-bootstrap",
+  "timestamp":"$(date -Iseconds)",
+  "checks":[
+    {"name":"sovereign_user_present","ok": $ok_user, "user":"$(json_escape "$SOVEREIGN_USER")"},
+    {"name":"hostname_set","ok": $ok_hostname, "hostname":"$(json_escape "$(hostname)")"},
+    {"name":"ufw_active","ok": $ok_ufw, "wg_port":"$(json_escape "$WG_PORT")"},
+    {"name":"sshd_config_valid","ok": $ok_ssh},
+    {"name":"wireguard_active_optional","ok": $ok_wg}
+  ],
+  "blockers": $blockers,
+  "warnings": [],
+  "next_steps": ["verify sovereign SSH login", "operator-bootstrap", "secrets-vault", "cloudflare-tunnel-manager"]
+}
+EOF
+
+  log_info "Wrote $status"
+  cat "$status"
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/99_report.sh
+++ b/hetzner-bootstrap/scripts/99_report.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+source "$SCRIPT_DIR/_common.sh"
+
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+
+main() {
+  report="$OUTPUT_DIR/audit_report.md"
+  status="$OUTPUT_DIR/status_matrix.json"
+  ufw_out="$OUTPUT_DIR/ufw_status_after.txt"
+  wg_pub="$OUTPUT_DIR/wireguard_publickey.txt"
+
+  cat > "$report" <<EOF
+# Hetzner Bootstrap Audit Report
+
+**Generated:** $(date -Iseconds)  
+**Skill Version:** 1.0.0
+
+## Status Matrix
+
+$(if [[ -f "$status" ]]; then echo '```json'; cat "$status"; echo '```'; else echo "_Missing status_matrix.json_"; fi)
+
+## UFW Snapshot (after)
+
+$(if [[ -f "$ufw_out" ]]; then echo '```'; cat "$ufw_out"; echo '```'; else echo "_No ufw snapshot captured._"; fi)
+
+## WireGuard Public Key (if generated)
+
+$(if [[ -f "$wg_pub" ]]; then echo '```'; cat "$wg_pub"; echo '```'; else echo "_No wg public key captured._"; fi)
+
+## Rollback
+
+- SSH/UFW emergency restore: \`./scripts/rollback/emergency_restore_ssh_ufw.sh\`
+- WireGuard undo: \`./scripts/rollback/undo_wireguard.sh\`
+
+## EU Compliance
+
+Hetzner EU DC (Germany/Finland). Local-first node operations; public services should be via Cloudflare Tunnel.
+EOF
+
+  log_info "Wrote $report"
+  cat "$report"
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/_common.sh
+++ b/hetzner-bootstrap/scripts/_common.sh
@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+log_info(){ echo "[INFO]  $(date -Iseconds) $*"; }
+log_warn(){ echo "[WARN]  $(date -Iseconds) $*" >&2; }
+log_error(){ echo "[ERROR] $(date -Iseconds) $*" >&2; }
+die(){ log_error "$*"; exit 1; }
+need(){ command -v "$1" >/dev/null 2>&1 || die "Missing required tool: $1"; }
+
+confirm_gate() {
+  : "${DRY_RUN:=1}"
+  : "${REQUIRE_CONFIRM:=1}"
+  : "${CONFIRM_PHRASE:=I UNDERSTAND THIS CAN AFFECT REMOTE ACCESS}"
+
+  [[ "$DRY_RUN" == "0" ]] || die "DRY_RUN=$DRY_RUN (set DRY_RUN=0)."
+  if [[ "$REQUIRE_CONFIRM" == "1" ]]; then
+    echo "Type to confirm:"
+    echo "  $CONFIRM_PHRASE"
+    echo
+    read -r -p "> " typed
+    [[ "$typed" == "$CONFIRM_PHRASE" ]] || die "Confirmation phrase did not match."
+  fi
+}
+
+require_root() {
+  [[ "$(id -u)" == "0" ]] || die "Run as root."
+}
+
+backup_file() {
+  local src="$1" backup_dir="$2"
+  mkdir -p "$backup_dir"
+  if [[ -f "$src" ]]; then
+    local ts; ts="$(date -Iseconds | tr ':' '-')"
+    cp -p "$src" "$backup_dir/$(basename "$src").${ts}.bak"
+  fi
+}
+
+os_codename() {
+  # Prefer /etc/os-release (present on Debian/Ubuntu).
+  local code=""
+  if [[ -r /etc/os-release ]]; then
+    # shellcheck disable=SC1091
+    . /etc/os-release
+    code="${VERSION_CODENAME:-}"
+  fi
+  if [[ -z "$code" ]] && command -v lsb_release >/dev/null 2>&1; then
+    code="$(lsb_release -cs 2>/dev/null || true)"
+  fi
+  echo "$code"
+}
+
+ssh_service_name() {
+  # Debian/Ubuntu commonly use "ssh.service". Some distros use "sshd.service".
+  if systemctl status ssh >/dev/null 2>&1; then
+    echo "ssh"
+    return 0
+  fi
+  if systemctl status sshd >/dev/null 2>&1; then
+    echo "sshd"
+    return 0
+  fi
+  # Fallback
+  echo "ssh"
+}
+
+reload_ssh_service() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl reload "$svc" >/dev/null 2>&1 || systemctl restart "$svc" >/dev/null 2>&1 || true
+}
+
+restart_ssh_service() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl restart "$svc" >/dev/null 2>&1 || true
+}
+
+is_ssh_active() {
+  local svc; svc="$(ssh_service_name)"
+  systemctl is-active "$svc" >/dev/null 2>&1
+}
--- a/hetzner-bootstrap/scripts/rollback/emergency_restore_ssh_ufw.sh
+++ b/hetzner-bootstrap/scripts/rollback/emergency_restore_ssh_ufw.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
+source "$SKILL_ROOT/scripts/_common.sh"
+
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+: "${BACKUP_DIR:=$OUTPUT_DIR/backups}"
+
+main() {
+  require_root
+  confirm_gate
+  log_warn "Emergency restore: attempting to relax UFW + restore sshd_config from backup."
+  ufw --force disable >/dev/null 2>&1 || true
+
+  # Prefer the stable "before" snapshot if present.
+  if [[ -f "$BACKUP_DIR/sshd_config.before" ]]; then
+    latest="$BACKUP_DIR/sshd_config.before"
+  else
+    latest="$(ls -1t "$BACKUP_DIR/sshd_config."*.bak 2>/dev/null | head -n1 || true)"
+  fi
+
+  if [[ -n "${latest:-}" && -f "${latest:-}" ]]; then
+    cp -p "$latest" /etc/ssh/sshd_config
+    sshd -t || die "Restored sshd_config still invalid."
+    restart_ssh_service
+    log_info "Restored sshd_config from $latest"
+  else
+    log_warn "No sshd_config backup found in $BACKUP_DIR"
+  fi
+
+  log_info "Emergency restore complete. Confirm access via console + SSH."
+}
+main "$@"
--- a/hetzner-bootstrap/scripts/rollback/undo_wireguard.sh
+++ b/hetzner-bootstrap/scripts/rollback/undo_wireguard.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
+source "$SKILL_ROOT/scripts/_common.sh"
+
+main() {
+  require_root
+  confirm_gate
+  log_warn "Stopping and disabling WireGuard wg0"
+  systemctl disable --now wg-quick@wg0 >/dev/null 2>&1 || true
+  log_info "WireGuard disabled. Config remains at /etc/wireguard/wg0.conf (remove manually if desired)."
+}
+main "$@"