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>

node-hardening/scripts/30_fail2ban_setup.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_NAME="$(basename "$0")"
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SKILL_ROOT="$(dirname "$SCRIPT_DIR")"
+
+: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"
+: "${BACKUP_DIR:=$OUTPUT_DIR/backups}"
+: "${TEMPLATE_DIR:=$SKILL_ROOT/templates}"
+
+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; }
+
+ensure_fail2ban() {
+  if command -v fail2ban-client &>/dev/null; then
+    return 0
+  fi
+  log_warn "fail2ban not found; attempting install (Debian/Ubuntu)"
+  if command -v apt-get &>/dev/null; then
+    sudo apt-get update -y
+    sudo apt-get install -y fail2ban
+  else
+    die "fail2ban not installed and apt-get not available. Install manually."
+  fi
+}
+
+render_jail() {
+  local port="$1"
+  sed "s/{{SSH_PORT}}/$port/g" "$TEMPLATE_DIR/fail2ban_jail.tpl"
+}
+
+main() {
+  mkdir -p "$OUTPUT_DIR" "$BACKUP_DIR"
+
+  local enabled="${FAIL2BAN_ENABLE:-true}"
+  if [[ "$enabled" != "true" && "$enabled" != "1" ]]; then
+    log_info "FAIL2BAN_ENABLE disabled; skipping"
+    exit 0
+  fi
+
+  local dry="${DRY_RUN:-1}"
+  [[ "$dry" == "0" ]] || die "Refusing to apply with DRY_RUN=$dry. Export DRY_RUN=0 to proceed."
+
+  ensure_fail2ban
+
+  local ssh_port="${SSH_PORT:-22}"
+
+  if [[ -f /etc/fail2ban/jail.local ]]; then
+    sudo cp -a /etc/fail2ban/jail.local "$BACKUP_DIR/jail.local.before"
+  fi
+
+  log_info "Writing /etc/fail2ban/jail.local"
+  render_jail "$ssh_port" | sudo tee /etc/fail2ban/jail.local >/dev/null
+
+  log_info "Enabling and restarting fail2ban"
+  sudo systemctl enable fail2ban
+  sudo systemctl restart fail2ban
+
+  log_info "fail2ban setup complete"
+}
+
+[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"