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/21_ssh_apply.sh

@@ -0,0 +1,92 @@
+#!/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; }
+
+require_confirm() {
+  local require="${REQUIRE_CONFIRM:-1}"
+  local phrase="${CONFIRM_PHRASE:-I UNDERSTAND THIS CAN LOCK ME OUT}"
+  if [[ "$require" != "1" ]]; then
+    return 0
+  fi
+  echo
+  echo "CONFIRMATION REQUIRED"
+  echo "Type the phrase exactly to continue:"
+  echo "  $phrase"
+  read -r input
+  [[ "$input" == "$phrase" ]] || die "Confirmation phrase mismatch; aborting."
+}
+
+render_template() {
+  local port="$1"
+  sed "s/{{SSH_PORT}}/$port/g" "$TEMPLATE_DIR/sshd_config.tpl"
+}
+
+sshd_binary() {
+  if command -v sshd &>/dev/null; then
+    echo "sshd"
+  elif [[ -x /usr/sbin/sshd ]]; then
+    echo "/usr/sbin/sshd"
+  else
+    echo ""
+  fi
+}
+
+reload_service() {
+  if systemctl list-units --type=service | grep -qE '^sshd\.service'; then
+    sudo systemctl reload sshd
+  elif systemctl list-units --type=service | grep -qE '^ssh\.service'; then
+    sudo systemctl reload ssh
+  else
+    die "Could not find ssh/sshd service under systemctl"
+  fi
+}
+
+main() {
+  mkdir -p "$OUTPUT_DIR" "$BACKUP_DIR"
+
+  local dry="${DRY_RUN:-1}"
+  [[ "$dry" == "0" ]] || die "Refusing to apply with DRY_RUN=$dry. Export DRY_RUN=0 to proceed."
+
+  require_confirm
+
+  local ssh_port="${SSH_PORT:-22}"
+  local sshd
+  sshd="$(sshd_binary)"
+  [[ -n "$sshd" ]] || die "sshd binary not found"
+
+  [[ -f /etc/ssh/sshd_config ]] || die "/etc/ssh/sshd_config not found"
+
+  log_info "Backing up current sshd_config"
+  sudo cp -a /etc/ssh/sshd_config "$BACKUP_DIR/sshd_config.before"
+
+  log_info "Writing new sshd_config from template"
+  render_template "$ssh_port" | sudo tee /etc/ssh/sshd_config >/dev/null
+
+  log_info "Validating sshd config (sshd -t)"
+  sudo "$sshd" -t || {
+    log_error "sshd config validation failed; restoring backup"
+    sudo cp -a "$BACKUP_DIR/sshd_config.before" /etc/ssh/sshd_config
+    die "Aborted due to invalid sshd_config"
+  }
+
+  log_info "Reloading SSH service"
+  reload_service
+
+  log_info "SSH hardening applied. Verify you still have access before closing sessions."
+  log_info "If you are locked out, use scripts/rollback/emergency_restore.sh from console."
+}
+
+[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"