datadunia
359 lines
10 KiB
Bash
359 lines
10 KiB
Bash
#!/bin/bash
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# wg-policy-lib.sh — Shared functions for WireGuard Policy Firewall
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# Source this file; do not execute directly.
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set -euo pipefail
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# ============================================================
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# CONFIGURATION
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# ============================================================
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readonly WG_IF="${WG_IF:-wg0}"
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readonly CHAIN="WG_POLICY"
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readonly CHAIN_BACKUP="WG_POLICY_BAK"
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readonly POLICY_FILE="/etc/wireguard/policy.json"
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readonly WG_CONF="/etc/wireguard/wg0.conf"
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readonly LOCK_FILE="/var/lock/wg-policy.lock"
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readonly BACKUP_DIR="/etc/wireguard/backups"
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readonly LOG_PREFIX="WG_DROP"
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readonly LOG_RATE="10/min"
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readonly IPSET_V4="wg_allowed_v4"
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readonly IPSET_V6="wg_allowed_v6"
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readonly MAX_RETRY=3
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readonly RETRY_DELAY=2
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readonly DEBOUNCE_SEC=2
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# ============================================================
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# LOGGING
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# ============================================================
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log_info() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] [INFO] $*"; }
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log_warn() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] [WARN] $*" >&2; }
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log_error() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] [ERROR] $*" >&2; }
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# ============================================================
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# VALIDATION
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# ============================================================
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# Validate IPv4 address (strict: 0-255 per octet, no leading zeros)
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validate_ipv4() {
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local ip="$1"
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# Match basic pattern
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if [[ ! "$ip" =~ ^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$ ]]; then
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return 1
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fi
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local IFS='.'
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read -ra octets <<< "$ip"
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for octet in "${octets[@]}"; do
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# Reject leading zeros (except "0" itself)
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if [[ "$octet" =~ ^0[0-9] ]]; then
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return 1
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fi
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if (( octet < 0 || octet > 255 )); then
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return 1
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fi
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done
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return 0
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}
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# Validate IPv4 CIDR (e.g., 192.168.1.0/24)
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validate_ipv4_cidr() {
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local cidr="$1"
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local ip prefix
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if [[ "$cidr" == *"/"* ]]; then
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ip="${cidr%%/*}"
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prefix="${cidr##*/}"
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else
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# Single IP treated as /32
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ip="$cidr"
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prefix="32"
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fi
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if ! validate_ipv4 "$ip"; then
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return 1
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fi
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if [[ ! "$prefix" =~ ^[0-9]+$ ]] || (( prefix < 0 || prefix > 32 )); then
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return 1
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fi
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return 0
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}
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# Validate IPv6 address (basic check)
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validate_ipv6() {
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local ip="$1"
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# Basic IPv6 pattern — covers full, compressed, and mixed notation
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if [[ "$ip" =~ ^([0-9a-fA-F]{0,4}:){2,7}[0-9a-fA-F]{0,4}$ ]] || \
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[[ "$ip" =~ ^::([0-9a-fA-F]{0,4}:){0,5}[0-9a-fA-F]{0,4}$ ]] || \
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[[ "$ip" =~ ^([0-9a-fA-F]{0,4}:){1,7}:$ ]] || \
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[[ "$ip" == "::" ]] || \
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[[ "$ip" == "::1" ]]; then
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return 0
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fi
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return 1
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}
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# Validate IPv6 CIDR
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validate_ipv6_cidr() {
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local cidr="$1"
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local ip prefix
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if [[ "$cidr" == *"/"* ]]; then
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ip="${cidr%%/*}"
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prefix="${cidr##*/}"
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else
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ip="$cidr"
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prefix="128"
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fi
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if ! validate_ipv6 "$ip"; then
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return 1
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fi
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if [[ ! "$prefix" =~ ^[0-9]+$ ]] || (( prefix < 0 || prefix > 128 )); then
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return 1
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fi
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return 0
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}
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# Generic CIDR validator — dispatches to v4 or v6
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validate_cidr() {
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local cidr="$1"
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if [[ "$cidr" == *":"* ]]; then
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validate_ipv6_cidr "$cidr"
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else
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validate_ipv4_cidr "$cidr"
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fi
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}
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# ============================================================
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# IPSET MANAGEMENT
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# ============================================================
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has_ipset() {
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command -v ipset &>/dev/null
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}
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ensure_ipset() {
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local name="$1" family="$2"
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has_ipset || return 0
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if ! ipset list "$name" &>/dev/null; then
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ipset create "$name" hash:net family "$family" hashsize 1024 maxelem 65536 timeout 0
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log_info "Created ipset: $name (family=$family)"
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fi
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}
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flush_ipset() {
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local name="$1"
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has_ipset || return 0
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if ipset list "$name" &>/dev/null; then
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ipset flush "$name"
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fi
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}
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destroy_ipset() {
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local name="$1"
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has_ipset || return 0
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if ipset list "$name" &>/dev/null; then
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ipset destroy "$name"
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fi
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}
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# ============================================================
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# RETRY MECHANISM
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# ============================================================
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retry() {
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local max_attempts="${MAX_RETRY}"
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local delay="${RETRY_DELAY}"
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local attempt=1
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local exit_code=0
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while (( attempt <= max_attempts )); do
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if "$@"; then
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return 0
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fi
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exit_code=$?
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log_warn "Attempt $attempt/$max_attempts failed (exit=$exit_code), retrying in ${delay}s..."
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sleep "$delay"
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(( attempt++ ))
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(( delay *= 2 )) # exponential backoff
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done
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log_error "All $max_attempts attempts failed for: $*"
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return "$exit_code"
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}
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# ============================================================
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# LOCK MANAGEMENT
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# ============================================================
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acquire_lock() {
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local lock_fd=200
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eval "exec ${lock_fd}>\"${LOCK_FILE}\""
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if ! flock -x -w 10 "$lock_fd"; then
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log_error "Failed to acquire lock: ${LOCK_FILE} (timeout 10s)"
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return 1
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fi
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log_info "Lock acquired: ${LOCK_FILE}"
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}
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release_lock() {
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# Lock released automatically when fd closes, but we clean up file
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rm -f "$LOCK_FILE" 2>/dev/null || true
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}
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# ============================================================
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# BACKUP
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# ============================================================
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backup_policy() {
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mkdir -p "$BACKUP_DIR"
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local timestamp
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timestamp="$(date '+%Y%m%d_%H%M%S')"
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if [[ -f "$POLICY_FILE" ]]; then
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cp "$POLICY_FILE" "${BACKUP_DIR}/policy_${timestamp}.json"
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log_info "Backup created: ${BACKUP_DIR}/policy_${timestamp}.json"
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fi
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# Keep only last 50 backups
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local count
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count=$(find "$BACKUP_DIR" -name 'policy_*.json' -type f | wc -l)
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if (( count > 50 )); then
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find "$BACKUP_DIR" -name 'policy_*.json' -type f -printf '%T@ %p\n' \
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| sort -n \
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| head -n $(( count - 50 )) \
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| awk '{print $2}' \
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| xargs rm -f
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log_info "Pruned old backups (kept 50)"
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fi
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}
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backup_iptables() {
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mkdir -p "$BACKUP_DIR"
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local timestamp
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timestamp="$(date '+%Y%m%d_%H%M%S')"
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if iptables-save > "${BACKUP_DIR}/iptables_${timestamp}.rules" 2>/dev/null; then
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log_info "iptables backup: ${BACKUP_DIR}/iptables_${timestamp}.rules"
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fi
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if command -v ip6tables-save &>/dev/null; then
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ip6tables-save > "${BACKUP_DIR}/ip6tables_${timestamp}.rules" 2>/dev/null || true
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fi
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# Keep only last 20 iptables backups
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for prefix in iptables ip6tables; do
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local count
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count=$(find "$BACKUP_DIR" -name "${prefix}_*.rules" -type f | wc -l)
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if (( count > 20 )); then
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find "$BACKUP_DIR" -name "${prefix}_*.rules" -type f -printf '%T@ %p\n' \
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| sort -n \
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| head -n $(( count - 20 )) \
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| awk '{print $2}' \
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| xargs rm -f
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fi
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done
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}
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# ============================================================
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# DETECTION HELPERS
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# ============================================================
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detect_lan_subnets() {
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ip -o -4 route show scope link \
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| awk '{print $1}' \
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| grep -E '^(10\.|172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.)' \
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| sort -u
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}
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detect_wg_subnet() {
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local family="${1:-inet}"
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if [[ "$family" == "inet6" ]]; then
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ip -o -6 addr show "$WG_IF" 2>/dev/null \
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| awk '{print $4; exit}'
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else
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ip -o -4 addr show "$WG_IF" 2>/dev/null \
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| awk '{print $4; exit}'
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fi
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}
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# ============================================================
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# HEALTH CHECK
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# ============================================================
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health_check() {
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local status=0
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local report=""
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# 1. Check interface exists
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if ip link show "$WG_IF" &>/dev/null; then
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report+="[OK] Interface $WG_IF is UP\n"
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else
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report+="[FAIL] Interface $WG_IF not found\n"
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status=1
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fi
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# 2. Check policy.json exists and is valid
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if [[ -f "$POLICY_FILE" ]] && jq empty "$POLICY_FILE" 2>/dev/null; then
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local client_count
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client_count=$(jq '(.clients // {}) | length' "$POLICY_FILE")
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report+="[OK] policy.json valid ($client_count clients)\n"
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else
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report+="[FAIL] policy.json missing or corrupt\n"
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status=1
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fi
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# 3. Check chain exists
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if iptables -L "$CHAIN" -n &>/dev/null; then
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local rule_count
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rule_count=$(iptables -L "$CHAIN" -n 2>/dev/null | tail -n +3 | wc -l)
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report+="[OK] Chain $CHAIN active ($rule_count rules)\n"
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else
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report+="[WARN] Chain $CHAIN not found\n"
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status=1
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fi
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# 4. Check FORWARD reference
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if iptables -L FORWARD -n 2>/dev/null | grep -q "$CHAIN"; then
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report+="[OK] FORWARD chain references $CHAIN\n"
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else
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report+="[WARN] FORWARD chain has no reference to $CHAIN\n"
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status=1
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fi
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# 5. Check ipset
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for set_name in "$IPSET_V4" "$IPSET_V6"; do
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if ipset list "$set_name" &>/dev/null; then
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local entry_count
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entry_count=$(ipset list "$set_name" 2>/dev/null | grep -c '^[0-9a-f:]' || echo 0)
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report+="[OK] ipset $set_name active ($entry_count entries)\n"
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else
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report+="[INFO] ipset $set_name not created (may not be needed)\n"
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fi
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done
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# 6. Check watcher service
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if systemctl is-active --quiet wg-policy.service 2>/dev/null; then
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report+="[OK] wg-policy.service is running\n"
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else
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report+="[INFO] wg-policy.service not running\n"
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fi
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# 7. Check lock file not stale
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if [[ -f "$LOCK_FILE" ]]; then
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local lock_age
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lock_age=$(( $(date +%s) - $(stat -c %Y "$LOCK_FILE" 2>/dev/null || echo 0) ))
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if (( lock_age > 300 )); then
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report+="[WARN] Stale lock file (${lock_age}s old)\n"
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else
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report+="[OK] Lock file age: ${lock_age}s\n"
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fi
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else
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report+="[OK] No stale lock file\n"
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fi
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echo -e "$report"
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return $status
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}
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