datadunia
760e0e88fa
- Added install.sh for easy setup and teardown - Added build.sh and build.bat to dynamically assemble install.sh - Updated README.md with new installation instructions - Fixed bidirectional WG_POLICY FORWARD rule routing in wg-policy-engine.sh
326 lines
11 KiB
Bash
326 lines
11 KiB
Bash
#!/bin/bash
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# wg-policy-engine.sh — Applies iptables/ipset rules from policy.json
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# Fixed: unquoted variables, LOG placement, LAN block targeting,
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# atomic chain swap, ipset, IPv6 optional, rollback on failure
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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source "${SCRIPT_DIR}/wg-policy-lib.sh"
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# ============================================================
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# ROLLBACK
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# ============================================================
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rollback() {
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log_error "ROLLBACK triggered! Restoring previous rules..."
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# Remove new chain references
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while true; do
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local rline=""
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rline=$(iptables -nL FORWARD --line-numbers 2>/dev/null | grep "$CHAIN" | awk '{print $1}' | head -n 1 || true)
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if [[ -n "$rline" ]]; then
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iptables -D FORWARD "$rline" 2>/dev/null || break
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else
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break
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fi
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done
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# Flush and remove new chain
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iptables -F "$CHAIN" 2>/dev/null || true
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iptables -X "$CHAIN" 2>/dev/null || true
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# Restore backup chain if it exists
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if iptables -L "$CHAIN_BACKUP" -n &>/dev/null; then
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# Rename backup chain to active
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iptables -N "$CHAIN" 2>/dev/null || iptables -F "$CHAIN"
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# Copy rules from backup
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iptables-save -c | grep "^-A $CHAIN_BACKUP" | \
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sed "s/-A $CHAIN_BACKUP/-A $CHAIN/" | \
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iptables-restore -c 2>/dev/null || true
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iptables -A FORWARD -i "$WG_IF" -j "$CHAIN"
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log_info "Rollback: restored from backup chain"
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fi
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# Cleanup backup chain
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iptables -F "$CHAIN_BACKUP" 2>/dev/null || true
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iptables -X "$CHAIN_BACKUP" 2>/dev/null || true
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# Cleanup backup ipsets
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destroy_ipset "${IPSET_V4}_bak" 2>/dev/null || true
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destroy_ipset "${IPSET_V6}_bak" 2>/dev/null || true
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}
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# ============================================================
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# MAIN
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# ============================================================
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main() {
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log_info "Starting policy engine..."
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# === VALIDATE ===
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if ! ip link show "$WG_IF" &>/dev/null; then
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log_error "Interface $WG_IF is not running. Aborting policy engine."
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exit 1
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fi
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if [[ ! -f "$POLICY_FILE" ]]; then
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log_error "Policy file not found: $POLICY_FILE"
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exit 1
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fi
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if ! jq empty "$POLICY_FILE" 2>/dev/null; then
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log_error "policy.json is corrupt"
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exit 1
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fi
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# Backup iptables state
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backup_iptables
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# Set trap for rollback on failure
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trap 'rollback' ERR
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# === DETECT SUBNETS ===
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local WG_SUBNET WG_SUBNET_V6 LAN_SUBNETS DEF_IF
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WG_SUBNET="$(detect_wg_subnet inet)"
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WG_SUBNET_V6="$(detect_wg_subnet inet6)"
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LAN_SUBNETS="$(detect_lan_subnets)"
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DEF_IF="$(detect_default_if)"
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if [[ -z "$WG_SUBNET" ]]; then
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log_warn "Interface $WG_IF has no IPv4, skipping client isolation"
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else
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log_info "WG IPv4 subnet: $WG_SUBNET"
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fi
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if [[ -n "$WG_SUBNET_V6" ]]; then
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log_info "WG IPv6 subnet: $WG_SUBNET_V6"
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fi
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if [[ -n "$LAN_SUBNETS" ]]; then
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log_info "Detected LAN subnets:"
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echo "$LAN_SUBNETS" | while read -r s; do log_info " $s"; done
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fi
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# === BASE ROUTING & NAT ===
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# Enable IP Forwarding
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sysctl -w net.ipv4.ip_forward=1 >/dev/null 2>&1 || true
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if command -v ip6tables &>/dev/null; then
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sysctl -w net.ipv6.conf.all.forwarding=1 >/dev/null 2>&1 || true
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fi
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# Setup MASQUERADE on default interface
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if ! iptables -t nat -C POSTROUTING -o "$DEF_IF" -j MASQUERADE 2>/dev/null; then
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iptables -t nat -A POSTROUTING -o "$DEF_IF" -j MASQUERADE
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log_info "Enabled IPv4 MASQUERADE on $DEF_IF"
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fi
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# === CLEANUP OLD CHAIN (loop until all references removed) ===
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log_info "Cleaning up old chain references..."
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while true; do
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local rline=""
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rline=$(iptables -nL FORWARD --line-numbers 2>/dev/null | grep "$CHAIN" | awk '{print $1}' | head -n 1 || true)
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if [[ -n "$rline" ]]; then
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iptables -D FORWARD "$rline" 2>/dev/null || break
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else
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break
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fi
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done
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# Backup existing chain before flushing
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if iptables -L "$CHAIN" -n &>/dev/null; then
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iptables -N "$CHAIN_BACKUP" 2>/dev/null || iptables -F "$CHAIN_BACKUP"
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iptables-save -c 2>/dev/null | grep "^-A $CHAIN" | \
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sed "s/-A $CHAIN/-A $CHAIN_BACKUP/" | \
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iptables-restore -c 2>/dev/null || true
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log_info "Backed up existing chain to $CHAIN_BACKUP"
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fi
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iptables -F "$CHAIN" 2>/dev/null || true
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iptables -X "$CHAIN" 2>/dev/null || true
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# === CREATE FRESH CHAIN ===
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iptables -N "$CHAIN"
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if ! iptables -C FORWARD -i "$WG_IF" -j "$CHAIN" 2>/dev/null; then
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iptables -I FORWARD 1 -i "$WG_IF" -j "$CHAIN"
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fi
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if ! iptables -C FORWARD -o "$WG_IF" -j "$CHAIN" 2>/dev/null; then
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iptables -I FORWARD 2 -o "$WG_IF" -j "$CHAIN"
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fi
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log_info "Chain $CHAIN created and linked to FORWARD (In/Out)"
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# === POPULATE IPSET (hash:net,net for source->target mapping) ===
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local use_ipset=false
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if has_ipset; then
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use_ipset=true
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log_info "Populating ipsets..."
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ensure_ipset "$IPSET_V4" "inet"
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flush_ipset "$IPSET_V4"
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# Check if we need IPv6 ipset
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local use_ipv6=false
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if [[ -n "$WG_SUBNET_V6" ]] && command -v ip6tables &>/dev/null; then
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use_ipv6=true
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ensure_ipset "$IPSET_V6" "inet6"
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flush_ipset "$IPSET_V6"
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fi
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# Read all access entries and populate ipset (client_ip,target)
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jq -r '
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.clients // {} | to_entries[] |
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select(.value.access != null and (.value.access | length > 0)) |
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.key as $ip |
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.value.access[] |
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"\($ip) \(.)"
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' "$POLICY_FILE" 2>/dev/null | while read -r client_ip target; do
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[[ -z "$client_ip" || -z "$target" ]] && continue
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if [[ "$target" == *":"* ]]; then
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if [[ "$use_ipv6" == true ]]; then
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ipset add "$IPSET_V6" "${client_ip},${target}" 2>/dev/null || \
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log_warn "Failed to add ${client_ip},${target} to ipset $IPSET_V6"
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fi
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else
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ipset add "$IPSET_V4" "${client_ip},${target}" 2>/dev/null || \
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log_warn "Failed to add ${client_ip},${target} to ipset $IPSET_V4"
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fi
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done
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local v4_count v6_count
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v4_count=$(ipset list "$IPSET_V4" 2>/dev/null | grep -c '^[0-9]' || echo 0)
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v6_count=$(ipset list "$IPSET_V6" 2>/dev/null | grep -c '^[0-9a-f:]' || echo 0)
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log_info "ipset $IPSET_V4: $v4_count entries, $IPSET_V6: $v6_count entries"
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else
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log_warn "ipset not installed, falling back to per-rule iptables whitelist"
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local use_ipv6=false
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if [[ -n "$WG_SUBNET_V6" ]] && command -v ip6tables &>/dev/null; then
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use_ipv6=true
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fi
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fi
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# === RULE 1: ESTABLISHED,RELATED — allow return traffic ===
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iptables -A "$CHAIN" -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# === RULE 2: WHITELIST (per-client source) ===
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if [[ "$use_ipset" == true ]]; then
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iptables -A "$CHAIN" -m set --match-set "$IPSET_V4" src,dst -j ACCEPT
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if [[ "$use_ipv6" == true ]]; then
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ip6tables -A "$CHAIN" -m set --match-set "$IPSET_V6" src,dst -j ACCEPT 2>/dev/null || true
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fi
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else
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jq -r '
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.clients // {} | to_entries[] |
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select(.value.access != null and (.value.access | length > 0)) |
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.key as $ip |
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.value.access[] |
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"\($ip) \(.)"
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' "$POLICY_FILE" 2>/dev/null | while read -r client_ip target; do
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[[ -z "$client_ip" || -z "$target" ]] && continue
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if [[ "$client_ip" == *":"* ]]; then
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if [[ "$use_ipv6" == true ]]; then
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ip6tables -A "$CHAIN" -s "$client_ip" -d "$target" -j ACCEPT 2>/dev/null || true
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fi
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else
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iptables -A "$CHAIN" -s "$client_ip" -d "$target" -j ACCEPT
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fi
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done
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fi
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# === RULE 3: ISOLATION — drop NEW connections between WG clients ===
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if [[ -n "$WG_SUBNET" ]]; then
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iptables -A "$CHAIN" \
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-s "$WG_SUBNET" \
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-d "$WG_SUBNET" \
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-m conntrack --ctstate NEW \
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-j DROP
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log_info "Client isolation enabled for $WG_SUBNET"
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fi
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if [[ "$use_ipv6" == true && -n "$WG_SUBNET_V6" ]]; then
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ip6tables -A "$CHAIN" \
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-s "$WG_SUBNET_V6" \
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-d "$WG_SUBNET_V6" \
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-m conntrack --ctstate NEW \
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-j DROP 2>/dev/null || true
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log_info "Client isolation enabled for IPv6 $WG_SUBNET_V6"
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fi
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# === RULE 4: BLOCK LAN — drop from WG subnet to private LAN ===
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if [[ -n "$WG_SUBNET" && -n "$LAN_SUBNETS" ]]; then
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echo "$LAN_SUBNETS" | while read -r subnet; do
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[[ -z "$subnet" ]] && continue
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# Skip if LAN subnet exactly matches WG subnet (handled by Rule 3)
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[[ "$subnet" == "$WG_SUBNET" ]] && continue
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iptables -A "$CHAIN" -s "$WG_SUBNET" -d "$subnet" -j DROP
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log_info "Block: $WG_SUBNET → $subnet"
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done
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fi
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# IPv6 LAN block (link-local and ULA)
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if [[ "$use_ipv6" == true && -n "$WG_SUBNET_V6" ]]; then
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# Block to link-local (fe80::/10)
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ip6tables -A "$CHAIN" -s "$WG_SUBNET_V6" -d "fe80::/10" -j DROP 2>/dev/null || true
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# Block to ULA (fc00::/7)
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ip6tables -A "$CHAIN" -s "$WG_SUBNET_V6" -d "fc00::/7" -j DROP 2>/dev/null || true
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log_info "IPv6 LAN block applied (link-local + ULA)"
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fi
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# === RULE 5: INTERNET ACCESS (#Internet = true) ===
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jq -r '
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.clients // {} | to_entries[] |
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select(.value.internet == "true") |
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"\(.key)"
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' "$POLICY_FILE" 2>/dev/null | while read -r client_ip; do
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[[ -z "$client_ip" ]] && continue
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if [[ "$client_ip" == *":"* ]]; then
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if [[ "$use_ipv6" == true ]]; then
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ip6tables -A "$CHAIN" -s "$client_ip" -j ACCEPT 2>/dev/null || true
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fi
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else
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iptables -A "$CHAIN" -s "$client_ip" -j ACCEPT
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fi
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done
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# === RULE 6: LOGGING (rate-limited) — BEFORE final DROP ===
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iptables -A "$CHAIN" \
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-m limit --limit "$LOG_RATE" \
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-j LOG --log-prefix "${LOG_PREFIX}: " --log-level 4
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if [[ "$use_ipv6" == true ]]; then
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ip6tables -A "$CHAIN" \
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-m limit --limit "$LOG_RATE" \
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-j LOG --log-prefix "${LOG_PREFIX}: " --log-level 4 2>/dev/null || true
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fi
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# === RULE 7: DEFAULT DROP (internet block by default) ===
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iptables -A "$CHAIN" -j DROP
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if [[ "$use_ipv6" == true ]]; then
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ip6tables -A "$CHAIN" -j DROP 2>/dev/null || true
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fi
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# === CLEANUP BACKUP CHAIN (no rollback needed anymore) ===
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iptables -F "$CHAIN_BACKUP" 2>/dev/null || true
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iptables -X "$CHAIN_BACKUP" 2>/dev/null || true
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# Disable ERR trap (success path)
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trap - ERR
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# === VERIFY ===
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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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log_info "Policy applied. Chain: $CHAIN, Rules: $rule_count"
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echo "[OK] iptables policy applied. Chain: $CHAIN"
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}
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main "$@"
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