asepharyana
e6033c8b12
- deny-by-default iptables/ip6tables: public cuma 22/80/443/4013, sisanya localhost + tailscale CGNAT; log FW-DROP rate-limited - persist via netfilter-persistent (rules.v4/v6) + /usr/local/bin/firewall.sh - sysctl hardening: syncookies, rp_filter, redirect off, kptr/dmesg restrict, protected links, somaxconn, tcp retries tuner - sshd: PasswordAuthentication no (fix 50-cloud-init.conf override), PermitRootLogin prohibit-password, MaxAuthTries 4, LoginGraceTime 30, X11Forwarding no
75 lines
2.5 KiB
Bash
Executable File
75 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# ============================================================
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# firewall.sh — deny-by-default firewall untuk orangevps
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# Public: 22 (SSH), 80/443 (Caddy), 4013 (hermes dashboard)
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# Tailscale CGNAT 100.64/10: semua port (imrnes & node lain)
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# Localhost: semua
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# Sisanya: DROP + log
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# ============================================================
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set -e
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### IPv4 ###
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iptables -F
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iptables -X
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iptables -Z
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# Policy default DROP
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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iptables -P OUTPUT ACCEPT
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# Loopback
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iptables -A INPUT -i lo -j ACCEPT
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# Established/related
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iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# Tailscale overlay (100.64.0.0/10) — imrnes & peers
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iptables -A INPUT -s 100.64.0.0/10 -j ACCEPT
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# Public: SSH, HTTP(S)
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iptables -A INPUT -p tcp --dport 22 -j ACCEPT
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iptables -A INPUT -p tcp --dport 80 -j ACCEPT
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iptables -A INPUT -p tcp --dport 443 -j ACCEPT
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# Public: hermes dashboard (auth-protected)
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iptables -A INPUT -p tcp --dport 4013 -j ACCEPT
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# ICMP (ping, PMTU)
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iptables -A INPUT -p icmp --icmp-type echo-request -m limit --limit 5/sec --limit-burst 10 -j ACCEPT
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iptables -A INPUT -p icmp -m conntrack --ctstate NEW -j ACCEPT
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iptables -A INPUT -p icmp -j ACCEPT
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# Log dropped (rate-limited, 1 baris/5s)
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iptables -A INPUT -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "FW-DROP " --log-level 4
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iptables -A INPUT -j DROP
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# UFW chains (dipanggil dari ts-input) — kosongkan
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iptables -F ufw-before-input 2>/dev/null || true
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iptables -F ufw-after-input 2>/dev/null || true
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iptables -F ufw-before-logging-input 2>/dev/null || true
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iptables -F ufw-after-logging-input 2>/dev/null || true
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iptables -F ufw-reject-input 2>/dev/null || true
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iptables -F ufw-track-input 2>/dev/null || true
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### IPv6 ###
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ip6tables -F
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ip6tables -X
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ip6tables -Z
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ip6tables -P INPUT DROP
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ip6tables -P FORWARD DROP
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ip6tables -P OUTPUT ACCEPT
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ip6tables -A INPUT -i lo -j ACCEPT
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ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# Tailscale IPv6 ULA (fd7a:115c::/48)
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ip6tables -A INPUT -s fd7a:115c::/48 -j ACCEPT
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ip6tables -A INPUT -p tcp --dport 22 -j ACCEPT
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ip6tables -A INPUT -p tcp --dport 80 -j ACCEPT
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ip6tables -A INPUT -p tcp --dport 443 -j ACCEPT
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ip6tables -A INPUT -p tcp --dport 4013 -j ACCEPT
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ip6tables -A INPUT -p icmpv6 -j ACCEPT
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ip6tables -A INPUT -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "FW6-DROP " --log-level 4
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ip6tables -A INPUT -j DROP
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echo "Firewall applied:"
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iptables -L INPUT -n --line-numbers | head -20
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