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https://github.com/Divested-Mobile/DivestOS-Build.git
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60 lines
4.2 KiB
Diff
60 lines
4.2 KiB
Diff
From c028b9979836c64764bebde8c330680952d0ece4 Mon Sep 17 00:00:00 2001
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From: Tad <tad@spotco.us>
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Date: Wed, 28 Jun 2017 12:30:56 -0400
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Subject: [PATCH] Harden network via iptables
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Change-Id: I42392ed3dcd7d2f42c312bb36f65ccb12914d13b
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---
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server/CommandListener.cpp | 35 +++++++++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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diff --git a/server/CommandListener.cpp b/server/CommandListener.cpp
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index b16da18..2fcc696 100755
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--- a/server/CommandListener.cpp
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+++ b/server/CommandListener.cpp
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@@ -230,6 +230,41 @@ CommandListener::CommandListener() :
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createChildChains(V4, "nat", "PREROUTING", NAT_PREROUTING);
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createChildChains(V4, "nat", "POSTROUTING", NAT_POSTROUTING);
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+
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+ //Drop invalid packets
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+ execIptables(V4V6, "-w", "-I", "INPUT", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-I", "OUTPUT", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
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+ //execIptables(V4V6, "-w", "-I", "FORWARD", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
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+ //Credit: https://javapipe.com/iptables46-ddos-protection
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+ //Drop TCP packets that are new and are not SYN
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "!", "--syn", "-m", "conntrack", "--ctstate", "NEW", "-j", "DROP", NULL);
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+ //Drop SYN packets with suspicious MSS value
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+ execIptables(V4, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "-m", "conntrack", "--ctstate", "NEW", "-m", "tcpmss", "!", "--mss", "536:65535", "-j", "DROP", NULL);
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+ execIptables(V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "-m", "conntrack", "--ctstate", "NEW", "-m", "tcpmss", "!", "--mss", "1220:65535", "-j", "DROP", NULL);
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+ //Drop packets with bogus TCP flags
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "FIN,SYN,RST,PSH,ACK,URG", "NONE", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "FIN,SYN", "FIN,SYN", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "SYN,RST", "SYN,RST", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "SYN,FIN", "SYN,FIN", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "FIN,RST", "FIN,RST", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "FIN,ACK", "FIN", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ACK,URG", "URG", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ACK,FIN", "FIN", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ACK,PSH", "PSH", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ALL", "ALL", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ALL", "NONE", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ALL", "FIN,PSH,URG", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ALL", "SYN,FIN,PSH,URG", "-j", "DROP", NULL);
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+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "--tcp-flags", "ALL", "SYN,RST,ACK,FIN,URG", "-j", "DROP", NULL);
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+ //Drop spoofed packets
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+ execIptables(V4, "-w", "-t", "raw", "-A", "PREROUTING", "-s", "0.0.0.0/8", "-j", "DROP", NULL);
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+ execIptables(V4, "-w", "-t", "raw", "-A", "PREROUTING", "-s", "127.0.0.0/8", "!", "-i", "lo", "-j", "DROP", NULL);
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+ //Drop fragments
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+ execIptables(V4, "-w", "-t", "raw", "-A", "PREROUTING", "-f", "-j", "DROP", NULL);
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+ //Limit connections per source IP
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+ execIptables(V4V6, "-w", "-A", "INPUT", "-p", "tcp", "-m", "connlimit", "--connlimit-above", "32", "!", "-i", "lo", "-j", "REJECT", NULL);
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+
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+
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// Let each module setup their child chains
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setupOemIptablesHook();
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--
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2.14.1
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