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Fix network hardening

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This commit is contained in:
Tad 2017-06-28 09:25:59 -04:00
parent 82be2c12f5
commit 219ee0ae4b
1 changed files with 10 additions and 41 deletions
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51
Patches/LineageOS-14.1/android_system_netd/0001-Harden_Network.patch
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@ -1,30 +1,30 @@
From f705d1c7cae38ca9070f24ff5c076b06ab827244 Mon Sep 17 00:00:00 2001
From b99315589e2ede5e9b7e7f8b091bf720a1ee3fab Mon Sep 17 00:00:00 2001
From: Tad <tad@spotco.us>
Date: Wed, 28 Jun 2017 08:19:00 -0400
Date: Wed, 28 Jun 2017 09:24:54 -0400
Subject: [PATCH] Harden network via iptables
Change-Id: I37eca1211768b9d3aa63fa59a40112e35c5e8c62
Change-Id: Icd1e950a2448435ad234913f896844a820b12dd8
---
server/CommandListener.cpp | 69 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
server/CommandListener.cpp | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/server/CommandListener.cpp b/server/CommandListener.cpp
index b16da18..6aca8aa 100755
index b16da18..71d91af 100755
--- a/server/CommandListener.cpp
+++ b/server/CommandListener.cpp
@@ -230,6 +230,75 @@ CommandListener::CommandListener() :
@@ -230,6 +230,44 @@ CommandListener::CommandListener() :
createChildChains(V4, "nat", "PREROUTING", NAT_PREROUTING);
createChildChains(V4, "nat", "POSTROUTING", NAT_POSTROUTING);
+
+ //Drop incoming, drop routed, and allow outgoing
+ execIptables(V4V6, "-w", "-P", "INPUT", "DROP", NULL);
+ //drop routed, and allow outgoing
+ execIptables(V4V6, "-w", "-P", "FORWARD", "DROP", NULL);
+ execIptables(V4V6, "-w", "-P", "OUTPUT", "ACCEPT", NULL);
+ //Drop invalid packets
+ execIptables(V4V6, "-w", "-A", "INPUT", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
+ execIptables(V4V6, "-w", "-A", "OUTPUT", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
+ execIptables(V4V6, "-w", "-A", "FORWARD", "-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP", NULL);
+ //Credit: https://javapipe.com/iptables46-ddos-protection
+ //Drop TCP packets that are new and are not SYN
+ execIptables(V4V6, "-w", "-t", "raw", "-A", "PREROUTING", "-p", "tcp", "!", "--syn", "-m", "conntrack", "--ctstate", "NEW", "-j", "DROP", NULL);
+ //Drop SYN packets with suspicious MSS value
@ -51,38 +51,7 @@ index b16da18..6aca8aa 100755
+ //Drop fragments
+ execIptables(V4, "-w", "-t", "raw", "-A", "PREROUTING", "-f", "-j", "DROP", NULL);
+ //Limit connections per source IP
+ execIptables(V4V6, "-w", "-A", "INPUT", "-p", "tcp", "-m", "connlimit", "--connlimit-above", "64", "!", "-i", "lo", "-j", "REJECT", NULL);
+ //Allow certain ICMP types
+ execIptables(V4, "-w", "-A", "INPUT", "-p", "icmp", "--icmp-type", "0", "-m", "conntrack", "--ctstate", "NEW", "-j", "ACCEPT", NULL);
+ execIptables(V4, "-w", "-A", "INPUT", "-p", "icmp", "--icmp-type", "3", "-m", "conntrack", "--ctstate", "NEW", "-j", "ACCEPT", NULL);
+ execIptables(V4, "-w", "-A", "INPUT", "-p", "icmp", "--icmp-type", "8", "-m", "conntrack", "--ctstate", "NEW", "-j", "ACCEPT", NULL);
+ execIptables(V4, "-w", "-A", "INPUT", "-p", "icmp", "--icmp-type", "11", "-m", "conntrack", "--ctstate", "NEW", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "1", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "2", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "3", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "4", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "128", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "133", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "134", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "135", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "136", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "137", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "141", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "142", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "130", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "131", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "132", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "143", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "148", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-p", "ipv6-icmp", "--icmpv6-type", "149", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "151", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "152", "-j", "ACCEPT", NULL);
+ execIptables(V6, "-w", "-A", "INPUT", "-s", "fe80::/10", "-p", "ipv6-icmp", "--icmpv6-type", "153", "-j", "ACCEPT", NULL);
+ //Allow related/existing connections
+ execIptables(V4V6, "-w", "-A", "INPUT", "-i", "lo", "-j", "ACCEPT", NULL);
+ execIptables(V4V6, "-w", "-A", "OUTPUT", "-o", "lo", "-j", "ACCEPT", NULL);
+ execIptables(V4V6, "-w", "-A", "INPUT", "-m", "conntrack", "--ctstate", "ESTABLISHED,RELATED", "-j", "ACCEPT", NULL);
+ execIptables(V4V6, "-w", "-A", "OUTPUT", "-m", "conntrack", "--ctstate", "ESTABLISHED,RELATED", "-j", "ACCEPT", NULL);
+ execIptables(V4V6, "-w", "-A", "INPUT", "-p", "tcp", "-m", "connlimit", "--connlimit-above", "32", "!", "-i", "lo", "-j", "REJECT", NULL);
+
+
// Let each module setup their child chains