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Add bash and ansible remediation for set_loopback_traffic #9939

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merged 4 commits into from
Dec 7, 2022
Merged

Add bash and ansible remediation for set_loopback_traffic #9939

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b75e585
ansible remed for set_loopback_traffic
Dec 6, 2022
f6a6fb3
bash remed for set_loopback_traffic
Dec 6, 2022
2e8307b
add newline to ansible remed for loopback_traffic
Dec 7, 2022
5e98367
really add newline to bash set_loopback_traffic
Dec 7, 2022
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19 changes: 19 additions & 0 deletions ...stem/network/network-iptables/iptables_activation/set_loopback_traffic/ansible/shared.yml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
# platform = multi_platform_sle

- name: Allow incoming traffic on the loopback interface
ansible.builtin.iptables:
chain: INPUT
in_interface: lo
jump: ACCEPT

- name: Allow outgoing traffic on the loopback interface
ansible.builtin.iptables:
chain: OUTPUT
out_interface: lo
jump: ACCEPT

- name: Drop incoming traffic from the localhost
ansible.builtin.iptables:
chain: INPUT
source: "127.0.0.0/8"
jump: DROP
23 changes: 3 additions & 20 deletions ...e/system/network/network-iptables/iptables_activation/set_loopback_traffic/bash/shared.sh
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Original file line number Diff line number Diff line change
@@ -1,22 +1,5 @@
# platform = multi_platform_sle

# Implement the loopback rules:
nft add rule inet filter input iif lo accept
nft create rule inet filter input ip saddr 127.0.0.0/8 counter drop

# Check IPv6 is disabled, if false implement IPv6 loopback rules
[ -n "$passing" ] && passing=""
[ -z "$(grep "^\s*linux" /boot/grub2/grub.cfg | grep -v ipv6.disabled=1)" ] && passing="true"

grep -Eq "^\s*net\.ipv6\.conf\.all\.disable_ipv6\s*=\s*1\b(\s+#.*)?$" \
/etc/sysctl.conf /etc/sysctl.d/*.conf && \
grep -Eq "^\s*net\.ipv6\.conf\.default\.disable_ipv6\s*=\s*1\b(\s+#.*)?$" \
/etc/sysctl.conf /etc/sysctl.d/*.conf && sysctl net.ipv6.conf.all.disable_ipv6 | \
grep -Eq "^\s*net\.ipv6\.conf\.all\.disable_ipv6\s*=\s*1\b(\s+#.*)?$" && \
sysctl net.ipv6.conf.default.disable_ipv6 | \
grep -Eq "^\s*net\.ipv6\.conf\.default\.disable_ipv6\s*=\s*1\b(\s+#.*)?$" && passing="true"

# Is IPv6 Disabled? (true/fasle)
if [ "$passing" = false ] ; then
nft add rule inet filter input ip6 saddr ::1 counter drop
fi
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -s 127.0.0.0/8 -j DROP