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More intelligence in iptables rulesets. Account for Policy ACCEPT, with

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default rule DROP or REJECT as last rule.

Regex the conditions to make sure we are getting the right conditions.

Reframe the logic to simplify the chains and rules

Reframe the logic to simplify the chains and rules

Signed-off-by: Dan Schaper <dan.schaper@pi-hole.net>
This commit is contained in:
Dan Schaper 2016-12-31 19:07:40 -08:00
parent 1f9b0f7cef
commit ccbf391913
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GPG key ID: 572E999E385B7BFC
2 changed files with 15 additions and 6 deletions
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3
.idea/codeStyleSettings.xml
View file

@ -15,6 +15,9 @@
<option name="USE_RELATIVE_INDENTS" value="false" />
</value>
</option>
<MarkdownNavigatorCodeStyleSettings>
<option name="RIGHT_MARGIN" value="72" />
</MarkdownNavigatorCodeStyleSettings>
</value>
</option>
<option name="USE_PER_PROJECT_SETTINGS" value="true" />

16
automated install/basic-install.sh
View file

@ -870,11 +870,17 @@ configureFirewall() {
echo "::: Configuring FirewallD for httpd and dnsmasq.."
firewall-cmd --permanent --add-port=80/tcp --add-port=53/tcp --add-port=53/udp
firewall-cmd --reload
elif modinfo ip_tables &> /dev/null && iptables -S INPUT | head -n1 | grep -v "ACCEPT" &> /dev/null ; then
echo "::: Configuring iptables for httpd and dnsmasq.."
iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 53 -j ACCEPT
iptables -A INPUT -p udp -m udp --dport 53 -j ACCEPT
# Check for proper kernel modules to prevent failure
elif modinfo ip_tables &> /dev/null; then
# If chain Policy is not ACCEPT or last Rule is not ACCEPT
# then check and insert our Rules above the DROP/REJECT Rule.
if iptables -S INPUT | head -n1 | grep -qv 'ACCEPT$' || iptables -S INPUT | tail -n1 | grep -qv '^-A.*ACCEPT$'; then
# Check chain first, otherwise a new rule will duplicate old ones
echo "::: Configuring iptables for httpd and dnsmasq.."
iptables -C INPUT -p tcp -m tcp --dport 80 -j ACCEPT &> /dev/null || iptables -I INPUT 1 -p tcp -m tcp --dport 80 -j ACCEPT
iptables -C INPUT -p tcp -m tcp --dport 53 -j ACCEPT &> /dev/null || iptables -I INPUT 1 -p tcp -m tcp --dport 53 -j ACCEPT
iptables -C INPUT -p udp -m udp --dport 53 -j ACCEPT &> /dev/null || iptables -I INPUT 1 -p udp -m udp --dport 53 -j ACCEPT
fi
else
echo "::: No active firewall detected.. skipping firewall configuration."
fi