Bug 2156831

Summary: Allow RHEL8 firewalld 0.9.3 to accept established and related connections with reject/drop policies
Product: Red Hat Enterprise Linux 8 Reporter: rablanco <rablanco>
Component: firewalldAssignee: Eric Garver <egarver>
Status: CLOSED MIGRATED QA Contact: Tomas Dolezal <todoleza>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 8.7CC: dereks, mcolombo, todoleza
Target Milestone: rcKeywords: MigratedToJIRA, TestCaseProvided, Triaged, Upstream, ZStream
Target Release: ---Flags: egarver: mirror-
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of:
: 2196599 (view as bug list) Environment:
Last Closed: 2023-05-19 17:10:16 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2183216, 2196599    

Description rablanco@redhat.com 2022-12-28 23:02:28 UTC 
Description of problem:

Allow RHEL8 firewalld 0.9.3 to accept established and related connections with reject/drop policies

Version-Release number of selected component (if applicable):

firewalld 0.9.3 

How reproducible:

1) You need to apply the following policy

firewall-cmd --new-policy out --permanent
firewall-cmd --set-target REJECT --policy out --permanent
firewall-cmd --policy out --add-egress-zone ANY --permanent
firewall-cmd --policy out --add-ingress-zone HOST --permanent


2) then try to connect from a other machine via ssh , it should be blocked 



The case notes shows that the following line is missed on Redhat 8


chain filter_OUTPUT {
		type filter hook output priority filter + 10; policy accept;
		ct state { established, related } accept <<-------------------- this is missing in RHEL 8.0!!!!!!!
		oifname "lo" accept
		ip6 daddr { ::/96, ::ffff:0.0.0.0/96, 2002::/24, 2002:a00::/24, 2002:7f00::/24, 2002:a9fe::/32, 2002:ac10::/28, 2002:c0a8::/32, 2002:e000::/19 } reject with icmpv6 type addr-unreachable
		jump filter_OUTPUT_POLICIES_pre
		jump filter_OUTPUT_POLICIES_post
	}



3) After inserting the line manually, the problem is fix but we need to modify the firewalld code in order to place the rule from the begining


Temporary fix 
# nft insert rule inet firewalld filter_OUTPUT 'ct state { established, related } accept'


Actual results:


The server is blocked after applying the policy


Expected results:


- All outgoing traffic should be blocked expect for the already established connections


Additional info:


We found the solution here

https://github.com/firewalld/firewalld/pull/709/commits/4581f83ea51d55ec7929d8a81ff485918a10e34e 


On the case I left a note about the changes on the py scripts in order to fix the issue 


case : 03398728
Comment 6 Eric Garver 2023-07-27 13:43:12 UTC 
*** Bug 2226887 has been marked as a duplicate of this bug. ***