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Descriptionrablanco@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
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