[CentOS-docs] Contrib Request, SSH FirewallD

Casey Doyle

cdoyle at timelesslyprecise.com
Mon Oct 30 03:06:34 UTC 2017


Hello,

I would like permission to contribute information to the wiki...

Username: CaseyDoyle

To append an additional method for ssh blocking with firewallD:

Page:
https://wiki.centos.org/HowTos/Network/SecuringSSH#head-3579222198adaf43a3ecbdc438ebce74da40d8ec

Suggest to add the following info to it pertinent section:

------
6. Filter SSH at the Firewall

complementary to iptables method, there is firewall-cmd for newer systems
using FirewallD:

firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT_direct 0 -p
tcp --dport 22 -m state --state NEW -m recent --set
firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT_direct 1 -p
tcp --dport 22 -m state --state NEW -m recent --update --seconds 30
--hitcount 4 -j REJECT --reject-with tcp-reset
firewall-cmd --reload
------

Please advise.
Kind Regards,
-- 
Casey Doyle
617-903-8254
Cdoyle at TimelesslyPrecise.com
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