firewalld-users September 2020

firewalld-users@lists.fedorahosted.org

9 participants
15 discussions

Firewalld rules for protecting a web server.
by Jason Long 13 Oct '20

13 Oct '20

Hello, I need the experts advice about the best Firewalld configuration for a web server. In Firewalld, I just opened port 80,443 and 22, but I'm sure with Firewalld I can protect my server with other useful rules. Can anyone share some good rules? For example, limitation or... Thank you.

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Firewalld and Hping3.
by Jason Long 13 Oct '20

13 Oct '20

Hello, How can I this attack from hping3 by Firewalld: # hping3 -S -p 22 --flood --rand-source "IP" Is it possible? Thank you.

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Using firewalld to redirect IP to domain name.
by Jason Long 28 Sep '20

28 Sep '20

Hello, Is it possible to redirect http incoming request for an IP address to a domain name? For example, if someone entered "1.2.3.4" IP in his\her browser then it redirect to "example.net". Can Firewalld do these kind of tasks? Thank you.

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forwarding rules
by D. Hugh Redelmeier 25 Sep '20

25 Sep '20

I think I need to add a rich rule for forwarding. Or write a nftable rule to do the same thing. Is there a reasonable way to get firewalld-0.9 for Fedora 32? I don't wish to compile my own and fight with Fedora's package management. Rawhide has firewalld-filesystem-0.9.0-1.fc34.noarch.rpm Would that install cleanly on Fedora 32? Alternatively, is it reasonable to run the nftable service as well as firewalld? Alternatively, is --direct able to add nftable rules? It is documented to run iptables rules and I'd rather not use iptables. Suggestions?

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typo in firewall-cmd(1)
by D. Hugh Redelmeier 24 Sep '20

24 Sep '20

<https://github.com/firewalld/firewalld.github.io/blob/master/documentation/…> In line 714 (the first line with "Fedora") ends with: is be used on Fedora. It should be something like is to be used on Fedora. or perhaps is used on Fedora.

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Block visitor by countries.
by Jason Long 24 Sep '20

24 Sep '20

Hello, How can I find the IP range of countries and how can I block countries by IP address? Is it possible to block visitors by browser, operating systems or etc? Thank you.

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I added below rules and I lost everything.
by Jason Long 23 Sep '20

23 Sep '20

Hello, I have a web server that port 22,80 and 443 of it is opened in firewalld, I added below rules and lost everything: # firewall-cmd --permanent --direct --add-rule \ ipv4 filter INPUT 0 -j NFQUEUE # firewall-cmd --permanent --direct --add-rule \ ipv4 filter OUTPUT 0 -j NFQUEUE # firewall-cmd --reload I can't connect to my server and my web site take down too. How can I correct or delete these rules? I added these rules because of IPS: https://forum.suricata.io/t/guide-getting-started-on-centos-8-and-centos-7/… Thank you.

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firewalld + openvswitch
by Gal Anonim 21 Sep '20

21 Sep '20

Hi, After creating openvswitch bridge, there are multiple interfaces ("ovs parts") left. To which firewalld zones they belong? (entire setup is working - I am just researching proper configuration) ovs bridge was created via nmcli, existing interfaces (nmcli c s): br0 - ovs-bridge br0_p01 - ovs-port br0_p02 - ovs-port br0_p01_i - ovs-interface (this is the only one with IP address) ens1 - ethernet (ip a s) shows only ens1 and br0_p01_i interfaces. (firewall-cmd --get-active-zones) shows all of them. The functional interface (br0_p01_i) belongs to zone with whatever its function is (internal, external, dmz, ...). All of the remaining interfaces ended up in public zone (I am guessing NM added them to "default" zone). Can I disable all of the filtering (by firewalld) on the ovs bridge? How? Since ovs is layer 2, than in theory firewalld (which is basicly layer 3 filter) should not be involved at all. Than why assign, a non-layer 3 interfaces to a layer 3 firewall zone? Any insights are welcomed. CentOS 8 was used for this setup.

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Firewalld as IPS.
by Jason Long 21 Sep '20

21 Sep '20

Hello, Can I used Firewalld as an IPS or something like Fail2ban? Thank you.

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Enabling firewalld is breaking my docker connectivity, need some more eyes on the problem
by Gunnar Niels 10 Sep '20

10 Sep '20

Hello, I have docker and firewalld both installed on my Arch Linux machine and have been happy with them so far, although I've recently run into an issue where I've broken what seems to be DNS for internal running containers, and I'm trying to isolate the reason for that. Recently I created a bridge with my primary static ip address and added my physical NIC as a slave on the bridge so that I'd be able to run libvirt VMs that appeared to be machines directly on my local network. That has all worked as expected: --- # ipb link lo UNKNOWN 00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP> enp0s25 UP d0:50:99:a5:08:49 <BROADCAST,MULTICAST,UP,LOWER_UP> exbr UP 9a:5f:b2:1e:94:a7 <BROADCAST,MULTICAST,UP,LOWER_UP> virbr0 DOWN 52:54:00:4f:ca:69 <NO-CARRIER,BROADCAST,MULTICAST,UP> virbr0-nic DOWN 52:54:00:4f:ca:69 <BROADCAST,MULTICAST> docker0 DOWN 02:42:dd:21:67:40 <NO-CARRIER,BROADCAST,MULTICAST,UP> # bridge link show 2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master exbr state forwarding priority 32 cost 100 5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 master virbr0 state disabled priority 32 cost 100 # ipb a lo UNKNOWN 127.0.0.1/8 ::1/128 enp0s25 UP exbr UP 192.168.2.97/24 fe80::985f:b2ff:fe1e:94a7/64 virbr0 DOWN 192.168.100.1/24 virbr0-nic DOWN docker0 DOWN 172.17.0.1/16 fe80::46e8:567:b3cf:1aa1/64 --- My problem has suddenly become: My docker containers do not appear to be capable of dns requests unless I *disable* firwalld, something I obviously do not want to do. So, I've taken the approach of turning off the firewalld, restarting docker, and capturing the known good iptables dump, and then tried to compare it to a known bad dump that is produced after I turn on firewalld and restart docker. Interestingly *they are identical* as far as I can tell [1]. Additionally, I tried to TRACE the traffic, and I'm seeing some very confusing info out of the kernel logs: When things are configured in the "bad" state, the last log I see is: Sep 08 06:08:49 baldur kernel: TRACE: filter:FORWARD:rule:5 IN=docker0 OUT=exbrPHYSIN=veth7880ce1 MAC=02:42:dd:21:67:40:02:42:ac:11:00:02:08:00 SRC=172.17.0.2 DST=192.168.2.1 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=45314 DF PROTO=UDP SPT=45834 DPT=53 LEN=40 In my attached gist, you'll see the full iptables output dump for a "bad" configuration, and according to rule 5 on the filter FOREWARD chain....that's an accept all rule? So I'm very configured why this would be a problem. In the known working case, here are my traces: Failed trace output on filter rule 5 Sep 08 06:08:49 baldur kernel: TRACE: filter:DOCKER-ISOLATION-STAGE-1:return:2 IN=docker0 OUT=exbr PHYSIN=veth7880ce1 MAC=02:42:dd:21:67:40:02:42:ac:11:00:02:08:00 SRC=172.17.0.2 DST=192.168.2.1 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=45314 DF PROTO=UDP SPT=45834 DPT=53 LEN=40 Sep 08 06:08:49 baldur kernel: TRACE: filter:FORWARD:rule:5 IN=docker0 OUT=exbr PHYSIN=veth7880ce1 MAC=02:42:dd:21:67:40:02:42:ac:11:00:02:08:00 SRC=172.17.0.2 DST=192.168.2.1 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=45314 DF PROTO=UDP SPT=45834 DPT=53 LEN=40 Sep 08 06:08:49 baldur kernel: TRACE: mangle:POSTROUTING:policy:1 IN=docker0 OUT=exbr PHYSIN=veth7880ce1 MAC=02:42:dd:21:67:40:02:42:ac:11:00:02:08:00 SRC=172.17.0.2 DST=192.168.2.1 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=45314 DF PROTO=UDP SPT=45834 DPT=53 LEN=40 So obviously something about disabling firewalld allows for the packet to pass through the forward chain and hit the mangle POSTROUTING. It's completely unclear to me how to diagnose what might be going on here, any tips appreciated. I have the fully verbose outputs in this gist: [1] https://gist.github.com/gunnarniels/6826a7ad6f8b800f4c0b68eca98e071e GN

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firewalld-users September 2020