Início / computer / Perguntas / 1474254
Accepted
Eduardo Lucio
Asked: 2019-08-23 12:17:27 +0800 CST

firewall-cmd - add-forward-port não funciona

  • 772

Eu tenho um servidor KVM (host) com várias máquinas virtuais (convidados).

Meu objetivo é meu host encaminhar a porta 222 para a porta 22 de um convidado executando um serviço ssh.

Isso funciona ...

iptables -I OUTPUT -d 0.0.0.0/0 -j ACCEPT
iptables -I FORWARD -d 0.0.0.0/0 -j ACCEPT
iptables -I INPUT -d 0.0.0.0/0 -j ACCEPT
iptables -t nat -I PREROUTING -d 0.0.0.0/0 -p tcp --dport 222 -j DNAT --to-destination 10.1.0.9:22

Isso não funciona ...

firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter OUTPUT 0 -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter FORWARD 0 -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter INPUT 0 -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --direct --add-rule ipv4 nat PREROUTING 0 -d 0.0.0.0/0 -p tcp --dport 222 -j DNAT --to-destination 10.1.0.9:22
firewall-cmd --reload

Isso também não funciona ...

firewall-cmd --permanent --zone=public --add-forward-port=port=222:proto=tcp:toport=22:toaddr=10.1.0.9
firewall-cmd --reload

PERGUNTA: Por que as regras definidas com firewall-cmdnão funcionam?

NOTA I: O firewall-cmdé o serviço de firewall padrão do CentOS 7. Isso me parece um problema sem solução! Pesquisei em muitos, muitos fóruns e nada funciona! Estou começando a acreditar que isso é uma limitação ou bug no firewall-cmd...

OBS II: Sei que sshele próprio fornece os meios para tornar isso possível, mas quero muito que esse processo seja "transparente" para o usuário acessar diretamente o convidado.

[ Refs.: https://serverfault.com/q/915257/276753 , https://serverfault.com/q/980223/276753 , https://sebastianblade.com/how-to-modify-ssh-port- in-centos7/ , https://www.rootusers.com/how-to-use-firewalld-rich-rules-and-zones-for-filtering-and-nat/ , https://www.centos.org/ fóruns/viewtopic.php?f=50&t=71454 ]

SINTOMA:

O comando...

ssh root@[HOST_IP] -p 222

... me retorna o seguinte erro...

ssh: conectar ao host 172.16.13.8 porta 222: Conexão recusada

ATUALIZAÇÃO I:

@mwfearnley iptables-salvar saída...

iptables-save - FUNCIONA...

[root@localhost ~]# iptables-save
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:17 2019
*nat
:PREROUTING ACCEPT [1:70]
:INPUT ACCEPT [1:70]
:OUTPUT ACCEPT [2:146]
:POSTROUTING ACCEPT [3:206]
:OUTPUT_direct - [0:0]
:POSTROUTING_ZONES - [0:0]
:POSTROUTING_ZONES_SOURCE - [0:0]
:POSTROUTING_direct - [0:0]
:POST_public - [0:0]
:POST_public_allow - [0:0]
:POST_public_deny - [0:0]
:POST_public_log - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -p tcp -m tcp --dport 222 -j DNAT --to-destination 10.1.0.9:22
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -s 10.1.0.0/24 -d 224.0.0.0/24 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 -d 255.255.255.255/32 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -j MASQUERADE
-A POSTROUTING -j POSTROUTING_direct
-A POSTROUTING -j POSTROUTING_ZONES_SOURCE
-A POSTROUTING -j POSTROUTING_ZONES
-A POSTROUTING_ZONES -o ens33 -g POST_public
-A POSTROUTING_ZONES -o br0 -g POST_public
-A POSTROUTING_ZONES -g POST_public
-A POST_public -j POST_public_log
-A POST_public -j POST_public_deny
-A POST_public -j POST_public_allow
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:17 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:17 2019
*mangle
:PREROUTING ACCEPT [672:77587]
:INPUT ACCEPT [610:68993]
:FORWARD ACCEPT [58:7886]
:OUTPUT ACCEPT [655:151604]
:POSTROUTING ACCEPT [713:159490]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
:POSTROUTING_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:17 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:17 2019
*security
:INPUT ACCEPT [609:68793]
:FORWARD ACCEPT [58:7886]
:OUTPUT ACCEPT [660:152010]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
COMMIT
# Completed on Thu Aug 22 11:59:17 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:17 2019
*raw
:PREROUTING ACCEPT [672:77587]
:OUTPUT ACCEPT [655:151604]
:OUTPUT_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:17 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:17 2019
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FORWARD_IN_ZONES - [0:0]
:FORWARD_IN_ZONES_SOURCE - [0:0]
:FORWARD_OUT_ZONES - [0:0]
:FORWARD_OUT_ZONES_SOURCE - [0:0]
:FORWARD_direct - [0:0]
:FWDI_public - [0:0]
:FWDI_public_allow - [0:0]
:FWDI_public_deny - [0:0]
:FWDI_public_log - [0:0]
:FWDO_public - [0:0]
:FWDO_public_allow - [0:0]
:FWDO_public_deny - [0:0]
:FWDO_public_log - [0:0]
:INPUT_ZONES - [0:0]
:INPUT_ZONES_SOURCE - [0:0]
:INPUT_direct - [0:0]
:IN_public - [0:0]
:IN_public_allow - [0:0]
:IN_public_deny - [0:0]
:IN_public_log - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j ACCEPT
-A INPUT -i virbr0 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES_SOURCE
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j ACCEPT
-A FORWARD -d 10.1.0.0/24 -o virbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s 10.1.0.0/24 -i virbr0 -j ACCEPT
-A FORWARD -i virbr0 -o virbr0 -j ACCEPT
-A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES_SOURCE
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES_SOURCE
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -j ACCEPT
-A OUTPUT -o virbr0 -p udp -m udp --dport 68 -j ACCEPT
-A OUTPUT -j OUTPUT_direct
-A FORWARD_IN_ZONES -i ens33 -g FWDI_public
-A FORWARD_IN_ZONES -i br0 -g FWDI_public
-A FORWARD_IN_ZONES -g FWDI_public
-A FORWARD_OUT_ZONES -o ens33 -g FWDO_public
-A FORWARD_OUT_ZONES -o br0 -g FWDO_public
-A FORWARD_OUT_ZONES -g FWDO_public
-A FWDI_public -j FWDI_public_log
-A FWDI_public -j FWDI_public_deny
-A FWDI_public -j FWDI_public_allow
-A FWDI_public -p icmp -j ACCEPT
-A FWDO_public -j FWDO_public_log
-A FWDO_public -j FWDO_public_deny
-A FWDO_public -j FWDO_public_allow
-A INPUT_ZONES -i ens33 -g IN_public
-A INPUT_ZONES -i br0 -g IN_public
-A INPUT_ZONES -g IN_public
-A IN_public -j IN_public_log
-A IN_public -j IN_public_deny
-A IN_public -j IN_public_allow
-A IN_public -p icmp -j ACCEPT
-A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
COMMIT
# Completed on Thu Aug 22 11:59:17 2019

iptables-save - NÃO FUNCIONA...

[root@localhost ~]# iptables-save
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:16 2019
*nat
:PREROUTING ACCEPT [1:72]
:INPUT ACCEPT [1:72]
:OUTPUT ACCEPT [5:371]
:POSTROUTING ACCEPT [5:371]
:OUTPUT_direct - [0:0]
:POSTROUTING_ZONES - [0:0]
:POSTROUTING_ZONES_SOURCE - [0:0]
:POSTROUTING_direct - [0:0]
:POST_public - [0:0]
:POST_public_allow - [0:0]
:POST_public_deny - [0:0]
:POST_public_log - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -s 10.1.0.0/24 -d 224.0.0.0/24 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 -d 255.255.255.255/32 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -j MASQUERADE
-A POSTROUTING -j POSTROUTING_direct
-A POSTROUTING -j POSTROUTING_ZONES_SOURCE
-A POSTROUTING -j POSTROUTING_ZONES
-A POSTROUTING_ZONES -o ens33 -g POST_public
-A POSTROUTING_ZONES -o br0 -g POST_public
-A POSTROUTING_ZONES -g POST_public
-A POST_public -j POST_public_log
-A POST_public -j POST_public_deny
-A POST_public -j POST_public_allow
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PREROUTING_direct -p tcp -m tcp --dport 222 -j DNAT --to-destination 10.1.0.9:22
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:16 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:16 2019
*mangle
:PREROUTING ACCEPT [12:1319]
:INPUT ACCEPT [11:1259]
:FORWARD ACCEPT [1:60]
:OUTPUT ACCEPT [12:1070]
:POSTROUTING ACCEPT [12:1070]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
:POSTROUTING_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:16 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:16 2019
*security
:INPUT ACCEPT [11:1259]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [12:1070]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
COMMIT
# Completed on Thu Aug 22 11:59:16 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:16 2019
*raw
:PREROUTING ACCEPT [12:1319]
:OUTPUT ACCEPT [12:1070]
:OUTPUT_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:16 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:16 2019
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FORWARD_IN_ZONES - [0:0]
:FORWARD_IN_ZONES_SOURCE - [0:0]
:FORWARD_OUT_ZONES - [0:0]
:FORWARD_OUT_ZONES_SOURCE - [0:0]
:FORWARD_direct - [0:0]
:FWDI_public - [0:0]
:FWDI_public_allow - [0:0]
:FWDI_public_deny - [0:0]
:FWDI_public_log - [0:0]
:FWDO_public - [0:0]
:FWDO_public_allow - [0:0]
:FWDO_public_deny - [0:0]
:FWDO_public_log - [0:0]
:INPUT_ZONES - [0:0]
:INPUT_ZONES_SOURCE - [0:0]
:INPUT_direct - [0:0]
:IN_public - [0:0]
:IN_public_allow - [0:0]
:IN_public_deny - [0:0]
:IN_public_log - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -i virbr0 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES_SOURCE
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -d 10.1.0.0/24 -o virbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s 10.1.0.0/24 -i virbr0 -j ACCEPT
-A FORWARD -i virbr0 -o virbr0 -j ACCEPT
-A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES_SOURCE
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES_SOURCE
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o virbr0 -p udp -m udp --dport 68 -j ACCEPT
-A OUTPUT -j OUTPUT_direct
-A FORWARD_IN_ZONES -i ens33 -g FWDI_public
-A FORWARD_IN_ZONES -i br0 -g FWDI_public
-A FORWARD_IN_ZONES -g FWDI_public
-A FORWARD_OUT_ZONES -o ens33 -g FWDO_public
-A FORWARD_OUT_ZONES -o br0 -g FWDO_public
-A FORWARD_OUT_ZONES -g FWDO_public
-A FORWARD_direct -j ACCEPT
-A FWDI_public -j FWDI_public_log
-A FWDI_public -j FWDI_public_deny
-A FWDI_public -j FWDI_public_allow
-A FWDI_public -p icmp -j ACCEPT
-A FWDO_public -j FWDO_public_log
-A FWDO_public -j FWDO_public_deny
-A FWDO_public -j FWDO_public_allow
-A INPUT_ZONES -i ens33 -g IN_public
-A INPUT_ZONES -i br0 -g IN_public
-A INPUT_ZONES -g IN_public
-A INPUT_direct -j ACCEPT
-A IN_public -j IN_public_log
-A IN_public -j IN_public_deny
-A IN_public -j IN_public_allow
-A IN_public -p icmp -j ACCEPT
-A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
-A OUTPUT_direct -j ACCEPT
COMMIT
# Completed on Thu Aug 22 11:59:16 2019

iptables-save - NÃO FUNCIONA TAMBÉM...

[root@localhost ~]# iptables-save
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:36 2019
*nat
:PREROUTING ACCEPT [5:371]
:INPUT ACCEPT [1:67]
:OUTPUT ACCEPT [2:134]
:POSTROUTING ACCEPT [2:134]
:OUTPUT_direct - [0:0]
:POSTROUTING_ZONES - [0:0]
:POSTROUTING_ZONES_SOURCE - [0:0]
:POSTROUTING_direct - [0:0]
:POST_public - [0:0]
:POST_public_allow - [0:0]
:POST_public_deny - [0:0]
:POST_public_log - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -s 10.1.0.0/24 -d 224.0.0.0/24 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 -d 255.255.255.255/32 -j RETURN
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p tcp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -p udp -j MASQUERADE --to-ports 1024-65535
-A POSTROUTING -s 10.1.0.0/24 ! -d 10.1.0.0/24 -j MASQUERADE
-A POSTROUTING -j POSTROUTING_direct
-A POSTROUTING -j POSTROUTING_ZONES_SOURCE
-A POSTROUTING -j POSTROUTING_ZONES
-A POSTROUTING_ZONES -o ens33 -g POST_public
-A POSTROUTING_ZONES -o br0 -g POST_public
-A POSTROUTING_ZONES -g POST_public
-A POST_public -j POST_public_log
-A POST_public -j POST_public_deny
-A POST_public -j POST_public_allow
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public_allow -p tcp -m mark --mark 0x64 -j DNAT --to-destination 10.1.0.9:22
COMMIT
# Completed on Thu Aug 22 11:59:36 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:36 2019
*mangle
:PREROUTING ACCEPT [17:1649]
:INPUT ACCEPT [12:1285]
:FORWARD ACCEPT [5:364]
:OUTPUT ACCEPT [10:3037]
:POSTROUTING ACCEPT [14:3341]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
:POSTROUTING_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
-A POSTROUTING -j POSTROUTING_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
-A PRE_public_allow -p tcp -m tcp --dport 222 -j MARK --set-xmark 0x64/0xffffffff
COMMIT
# Completed on Thu Aug 22 11:59:36 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:36 2019
*security
:INPUT ACCEPT [12:1285]
:FORWARD ACCEPT [4:304]
:OUTPUT ACCEPT [10:3037]
:FORWARD_direct - [0:0]
:INPUT_direct - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -j INPUT_direct
-A FORWARD -j FORWARD_direct
-A OUTPUT -j OUTPUT_direct
COMMIT
# Completed on Thu Aug 22 11:59:36 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:36 2019
*raw
:PREROUTING ACCEPT [17:1649]
:OUTPUT ACCEPT [10:3037]
:OUTPUT_direct - [0:0]
:PREROUTING_ZONES - [0:0]
:PREROUTING_ZONES_SOURCE - [0:0]
:PREROUTING_direct - [0:0]
:PRE_public - [0:0]
:PRE_public_allow - [0:0]
:PRE_public_deny - [0:0]
:PRE_public_log - [0:0]
-A PREROUTING -j PREROUTING_direct
-A PREROUTING -j PREROUTING_ZONES_SOURCE
-A PREROUTING -j PREROUTING_ZONES
-A OUTPUT -j OUTPUT_direct
-A PREROUTING_ZONES -i ens33 -g PRE_public
-A PREROUTING_ZONES -i br0 -g PRE_public
-A PREROUTING_ZONES -g PRE_public
-A PRE_public -j PRE_public_log
-A PRE_public -j PRE_public_deny
-A PRE_public -j PRE_public_allow
COMMIT
# Completed on Thu Aug 22 11:59:36 2019
# Generated by iptables-save v1.4.21 on Thu Aug 22 11:59:36 2019
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [8:2813]
:FORWARD_IN_ZONES - [0:0]
:FORWARD_IN_ZONES_SOURCE - [0:0]
:FORWARD_OUT_ZONES - [0:0]
:FORWARD_OUT_ZONES_SOURCE - [0:0]
:FORWARD_direct - [0:0]
:FWDI_public - [0:0]
:FWDI_public_allow - [0:0]
:FWDI_public_deny - [0:0]
:FWDI_public_log - [0:0]
:FWDO_public - [0:0]
:FWDO_public_allow - [0:0]
:FWDO_public_deny - [0:0]
:FWDO_public_log - [0:0]
:INPUT_ZONES - [0:0]
:INPUT_ZONES_SOURCE - [0:0]
:INPUT_direct - [0:0]
:IN_public - [0:0]
:IN_public_allow - [0:0]
:IN_public_deny - [0:0]
:IN_public_log - [0:0]
:OUTPUT_direct - [0:0]
-A INPUT -i virbr0 -p udp -m udp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT
-A INPUT -i virbr0 -p udp -m udp --dport 67 -j ACCEPT
-A INPUT -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES_SOURCE
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -d 10.1.0.0/24 -o virbr0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s 10.1.0.0/24 -i virbr0 -j ACCEPT
-A FORWARD -i virbr0 -o virbr0 -j ACCEPT
-A FORWARD -o virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -i virbr0 -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -j FORWARD_direct
-A FORWARD -j FORWARD_IN_ZONES_SOURCE
-A FORWARD -j FORWARD_IN_ZONES
-A FORWARD -j FORWARD_OUT_ZONES_SOURCE
-A FORWARD -j FORWARD_OUT_ZONES
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o virbr0 -p udp -m udp --dport 68 -j ACCEPT
-A OUTPUT -j OUTPUT_direct
-A FORWARD_IN_ZONES -i ens33 -g FWDI_public
-A FORWARD_IN_ZONES -i br0 -g FWDI_public
-A FORWARD_IN_ZONES -g FWDI_public
-A FORWARD_OUT_ZONES -o ens33 -g FWDO_public
-A FORWARD_OUT_ZONES -o br0 -g FWDO_public
-A FORWARD_OUT_ZONES -g FWDO_public
-A FWDI_public -j FWDI_public_log
-A FWDI_public -j FWDI_public_deny
-A FWDI_public -j FWDI_public_allow
-A FWDI_public -p icmp -j ACCEPT
-A FWDI_public_allow -m conntrack --ctstate NEW -m mark --mark 0x64 -j ACCEPT
-A FWDO_public -j FWDO_public_log
-A FWDO_public -j FWDO_public_deny
-A FWDO_public -j FWDO_public_allow
-A INPUT_ZONES -i ens33 -g IN_public
-A INPUT_ZONES -i br0 -g IN_public
-A INPUT_ZONES -g IN_public
-A IN_public -j IN_public_log
-A IN_public -j IN_public_deny
-A IN_public -j IN_public_allow
-A IN_public -p icmp -j ACCEPT
-A IN_public_allow -p tcp -m tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
COMMIT
# Completed on Thu Aug 22 11:59:36 2019

ATUALIZAÇÃO II:

A primeira regra em FORWARD de "works" é ACEITAR. Isso permite que cada pacote seja encaminhado. Os outros têm regras para aceitar pacotes DNATted, mas mais tarde na cadeia. Então... Podemos resolver o problema se descobrirmos por que isso funciona ...

iptables -I FORWARD -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --add-forward-port=port=222:proto=tcp:toport=22:toaddr=10.1.0.9
firewall-cmd --reload

... e por que isso não ...

firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter FORWARD 0 -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --add-forward-port=port=222:proto=tcp:toport=22:toaddr=10.1.0.9
firewall-cmd --reload
port-forwarding firewall

1 respostas

  1. Best Answer

    O VERDADEIRO PROBLEMA:

    O comando...

    firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter FORWARD 0 -d 0.0.0.0/0 -j ACCEPT
firewall-cmd --permanent --zone=public --add-forward-port=port=222:proto=tcp:toport=22:toaddr=10.1.0.9
firewall-cmd --reload

    ... descrito em "UPDATE II" funciona tão bem quanto o firewalld (usado pelo CentOS 7).

    The problem is in the KVM (libvirt) which when starting the "network" virbr0 injects rules (probably via firewalld) which prevents (first match principle) any attempt to port forwarding by conventional ways using firewall-cmd. The KVM injected (libvirt) rules are at the top of FORWARD and POSTROUTING, before regular firewalld ruleset. Since the netfilter operates on first match principle, these rules.

    SOLUTION:

    Due to the problems generated by the rules injected by KVM (libvirt) into the firewall the solution is use a hack/workaround called libvirt-hook-qemu as we explained below...

    Download and install libvirt-hook-qemu...

    yum -y install git-core
cd /usr/local/src
git clone https://github.com/saschpe/libvirt-hook-qemu.git
cd libvirt-hook-qemu
make install
cd ..
rm -rf libvirt-hook-qemu

    List your virtual machines (guests)...

    virsh list --all

    ... and copy the name of the target virtual machine.

    Turn off the virtual machine...

    virsh shutdown "<VM_NAME>" --mode acpi

    Open the file "hooks.json", delete its contents...

    vi /etc/libvirt/hooks/hooks.json

    ... and enter your rules as the template below (other ways of setting up are possible)...

    {
    "<VM_NAME>": {
        "interface": "virbr0",
        "private_ip": "<VM_IP>",
        "port_map": {
            "tcp": [[<PORT_ON_HOST>, <PORT_ON_GUEST>]]
        }
    }
}

    Restart libvirtd...

    systemctl restart libvirtd.service

    ... and start the virtual machine...

    virsh start "<VM_NAME>"

    Done! =D

    FURTHER:

    This KVM (libvirt) behavior - injects rules which prevents any attempt to port forwarding - is IMPOSITIVE, INVASIVE AND UNNECESSARY... First because since there is no port forwarding on the host no virtual machine will be reachable on the default network (virbr0) and second because it forces us to use a hack/workaround (or "gato"/"gambiarra" as we call it in Brazil =D ).

    In our view makes no sense impose the user how he should build his infrastructure or not... This makes no sense! To put it bluntly, we think it would be best if these settings were optional (injects rules...) as other leading hypervisors do. And we go further... If is to KVM (libvirt) controlling this kind of thing then it should also offer ways to map ports to virtual machines.

    The KVM (libvirt) is a GREAT tool, but not all users are willing - for various reasons - to place their machines directly on the host machine's network just as not all users are willing to give up all the flexibility/accessibility that the default network (virbr0) offers.

    Thanks!

    [Refs.: https://bugzilla.redhat.com/show_bug.cgi?id=846810 , https://libvirt.org/firewall.html , https://libvirt.org/formatnetwork.html#examplesRoute, https://saschpe.wordpress.com/2014/03/06/dynamic-iptables-port-forwarding-for-nat-ed-libvirt-networks/ , https://serverfault.com/q/170079/276753 , https://serverfault.com/q/915257/276753 , https://wiki.libvirt.org/page/VirtualNetworking#Routed_mode , https://www.centos.org/forums/viewtopic.php?f=50&t=71454&sid=7f5190a29eebbf755235ec3dc404a47f , https://www.cyberciti.biz/faq/kvm-forward-ports-to-guests-vm-with-ufw-on-linux/ ]

    UPDATE:

    injects rules which prevents any attempt to port forwarding

    -> The current upstream of KVM (libvirt) has resolved the issue!

    See this: ...current upstream of KVM (libvirt) has resolved the issue...

    • 12

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