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防火墙命令拒绝目标地址

tag-icon • tag-icon redhat firewalld rhel7
防火墙命令拒绝目标地址

我正在使用以下内容：

# cat /etc/redhat-release 
CentOS Linux release 7.1.1503 (Core) 
# rpm -q firewalld
firewalld-0.3.9-11.el7.noarch
#

我正在尝试阻止特定 IP 地址 (10.52.208.220) 从我的系统访问它，但无法做到：

前：

# firewall-cmd --reload
success
# firewall-cmd --list-all
public (default, active)
  interfaces: eno1
  sources: 
  services: dhcpv6-client high-availability http https ssh
  ports: 5666/tcp 3306/tcp 5900/tcp 9001/tcp
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 

# ping -c1 wcmisdlin01
PING wcmisdlin01.uftmasterad.org (10.52.208.220) 56(84) bytes of data.
64 bytes from wcmisdlin01.uftmasterad.org (10.52.208.220): icmp_seq=1 ttl=64 time=0.379 ms

--- wcmisdlin01.uftmasterad.org ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.379/0.379/0.379/0.000 ms
#

后：

# firewall-cmd --add-rich-rule='rule family="ipv4" destination address="10.52.208.220" protocol value="icmp" reject'
success
# firewall-cmd --list-all
public (default, active)
  interfaces: eno1
  sources: 
  services: dhcpv6-client high-availability http https ssh
  ports: 5666/tcp 3306/tcp 5900/tcp 9001/tcp
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules: 
    rule family="ipv4" destination address="10.52.208.220" protocol value="icmp" reject

# ping -c1 wcmisdlin01
PING wcmisdlin01.uftmasterad.org (10.52.208.220) 56(84) bytes of data.
64 bytes from wcmisdlin01.uftmasterad.org (10.52.208.220): icmp_seq=1 ttl=64 time=0.266 ms

--- wcmisdlin01.uftmasterad.org ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.266/0.266/0.266/0.000 ms
#

IPTABLES(8) - iptables/ip6tables — administration tool for IPv4/IPv6 packet filtering and NAT

# iptables --list IN_public_deny
Chain IN_public_deny (1 references)
target     prot opt source               destination         
REJECT     icmp --  anywhere             wcmisdlin01.uftmasterad.org  ctstate NEW reject-with icmp-port-unreachable
#

我究竟做错了什么？

答案1

检查完整iptables -n --list输出后，IN_public_deny（最终）会从INPUT链中调用，这与从系统发送到未被拒绝的主机的数据包无关；这些数据包而是通过链进行路由OUTPUT（或者，FORWARD如果防火墙是源和目标之间的路由器或网桥，则可能是这样）。firewalld.richlanguage(5)似乎没有提供任何方法来指定规则必须进入OUTPUT（或FORWARD）链，因此直接规则的“最后手段”选项似乎是一种解决方案。

firewall-cmd --direct --add-rule ipv4 filter OUTPUT_direct 0 -p icmp -d 10.52.208.220 -j REJECT --reject-with icmp-host-prohibited

（虽然我通常更喜欢 DROP（并且可能使用速率限制进行 LOG）而不是发送 ICMP 拒绝，因为如果要被阻止的主机发疯了，将 ICMP 响应数据包扔回到负担沉重的网络上会使事情变得越来越糟...）

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