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SoabTI
Asked: 2016-06-10 06:06:57 +0800 CST

IPTables 策略 INPUT DROP 但接受连接

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我使用以下规则配置了 iptables：

iptables -I INPUT -p tcp --dport 22 -j ACCEPT
iptables -P INPUT DROP
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -I INPUT -i lo -j ACCEPT
iptables -A INPUT -m conntrack --ctstate ESTABLISHED, RELATED -j ACCEPT
iptables -A INPUT -p tcp --dport 53 -j ACCEPT
iptables -A INPUT -p udp --dport 53 -j ACCEPT

但 nmap 指责除了80, 22 and 53

root @ ns1: / # iptables -L
Chain INPUT (policy DROP)
target prot opt ​​source destination
ACCEPT all - anywhere anywhere
ACCEPT tcp - anywhere anywhere tcp dpt: ssh
ACCEPT tcp - anywhere anywhere tcp dpt: http
ACCEPT tcp - anywhere anywhere tcp dpt: https
ACCEPT all - anywhere anywhere ctstate RELATED, ESTABLISHED
ACCEPT tcp - anywhere anywhere tcp dpt: domain
ACCEPT udp - anywhere anywhere udp dpt: domain

Chain FORWARD (policy ACCEPT)
target prot opt ​​source destination

Chain OUTPUT (policy ACCEPT)
target prot opt ​​source destination
root @ ns1: / # nmap -vv 10.0.0.2
...
PORT STATE SERVICE
22 / tcp open ssh
53 / tcp open domain
80 / tcp open http
111 / tcp open rpcbind
139 / tcp open netbios-ssn
445 / tcp open microsoft-ds
...

可能会发生什么？我相信这些端口111 139 445不会出现

debian iptables nmap

1 个回答

  1. Best Answer

    两点：

    删除从任何地方接受任何内容的第一条规则：

    #iptables -D INPUT 1

    然后考虑到任何打开的连接仍然能够通过 iptables，因为它在创建规则之前已经建立，所以也许服务重启会修复它

    • 0

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