iptables 似乎没有阻止我禁止的 IP

2024-5-29 • tag-icon

为了进行测试，我启动了 TorBrowser，获取了它的 IP，并通过以下命令在我的 VPS 上禁止了它：

sudo iptables -A INPUT -s <IP address> -j DROP

我仍然可以通过 TorBrowser 浏览我服务器托管的页面。我甚至仔细检查了 HTTP access.log，以确保 IP 是我禁止的，结果确实如此。我遗漏了什么？

我的 iptables 文件在启动时被读取（通过iptables-restore）

#  Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 -j REJECT

# IP bans
-A INPUT -s 42.121.24.80 -j DROP
-A INPUT -s 121.196.43.157 -j DROP
-A INPUT -s 192.30.85.135 -j DROP
-A INPUT -s 94.102.53.175 -j DROP

#  Accept all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#  Allow all outbound traffic - you can modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

#  Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL).
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT
-A INPUT -p tcp --dport 8080 -j ACCEPT

# Mail
-A INPUT -p tcp --dport 993 -j ACCEPT
-A INPUT -p tcp --dport 465 -j ACCEPT
-A INPUT -p tcp --dport 587 -j ACCEPT
-A INPUT -p tcp --dport 25 -j ACCEPT

# Minecraft
-A INPUT -p tcp --dport 25565 -j ACCEPT

#  Allow SSH connections
#
#  The -dport number should be the same port number you set in sshd_config
#
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

#  Allow ping
-A INPUT -p icmp -j ACCEPT

#  Log iptables denied calls
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

#  Drop all other inbound - default deny unless explicitly allowed policy
-A INPUT -j DROP
-A FORWARD -j DROP

COMMIT

并iptables -L输出：

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            
REJECT     all  --  anywhere             127.0.0.0/8          reject-with icmp-port-unreachable
DROP       all  --  out524-80.mail.aliyun.com  anywhere            
DROP       all  --  ip196.hichina.com    anywhere            
DROP       all  --  192.30.85.135-IP-Static-VISPERAD.COM  anywhere            
DROP       all  --  tor-exit-nl1.privacyfoundation.dk  anywhere            
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http-alt
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imaps
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssmtp
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:submission
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:25565
ACCEPT     tcp  --  anywhere             anywhere             state NEW tcp dpt:ssh
ACCEPT     icmp --  anywhere             anywhere            
LOG        all  --  anywhere             anywhere             limit: avg 5/min burst 5 LOG level debug prefix "iptables denied: "
DROP       all  --  anywhere             anywhere            

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere

答案1

dmourati 要求的iptables -L INPUT原因，即您当前的规则。
在测试 torbrowser 之前，您有已发布的规则（或类似规则）。
现在在中间：

-A INPUT -p tcp --dport 80 -j ACCEPT

之后你执行

iptables -A INPUT -s <IP address> -j DROP

因此，您的规则在您接受所有 80 端口流量之后结束，因此无需丢弃任何流量，因为流量已被接受。
您应该使用以下方式添加规则

iptables -I INPUT -s <IP address> -j DROP

答案2

如果您希望优先使用 drop 命令，则需要在允许端口 80 的 append (-A) 命令之前插入 (-I) 该命令。

顺序很重要，请尝试：

sudo iptables -I INPUT -s <IP address> -j DROP

答案1

答案2

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