cloudflare的一些应用案例
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3,070
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安全配置,环境搭建

1040 字
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7 分钟

1.nginx使用cloudflare并且将游客真实IP记录的nginx日志
(1).编译nginx的时候在编译参数加上 

--with-http_realip_module

(2).在nginx.conf里http段加入

set_real_ip_from 173.245.48.0/20;
set_real_ip_from 103.21.244.0/22;
set_real_ip_from 103.22.200.0/22;
set_real_ip_from 103.31.4.0/22;
set_real_ip_from 141.101.64.0/18;
set_real_ip_from 108.162.192.0/18;
set_real_ip_from 190.93.240.0/20;
set_real_ip_from 188.114.96.0/20;
set_real_ip_from 197.234.240.0/22;
set_real_ip_from 198.41.128.0/17;
set_real_ip_from 162.158.0.0/15;
set_real_ip_from 172.64.0.0/13;
set_real_ip_from 131.0.72.0/22;
set_real_ip_from 104.16.0.0/13;
set_real_ip_from 104.24.0.0/14;
set_real_ip_from 2400:cb00::/32
set_real_ip_from 2606:4700::/32
set_real_ip_from 2803:f800::/32
set_real_ip_from 2405:b500::/32
set_real_ip_from 2405:8100::/32
set_real_ip_from 2a06:98c0::/29
set_real_ip_from 2c0f:f248::/32

# use any of the following two
real_ip_header CF-Connecting-IP;
#real_ip_header X-Forwarded-For;

类似如下

http
    {
        include       mime.types;
        default_type  application/octet-stream;

        set_real_ip_from 103.21.244.0/22;
        set_real_ip_from 103.22.200.0/22;
        set_real_ip_from 103.31.4.0/22;
        set_real_ip_from 104.16.0.0/12;
        set_real_ip_from 108.162.192.0/18;
        set_real_ip_from 131.0.72.0/22;
        set_real_ip_from 141.101.64.0/18;
        set_real_ip_from 162.158.0.0/15;
        set_real_ip_from 172.64.0.0/13;
        set_real_ip_from 173.245.48.0/20;
        set_real_ip_from 188.114.96.0/20;
        set_real_ip_from 190.93.240.0/20;
        set_real_ip_from 197.234.240.0/22;
        set_real_ip_from 198.41.128.0/17;
        set_real_ip_from 199.27.128.0/21;
        set_real_ip_from 2400:cb00::/32;
        set_real_ip_from 2606:4700::/32;
        set_real_ip_from 2803:f800::/32;
        set_real_ip_from 2405:b500::/32;
        set_real_ip_from 2405:8100::/32;
        set_real_ip_from 2c0f:f248::/32;
        set_real_ip_from 2a06:98c0::/29;

        # use any of the following two
        real_ip_header CF-Connecting-IP;
        #real_ip_header X-Forwarded-For;

        server_names_hash_bucket_size 128;
        client_header_buffer_size 32k;
        large_client_header_buffers 4 32k;
        client_max_body_size 50m;
        .......
        .......
        .......

cloudflare的反代IP可以在下面地址找到
https://www.cloudflare.com/ips/

2.web服务器只允许通过cloudflare访问(禁止其他机器访问80、443，只允许cloudflare),按照Debian官网给的iptables配置，加入cloudflare白名单，具体如下

nano /etc/iptables.test.rules

*filter

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

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

# Allows all outbound traffic
# You could modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

# Allows HTTP and HTTPS connections from anywhere (the normal ports for websites)
#-A INPUT -p tcp --dport 80 -j ACCEPT
#-A INPUT -p tcp --dport 443 -j ACCEPT
-A INPUT -s 103.21.244.0/22 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 103.22.200.0/22 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 103.31.4.0/22 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 104.16.0.0/12 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 108.162.192.0/18 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 131.0.72.0/22 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 141.101.64.0/18 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 162.158.0.0/15 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 172.64.0.0/13 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 173.245.48.0/20 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 188.114.96.0/20 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 190.93.240.0/20 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 197.234.240.0/22 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 198.41.128.0/17 -p tcp -m multiport --dports 80,443 -j ACCEPT
-A INPUT -s 199.27.128.0/21 -p tcp -m multiport --dports 80,443 -j ACCEPT

# Allows SSH connections 
# The --dport number is the same as in /etc/ssh/sshd_config
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

# Now you should read up on iptables rules and consider whether ssh access 
# for everyone is really desired. Most likely you will only allow access from certain IPs.

# Allow ping
#  note that blocking other types of icmp packets is considered a bad idea by some
#  remove -m icmp --icmp-type 8 from this line to allow all kinds of icmp:
#  https://security.stackexchange.com/questions/22711
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT

# log iptables denied calls (access via 'dmesg' command)
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

# Reject all other inbound - default deny unless explicitly allowed policy:
-A INPUT -j REJECT
-A FORWARD -j REJECT

COMMIT

保存
IP列表同样参考https://www.cloudflare.com/ips/

#导入规则
iptables-restore < /etc/iptables.test.rules
#重新导出
iptables-save > /etc/iptables.up.rules
#编辑iptables开机启动文件
nano /etc/network/if-pre-up.d/iptables

/etc/network/if-pre-up.d/iptables内容为

#!/bin/sh
/sbin/iptables-restore < /etc/iptables.up.rules

然后给执行权限

chmod +x /etc/network/if-pre-up.d/iptables

Debian防火墙参考
https://wiki.debian.org/iptables

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