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Fail2Ban 新增了 iptable 規則但不起作用？

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Fail2Ban 新增了 iptable 規則但不起作用？

Fail2Ban 剛剛阻止了我的 IP 3 次 SSH 嘗試。它添加了 iptables 規則，我可以使用“sudo iptables -L -n”命令查看它。但我仍然可以訪問該網站並透過 SSH 登入！可能是什麼問題？是因為我使用 CloudFlare 嗎？我已將 Nginx 設定為將真實 IP 而不是 Cloud Flare IP 寫入存取日誌。還不夠嗎？

Chain fail2ban-ssh (1 references)
 target     prot opt source               destination         
 DROP       all  --  119.235.14.8         0.0.0.0/0           
 RETURN     all  --  0.0.0.0/0            0.0.0.0/0

輸入鏈：

Chain INPUT (policy DROP)

    target     prot opt source               destination         
    fail2ban-NoAuthFailures  tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:80
    fail2ban-nginx-dos  tcp  --  0.0.0.0/0            0.0.0.0/0            multiport dports 80,8090
    fail2ban-postfix  tcp  --  0.0.0.0/0            0.0.0.0/0            multiport dports 25,465
    fail2ban-ssh-ddos  tcp  --  0.0.0.0/0            0.0.0.0/0            multiport dports 22
    fail2ban-ssh  tcp  --  0.0.0.0/0            0.0.0.0/0            multiport dports 22
    ufw-before-logging-input  all  --  0.0.0.0/0            0.0.0.0/0           
    ufw-before-input  all  --  0.0.0.0/0            0.0.0.0/0           
    ufw-after-input  all  --  0.0.0.0/0            0.0.0.0/0           
    ufw-after-logging-input  all  --  0.0.0.0/0            0.0.0.0/0           
    ufw-reject-input  all  --  0.0.0.0/0            0.0.0.0/0           
    ufw-track-input  all  --  0.0.0.0/0            0.0.0.0/0           
    LOG        all  --  0.0.0.0/0            0.0.0.0/0            LOG flags 0 level 4

答案1

2019 更新：原始答案中使用的 API 已被棄用，改用 API v4，請改用新版本。 Cloudflare 的 Fail2ban 解禁作業失敗謝謝@baptx 評論

iptables無法取得真實的ip，因此您應該使用cloudflare的api將雲端上的IP列入黑名單。

這是我的操作設定檔

# Fail2Ban configuration file
#
# Author: Charles Chou
# Modified: Norman Yee 
#           fix original cloudflare-blacklist.conf

# $Revision$
#

[Definition]

# Option:  actionstart
# Notes.:  command executed once at the start of Fail2Ban.
# Values:  CMD
#
actionstart =

# Option:  actionstop
# Notes.:  command executed once at the end of Fail2Ban
# Values:  CMD
#
actionstop =

# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck =

# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD
#
actionban = curl -s "https://www.cloudflare.com/api.html?a=ban&key=<ip>&u=<account>&tkn=<token>"

# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    <ip>  IP address
#          <failures>  number of failures
#          <time>  unix timestamp of the ban time
# Values:  CMD
#
actionunban = curl -s "https://www.cloudflare.com/api.html?a=nul&key=<ip>&u=<account>&tkn=<token>"

[Init]

# Option:  account
# Notes.:  In the actionban and actionunban sections,replace CLOUDFLARE_LOGIN with your CloudFlare login email
# Values:  your CloudFlare account
#
account = [email protected]

# Option:  token
# Notes.:  In the actionban and actionunban sections, replace CLOUDFLARE_API_TOKEN with your API key
# Values:  Your CloudFlare API key 
#
token = Your API key here

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