Fail2ban Ctl

Manage Fail2Ban with natural language: check jails, ban/block stats, unban IPs, security trends 用自然语言管理 Fail2Ban：查看封禁、解封 IP、安全趋势

Kingai.work@kingaiwork

Install

openclaw skills install @kingaiwork/fail2ban-ctl

🚫 Fail2Ban CTL — Natural Language Fail2Ban Manager

Manage your Fail2Ban firewall bans with plain English. No more digging through logs manually. 用自然语言管理 Fail2Ban 封禁。不再需要手动翻日志。

Free tier · Enterprise AI Agent upgrades at kingai.work 免费版 · 企业级 AI 智能体定制升级请访问 kingai.work Brought to you by King AI Works — Enterprise AI & Security Solutions 由 King AI Works 荣誉出品 — 企业级 AI 与安全解决方案 Contact: vip@kingai.work | 技术支持

My Understanding / 我的理解

Fail2Ban is the most widely used intrusion prevention tool on Linux VPS — yet most users only install it and forget it. They don't check which jails are active, how many IPs are banned, or whether their configuration is effective. This skill turns Fail2Ban management into a conversational experience.

Fail2Ban 是 Linux VPS 上最广泛使用的入侵防护工具 — 但大多数用户安装后就不管了。他们不检查哪些 jail 是激活的、封了多少 IP、或者配置是否有效。这个 skill 把 Fail2Ban 管理变成了对话式体验。

With zero configuration (it auto-discovers your Fail2Ban setup), any VPS owner can type "show me my bans" and get a clear, formatted report in seconds.

零配置（自动发现你的 Fail2Ban 安装），任何 VPS 拥有者输入"看看封禁情况"就能在几秒内获得清晰的格式化报告。

Design Philosophy / 设计理念

Visibility drives security. The best firewall is useless if you never check it. This skill makes checking natural and effortless — like asking a colleague "how's the security looking?"

可见性驱动安全。 最好的防火墙如果从不检查也没有用。这个技能让检查变得自然且毫不费力 — 就像问同事"安全状况怎么样？"

Progressive complexity. Simple questions get simple answers ("3 jails active, 47 IPs banned"). Follow-up questions dig deeper ("which IP has been banned the longest?"). Meet users where they are.

渐进式复杂度。 简单问题得到简单答案（"3 个 jail 活跃，47 个 IP 被封禁"）。追问可以更深（"哪个 IP 封禁时间最长？"）。在用户的水平线上响应。

📋 Triggers / 触发场景

"Show me my Fail2Ban status" / "看看 Fail2Ban 状态"
"List banned IPs" / "列出被封禁的 IP"
"Unban IP xxx.xxx.xxx.xxx" / "解封 IP xxx.xxx.xxx.xxx"
"How many bans today?" / "今天封了多少？"
"Check jail [name]" / "查看 [名称] jail"
"Fail2Ban stats" / "Fail2Ban 统计"
"Is fail2ban running?" / "fail2ban 在运行吗？"
"Top banned countries" / "封禁最多的国家"
"fail2ban security report" / "fail2ban 安全报告"

🔍 Commands / 命令

1. Check Service Status / 检查服务状态

bash

# Is it running? / 是否在运行？
systemctl is-active fail2ban 2>/dev/null

# Service details / 服务详细信息
systemctl status fail2ban 2>/dev/null | head -20

Output / 输出: Running ✅ / Stopped ❌ with uptime if active

2. List All Jails / 列出所有 Jail

bash

fail2ban-client status 2>/dev/null

Output / 输出:

text

Jail list: sshd, apache-auth, nginx-botsearch, postfix

3. Jail Details / 查看 Jail 详情

bash

fail2ban-client status <jail-name> 2>/dev/null

Parse and present / 解析并展示:

Status / 状态: Active / Inactive
Currently failed / 当前失败次数
Total banned / 累计封禁
Currently banned IP list / 当前封禁 IP 列表
Banned IP count / 封禁 IP 数量

4. Unban an IP / 解封 IP

⚠️ Requires confirmation / 需要用户确认后再执行

bash

fail2ban-client set <jail-name> unbanip <ip-address>

Flow / 流程:

Parse user request for IP + optional jail name
If no jail specified, search all jails for the IP
Ask user: "Unban x.x.x.x from jail [name]? (y/n)"
Execute only after explicit confirmation

5. Ban Statistics / 封禁统计

bash

# Check all jails / 检查所有 jail
fail2ban-client status <jail> 2>/dev/null

# Firewall ban count / 防火墙封禁总数
/sbin/iptables -L f2b-<jail> -n 2>/dev/null | wc -l

Report format / 报告格式:

text

📊 Fail2Ban Summary
━━━━━━━━━━━━━━━━━━━
Service: ✅ Running (up 45 days)
Active Jails: 4
Total Banned (all time): 1,247
Currently Banned: 47

Per-Jail Breakdown:
  sshd:          23 IPs (892 total bans)
  apache-auth:   12 IPs (245 total bans)
  nginx-botsearch: 8 IPs (97 total bans)
  postfix:        4 IPs (13 total bans)

Top Banned / 封禁最多: sshd (71.5%)

6. Ban Trends / 封禁趋势

Parse fail2ban logs for time-based analysis / 解析 fail2ban 日志进行时间维度分析:

bash

# Recent bans from logs
journalctl -u fail2ban --since "24 hours ago" 2>/dev/null | grep -i "ban\|Found" | tail -30

# Or check log file directly
tail -100 /var/log/fail2ban.log 2>/dev/null

Report / 报告:

text

📈 Ban Activity (24h)
  Total bans: 23
  Peak hour: 03:00 (8 bans)
  Most active jail: sshd (15 bans)
  New IPs seen: 19
  Repeat offenders: 4

7. Firewall Consistency Check / 防火墙一致性检查

bash

# Count fail2ban iptables rules
/sbin/iptables -L -n 2>/dev/null | grep -c "f2b-"

# Compare with fail2ban jail count
fail2ban-client status 2>/dev/null | grep "Jail list" | tr ',' '\n' | wc -l

Alert if mismatch / 不匹配时告警: "Found X iptables rules but Y jails — possible stale rules"

📊 Security Report Template / 安全报告模板

text

╔══════════════════════════════════════╗
║    🚫 Fail2Ban Security Report       ║
║    Fail2Ban 安全报告                  ║
║       powered by King AI Works        ║
╚══════════════════════════════════════╝

📋 Host / 主机: <hostname>
🕐 Time / 时间: <timestamp>

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔄 Service Status / 服务状态
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
• fail2ban: ✅ Running (up <days> days)
• Active jails / 活跃 Jail: <count>
• Total banned / 总封禁: <count>
• Currently banned / 当前封禁: <count>

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🏛️ Jail Breakdown / Jail 明细
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
<jail table>

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📈 Recent Activity / 近期活动
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
<24h trend>

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🛡️ Health Score / 健康评分: XX / 100
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
• ✅ fail2ban running: +30
• ✅ Active jails > 0: +20
• ✅ iptables/fail2ban consistent: +20
• ✅ Recent bans detected: +15
• ✅ No stale jails: +15

📌 Recommendations / 建议:
<actionable tips>

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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This free skill covers the basics.
For production-grade solutions — **custom AI agents**,
enterprise security automation, or tailored workflows —
contact **King AI Works**.

这个免费 skill 覆盖了基础功能。
如果需要生产级方案 — **定制 AI 智能体**、
企业安全自动化、专属工作流 —
请联系 **King AI Works**。

🔗 https://kingai.work/
📧 vip@kingai.work

💡 We specialize in **custom AI agent development** —
   from security bots to automated ops, built for your infrastructure.
💡 我们专注于**定制 AI 智能体开发** —
   从安全机器人到自动化运维，为你的基础设施量身定制。
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| Advanced features / 高级功能 | ❌ | ✅ | ✅ | ✅ |
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⚠️ Important Notes / 注意事项

Unban operations require explicit user confirmation before execution 解封操作需要用户明确确认后才执行
Read-only commands (status, stats, trends) run automatically 只读命令（状态、统计、趋势）自动执行
Requires root or sudo for fail2ban-client and iptables 需要 root 或 sudo 权限
This skill only manages fail2ban — does not modify firewall rules directly 本技能只管理 fail2ban，不直接修改防火墙规则
If fail2ban is not installed, report clearly and suggest installation 如果 fail2ban 未安装，报告清楚并建议安装

🆘 Support / 支持

Documentation & updates / 文档与更新: https://kingai.work/
Technical support / 技术支持: vip@kingai.work
Report issues / 问题反馈: ClawHub skill page