mirror of https://github.com/Safe3/uuWAF
parent
d79535e1b4
commit
9085a70807
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---
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---
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---
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--- 修订日期: 2024/12/20
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---
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local ngx = ngx
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local ngx_log = ngx.log
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local ngx_ERR = ngx.ERR
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local ngx_print = ngx.print
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local ngx_exit = ngx.exit
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local ngx_today = ngx.today
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local ngx_kv = ngx.shared
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local _M = {
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version = 1.7,
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name = "auth-plugin" -- 插件名称
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}
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-- 配置
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local valid_domains = {
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"test.com", -- 需要保护的域名列表
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"test1.cn"
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}
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local valid_username = "admin"
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local valid_password = "password123" -- 强密码建议修改
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local session_duration = 7200 -- 2小时,以秒为单位
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local max_login_attempts = 5 -- 最大登录失败次数
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-- 处理特殊字符函数,防止 HTML 注入
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local function escape_html(str)
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if not str then return "" end
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local replacements = {
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["&"] = "&",
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["<"] = "<",
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[">"] = ">",
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['"'] = """,
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["'"] = "'",
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}
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return (str:gsub("[&<>'\"]", function(c) return replacements[c] end))
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end
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-- 登录页面HTML模板,带错误提示信息
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local function get_login_page(req_uri, error_message)
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local escaped_error_message = escape_html(error_message or "")
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local form_action = escape_html(req_uri or "/")
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-- HTML部分拼接
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return [[
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>身份验证</title>
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<style>
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/* 通用样式保持简洁 */
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* {margin: 0; padding: 0; box-sizing: border-box;}
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body { min-height: 100vh; background: linear-gradient(120deg, #e0c3fc, #8ec5fc); display: flex; align-items: center; justify-content: center; font-family: -apple-system, BlinkMacSystemFont, sans-serif; }
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.glass { background: rgba(255, 255, 255, 0.25); backdrop-filter: blur(15px); border-radius: 30px; border: 1px solid rgba(255, 255, 255, 0.3); box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15); padding: 40px; width: 90%; max-width: 480px; text-align: center; position: relative; }
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h1 {color: #4a4a4a; font-size: 28px; font-weight: 600; margin-bottom: 15px;}
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.error-message {color: #d9534f; font-size: 14px; margin-bottom: 20px;}
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label {display: block; text-align: left; margin-bottom: 10px; font-weight: bold; color: #555;}
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input[type="text"], input[type="password"] {width: 100%; padding: 12px; margin-bottom: 20px; border-radius: 15px; border: 1px solid rgba(255, 255, 255, 0.4); font-size: 14px; background: rgba(255, 255, 255, 0.2); color: #555;}
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input[type="submit"] {background: linear-gradient(45deg, #6e8efb, #a777e3); color: white; padding: 12px 35px; border-radius: 25px; font-weight: 500; border: none; cursor: pointer; font-size: 16px; transition: transform 0.3s ease, box-shadow 0.3s ease;}
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input[type="submit"]:hover {transform: translateY(-2px); box-shadow: 0 5px 15px rgba(110, 142, 251, 0.4);}
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.note {color: #666; font-size: 12px; margin-top: 20px;}
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</style>
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</head>
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<body>
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<div class="glass">
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<h1>身份验证</h1>
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]] .. (escaped_error_message ~= "" and '<p class="error-message">' .. escaped_error_message .. '</p>' or "") .. [[
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<form method="POST" action="]] .. form_action .. [[">
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<label for="username">用户名</label>
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<input type="text" id="username" name="username" placeholder="输入用户名" required>
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<label for="password">密码</label>
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<input type="password" id="password" name="password" placeholder="输入密码" required>
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<input type="submit" value="登录">
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</form>
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<p class="note">您的访问受保护,请输入正确的账号密码。</p>
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</div>
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</body>
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</html>
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]]
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end
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-- 校验登录请求
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local function validate_login(waf)
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local form = waf.form["FORM"]
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if form then
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local username = form["username"]
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local password = form["password"]
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if username == valid_username and password == valid_password then
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return true
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end
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end
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return false
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end
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-- 请求阶段后过滤器
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function _M.req_post_filter(waf)
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local host = waf.host
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local req_uri = waf.reqUri
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local method = waf.method
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-- 检查域名是否受保护
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local is_protected = false
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for _, domain in ipairs(valid_domains) do
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if string.lower(host) == string.lower(domain) then
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is_protected = true
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break
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end
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end
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if not is_protected then
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return
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end
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-- 检查登录失败的次数
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local login_attempts_key = "login_attempts:" .. waf.ip .. ":" .. host
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local login_attempts = ngx_kv.ipCache and ngx_kv.ipCache:get(login_attempts_key) or 0
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if login_attempts >= max_login_attempts then
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-- 直接拦截超出登录尝试次数的请求
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ngx_kv.ipBlock:incr(waf.ip, 1, 0) -- 将IP拉入拦截列表
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waf.msg = "IP因登录失败次数过多已被拦截"
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waf.rule_id = 10001
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waf.deny = true
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return ngx_exit(403) -- 返回403 Forbidden
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end
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-- 校验会话是否已认证
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local session_key = "auth:" .. waf.ip .. ":" .. host -- 结合 IP 和 域名生成唯一会话
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local is_authenticated = ngx_kv.ipCache and ngx_kv.ipCache:get(session_key)
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if not is_authenticated then
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if method == "POST" then
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if validate_login(waf) then
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-- 登录成功:记录验证认证
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ngx_kv.ipCache:set(session_key, true, session_duration)
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ngx_kv.ipCache:delete(login_attempts_key) -- 重置失败次数
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return
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else
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-- 登录失败:记录失败次数
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login_attempts = login_attempts + 1
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ngx_kv.ipCache:set(login_attempts_key, login_attempts, 3600) -- 失败次数保存1小时
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-- 可选:输出登录失败提示(直接返回页面避免请求到原站)
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local error_message = "用户名或密码错误,请重试。"
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ngx.header.content_type = "text/html; charset=utf-8"
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return ngx.print(get_login_page(req_uri, error_message)) -- 使用直接返回页面
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end
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else
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-- 显示登录页面
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ngx.header.content_type = "text/html; charset=utf-8"
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return ngx.print(get_login_page(req_uri, nil)) -- 使用直接返回页面
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end
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end
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-- 已经认证,继续处理后续请求
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end
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return _M
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@ -0,0 +1,39 @@
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--[[
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规则名称: 防止爆破登录
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过滤阶段: 请求阶段
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危险等级: 高危
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规则描述: 针对路径中包含登录、注册等关键词的URL特征,如果5分钟(300秒)内请求次数超过10次,则封禁该IP 1440分钟(24小时)
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--]]
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local sh = waf.ipCache
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local bruteForceKey = 'brute-force-login:' .. waf.ip -- 使用独立前缀标识,避免与其他规则冲突
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-- 定义特征路径关键词列表
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local targetPaths = { "login", "signin", "signup", "register", "reset", "passwd", "account", "user" }
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-- 判断URI是否包含特征关键词
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if not waf.pmMatch(waf.toLower(waf.uri), targetPaths) then
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return false -- 如果路径中不包含任何特征关键词,则跳过检测
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end
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-- 获取缓存中的数据
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local requestCount, flag = sh:get(bruteForceKey)
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if not requestCount then
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-- 初始化计数,设置5分钟(300秒)的时间窗口
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sh:set(bruteForceKey, 1, 300, 1)
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else
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-- 如果标志已经为2,则IP处于封禁状态,直接拦截
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if flag == 2 then
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return waf.block(true) -- 阻断请求,返回403响应
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end
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-- 增加非法请求次数
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sh:incr(bruteForceKey, 1)
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if requestCount + 1 > 10 then
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-- 达到爆破攻击检测阈值,标记为封禁状态,封禁时间为1440分钟(24小时)
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sh:set(bruteForceKey, requestCount + 1, 86400, 2)
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return true, "检测到登录接口发生爆破攻击,已封禁IP", true -- 日志载荷改为中文
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end
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end
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return false
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@ -0,0 +1,28 @@
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--[[
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规则名称: 频繁触发攻击拦截的IP拉黑
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过滤阶段: 请求阶段
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危险等级: 高危
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规则描述: 检查当前请求的客户端IP是否在最近10分钟内频繁触发(超过30次)WAF的拦截,如果是,则拉黑IP 1440分钟,并记录日志。
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注意: 因为南墙WAF特性,此规则生效对规则ID有要求,需要将此规则与南墙自带规则的第一个规则交换位置才能生效。
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]]
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local sh = waf.ipCache -- 键值存储库,用于存储拉黑状态
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local ip_stats = waf.ipBlock -- 查询最近被南墙拦截的IP统计,如社区版本默认存储时间为10分钟
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local ip = waf.ip
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local block_key = "blocked-" .. ip -- 用于记录IP拉黑状态的key
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-- 如果IP已经被拉黑则直接拦截
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local c, f = sh:get(block_key)
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if c and f == 2 then
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return waf.block(true) -- 重置TCP连接,不返回任何内容
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end
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-- 检查该IP在最近时间内是否频繁被拦截
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local recent_count = ip_stats:get(ip)
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if recent_count and recent_count > 30 then
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-- 如果超过30次,则拉黑IP,设置1440分钟(24小时)
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sh:set(block_key, 1, 86400, 2) -- 第三个参数86400为1440分钟(单位为秒),第四个参数2表示拉黑状态
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return true, "IP频繁触发拦截,已被拉黑", true -- 记录日志并拦截
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end
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return false
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--[[
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规则名称: 高频错误防护
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过滤阶段: 返回HTTP头阶段
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危险等级: 中危
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规则描述: 监测频繁返回40x、50x错误,当60秒内出现这些错误10次以上,则封禁1440分钟。
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--]]
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local function isCommonError(status)
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-- 检查是否为40x或50x错误
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return status >= 400 and status < 600
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end
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-- 配置参数
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local threshold = 10 -- 错误次数阈值
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local timeWindow = 60 -- 时间窗口,单位为秒
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local banDuration = 1440 * 60 -- 封禁时间,1440分钟 = 86400秒
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-- 获取客户端IP
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local ip = waf.ip
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-- 获取返回的HTTP状态码
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local status = waf.status
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-- 检查当前请求是否是40x或者50x错误,不是则直接返回false
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if not isCommonError(status) then
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return false
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end
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-- 使用 waf.ipCache 记录当前 IP 的错误次数
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local errorCache = waf.ipCache
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local errorKey = "error:" .. ip -- 定义记录错误次数的键值,以 IP 为基础区分
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local errorCount, flag = errorCache:get(errorKey)
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-- 若当前记录不存在,初始化记录
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if not errorCount then
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errorCache:set(errorKey, 1, timeWindow) -- 初始错误计数设置为1,并设置为60秒过期
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else
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if flag == 2 then
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-- 标志为2表示该IP已被封禁,直接拦截,即刻终止
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return waf.block(true)
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end
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-- 累加错误计数
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errorCache:incr(errorKey, 1)
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if errorCount + 1 >= threshold then
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-- 达到错误频率阈值,标记当前IP为封禁状态
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errorCache:set(errorKey, errorCount + 1, banDuration, 2)
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return true, "高频错误触发,IP已被封禁", true
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end
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end
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return false
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@ -0,0 +1,94 @@
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--[[
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规则名称: 站点维护模式
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过滤阶段: 请求阶段
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危险等级: 低危
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规则描述: 将站点置为维护模式,返回“网页正在维护”的自定义页面。
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--]]
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-- 检查是否启用维护模式的条件(可以根据需求自定义,以下为示例)
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local maintenance_mode = true -- 可以通过配置文件或其他方式动态控制
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if maintenance_mode then
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-- 设置自定义的维护页面 HTML 内容
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local maintenance_html = [[<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>网页正在维护</title>
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<style>
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* {margin: 0; padding: 0; box-sizing: border-box;}
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body {
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min-height: 100vh;
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background: linear-gradient(120deg, #e0c3fc, #8ec5fc);
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display: flex;
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align-items: center;
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justify-content: center;
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font-family: -apple-system, BlinkMacSystemFont, sans-serif;
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}
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.glass {
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background: rgba(255, 255, 255, 0.25);
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backdrop-filter: blur(15px);
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border-radius: 30px;
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border: 1px solid rgba(255, 255, 255, 0.3);
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box-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
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padding: 40px;
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width: 90%;
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max-width: 480px;
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text-align: center;
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position: relative;
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}
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.icon {
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width: 80px;
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height: 80px;
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margin: 0 auto 20px;
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}
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h1 {
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color: #4a4a4a;
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font-size: 28px;
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font-weight: 600;
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margin-bottom: 15px;
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}
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.message {
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color: #666;
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font-size: 16px;
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line-height: 1.6;
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margin: 15px 0;
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}
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.provider {
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color: #666;
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font-size: 12px;
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position: absolute;
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bottom: -30px;
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left: 0;
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right: 0;
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text-align: center;
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}
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.provider strong {
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color: #5856d6;
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}
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</style>
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</head>
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<body>
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<div class="glass">
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<div class="icon">
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<svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
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<path d="M12 22c5.5-4 8-8 8-12V5l-8-3-8 3v5c0 4 2.5 8 8 12z" stroke="#6e8efb" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"/>
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<path d="M9 12l2 2 4-4" stroke="#a777e3" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
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</svg>
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</div>
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<h1>网页正在维护</h1>
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<p class="message">抱歉,当前网页正在维护中,请稍后访问。</p>
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<div class="provider">维护通知由 <strong>南墙 WAF</strong> 提供</div>
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</div>
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</body>
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</html>]]
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ngx.header.content_type = "text/html; charset=utf-8"
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-- 输出维护页面并终止请求处理
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ngx.print(maintenance_html)
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return ngx.exit(ngx.HTTP_OK) -- 使用 ngx.HTTP_OK 结束请求,避免传递到源站
|
||||
end
|
||||
|
||||
return false -- 未启用维护模式,不拦截请求
|
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Reference in New Issue