// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
package waf
import (
"crypto/md5"
"fmt"
"github.com/TeaOSLab/EdgeCommon/pkg/nodeconfigs"
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/firewallconfigs"
"github.com/TeaOSLab/EdgeNode/internal/utils/counters"
"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
"github.com/iwind/TeaGo/types"
"net/http"
"strings"
"time"
)
type JSCookieAction struct {
BaseAction
Life int32 `yaml:"life" json:"life"`
MaxFails int `yaml:"maxFails" json:"maxFails"` // 最大失败次数
FailBlockTimeout int `yaml:"failBlockTimeout" json:"failBlockTimeout"` // 失败拦截时间
Scope string `yaml:"scope" json:"scope"`
FailBlockScopeAll bool `yaml:"failBlockScopeAll" json:"failBlockScopeAll"`
}
func (this *JSCookieAction) Init(waf *WAF) error {
if waf.DefaultJSCookieAction != nil {
if this.Life <= 0 {
this.Life = waf.DefaultJSCookieAction.Life
}
if this.MaxFails <= 0 {
this.MaxFails = waf.DefaultJSCookieAction.MaxFails
}
if this.FailBlockTimeout <= 0 {
this.FailBlockTimeout = waf.DefaultJSCookieAction.FailBlockTimeout
}
if len(this.Scope) == 0 {
this.Scope = waf.DefaultJSCookieAction.Scope
}
this.FailBlockScopeAll = waf.DefaultJSCookieAction.FailBlockScopeAll
}
if len(this.Scope) == 0 {
this.Scope = firewallconfigs.FirewallScopeGlobal
}
return nil
}
func (this *JSCookieAction) Code() string {
return ActionJavascriptCookie
}
func (this *JSCookieAction) IsAttack() bool {
return false
}
func (this *JSCookieAction) WillChange() bool {
return true
}
func (this *JSCookieAction) Perform(waf *WAF, group *RuleGroup, set *RuleSet, req requests.Request, writer http.ResponseWriter) PerformResult {
// 是否在白名单中
if SharedIPWhiteList.Contains("set:"+types.String(set.Id), this.Scope, req.WAFServerId(), req.WAFRemoteIP()) {
return PerformResult{
ContinueRequest: true,
}
}
nodeConfig, err := nodeconfigs.SharedNodeConfig()
if err != nil {
return PerformResult{
ContinueRequest: true,
}
}
var life = this.Life
if life <= 0 {
life = 3600
}
// 检查Cookie
var cookieName = "ge_js_validator_" + types.String(set.Id)
cookie, err := req.WAFRaw().Cookie(cookieName)
if err == nil && cookie != nil {
var cookieValue = cookie.Value
if len(cookieValue) > 10 {
var pieces = strings.Split(cookieValue, "@")
if len(pieces) == 3 {
var timestamp = pieces[0]
var sum = pieces[2]
if types.Int64(timestamp) >= time.Now().Unix()-int64(life) && fmt.Sprintf("%x", md5.Sum([]byte(timestamp+"@"+types.String(set.Id)+"@"+nodeConfig.NodeId))) == sum {
return PerformResult{
ContinueRequest: true,
}
}
}
}
}
req.ProcessResponseHeaders(writer.Header(), http.StatusOK)
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
writer.Header().Set("Cache-Control", "no-cache")
var timestamp = types.String(time.Now().Unix())
var cookieValue = timestamp + "@" + types.String(set.Id) + "@" + fmt.Sprintf("%x", md5.Sum([]byte(timestamp+"@"+types.String(set.Id)+"@"+nodeConfig.NodeId)))
var respHTML = `
`
writer.Header().Set("Content-Length", types.String(len(respHTML)))
writer.WriteHeader(http.StatusOK)
_, _ = writer.Write([]byte(respHTML))
// 记录失败次数
this.increaseFails(req, waf.Id, group.Id, set.Id, waf.UseLocalFirewall && (this.FailBlockScopeAll || this.Scope == firewallconfigs.FirewallScopeGlobal))
return PerformResult{}
}
func (this *JSCookieAction) increaseFails(req requests.Request, policyId int64, groupId int64, setId int64, useLocalFirewall bool) (goNext bool) {
var maxFails = this.MaxFails
var failBlockTimeout = this.FailBlockTimeout
if maxFails <= 0 {
maxFails = 10 // 默认10次
} else if maxFails <= 5 {
maxFails = 5 // 不能小于3，防止意外刷新出现
}
if failBlockTimeout <= 0 {
failBlockTimeout = 1800 // 默认1800s
}
var key = "WAF:JS_COOKIE:FAILS:" + req.WAFRemoteIP() + ":" + types.String(req.WAFServerId()) + ":" + req.WAFRaw().URL.String()
var countFails = counters.SharedCounter.IncreaseKey(key, 300)
if int(countFails) >= maxFails {
SharedIPBlackList.RecordIP(IPTypeAll, firewallconfigs.FirewallScopeServer, req.WAFServerId(), req.WAFRemoteIP(), time.Now().Unix()+int64(failBlockTimeout), policyId, useLocalFirewall, groupId, setId, "JS_COOKIE验证连续失败超过"+types.String(maxFails)+"次")
return false
}
return true
}