增加用户验证防爆功能

server/handler/antiBruteForce.go

@@ -0,0 +1,130 @@
+package handler
+
+import (
+	"encoding/xml"
+	"io"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/bjdgyc/anylink/base"
+)
+
+// UserState 用于存储用户的登录状态
+type UserState struct {
+	FailureCount int
+	LastAttempt  time.Time
+	LockTime     time.Time
+}
+
+// 自定义 contextKey 类型，避免键冲突
+type contextKey string
+
+// 定义常量作为上下文的键
+const loginStatusKey contextKey = "login_status"
+
+// 用户状态映射
+var userStates = make(map[string]*UserState)
+var mu sync.Mutex
+
+func init() {
+	go cleanupUserStates()
+}
+
+// 清理过期的登录状态
+func cleanupUserStates() {
+	ticker := time.NewTicker(1 * time.Minute)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		mu.Lock()
+		now := time.Now()
+		for username, state := range userStates {
+			if now.Sub(state.LastAttempt) > time.Duration(base.Cfg.UserStateExpiration)*time.Second {
+				delete(userStates, username)
+			}
+		}
+		mu.Unlock()
+	}
+}
+
+// 防爆破中间件
+func antiBruteForce(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// 如果最大验证失败次数为0，则不启用防爆破功能
+		if base.Cfg.MaxBanCount == 0 {
+			return
+		}
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, "Failed to read request body", http.StatusBadRequest)
+			return
+		}
+		r.Body.Close()
+
+		cr := ClientRequest{}
+		err = xml.Unmarshal(body, &cr)
+		if err != nil {
+			http.Error(w, "Failed to parse XML", http.StatusBadRequest)
+			return
+		}
+
+		username := cr.Auth.Username
+
+		// 更新用户登录状态
+		mu.Lock()
+		state, exists := userStates[username]
+		if !exists {
+			state = &UserState{}
+			userStates[username] = state
+		}
+		// 检查是否已超过锁定时间
+		if !state.LockTime.IsZero() {
+			if time.Now().After(state.LockTime) {
+				// 如果已经超过了锁定时间，重置失败计数和锁定时间
+				state.FailureCount = 0
+				state.LockTime = time.Time{}
+			} else {
+				// 如果还在锁定时间内，返回错误信息
+				http.Error(w, "Account locked due to too many failed attempts. Try again later.", http.StatusTooManyRequests)
+				mu.Unlock()
+				return
+			}
+		}
+
+		// 如果超过时间窗口，重置失败计数
+		if time.Since(state.LastAttempt) > time.Duration(base.Cfg.BanResetTime)*time.Second {
+			state.FailureCount = 0
+		}
+
+		state.LastAttempt = time.Now()
+		mu.Unlock()
+
+		// 重新设置请求体以便后续处理器可以访问
+		r.Body = io.NopCloser(strings.NewReader(string(body)))
+
+		// 调用下一个处理器
+		next.ServeHTTP(w, r)
+
+		// 从 context 中获取登录状态
+		loginStatus, ok := r.Context().Value(loginStatusKey).(bool)
+		if !ok {
+			// 如果没有找到登录状态，默认为登录失败
+			loginStatus = false
+		}
+
+		// 更新用户登录状态
+		mu.Lock()
+		defer mu.Unlock()
+
+		if !loginStatus {
+			state.FailureCount++
+			if state.FailureCount >= base.Cfg.MaxBanCount {
+				state.LockTime = time.Now().Add(time.Duration(base.Cfg.LockTime) * time.Second)
+			}
+		} else {
+			state.FailureCount = 0 // 成功登录后重置
+		}
+	})
+}

server/handler/link_auth.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"bytes"
+	"context"
 	"crypto/md5"
 	"encoding/xml"
 	"fmt"
@@ -88,6 +89,7 @@ func LinkAuth(w http.ResponseWriter, r *http.Request) {
 	// TODO 用户密码校验
 	err = dbdata.CheckUser(cr.Auth.Username, cr.Auth.Password, cr.GroupSelect)
 	if err != nil {
+		r = r.WithContext(context.WithValue(r.Context(), loginStatusKey, false)) // 传递登录失败状态
 		base.Warn(err, r.RemoteAddr)
 		ua.Info = err.Error()
 		ua.Status = dbdata.UserAuthFail
@@ -101,6 +103,7 @@ func LinkAuth(w http.ResponseWriter, r *http.Request) {
 		tplRequest(tpl_request, w, data)
 		return
 	}
+	r = r.WithContext(context.WithValue(r.Context(), loginStatusKey, true)) // 传递登录成功状态
 	dbdata.UserActLogIns.Add(ua, userAgent)
 	// if !ok {
 	//	w.WriteHeader(http.StatusOK)

server/handler/server.go

@@ -111,7 +111,7 @@ func initRoute() http.Handler {
 	})
 
 	r.HandleFunc("/", LinkHome).Methods(http.MethodGet)
-	r.HandleFunc("/", LinkAuth).Methods(http.MethodPost)
+	r.Handle("/", antiBruteForce(http.HandlerFunc(LinkAuth))).Methods(http.MethodPost)
 	r.HandleFunc("/CSCOSSLC/tunnel", LinkTunnel).Methods(http.MethodConnect)
 	r.HandleFunc("/otp_qr", LinkOtpQr).Methods(http.MethodGet)
 	r.HandleFunc(fmt.Sprintf("/profile_%s.xml", base.Cfg.ProfileName), func(w http.ResponseWriter, r *http.Request) {