61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package middleware
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import (
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"crypto/subtle"
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"log"
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"net/http"
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"metazone.cc/mce/internal/config"
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"github.com/gin-gonic/gin"
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)
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const (
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csrfCookieName = "mlb_csrf"
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csrfHeaderName = "X-CSRF-Token"
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csrfMetaName = "csrf_token"
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)
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// CSRF 中间件：Double Submit Cookie 模式
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func CSRF(cfg *config.Config) gin.HandlerFunc {
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return func(c *gin.Context) {
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if c.Request.Method == http.MethodGet ||
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c.Request.Method == http.MethodHead ||
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c.Request.Method == http.MethodOptions {
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c.Next()
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return
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}
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cookieToken, err := c.Cookie(csrfCookieName)
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if err != nil || cookieToken == "" {
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c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
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"success": false, "message": "CSRF 验证失败",
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})
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return
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}
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headerToken := c.GetHeader(csrfHeaderName)
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if headerToken == "" {
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headerToken = c.PostForm(csrfMetaName)
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}
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if headerToken == "" {
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c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
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"success": false, "message": "CSRF 验证失败：缺少令牌",
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})
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return
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}
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if subtle.ConstantTimeCompare([]byte(cookieToken), []byte(headerToken)) != 1 {
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log.Printf("[CSRF] MISMATCH | path=%s | cookie_len=%d | header_len=%d",
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c.Request.URL.Path, len(cookieToken), len(headerToken))
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c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
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"success": false, "message": "CSRF 验证失败",
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})
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return
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}
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c.Set(csrfMetaName, cookieToken)
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c.Next()
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}
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}
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