【Gin-API系列】Gin中间件之鉴权访问（五）

在完成中间件的介绍和日志中间件的代码后，我们的程序已经基本能正常跑通了，但如果要上生产，还少了一些必要的功能，例如鉴权、异常捕捉等。本章我们介绍如何编写鉴权中间件。

鉴权访问，说白了就是给用户的请求增加一些限制条件，过滤掉不符合要求的请求。完善的鉴权模块可以让我们的服务跑得更加安全，特别是面向公共的服务。

常用的无状态鉴权方式 网络鉴权 通常有IP白名单方式，通过获取客户端的真实IP来对请求进行过滤

用户鉴权 通过账号密码或者分配的密钥、Token等方式进行认证，常用的cookies、oauth2.0都是这种方式

加密算法鉴权 客户端使用加密算法对用户的参数进行计算加密得到Token，并将参数和Token一起发送；服务端使用同样的加密算法对请求参数进行加密后比较Token的值是否一致。

Gin-IPs 鉴权访问 为了让我们的服务更加安全，我们通常是混合多种鉴权方式使用。本文采取“用户鉴权”和“加密算法鉴权”混合方式。

鉴权算法介绍 通过某种方式生成或者手动指定分配公钥和私钥对给用户，用户使用公钥和请求参数组成消息内容，使用私钥对消息内容进行哈希计算，得到固定长度的字符串。 服务器使用同样的方式对用户请求的参数进行哈希计算后比较。由于这里面的算法和密钥对都是私有的，所以安全性较高，适用于大多数场景。

加密代码 // 签名算法如下 /* Signature = HMAC-SHA1(‘SecretKey’, UTF-8-Encoding-Of( StringToSign ) ) ); StringToSign = method + “\n” + URL + “\n” + Sort-UrlParams + “\n” + Content-MD5 + “\n” + // md5(params) Expires + “\n” + AccessKey; */ func genSignature(accessKey, secretKey, uri, method, urlParams, params, nowTS string) (string, error) { if params != “” { md5Ctx := md5.New() _, _ = io.WriteString(md5Ctx, params) params = fmt.Sprintf("%x", md5Ctx.Sum(nil)) }

strSign := method + "\n" + uri + "\n" + urlParams + "\n" + params + "\n" + nowTS + "\n" + accessKey sign := hmacSHA1Encrypt(strSign, secretKey) return sign, nil

}

// hmacSHA1Encrypt encrypt the encryptText use encryptKey func hmacSHA1Encrypt(encryptText, encryptKey string) string { key := []byte(encryptKey) mac := hmac.New(sha1.New, key) mac.Write([]byte(encryptText)) var str = hex.EncodeToString(mac.Sum(nil)) return str } Gin鉴权中间件使用 func Validate() gin.HandlerFunc { return func(c *gin.Context) { response := route_response.Response{} response.Data.List = []interface{}{} // 初始化为空切片，而不是空引用 traceId := SnowWorker.GetId() c.Writer.Header().Set(“X-Request-Trace-Id”, traceId)

uri := c.Request.URL.Path // remoteAddr := c.ClientIP() // 也可以对客户端IP进行限制 contentType := c.Request.Header.Get("Content-Type") if contentType != "application/json" { c.Abort() response.Code, response.Message = configure.RequestParameterTypeError, "Content-Type 类型只支持 application/json" c.JSON(http.StatusUnauthorized, response) return } accessKey := c.DefaultQuery("accesskey", "") expires := c.DefaultQuery("expires", "") signature := c.DefaultQuery("signature", "") if accessKey == "" { c.Abort() response.Code, response.Message = configure.RequestParameterMiss, "Token缺失" c.JSON(http.StatusUnauthorized, response) return } secret, err := dao.FetchSecret(accessKey) if err != nil || "valid" != secret.State { c.Abort() response.Code, response.Message = configure.RequestKeyNotFound, "无效的Token" c.JSON(http.StatusUnauthorized, response) return } c.Writer.Header().Set("X-Request-User", secret.User) if expires == "" { c.Abort() response.Code, response.Message = configure.RequestParameterMiss, "有效期参数缺失" c.JSON(http.StatusUnauthorized, response) return } if signature == "" { c.Abort() response.Code, response.Message = configure.RequestParameterMiss, "签名缺失" c.JSON(http.StatusUnauthorized, response) return } secretKey := secret.SecretKey if nowTs, err := strconv.ParseInt(expires, 10, 64); err != nil { c.Abort() response.Code, response.Message = configure.RequestParameterTypeError, "有效期参数类型错误" c.JSON(http.StatusUnauthorized, response) return } else { passTime := time.Now().Unix() - nowTs if passTime < 0 || passTime >= configure.GinConfigValue.Expires { // 容错时间越大越容易被攻击，服务器时间必须准 c.Abort() response.Code, response.Message = configure.RequestExpired, "请求已过期" c.JSON(http.StatusUnauthorized, response) return } } method := strings.ToUpper(c.Request.Method) http://bbs.quyouji.com/topic.asp?id=2261

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var urlParams, params string if "POST" == method || "PUT" == method { body, _ := ioutil.ReadAll(c.Request.Body) c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(body)) // 重设body params = string(body) } else if "GET" == method || "DELETE" == method { queryParams := c.Request.URL.Query() allParams := make(map[string]string) for k, v := range queryParams { if k != "accesskey" && k != "expires" && k != "signature" { allParams[k] = v[0] // 如果某个key传入了2个，只用第一个的值 } } keys := getMapKeysSorted(allParams) for _, k := range keys { urlParams += k + allParams[k] } } if signatureString, err := genSignature(accessKey, secretKey, uri, method, urlParams, params, expires); err != nil { c.Abort() response.Code, response.Message = configure.ApiGenSignatureError, "API内部错误" c.JSON(http.StatusUnauthorized, response) return } else { if signature != signatureString { c.Abort() response.Code, response.Message = configure.RequestAuthorizedFailed, "API认证失败" c.JSON(http.StatusUnauthorized, response) return } } c.Next() }

}

本文关于鉴权访问的介绍和使用到此为止，下一章我们将使用异常捕捉中间件来完善我们的程序。