使用共享密钥授权访问Blob资源

时间:2019-02-06 11:55:46

标签: c# azure azure-storage

我试图使用邮递员通过共享密钥读取存储在Microsoft Azure Blob存储中的图像文件,这给了我以下错误。

<?xml version="1.0" encoding="utf-8"?>
<Error>
    <Code>AuthenticationFailed</Code>
    <Message>Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
RequestId:48328e8c-601e-000a-3508-bec540000000
Time:2019-02-06T10:43:06.4920228Z</Message>
    <AuthenticationErrorDetail>The MAC signature found in the HTTP request 'jn37EV4KPWj3wQANreUQy8ih+H5rFOp0fqj1DebgBMk=' is not the same as any computed signature. Server used following string to sign: 'GET




image/jpeg






x-ms-date:Wed, 06 Feb 2019 10:38:54 GMT
x-ms-version:2018-03-28
/<accountName>/<containerFolder>/<image.jpg>'.</AuthenticationErrorDetail>
</Error>

我用来计算签名的代码是:

class Program
    {
        private static string storageAccountKey = "<account_key>";

        static void Main(string[] args)
        {
            string utcDate = DateTime.UtcNow.ToString("R", CultureInfo.InvariantCulture);
            string authStr = "GET\n\n\n\n\n\n\n\n\n\n\n\n\nx-ms-date:" + utcDate + "\nx-ms-version:2018-03-28\n/<account_name>/<container_name>/<image.jpeg>";
            string hash = CreateAuthorizationHeader(authStr);
            Console.WriteLine(hash);
            Console.ReadKey(true);
        }

        public static String CreateAuthorizationHeader(String canonicalizedString)
        {
            String signature = String.Empty;

            using (HMACSHA256 hmacSha256 = new HMACSHA256(Convert.FromBase64String(storageAccountKey)))
            {
                Byte[] dataToHmac = System.Text.Encoding.UTF8.GetBytes(canonicalizedString);
                signature = Convert.ToBase64String(hmacSha256.ComputeHash(dataToHmac));
            }

            String authorizationHeader = String.Format(
                CultureInfo.InvariantCulture,
                "{0} {1}:{2}",
                AzureStorageConstants.SharedKeyAuthorizationScheme,
                AzureStorageConstants.Account,
                signature
            );

            return authorizationHeader;
        }
    }

    class AzureStorageConstants
    {
        public static string SharedKeyAuthorizationScheme = "SharedKey";

        public static string Account = "<account_name>";
    }

我要传递的标头是:

  1. 内容类型:图片/ jpeg
  2. 授权:SharedKey帐户名:jn37EV4KPWj3wQANreUQy8ih + H5rFOp0fqj1DebgBMk =
  3. x-ms-version:2018-03-28
  4. x-ms-date:2019年2月6日,星期三10:38:54 GMT

我在 CreateAuthorizationHeader(String canonicalizedString)中有断点,然后复制 utcDate Signature 的值并将其传递给标题。我要去哪里错了??

1 个答案:

答案 0 :(得分:0)

出现此错误的原因是因为您将content-type作为请求标头之一传递,但是在计算canonicalizedString时却没有包括它。

您可以做两件事:

  1. 从您的请求标头中删除content-type:由于您正在获取Blob的内容,因此您实际上不需要此标头。删除该代码后,代码应该可以正常工作。
  2. content-type计算中包含image/jpeg标头(canonicalizedString)的值:因此您的代码应为:

string authStr = "GET\n\n\n\n\n\n\n\n\n\n\n\nimage/jpeg\nx-ms-date:" + utcDate + "\nx-ms-version:2018-03-28\n/<account_name>/<container_name>/<image.jpeg>";