MSI可以使用EF CodeFirst吗?

时间:2018-04-27 02:49:15

标签: ef-code-first ef-migrations azure-msi

我已经坚持了很长一段时间了,没有运气我自己推进。

我正在尝试使用MSI令牌从Azure App Service连接到EF CodeFirst托管数据库。

当我使用ARM部署App Service时,我生成了一个Output,确保它创建了一个Service Principal:

 {
  "principalId":"98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx","
  tenantId":"e6d2d4cc-b762-486e-8894-4f5f440dxxxx",
  "type":"SystemAssigned"
 }

在Kudu中,环境变量显示它正在安装:

MSI_ENDPOINT = http://127.0.0.1:41239/MSI/token/
MSI_SECRET = 7C1B16Fxxxxxxxxxxxxx

我在Azure门户中提供了一个连接字符串,如下所示:

Data Source=nzmoebase0000bt.database.windows.net;Initial Catalog=nzmoebase0001bt;Connect Timeout=300;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=300;

我已将主体作为所有者添加到数据库中。

Note: I cannot do the same for the master db.

令牌被添加到DbContext中,如下所示:

使用以下方式添加令牌:

    static async Task AttachAccessTokenToDbConnection(IDbConnection dbConnection)
    {
        SqlConnection sqlConnection = dbConnection as SqlConnection;
        if (sqlConnection == null)
        {
            return;
        }
        string msiEndpoint = Environment.GetEnvironmentVariable("MSI_ENDPOINT");
        if (string.IsNullOrEmpty(msiEndpoint))
        {
            return;
        }

        var msiSecret = Environment.GetEnvironmentVariable("MSI_SECRET");
        if (string.IsNullOrEmpty(msiSecret))
        {
            return;
        }

        // To get around:
        // "Cannot set the AccessToken property if 'UserID', 'UID', 'Password', or 'PWD' has been specified in connection string."
        var terms = new[] {"UserID","Password","PWD=","UID=" };
        string connectionString = dbConnection.ConnectionString;

        foreach (var term in terms)
        {
            if (connectionString.Contains(term, StringComparison.InvariantCultureIgnoreCase))
            {
                return;
            }
        }

        string accessToken = await AppCoreDbContextMSITokenFactory.GetAzureSqlResourceTokenAsync();
        sqlConnection.AccessToken = accessToken;
    }

通过跟踪,令牌为:

 .eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI....

使用jwt.io解码的是:

{
  "typ": "JWT",
  "alg": "RS256",
  "x5t": "FSimuFrFNoC0sJXGmv13nNZceDc",
  "kid": "FSimuFrFNoC0sJXGmv13nNZceDc"
}.{
  "aud": "https://database.windows.net/",
  "iss": "https://sts.windows.net/e6d2d4cc-b762-486e-8894-4f5f440dxxxx/",
  "iat": 1522783025,
  "nbf": 1522783025,
  "exp": 1522786925,
  "aio": "Y2NgYPjNdyJd9zrzpLavJSEzNIuPAAA=",
  "appid": "d1057cea-461b-4946-89a9-d76439c2xxxx",
  "appidacr": "2",
  "e_exp": 262800,
  "idp": "https://sts.windows.net/e6d2d4cc-b762-486e-8894-4f5f440dxxxx/",
  "oid": "98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx",
  "sub": "98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx",
  "tid": "e6d2d4cc-b762-486e-8894-4f5f440dxxxx",
  "uti": "59bqKWiSL0Gf0bTCI0AAAA",
  "ver": "1.0"
}.[Signature]

我根据网上的几项建议添加了Persist Security Info = True,但这没有任何可检测性。

Data Source=nzmoebase0000bt.database.windows.net;Initial Catalog=nzmoebase0001bt;MultipleActiveResultSets=False;Persist Security Info = True;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;

我得到的错误是:

[InvalidOperationException: This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection.]

是否有人使用CodeFirst,迁移和MSI连接到数据库?在这一点上,经过几个星期的真正卡住,我开始怀疑是否有可能。

感谢您的帮助 - 即使只是证明它可以起作用,对于初学者来说。

2 个答案:

答案 0 :(得分:0)

不幸的是,据我所知,没有。项目的主要绊脚石,必须转而使用不安全的用户名/密码加载的连接字符串。

答案 1 :(得分:0)

您可以像这样在sql连接上设置访问令牌:

  1. 安装Microsoft.Azure.Services.AppAuthentication nuget程序包
  2. 像这样设置上下文类:

    public class MyDatabaseContext : DbContext
    {
        public MyDatabaseContext(DbContextOptions<MyDatabaseContext> options)
            : base(options)
        {
            // Get the db connection
            var connection = (SqlConnection)Database.GetDbConnection();
    
            // Add the access token
            connection.AccessToken = new AzureServiceTokenProvider()
                .GetAccessTokenAsync("https://database.windows.net/")
                .ConfigureAwait(false).GetAwaiter().GetResult();
        }
    
        public DbSet<MyTable> MyTable { get; set; }
    }