3

我已经坚持了很长一段时间,没有运气自己推进它。

我正在尝试使用 MSI 令牌从 Azure 应用服务连接到 EF CodeFirst 托管数据库。

当我使用 ARM 部署应用服务时,我生成了一个输出,确保它创建了一个服务主体:

 {
  "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:

正在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;
    }

启用跟踪后,令牌为:

 .eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI....

使用 jwt.io 解码的结果:

{
  "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]

Persist Security Info = True根据网上的几个建议添加了,但这并没有检测到。

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.]

有没有人使用 CodeFirst、Migrations 和 MSI 连接到数据库?在这一点上,在真正被卡住了几个星期之后,我开始怀疑这是否可能。

感谢您的帮助——即使只是证明它可以工作,对于初学者来说。

4

2 回答 2

1

不幸的是,据我所知,没有。一个项目的主要绊脚石,该项目不得不退回到不安全的用户名/密码加载的连接字符串。

于 2019-01-11T21:34:34.573 回答
0

您可以像这样在 sql 连接上设置访问令牌:

  1. 安装Microsoft.Azure.Services.AppAuthenticationnuget包
  2. 像这样设置你的上下文类:

    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; }
    }
    
于 2019-05-01T09:27:51.653 回答