Connecting to SQL Server from .NET using an Active Directory Service Account

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I have Winforms application written in C# which connects to a SQL Server Database. When I connect to SQL Server I build up a connection string which can contain either SQL Server login details or use Windows Authentication, in which case I omit the user name and password and use the

"Integrated Security=SSPI" 

setting in the connection string.

Now, a user requested that they have the option to connect to MS SQL Server using an Active Directory Service Account as opposed to a Network User account (which is what I assume the connection using Windows Authentication will pass through.

I am not familiar with service accounts or Active Directory and was wondering if someone could point me in the right direction. Is there some way of building a connection string that will allow my application to connect to the database using a specific Active Directory Service Account?

Connection strings have nothing to do with this.

a user requested that they have the option to connect to MS SQL Server using an Active Directory Service Account as opposed to a Network User account

What that means is that the user has requested your application to run as a service account, not as the currently logged in user. One easy way to do it is to simply start the application under runas /netonly:

runas /netonly /user:domain\serviceaccount MyWinFormsApp.exe

This way your application runs as a domain service account on the network and it will connect to the SQL Server using the domain\serviceaccount credentials. This would satisfy your client's requirement, at least on a shallow surface cursory look.

If the solution of using runas is not satisfactory (client may legitimatly complain that it requires users that start the applciation to know the domain\serviceaccount password) then things get a bit more complicated. The correct way of doing it is o split your application in two, an UI presentation layer .exe application that runs under the logged in user credentials and a business logic layer component that runs, as a service, under the domain\serviceaccount credentials. The two components communicate using your IPC of choice (usually WCF). As you probably realize, this require s major rewrite of your application.

Some may suggest to use have your application impersonate the domain\serviceaccount before opening the connections to the database. I would strongly discourage that because of the serviceaccount password storage/retrieveal mess. Since the app will be required to know the serviceaccount password in order to impersonate it, the user logged on running the application will either know that password or easily be able to find it (there is no way to prevent him form find it if the application can find it). Since the domainservice password is accessible to the logged in user anyway, he may just use the runas /netonly solution. And that finally explain why the runas solution is just a shallow smoke and mirrors solution: the only reason your client may had requested what he requested is that he wants to separate the privileges of the users logged in from the privileges of the application (ie. don't give SQL Servera ccess to every employee). Since the runas solution (as well as impersonating in the app) require the logged in user to know the service account password, the separation of privileges does not really occur since hte logged in user can use any time it wishes the service account password and elevate his privileges to access the SQL Server database at will. Therefore the only solution worth talking about is the separation of the application in two parts.

Configure Windows Service Accounts and Permissions, Get acquainted with the service accounts that are used to start and run NET SDK API � Errors and events � Event classes name resolution service that provides SQL Server connection information for The MSA must be created in the Active Directory by the domain administrator before SQL Server setup� runas /netonly /user:domain\serviceaccount MyWinFormsApp.exe. This way your application runs as a domain service account on the network and it will connect to the SQL Server using the domain\serviceaccount credentials. This would satisfy your client's requirement, at least on a shallow surface cursory look.

Connection string "Integrated Security=SSPI" will pass the current user credentials to SQL Server. However if the user want to use other Active Directory User without changing the connection string, use Run As functionality offered by the Operating System. If you are using windows 7, press Shift and Right click on the exe and choose Run as different user.

This is just a hack not a proper solution.

Tutorial: Use AD authentication for SQL Server on Linux, Tutorial: Use Active Directory authentication with SQL Server on Linux Join SQL Server host to AD domain; Create AD user for SQL Server and set SPN; Configure SQL Server service keytab; Secure the Connect to SQL Server and create a new, AD-based login: SQL NET, Connection String Syntax. Quickstart: Use .NET Core (C#) to query a database in Azure SQL Database or Azure SQL Managed Instance. 05/29/2020; 4 minutes to read; In this article. APPLIES TO: Azure SQL Database Azure SQL Managed Instance . In this quickstart, you'll use .NET Core and C# code to connect to a database. You'll then run a Transact-SQL statement to query data.

Generally speaking, an active directory account is the same as a network user account. There are exceptions, such as Workgroups and non-AD networks, but for the most situations, they will be the same.

If your users are on a non-AD network, then your users are asking for something quite complicated (cross-domain trust between different network types).

However, if your users are running in an AD network, but want to log on as a different user than their interactive user (for example, they are logged on to their machine as MJames, but want to log into the database as FJones), then you have two choices:

1) Tell them that they need to log on to their machine as the requested user.

2) Prompt the user for their login credentials and that execute an AD login to validate their credentials, then impersonate that logged on user using the .Net framework. This MSDN link, although for ASP.Net, has the basic information that you need, specifically the section on Impersonating by Using LogonUser.

In any of the above cases, your Integrated Security=SSPI command string argument will connect to the SQL Server as the AD user that your user is currently logged on as, either directly to the machine or through impersonation.

Microsoft SQL Server login using Active Directory Credentials , The error message is that the certificates were issued by an untrusted authority. That would be your AD domain, most likely. A couple of workaround that you� If you are using SQL Server 2014 or above, then you can make use of group Managed Service Accounts (gMSA), which I will cover in my next tip. Next Steps When setting up SQL Server to make use of Managed Service Accounts you should check out these additional tips that cover a range of recommended practices.

"Integrated Security=SSPI" will pass along the credentials of the currently logged in user. A service account is just another user, albeit one you will actually have to specify in the connection string. I assume that by default, you will want to just pass along the logged in user by using "Integrated Security=SSPI", but offer the option to specify credentials to login with, in which case you would use a connection string that specifies the username and password.

AD User vs SQL User for SQL Server Authentication, When using WIA, managing accounts to access a SQL Server generally only requires granting the permissions to a runtime (service) account� PowerShell offers multiple options for connecting as a different Windows Account that are not directly related to SQL Server, if SQL Login is just not an option. You can look into commands like “Invoke-Command” or “Start-Process”, these provide an option to also pass in a Windows credential.

This is the connection string I tried and it worked for me. Yes - Integrated Security=SSPI is needed.

"Data Source=myServerName\myInstanceName;Initial Catalog=myInitialDB;App=myApplication;Integrated Security=SSPI;"

Using a Service Account to Run the IIS App Pool & Access the , Using SQL Management Studio (on your database Ensure that your domain/ AD server is selected as the� I'm having trouble testing a connection to Azure SQL Server using SSMS with an active directory service principal. I have an AD Admin account created, and have successfully added a colleague's AD user account, whom can connect via SSMS. The service principal is a Web App / Api service principal with a key.

Domain Account, Local user accounts are used to control access to the computer on which you are working. Active Directory user accounts are created and managed using the Active Microsoft SQL Server is configured to use a Managed Service Account just You can use the standard Windows 2000 “net” command-line tool to make � Open SQL Management Studio using SQL Authentication SysAdmin (SA) Account. Open up Security then Right Click on Logins, choose “New Login” On the new login screen choose “Search” On the search screen ensure you are searching the Entire Directory, type in the user name, choose Check Names, then choose ok.

SQL Server Security Best Practices, Here are the types of accounts you can use for SQL Server services: to connect to SQL Server because it can leverage the Active Directory account, group and� Using Active Directory for SQL Server has a number of advantages, which makes it the recommended approach. SQL DBAs will often want to have the database in Windows Integrated Authentication (WIA) mode only (instead of "Mixed mode" where SQL Authentication is also support) because of it: When using AD, account authentication is centralized.

Using Windows Authentication with an Amazon RDS for SQL Server , The DB instance works with AWS Directory Service for Microsoft Active Directory, Use the Amazon RDS master user credentials to connect to the SQL Server DB Creates a directory administrator account with the user name Admin and the�

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  • Thank you. That was a very helpful response.