Sql-server – Is it viable to attribute permissions to SQL Server virtual accounts (NT Service\SQLSERVERAgent, etc)

permissionssql serversql-server-2012windows

Using MS SQL Server 2012 in Microsoft Windows Server 2008.

I am somewhat confused by the New Account Types Available with Windows 7 and Windows Server 2008 R2 virtual Windows accounts [NT SERVICE]\<SERVICENAME> like NT SERVICE\MSSQLSERVER, NT SERVICE\SQLSERVERAGENT, etc.

Is it viable of daring to give permissions to, for example, [NT Service\SQLSERVERAGENT]' to access a shared resource (or local file or directory)?
And, how to do this?
For example, to attribute permissions to a Windows file share to run psexec ?

While browsing (or pressing button Find< or adding group and users to a file share) the available in domain and/or local/remote computer, there is no such accounts available and entering it manually give an error:

"An object (User or Built-in security principal) with the following
cannot be found…"

enter image description here

Related (though different) question that provoked this one: How to copy bak files to remote share (without AD/domain accounts involvement)?

UPDATE, answering @Jon-Siegel's comment to my deleted answer:
there is no error in my screenshot, sometimes virtual accounts detection happens, sometimes fails. Really the last 2 days I cannot reproduce it.

Can it be explained that I do not have proper permissions?
When I try to open SQL Sever Configuration Manager, I am always getting: 

--------------------------- 
SQL Server Configuration Manager
 --------------------------- 
Cannot connect to WMI provider.   
You do not have permission or the server is unreachable.  
Note that you can only manage SQL Server 2005 and later servers with SQL Server Configuration Manager.  
Invalid class [0x80041010] 
 --------------------------- 
OK   
---------------------------

SQL Server Configuration Manager error

Also, in eventvwr.msc I observe a lot of permission-related errors (under System): 

The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID   
{FDC3723D-1588-4BA3-92D4-42C430735D7D}  
 and APPID   
{83B33982-693D-4824-B42E-7196AE61BB05}  
 to the user NT SERVICE\SQLSERVERAGENT SID (S-1-5-80-344959196-2060754871-2302487193-2804545603-1466107430) from address LocalHost (Using LRPC).  
This security permission can be modified using the Component Services administrative tool

.

enter image description here

I am not sure whether I should open another question or stick with this one…
The follow-up questions are:
1)
what are permissions for reading virtual accounts?

I cannot list anything except local computer in "Select Users, Computers, Service Accounts, Cgoups or Built-in security principals" – the entries are visible but on opening them there are no a single sub-entries visible to me:

enter image description here

2)
How can I enter the NT SERVICE\SQLSERVERAGENT (by typing in it manually) on another computer?

Currently I can choose it only on local computer:

  • by choosing the name of local computer through pressing "Locations…" button, then choosing top entry in the tree list – see the scrrenshot above;

  • then typing "NT Service\SQLSERVERAGENT" in "Enter the object names to select" listbox

    Check names - before

    which is after pressing "Check names" button:

    enter image description here

That is, there is no hint how to type it.
Pressing "Advanced…" button, then "Find Now") shows a list where virtual accounts are absent:

enter image description here

Best Answer

So, firstly have a quick look through this which explains virtual accounts:

TechNet: Service Accounts Step-by-Step Guide

To answer your questions:

1/ You can't list these virtual accounts in that dialog box, I'm not 100% sure of the reason, but you always need to type them in manually, in your screenshot you also have the active directory domain listed, you would never see them in here as they are local accounts.

2/ You can't add permissions on files/shares on another machine by finding these accounts, as they live only on the machine that you installed SQL server on (NVOSIB-1C in your case). These accounts though can access resources on the network, but they do so in the context of the machine account of the server.

So, an example would be you have NVOSIB-1C with SQL Server installed and NVOSIB-Filer with a share on it that you want the SQL Server account to be able to access.

What you would do in this situation is to add the machine account of the SQL server to the permissions on the file share, you can do this just by assigning the account DOMAINNAME\NVOSIB-1C$ the permissions you want and then as the virtual account accesses the network in the context of the machine it lives on, it would have permission to do so.

Obviously this limits your ability somewhat to assign permissions, as anything running on NVOSIB-1C that authenticated in the context of the server would now have access to the share, if this is a concern, you can do one of 2 things:

  • Use standard domain service accounts for the SQL Server services, you then need to maintain passwords etc for these, but it makes assigning permissions somewhat easier.

  • Set up a managed service account in AD, this has the advantage that the local accounts have in that you don't need to worry about passwords, and also the advantage that you can see and manage them centrally in AD like a normal account, the main disadvantage is that you need to have the managed service account created before you install SQL server, so in your case you would have to reinstall to take advantage of this.

Related Question