SQL Server Access Restriction

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SQL Server Access Restriction

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GregoryF

Posted Friday, February 12, 2010 5:32 AM

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Comments posted to this topic are about the item SQL Server Access Restriction

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Post #864550

Gary Varga

Posted Wednesday, March 03, 2010 1:21 AM

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Thanks for this. I really learnt something new here.

BTW, I love the URLs in the comments (do the same thing myself) as it is a great way to document something which is really documented elsewhere.

Gaz

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Post #875733

ianT

Posted Wednesday, March 03, 2010 1:47 AM

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How well does this scale? If I have thousands of users hitting the server...

If I'm right, the scale issue will very often not be picked up during testing but only appear when it is released to the production environment.

Post #875743

GregoryF

Posted Wednesday, March 03, 2010 7:37 AM

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As for scaling, I am not sure how well it would handle thousands of logins per second. My best advice would be to add at the begining of the trigger a exit clause that covers 90% of the cases, i.e.

1) the sql server service account logging from the local server
2) the application service service account where HostName in (list of app servers)
3) and/or ApplicationName = '<Application Name>'
4) any member of the sa role (perhaps hardcoding the members of your dba team)

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Post #875970

Tom Garth

Posted Wednesday, March 03, 2010 8:00 AM

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Really, really, really good!

Thanks Greg.

Tom Garth
Vertical Solutions

"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -- Will Rogers

Post #875990

srinivasreddy4uhyd

Posted Thursday, March 11, 2010 1:20 PM

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Thanks a lot Greg. This script is really helpful.

Correct me If I am wrong.

My situation is I want to restrict group of accounts which can login from some applications but not from SSMS / Excel / DBArtisan / .....

As suggested by you the sql service account can be added to the [BlackList] with [RestrictionEnabled] to zero to avoid rollback right ?

Please Advise.

Thanks & Regards,
Srini

Post #881303

GregoryF

Posted Thursday, March 11, 2010 3:59 PM

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srinivasreddy4uhyd (3/11/2010)

Section #6 of the Trigger covers this scenario:

--#6
--If a particular application connects to SQL Server, with a given UserName (i.e. service account cannot connect with SSMS)
If(Exists(Select * from SQL_Audit.dbo.BlackList where AppName = @AppName and LoginName = @User and RestrictionEnabled = 1))

To set it up, insert to the blacklist table

User and application

Each user and application requires a seperate entry, i.e.

user1, Excel
user1, Access
user1, Toad
user2, Excel
user2, Access
user2, Toad

So update the table with each developer login and the application that cannot be used.

Alternatively, you could add a condition at the begining of the trigger:

If ((@User in ('User1', User2', 'User3')) and (@AppName in ('Excel', Access', 'TOAD')))
Begin
Rollback

insert into SQL_Audit..Violations
(PostDate, LoginName, IPAddress, HostName, ServerName, AppName, ViolationType)
values (@PostTime, @User, @IPAddress, @HostName, @SrvName, @AppName, 'ApplicationName')

Return;

End

The advantage of the second method is that the hardcoded values require less disk IO to process; however, the disadvantage is that the SP would have to be recreated to every change in Users and apps.

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Post #881406

atul.verma.ietk

Posted Friday, December 03, 2010 7:06 AM

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Hi,

while using this script I had created sql_audit database but not able to create trigger getting following error while running provided scrip

Msg 156, Level 15, State 1, Procedure trg_LoginBlackList, Line 5
Incorrect syntax near the keyword 'as'.
Msg 1088, Level 16, State 119, Line 2
Cannot find the object "trg_LoginBlackList" because it does not exist or you do not have permissions.

Please revert ..........

Post #1029856

atul.verma.ietk

Posted Monday, December 06, 2010 8:19 AM

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any one plz help on this

Post #1030658

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