I've read a bunch of articles saying you should always remove the guest user from the user databases and model. It seems to me that if a user only has public access then the user can't do anything on the database. If the guest user only has public access to a user database how is it a security threat? I must be missing something.
View 0 RepliesBelow query tells us if guest user is enabled or disabled in a particular database
SELECT dp.name, CASE perms.class WHEN 0 THEN 'Yes' ELSE 'No' END AS 'Enabled'
FROM sys.database_principals dp
LEFT JOIN (SELECT grantee_principal_id, class FROM sys.database_permissions
WHERE class = 0 AND type = 'CO' AND state = 'G') AS perms
ON dp.principal_id = perms.grantee_principal_id
WHERE dp.name = 'guest';
Do we have a query which can also add the database name to above query output? The output must have columns with data against Name,Enabled,Database name
We have an old ASP application that authenticates to a SQL Server 2000 database using the IUSER account.
We are exploring the possibility of moving it to a DMZ so users can access from home. The IUSER account is being used for all database activity for this application. Is there any reason to be concerned about using IUSER as opposed to sql authentication for this tool, or any other security risks I should be wary of. Mind you there may be some sensitive information contained in the database. Thanks in advance.
Hi all,
I have setup a new SQL 2000 SP4 and internal auditor query about revoke permission from Public role and remove guest from all databases.
1. Can I revoke all default permissions (select on system tables in all DBs) from "Public" role? I am concern any error after such action.
2. I found that guest account in DB -- master, tempdb and msdb. According to Microsoft documents. The account should not remove and can't from master and tempdb. How about msdb?
Thanks,
Regards,
Edwin
One of our databases has at some point in its dark past had the owner of the guest schema changed to be a named user, rather than the default guest user. Correcting this feels like it would be easy enough by running the following...
  ALTER AUTHORIZATION ON SCHEMA::guest TO guest
but that results in..
  Msg 15150, Level 16, State 2, Line 3
  Cannot alter the schema 'guest'.
I realise the guest schema is a special one, and cannot be dropped, but I'm not trying to do that. End goal is to export the database to a SQL Azure DB, and this guest schema assignment is blocking that process from completing.
In database we are planning to implement row level security.For this we need to create users or we need create login for each one?
View 1 Replies View RelatedIn SQL2K5 guest user can not be dropped from ANY databases. How ever we can use the following command to disable it.
USE <Database Name>
GO
REVOKE CONNECT FROM GUEST
GO
How to find in a DB, whether guest user is disable or not, using TSQL?
------------------------
I think, therefore I am - Rene Descartes
Nel database "master" ho mappato, per errore, l'utente "guest" su unutente sql "XXX" creato in SQLServer.Questo tipo di impostazione non permette più di aver accesso conl'utente anonimo "guest" (mappato su null) al db (con autorizzazionilimitate al ruolo public).Ho provato sia da EM che con le varie SP a rimuovere l'utente, amapparlo su un'altro utente, ... ma non sono riuscito a ripristinarela situazione di partenza.Mi servirebbe una idea per non dover effettuare il backup di tutti idb, disinstallare SQLServer, reinstallare SQLServer e fare il restoredi tutti i db (soluzione possibile ma che tengo come ultimaspiaggia!!).Grazie
View 1 Replies View RelatedI've used the following:
EXEC sp_MSforeachdb 'USE [?];
REVOKE CONNECT FROM GUEST;'
GO
And this is what I get:
Msg 15182, Level 16, State 1, Line 2
Cannot disable access to the guest user in master or tempdb.
Msg 15182, Level 16, State 1, Line 2
Cannot disable access to the guest user in master or tempdb.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
Msg 15151, Level 16, State 1, Line 2
Cannot find the user 'GUEST', because it does not exist or you do not have permission.
When I do this:
EXEC sp_MSforeachdb 'USE [?];
SELECT ''[?]'' AS DBName,* FROM sysusers;'
GO
The guest sid for all tables shows 0x00, is this the reason I get above errors?
I try to attach a database mdf file to Microsoft SQL server 2014 on Amazon Elastic Computing Cloud, EC2, but fail with the following message, "User 'guest' does not have permission to run DBCC checkprimaryfile. (Microsoft SQL Server, Error: 2571)" The ID I use to REMOTE login has administrator rights and I have chosen to "run as administrator"
View 1 Replies View RelatedEverytime I reboot my sql server 2000 the guest account on tempdb is gone, but the guest account on master remains.
Can anyone offer my any ideas how I can stop that from happening?
Hi all.
I don't know if this is the right forum to post this question, but here it goes.
We have restored into sql 2005 the database backups made in sql 2000. We connect with trusted connection and application roles, and when trying to execute a transaction to another database (with the guest user), we get a permission error.
Does anyone know if, apart from restoring the databases, we should do something else to get the guest user working the same way as with sql 2000 in the restored databases?
Thanks in advance for your help.
I use from sql server 2008. and c#
what is the best connectionstring?
I don't know if i use Persist Security Info and Integrated Security or not?
And if yes then their value must be true or false?
How can i assign permissions to a newly created users as of an existing user?
View 3 Replies View RelatedHow do you handle user level security with SQL Server 2005?
Say I have an HR database.
In Active Directory I have two groups: Managers, Employees.
Now in this HR Database I want to setup permissions in such a way that Managers can see all employees under them (but not other managers) and the employees can only see themselves.
(I'd have various levels of management defined in a table somewhere, so that each employee has a manager ID that links to another employee so that the CEO would be manager of everyone by working down the chain).
What I'm trying to understand is the best way to handle the permissions.
I'm not entirely clear on how to deal with that.
Would I use user chaining to do that, I wouldn't need impersonation (that's just for instances where you want dynamic SQL and it won't execute with user chaining, correct?)
Anyway, just looking for some general direction on this (obviously I need to get a good book it would seem).
Would I create a stored procedure that runs with EXECUTE AS permissions so that I'd have a non-interactive login it uses that has table access then all the other users have permission to execute the sproc?
So that sproc runs, pulls back a SELECT * FROM tbl_HRINFO and using a WHERE constraint limits who is returned WHERE SupervisorID = CurrentLoggedInEmployeeID ?
Also: How can I determine who is logged in and running the procedure, would the sproc use the SELECT USER_NAME command to see who was running it?
As you can see, I'm working from square one on all of this.
Not sure if my posting entirely made sense, but hopefully someone can get me pointed in the right direction, thanks!
Sir i am trying to connect sql from my LAN to my networked computers but whenever i tried to register it through Enterprise manager i get following "SQL Server registration failed because of the conection failure displayed below.Do you wish to Register anyway? Login failed for user 'SW17/Guest'
where SW17/ is my another computer name...
i have checked tcp and named pipes
and confirm username for sql authentication too
please help me as i being late submit my project
Hi all,
I just read this article. The kind of select is called dirty read.
So select with nolock might have inaccurate result...? PLEASE COMMENT ON THIS. I am using it to count some huge tables, and has problem on the result..
http://www.4guysfromrolla.com/webtech/101100-1.2.shtml
NOLOCK
Using NOLOCK politely asks SQL Server to ignore locks and read directly from the tables. This means you completely circumvent the lock system, which is a major performance and scalability improvement. However, you also completely circumvent the lock system, which means your code is living dangerously. You might read the not-necessarily-valid uncommitted modifications of a running transaction. This is a calculated risk.
For financial code and denormalized aggregates (those little counters of related data that you stash away and try desperately to keep accurate), you should play it safe and not use this technique.
I am sertainly no SQL expert so I am looking for a bit of help(actually quite desperate).The extra CPU and 1GB of RAM to be added to a server (Compaq DL380 G2:1.4 GHz PIII with a Gig of RAM) have not come in and we are scheduledto go live tomorrow with a MS SQL Server web app. Will potentiallyinsufficient hardware resources endanger the data of other appsrunning on the SQL Server or will the system simply be slow foreveryone?Basically, I need to know whether SQl Server bogs down gracefully(under 2x-3x an acceptable load) or will we be corrupting the databasewith a crash.Thanks a million,Bert
View 3 Replies View RelatedUse the view master.sys.sql_logins (new in 2005) to get at the varbinary passwords like you did in your Sql Server 2000 scripts (instead of using passwords from master.dbo.sysxlogins).
I have altered the sp_help_revlogin (from Microsoft article # 246133 )
PLEASE TEST/FIX before you use this:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sp_help_revlogin_2005]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[sp_help_revlogin_2005]
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS OFF
GO
CREATE PROCEDURE sp_help_revlogin_2005 @login_name sysname = NULL AS
DECLARE @name sysname
DECLARE @logintype char(1)
DECLARE @logindisabled int
DECLARE @binpwd varbinary (256)
DECLARE @txtpwd sysname
DECLARE @tmpstr varchar (256)
DECLARE @SID_varbinary varbinary(85)
DECLARE @SID_string varchar(256)
IF (@login_name IS NULL)
DECLARE login_curs CURSOR FOR
SELECT sid, name, type, is_disabled FROM master.sys.server_principals
WHERE name <> 'sa' and type in ('S','U','G')
ELSE
DECLARE login_curs CURSOR FOR
SELECT sid, name, type, is_disabled FROM master.sys.server_principals
WHERE name = @login_name
OPEN login_curs
FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @logintype, @logindisabled
IF (@@fetch_status = -1)
BEGIN
PRINT 'No login(s) found.'
CLOSE login_curs
DEALLOCATE login_curs
RETURN -1
END
SET @tmpstr = '/* sp_help_revlogin_2005 script '
PRINT @tmpstr
SET @tmpstr = '** Generated '
+ CONVERT (varchar, GETDATE()) + ' on ' + @@SERVERNAME + ' */'
PRINT @tmpstr
PRINT ''
PRINT 'DECLARE @pwd sysname'
WHILE (@@fetch_status <> -1)
BEGIN
IF (@@fetch_status <> -2)
BEGIN
PRINT ''
SET @tmpstr = '-- Login: ' + @name
PRINT @tmpstr
IF (@logintype = 'G' OR @logintype = 'U')
BEGIN -- NT authenticated account/group
IF @logindisabled = 1
BEGIN -- NT login is denied access
SET @tmpstr = 'EXEC master..sp_denylogin ''' + @name + ''''
PRINT @tmpstr
END
ELSE BEGIN -- NT login has access
SET @tmpstr = 'EXEC master..sp_grantlogin ''' + @name + ''''
PRINT @tmpstr
END
END
ELSE IF (@logintype = 'S')
BEGIN -- SQL Server authentication
SELECT @binpwd = password_hash FROM master.sys.sql_logins WHERE SID = @SID_varbinary
IF (@binpwd IS NOT NULL)
BEGIN -- Non-null password
EXEC sp_hexadecimal @binpwd, @txtpwd OUT
SET @tmpstr = 'SET @pwd = CONVERT (nvarchar(128), ' + @txtpwd + ')'
PRINT @tmpstr
EXEC sp_hexadecimal @SID_varbinary,@SID_string OUT
SET @tmpstr = 'EXEC master..sp_addlogin @loginame = ''' + @name
+ ''', @passwd = @pwd, @sid = ' + @SID_string + ', @encryptopt = ''skip_encryption'''
END
ELSE BEGIN
-- Null password
EXEC sp_hexadecimal @SID_varbinary,@SID_string OUT
SET @tmpstr = 'EXEC master..sp_addlogin @loginame = ''' + @name
+ ''', @passwd = NULL, @sid = ' + @SID_string
END
PRINT @tmpstr
END
END
FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @logintype, @logindisabled
END
CLOSE login_curs
DEALLOCATE login_curs
RETURN 0
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO
We are developing an application that requires change tracking.We tested it in development and test environments and we are preparing our production deployment.The very first thing that needs to be done is an
ALTER
DATABASE [db_name] SET
CHANGE_TRACKING =
ON (CHANGE_RETENTION
= 2 DAYS,
AUTO_CLEANUP =
ON)
We are holding on this first step because this statement alone executed for a good 4min on the development server. The production environment is many times larger and busier, and we can’t afford service disruption, so we are at the point where we need to understand what’s involved in running this ALTER DATABASE statement.Is there any documentation on what is happening behind the scene when this statement executes such that we can assess the risks of running it in production?
I would like to know if there is a way to find out who changed a users roles/access WITHOUT using the audit function. For example, if a user account was created and given SA access then changed to read only, how can I find out who made that change? I tried searching for an answer, but kept getting no results. I'm thinking this may tie into the sys.sysusers view?
View 3 Replies View RelatedI am relatively new to sql developer. There is a new user that just joined our organization. I am trying to grant him the same direct grants privilege to the tables that an existing user has. The existing user has a ton of direct table access privileges and it will take days if I had to do each grant one by one like: grant select,insert,delete,update on 'table name' to 'user id'. Is there a way of copying or inserting an existing user's privilege and granting it to a new user.
View 2 Replies View RelatedI have an SSIS package built by another developer, and now that I'm running it under my login the passwords won't save. The solution and packages are setup with ProtectionLevel EncryptSensitiveWithUserKey, but how do I get the User Key to reset so I can now save passwords? I can re-enter them, but whenever I enter hte password and test it then click OK it still has the red arrow next to the connection as if there's an error. I can create new connections and those passwords save fine, but with 40-50 items in this package I hate the thought of having to go into each and change the connection.
I tried changing the package and solution to DontSaveSensitive then rebuilding and closing then reopening, I hoped there was some option to reset the User Key just as if I created the solution. If this option doesn't exist why?
Hi all,
I want to create a user with the following criteria:
The user can able to "CREATE","ALTER" the stored proceudres but not "DROP" them.
So for this, I did like this:
--Schema Level
grant control on SCHEMA::dbo TO username
--Procudure level
GRANT CREATE PROCEDURE TO username
--Denying on schema level
Deny alter on schema::dbo TO username --------- But, if i do this, then the user cannot able to create anything in the schema.
Can anyone give the workaround so that the user can able to "Create" as well "Alter" the stored procedure but not able to "Drop" the stored procedure.
Thanks.
We have a a DTS package set up to run against another SQL Server. Using an integrated login is there a way to map an NT Authenticated users is
the sql server login id mapping to this attached server. The DB we are going against only uses NT authentication to attach to.
I have an asp page that currently is creating a database and a userlogin for that database. After everything successfully (I thought)executed, I tried to change my connection properties for the serverand then login as this new user. It wouldn't allow me to, so I loggedback in as the administrator and looked at the properties for the newlogin. On the general tab, it had the user's default databasespecified as the new database that I had created in the asp page, butwhen I went to the database access tab, the database was not selected.So, I'm not sure how to set that in my script. I've done somesearching in BOL, but I can't figure it out. Also, if there's a wayto do this in a query, or stored procedure, will it also specify whattype of role the user has (public, db_owner, etc.)? Thanks.
View 5 Replies View RelatedI was just analysing the security which can be given to different users to access respective databases. So i tried, on my local server, to deny permission to myself to access Model database. After this i am not able to connect to my local server at all. Error: Permission denied. I am using windows authentication mode.
I have also deleted the local server registration, and re-registered it, but still the condition is same. Do i need to uninstall SQL Server completly to get rid of this prob.? I also registered a new data server, and there every thing is going fine. So now what do i do to get connected to my local server.
In some our dotabases I can see Schemas created with the same name as Domain User name (domainusername). Schema owner for those schemas is not dbo but the same user as in schema name. How this happens? Is any way to prevent or prohibit this?
View 9 Replies View RelatedWhat is the easiest way to find out what objects a security login has mapped to it? Something that would show all the explicit grants a specific user has.
View 6 Replies View RelatedI have created a user Finance and I want to grant him access only to see views which are created under Schema called "FinanceQuery".
Note: View may use tables from multiple schemas example: dbo. Staging. ectÂ
By doing this, I want to achieve that this user Finance can see only Views created under Schema FinanceQuery and should not see any other objects (tables, Stored Procedures, Functions etc.)
I need to provide a User with below permissions:
1. Ability to read and write records in tables in both the X schema and Y schema
2. Ability to read metadata about objects in the X and Y schema
3. Ability to execute stored procedures in the X and Y schema
4. Ability to create and update the necessary schema objects used by X, including but not limited to tables, views, and indexes
5. CREATE FUNCTION permission
6. ALTER and EXECUTE permissions on the X schema
7. VIEW DEFINITION permission on the X and Y schemas to enable view export.Â
For the point 1, I will assign db_datareader,db_datawriter database roles to the user
For the point 2, when I have searched web, I found out ReadDefinition permission should be granted. I could find only viewDefinition but not ReadDefinition.
For the point 3, 'USE DataBaseName GRANT EXECUTE TO User; Go' - does this sql suffice?
For the point 4, I am not sure what should be done.
For the point 5, 'USE DataBaseName GRANT CREATE FUNCTION TO User; Go' - I guess this will work
For the point 6, Can I use same SQL as point 3 including ALTER ?
For the point 7, 'USE DataBaseName GRANT VIEW DEFINITION TO User; Go'
Is there a kind of log to trace the change on DB user, such as when the password/permission is changed, etc. If yes, how can i get this log; If no, is there a way to achieve this thing?
View 2 Replies View RelatedWe have a user who is set to following permission on a DB,
server role: public
db permission: db_datareader
But when user tries to use following query on xml column he getting error as below,
SELECT ticket_id FROM dbo.Form WITH(NOLOCK)
WHERE LEN(form_document.value('(/Form_Fields/Form_Field[@field_type_desc="Number"]/@field_value)[1]','varchar(100)')) > 0
Error:
The EXECUTE permission was denied on the object 'testDB_Form_Schema', database 'testDB', schema 'dbo'.Do i have provide any additional permissions to query xml content ?