Need Security Advice On Xp_cmdshell, Bcp, Xml Procedure

Nov 10, 2005

I have a stored procedure that creates an xml file. It executes a SELECT
statement with the FOR XML clause and then writes the xml file using bcp and
xp_cmdshell. I am calling this procedure by passing it a parameter via ADO.
I have configured the SQL Server Agent with a proxy account so non-SysAdmin
can execute xp_cmdshell.

I'm concerned about giving non-SysAdmins execute on xp_cmdshell. I'm also
concerned about having to maintain the password on my proxy account when
that users' password changes.

Is there a better, more secure way to generate this xml file.

Thanks

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Stored Procedures, Security, Xp_cmdshell

Sep 27, 2000

To try to secure an outside web application we set up a user that
only has permission to execute a series of stored procedures that are
related to the appliation. Unfortunately a couple of those stored
procedures have to access system resources outside SQL Server so we
are using a call to xp_cmdshell from inside the stored procedure

SQL Server apparently won't let us do that unless we give our
restricted user (who is calling the initial stored procedure) execute
permission on xp_cmdshell. This, of course, negates most of the benefit
of setting up a restricted user. Is there some simple way I am missing
of running xp_cmdshell from inside s stored procedure without the user
calling the stored procedure having execute permission on xp_cmdshell?

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Xp_cmdshell Security Context Problem

Jan 15, 2008

I am trying to run the following set of commands on our SQL 2005 SP2 server:


declare @cmd varchar(1000)
select @cmd = '%SystemRoot%system32cscript.exe %SystemRoot%system32iisvdir.vbs /create TestSite testvirtualdir C:Inetpubwwwrootfiles'

exec master..xp_cmdshell @cmd


The objective is to programmatically create an IIS virtual directory from within a stored proc. I already have a proxy account configured using the sp_xp_cmdshell_proxy_account proc. The SQL server is a member server to a domain and the proxy account is a member of Domain Admins (per iisvdir.vbs requirement). When I login to the server as the proxy account and run the dos command in a window it executes just fine. However, the above SQL statements result in the following in server management studio:

"You cannot run this command because you are not an administrator on the server you are trying to configure."

If the xp_cmdshell runs under the proxy account, and the proxy account has been verified to be able to login and run the script independently, what gives?


Edit:
Just to make sure the proxy account was setup properly, I used the following cmd

select @cmd='set'

and it's results set shows

USERNAME=sqladmin

which is indeed the name of the proxy/windows account that I can run the dos script under when logged into windows...

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Security Problem Running Xp_cmdshell From Non-sa Account

Dec 17, 1999

Our system is MS SQL Server v7 and NT 4. We have a stored procedure that exec's xp_cmdshell to run an external program located on the server. When a user who has 'sa' rights runs this stored procedure it works fine. When a 'non-sa' user (via the "BuiltinUsers" NT account) runs it, xp_cmdshell produces the following error:

Msg 50001, Level 1, State 50001
xpsql.c: Error 1385 from LogonUser on line 476

Is there an NT security or SQL Server setting I've overlooked that can be changed to allow non-sa users to xp_cmdshell programs?

n.b. The BuiltinUsers account does already have execute permission on the xp_cmdshell procedure.

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Newbie To Remote SQL 2005 Express - Need Roles/security Advice

Aug 30, 2006

Hi,I'm
building an asp.net website using web developer express and I have a
SQL 2005 express install on the same machine.  Using windows security,
everything works fine for development.Now I need to get it working at the client site, where the web server and SQL 2005 Express are on different machines.I'd
tried using windows authentication but that didn't work, probably
wasn't doing it correctly.  I'd like to try SQL Authentication, at least temporarily, since I
can replicate that on my laptop at home easily I think.I created a new SQL login but was really baffled by the screens showing roles and schemas, etc.   There's so many roles to choose from and wasn't sure if this new login needed to own any schemas. I
did turn on remote connections and mixed-mode authentication, the
probably now is my asp.net membership provider login page isn't
authenticating correctly, maybe my permissions are wrong on the
aspnet_.....  tables for users, roles, profiles, etc. Any advice?thanks,Bruce

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Advice On Security Model For XML Web Services For Many Users In Active Directory Role

Feb 21, 2006

I am working on the security model for an application that will be used by 100s of users with a dedicated SQL 2005 database for this application and access via SQL XML Web Services.

The client has asked to make it "open" during alpha testing such that anyone can access the web services without having to set them up first. Is there a way to do this? The best I can figure is to use mixed mode security and hard code a login and password. Any method using Windows authentication would require that I add every user at a minimum to the database.

In production, all users will have an active directory role specified that determines if they should have access to the web services or not. However, it is my understanding that to use Windows authentication, I would still need to add each individual user at a minimum as a Login to the SQL Server, and under best practices also as database users with permissions granted to the endpoint.

Am I correct in the above, or is there a more efficient way to achieve these results?

Thanks

-L

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Stored Procedure With Xp_cmdshell

Apr 16, 2003

I have a simple problem....

I am writing a stored procedure I want to use xp_cmdshell to execute a executable file...

Exec master..xp_cmdshell 'C:snort.exe', NO_OUTPUT

Nothing happens....how do I write this so it starts that program?

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Jan 31, 2005

Hello,

I have a question regarding the extended SPC 'xp_cmdshell'.

Basically I want to determine the username and userdomain in a stored procedure and what I know is that you can get this information in a "DOS-Box" with 'Set username' or 'Set userdomain'.

But if I use the above mentioned extended stored procedure in the following way:exec master..xp_cmdshell 'set username'I don´t get any resultset.

Does anyone know why I get different results depending on the fact if I call the 'set'-command in a "DOS-Box" or with the appropriate stored procedure?

Thank you for any help

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Stored Procedure Permissions With Xp_cmdshell On SQL 6.5

Jul 20, 2005

Is there any way to allow a user to use the xp_cmdshell extendedstored procedure without giving that user execute permissions toxp_cmdshell in SQL server 6.5? Let me clarify. Lets say I (as thedbo) create a stored procedure called sp_send_err:CREATE PROCEDURE sp_send_err @CompID varchar(20) ASdeclare @strCMD varchar(255)select @strCMD = "master.dbo.xp_cmdshell 'net send " + @CompID + """ERROR!""', no_output"execute (@strCMD)GONow lest say I give "user1" execute permissions on sp_send_err, but nopermissions on xp_cmdshell. When I run sp_send_error I get thefollowing error:"EXECUTE permission denied on object xp_cmdshell, database master,owner dbo".Why doesn't this work? What else can I do?

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Jul 20, 2007

How do most people handle database searches for things like a product database?  What I mean by that is your typical product table may look like:
ProductIDProductTitleProductDescriptionProductCategoryIDEtc...
Assuming you have a Full Text Catalog set up on the ProductDescription field, would you use Dynamic Sql or a Stored Procedure?
I'm wrestling with this because I haven't found a good way to either parse a parameter in SQL to make a stored procedure work with the same flexibility as Dynamic TSQL, and I would prefer not to have any direct access to the table from the application.
My other option (which to me isn't a great one) is to have a fairly large number of optional "keyword" parameters in the stored procedure and then parse them on the application side...this is less than favorable in that in theory someone could pass more keywords than I've allotted in my stored procedure.
 How would you approach this challenge?
Thanks in advance.
Ryan

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Mar 18, 2008

I have a 32 bit SQL 2005 EE clustered installation with 10GB of physical memory and AWE enabled. Our monitoring tool, Spotlight, is reporting the Procedure Cache to be 384MB and a Hit Rate of 75% on a fairly regular basis. Sometimes the Procedure Cache increases to 495MB and a Hit Rate of 82%.

(1) With 2005 can the Procedure Cache be increased?

(2) What is the max size of Procedure Cache?

(3) How do I increase the Hit Rate to a higher percentage?

I do not encounter the issue on any other SQL Server installation, however this is our only cluster.

DBCC PROCCACHE
num proc buffs = 64889
num proc buffs used = 1135
num proc buffs = 1135
active proc cache size = 2896
proc cache used = 364
proc cache active = 364

Thanks, Dave

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May 21, 2004

Hi, I have been searching for an answer to allow me to execute xp_cmdshell from withing store prcedure by calling the store procedure from an aspx via click on a button. This is what I found from my reserch but was not able to know where to set the rights and what each of them means:
"To run xp_cmdshell for a non-system administrator user, you must grant the following rights.
MSSQLServer and SQLServerAgent Services
Act as part of the Operating System.
Increase Quotas.
Replace a process level token.
Log on as a batch job."

The above quote was from the following link:
http://support.microsoft.com/default.aspx?scid=kb;en-us;264155

The bottom line is to be able to call a store procedure from an aspx page to execute the code which contain xp_cmdshell command, an example of such command is like:
------------------------------------------------------------
EXEC master..xp_cmdshell 'dir d:BT_importDatasales_option_price_report.csv'

Thanks for your help
ehx5

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Feb 15, 2008



Hi,

I want log event in event logger using xp_cmdshell store procedure.
I am calling eventcreate dos command.


xp_cmdshell 'C:> eventcreate /S \servername /L Application /T Success /SO Application Name /ID 1754 /D €śDescription of event€? '

I am getting error....


Incorrect syntax near 'eventcreate' /S \206.245.13.94' /L Application' /T Error' /SO WIPError'/ID 123'/D "Testing"'.


please help me.

thanks,

Chetan S. Raut.

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STORED PROCEDURE INSERT QUERY ADVICE

Jun 22, 2006

I have 3 tables:

1) users: users information
2) products: products available
3) purchases: has relationships to both the users and products tables.

How can I write a stored procedure that inserts to the Purchases table and
populates to the other two tables. I was thinking that the records have to be
populated first on the "users" and "products" table then
when my INSERT is done on the "purchases" table it will refer to the
other two tables. I tried query builder but it wouldn’t allow me to insert from
one single INSERT statement to one table. Any advice that on how to approach
this? Thanks you!

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Jul 20, 2005

SQL SERVER 2000Hi allThis is my first attempt at writing a stored procedure. I have managed toget it working but its unlikely to be the best way of handling the problem.While writing it I found some things that I don't understand so if any onecould shed any light it would be much appreciated. I have posted these atthe end.Sorry about the length but I thought it might be worthwhile posting the codeThe purpose of the procedures is as follows : we have a view of lots of bitsof information that need automatically mailing to different people. eachelement of information has a name allocated against it. If we had 100 piecesof data, 50 could go to manager 1 25 could go to manager 2 and 25 to manager3 etc...Both SP's look at the same viewThe first SP generates a distinct list of managers and for each managercalls the second SPThe second SP filters the view for the data belonging to the selectedmanager, and builds an HTML mail. It then sends all the bits of informationbelonging to that manager off in an EMAIL to him/her. ( It uses a brilliantbit of code from sqldev.net to handle the mail)the first mail then repeats for all the managers in the listCODE ---- SP 1ALTER PROCEDURE dbo.PR_ADMIN_CLIENT_WEEKLY_NOTIFICATION_2ASbeginSET NOCOUNT ONdeclare @no_of_managers as intdeclare @current_record as intdeclare @manager_name as varchar(100)-- count how many distinct managers we need to send the mail toselect @no_of_managers = COUNT(DISTINCT manager_name) FROMdbo.vw_client_notification_email_1-- open a cursor to the same distinct listdeclare email_list cursor for select distinct manager_name fromdbo.vw_client_notification_email_1 dscopen email_list-- for each distinct manager get the managers name and pass it to the storedprocedure that generates the mail.set @current_record = 0while (@current_record) < @no_of_managersbeginfetch next from email_list into @manager_nameEXECUTE dbo.pr_admin_client_weekly_notification @manager_nameset @current_record = @current_record+1end-- close the cursorclose email_listdeallocate email_listendCODE ---- SP2ALTER PROCEDURE dbo.PR_ADMIN_CLIENT_WEEKLY_NOTIFICATION(@current_manager_name as varchar(100))-- a unique managers name is passed from the calling procedureas beginSET NOCOUNT ON-- declarations for use in the stored procedureDECLARE @to as varchar(100)DECLARE @entry varchar(500)DECLARE @region as varchar(100)DECLARE @type as varchar(100)DECLARE @site_ref as varchar(100)DECLARE @aborted as varchar(100)DECLARE @weblink as varchar(1000)DECLARE @manager_name as varchar(100)DECLARE @manager_email as varchar(100)DECLARE @body VARCHAR(8000)DECLARE @link varchar(150)DECLARE @web_base VARCHAR(150)-- set up a connection to the view that contains the details for the mailDECLARE email_contents cursor for select region,type,site_ref,aborted_visit,link,manager_name,manager_e mail fromvw_client_notification_email_1 where manager_name = @current_manager_nameopen email_contents--some initial textset @body = '<font color="#FF8040"><b>Reports W/E ' +convert(char(50),getdate()) + '</b></font><br><br> <a href = http://xxxx > Click here to logon to xxxxx </a><br><br> '--fetch the first matching record from the table and build the body of themessagefetch next from email_contents into@region,@type,@site_ref,@aborted,@link,@manager_na me,@manager_emailset @web_base = 'http://'set @weblink = @web_base + @linkif @aborted = 0 set @aborted = '' else set @aborted = 'ABORTED'set @body = @body + '<font size="2"><b> Region </b>' + @region+ ' <b>Type</b> ' + @type+ ' <b>Site Reference </b> <a href = "' + @weblink + '">' + @site_ref+'</a>'+ ' <b>Unique Report Reference </b>' + @link + '<br>'-- continue reading the records for this particular message and adding on tothe body of the textwhile(@@fetch_status = 0)beginfetch next from email_contents into@region,@type,@site_ref,@aborted,@link,@manager_na me,@manager_emailif @aborted = 0 set @aborted = '' else set @aborted = 'ABORTED'if (@@fetch_status = 0) set @body = @body + '<b> Region </b>' + @region+ ' <b>Type</b> ' + @type+ ' <b>Site Reference </b> <a href = "' + @weblink + '">' + @site_ref+'</a>'+ '<b>Unique Report Reference </b>' + @link + '<br>'end-- close the cursorset @body = @body + '</font>'close email_contentsdeallocate email_contents-- generate the mailDECLARE @rc int EXEC @rc = master.dbo.xp_smtp_sendmail@FROM = N'FROM ME',@TO = @manager_email,@server = N'server',@subject = N'Weekly Import',@message = @body,@type = N'text/html'endQuestionsis the way I've done it OK. I thought I would be able to do it in a singleSP but I really struggled nesting the cursor things.@@fetchstatus seems to be global, so if your using nested cursors, how doyou know which one you are refering to. If you have multiple calls to thesame SP how does it know which instance of the SP it refers to.When I first wrote it, I used a cursor in SP1 to call SP2, but I couldn'tget the while loop working - I have a feeling it was down to the @@fetchstatus in the 'calling' procedure being overwritten by the@@fetchstatus in the 'called' procedure.The whole @@fetchatus thing seems a bit odd. In the second procedure, I haveto fetch, then check, manipulate then fetch again, meaning that the samemanipulation code is written twice. thats why in the first procedure I usedthe select distint count to know how long the record set is so I only haveto run the manipulation code once. Is what I have done wrong?its possible that the body of the mail could be > 8K, is there anotherdatatype I can use to hold more than 8Kmany thanks for any help or adviceAndy

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Dec 22, 2006

Is it a safe way to use a paramter (which fetch values from querystring) in the "where-part" of my stored procedure? Or is it an securityrisk because I dont know what the user is writing in the url-field?   
 I got the following sqldatasource which grab the value (from querystring) into the my parameter.
<asp:SqlDataSource ID="SQLDataSource"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
runat="server"
SelectCommand="My_StoredProcedure"
SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:QueryStringParameter QueryStringField="Myparameter" Name="City" Type="string" />
</SelectParameters>
</asp:SqlDataSource>
 

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Oct 31, 2007

Hi all,

this should be a easy question, but I can't really seem to find anything on it...

Here's the scenerio:

n-tier web app, with asp/iis/sql... All database calls are done via stored procedures with the same user (lets call the user: webuser)

webuser has NO access to the db in question, but it is granted EXEC on all stored procedures.

My question is, when a user tells the web app to say delete a record, the application server (iis) makes a call to the database with the webuser security cred's... It says execute the delete stored proc.

webuser has the ability to do this, so it happens. However, in what context (this may not be the right word) does the stored procedure execute?

ie: which user does the stored proc exeucte as. It can't be webuser can it? Because webuser does not have access to the base tables.

Does the stored proc execute as the user that created it?

I'm confused...

thx all!

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Mar 19, 2008

Hi,

I have a Stored Procedure in one database that grabs data from another database. I don't want the user to be able to read data from the tables that the stored procedure Selects from but I would like the user to be able to run the stored procedure. Pretty standard request I think.

What I have done is to give the user in question a login then assigned them the Execute Permissions on the stored procedure. Unfortunately they are still unable to run the stored procedure from my web app. I have "allow anonymous access" turned on but I am still getting an error when the user tries to execute the stored procedure.

Am I missing something here or could there be a bigger issue?

Thanks,
Patrick

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Sep 4, 2007



Hi,

I have a stored procedure spoc_CreateNewUser.

I have a role called 'creator'. I want that no one else other than creator should be able to execute this procedure through an asp.net application or directly.If anyone attempts, it should be logged.

HOw do I do this. Please explain the answer. I am new to this.

Ron

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Jan 11, 2008

Hi,


I created a CLR stored procedure, and added a web service reference, am using the generated proxy class

to call the web service, currently am facing the following security issues. I think am missing

something, what are the possible patterns to call a web service from the CLR Stored procedure.



Thank you



---------------------------------------

The following is the error that is happening each

time I call the stored procedure


A .NET Framework error occurred during execution of

user defined routine or aggregate

'MyStoredProcedure':
System.Security.SecurityException: Request for the

permission of type 'System.Net.WebPermission, System,

Version=2.0.0.0, Culture=neutral,

PublicKeyToken=b77a5c561934e089' failed.
System.Security.SecurityException:
at System.Security.CodeAccessSecurityEngine.Check

(Object demand, StackCrawlMark& stackMark, Boolean

isPermSet)
at System.Security.CodeAccessPermission.Demand()
at System.Net.HttpWebRequest..ctor(Uri uri,

ServicePoint servicePoint)
at System.Net.HttpRequestCreator.Create(Uri Uri)
at System.Net.WebRequest.Create(Uri requestUri,

Boolean useUriBase)
at System.Net.WebRequest.Create(Uri requestUri)
at

System.Web.Services.Protocols.WebClientProtocol.GetWe

bRequest(Uri uri)
at

System.Web.Services.Protocols.HttpWebClientProtocol.G

etWebRequest(Uri uri)
at

System.Web.Services.Protocols.SoapHttpClientProtocol.

GetWebRequest(Uri uri)
at

System.Web.Services.Protocols.SoapHttpClientProtocol.

Invoke(String methodName, Object[] parameters)
at MyWebServiceProxy.HelloWorld()
at MyStoredProcedure()

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Jan 21, 2004

Does anyone know how you can distribute Stored Procedures that work with a third party application but keep the contents / code of those Stored Procedures from being viewed and edited by the end users who have purchased the application as well as own and operate the SQL Server??

Thanks

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Apr 30, 2008

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I assume this is security related however, all the relevant security is set correctly as far as I can tell. I am granting "Execute" access for the stored procedure and "Select" access for all the referenced tables. Am I missing something? Is there another security setting which needs to be set?

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Jul 20, 2005

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Jul 20, 2005

Dear GroupI'm having two stored procedures, sp_a and sp_bContent of stored procedure A:CREATE PROCEDURE dbo.sp_aSELECT * FROM aGOContent of stored procedure B:CREATE PROCEDURE dbo.sp_bSELECT * FROM bGOI have created a user that has execute permissions for both procedures.When I run procedure A, all works fine but when running procedure B I'mgetting an error saying that the user must have SELECT permissions on tableB.Both tables are owned by dbo, and the security role for the user doesn't hasany SELECT permission on table a and b.I'd be grateful if anyone could point me in a direction why this error mightcome up for procedure B but not for A,with a possible solution without giving the user SELECT permissions.Thanks very much for your help!Martin

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Jul 20, 2005

Dear GroupI have found that table A had SELECT permissions for 'Public' but not tableB.Giving 'Public' SELECT permissions on table B did the trick.HOWEVER, I don't want anyone to be able to do a direct SELECT on table A orB but only give them access to the data by using the stored procedures. Isthere any way this can be set up?Thanks for your efforts!Have a nice day!Martin"Martin Feuersteiner" <theintrepidfox@hotmail.com> wrote in message news:...[color=blue]> Dear Group>> I'm having two stored procedures, sp_a and sp_b>> Content of stored procedure A:> CREATE PROCEDURE dbo.sp_a> SELECT * FROM a> GO>> Content of stored procedure B:> CREATE PROCEDURE dbo.sp_b> SELECT * FROM b> GO>> I have created a user that has execute permissions for both procedures.> When I run procedure A, all works fine but when running procedure B I'm> getting an error saying that the user must have SELECT permissions on> table B.>> Both tables are owned by dbo, and the security role for the user doesn't> has any SELECT permission on table a and b.> I'd be grateful if anyone could point me in a direction why this error> might come up for procedure B but not for A,> with a possible solution without giving the user SELECT permissions.>> Thanks very much for your help!>> Martin>[/color]

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Oct 20, 2007

Hi all .
I am going to consult you about a security concept .
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Thanks in advance.

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Jan 26, 2007

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Jun 25, 2006



CLR function has the following few lines which is invoked from Internal Activation Stored Procedure:

SqlCommand command = Connection.CreateCommand();

command.CommandText = "CREATE ASSEMBLY " + """ + AsmName + """ +" AUTHORIZATION [dbo]"+ " FROM " + "'" + regasm.UncPath + "'" + " WITH PERMISSION_SET=SAFE";

command.ExecuteNonQuery();

I am getting the following error:

"Could not impersonate the client during assembly file operation."

The CLR function is invoked from Service Broker internal activation stored procedure.

"SELECT user_name()" returns dbo just before CREATE ASSEMBLY execution.

SqlContext.WindowsIdentity.Name is "NT AUTHORITYSYSTEM" as the Data Engine runs with the LocalSystem account.

How do I create a the necessary security context for "CREATE ASSEMBLY" to succeed ?

Service Broker Queue activation with EXECUTE AS = "SELF", "OWNER", domain account or dbo, all result in the above error. The Service Broker assembly having the internal activation stored procedure is registered "unsafe".

Many Thanks.

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Jul 31, 2007



Hi,


I have posted this issue for a week, haven't got any reply yet, I posted it again and desperately need your help.


The article http://msdn2.microsoft.com/en-us/library/ms365343.aspx says:
Model Item Security can be set for differnt security filters, but when I use SQL Server Management Studio to set Model Item Security, it seems "Permissions" property surpass "Model Item Security" property. -- My report server is using Custom Authentication.



For example, in "Permissions" property of the model, if I checked "Use these roles for each group or user account" without setting any user or group, no matter what users I added to "Model Item Security" with "Secure individual model items independently for this model" checked, NO one user can see the model on report manager and report builder;

in above situation, if I added "user1" and gave role such as "Browser" role to "user1" in "Permissions" property, if I checked "Secure individual model items independently for this model" in "Model Item Security" property, even I did NOT grant "user1" to root model and any entities under the model, the "user1" is able to access the model and all entities in report builder.



My question is on the same report model, how to set "AdminFilter" (empty security filter) for administrator permissions and set "GeneralFilter" (filtered on UserID) for general user based on their UserID?


The article also says:

"Security filters are always applied, even for users who have Content Manager or Administrator permissions to the model. To allow administrators or other users to see all rows of an entity on which row-level security is defined, you can create an empty security filter (which always returns True) and then use the filter to grant those users access to all the rows."



So I defined 2 filters "GeneralFilter" and "AdminFilter" for "Staff" entity for my report model "SSRSModel", I expect after I deployed the report model, the administrator users use report builder to build reports with all rows available, and the non-admin users can only see rows based on their UserID.



I can only get one result at a time but not both:

either the rows are filtered or not filtered at all, no matter how I set the "SecurityFilter" for the entity: I tried setting both "AdminFilter" and "GeneralFilter" for SecurityFilter at the same time, combination of "DefaultSecurityFilter" and "SecurityFilter", or one at a time.



Your help is highly appreciated!

Desperate developer

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Differance Between Persist Security Info And Integrated Security

Apr 26, 2007

hi i want to know what is the differance between  
Persist Security Info=False;Integrated Security=Yes;

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