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9.2

SQL caching authentication in SharePoint Web Application

Asked by TriadX1 in Internet Security, Web Browsers, WebApplications

Tags: C#, SharePoint, SSO, impersonation, SQL Server.

We need some urgent help on a SQL authentication issue.  Let me explain.

We have a 3rd party SQL Server 2008 Database where we need to do simple reads writes etc as a specific Windows user.  (This needs to use windows authentication as it does internal user validation using select SYSTEM_USER and that cannot be changed.) This is code is in a SharePoint WebPart.  

Since the SQL server is remote, we get the Windows credentials for it using SSO.  This all works great.  But the problem we are having is that it appears the SQL Server, once it has authentication, is not requesting authentication again when a different users logs in.  Ie.  I open the browser, get a windows authentication prompt.  Log in as User-A.  It shows that I am logged in as User-A.  When I read the user from SQL (select SYSTEM_USER), it returns User-A.  All is good. Then I close the browser, open a new browser session, get a windows prompt, log in as User-B.  the code show that I am impersonating User-B in the while it access the database, but SQL (select SYSTEM_USER ) says I am still User-A...  In a multi-user application this just can't happen. I need it to authenticate on every connection. Here is some data that may help you out:

Here is our hardware/software configuration:

SharePoint 2007 Server on Windows Server 2008

SQL Server 2008 on Windows Server 2008

We have SSO enabled and working on the SharePoint Server to authenticate to this external SQL using Windows Authentication. This works fine.

Our Web Config has: <identity impersonate="true" />

The connection string we are using is:

<add name="OurConnectionString" connectionString="Data Source=ServerName;Initial Catalog=DatabaseName;Trusted_Connection=True;" providerName="System.Data.SqlClient" />

We are using impersonation in our C# code to change the user while making any connection/reads/write etc to the external database, then the object is destroyed.  We have created an Ours.SSO which simply gets the credentials for the current user from the database which is then used by the impersonation.  It works fine and is getting the correct credentials.  I am not including the piece where it gets the SSO credentials (and url to a form if the credentials don't exist when the user can enter them) as it is irrelevant, since SSO is returning the correct domain/user/password, and impersonation is using this user. I have included some test code:
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint.Portal;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using Our.SSO;
using Microsoft.SharePoint.Utilities;
using System.Web;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
 
namespace ADOTest
{
    public class ADOTesting : System.Web.UI.Page
    {
        protected Button btnDemo;
        private SPWeb _myTeamSite;
        protected TextBox txtUpdate;
        protected TextBox txtDelete;
 
        protected override void OnPreInit(EventArgs e)
        {
            base.OnPreInit(e);
            string pageName = Page.AppRelativeVirtualPath.Substring(
                 Page.AppRelativeVirtualPath.LastIndexOf('/') + 1);
 
            _myTeamSite = SPControl.GetContextWeb(Context);
            MasterPageFile = _myTeamSite.MasterUrl;
 
        }
 
        protected void onSelectClick(object sender, EventArgs e)
        {
            if (SSOValidation.UseSSO())
            {
                SSOUserCredentials cred = SSOUserCredentials.GetUserCredentials(ConfigurationManager.AppSettings["SqlApplicationDefinition"]);
                if (cred != null && cred.NotFoundUrl == null)
                {
                    Response.Write("<br>Before Impersonation Thread UserName " + System.Threading.Thread.CurrentPrincipal.Identity.Name);
                    Response.Write("<br>Before Impersonation  HttpContext UserName " + HttpContext.Current.User.Identity.Name);
                    using (new Impersonator(cred.UserName, cred.Domain, cred.Password, SSOValidation.SqlServerIsLocal() ? LogonType.LOGON32_LOGON_NETWORK : LogonType.LOGON32_LOGON_NEW_CREDENTIALS, LogonProvider.LOGON32_PROVIDER_WINNT50))
                    {
                        Response.Write("SSO UserName " + cred.UserName);
                        Response.Write("<br>Thread UserName " + System.Threading.Thread.CurrentPrincipal.Identity.Name);
                        Response.Write("<br> HttpContext UserName " + HttpContext.Current.User.Identity.Name);
                        SelectSqlTest ();
                    }
                    Response.Write("<br>After Impersonation Thread UserName " + System.Threading.Thread.CurrentPrincipal.Identity.Name);
                    Response.Write("<br>After Impersonation  HttpContext UserName " + HttpContext.Current.User.Identity.Name);
                }
                else if (cred != null && cred.NotFoundUrl != null)
                {
                    SPUtility.Redirect(cred.NotFoundUrl, SPRedirectFlags.UseSource, HttpContext.Current);
                }
            }
            else
            {
                SelectSqlTest();
            }
        }
 
        protected void onInsertClick(object sender, EventArgs e)
        {
            if (SSOValidation.UseSSO())
            {
                SSOUserCredentials cred = SSOUserCredentials.GetUserCredentials(ConfigurationManager.AppSettings["SqlApplicationDefinition"]);
                if (cred != null && cred.NotFoundUrl == null)
                {
                    using (new Impersonator(cred.UserName, cred.Domain, cred.Password, SSOValidation.SqlServerIsLocal() ? LogonType.LOGON32_LOGON_NETWORK : LogonType.LOGON32_LOGON_NEW_CREDENTIALS, LogonProvider.LOGON32_PROVIDER_WINNT50))
                    {
                        InsertSqlTest ();
                    }
                }
                else if (cred != null && cred.NotFoundUrl != null)
                {
                    SPUtility.Redirect(cred.NotFoundUrl, SPRedirectFlags.UseSource, HttpContext.Current);
                }
            }
            else
            {
                InsertSqlTest();
            }
        }
 
        protected void onUpdateClick(object sender, EventArgs e)
        {
            if (SSOValidation.UseSSO())
            {
                SSOUserCredentials cred = SSOUserCredentials.GetUserCredentials(ConfigurationManager.AppSettings["SqlApplicationDefinition"]);
                if (cred != null && cred.NotFoundUrl == null)
                {
                    using (new Impersonator(cred.UserName, cred.Domain, cred.Password, SSOValidation.SqlServerIsLocal() ? LogonType.LOGON32_LOGON_NETWORK : LogonType.LOGON32_LOGON_NEW_CREDENTIALS, LogonProvider.LOGON32_PROVIDER_WINNT50))
                    {
                        UpdateSqlTest ();
                    }
                }
                else if (cred != null && cred.NotFoundUrl != null)
                {
                    SPUtility.Redirect(cred.NotFoundUrl, SPRedirectFlags.UseSource, HttpContext.Current);
                }
            }
            else
            {
                UpdateSqlTest();
            }
        }
 
        protected void onDeleteClick(object sender, EventArgs e)
        {
            if (SSOValidation.UseSSO())
            {
                SSOUserCredentials cred = SSOUserCredentials.GetUserCredentials(ConfigurationManager.AppSettings["SqlApplicationDefinition"]);
                if (cred != null && cred.NotFoundUrl == null)
                {
                    using (new Impersonator(cred.UserName, cred.Domain, cred.Password, SSOValidation.SqlServerIsLocal() ? LogonType.LOGON32_LOGON_NETWORK : LogonType.LOGON32_LOGON_NEW_CREDENTIALS, LogonProvider.LOGON32_PROVIDER_WINNT50))
                    {
                        DeleteSqlTest ();
                    }
                }
                else if (cred != null && cred.NotFoundUrl != null)
                {
                    SPUtility.Redirect(cred.NotFoundUrl, SPRedirectFlags.UseSource, HttpContext.Current);
                }
            }
            else
            {
                DeleteSqlTest();
            }
        }
 
 
 
        private void SelectSqlTest()
        {
            try
            {
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["HillyardCCAPConnectionString"].ToString());
                SqlCommand command = new SqlCommand("select SYSTEM_USER", con);
                con.Open();
                Response.Write("<br>Connection String " + con.ConnectionString);
                SqlDataReader reader = command.ExecuteReader();
 
                while (reader.Read())
                {
                    Response.Write("<p>" + reader[0].ToString() + "</p>");
                }
                con.Close();
            }
            catch (Exception x)
            {
                Response.Write("<p>" + x.Message + "</p>");
            }
        }
 
        private void InsertSqlTest()
        {
            try
            {
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["HillyardCCAPConnectionString"].ToString());
 
                string insertStatement = string.Format("INSERT INTO tbl_Users (usrNmSh, usrNm, usrNmMdl, usrIsSys, usrSysUsr, usrPhn1, usrPhn2, usrPhnCls1VldlstID, usrPhnCls2VldlstID, usrEml ) VALUES ( '{0}', '{1}', '{2}', {3}, '{4}', '{5}', '{6}', {7}, {8}, '{9}' )","UserNameShort","UserName","UserNmMDL",0,"InsertedUser","","",0,0,"mail@nuvek");
 
                SqlCommand command = new SqlCommand(insertStatement, con);
                con.Open();
                SqlDataReader reader = command.ExecuteReader();
 
                while (reader.Read())
                {
                    Response.Write("<p>" + reader[0].ToString() + "</p>");
                }
 
                con.Close();
 
            }
            catch (Exception x)
            {
                Response.Write("<p>" + x.Message + "</p>");
            }
        }
 
        private void UpdateSqlTest()
        {
            try
            {
                string updateStatement = string .Format ("UPDATE tbl_Users SET usrNmSh = '{0}', usrNm = '{1}', usrNmMdl = '{2}' WHERE usrID = {3}","UpdatedNameshort","UpdatedName","UpdatedMiddleName",txtUpdate .Text );
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["HillyardCCAPConnectionString"].ToString());
                SqlCommand command = new SqlCommand(updateStatement, con);
                con.Open();
                SqlDataReader reader = command.ExecuteReader();
 
                while (reader.Read())
                {
                    Response.Write("<p>" + reader[0].ToString() + "</p>");
                }
 
                con.Close();
 
            }
            catch (Exception x)
            {
                Response.Write("<p>" + x.Message + "</p>");
            }
        }
 
 
 
        private void DeleteSqlTest()
        {
            try
            {
                string deletestatement = string.Format ("UPDATE tbl_Users SET usrDelSts = 1 WHERE [usrID] = {0}", txtDelete.Text);
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["HillyardCCAPConnectionString"].ToString());
                SqlCommand command = new SqlCommand(deletestatement, con);
                con.Open();
                SqlDataReader reader = command.ExecuteReader();
 
                while (reader.Read())
                {
                    Response.Write("<p>" + reader[0].ToString() + "</p>");
                }
 
                con.Close();
 
            }
            catch (Exception x)
            {
                Response.Write("<p>" + x.Message + "</p>");
            }
        }
 
 
    }
 
}
 
--------------------------------------------- Impersonator [From Metadata]-----------------------
 
using System;
 
namespace Our.SSO
{
    public class Impersonator : IDisposable
    {
        public Impersonator();
        public Impersonator(string userName, string domainName, string password);
        public Impersonator(string userName, string domainName, string password, LogonType logonType, LogonProvider logonProvider);
 
        public void Dispose();
        public void Impersonate(string userName, string domainName, string password);
        public void Impersonate(string userName, string domainName, string password, LogonType logonType, LogonProvider logonProvider);
    }
}
[+][-]08/07/09 10:54 AM, ID: 25045335Expert Comment

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[+][-]08/07/09 11:11 AM, ID: 25045460Author Comment

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[+][-]08/07/09 11:44 AM, ID: 25045779Accepted Solution

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About this solution

Zones: Internet Security, Web Browsers, WebApplications
Tags: C#, SharePoint, SSO, impersonation, SQL Server.
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Solution Provided By: mcdown75
Participating Experts: 1
Solution Grade: A
 
 
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