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I need a way to programmaticly retrieve a sid when given a users full nt login by querying AD.

Posted on 2008-06-09
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Last Modified: 2013-12-04
I have a database that is populated with user names "domain\user"

I need a way to query AD and select a users SID based on their login name.

I am then going to take the SID given by AD and write that information back to the database.

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Question by:davidrickey
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virtuatech earned 250 total points
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by:davidrickey
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That would be great if i could access the program through vb.  Since you posted I have been trying to find a way to execute the psgetsid application and return the value back to my application for the database update.

Is there an easy way to interface psgetsid with my application?
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by:jkr
jkr earned 250 total points
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Why not using 'LookupAccountName()' (http://msdn.microsoft.com/en-us/library/aa379159(VS.85).aspx) to query the SID? See http://support.microsoft.com/kb/286182 ("How To Use Microsoft Visual Basic to Convert a Raw SID into a String SID") for an an example on how to use that function.
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by:davidrickey
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jkr,
Before your last post I found this on the internet.  Slightly modified, I was able to use it to do exactly what I needed.  Thanks for responding.
private void button1_Click(object sender, EventArgs e)

        {

            SqlDataReader dr;

            string qry = "select ntaccount from tiuser where  (sid = '' or sid is null) and (not ntaccount is null and not ntaccount = '') order by ntaccount";

            SqlConnection con = new SqlConnection("ConnectionString");
 

            SqlCommand cmd = new SqlCommand(qry, con);
 

            try

            {

                con.Open();

                dr = cmd.ExecuteReader();

                while (dr.Read())

                {

                    writeData(GetSid(dr.GetString(0)), dr.GetString(0));

                }

            }

            catch { }
 

        }
 

        private string GetSid(string strLogin)

        {

            string str = "";

            // Parse the string to check if domain name is present.

            int idx = strLogin.IndexOf('\\');

            if (idx == -1)

            {

                idx = strLogin.IndexOf('@');

            }
 

            string strDomain;

            string strName;
 

            if (idx != -1)

            {

                strDomain = strLogin.Substring(0, idx);

                strName = strLogin.Substring(idx + 1);

            }

            else

            {

                strDomain = Environment.MachineName;

                strName = strLogin;

            }
 
 

            DirectoryEntry obDirEntry = null;

            try

            {

                Int64 iBigVal = 5;

                Byte[] bigArr = BitConverter.GetBytes(iBigVal);

                obDirEntry = new DirectoryEntry("WinNT://" +

                                      strDomain + "/" + strName);

                System.DirectoryServices.PropertyCollection

                                   coll = obDirEntry.Properties;

                object obVal = coll["objectSid"].Value;

                if (null != obVal)

                {

                    str = this.ConvertByteToStringSid((Byte[])obVal);

                }
 

            }

            catch (Exception ex)

            {

                str = "";

                //Trace.Write(ex.Message);

            }

            return str;

        }
 

        private string ConvertByteToStringSid(Byte[] sidBytes)

        {

            StringBuilder strSid = new StringBuilder();

            strSid.Append("S-");

            try

            {

                // Add SID revision.

                strSid.Append(sidBytes[0].ToString());

                // Next six bytes are SID authority value.

                if (sidBytes[6] != 0 || sidBytes[5] != 0)

                {

                    string strAuth = String.Format

                        ("0x{0:2x}{1:2x}{2:2x}{3:2x}{4:2x}{5:2x}",

                        (Int16)sidBytes[1],

                        (Int16)sidBytes[2],

                        (Int16)sidBytes[3],

                        (Int16)sidBytes[4],

                        (Int16)sidBytes[5],

                        (Int16)sidBytes[6]);

                    strSid.Append("-");

                    strSid.Append(strAuth);

                }

                else

                {

                    Int64 iVal = (Int32)(sidBytes[1]) +

                        (Int32)(sidBytes[2] << 8) +

                        (Int32)(sidBytes[3] << 16) +

                        (Int32)(sidBytes[4] << 24);

                    strSid.Append("-");

                    strSid.Append(iVal.ToString());

                }
 

                // Get sub authority count...

                int iSubCount = Convert.ToInt32(sidBytes[7]);

                int idxAuth = 0;

                for (int i = 0; i < iSubCount; i++)

                {

                    idxAuth = 8 + i * 4;

                    UInt32 iSubAuth = BitConverter.ToUInt32(sidBytes, idxAuth);

                    strSid.Append("-");

                    strSid.Append(iSubAuth.ToString());

                }

            }

            catch (Exception ex)

            {

                //Trace.Warn(ex.Message);

                return "";

            }

            return strSid.ToString();

        }
 

        private void writeData(string SID, string user)

        {

            SqlDataAdapter da = new SqlDataAdapter();

            SqlConnection con = new SqlConnection("ConnectionString");

            string qry = "UPDATE TIUSER SET SID = '" + SID + "' WHERE (NTACCOUNT = '" + user + "')";

            da.UpdateCommand = new SqlCommand(qry, con);
 

            try

            {

                con.Open();

                da.UpdateCommand.ExecuteNonQuery();
 

            }

            catch{}

            con.Close();

        

        }

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