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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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4 Comments
 
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virtuatech earned 250 total points
ID: 21745664
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by:davidrickey
ID: 21752198
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
ID: 21753341
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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Author Comment

by:davidrickey
ID: 21753860
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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