Solved

Converting Octet String from Active Directory

Posted on 2006-10-30
3
3,655 Views
Last Modified: 2009-09-18
I am working with AD in C#.

I wrote a simple little app that allows people to search users in AD.

I have the objectSid (SID) coming back as a poperty, and I need to store that data in a database. Later in the app, I will want to search AD using that SID stored.

My problem is converting objectSid ( guessing it's an octec string) to a string value to store it and then converting it back when I need to search with it.

Anyone been down the road with AD and C#

Thanks,
0
Comment
Question by:scaldwe
3 Comments
 
LVL 10

Accepted Solution

by:
jnhorst earned 500 total points
ID: 17838984
I am thinking your user object should be castable to an instance of the IADsUser interface, which has a get_GUID method.  You might want to look at storing that and using it later to search with it.

John
0
 

Author Comment

by:scaldwe
ID: 17842854
Thank You for the reply,  this is what I was looking for ...

using the namespace "System.Security.Principal"

    private String ConvertSID(Byte[] sidBinary)
    {
        SecurityIdentifier SID = new SecurityIdentifier(sidBinary, 0);
        return SID.ToString();
    }

returns me a nice little Unique String I can search on ....

Here is the actual code block this applies to ... maybe this can help someone get their a little faster if they are tasked with this as well.

//Define Search String .. ex: "(&(objectClass=user)(sn=sp*)(objectCategory=person))"
        StringBuilder objS = new StrinBuilder(500);
        objS.Append("(&(objectClass=user)(sn=");
        objS.Append(txtSearchCriteria.Text.Trim());
        objS.Append("*)(objectCategory=person))");
       

        DirectorySearcher objSearcher = new DirectorySearcher("LDAP://yourdomain/");
        objSearcher.Filter = objS.ToString();
        objSearcher.PropertiesToLoad.Add("sn");
        objSearcher.PropertiesToLoad.Add("givenName");
        objSearcher.PropertiesToLoad.Add("objectSid"); //returns as an octet string so you must convert it.

        SearchResult objResults;
        SearchResultCollection objResultCollection = objSearcher.FindAll();

        //Now to grab the values I set to Load with the PopertiestoLoad method ...
        String firstName = (String)objResults.Properties["givenName"][0];
        String lastName = (String)objResults.Properties["sn"][0];
        String SID = ConvertSID((Byte[])objResults.Properties["objectSid"][0];

Hope this helps someone ....




0
 

Expert Comment

by:CareCentric
ID: 25369395
For anyone interested, I had to do the reverse of this: finding all users that belong to a group, even if they are listed as primary group member. (I excluded 513 which is the default "Domain Users" group).
if (sr.Properties["name"] == null) continue;
if (sr.Properties["name"].Count == 0) continue;
string name = (string)sr.Properties["name"][0];
string gSID = ConvertSID((Byte[])sr.Properties["objectSid"][0]);
string rSID = gSID.Substring(gSID.LastIndexOf('-') + 1);
int irSID = 0;
int.TryParse(rSID, out irSID);
ResultPropertyValueCollection member = sr.Properties["member"];
List<string> members = new List<string>();
foreach (string i in member)
{
  members.Add(i);
}
if (irSID == 0 || rSID != "513")
{
  DirectorySearcher dsearch2 = new DirectorySearcher();
  SearchResultCollection sResult2;
  dsearch2.PageSize = 500;
  dsearch2.SizeLimit = 500;
  dsearch2.ReferralChasing = ReferralChasingOption.All;
  dsearch2.SearchScope = SearchScope.Subtree;
  dsearch2.Filter = "(&(primaryGroupID=" + rSID + "))";
  dsearch2.SearchRoot = new DirectoryEntry("LDAP://DC=contoso,DC=com");
  sResult2 = dsearch2.FindAll();
  foreach (SearchResult sr2 in sResult2)
  {
    members.Add(sr2.Path.Substring(7));
  }
}

Open in new window

0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article shows how to use the open source plupload control to upload multiple images. The images are resized on the client side before uploading and the upload is done in chunks. Background I had to provide a way for user…
Problem Hi all,    While many today have fast Internet connection, there are many still who do not, or are connecting through devices with a slower connect, so light web pages and fast load times are still popular.    If your ASP.NET page …
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, just open a new email message. In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…

815 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now