How to fetch groupmembership attribute from Oracle LDAP server(OID) using VBScript? - vbscript

Question

I am using a VBScript to do an authentication between my application with OID(Oracle Identity Directory) using an LDAP script. I am successfull in doing authentication. The next step involved is fetching all the groups that user is belonging to and map with the groups in my application. For some reasons I am not able to fetch the group information from the LDAP server. I know the attribute I should query is "groupmembership". But I am not able to get any values from this attribute. Any help on this is required. Here is a code snippet of what I have -
'ldapauth.vbs
'Version: 1.0
'Use: c:\cscript ldapauth.vbs <userName> [<password>]
'Ex - Anonymous: c:\>cscript ldapauth.vbs svc_testconsona
'Ex - Authenticated: c:\>cscript ldapauth.vbs svc_testconsona wipro#123
Dim oUser 'LDAP object holding user info
Dim oDSP 'Directory Service Provider
Dim oArgs 'Command line arguments
Dim sCN 'search parameter - LDAP attribute: CN
Dim sPWD 'CN's password parameter
Dim sRoot 'Holds the root of the LDAP object
Dim sDN 'Distinguished Name of authenticating account
Dim sLDAPsrv 'LDAP server
Dim sLDAPsb 'LDAP search base
Dim bAuthQuery 'Query Type - True=Authenticated, False=Anonymous
CONST ADS_SECURE_AUTHENTICATION = &H0001
CONST ADS_USE_ENCRYPTION = &H0002
CONST ADS_USE_SSL = &H0002
CONST ADS_READONLY_SERVER = &H0004
CONST ADS_NO_AUTHENTICATION = &H0010
CONST ADS_FAST_BIND = &H0020
CONST ADS_USE_SIGNING = &H0040
CONST ADS_USE_SEALING = &H0080
CONST ADS_USE_DELEGATION = &H0100
CONST ADS_SERVER_BIND = &H0200
Const ADS_PROPERTY_NOT_FOUND = &h8000500D
sLDAPsrv = "myserver.domain.com:389"
sLDAPsb = "ou=Active,o=CMI"
'Get the command line args
set oArgs=WScript.Arguments
'Check command line args
On Error Resume Next
sCN = oArgs.item(0) 'username
If Err.Number <> 0 Then
Echo ""
Echo "**** ERROR: No username supplied."
Echo ""
Echo "Use: c:\>cscript ldapauth.vbs <userName> [<password>]"
Echo ""
Echo "Aborting..."
Echo ""
WScript.Quit
End If
sRoot = "LDAP://" & sLDAPsrv & "/cn=" & sCN & "," & sLDAPsb
sDN = "cn=" & sCN & "," & sLDAPsb
wscript.echo "the query is:"
wscript.echo sRoot
On Error Resume Next
sPWD = oArgs.item(1) 'password
If Err.Number <> 0 Then 'This will be a non-authenticated query
bAuthQuery = False
Echo ""
Echo "Performing anonymous LDAP query..."
Echo ""
Else 'This will be an authenticated query
bAuthQuery = True
Echo ""
Echo "Performing authenticated LDAP query..."
Echo ""
End If
'Done checking command line args
'Set directory service provider
Set oDSP = GetObject("LDAP:")
'Perform requested type of query - anonymous or authenticated
If bAuthQuery Then 'authenticated query requested
'Set the LDAP object query
On Error Resume Next
Set oUser = oDSP.OpenDSObject(sRoot,sDN,sPWD,ADS_SERVER_BIND)
If Err.Number <> 0 Then
If Err.Number = "-2147023570" Then
Echo "**** ERROR: Authentication failed. Check username, password and search base."
ElseIf Err.Number = "-2147016646" Then
Echo "**** ERROR: LDAP server not found."
Else
Echo "**** ERROR: Unable to bind to LDAP server. " & Err.Number
End If
Echo ""
Echo "Use: c:\>cscript ldapauth.vbs <username> <password>"
Echo ""
Echo "Aborting..."
Echo ""
WScript.Quit
End If
Else 'anonymous query requested
'Set the LDAP object query
On Error Resume Next
Set oUser = oDSP.OpenDSObject(sRoot,vbNullString,vbNullString,ADS_SERVER_BIND AND ADS_NO_AUTHENTICATION)
If Err.Number <> 0 Then
If Err.Number = "-2147016656" Then
Echo "**** ERROR: Username not found."
ElseIf Err.Number = "-2147016646" Then
Echo "**** ERROR: LDAP server not found."
Else
Echo "**** ERROR: Unable to bind to LDAP server. " & Err.Number
End If
Echo ""
Echo "Use: c:\>cscript ldapauth.vbs <username [<password>]"
Echo ""
Echo "Aborting..."
Echo ""
WScript.Quit
End If
End If
'Populate the user property cache
oUser.GetInfo
'Iterate through available user attributes
For count = 0 to (oUser.PropertyCount-1)
sAttribName = oUser.Item(CInt(count)).Name
-'This line fetches the attribute name poroperly. But values from groupmembership is not getting it.
if sAttribName = "groupmembership" then
sAttribVal = oUser.GetInfoEx(sAttribName)
else
sAttribVal = oUser.Get(sAttribName)
end if
If IsArray(sAttribVal) Then
For Each sMultiVal in oUser.GetEx(sAttribName)
sAttribList = sAttribList & sAttribName & Space(16-Len(sAttribName)) & ":: " & sMultiVal & vbCRLF
Next
Else
sAttribList = sAttribList & sAttribName & Space(16-Len(sAttribName)) & ": " & sAttribVal & vbCRLF
End If
sAttribName = ""
sAttribVal = ""
if err.number <> 0 then
err.Clear
end if
Next
Echo sAttribList
'Clean up
set oDSP=Nothing
set oUser=Nothing
wscript.Quit
Sub Echo(byref message)
WScript.Echo message
End Sub

Answer 1

OID doesn't normally have an attribute on a user called groupmembership (unless you added one yourself).
If you are trying to find the groups that a user is a member of, you have to do a second ldap search for the groups.
Groups in OID have either groupOfNames or groupOfUniqueNames as their object class. Each of these object classes has a multivalued attribute for storing the names of group members. When a user is assigned to a group, their DN is added to the respective multivalued attribute. In the groupOfNames object class, this multivalued attribute is member, and, in the groupOfUniqueNames object class, it is uniqueMember.