ReturnAuthRequiredIfAuthUserDenied Property of the IFPCWebListenerProperties Interface

Article
08/13/2010

The ReturnAuthRequiredIfAuthUserDenied property gets or sets a Boolean value that indicates whether to return a Proxy Authentication Required message when a user is authenticated by the Forefront TMG Web proxy but is denied access by the rules. By default, an access denied message is returned, and the user is not given the option of authenticating with different credentials.

C++

HRESULT put_ReturnAuthRequiredIfAuthUserDenied(
    VARIANT_BOOL fReturnAuthRequiredIfAuthUserDenied
);
HRESULT get_ReturnAuthRequiredIfAuthUserDenied(
    VARIANT_BOOL** pfReturnAuthRequiredIfAuthUserDenied
);

Parameters

fReturnAuthRequiredIfAuthUserDenied
Boolean value that indicates whether to return a Proxy Authentication Required message when a user is authenticated by the Web proxy but is denied access by the rules.
pfReturnAuthRequiredIfAuthUserDenied
Pointer to a Boolean variable that is set on return to VARIANT_TRUE if a Proxy Authentication Required message will be returned when a user is authenticated by the Web proxy but is denied access by the rules, or to VARIANT_FALSE if a Proxy Authentication Required message will not be returned when a user is authenticated by the Web proxy but is denied access by the rules.

Return Value

These property methods return S_OK if the call is successful; otherwise, they return an error code.

Visual Basic

Property ReturnAuthRequiredIfAuthUserDenied As Boolean

Property Value

Boolean value that indicates whether to return a Proxy Authentication Required message when a user is authenticated by the Web proxy but is denied access by the rules.

Example Code

This VBScript script sets the ReturnAuthRequiredIfAuthUserDenied property of the Internal network's Web listener to True or False according to the value supplied by the user.


'Define the constants needed
Const fpcInternalNetwork = 4
Main(WScript.Arguments)
Sub Main(args)
    Dim reqValue    ' A string
    Dim newValue    ' A Boolean
    
    If(1 <> args.Count) Then
        Usage()
    End If
    reqValue = UCase(args(0))
    If (reqValue = "TRUE" Or reqValue = "FALSE") Then
        If reqValue = "TRUE" Then
            newValue = True
        Else
            newValue = False
        End If
        SetNetworkReturnAuthReq newValue
    Else
        Usage()
    End If
End Sub
Sub SetNetworkReturnAuthReq(newValue)
    ' Declare the objects needed.
    Dim root          ' The FPCLib.FPC root object
    Dim isaArray      ' An FPCArray object
    Dim networks      ' An FPCNetworks collection
    Dim network       ' An FPCNetwork object
    Dim currentValue  ' A Boolean
    ' Create the root object.
    Set root = CreateObject("FPC.Root")
    ' Get references to the array object 
    ' and the networks collection.
    Set isaArray = root.GetContainingArray()
    Set networks = isaArray.NetworkConfiguration.Networks
    ' Find the Internal network and set the property
    ' for it.
    For Each network In networks
        If network.NetworkType = fpcInternalNetwork Then
            currentValue = network.WebListenerProperties.ReturnAuthRequiredIfAuthUserDenied
            WScript.Echo "Current value: " & currentValue
            If newValue <> currentValue Then
                network.WebListenerProperties.ReturnAuthRequiredIfAuthUserDenied = newValue
                WScript.Echo "New value: " _
                    & network.WebListenerProperties.ReturnAuthRequiredIfAuthUserDenied
                network.Save
                WScript.Echo "Done!" 
            End If
        End If
    Next
End Sub
Sub Usage()
    WScript.Echo "Usage:" & VbCrLf _
        & "  " & WScript.ScriptName & " {True | False}"
    WScript.Quit
End Sub

Remarks

This property is read/write. Its default value is False (VARIANT_FALSE in C++).

In the forward proxy scenario, when this property is set to True (VARIANT_TRUE in C++), a user that is authenticated by the Web proxy but fails to pass the rules (for example, because they deny access to this user) receives HTTP error 407 (Proxy Authentication Required) and can try again using different credentials. If this property is set to False (VARIANT_FALSE in C++) (the default value), the user receives HTTP error 502 (Bad Gateway) with a resource denied error page and is not prompted again for credentials when the Web proxy denies access for a request. In the reverse proxy scenario, the corresponding HTTP errors are 401 (Unauthorized: Logon Failed) and 403 (Forbidden: Execute Access Forbidden).

This property cannot be accessed through Forefront TMG Management.

Requirements

Client	Requires Windows 7 or Windows Vista.
Server	Requires Windows Server 2008 R2 or Windows Server 2008 x64 Edition with SP2.
Version	Requires Forefront Threat Management Gateway (TMG) 2010.
IDL	Declared in Msfpccom.idl.
DLL	Requires Msfpccom.dll.

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