Re: [FreeRDP-devel] Using DVC channels from logon screen

[FORT D. <dav...@or...>]

Le 16/09/2014 20:14, Bernhard Miklautz a écrit :
> Hi Thomas,
>
> On Tue, Sep 16, 2014 at 06:44:52PM +0200, Thomas Calderon wrote:
>> This happens when you connect to the RDP server using legacy "rdp" mode.
>> The graphical logon screen is displayed and my plugin code runs. The issue
>> is that very early in the client code, I have an "Invalid descriptor" error
>> when using WTSVirtualChannelOpenEx.
> did GetLastError give any further details?
>
>> I am wondering if you are allowed to use DVCs while the user has not yet
>> authenticated himself.
>> Could anyone confirm this ?
> Interesting question.
> Not sure if it's allowed or not but I could imagine that if the dynamic
> virtual channel (drdynvc) is not (yet) loaded the open call will fail.
> Did you try to open the channel "delayed"? - E.g. if you get an invalid
> handle wait for some time and retry opening?
I'd tend to say that there's no reason why you couldn't open the DVC
while not authenticated. I don't think the spec say anything about this
(the spec doesn't even contain the authenticated word), but perhaps the
implementation (microsoft RDP server) is doing its own assertions.

Regards.

PS: did anyone has seen that packet
http://msdn.microsoft.com/en-us/library/cc240636.aspx sent, as it may be
an indication that the user is logged on ?