Problems with Smartcard reader passthrough using Rdesktop

Hi,
we're testing smart card passthrough from a Linux system to a virtual machine 
with Windows XP using Rdesktop, i.e. the application using the smart card 
runs inside the virtual machine.

Two smart card readers need to be supported, one is a Omnikey 3121 USB reader 
and the other a Chipdrive Micro 120 using a serial line. Unfortunately, both 
approaches fail; the smart cards are not detected in the Windows hardware 
device management inside the virtual machine. See below for details.

The drivers for the individual smart cards have been installed inside the 
Windows virtual machine and we've verified with a native Windows XP 
installation that they work (we used the Windows freeware tool "Chipcard 
Master" to read a German bank card). So, the problem must be somewhere in the 
way the smartcard devices are tunneled through rdesktop:

We're using rdesktop 1.6 based on the package from Debian unstable. It has 
been compiled with the following configure invocation:

./configure --host=i486-linux-gnu --build=i486-linux-gnu --prefix=/usr --mandir=\${prefix}/share/man -
-infodir=\${prefix}/share/info --with-ipv6 --enable-smartcard --with-debug-smartcard

PS/SC Lite 1.5.5 was used on the Linux side with the CCID driver 1.3.8 as the 
PS/SC driver for the Omnikey reader.

1. Omnikey 3121 (USB)
The smart card reader seems to be properly detected on the Linux side. 
pcsc_scan finds the reader and inserting the bank card shows status messages 
about "Card removed" and "Card inserted, Unresponsive card"

We're starting rdesktop with the following command. The "Win name" is the name 
the card reader had by default in the native Windows installation.

rdesktop -r scard:"OmniKey CardMan 3121 00 00"="Cardman 3x21" 
$IP_ADDRESS_OF_VM

Static/aliased Device:
  Lin name: [OmniKey CardMan 3121 00 00]
  Win name: [Cardman 3x21]
  Vendor  : []
Autoselected keyboard map de
SCARD: SCardAccessStartedEvent()
SCARD: SCardEstablishContext()
SCARD: -> Success (context: 0x010321d3)
SCARD: SCardListReaders(context: 0x010321d3)
SCARD: -> Success
SCARD: SCardGetStatusChange(context: 0x010321d3, timeout: 0xffffffff, count: 
2)
SCARD:    "\\?PnP?\Notification"
SCARD:        user: 0x00000000, state: 0x00000001, event: 0x00000000
SCARD:            current state: 0x00000000
SCARD:    "OmniKey CardMan 3121 00 00"
SCARD:        user: 0x00000000, state: 0x00000010, event: 0x00000000
SCARD:            current state: 0x00000010
SCARD: SCardEstablishContext()
SCARD: -> Success (context: 0x01038765)
SCARD: SCardListReaders(context: 0x01038765)
SCARD: -> Success
SCARD: SCardListReaders(context: 0x01038765)
SCARD: -> Success

However, the Windows hardware detection doesn't detect the smart card reader 
and tools accessing the smart card reader (like the Omnikey test tool or 
Chipcard Master) don't find the reader either.

Are we using incorrect parameters? Does the above output indicate that the 
tunneling generally works? Is more needed to detect the reader in Windows?

2. Chipdrive Micro
rdesktop was launched with the following command:

rdesktop -r 'comport:COM1=/dev/ttyS0' $IPADDRESS-OF-VM

rdesktop emits a message "SERIAL COM1 to /dev/ttyS0". 

However, as with the PS/SC tunneling the Windows hardware detection doesn't 
detect the smart card reader and tools accessing the smart card reader (like 
the Chipcard Master) don't find the reader either.

Are we using incorrect parameters? Should raw tunneling of the serial line 
work or is something else needed to detect the smart card reader in Windows?

I tried to analyse the RDP session with Wireshark, but there doesn't seem to 
be a dissector yet, so I can't tell whether the respective channels are 
active at all.

Thanks in advance for your help, if you need further information I can provide 
them on request.

Cheers,
Moritz
-- 
Moritz Mühlenhoff
Open Source Software Engineer and Consultant

Univention GmbH
Linux for your business
Mary-Somerville-Str.1
28359 Bremen
Tel. : +49 421 22232-0
Fax : +49 421 22232-99

[email protected]
http://www.univention.de

Geschäftsführer: Peter H. Ganten
HRB 20755 Amtsgericht Bremen
Steuer-Nr.: 71-597-02876

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