Ludovic Rousseau's blog

Wednesday, June 26, 2019

GnuPG and PC/SC conflicts

GnuPG

" GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP). GnuPG allows you to encrypt and sign your data and communications. "

GnuPG provides support of smart card using the OpenPGP application in the card or token. See "How to use the Fellowship Smartcard" for more details.

PC/SC

PC/SC (defined by the PC/SC workgroup) is the "standard" way to access smart cards and smart card readers.

pcsc-lite is a Free Software implementation of the PC/SC standard often used in Unix systems.
pcscd is a daemon, part of pcsc-lite, accessing the smart card readers.

The problem

By default GnuPG has its own way to access smart cards with the help of the scdaemon helper process.

If you use GnuPG and also PC/SC on the same system you may have problems.

scdaemon get access

If scdaemon is started before pcscd then the smart card reader will not be available at the PC/SC level.
In pcscd logs you get the error:

ccid_usb.c:653:OpenUSBByName() Can't claim interface 1/12: LIBUSB_ERROR_BUSY

pcscd get access

If pcscd is started before scdaemon then the smart card will not be available at the GnuPG level.
You get the error:

$ gpg --card-status 
gpg: selecting openpgp failed: No such device
gpg: OpenPGP card not available: No such device

It is becoming a FAQ (Debian bug #925312, github issue) so I decided to document possible solutions.

The solutions

Remove pcscd from your system

The obvious solution to avoid the conflict is to remove one of the two participants.
If you use your smart card only with GnuPG then you can remove pcscd entirely.

But if you have pcscd installed it may be for a good reason. You may want/need to use PC/SC for other applications.

Tell GnuPG to use PC/SC

Another solution is to make GnuPG and pcscd collaborate to work together.
Luckily it is possible to do that using the scdaemon option --disable-ccid

From the documentation:
--disable-ccid

Disable the integrated support for CCID compliant readers. This allows falling back to one of the other drivers even if the internal CCID driver can handle the reader. Note, that CCID support is only available if libusb was available at build time.

With this option scdaemon will use PC/SC to talk to the smart card and the conflict is solved.

It is possible to tell scdaemon to always use this option by editing the scdaemon configuration file. By default it is ~/.gnupg/scdaemon.conf and it should contain the line:

disable-ccid

If you try to make it work be sure to kill any running scdaemon process so that it is restarted with the new option.

Conclusion

I don't know if the problem comes from pcscd or from GnuPG.

The good news is that there is a solution.

Saturday, June 15, 2019

https://www.pcscworkgroup.com/ is back

After few days the PC/SC work group web site is available again.
https://www.pcscworkgroup.com/

One week ago in "http://www.pcscworkgroup.com is gone" I announced that the website was dead. It has now resurrected.

PC/SC specifications copies

I will keep my PC/SC specifications copies at https://muscle.apdu.fr/www.pcscworkgroup.com/ just in case the official web site disappears again.

WHQL test cards

It is now also possible to order the "PC/SC Test Card Set V2.0" from https://www.pcscworkgroup.com/product/pcsc-test-card-set-v2-0/.
The price is $1000 for 5 cards.

I am not sure I will buy some sets just to speculate on the death again of the PC/SC website. 😏

Monday, June 10, 2019

PC/SC workgroup and WHQL test cards

PC/SC work group

The PC/SC work group was not only used for updating and distributing the PC/SC specification. It was also the reseller of a set of smart cards used by the WHQL process.

WHQL

WHQL is Windows Hardware Quality Labs. I am not a Windows user (and even less an expert) so I may be wrong here.

It looks like that smart card reader drivers need to go through the WHQL process to be signed by Microsoft and accepted by Windows systems.
The WHQL process for smart card reader driver required the use of a specific set of cards. This set of cards was sold by the PC/SC work group.

Test cards set

Since the PC/SC work group is now dead (see "http://www.pcscworkgroup.com is gone") it is no more possible to buy such cards set.

The Internet archive service do not have a copy of the "Test Cards" or "Test Cards Ordering" pages. I never used such test cards for my own use. I don't know what the procedure was to order such a Test Cards set.

Solution

I can't help here.
The best I can think of is to contact Microsoft so they provide the Test Cards set themselves or change the WHQL process to use something else.

Maybe some company that have one (or more) complete Test Cards set can rent the set for a good amount of money. If the set is rare it should be expensive (supply and demand). Why don't I have such set myself? 😀

Friday, June 7, 2019

http://www.pcscworkgroup.com is gone

Since a few days/weeks the web site http://www.pcscworkgroup.com is no more available (HTTP Error 404).
This web site hosted the PC/SC specification. This specification is implemented as WinSCard API for Windows and pcsc-lite on Unix.

PC/SC is the standard way to access smart card readers and smart cards from a Windows of Unix system.
See "PC/SC sample in different languages" for some examples.

Last days

The death of the web site was not announced on any PC/SC mailing list I know.

The latest meeting of the PC/SC members was in December 2016.
The latest email I received from the pcscmembers mailing list was in January 2018.

I guess the group went out of money (not enough paying members) and the company managing the website and meetings (at a very high price) just stopped providing services.

The PC/SC specification are mature enough, or PC/SC members just moved to something else?
It is important to note that Windows never implemented the latest version of PC/SC v2 part 10 (to support pinpad readers in the Windows CCID driver for example). So working on a specification that is not implemented by the major provider is somewhat useless.

Web site copies

The web site was still available the 9th of January 2019 and it has been archived by the Internet Archive (Wayback Machine) at https://web.archive.org/web/20190109211601/https://www.pcscworkgroup.com/

The specification files are also available from the Internet Archive at https://web.archive.org/web/20170904222045/https://www.pcscworkgroup.com/specifications/download/

PC/SC specifications copies

I decided to host a copy of the PC/SC specification documents on https://muscle.apdu.fr/www.pcscworkgroup.com/.
I used the copies I made for my own use. But now that the official web site is down I make them public.

Conclusion

It is sad to see a website to disappear silently with no warnings.
If you have other PC/SC public documents you want to share just tell me.

Thursday, May 30, 2019

Surprising request from a law firm

A few weeks ago I received this email:

From: legal@axur.com
To: Ludovic.Rousseau@gmail.com
Subject: [high priority] [19444663] Content Removal - SENSITIVE DATA

Dear Sir/Madam,

Our company, AXUR, represents C.......R in issues involving the violation of intellectual property and fraud on the Internet.

C.......R is the only company authorized to use the trademark and owns or licenses numerous trademark registrations worldwide, including, but not limited to the following registration number 825503736.

The trademarks, logos, words and phrases registered by C.......R shall be exclusively used by C.......R and any other use by a third party constitutes a trademark infringement.

It has come to our attention that the reported content provides related content (see attached) to the trademark without having obtained prior written authorization from C.......R . More specifically, this content disclosures SENSITIVE DATA from our client or its customer, creating a Likelihood of Confusion between the trademark and the reported content.

Furthermore, by misusing the trademark on your website, you are also diluting its use, because it weakens the ability of brand identification as a single source of research and may lead consumers to believe that there is some association between C.......R and your website.

Official Website: https://www.c.......rsolucoes.com.br/

Considering the violation of intellectual property rights of C.......R on your website, we kindly request that you remove all content available on the attached URL(s) which use the above mentioned trademark without having obtained prior authorization.

In order to avoid a lawsuit from a federal court, please, send confirmation that this email was received along with your guarantee to comply with the requests reported above.

Under penalty of perjury, we affirm that AXUR is authorized to act on behalf of the C.......R and this notification is in accordance with International Regulations of Internet and Intellectual Property Offices.

Should you require further information or should you prefer to discuss this issue, please do not hesitate to contact us through the e-mail address listed on the signature of this message.

Sincerely,

AXUR
Legal Team
legal@axur.com

ATTACHMENT:
https://raw.githubusercontent.com/LudovicRousseau/pcsc-tools/master/smartcard_list.txt

I replaced the real trademark by "C.......R" to avoid receiving a new email asking to remove this blog article :-)

I also received the same email but with a different subject "[high priority] [19444667] Content Removal" for the same list but with a different URL: https://github.com/LudovicRousseau/pcsc-tools/blob/master/smartcard_list.txt

Actions

I updated the list of ATR to remove any mention of "C.......R".

I asked confirmation from legal@axur.com that the ATR list was OK now. I got no answer.

I also wrote them I would blog about it and got no answer as well.

Wednesday, May 22, 2019

pam_pkcs11: new version 0.6.11

About

From the project wiki page:

This Linux-PAM login module allows a X.509 certificate based user login. The certificate and its dedicated private key are thereby accessed by means of an appropriate PKCS #11 module. For the verification of the users’ certificates, locally stored CA certificates as well as either online or locally accessible CRLs are used.

The idea is to use a smart card and its corresponding PKCS#11 library to login (and more) into a GNU/Linux system.

Changes:

22 May 2019

Version 0.6.11
Support OpenSSL 1.1.0
use green instead of blue text for logs on the console
Solaris runs build process outside of srcdir
Fix openssh_mapper_match_keys() for OpenSSL 1.0 & 1.1
Fix 64-bit pkcs11_inspect(1) fails on SPARC with a SIBGUS due to misaligned access
Add support of ECDSA signature in addition to RSA

Download

Download the .tar.gz archive from https://sourceforge.net/projects/opensc/files/pam_pkcs11/

The .tar.gz or .zip files available from github are not complete (the ./configure script is missing for example)

History

In a previous blog article "pam_pkcs11: new/last version 0.6.9" (3 years ago) I wrote that it was my last release of pam_pkcs11.

But I had to work on a problem related to the use of pam_pkcs11.
I discovered that the version 0.6.10 (released by Paul Wolneykien, thanks) was not available in Debian.
I decided to upgrade the Debian package.
But version 0.6.10 broke support of OpenSSL 1.1.0 and the build for Debian failed.
So I had to fix that and decided to also merge submitted patches and fix other reported bugs.

That is why you now have a new version of pam_pkcs11.