Public bug reported:
On Ubuntu 12.04 the pcscd daemon is launched on demand by libpcsclite. I
believe it relies on the setgid bit on /usr/sbin/pcscd for the process
to gain proper rights to create /var/run/pcscd/pcscd.pid and
/var/run/pcscd/pcscd.comm. Ubuntu guest account Apparmor profile
prevents setgid bit taking action which means that under guest account
it is not possible to use smartcards.
Running pcscd -f as guest user results in:
00000000 pcscdaemon.c:520:main() cannot create /var/run/pcscd/pcscd.pid:
Permission denied
00000559 winscard_msg_srv.c:121:InitializeSocket() Unable to bind common
socket: Permission denied
00000565 pcscdaemon.c:574:main() Error initializing pcscd.
00000581 pcscdaemon.c:658:clean_temp_files() Cannot remove
/var/run/pcscd/pcscd.comm: No such file or directory
00000592 pcscdaemon.c:663:clean_temp_files() Cannot remove
/var/run/pcscd/pcscd.pid: No such file or directory
00000604 pcscdaemon.c:658:clean_temp_files() Cannot remove
/var/run/pcscd/pcscd.comm: No such file or directory
00000614 pcscdaemon.c:663:clean_temp_files() Cannot remove
/var/run/pcscd/pcscd.pid: No such file or directory
As regular user it works as expected and card reader is recognized by
opensc-tool -l
This bug is closely related to #1329923 and actually most of the nature
of the problem is described there.
As a workaround I have reverted /etc/init.d/pcscd to pre 1.6.0 behaviour
by commenting out exit 0 as the file itself suggests by running: sed -i
-e 's/^exit 0$/#exit 0/' /etc/init.d/pcscd
This just means that the on-demand feature is disabled by launching
pcscd during boot and everything works as expected
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1329936
Title:
lightdm-guest-session prevents launching pcscd on-demand
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