Andreas Jellinghaus wrote:
> Am Mittwoch 28 Januar 2009 19:02:39 schrieb Stanislav Brabec:
> > In case of Smart Cards, it might be GID writability for "scard" group,
> > allowing to run smart card daemon without root privileges.
>
> if pcscd or openct should run as non-root, then there should be:
> * one way how openct/pcscd can access the serial and usb devices
> (please document what users with serial smart card readers need to do)
This might work:
<?xml version="1.0" encoding="ISO-8859-1"?>
<deviceinfo version="0.2">
<device>
<match key="linux.device_file" string="/dev/ttyS0">
<merge key="info.category" type="string">smart_card_reader</merge>
</match>
</device>
</deviceinfo>
(Depending on system configuration, removing of "modem" capability would
be useful.)
* one way how users allowed to access the readers can connect to openct/pcscd
Socket GID writeable for scard. By default, no users are in scard group.
Then use e. g.:
polkit-auth --constraint local /var/run/openct
or something similar
> I think these two things should be kept seperated, and "scard" is already
> used
> for the later case.
"scard" UID may be used for daemon access, "scard" GID may be used as a
static alternative for these sysadmins, that don't want to use
PolicyKit.
Static style (rough draft):
chown -R scard:scard /var/run/openct
chmod -R 770 /var/run/openct
chmod -R 770 /dev/path_to_the_reader
Run daemon as scard user.
Add selected users to groups scard.
=> Only users in group scard can access the reader.
Dynamic way with HAL+PolicyKit (rough draft):
- set PolicyKit according to http://bugs.freedesktop.org/show_bug.cgi?id=19663
chown -R scard:scard /var/run/openct
chmod -R 770 /var/run/openct
polkit-auth --constraint local /var/run/openct
(/dev/path_to_the_reader is handled by PolicyKit automatically)
Run daemon as scard user.
Don't add anybody to groups scard.
=> Only users logged localy can access the reader (it can be changed in
PolicyKit settings).
--
Best Regards / S pozdravem,
Stanislav Brabec
software developer
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