Re: scdaemon does not "see" card insertion

[Matthias Apitz]

El día miércoles, julio 05, 2017 a las 09:23:06a. m. +0900, NIIBE Yutaka 
escribió:

> Hello,
> 
> Matthias Apitz  wrote:
> > The script 'scd-event' is only invoked on card removal (I do just en
> > echo of the args):
> [...]
> > A card insert is only seen *after* some agent requires something, for
> > example the SSH client needs access to the secret key on the card;
> 
> Right.  Scdaemon only watches the event of card removal and card reader
> removal.
> 
> ...

Hello,

Thanks for all explanations. For now I implemented the scd-event script
as:

...

DISPLAY=:0 export DISPLAY
if [ x$status = xNOCARD ]; then
nohup /usr/local/lib/kde4/libexec/kscreenlocker_greet --immediateLock &
while true; do
  # Signature key : 5E69 FBAC ...
  gpg2 --card-status | grep '5E69 FBAC' >> /tmp/scd-event.log  && {
  killall kscreenlocker_greet
  break
  }
  sleep 1  
done
fi

which works nice: on card removal it locks the screen and on card insert
it unlocks it fine.

> > On the UNIX system level the card insert triggers via devd(8) the start
> > of /usr/local/sbin/pcscd and the card removal triggers a 'killall pcscd'.
> > This is working fine, i.e. an inserted card is useable immediately, 
> > requesting 
> > the PIN entry.
> 
> IIUC, system level service like devd can only handle the event of card
> reader insertion, not card insertion.  I may be wrong here.

No, you are correct, I was inprecise.

matthias
-- 
Matthias Apitz, ✉ g...@unixarea.de, ⌂ http://www.unixarea.de/  ☎ 
+49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub
8. Mai 1945: Wer nicht feiert hat den Krieg verloren.
8 de mayo de 1945: Quien no festeja perdió la Guerra.
May 8, 1945: Who does not celebrate lost the War.


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Re: scdaemon does not "see" card insertion

[NIIBE Yutaka]

Hello,

Matthias Apitz  wrote:
> The script 'scd-event' is only invoked on card removal (I do just en
> echo of the args):
[...]
> A card insert is only seen *after* some agent requires something, for
> example the SSH client needs access to the secret key on the card;

Right.  Scdaemon only watches the event of card removal and card reader
removal.

In the past, once, scdaemon implementation in 2.0 partially tried to
support watching insertion, too.  The name "scdaemon" would have implied
that, perhaps.  We couldn't go this road well, because a card reader is
shared resource and there are valid use cases for other cards.

Then, the development of scdaemon evolved as openpgp-card-helper for
GnuPG.

This focus could stabilize the use case for GnuPG, and it resulted
less conflict for other use cases for card and card reader.

> On the UNIX system level the card insert triggers via devd(8) the start
> of /usr/local/sbin/pcscd and the card removal triggers a 'killall pcscd'.
> This is working fine, i.e. an inserted card is useable immediately, 
> requesting 
> the PIN entry.

IIUC, system level service like devd can only handle the event of card
reader insertion, not card insertion.  I may be wrong here.

I think that it is good for your use case to use PC/SC daemon
and its related tool.

I found a tool named card_eventmgr in:

https://github.com/OpenSC/pam_pkcs11/tree/master/src/tools/

This may help.  (No, I don't have any experience with this tool.)
-- 

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