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scd: New option --pcsc-shared.

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* scd/scdaemon.h (opt): Add field opcsc_shared.
* scd/scdaemon.c (opcscShared): New.
(opts): Add "--pcsc-shared".
(main): Set flag.
* scd/apdu.c (connect_pcsc_card): Use it.
(pcsc_get_status): Take flag in account.
* scd/app-openpgp.c (cache_pin): Bypass in shared mode.
(verify_chv2: Do not auto verify chv1 in shared mode.
* scd/app-piv.c (cache_pin): By pass caceh in shared mode.
--

This option should in general not be used.  The patch tries to limit
bad effects but using shared mode is somewhat dangerous depending on
the other PC/SC users.
This commit is contained in:
Werner Koch 2021-03-12 09:21:57 +01:00
parent 95156ef9bf
commit 5732e7a8e9
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6 changed files with 23 additions and 4 deletions
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6
doc/scdaemon.texi
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@ -226,6 +226,12 @@ Append all logging output to @var{file}. This is very helpful in
seeing what the agent actually does. Use @file{socket://} to log to
socket.
@item --pcsc-shared
@opindex pcsc-shared
Use shared mode to access the card via PC/SC. This is a somewhat
dangerous option because Scdaemon assumes exclusivbe access to teh
card and for example caches certain information from the card. Use
this option only if you know what you are doing.
@item --pcsc-driver @var{library}
@opindex pcsc-driver