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scd: Detect external interference when PCSC_SHARED.

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* scd/app-common.h (check_aid): New method.
* scd/app-openpgp.c (do_check_aid): New.
* scd/app-piv.c (do_check_aid): New.
* scd/app.c (check_external_interference): New.
(maybe_switch_app): Check interference to determine switching is
needed.

--

GnuPG-bug-id: 5484
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-07-06 14:52:29 +09:00
parent 5f78ae696c
commit 044e5a3c38
4 changed files with 72 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

13
scd/app-openpgp.c
View file

@ -6134,6 +6134,18 @@ do_reselect (app_t app, ctrl_t ctrl)
}
/* Check if AID is the correct one. */
static gpg_error_t
do_check_aid (app_t app, ctrl_t ctrl, const unsigned char *aid, size_t aidlen)
{
if (aidlen >= sizeof openpgp_aid
&& memcmp (aid, openpgp_aid, sizeof openpgp_aid) == 0)
return 0;
return gpg_error (GPG_ERR_WRONG_CARD);
}
/* Select the OpenPGP application on the card in SLOT. This function
must be used before any other OpenPGP application functions. */
gpg_error_t
@ -6322,6 +6334,7 @@ app_select_openpgp (app_t app)
app->fnc.change_pin = do_change_pin;
app->fnc.check_pin = do_check_pin;
app->fnc.with_keygrip = do_with_keygrip;
app->fnc.check_aid = do_check_aid;
}
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