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Better syncronization of several smartcard sessions.

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This commit is contained in:
Werner Koch 2009-03-24 11:40:57 +00:00
parent 9828f9be11
commit f07e762d68
5 changed files with 82 additions and 17 deletions
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2
NEWS
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@ -13,6 +13,8 @@ Noteworthy changes in version 2.0.12
* Changed order of the confirmation questions for root certificates
and stores negative answers in trustlist.txt.
* Better synchronization of several smartcard sessions.
Noteworthy changes in version 2.0.11 (2009-03-03)
-------------------------------------------------

11
scd/ChangeLog
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@ -1,3 +1,14 @@
2009-03-24 Werner Koch <wk@g10code.com>
* command.c (struct server_local_s): Add flag
APP_CTX_MARKED_FOR_RELEASE.
(do_reset): Set the flag.
(open_card): Act on this flag.
* app-common.h (struct app_ctx_s): Add flag NO_REUSE.
(application_notify_card_reset): Set the flag.
* app.c (select_application, release_application): Take care of
that flag.
2009-03-20 Werner Koch <wk@g10code.com>
* app-nks.c (keygripstr_from_pk_file): Fix for TCOS 3 cards.

20
scd/app-common.h
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@ -38,15 +38,19 @@
struct app_local_s; /* Defined by all app-*.c. */
struct app_ctx_s {
unsigned int ref_count; /* Number of connections currently using
this application context. If this is
not 0 the application has been
initialized and the function pointers
may be used. Note that for unsupported
operations the particular function
pointer is set to NULL */
/* Number of connections currently using this application context.
If this is not 0 the application has been initialized and the
function pointers may be used. Note that for unsupported
operations the particular function pointer is set to NULL */
unsigned int ref_count;
int slot; /* Used reader. */
/* Flag indicating that a reset has been done for that application
and that this context is merely lingering and just should not be
reused. */
int no_reuse;
/* Used reader slot. */
int slot;
/* If this is used by GnuPG 1.4 we need to know the assuan context
in case we need to divert the operation to an already running

26
scd/app.c
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@ -173,6 +173,10 @@ application_notify_card_reset (int slot)
/* FIXME: We are ignoring any error value here. */
lock_reader (slot);
/* Mark application as non-reusable. */
if (lock_table[slot].app)
lock_table[slot].app->no_reuse = 1;
/* Deallocate a saved application for that slot, so that we won't
try to reuse it. If there is no saved application, set a flag so
that we won't save the current state. */
@ -241,6 +245,16 @@ select_application (ctrl_t ctrl, int slot, const char *name, app_t *r_app)
return gpg_error (GPG_ERR_CONFLICT);
}
/* Don't use a non-reusable marked application. */
if (app && app->no_reuse)
{
unlock_reader (slot);
log_info ("lingering application `%s' in use by reader %d"
" - can't switch\n",
app->apptype? app->apptype:"?", slot);
return gpg_error (GPG_ERR_CONFLICT);
}
/* If we don't have an app, check whether we have a saved
application for that slot. This is useful so that a card does
not get reset even if only one session is using the card - this
@ -278,7 +292,7 @@ select_application (ctrl_t ctrl, int slot, const char *name, app_t *r_app)
unlock_reader (slot);
return 0; /* Okay: We share that one. */
}
/* Need to allocate a new one. */
app = xtrycalloc (1, sizeof *app);
if (!app)
@ -458,7 +472,15 @@ release_application (app_t app)
if (lock_table[slot].last_app)
deallocate_app (lock_table[slot].last_app);
lock_table[slot].last_app = lock_table[slot].app;
if (app->no_reuse)
{
/* If we shall not re-use the application we can't save it for
later use. */
deallocate_app (app);
lock_table[slot].last_app = NULL;
}
else
lock_table[slot].last_app = lock_table[slot].app;
lock_table[slot].app = NULL;
unlock_reader (slot);
}

40
scd/command.c
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@ -112,6 +112,10 @@ struct server_local_s
continue operation. */
int card_removed;
/* Flag indicating that the application context needs to be released
at the next opportunity. */
int app_ctx_marked_for_release;
/* A disconnect command has been sent. */
int disconnect_allowed;
@ -165,7 +169,7 @@ initialize_module_command (void)
/* Update the CARD_REMOVED element of all sessions using the reader
given by SLOT to VALUE */
given by SLOT to VALUE. */
static void
update_card_removed (int slot, int value)
{
@ -274,11 +278,24 @@ do_reset (ctrl_t ctrl, int send_reset)
if (!(slot == -1 || (slot >= 0 && slot < DIM(slot_table))))
BUG ();
/* If there is an active application, release it. */
/* If there is an active application, release it. Tell all other
sessions using the same application to release the
application. */
if (ctrl->app_ctx)
{
release_application (ctrl->app_ctx);
ctrl->app_ctx = NULL;
if (send_reset)
{
struct server_local_s *sl;
for (sl=session_list; sl; sl = sl->next_session)
if (sl->ctrl_backlink
&& sl->ctrl_backlink->reader_slot == slot)
{
sl->app_ctx_marked_for_release = 1;
}
}
}
/* If we want a real reset for the card, send the reset APDU and
@ -397,14 +414,23 @@ open_card (ctrl_t ctrl, const char *apptype)
if ( IS_LOCKED (ctrl) )
return gpg_error (GPG_ERR_LOCKED);
if (ctrl->app_ctx)
/* If the application has been marked for release do it now. We
can't do it immediately in do_reset because the application may
still be in use. */
if (ctrl->server_local->app_ctx_marked_for_release)
{
/* Already initialized for one specific application. Need to
check that the client didn't requested a specific application
different from the one in use. */
return check_application_conflict (ctrl, apptype);
ctrl->server_local->app_ctx_marked_for_release = 0;
release_application (ctrl->app_ctx);
ctrl->app_ctx = NULL;
}
/* If we are already initialized for one specific application we
need to check that the client didn't requested a specific
application different from the one in use before we continue. */
if (ctrl->app_ctx)
return check_application_conflict (ctrl, apptype);
/* Setup the slot and select the application. */
if (ctrl->reader_slot != -1)
slot = ctrl->reader_slot;
else