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scd: Implement auto-switching between Yubikey apps.
* scd/app.c (apptype_from_keyref): New. (maybe_switch_app): Add arg 'keyref' and use this also for switching. Change all callers to pass a keyref if needed. -- A drawback of this auto-switching is that the PIN cache of the cards are cleared. That could be mitigated by having our own cache but we always tried to avoid that. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
5d9eb060b7
commit
7febb4f247
139
scd/app.c
139
scd/app.c
@ -121,6 +121,31 @@ apptype_from_name (const char *name)
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}
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/* Return the apptype for KEYREF. This is the first part of the
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* KEYREF up to the dot. */
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static apptype_t
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apptype_from_keyref (const char *keyref)
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{
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int i;
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unsigned int n;
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const char *s;
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if (!keyref)
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return APPTYPE_NONE;
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s = strchr (keyref, '.');
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if (!s || s == keyref || !s[1])
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return APPTYPE_NONE; /* Not a valid keyref. */
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n = s - keyref;
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for (i=0; app_priority_list[i].apptype; i++)
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if (strlen (app_priority_list[i].name) == n
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&& !ascii_strncasecmp (app_priority_list[i].name, keyref, n))
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return app_priority_list[i].apptype;
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return APPTYPE_NONE;
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}
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/* Initialization function to change the default app_priority_list.
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* LIST is a list of comma or space separated strings with application
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* names. Unknown names will only result in warning message.
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@ -243,6 +268,7 @@ app_dump_state (void)
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{
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log_info ("app_dump_state: card=%p slot=%d type=%s\n",
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c, c->slot, strcardtype (c->cardtype));
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/* FIXME The use of log_info risks a race! */
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for (a=c->app; a; a = a->next)
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log_info ("app_dump_state: app=%p type='%s'\n",
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a, strapptype (a->apptype));
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@ -1070,10 +1096,12 @@ app_get_serialno (app_t app)
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* that the new active app will be moved to the head of the list at
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* CARD->app. Thus function must be called with the card lock held. */
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static gpg_error_t
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maybe_switch_app (ctrl_t ctrl, card_t card)
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maybe_switch_app (ctrl_t ctrl, card_t card, const char *keyref)
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{
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gpg_error_t err;
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app_t app, app_prev;
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app_t app;
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app_t app_prev = NULL;
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apptype_t apptype;
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if (!card->ref_count || !card->app)
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return gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
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@ -1084,39 +1112,82 @@ maybe_switch_app (ctrl_t ctrl, card_t card)
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ctrl->current_apptype = card->app->apptype;
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return 0;
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}
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log_debug ("card=%p want=%s card->app=%s\n",
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card, strapptype (ctrl->current_apptype),
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strapptype (card->app->apptype));
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app_dump_state ();
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if (ctrl->current_apptype == card->app->apptype)
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return 0; /* No need to switch. */
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app_prev = card->app;
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for (app = app_prev->next; app; app_prev = app, app = app->next)
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if (app->apptype == ctrl->current_apptype)
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break;
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if (DBG_APP)
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log_debug ("slot %d: have=%s want=%s keyref=%s\n",
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card->slot, strapptype (card->app->apptype),
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strapptype (ctrl->current_apptype),
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keyref? keyref:"[none]");
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app = NULL;
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if (keyref)
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{
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/* Switch based on the requested KEYREF. */
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apptype = apptype_from_keyref (keyref);
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if (apptype)
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{
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for (app = card->app; app; app_prev = app, app = app->next)
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if (app->apptype == apptype)
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break;
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if (!app_prev && ctrl->current_apptype == card->app->apptype)
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return 0; /* Already the first app - no need to switch. */
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}
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else if (strlen (keyref) == 40)
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{
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/* This looks like a keygrip. Iterate over all apps to find
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* the corresponding app. */
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for (app = card->app; app; app_prev = app, app = app->next)
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if (app->fnc.with_keygrip
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&& !app->fnc.with_keygrip (app, ctrl,
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KEYGRIP_ACTION_LOOKUP, keyref))
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break;
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if (!app_prev && ctrl->current_apptype == card->app->apptype)
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return 0; /* Already the first app - no need to switch. */
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}
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}
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if (!app)
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{
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/* Switch based on the current application of this connection or
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* if a keyref based switch didn't worked. */
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if (ctrl->current_apptype == card->app->apptype)
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return 0; /* No need to switch. */
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app_prev = card->app;
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for (app = app_prev->next; app; app_prev = app, app = app->next)
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if (app->apptype == ctrl->current_apptype)
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break;
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}
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if (!app)
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return gpg_error (GPG_ERR_WRONG_CARD);
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if (!app->fnc.reselect)
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{
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log_error ("oops: reselect function missing for '%s'\n",
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strapptype(app->apptype));
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strapptype (app->apptype));
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return gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
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}
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err = app->fnc.reselect (app, ctrl);
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if (err)
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{
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log_error ("error re-selecting '%s': %s\n",
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strapptype(app->apptype), gpg_strerror (err));
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log_error ("card %d: error re-selecting '%s': %s\n",
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card->slot, xstrapptype (app), gpg_strerror (err));
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return err;
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}
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/* Swap APP with the head of the app list. Note that APP is not the
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* head of the list. */
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app_prev->next = app->next;
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app->next = card->app;
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card->app = app;
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/* Swap APP with the head of the app list if needed. Note that APP
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* is not the head of the list. */
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if (app_prev)
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{
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app_prev->next = app->next;
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app->next = card->app;
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card->app = app;
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}
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if (opt.verbose)
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log_info ("card %d: %s '%s'\n",
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card->slot, app_prev? "switched to":"re-selected",
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xstrapptype (app));
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ctrl->current_apptype = app->apptype;
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log_info ("switched to '%s'\n", strapptype (app->apptype));
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return 0;
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}
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@ -1162,7 +1233,7 @@ app_write_learn_status (card_t card, ctrl_t ctrl, unsigned int flags)
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/* Always make sure that the current app for this connection has
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* been selected and is at the top of the list. */
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, NULL)))
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;
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else if (!card->app->fnc.learn_status)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1220,7 +1291,7 @@ app_readcert (card_t card, ctrl_t ctrl, const char *certid,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, certid)))
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;
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else if (!card->app->fnc.readcert)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1262,7 +1333,7 @@ app_readkey (card_t card, ctrl_t ctrl, const char *keyid, unsigned int flags,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keyid)))
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;
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else if (!card->app->fnc.readkey)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1291,7 +1362,7 @@ app_getattr (card_t card, ctrl_t ctrl, const char *name)
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, NULL)))
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;
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else if (name && !strcmp (name, "CARDTYPE"))
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{
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@ -1344,7 +1415,7 @@ app_setattr (card_t card, ctrl_t ctrl, const char *name,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, NULL)))
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;
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else if (!card->app->fnc.setattr)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1380,7 +1451,7 @@ app_sign (card_t card, ctrl_t ctrl, const char *keyidstr, int hashalgo,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keyidstr)))
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;
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else if (!card->app->fnc.sign)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1421,7 +1492,7 @@ app_auth (card_t card, ctrl_t ctrl, const char *keyidstr,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keyidstr)))
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;
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else if (!card->app->fnc.auth)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1464,7 +1535,7 @@ app_decipher (card_t card, ctrl_t ctrl, const char *keyidstr,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keyidstr)))
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;
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else if (!card->app->fnc.decipher)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1503,7 +1574,7 @@ app_writecert (card_t card, ctrl_t ctrl,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, certidstr)))
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;
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else if (!card->app->fnc.writecert)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1539,7 +1610,7 @@ app_writekey (card_t card, ctrl_t ctrl,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keyidstr)))
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;
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else if (!card->app->fnc.writekey)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1574,7 +1645,7 @@ app_genkey (card_t card, ctrl_t ctrl, const char *keynostr,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, keynostr)))
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;
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else if (!card->app->fnc.genkey)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1634,7 +1705,7 @@ app_change_pin (card_t card, ctrl_t ctrl, const char *chvnostr,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, NULL)))
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;
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else if (!card->app->fnc.change_pin)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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@ -1670,7 +1741,7 @@ app_check_pin (card_t card, ctrl_t ctrl, const char *keyidstr,
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if (err)
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return err;
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if ((err = maybe_switch_app (ctrl, card)))
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if ((err = maybe_switch_app (ctrl, card, NULL)))
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;
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else if (!card->app->fnc.check_pin)
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err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
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