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0400a4eb17
gnupg/scd/app.c
Werner Koch 0400a4eb17
scd: Take the lock earlier in the function dispatchers. 
* scd/app.c: Chnage all function dispatcher.
--

This change will allow us to easier integrate an app swithcing logic.
The change should have no user visible effect.  The error checking we
do now with the card locked will rarely be asserted.  It is the
correct thing to do anyway.

Signed-off-by: Werner Koch <wk@gnupg.org>
2019-06-21 14:01:06 +02:00

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/* app.c - Application selection.
* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <npth.h>
#include "scdaemon.h"
#include "../common/exechelp.h"
#include "iso7816.h"
#include "apdu.h"
#include "../common/tlv.h"
/* Lock to protect the list of cards and its associated
* applications. */
static npth_mutex_t card_list_lock;
/* A list of card contexts. A card is a collection of applications
* (described by app_t) on the same physical token. */
static card_t card_top;
/* The list of application names and their select function. If no
* specific application is selected the first available application on
* a card is selected. */
struct app_priority_list_s
{
apptype_t apptype;
char const *name;
gpg_error_t (*select_func)(app_t);
};
static struct app_priority_list_s app_priority_list[] =
{{ APPTYPE_OPENPGP , "openpgp", app_select_openpgp },
{ APPTYPE_PIV , "piv", app_select_piv },
{ APPTYPE_NKS , "nks", app_select_nks },
{ APPTYPE_P15 , "p15", app_select_p15 },
{ APPTYPE_GELDKARTE, "geldkarte", app_select_geldkarte },
{ APPTYPE_DINSIG , "dinsig", app_select_dinsig },
{ APPTYPE_SC_HSM , "sc-hsm", app_select_sc_hsm },
{ APPTYPE_NONE , NULL, NULL }
/* APPTYPE_UNDEFINED is special and not listed here. */
};
/* Map a cardtype to a string. Never returns NULL. */
const char *
strcardtype (cardtype_t t)
{
switch (t)
{
case CARDTYPE_GENERIC: return "generic";
case CARDTYPE_YUBIKEY: return "yubikey";
}
return "?";
}
/* Map an application type to a string. Never returns NULL. */
const char *
strapptype (apptype_t t)
{
int i;
for (i=0; app_priority_list[i].apptype; i++)
if (app_priority_list[i].apptype == t)
return app_priority_list[i].name;
return t == APPTYPE_UNDEFINED? "undefined" : t? "?" : "none";
}
/* Initialization function to change the default app_priority_list.
* LIST is a list of comma or space separated strings with application
* names. Unknown names will only result in warning message.
* Application not mentioned in LIST are used in their original order
* after the given once. */
void
app_update_priority_list (const char *arg)
{
struct app_priority_list_s save;
char **names;
int i, j, idx;
names = strtokenize (arg, ", ");
if (!names)
log_fatal ("strtokenize failed: %s\n",
gpg_strerror (gpg_error_from_syserror ()));
idx = 0;
for (i=0; names[i]; i++)
{
ascii_strlwr (names[i]);
for (j=0; j < i; j++)
if (!strcmp (names[j], names[i]))
break;
if (j < i)
{
log_info ("warning: duplicate application '%s' in priority list\n",
names[i]);
continue;
}
for (j=idx; app_priority_list[j].name; j++)
if (!strcmp (names[i], app_priority_list[j].name))
break;
if (!app_priority_list[j].name)
{
log_info ("warning: unknown application '%s' in priority list\n",
names[i]);
continue;
}
save = app_priority_list[idx];
app_priority_list[idx] = app_priority_list[j];
app_priority_list[j] = save;
idx++;
}
log_assert (idx < DIM (app_priority_list));
xfree (names);
for (i=0; app_priority_list[i].name; i++)
log_info ("app priority %d: %s\n", i, app_priority_list[i].name);
}
static void
print_progress_line (void *opaque, const char *what, int pc, int cur, int tot)
{
ctrl_t ctrl = opaque;
char line[100];
if (ctrl)
{
snprintf (line, sizeof line, "%s %c %d %d", what, pc, cur, tot);
send_status_direct (ctrl, "PROGRESS", line);
}
}
/* Lock the CARD. This function shall be used right before calling
* any of the actual application functions to serialize access to the
* reader. We do this always even if the card is not actually used.
* This allows an actual connection to assume that it never shares a
* card (while performing one command). Returns 0 on success; only
* then the unlock_reader function must be called after returning from
* the handler. Right now we assume a that a reader has just one
* card; this may eventually need refinement. */
static gpg_error_t
lock_card (card_t card, ctrl_t ctrl)
{
if (npth_mutex_lock (&card->lock))
{
gpg_error_t err = gpg_error_from_syserror ();
log_error ("failed to acquire CARD lock for %p: %s\n",
card, gpg_strerror (err));
return err;
}
apdu_set_progress_cb (card->slot, print_progress_line, ctrl);
apdu_set_prompt_cb (card->slot, popup_prompt, ctrl);
return 0;
}
/* Release a lock on a card. See lock_reader(). */
static void
unlock_card (card_t card)
{
apdu_set_progress_cb (card->slot, NULL, NULL);
apdu_set_prompt_cb (card->slot, NULL, NULL);
if (npth_mutex_unlock (&card->lock))
{
gpg_error_t err = gpg_error_from_syserror ();
log_error ("failed to release CARD lock for %p: %s\n",
card, gpg_strerror (err));
}
}
/* This function may be called to print information pertaining to the
* current state of this module to the log. */
void
app_dump_state (void)
{
card_t c;
app_t a;
npth_mutex_lock (&card_list_lock);
for (c = card_top; c; c = c->next)
{
log_info ("app_dump_state: card=%p slot=%d type=%s\n",
c, c->slot, strcardtype (c->cardtype));
for (a=c->app; a; a = a->next)
log_info ("app_dump_state: app=%p type='%s'\n",
a, strapptype (a->apptype));
}
npth_mutex_unlock (&card_list_lock);
}
/* Check whether the application NAME is allowed. This does not mean
we have support for it though. */
static int
is_app_allowed (const char *name)
{
strlist_t l;
for (l=opt.disabled_applications; l; l = l->next)
if (!strcmp (l->d, name))
return 0; /* no */
return 1; /* yes */
}
/* This function is mainly used by the serialno command to check for
* an application conflict which may appear if the serialno command is
* used to request a specific application and the connection has
* already done a select_application. Return values are:
* 0 - No conflict
* GPG_ERR_FALSE - Another application is in use but it is possible
* to switch to the requested application.
* other code - Switching is not possible.
*/
gpg_error_t
check_application_conflict (card_t card, const char *name)
{
if (!card || !name)
return 0;
if (!card->app)
return gpg_error (GPG_ERR_CARD_NOT_INITIALIZED); /* Should not happen. */
if (!card->app->apptype
|| !ascii_strcasecmp (strapptype (card->app->apptype), name))
return 0;
if (card->app->apptype == APPTYPE_UNDEFINED)
return 0;
if (card->cardtype == CARDTYPE_YUBIKEY)
{
if (card->app->apptype == APPTYPE_OPENPGP)
{
/* Current app is OpenPGP. */
if (!ascii_strcasecmp (name, "piv"))
return gpg_error (GPG_ERR_FALSE); /* Switching allowed. */
}
else if (card->app->apptype == APPTYPE_PIV)
{
/* Current app is PIV. */
if (!ascii_strcasecmp (name, "openpgp"))
return gpg_error (GPG_ERR_FALSE); /* Switching allowed. */
}
}
log_info ("application '%s' in use - can't switch\n",
strapptype (card->app->apptype));
return gpg_error (GPG_ERR_CONFLICT);
}
gpg_error_t
card_reset (card_t card, ctrl_t ctrl, int send_reset)
{
gpg_error_t err = 0;
if (send_reset)
{
int sw;
lock_card (card, ctrl);
sw = apdu_reset (card->slot);
if (sw)
err = gpg_error (GPG_ERR_CARD_RESET);
card->reset_requested = 1;
unlock_card (card);
scd_kick_the_loop ();
gnupg_sleep (1);
}
else
{
ctrl->card_ctx = NULL;
card_unref (card);
}
return err;
}
static gpg_error_t
app_new_register (int slot, ctrl_t ctrl, const char *name,
int periodical_check_needed)
{
gpg_error_t err = 0;
card_t card = NULL;
app_t app = NULL;
unsigned char *result = NULL;
size_t resultlen;
int want_undefined;
int i;
/* Need to allocate a new card object */
card = xtrycalloc (1, sizeof *card);
if (!card)
{
err = gpg_error_from_syserror ();
log_info ("error allocating context: %s\n", gpg_strerror (err));
return err;
}
card->slot = slot;
card->card_status = (unsigned int)-1;
if (npth_mutex_init (&card->lock, NULL))
{
err = gpg_error_from_syserror ();
log_error ("error initializing mutex: %s\n", gpg_strerror (err));
xfree (card);
return err;
}
err = lock_card (card, ctrl);
if (err)
{
xfree (card);
return err;
}
want_undefined = (name && !strcmp (name, "undefined"));
/* Try to read the GDO file first to get a default serial number.
We skip this if the undefined application has been requested. */
if (!want_undefined)
{
err = iso7816_select_file (slot, 0x3F00, 1);
if (gpg_err_code (err) == GPG_ERR_CARD)
{
/* Might be SW==0x7D00. Let's test whether it is a Yubikey
* by selecting its manager application and then reading the
* config. */
static char const yk_aid[] =
{ 0xA0, 0x00, 0x00, 0x05, 0x27, 0x47, 0x11, 0x17 }; /*MGR*/
static char const otp_aid[] =
{ 0xA0, 0x00, 0x00, 0x05, 0x27, 0x20, 0x01 }; /*OTP*/
unsigned char *buf;
size_t buflen;
const unsigned char *s0;
unsigned char formfactor;
size_t n;
if (!iso7816_select_application (slot, yk_aid, sizeof yk_aid,
0x0001)
&& !iso7816_apdu_direct (slot, "\x00\x1d\x00\x00\x00", 5, 0,
NULL, &buf, &buflen))
{
card->cardtype = CARDTYPE_YUBIKEY;
if (opt.verbose)
{
log_info ("Yubico: config=");
log_printhex (buf, buflen, "");
}
/* We skip the first byte which seems to be the total
* length of the config data. */
if (buflen > 1)
{
s0 = find_tlv (buf+1, buflen-1, 0x04, &n); /* Form factor */
formfactor = (s0 && n == 1)? *s0 : 0;
s0 = find_tlv (buf+1, buflen-1, 0x02, &n); /* Serial */
if (s0 && n >= 4)
{
card->serialno = xtrymalloc (3 + 1 + n);
if (card->serialno)
{
card->serialnolen = 3 + 1 + n;
card->serialno[0] = 0xff;
card->serialno[1] = 0x02;
card->serialno[2] = 0x0;
card->serialno[3] = formfactor;
memcpy (card->serialno + 4, s0, n);
/* Note that we do not clear the error
* so that no further serial number
* testing is done. After all we just
* set the serial number. */
}
}
s0 = find_tlv (buf+1, buflen-1, 0x05, &n); /* version */
if (s0 && n == 3)
card->cardversion = ((s0[0]<<16)|(s0[1]<<8)|s0[2]);
else if (!s0)
{
/* No version - this is not a Yubikey 5. We now
* switch to the OTP app and take the first
* three bytes of the reponse as version
* number. */
xfree (buf);
buf = NULL;
if (!iso7816_select_application_ext (slot,
otp_aid, sizeof otp_aid,
1, &buf, &buflen)
&& buflen > 3)
card->cardversion = ((buf[0]<<16)|(buf[1]<<8)|buf[2]);
}
}
xfree (buf);
}
}
if (!err)
err = iso7816_select_file (slot, 0x2F02, 0);
if (!err)
err = iso7816_read_binary (slot, 0, 0, &result, &resultlen);
if (!err)
{
size_t n;
const unsigned char *p;
p = find_tlv_unchecked (result, resultlen, 0x5A, &n);
if (p)
resultlen -= (p-result);
if (p && n > resultlen && n == 0x0d && resultlen+1 == n)
{
/* The object does not fit into the buffer. This is an
invalid encoding (or the buffer is too short. However, I
have some test cards with such an invalid encoding and
therefore I use this ugly workaround to return something
I can further experiment with. */
log_info ("enabling BMI testcard workaround\n");
n--;
}
if (p && n <= resultlen)
{
/* The GDO file is pretty short, thus we simply reuse it for
storing the serial number. */
memmove (result, p, n);
card->serialno = result;
card->serialnolen = n;
err = app_munge_serialno (card);
if (err)
goto leave;
}
else
xfree (result);
result = NULL;
}
}
/* Allocate a new app object. */
app = xtrycalloc (1, sizeof *app);
if (!app)
{
err = gpg_error_from_syserror ();
log_info ("error allocating app context: %s\n", gpg_strerror (err));
goto leave;
}
card->app = app;
app->card = card;
/* Figure out the application to use. */
if (want_undefined)
{
/* We switch to the "undefined" application only if explicitly
requested. */
app->apptype = APPTYPE_UNDEFINED;
/* Clear the error so that we don't run through the application
* selection chain. */
err = 0;
}
else
{
/* For certain error codes, there is no need to try more. */
if (gpg_err_code (err) == GPG_ERR_CARD_NOT_PRESENT
|| gpg_err_code (err) == GPG_ERR_ENODEV)
goto leave;
/* Set a default error so that we run through the application
* selection chain. */
err = gpg_error (GPG_ERR_NOT_FOUND);
}
/* Find the first available app if NAME is NULL or the matching
* NAME but only if that application is also enabled. */
for (i=0; err && app_priority_list[i].name; i++)
{
if (is_app_allowed (app_priority_list[i].name)
&& (!name || !strcmp (name, app_priority_list[i].name)))
err = app_priority_list[i].select_func (app);
}
if (err && name && gpg_err_code (err) != GPG_ERR_OBJ_TERM_STATE)
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
leave:
if (err)
{
if (name)
log_info ("can't select application '%s': %s\n",
name, gpg_strerror (err));
else
log_info ("no supported card application found: %s\n",
gpg_strerror (err));
unlock_card (card);
xfree (app);
xfree (card);
return err;
}
card->periodical_check_needed = periodical_check_needed;
card->next = card_top;
card_top = card;
/* If no current apptype is known for this session, set it now. */
if (!ctrl->current_apptype)
ctrl->current_apptype = app->apptype;
unlock_card (card);
return 0;
}
/* If called with NAME as NULL, select the best fitting application
* and return its card context; otherwise select the application with
* NAME and return its card context. Returns an error code and stores
* NULL at R_CARD if no application was found or no card is present. */
gpg_error_t
select_application (ctrl_t ctrl, const char *name, card_t *r_card,
int scan, const unsigned char *serialno_bin,
size_t serialno_bin_len)
{
gpg_error_t err = 0;
card_t card, card_prev = NULL;
*r_card = NULL;
npth_mutex_lock (&card_list_lock);
if (scan || !card_top)
{
struct dev_list *l;
int new_card = 0;
/* Scan the devices to find new device(s). */
err = apdu_dev_list_start (opt.reader_port, &l);
if (err)
{
npth_mutex_unlock (&card_list_lock);
return err;
}
while (1)
{
int slot;
int periodical_check_needed_this;
slot = apdu_open_reader (l, !card_top);
if (slot < 0)
break;
periodical_check_needed_this = apdu_connect (slot);
if (periodical_check_needed_this < 0)
{
/* We close a reader with no card. */
err = gpg_error (GPG_ERR_ENODEV);
}
else
{
err = app_new_register (slot, ctrl, name,
periodical_check_needed_this);
new_card++;
}
if (err)
apdu_close_reader (slot);
}
apdu_dev_list_finish (l);
/* If new device(s), kick the scdaemon loop. */
if (new_card)
scd_kick_the_loop ();
}
for (card = card_top; card; card = card->next)
{
lock_card (card, ctrl);
if (serialno_bin == NULL)
break;
if (card->serialnolen == serialno_bin_len
&& !memcmp (card->serialno, serialno_bin, card->serialnolen))
break;
unlock_card (card);
card_prev = card;
}
if (card)
{
err = check_application_conflict (card, name);
if (!err)
{
/* Note: We do not use card_ref as we are already locked. */
card->ref_count++;
*r_card = card;
if (card_prev)
{
card_prev->next = card->next;
card->next = card_top;
card_top = card;
}
}
unlock_card (card);
}
else
err = gpg_error (GPG_ERR_ENODEV);
npth_mutex_unlock (&card_list_lock);
return err;
}
char *
get_supported_applications (void)
{
int idx;
size_t nbytes;
char *buffer, *p;
const char *s;
for (nbytes=1, idx=0; (s=app_priority_list[idx].name); idx++)
nbytes += strlen (s) + 1 + 1;
buffer = xtrymalloc (nbytes);
if (!buffer)
return NULL;
for (p=buffer, idx=0; (s=app_priority_list[idx].name); idx++)
if (is_app_allowed (s))
p = stpcpy (stpcpy (p, s), ":\n");
*p = 0;
return buffer;
}
/* Deallocate the application. */
static void
deallocate_card (card_t card)
{
card_t c, c_prev = NULL;
app_t a, anext;
for (c = card_top; c; c = c->next)
if (c == card)
{
if (c_prev == NULL)
card_top = c->next;
else
c_prev->next = c->next;
break;
}
else
c_prev = c;
if (card->ref_count)
log_error ("releasing still used card context (%d)\n", card->ref_count);
for (a = card->app; a; a = anext)
{
if (a->fnc.deinit)
{
a->fnc.deinit (a);
a->fnc.deinit = NULL;
}
anext = a->next;
xfree (a);
}
scd_clear_current_app (card);
xfree (card->serialno);
unlock_card (card);
xfree (card);
}
/* Increment the reference counter of CARD. Returns CARD. */
card_t
card_ref (card_t card)
{
lock_card (card, NULL);
++card->ref_count;
unlock_card (card);
return card;
}
/* Decrement the reference counter for CARD. Note that we are using
* reference counting to track the users of the card's application and
* are deferring the actual deallocation to allow for a later reuse by
* a new connection. Using NULL for CARD is a no-op. */
void
card_unref (card_t card)
{
if (!card)
return;
/* We don't deallocate CARD here. Instead, we keep it. This is
useful so that a card does not get reset even if only one session
is using the card - this way the PIN cache and other cached data
are preserved. */
lock_card (card, NULL);
card_unref_locked (card);
unlock_card (card);
}
/* This is the same as card_unref but assumes that CARD is already
* locked. */
void
card_unref_locked (card_t card)
{
if (!card)
return;
if (!card->ref_count)
log_bug ("tried to release an already released card context\n");
--card->ref_count;
}
/* The serial number may need some cosmetics. Do it here. This
function shall only be called once after a new serial number has
been put into APP->serialno.
Prefixes we use:
FF 00 00 = For serial numbers starting with an FF
FF 01 00 = Some german p15 cards return an empty serial number so the
serial number from the EF(TokenInfo) is used instead.
FF 02 00 = Serial number from Yubikey config
FF 7F 00 = No serialno.
All other serial number not starting with FF are used as they are.
*/
gpg_error_t
app_munge_serialno (card_t card)
{
if (card->serialnolen && card->serialno[0] == 0xff)
{
/* The serial number starts with our special prefix. This
requires that we put our default prefix "FF0000" in front. */
unsigned char *p = xtrymalloc (card->serialnolen + 3);
if (!p)
return gpg_error_from_syserror ();
memcpy (p, "\xff\0", 3);
memcpy (p+3, card->serialno, card->serialnolen);
card->serialnolen += 3;
xfree (card->serialno);
card->serialno = p;
}
else if (!card->serialnolen)
{
unsigned char *p = xtrymalloc (3);
if (!p)
return gpg_error_from_syserror ();
memcpy (p, "\xff\x7f", 3);
card->serialnolen = 3;
xfree (card->serialno);
card->serialno = p;
}
return 0;
}
/* Retrieve the serial number of the card. The serial number is
returned as a malloced string (hex encoded) in SERIAL. Caller must
free SERIAL unless the function returns an error. */
char *
card_get_serialno (card_t card)
{
char *serial;
if (!card)
return NULL;
if (!card->serialnolen)
serial = xtrystrdup ("FF7F00");
else
serial = bin2hex (card->serialno, card->serialnolen, NULL);
return serial;
}
/* Same as card_get_serialno but takes an APP object. */
char *
app_get_serialno (app_t app)
{
if (!app || !app->card)
return NULL;
return card_get_serialno (app->card);
}
/* Write out the application specific status lines for the LEARN
command. */
gpg_error_t
app_write_learn_status (card_t card, ctrl_t ctrl, unsigned int flags)
{
gpg_error_t err;
app_t app;
if (!card)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
app = card->app;
if (!app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!app->fnc.learn_status)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
{
/* We do not send CARD and APPTYPE if only keypairinfo is requested. */
if (!(flags &1))
{
if (card->cardtype)
send_status_direct (ctrl, "CARDTYPE", strcardtype (card->cardtype));
if (card->cardversion)
send_status_printf (ctrl, "CARDVERSION", "%X", card->cardversion);
if (app->apptype)
send_status_direct (ctrl, "APPTYPE", strapptype (app->apptype));
if (app->appversion)
send_status_printf (ctrl, "APPVERSION", "%X", app->appversion);
/* FIXME: Send info for the other active apps of the card? */
}
err = app->fnc.learn_status (app, ctrl, flags);
}
unlock_card (card);
return err;
}
/* Read the certificate with id CERTID (as returned by learn_status in
the CERTINFO status lines) and return it in the freshly allocated
buffer put into CERT and the length of the certificate put into
CERTLEN. */
gpg_error_t
app_readcert (card_t card, ctrl_t ctrl, const char *certid,
unsigned char **cert, size_t *certlen)
{
gpg_error_t err;
if (!card)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.readcert)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.readcert (card->app, certid, cert, certlen);
unlock_card (card);
return err;
}
/* Read the key with ID KEYID. On success a canonical encoded
* S-expression with the public key will get stored at PK and its
* length (for assertions) at PKLEN; the caller must release that
* buffer. On error NULL will be stored at PK and PKLEN and an error
* code returned. If the key is not required NULL may be passed for
* PK; this makse send if the APP_READKEY_FLAG_INFO has also been set.
*
* This function might not be supported by all applications. */
gpg_error_t
app_readkey (card_t card, ctrl_t ctrl, const char *keyid, unsigned int flags,
unsigned char **pk, size_t *pklen)
{
gpg_error_t err;
if (pk)
*pk = NULL;
if (pklen)
*pklen = 0;
if (!card || !keyid)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.readkey)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.readkey (card->app, ctrl, keyid, flags, pk, pklen);
unlock_card (card);
return err;
}
/* Perform a GETATTR operation. */
gpg_error_t
app_getattr (card_t card, ctrl_t ctrl, const char *name)
{
gpg_error_t err;
if (!card || !name || !*name)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (name && !strcmp (name, "CARDTYPE"))
{
send_status_direct (ctrl, "CARDTYPE", strcardtype (card->cardtype));
}
else if (name && !strcmp (name, "APPTYPE"))
{
send_status_direct (ctrl, "APPTYPE", strapptype (card->app->apptype));
}
else if (name && !strcmp (name, "SERIALNO"))
{
char *serial;
serial = card_get_serialno (card);
if (!serial)
err = gpg_error (GPG_ERR_INV_VALUE);
else
{
send_status_direct (ctrl, "SERIALNO", serial);
xfree (serial);
}
}
else if (!card->app->fnc.getattr)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.getattr (card->app, ctrl, name);
unlock_card (card);
return err;
}
/* Perform a SETATTR operation. */
gpg_error_t
app_setattr (card_t card, ctrl_t ctrl, const char *name,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const unsigned char *value, size_t valuelen)
{
gpg_error_t err;
if (!card || !name || !*name || !value)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.setattr)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.setattr (card->app, name, pincb, pincb_arg,
value, valuelen);
unlock_card (card);
return err;
}
/* Create the signature and return the allocated result in OUTDATA.
If a PIN is required the PINCB will be used to ask for the PIN; it
should return the PIN in an allocated buffer and put it into PIN. */
gpg_error_t
app_sign (card_t card, ctrl_t ctrl, const char *keyidstr, int hashalgo,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const void *indata, size_t indatalen,
unsigned char **outdata, size_t *outdatalen )
{
gpg_error_t err;
if (!card || !indata || !indatalen || !outdata || !outdatalen || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.sign)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.sign (card->app, keyidstr, hashalgo,
pincb, pincb_arg,
indata, indatalen,
outdata, outdatalen);
unlock_card (card);
if (opt.verbose)
log_info ("operation sign result: %s\n", gpg_strerror (err));
return err;
}
/* Create the signature using the INTERNAL AUTHENTICATE command and
return the allocated result in OUTDATA. If a PIN is required the
PINCB will be used to ask for the PIN; it should return the PIN in
an allocated buffer and put it into PIN. */
gpg_error_t
app_auth (card_t card, ctrl_t ctrl, const char *keyidstr,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const void *indata, size_t indatalen,
unsigned char **outdata, size_t *outdatalen )
{
gpg_error_t err;
if (!card || !indata || !indatalen || !outdata || !outdatalen || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.auth)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.auth (card->app, keyidstr,
pincb, pincb_arg,
indata, indatalen,
outdata, outdatalen);
unlock_card (card);
if (opt.verbose)
log_info ("operation auth result: %s\n", gpg_strerror (err));
return err;
}
/* Decrypt the data in INDATA and return the allocated result in OUTDATA.
If a PIN is required the PINCB will be used to ask for the PIN; it
should return the PIN in an allocated buffer and put it into PIN. */
gpg_error_t
app_decipher (card_t card, ctrl_t ctrl, const char *keyidstr,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const void *indata, size_t indatalen,
unsigned char **outdata, size_t *outdatalen,
unsigned int *r_info)
{
gpg_error_t err;
*r_info = 0;
if (!card || !indata || !indatalen || !outdata || !outdatalen || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.decipher)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.decipher (card->app, keyidstr,
pincb, pincb_arg,
indata, indatalen,
outdata, outdatalen,
r_info);
unlock_card (card);
if (opt.verbose)
log_info ("operation decipher result: %s\n", gpg_strerror (err));
return err;
}
/* Perform the WRITECERT operation. */
gpg_error_t
app_writecert (card_t card, ctrl_t ctrl,
const char *certidstr,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const unsigned char *data, size_t datalen)
{
gpg_error_t err;
if (!card || !certidstr || !*certidstr || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.writecert)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.writecert (card->app, ctrl, certidstr,
pincb, pincb_arg, data, datalen);
unlock_card (card);
if (opt.verbose)
log_info ("operation writecert result: %s\n", gpg_strerror (err));
return err;
}
/* Perform the WRITEKEY operation. */
gpg_error_t
app_writekey (card_t card, ctrl_t ctrl,
const char *keyidstr, unsigned int flags,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg,
const unsigned char *keydata, size_t keydatalen)
{
gpg_error_t err;
if (!card || !keyidstr || !*keyidstr || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.writekey)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.writekey (card->app, ctrl, keyidstr, flags,
pincb, pincb_arg, keydata, keydatalen);
unlock_card (card);
if (opt.verbose)
log_info ("operation writekey result: %s\n", gpg_strerror (err));
return err;
}
/* Perform a GENKEY operation. */
gpg_error_t
app_genkey (card_t card, ctrl_t ctrl, const char *keynostr,
const char *keytype, unsigned int flags, time_t createtime,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg)
{
gpg_error_t err;
if (!card || !keynostr || !*keynostr || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.genkey)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.genkey (card->app, ctrl, keynostr, keytype, flags,
createtime, pincb, pincb_arg);
unlock_card (card);
if (opt.verbose)
log_info ("operation genkey result: %s\n", gpg_strerror (err));
return err;
}
/* Perform a GET CHALLENGE operation. This function is special as it
directly accesses the card without any application specific
wrapper. */
gpg_error_t
app_get_challenge (card_t card, ctrl_t ctrl,
size_t nbytes, unsigned char *buffer)
{
gpg_error_t err;
if (!card || !nbytes || !buffer)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else
err = iso7816_get_challenge (card->slot, nbytes, buffer);
unlock_card (card);
return err;
}
/* Perform a CHANGE REFERENCE DATA or RESET RETRY COUNTER operation. */
gpg_error_t
app_change_pin (card_t card, ctrl_t ctrl, const char *chvnostr,
unsigned int flags,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg)
{
gpg_error_t err;
if (!card || !chvnostr || !*chvnostr || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.change_pin)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.change_pin (card->app, ctrl,
chvnostr, flags, pincb, pincb_arg);
unlock_card (card);
if (opt.verbose)
log_info ("operation change_pin result: %s\n", gpg_strerror (err));
return err;
}
/* Perform a VERIFY operation without doing anything else. This may
be used to initialize a the PIN cache for long lasting other
operations. Its use is highly application dependent. */
gpg_error_t
app_check_pin (card_t card, ctrl_t ctrl, const char *keyidstr,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg)
{
gpg_error_t err;
if (!card || !keyidstr || !*keyidstr || !pincb)
return gpg_error (GPG_ERR_INV_VALUE);
err = lock_card (card, ctrl);
if (err)
return err;
if (!card->ref_count || !card->app)
err = gpg_error (GPG_ERR_CARD_NOT_INITIALIZED);
else if (!card->app->fnc.check_pin)
err = gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
else
err = card->app->fnc.check_pin (card->app, keyidstr, pincb, pincb_arg);
unlock_card (card);
if (opt.verbose)
log_info ("operation check_pin result: %s\n", gpg_strerror (err));
return err;
}
static void
report_change (int slot, int old_status, int cur_status)
{
char *homestr, *envstr;
char *fname;
char templ[50];
FILE *fp;
snprintf (templ, sizeof templ, "reader_%d.status", slot);
fname = make_filename (gnupg_homedir (), templ, NULL );
fp = fopen (fname, "w");
if (fp)
{
fprintf (fp, "%s\n",
(cur_status & 1)? "USABLE":
(cur_status & 4)? "ACTIVE":
(cur_status & 2)? "PRESENT": "NOCARD");
fclose (fp);
}
xfree (fname);
homestr = make_filename (gnupg_homedir (), NULL);
if (gpgrt_asprintf (&envstr, "GNUPGHOME=%s", homestr) < 0)
log_error ("out of core while building environment\n");
else
{
gpg_error_t err;
const char *args[9], *envs[2];
char numbuf1[30], numbuf2[30], numbuf3[30];
envs[0] = envstr;
envs[1] = NULL;
sprintf (numbuf1, "%d", slot);
sprintf (numbuf2, "0x%04X", old_status);
sprintf (numbuf3, "0x%04X", cur_status);
args[0] = "--reader-port";
args[1] = numbuf1;
args[2] = "--old-code";
args[3] = numbuf2;
args[4] = "--new-code";
args[5] = numbuf3;
args[6] = "--status";
args[7] = ((cur_status & 1)? "USABLE":
(cur_status & 4)? "ACTIVE":
(cur_status & 2)? "PRESENT": "NOCARD");
args[8] = NULL;
fname = make_filename (gnupg_homedir (), "scd-event", NULL);
err = gnupg_spawn_process_detached (fname, args, envs);
if (err && gpg_err_code (err) != GPG_ERR_ENOENT)
log_error ("failed to run event handler '%s': %s\n",
fname, gpg_strerror (err));
xfree (fname);
xfree (envstr);
}
xfree (homestr);
}
int
scd_update_reader_status_file (void)
{
card_t card, card_next;
int periodical_check_needed = 0;
npth_mutex_lock (&card_list_lock);
for (card = card_top; card; card = card_next)
{
int sw;
unsigned int status;
lock_card (card, NULL);
card_next = card->next;
if (card->reset_requested)
status = 0;
else
{
sw = apdu_get_status (card->slot, 0, &status);
if (sw == SW_HOST_NO_READER)
{
/* Most likely the _reader_ has been unplugged. */
status = 0;
}
else if (sw)
{
/* Get status failed. Ignore that. */
if (card->periodical_check_needed)
periodical_check_needed = 1;
unlock_card (card);
continue;
}
}
if (card->card_status != status)
{
report_change (card->slot, card->card_status, status);
send_client_notifications (card, status == 0);
if (status == 0)
{
log_debug ("Removal of a card: %d\n", card->slot);
apdu_close_reader (card->slot);
deallocate_card (card);
}
else
{
card->card_status = status;
if (card->periodical_check_needed)
periodical_check_needed = 1;
unlock_card (card);
}
}
else
{
if (card->periodical_check_needed)
periodical_check_needed = 1;
unlock_card (card);
}
}
npth_mutex_unlock (&card_list_lock);
return periodical_check_needed;
}
/* This function must be called once to initialize this module. This
has to be done before a second thread is spawned. We can't do the
static initialization because Pth emulation code might not be able
to do a static init; in particular, it is not possible for W32. */
gpg_error_t
initialize_module_command (void)
{
gpg_error_t err;
if (npth_mutex_init (&card_list_lock, NULL))
{
err = gpg_error_from_syserror ();
log_error ("app: error initializing mutex: %s\n", gpg_strerror (err));
return err;
}
return apdu_init ();
}
void
app_send_card_list (ctrl_t ctrl)
{
card_t c;
char buf[65];
npth_mutex_lock (&card_list_lock);
for (c = card_top; c; c = c->next)
{
if (DIM (buf) < 2 * c->serialnolen + 1)
continue;
bin2hex (c->serialno, c->serialnolen, buf);
send_status_direct (ctrl, "SERIALNO", buf);
}
npth_mutex_unlock (&card_list_lock);
}
/* Execute an action for each app. ACTION can be one of:
*
* - KEYGRIP_ACTION_SEND_DATA
*
* If KEYGRIP_STR matches a public key of any active application
* send information as LF terminated data lines about the public
* key. The format of these lines is
* <keygrip> T <serialno> <idstr>
* If a match was found a pointer to the matching application is
* returned. With the KEYGRIP_STR given as NULL, lines for all
* keys will be send and the return value is NULL.
*
* - KEYGRIP_ACTION_WRITE_STATUS
*
* Same as KEYGRIP_ACTION_SEND_DATA but uses status lines instead
* of data lines.
*
* - KEYGRIP_ACTION_LOOKUP
*
* Returns a pointer to the application matching KEYGRIP_STR but
* does not emit any status or data lines. If no key with that
* keygrip is available or KEYGRIP_STR is NULL, NULL is returned.
*/
card_t
app_do_with_keygrip (ctrl_t ctrl, int action, const char *keygrip_str)
{
card_t c;
app_t a;
npth_mutex_lock (&card_list_lock);
for (c = card_top; c; c = c->next)
for (a = c->app; a; a = a->next)
if (a->fnc.with_keygrip
&& !a->fnc.with_keygrip (a, ctrl, action, keygrip_str))
break;
/* FIXME: Add app switching logic. The above code assumes that the
* actions can be performend without switching. This needs to be
* checked. For a lookup we also need to reorder the apps so that
* the selected one will be used. */
npth_mutex_unlock (&card_list_lock);
return c;
}
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