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libfprint/examples/verify.c
Marco Trevisan (Treviño) 3b993fabb6 verify/enroll: Save and use locally saved prints also for devices with storage 
Some devices have storage but that's is limited enough not to be able
to store all the metadata, but just a fingerprint id.

In such case we also need to use the local storage to be able to verify.
Fprintd does this already, but we don't do it in the libfprint examples.

So, in in case we enroll, always save the print information to the disk,
while in case we verify we try to load the print from disk and we use
that in case its private data matches the one provided by the device.
2020-11-08 22:19:23 +01:00

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/*
* Example fingerprint verification program, which verifies the
* finger which has been previously enrolled to disk.
* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
* Copyright (C) 2019 Marco Trevisan <marco.trevisan@canonical.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define FP_COMPONENT "example-verify"
#include <stdio.h>
#include <libfprint/fprint.h>
#include <glib-unix.h>
#include "storage.h"
#include "utilities.h"
typedef struct _VerifyData
{
GMainLoop *loop;
GCancellable *cancellable;
unsigned int sigint_handler;
FpFinger finger;
int ret_value;
} VerifyData;
static void
verify_data_free (VerifyData *verify_data)
{
g_clear_handle_id (&verify_data->sigint_handler, g_source_remove);
g_clear_object (&verify_data->cancellable);
g_main_loop_unref (verify_data->loop);
g_free (verify_data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (VerifyData, verify_data_free)
static void
on_device_closed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(GError) error = NULL;
fp_device_close_finish (dev, res, &error);
if (error)
g_warning ("Failed closing device %s", error->message);
g_main_loop_quit (verify_data->loop);
}
static void
verify_quit (FpDevice *dev,
VerifyData *verify_data)
{
if (!fp_device_is_open (dev))
{
g_main_loop_quit (verify_data->loop);
return;
}
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed, verify_data);
}
static void start_verification (FpDevice *dev,
VerifyData *verify_data);
static void
on_verify_completed (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(FpPrint) print = NULL;
g_autoptr(GError) error = NULL;
char buffer[20];
gboolean match;
if (!fp_device_verify_finish (dev, res, &match, &print, &error))
{
g_warning ("Failed to verify print: %s", error->message);
verify_data->ret_value = EXIT_FAILURE;
if (error->domain != FP_DEVICE_RETRY)
{
verify_quit (dev, verify_data);
return;
}
}
g_print ("Verify again? [Y/n]? ");
if (fgets (buffer, sizeof (buffer), stdin) &&
(buffer[0] == 'Y' || buffer[0] == 'y' || buffer[0] == '\n'))
{
start_verification (dev, verify_data);
return;
}
verify_quit (dev, verify_data);
}
static void
on_match_cb (FpDevice *dev, FpPrint *match, FpPrint *print,
gpointer user_data, GError *error)
{
VerifyData *verify_data = user_data;
if (error)
{
g_warning ("Match report: Finger not matched, retry error reported: %s",
error->message);
return;
}
if (print && fp_print_get_image (print) &&
print_image_save (print, "verify.pgm"))
g_print ("Print image saved as verify.pgm\n");
if (match)
{
char date_str[128];
verify_data->ret_value = EXIT_SUCCESS;
g_date_strftime (date_str, G_N_ELEMENTS (date_str), "%Y-%m-%d\0",
fp_print_get_enroll_date (match));
g_debug ("Match report: device %s matched finger %s successifully "
"with print %s, enrolled on date %s by user %s",
fp_device_get_name (dev),
finger_to_string (fp_print_get_finger (match)),
fp_print_get_description (match), date_str,
fp_print_get_username (match));
g_print ("MATCH!\n");
}
else
{
g_debug ("Match report: Finger not matched");
g_print ("NO MATCH!\n");
}
}
static FpPrint *
get_stored_print (FpDevice *dev, VerifyData *verify_data)
{
FpPrint *verify_print;
g_print ("Loading previously enrolled %s finger data...\n",
finger_to_string (verify_data->finger));
verify_print = print_data_load (dev, verify_data->finger);
if (!verify_print)
{
g_warning ("Failed to load fingerprint data");
g_warning ("Did you remember to enroll your %s finger first?",
finger_to_string (verify_data->finger));
}
return verify_print;
}
static void
on_list_completed (FpDevice *dev, GAsyncResult *res, gpointer user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(GPtrArray) prints = NULL;
g_autoptr(GError) error = NULL;
prints = fp_device_list_prints_finish (dev, res, &error);
if (!error)
{
FpPrint *verify_print = NULL;
g_autoptr(FpPrint) stored_print = NULL;
guint i;
if (!prints->len)
{
g_warning ("No prints saved on device");
verify_quit (dev, verify_data);
return;
}
stored_print = get_stored_print (dev, verify_data);
for (i = 0; i < prints->len; ++i)
{
FpPrint *print = prints->pdata[i];
if (stored_print && fp_print_equal (stored_print, print))
/* If the private print data matches, let's use the stored print
* as it contains more metadata to show */
print = stored_print;
if (fp_print_get_finger (print) == verify_data->finger &&
g_strcmp0 (fp_print_get_username (print), g_get_user_name ()) == 0)
{
const GDate *verify_print_date = NULL;
const GDate *print_date = fp_print_get_enroll_date (print);
if (verify_print)
verify_print_date = fp_print_get_enroll_date (verify_print);
if (!verify_print || !print_date || !verify_print_date ||
g_date_compare (print_date, verify_print_date) >= 0)
verify_print = print;
}
}
if (!verify_print)
{
verify_quit (dev, verify_data);
return;
}
g_debug ("Comparing print with %s",
fp_print_get_description (verify_print));
g_print ("Print loaded. Time to verify!\n");
fp_device_verify (dev, verify_print, verify_data->cancellable,
on_match_cb, verify_data, NULL,
(GAsyncReadyCallback) on_verify_completed,
verify_data);
}
else
{
g_warning ("Loading prints failed with error %s", error->message);
verify_quit (dev, verify_data);
}
}
static void
start_verification (FpDevice *dev, VerifyData *verify_data)
{
if (verify_data->finger == FP_FINGER_UNKNOWN)
{
g_print ("Choose the finger to verify:\n");
verify_data->finger = finger_chooser ();
}
if (verify_data->finger == FP_FINGER_UNKNOWN)
{
g_warning ("Unknown finger selected");
verify_data->ret_value = EXIT_FAILURE;
verify_quit (dev, verify_data);
return;
}
if (fp_device_has_storage (dev))
{
g_print ("Creating finger template, using device storage...\n");
fp_device_list_prints (dev, NULL,
(GAsyncReadyCallback) on_list_completed,
verify_data);
}
else
{
g_autoptr(FpPrint) verify_print = get_stored_print (dev, verify_data);
if (!verify_print)
{
verify_quit (dev, verify_data);
return;
}
g_print ("Print loaded. Time to verify!\n");
fp_device_verify (dev, verify_print, verify_data->cancellable,
on_match_cb, verify_data, NULL,
(GAsyncReadyCallback) on_verify_completed,
verify_data);
}
}
static void
on_device_opened (FpDevice *dev, GAsyncResult *res, void *user_data)
{
VerifyData *verify_data = user_data;
g_autoptr(GError) error = NULL;
if (!fp_device_open_finish (dev, res, &error))
{
g_warning ("Failed to open device: %s", error->message);
verify_quit (dev, verify_data);
return;
}
g_print ("Opened device. ");
start_verification (dev, verify_data);
}
static gboolean
sigint_cb (void *user_data)
{
VerifyData *verify_data = user_data;
g_cancellable_cancel (verify_data->cancellable);
return G_SOURCE_CONTINUE;
}
int
main (void)
{
g_autoptr(FpContext) ctx = NULL;
g_autoptr(VerifyData) verify_data = NULL;
GPtrArray *devices;
FpDevice *dev;
setenv ("G_MESSAGES_DEBUG", "all", 0);
setenv ("LIBUSB_DEBUG", "3", 0);
ctx = fp_context_new ();
devices = fp_context_get_devices (ctx);
if (!devices)
{
g_warning ("Impossible to get devices");
return EXIT_FAILURE;
}
dev = discover_device (devices);
if (!dev)
{
g_warning ("No devices detected.");
return EXIT_FAILURE;
}
verify_data = g_new0 (VerifyData, 1);
verify_data->ret_value = EXIT_FAILURE;
verify_data->loop = g_main_loop_new (NULL, FALSE);
verify_data->cancellable = g_cancellable_new ();
verify_data->sigint_handler = g_unix_signal_add_full (G_PRIORITY_HIGH,
SIGINT,
sigint_cb,
verify_data,
NULL);
fp_device_open (dev, verify_data->cancellable,
(GAsyncReadyCallback) on_device_opened,
verify_data);
g_main_loop_run (verify_data->loop);
return verify_data->ret_value;
}
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