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/*
* Copyright (c) 2020 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "fido.h"
#include "../openbsd-compat/openbsd-compat.h"
#define FIDO_POLL_MS 50
#if defined(_MSC_VER)
static int
nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
{
if (rmtp != NULL) {
errno = EINVAL;
return (-1);
}
Sleep(rqtp->tv_nsec / 1000000);
return (0);
}
#endif
static fido_dev_t *
open_dev(const fido_dev_info_t *di)
{
fido_dev_t *dev;
int r;
if ((dev = fido_dev_new()) == NULL) {
warnx("%s: fido_dev_new", __func__);
return (NULL);
}
if ((r = fido_dev_open(dev, fido_dev_info_path(di))) != FIDO_OK) {
warnx("%s: fido_dev_open %s: %s", __func__,
fido_dev_info_path(di), fido_strerr(r));
fido_dev_free(&dev);
return (NULL);
}
printf("%s (0x%04x:0x%04x) is %s\n", fido_dev_info_path(di),
fido_dev_info_vendor(di), fido_dev_info_product(di),
fido_dev_is_fido2(dev) ? "fido2" : "u2f");
return (dev);
}
static int
select_dev(const fido_dev_info_t *devlist, size_t ndevs, fido_dev_t **dev,
size_t *idx, int secs)
{
const fido_dev_info_t *di;
fido_dev_t **devtab;
struct timespec ts_start;
struct timespec ts_now;
struct timespec ts_delta;
struct timespec ts_pause;
size_t nopen = 0;
int touched;
int r;
long ms_remain;
*dev = NULL;
*idx = 0;
printf("%u authenticator(s) detected\n", (unsigned)ndevs);
if (ndevs == 0)
return (0); /* nothing to do */
if ((devtab = calloc(ndevs, sizeof(*devtab))) == NULL) {
warn("%s: calloc", __func__);
return (-1);
}
for (size_t i = 0; i < ndevs; i++) {
di = fido_dev_info_ptr(devlist, i);
if ((devtab[i] = open_dev(di)) != NULL) {
*idx = i;
nopen++;
}
}
printf("%u authenticator(s) opened\n", (unsigned)nopen);
if (nopen < 2) {
if (nopen == 1)
*dev = devtab[*idx]; /* single candidate */
r = 0;
goto out;
}
for (size_t i = 0; i < ndevs; i++) {
di = fido_dev_info_ptr(devlist, i);
if (devtab[i] == NULL)
continue; /* failed to open */
if ((r = fido_dev_get_touch_begin(devtab[i])) != FIDO_OK) {
warnx("%s: fido_dev_get_touch_begin %s: %s", __func__,
fido_dev_info_path(di), fido_strerr(r));
r = -1;
goto out;
}
}
if (clock_gettime(CLOCK_MONOTONIC, &ts_start) != 0) {
warn("%s: clock_gettime", __func__);
r = -1;
goto out;
}
ts_pause.tv_sec = 0;
ts_pause.tv_nsec = 200000000; /* 200ms */
do {
nanosleep(&ts_pause, NULL);
for (size_t i = 0; i < ndevs; i++) {
di = fido_dev_info_ptr(devlist, i);
if (devtab[i] == NULL) {
/* failed to open or discarded */
continue;
}
if ((r = fido_dev_get_touch_status(devtab[i], &touched,
FIDO_POLL_MS)) != FIDO_OK) {
warnx("%s: fido_dev_get_touch_status %s: %s",
__func__, fido_dev_info_path(di),
fido_strerr(r));
fido_dev_close(devtab[i]);
fido_dev_free(&devtab[i]);
continue; /* discard */
}
if (touched) {
*dev = devtab[i];
*idx = i;
r = 0;
goto out;
}
}
if (clock_gettime(CLOCK_MONOTONIC, &ts_now) != 0) {
warn("%s: clock_gettime", __func__);
r = -1;
goto out;
}
timespecsub(&ts_now, &ts_start, &ts_delta);
ms_remain = (secs * 1000) - ((long)ts_delta.tv_sec * 1000) +
((long)ts_delta.tv_nsec / 1000000);
} while (ms_remain > FIDO_POLL_MS);
printf("timeout after %d seconds\n", secs);
r = -1;
out:
if (r != 0) {
*dev = NULL;
*idx = 0;
}
for (size_t i = 0; i < ndevs; i++) {
if (devtab[i] && devtab[i] != *dev) {
fido_dev_cancel(devtab[i]);
fido_dev_close(devtab[i]);
fido_dev_free(&devtab[i]);
}
}
free(devtab);
return (r);
}
int
main(void)
{
const fido_dev_info_t *di;
fido_dev_info_t *devlist;
fido_dev_t *dev;
size_t idx;
size_t ndevs;
int r;
fido_init(0);
if ((devlist = fido_dev_info_new(64)) == NULL)
errx(1, "fido_dev_info_new");
if ((r = fido_dev_info_manifest(devlist, 64, &ndevs)) != FIDO_OK)
errx(1, "fido_dev_info_manifest: %s (0x%x)", fido_strerr(r), r);
if (select_dev(devlist, ndevs, &dev, &idx, 15) != 0)
errx(1, "select_dev");
if (dev == NULL)
errx(1, "no authenticator found");
di = fido_dev_info_ptr(devlist, idx);
printf("%s: %s by %s (PIN %sset)\n", fido_dev_info_path(di),
fido_dev_info_product_string(di),
fido_dev_info_manufacturer_string(di),
fido_dev_has_pin(dev) ? "" : "un");
fido_dev_close(dev);
fido_dev_free(&dev);
fido_dev_info_free(&devlist, ndevs);
exit(0);
}
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