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/*
SSSD
Helper child to commmunicate with passkey devices
Authors:
Iker Pedrosa <ipedrosa@redhat.com>
Copyright (C) 2022 Red Hat
This program 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.
This program 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 <http://www.gnu.org/licenses/>.
*/
#include "util/debug.h"
#include "util/util.h"
#include "passkey_child.h"
errno_t
list_devices(fido_dev_info_t *dev_list, size_t *dev_number)
{
errno_t ret;
for (int i = 0; i < TIMEOUT; i += FREQUENCY) {
ret = fido_dev_info_manifest(dev_list, DEVLIST_SIZE, dev_number);
if (ret != FIDO_OK) {
DEBUG(SSSDBG_OP_FAILURE,
"Unable to discover device(s) [%d]: %s.\n",
ret, fido_strerr(ret));
}
if ((*dev_number) != 0) {
DEBUG(SSSDBG_TRACE_FUNC, "Device found.\n");
break;
}
if (i < (TIMEOUT - 1)) {
DEBUG(SSSDBG_TRACE_FUNC, "No device available, retrying.\n");
sleep(FREQUENCY);
}
}
return ret;
}
errno_t
select_device(enum action_opt action, fido_dev_info_t *dev_list,
size_t dev_list_len, fido_assert_t *assert,
fido_dev_t **_dev)
{
fido_dev_t *dev = NULL;
const char *path;
const fido_dev_info_t *di = NULL;
errno_t ret;
if (dev_list_len == 0) {
DEBUG(SSSDBG_OP_FAILURE, "No device found. Aborting.\n");
ret = ENOENT;
goto done;
} else if (action == ACTION_REGISTER && dev_list_len == 1) {
dev = fido_dev_new();
if (dev == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_new failed.\n");
ret = ENOMEM;
goto done;
}
di = fido_dev_info_ptr(dev_list, 0);
if (di == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_info_ptr failed.\n");
ret = ENOMEM;
goto done;
}
path = fido_dev_info_path(di);
if (path == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_info_path failed.\n");
ret = ENOMEM;
goto done;
}
ret = fido_dev_open(dev, path);
if (ret != FIDO_OK) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_open failed [%d]: %s.\n",
ret, fido_strerr(ret));
goto done;
}
*_dev = dev;
} else if (action == ACTION_REGISTER && dev_list_len > 1) {
DEBUG(SSSDBG_OP_FAILURE,
"Only one device is supported at a time. Aborting.\n");
fprintf(stderr, "Only one device is supported at a time. Aborting.\n");
ret = EPERM;
goto done;
} else {
if (assert == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "assert cannot be NULL.\n");
ret = EINVAL;
goto done;
}
ret = select_from_multiple_devices(dev_list, dev_list_len, assert, _dev);
if (ret != FIDO_OK) {
goto done;
}
}
ret = EOK;
done:
if (ret != EOK) {
if (dev != NULL) {
fido_dev_close(dev);
}
fido_dev_free(&dev);
}
return ret;
}
errno_t
select_from_multiple_devices(fido_dev_info_t *dev_list,
size_t dev_list_len,
fido_assert_t *assert,
fido_dev_t **_dev)
{
fido_dev_t *dev = NULL;
const fido_dev_info_t *di = NULL;
const char *path;
bool is_fido2;
errno_t ret;
DEBUG(SSSDBG_TRACE_FUNC,
"Working with %ld authenticator(s).\n", dev_list_len);
for (size_t i = 0; i < dev_list_len; i++) {
dev = fido_dev_new();
if (dev == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_new failed.\n");
ret = ENOMEM;
goto done;
}
di = fido_dev_info_ptr(dev_list, i);
if (di == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_info_ptr failed.\n");
ret = ENOMEM;
goto done;
}
path = fido_dev_info_path(di);
if (path == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_info_path failed.\n");
ret = ENOMEM;
goto done;
}
ret = fido_dev_open(dev, path);
if (ret != FIDO_OK) {
DEBUG(SSSDBG_OP_FAILURE, "fido_dev_open failed [%d]: %s.\n",
ret, fido_strerr(ret));
}
is_fido2 = fido_dev_is_fido2(dev);
ret = fido_dev_get_assert(dev, assert, NULL);
if ((is_fido2 == false && ret == FIDO_ERR_USER_PRESENCE_REQUIRED)
|| (is_fido2 == true && ret == FIDO_OK)) {
*_dev = dev;
DEBUG(SSSDBG_FUNC_DATA, "Assertion found in passkey %ld.\n", i);
ret = EOK;
goto done;
}
DEBUG(SSSDBG_FUNC_DATA, "Assertion not found in passkey %ld.\n", i);
fido_dev_close(dev);
fido_dev_free(&dev);
}
ret = FIDO_ERR_NOTFOUND;
DEBUG(SSSDBG_OP_FAILURE, "Assertion not found.\n");
done:
return ret;
}
errno_t
get_device_options(fido_dev_t *dev, struct passkey_data *_data)
{
bool has_pin;
bool has_uv;
bool supports_uv;
errno_t ret;
has_uv = fido_dev_has_uv(dev);
has_pin = fido_dev_has_pin(dev);
supports_uv = fido_dev_supports_uv(dev);
if (_data->user_verification == FIDO_OPT_TRUE && has_pin != true
&& has_uv != true) {
DEBUG(SSSDBG_OP_FAILURE,
"Policy enabled user-verification but there isn't any "
"verification method set.\n");
ret = EINVAL;
goto done;
}
if (_data->user_verification == FIDO_OPT_OMIT
&& (has_uv == true || has_pin == true)) {
DEBUG(SSSDBG_CONF_SETTINGS,
"Policy didn't indicate any preference for user-verification "
"but the key settings are enforcing it. Thus, enforcing the "
"user-verification.\n");
_data->user_verification = FIDO_OPT_TRUE;
ret = EOK;
goto done;
}
if (_data->user_verification == FIDO_OPT_FALSE
&& supports_uv == false) {
DEBUG(SSSDBG_CONF_SETTINGS,
"Policy disabled user-verification but the key doesn't support "
"it. Thus, omitting the user-verification.\n");
_data->user_verification = FIDO_OPT_OMIT;
ret = EOK;
goto done;
}
ret = EOK;
done:
return ret;
}
|
