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fix(core): Improve error handling and range checking in modtrezorconfig.

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This commit is contained in:
Andrew Kozlik 2021-03-10 14:43:21 +01:00 committed by Andrew Kozlik
parent 23abf7aff0
commit 2836bfc64c
7 changed files with 79 additions and 39 deletions
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60
core/embed/extmod/modtrezorconfig/modtrezorconfig.c
View File

@ -259,7 +259,10 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(
/// value fails.
/// """
STATIC mp_obj_t mod_trezorconfig_get(size_t n_args, const mp_obj_t *args) {
uint8_t app = trezor_obj_get_uint8(args[0]) & FLAGS_APPID;
uint8_t app = trezor_obj_get_uint8(args[0]);
if (app == 0 || app > MAX_APPID) {
mp_raise_msg(&mp_type_ValueError, "Invalid app ID.");
}
uint8_t key = trezor_obj_get_uint8(args[1]);
if (n_args > 2 && args[2] == mp_const_true) {
app |= FLAG_PUBLIC;
@ -288,7 +291,10 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorconfig_get_obj, 2, 3,
/// Sets a value of given key for given app.
/// """
STATIC mp_obj_t mod_trezorconfig_set(size_t n_args, const mp_obj_t *args) {
uint8_t app = trezor_obj_get_uint8(args[0]) & FLAGS_APPID;
uint8_t app = trezor_obj_get_uint8(args[0]);
if (app == 0 || app > MAX_APPID) {
mp_raise_msg(&mp_type_ValueError, "Invalid app ID.");
}
uint8_t key = trezor_obj_get_uint8(args[1]);
if (n_args > 3 && args[3] == mp_const_true) {
app |= FLAG_PUBLIC;
@ -296,7 +302,8 @@ STATIC mp_obj_t mod_trezorconfig_set(size_t n_args, const mp_obj_t *args) {
uint16_t appkey = (app << 8) | key;
mp_buffer_info_t value;
mp_get_buffer_raise(args[2], &value, MP_BUFFER_READ);
if (sectrue != storage_set(appkey, value.buf, value.len)) {
if (value.len > UINT16_MAX ||
sectrue != storage_set(appkey, value.buf, value.len)) {
mp_raise_msg(&mp_type_RuntimeError, "Could not save value");
}
return mp_const_none;
@ -304,34 +311,48 @@ STATIC mp_obj_t mod_trezorconfig_set(size_t n_args, const mp_obj_t *args) {
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorconfig_set_obj, 3, 4,
mod_trezorconfig_set);
/// def delete(app: int, key: int, public: bool = False) -> bool:
/// def delete(
/// app: int, key: int, public: bool = False, writable_locked: bool = False
/// ) -> bool:
/// """
/// Deletes the given key of the given app.
/// """
STATIC mp_obj_t mod_trezorconfig_delete(size_t n_args, const mp_obj_t *args) {
uint8_t app = trezor_obj_get_uint8(args[0]) & FLAGS_APPID;
uint8_t app = trezor_obj_get_uint8(args[0]);
if (app == 0 || app > MAX_APPID) {
mp_raise_msg(&mp_type_ValueError, "Invalid app ID.");
}
uint8_t key = trezor_obj_get_uint8(args[1]);
if (n_args > 2 && args[2] == mp_const_true) {
app |= FLAG_PUBLIC;
}
if (n_args > 3 && args[3] == mp_const_true) {
app |= FLAGS_WRITE;
if (args[2] != mp_const_true) {
mp_raise_msg(&mp_type_ValueError, "Writable entry must be public.");
}
}
uint16_t appkey = (app << 8) | key;
if (sectrue != storage_delete(appkey)) {
return mp_const_false;
}
return mp_const_true;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorconfig_delete_obj, 2, 3,
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorconfig_delete_obj, 2, 4,
mod_trezorconfig_delete);
/// def set_counter(
/// app: int, key: int, count: int, writable_locked: bool = False
/// ) -> bool:
/// ) -> None:
/// """
/// Sets the given key of the given app as a counter with the given value.
/// """
STATIC mp_obj_t mod_trezorconfig_set_counter(size_t n_args,
const mp_obj_t *args) {
uint8_t app = trezor_obj_get_uint8(args[0]) & FLAGS_APPID;
uint8_t app = trezor_obj_get_uint8(args[0]);
if (app == 0 || app > MAX_APPID) {
mp_raise_msg(&mp_type_ValueError, "Invalid app ID.");
}
uint8_t key = trezor_obj_get_uint8(args[1]);
if (n_args > 3 && args[3] == mp_const_true) {
app |= FLAGS_WRITE;
@ -339,31 +360,28 @@ STATIC mp_obj_t mod_trezorconfig_set_counter(size_t n_args,
app |= FLAG_PUBLIC;
}
uint16_t appkey = (app << 8) | key;
if (args[2] == mp_const_none) {
if (sectrue != storage_delete(appkey)) {
return mp_const_false;
}
} else {
uint32_t count = trezor_obj_get_uint(args[2]);
if (sectrue != storage_set_counter(appkey, count)) {
return mp_const_false;
}
mp_uint_t count = trezor_obj_get_uint(args[2]);
if (count > UINT32_MAX || sectrue != storage_set_counter(appkey, count)) {
mp_raise_msg(&mp_type_RuntimeError, "Failed to set value in storage.");
}
return mp_const_true;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorconfig_set_counter_obj, 3,
4, mod_trezorconfig_set_counter);
/// def next_counter(
/// app: int, key: int, writable_locked: bool = False,
/// ) -> Optional[int]:
/// ) -> int:
/// """
/// Increments the counter stored under the given key of the given app and
/// returns the new value.
/// """
STATIC mp_obj_t mod_trezorconfig_next_counter(size_t n_args,
const mp_obj_t *args) {
uint8_t app = trezor_obj_get_uint8(args[0]) & FLAGS_APPID;
uint8_t app = trezor_obj_get_uint8(args[0]);
if (app == 0 || app > MAX_APPID) {
mp_raise_msg(&mp_type_ValueError, "Invalid app ID.");
}
uint8_t key = trezor_obj_get_uint8(args[1]);
if (n_args > 2 && args[2] == mp_const_true) {
app |= FLAGS_WRITE;
@ -373,7 +391,7 @@ STATIC mp_obj_t mod_trezorconfig_next_counter(size_t n_args,
uint16_t appkey = (app << 8) | key;
uint32_t count = 0;
if (sectrue != storage_next_counter(appkey, &count)) {
return mp_const_none;
mp_raise_msg(&mp_type_RuntimeError, "Failed to set value in storage.");
}
return mp_obj_new_int_from_uint(count);
}

8
core/mocks/generated/trezorconfig.pyi
View File

@ -109,7 +109,9 @@ def set(app: int, key: int, value: bytes, public: bool = False) -> None:
# extmod/modtrezorconfig/modtrezorconfig.c
def delete(app: int, key: int, public: bool = False) -> bool:
def delete(
app: int, key: int, public: bool = False, writable_locked: bool = False
) -> bool:
"""
Deletes the given key of the given app.
"""
@ -118,7 +120,7 @@ def delete(app: int, key: int, public: bool = False) -> bool:
# extmod/modtrezorconfig/modtrezorconfig.c
def set_counter(
app: int, key: int, count: int, writable_locked: bool = False
) -> bool:
) -> None:
"""
Sets the given key of the given app as a counter with the given value.
"""
@ -127,7 +129,7 @@ def set_counter(
# extmod/modtrezorconfig/modtrezorconfig.c
def next_counter(
app: int, key: int, writable_locked: bool = False,
) -> Optional[int]:
) -> int:
"""
Increments the counter stored under the given key of the given app and
returns the new value.

14
core/src/storage/common.py
View File

@ -28,8 +28,10 @@ def get(app: int, key: int, public: bool = False) -> Optional[bytes]:
return config.get(app, key, public)
def delete(app: int, key: int, public: bool = False) -> None:
config.delete(app, key, public)
def delete(
app: int, key: int, public: bool = False, writable_locked: bool = False
) -> None:
config.delete(app, key, public, writable_locked)
def set_true_or_delete(app: int, key: int, value: bool) -> None:
@ -72,9 +74,9 @@ def get_uint16(app: int, key: int) -> Optional[int]:
return int.from_bytes(val, "big")
def next_counter(app: int, key: int, public: bool = False) -> Optional[int]:
return config.next_counter(app, key, public)
def next_counter(app: int, key: int, writable_locked: bool = False) -> int:
return config.next_counter(app, key, writable_locked)
def set_counter(app: int, key: int, count: int, public: bool = False) -> None:
config.set_counter(app, key, count, public)
def set_counter(app: int, key: int, count: int, writable_locked: bool = False) -> None:
config.set_counter(app, key, count, writable_locked)

6
core/src/storage/device.py
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@ -243,12 +243,12 @@ def set_autolock_delay_ms(delay_ms: int) -> None:
common.set(_NAMESPACE, _AUTOLOCK_DELAY_MS, delay_ms.to_bytes(4, "big"))
def next_u2f_counter() -> Optional[int]:
return common.next_counter(_NAMESPACE, U2F_COUNTER, True) # writable when locked
def next_u2f_counter() -> int:
return common.next_counter(_NAMESPACE, U2F_COUNTER, writable_locked=True)
def set_u2f_counter(count: int) -> None:
common.set_counter(_NAMESPACE, U2F_COUNTER, count, True) # writable when locked
common.set_counter(_NAMESPACE, U2F_COUNTER, count, writable_locked=True)
def set_slip39_identifier(identifier: int) -> None:

2
core/tests/test_storage.py
View File

@ -15,8 +15,6 @@ class TestConfig(unittest.TestCase):
self.assertEqual(device.next_u2f_counter(), i)
device.set_u2f_counter(0)
self.assertEqual(device.next_u2f_counter(), 1)
device.set_u2f_counter(None)
self.assertEqual(device.next_u2f_counter(), 0)
if __name__ == '__main__':

24
core/tests/test_trezor.config.py
View File

@ -92,7 +92,7 @@ class TestConfig(unittest.TestCase):
# The APP namespace which is reserved for storage related values is inaccessible even
# when unlocked.
with self.assertRaises(RuntimeError):
with self.assertRaises(ValueError):
config.set(PINAPP, PINKEY, b'value')
self.assertTrue(config.change_pin(old_pin, new_pin, None, None))
@ -106,7 +106,8 @@ class TestConfig(unittest.TestCase):
# The APP namespace which is reserved for storage related values is inaccessible even
# when unlocked.
self.assertEqual(config.get(PINAPP, PINKEY), None)
with self.assertRaises(ValueError):
config.get(PINAPP, PINKEY)
# Old PIN cannot be used to unlock storage.
if old_pin != new_pin:
@ -169,6 +170,25 @@ class TestConfig(unittest.TestCase):
value2 = config.get(appid, key)
self.assertEqual(value, value2)
# Test value deletion.
self.assertTrue(config.delete(appid, key))
self.assertIsNone(config.get(appid, key))
self.assertFalse(config.delete(appid, key))
# Test get/set for APP out ouf range.
with self.assertRaises(ValueError):
config.set(0, 1, b'test')
with self.assertRaises(ValueError):
config.get(0, 1)
with self.assertRaises(ValueError):
config.set(192, 1, b'test')
with self.assertRaises(ValueError):
config.get(192, 1)
def test_compact(self):
config.init()
config.wipe()

4
storage/storage.h
View File

@ -34,8 +34,8 @@
// can be written even when the storage is locked.
#define FLAGS_WRITE 0xC0
// Mask for extracting the "real" app_id.
#define FLAGS_APPID 0x3F
// The maximum value of app_id which is the six least significant bits of APP.
#define MAX_APPID 0x3F
// The PIN value corresponding to an empty PIN.
extern const uint8_t *PIN_EMPTY;