core: use wire.PinCancelled/PinInvalid instead of custom versions

also refactor show_pin_invalid and its usages so that it raises directly

note that we are now using PinCancelled instead of ActionCancelled where
appropriate

core/src/apps/common/request_pin.py

@@ -10,20 +10,12 @@ from trezor.ui.text import Text
 from apps.common.sdcard import SdCardUnavailable, request_sd_salt
 
 if False:
-    from typing import Any, Optional, Tuple
+    from typing import Any, NoReturn, Optional, Tuple
 
 if __debug__:
     from apps.debug import input_signal
 
 
-class PinCancelled(Exception):
-    pass
-
-
-class PinInvalid(Exception):
-    pass
-
-
 async def request_pin(
     prompt: str = "Enter your PIN",
     attempts_remaining: int = None,
@@ -44,19 +36,16 @@ async def request_pin(
         else:
             pin = await dialog
         if pin is CANCELLED:
-            raise PinCancelled
+            raise wire.PinCancelled
         assert isinstance(pin, str)
         return pin
 
 
 async def request_pin_ack(ctx: wire.Context, *args: Any, **kwargs: Any) -> str:
-    try:
     await ctx.call(ButtonRequest(code=ButtonRequestType.Other), ButtonAck)
     pin = await ctx.wait(request_pin(*args, **kwargs))
     assert isinstance(pin, str)
     return pin
-    except PinCancelled:
-        raise wire.ActionCancelled("Cancelled")
 
 
 async def request_pin_confirm(ctx: wire.Context, *args: Any, **kwargs: Any) -> str:
@@ -103,7 +92,7 @@ async def verify_user_pin(
     try:
         salt = await request_sd_salt()
     except SdCardUnavailable:
-        raise PinCancelled
+        raise wire.PinCancelled("SD salt is unavailable")
     if config.unlock(pin_to_int(pin), salt):
         return
     elif not config.has_pin():
@@ -116,20 +105,22 @@ async def verify_user_pin(
         if config.unlock(pin_to_int(pin), salt):
             return
 
-    raise PinInvalid
+    raise wire.PinInvalid
 
 
-async def show_pin_invalid(ctx: wire.Context) -> None:
+async def error_pin_invalid(ctx: wire.Context) -> NoReturn:
     from apps.common.confirm import confirm
 
     text = Text("Wrong PIN", ui.ICON_WRONG, ui.RED)
     text.normal("The PIN you entered is", "invalid.")
     await confirm(ctx, text, confirm=None, cancel="Close")
+    raise wire.PinInvalid
 
 
-async def show_pin_matches_wipe_code(ctx: wire.Context) -> None:
+async def error_pin_matches_wipe_code(ctx: wire.Context) -> NoReturn:
     from apps.common.confirm import confirm
 
     text = Text("Invalid PIN", ui.ICON_WRONG, ui.RED)
     text.normal("The new PIN must be", "different from your", "wipe code.")
     await confirm(ctx, text, confirm=None, cancel="Close")
+    raise wire.PinInvalid

core/src/apps/management/change_pin.py

@@ -7,10 +7,10 @@ from trezor.ui.text import Text
 from apps.common.confirm import require_confirm
 from apps.common.layout import show_success
 from apps.common.request_pin import (
+    error_pin_invalid,
+    error_pin_matches_wipe_code,
     request_pin_and_sd_salt,
     request_pin_confirm,
-    show_pin_invalid,
-    show_pin_matches_wipe_code,
 )
 
 if False:
@@ -30,8 +30,7 @@ async def change_pin(ctx: wire.Context, msg: ChangePin) -> Success:
     # if changing pin, pre-check the entered pin before getting new pin
     if curpin and not msg.remove:
         if not config.check_pin(pin_to_int(curpin), salt):
-            await show_pin_invalid(ctx)
-            raise wire.PinInvalid("PIN invalid")
+            await error_pin_invalid(ctx)
 
     # get new pin
     if not msg.remove:
@@ -42,10 +41,9 @@ async def change_pin(ctx: wire.Context, msg: ChangePin) -> Success:
     # write into storage
     if not config.change_pin(pin_to_int(curpin), pin_to_int(newpin), salt, salt):
         if newpin:
-            await show_pin_matches_wipe_code(ctx)
+            await error_pin_matches_wipe_code(ctx)
         else:
-            await show_pin_invalid(ctx)
-        raise wire.PinInvalid("PIN invalid")
+            await error_pin_invalid(ctx)
 
     if newpin:
         if curpin:

core/src/apps/management/change_wipe_code.py

@@ -8,9 +8,9 @@ from trezor.ui.text import Text
 from apps.common.confirm import require_confirm
 from apps.common.layout import show_success
 from apps.common.request_pin import (
+    error_pin_invalid,
     request_pin_ack,
     request_pin_and_sd_salt,
-    show_pin_invalid,
 )
 
 if False:
@@ -31,8 +31,7 @@ async def change_wipe_code(ctx: wire.Context, msg: ChangeWipeCode) -> Success:
     if not msg.remove:
         # Pre-check the entered PIN.
         if config.has_pin() and not config.check_pin(pin_to_int(pin), salt):
-            await show_pin_invalid(ctx)
-            raise wire.PinInvalid("PIN invalid")
+            await error_pin_invalid(ctx)
 
         # Get new wipe code.
         wipe_code = await _request_wipe_code_confirm(ctx, pin)
@@ -41,8 +40,7 @@ async def change_wipe_code(ctx: wire.Context, msg: ChangeWipeCode) -> Success:
 
     # Write into storage.
     if not config.change_wipe_code(pin_to_int(pin), salt, pin_to_int(wipe_code)):
-        await show_pin_invalid(ctx)
-        raise wire.PinInvalid("PIN invalid")
+        await error_pin_invalid(ctx)
 
     if wipe_code:
         if has_wipe_code:

core/src/apps/management/recovery_device/__init__.py

@@ -9,9 +9,9 @@ from trezor.ui.text import Text
 
 from apps.common.confirm import require_confirm
 from apps.common.request_pin import (
+    error_pin_invalid,
     request_pin_and_sd_salt,
     request_pin_confirm,
-    show_pin_invalid,
 )
 from apps.management.recovery_device.homescreen import (
     recovery_homescreen,
@@ -46,8 +46,7 @@ async def recovery_device(ctx: wire.Context, msg: RecoveryDevice) -> Success:
     if msg.dry_run:
         curpin, salt = await request_pin_and_sd_salt(ctx, "Enter PIN")
         if not config.check_pin(pin_to_int(curpin), salt):
-            await show_pin_invalid(ctx)
-            raise wire.PinInvalid("PIN invalid")
+            await error_pin_invalid(ctx)
 
     if not msg.dry_run:
         # set up pin if requested

core/src/apps/management/sd_protect.py

@@ -10,9 +10,9 @@ from trezor.ui.text import Text
 from apps.common.confirm import require_confirm
 from apps.common.layout import show_success
 from apps.common.request_pin import (
+    error_pin_invalid,
     request_pin_ack,
     request_pin_and_sd_salt,
-    show_pin_invalid,
 )
 from apps.common.sdcard import ensure_sdcard, sd_problem_dialog
 
@@ -83,8 +83,7 @@ async def sd_protect_enable(ctx: wire.Context, msg: SdProtect) -> Success:
             # SD-protection. If it fails for any reason, we suppress the
             # exception, because primarily we need to raise wire.PinInvalid.
             pass
-        await show_pin_invalid(ctx)
-        raise wire.PinInvalid("PIN invalid")
+        await error_pin_invalid(ctx)
 
     storage.device.set_sd_salt_auth_key(salt_auth_key)
 
@@ -107,8 +106,7 @@ async def sd_protect_disable(ctx: wire.Context, msg: SdProtect) -> Success:
 
     # Check PIN and remove salt.
     if not config.change_pin(pin_to_int(pin), pin_to_int(pin), salt, None):
-        await show_pin_invalid(ctx)
-        raise wire.PinInvalid("PIN invalid")
+        await error_pin_invalid(ctx)
 
     storage.device.set_sd_salt_auth_key(None)
 
@@ -143,8 +141,7 @@ async def sd_protect_refresh(ctx: wire.Context, msg: SdProtect) -> Success:
     await _set_salt(ctx, new_salt, new_salt_tag, stage=True)
 
     if not config.change_pin(pin_to_int(pin), pin_to_int(pin), old_salt, new_salt):
-        await show_pin_invalid(ctx)
-        raise wire.PinInvalid("PIN invalid")
+        await error_pin_invalid(ctx)
 
     storage.device.set_sd_salt_auth_key(new_auth_key)
 

core/src/apps/webauthn/fido2.py

@@ -576,7 +576,8 @@ class KeepaliveCallback:
 
 
 async def verify_user(keepalive_callback: KeepaliveCallback) -> bool:
-    from apps.common.request_pin import verify_user_pin, PinCancelled, PinInvalid
+    from trezor.wire import PinCancelled, PinInvalid
+    from apps.common.request_pin import verify_user_pin
     import trezor.pin
 
     try:

core/src/boot.py

@@ -1,10 +1,10 @@
 import storage
 import storage.device
 import storage.sd_salt
-from trezor import config, log, loop, res, ui, utils
+from trezor import config, log, loop, res, ui, utils, wire
 from trezor.pin import show_pin_timeout
 
-from apps.common.request_pin import PinCancelled, verify_user_pin
+from apps.common.request_pin import verify_user_pin
 
 
 async def bootscreen() -> None:
@@ -16,12 +16,11 @@ async def bootscreen() -> None:
             await verify_user_pin()
             storage.init_unlocked()
             return
-        except PinCancelled as e:
+        except wire.PinCancelled:
             # verify_user_pin will convert a SdCardUnavailable (in case of sd salt)
             # to PinCancelled exception.
-            # log the exception and retry loop
-            if __debug__:
-                log.exception(__name__, e)
+            # Ignore exception, retry loop.
+            pass
         except BaseException as e:
             # other exceptions here are unexpected and should halt the device
             if __debug__: