|
|
|
|
@ -1,18 +1,57 @@
|
|
|
|
|
"""
|
|
|
|
|
# Wire
|
|
|
|
|
|
|
|
|
|
Handles on-the-wire communication with a host computer. The communication is:
|
|
|
|
|
|
|
|
|
|
- Request / response.
|
|
|
|
|
- Protobuf-encoded, see `protobuf.py`.
|
|
|
|
|
- Wrapped in a simple envelope format, see `trezor/wire/codec_v1.py`.
|
|
|
|
|
- Transferred over USB interface, or UDP in case of Unix emulation.
|
|
|
|
|
|
|
|
|
|
This module:
|
|
|
|
|
|
|
|
|
|
1. Provides API for registering messages. In other words binds what functions are invoked
|
|
|
|
|
when some particular message is received. See the `add` function.
|
|
|
|
|
2. Runs workflows, also called `handlers`, to process the message.
|
|
|
|
|
3. Creates and passes the `Context` object to the handlers. This provides an interface to
|
|
|
|
|
wait, read, write etc. on the wire.
|
|
|
|
|
|
|
|
|
|
## `add` function
|
|
|
|
|
|
|
|
|
|
The `add` function registers what function is invoked when some particular `message_type`
|
|
|
|
|
is received. The following example binds the `apps.wallet.get_address` function with
|
|
|
|
|
the `GetAddress` message:
|
|
|
|
|
|
|
|
|
|
```python
|
|
|
|
|
wire.add(MessageType.GetAddress, "apps.wallet", "get_address")
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## Session handler
|
|
|
|
|
|
|
|
|
|
When the `wire.setup` is called the `handle_session` coroutine is scheduled. The
|
|
|
|
|
`handle_session` waits for some messages to be received on some particular interface and
|
|
|
|
|
reads the message's header. When the message type is known the first handler is called. This way the
|
|
|
|
|
`handle_session` goes through all the workflows.
|
|
|
|
|
|
|
|
|
|
"""
|
|
|
|
|
|
|
|
|
|
import protobuf
|
|
|
|
|
from trezor import log, loop, messages, utils, workflow
|
|
|
|
|
from trezor.messages import FailureType
|
|
|
|
|
from trezor.messages.Failure import Failure
|
|
|
|
|
from trezor.wire import codec_v1
|
|
|
|
|
from trezor.wire.errors import Error
|
|
|
|
|
|
|
|
|
|
# import all errors into namespace, so that `wire.Error` is available elsewhere
|
|
|
|
|
# Import all errors into namespace, so that `wire.Error` is available from
|
|
|
|
|
# other packages.
|
|
|
|
|
from trezor.wire.errors import * # isort:skip # noqa: F401,F403
|
|
|
|
|
|
|
|
|
|
if False:
|
|
|
|
|
from typing import (
|
|
|
|
|
Any,
|
|
|
|
|
Awaitable,
|
|
|
|
|
Dict,
|
|
|
|
|
Callable,
|
|
|
|
|
Dict,
|
|
|
|
|
Iterable,
|
|
|
|
|
List,
|
|
|
|
|
Optional,
|
|
|
|
|
@ -20,61 +59,58 @@ if False:
|
|
|
|
|
Type,
|
|
|
|
|
)
|
|
|
|
|
from trezorio import WireInterface
|
|
|
|
|
from protobuf import LoadedMessageType, MessageType
|
|
|
|
|
|
|
|
|
|
Handler = Callable[..., loop.Task]
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
workflow_handlers = {} # type: Dict[int, Tuple[Handler, Iterable]]
|
|
|
|
|
# Maps a wire type directly to a handler.
|
|
|
|
|
workflow_handlers = {} # type: Dict[int, Handler]
|
|
|
|
|
|
|
|
|
|
# Maps a wire type to a tuple of package and module. This allows handlers
|
|
|
|
|
# to be dynamically imported when such message arrives.
|
|
|
|
|
workflow_packages = {} # type: Dict[int, Tuple[str, str]]
|
|
|
|
|
|
|
|
|
|
# Maps a wire type to a "keychain namespace". Such workflows are created
|
|
|
|
|
# with an instance of `seed.Keychain` with correctly derived keys.
|
|
|
|
|
workflow_namespaces = {} # type: Dict[int, List]
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def add(mtype: int, pkgname: str, modname: str, namespace: List = None) -> None:
|
|
|
|
|
def add(wire_type: int, pkgname: str, modname: str, namespace: List = None) -> None:
|
|
|
|
|
"""Shortcut for registering a dynamically-imported Protobuf workflow."""
|
|
|
|
|
if namespace is not None:
|
|
|
|
|
register(
|
|
|
|
|
mtype,
|
|
|
|
|
protobuf_workflow,
|
|
|
|
|
keychain_workflow,
|
|
|
|
|
namespace,
|
|
|
|
|
import_workflow,
|
|
|
|
|
pkgname,
|
|
|
|
|
modname,
|
|
|
|
|
)
|
|
|
|
|
else:
|
|
|
|
|
register(mtype, protobuf_workflow, import_workflow, pkgname, modname)
|
|
|
|
|
workflow_namespaces[wire_type] = namespace
|
|
|
|
|
workflow_packages[wire_type] = (pkgname, modname)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def register(mtype: int, handler: Handler, *args: Any) -> None:
|
|
|
|
|
"""Register `handler` to get scheduled after `mtype` message is received."""
|
|
|
|
|
if isinstance(mtype, type) and issubclass(mtype, protobuf.MessageType):
|
|
|
|
|
mtype = mtype.MESSAGE_WIRE_TYPE
|
|
|
|
|
if mtype in workflow_handlers:
|
|
|
|
|
raise KeyError
|
|
|
|
|
workflow_handlers[mtype] = (handler, args)
|
|
|
|
|
def register(wire_type: int, handler: Handler) -> None:
|
|
|
|
|
"""Register `handler` to get scheduled after `wire_type` message is received."""
|
|
|
|
|
workflow_handlers[wire_type] = handler
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def setup(iface: WireInterface) -> None:
|
|
|
|
|
"""Initialize the wire stack on passed USB interface."""
|
|
|
|
|
loop.schedule(session_handler(iface, codec_v1.SESSION_ID))
|
|
|
|
|
loop.schedule(handle_session(iface, codec_v1.SESSION_ID))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def clear() -> None:
|
|
|
|
|
"""Remove all registered handlers."""
|
|
|
|
|
workflow_handlers.clear()
|
|
|
|
|
workflow_packages.clear()
|
|
|
|
|
workflow_namespaces.clear()
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class DummyContext:
|
|
|
|
|
async def call(*argv):
|
|
|
|
|
async def call(*argv: Any) -> None:
|
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
async def read(*argv):
|
|
|
|
|
async def read(*argv: Any) -> None:
|
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
async def write(*argv):
|
|
|
|
|
async def write(*argv: Any) -> None:
|
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
|
async def wait(self, *tasks: Awaitable) -> Any:
|
|
|
|
|
return await loop.spawn(*tasks)
|
|
|
|
|
return await loop.race(*tasks)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class Context:
|
|
|
|
|
@ -83,43 +119,57 @@ class Context:
|
|
|
|
|
self.sid = sid
|
|
|
|
|
|
|
|
|
|
async def call(
|
|
|
|
|
self, msg: MessageType, exptype: Type[LoadedMessageType]
|
|
|
|
|
) -> LoadedMessageType:
|
|
|
|
|
self, msg: protobuf.MessageType, expected_type: Type[protobuf.LoadedMessageType]
|
|
|
|
|
) -> protobuf.LoadedMessageType:
|
|
|
|
|
await self.write(msg)
|
|
|
|
|
del msg
|
|
|
|
|
return await self.read(exptype)
|
|
|
|
|
return await self.read(expected_type)
|
|
|
|
|
|
|
|
|
|
async def call_any(self, msg: MessageType, *allowed_types: int) -> MessageType:
|
|
|
|
|
async def call_any(
|
|
|
|
|
self, msg: protobuf.MessageType, *expected_wire_types: int
|
|
|
|
|
) -> protobuf.MessageType:
|
|
|
|
|
await self.write(msg)
|
|
|
|
|
del msg
|
|
|
|
|
return await self.read_any(allowed_types)
|
|
|
|
|
return await self.read_any(expected_wire_types)
|
|
|
|
|
|
|
|
|
|
async def read(
|
|
|
|
|
self, exptype: Optional[Type[LoadedMessageType]]
|
|
|
|
|
) -> LoadedMessageType:
|
|
|
|
|
self, expected_type: Type[protobuf.LoadedMessageType]
|
|
|
|
|
) -> protobuf.LoadedMessageType:
|
|
|
|
|
reader = self.make_reader()
|
|
|
|
|
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.debug(
|
|
|
|
|
__name__, "%s:%x expect: %s", self.iface.iface_num(), self.sid, exptype
|
|
|
|
|
__name__,
|
|
|
|
|
"%s:%x expect: %s",
|
|
|
|
|
self.iface.iface_num(),
|
|
|
|
|
self.sid,
|
|
|
|
|
expected_type,
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
await reader.aopen() # wait for the message header
|
|
|
|
|
# Wait for the message header, contained in the first report. After
|
|
|
|
|
# we receive it, we have a message type to match on.
|
|
|
|
|
await reader.aopen()
|
|
|
|
|
|
|
|
|
|
# if we got a message with unexpected type, raise the reader via
|
|
|
|
|
# `UnexpectedMessageError` and let the session handler deal with it
|
|
|
|
|
if exptype is None or reader.type != exptype.MESSAGE_WIRE_TYPE:
|
|
|
|
|
# If we got a message with unexpected type, raise the reader via
|
|
|
|
|
# `UnexpectedMessageError` and let the session handler deal with it.
|
|
|
|
|
if reader.type != expected_type.MESSAGE_WIRE_TYPE:
|
|
|
|
|
raise UnexpectedMessageError(reader)
|
|
|
|
|
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.debug(
|
|
|
|
|
__name__, "%s:%x read: %s", self.iface.iface_num(), self.sid, exptype
|
|
|
|
|
__name__,
|
|
|
|
|
"%s:%x read: %s",
|
|
|
|
|
self.iface.iface_num(),
|
|
|
|
|
self.sid,
|
|
|
|
|
expected_type,
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
# parse the message and return it
|
|
|
|
|
return await protobuf.load_message(reader, exptype)
|
|
|
|
|
return await protobuf.load_message(reader, expected_type)
|
|
|
|
|
|
|
|
|
|
async def read_any(self, allowed_types: Iterable[int]) -> MessageType:
|
|
|
|
|
async def read_any(
|
|
|
|
|
self, expected_wire_types: Iterable[int]
|
|
|
|
|
) -> protobuf.MessageType:
|
|
|
|
|
reader = self.make_reader()
|
|
|
|
|
|
|
|
|
|
if __debug__:
|
|
|
|
|
@ -128,14 +178,16 @@ class Context:
|
|
|
|
|
"%s:%x expect: %s",
|
|
|
|
|
self.iface.iface_num(),
|
|
|
|
|
self.sid,
|
|
|
|
|
allowed_types,
|
|
|
|
|
expected_wire_types,
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
await reader.aopen() # wait for the message header
|
|
|
|
|
# Wait for the message header, contained in the first report. After
|
|
|
|
|
# we receive it, we have a message type to match on.
|
|
|
|
|
await reader.aopen()
|
|
|
|
|
|
|
|
|
|
# if we got a message with unexpected type, raise the reader via
|
|
|
|
|
# `UnexpectedMessageError` and let the session handler deal with it
|
|
|
|
|
if reader.type not in allowed_types:
|
|
|
|
|
# If we got a message with unexpected type, raise the reader via
|
|
|
|
|
# `UnexpectedMessageError` and let the session handler deal with it.
|
|
|
|
|
if reader.type not in expected_wire_types:
|
|
|
|
|
raise UnexpectedMessageError(reader)
|
|
|
|
|
|
|
|
|
|
# find the protobuf type
|
|
|
|
|
@ -172,7 +224,7 @@ class Context:
|
|
|
|
|
while servicing the wire context. If a message comes until one of the
|
|
|
|
|
tasks ends, `UnexpectedMessageError` is raised.
|
|
|
|
|
"""
|
|
|
|
|
return loop.spawn(self.read(None), *tasks)
|
|
|
|
|
return loop.race(self.read_any(()), *tasks)
|
|
|
|
|
|
|
|
|
|
def make_reader(self) -> codec_v1.Reader:
|
|
|
|
|
return codec_v1.Reader(self.iface)
|
|
|
|
|
@ -183,120 +235,198 @@ class Context:
|
|
|
|
|
|
|
|
|
|
class UnexpectedMessageError(Exception):
|
|
|
|
|
def __init__(self, reader: codec_v1.Reader) -> None:
|
|
|
|
|
super().__init__()
|
|
|
|
|
self.reader = reader
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
async def session_handler(iface: WireInterface, sid: int) -> None:
|
|
|
|
|
reader = None
|
|
|
|
|
ctx = Context(iface, sid)
|
|
|
|
|
async def handle_session(iface: WireInterface, session_id: int) -> None:
|
|
|
|
|
ctx = Context(iface, session_id)
|
|
|
|
|
next_reader = None # type: Optional[codec_v1.Reader]
|
|
|
|
|
while True:
|
|
|
|
|
try:
|
|
|
|
|
# wait for new message, if needed, and find handler
|
|
|
|
|
if not reader:
|
|
|
|
|
reader = ctx.make_reader()
|
|
|
|
|
await reader.aopen()
|
|
|
|
|
try:
|
|
|
|
|
handler, args = workflow_handlers[reader.type]
|
|
|
|
|
except KeyError:
|
|
|
|
|
handler, args = unexpected_msg, ()
|
|
|
|
|
|
|
|
|
|
m = utils.unimport_begin()
|
|
|
|
|
w = handler(ctx, reader, *args)
|
|
|
|
|
try:
|
|
|
|
|
workflow.onstart(w)
|
|
|
|
|
await w
|
|
|
|
|
finally:
|
|
|
|
|
workflow.onclose(w)
|
|
|
|
|
utils.unimport_end(m)
|
|
|
|
|
|
|
|
|
|
except UnexpectedMessageError as exc:
|
|
|
|
|
# retry with opened reader from the exception
|
|
|
|
|
reader = exc.reader
|
|
|
|
|
continue
|
|
|
|
|
except Error as exc:
|
|
|
|
|
# we log wire.Error as warning, not as exception
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.warning(__name__, "failure: %s", exc.message)
|
|
|
|
|
except Exception as exc:
|
|
|
|
|
# sessions are never closed by raised exceptions
|
|
|
|
|
if next_reader is None:
|
|
|
|
|
# We are not currently reading a message, so let's wait for one.
|
|
|
|
|
# If the decoding fails, exception is raised and we try again
|
|
|
|
|
# (with the same `Reader` instance, it's OK). Even in case of
|
|
|
|
|
# de-synchronized wire communication, report with a message
|
|
|
|
|
# header is eventually received, after a couple of tries.
|
|
|
|
|
req_reader = ctx.make_reader()
|
|
|
|
|
await req_reader.aopen()
|
|
|
|
|
else:
|
|
|
|
|
# We have a reader left over from earlier. We should process
|
|
|
|
|
# this message instead of waiting for new one.
|
|
|
|
|
req_reader = next_reader
|
|
|
|
|
next_reader = None
|
|
|
|
|
|
|
|
|
|
# Now we are in a middle of reading a message and we need to decide
|
|
|
|
|
# what to do with it, based on its type from the message header.
|
|
|
|
|
# From this point on, we should take care to read it in full and
|
|
|
|
|
# send a response.
|
|
|
|
|
|
|
|
|
|
# Take a mark of modules that are imported at this point, so we can
|
|
|
|
|
# roll back and un-import any others. Should not raise.
|
|
|
|
|
modules = utils.unimport_begin()
|
|
|
|
|
|
|
|
|
|
# We need to find a handler for this message type. Should not
|
|
|
|
|
# raise.
|
|
|
|
|
handler = get_workflow_handler(req_reader)
|
|
|
|
|
|
|
|
|
|
if handler is None:
|
|
|
|
|
# If no handler is found, we can skip decoding and directly
|
|
|
|
|
# respond with failure, but first, we should read the rest of
|
|
|
|
|
# the message reports. Should not raise.
|
|
|
|
|
await read_and_throw_away(req_reader)
|
|
|
|
|
res_msg = unexpected_message()
|
|
|
|
|
|
|
|
|
|
else:
|
|
|
|
|
# We found a valid handler for this message type.
|
|
|
|
|
|
|
|
|
|
# Workflow task, declared for the `workflow.on_close` call later.
|
|
|
|
|
wf_task = None # type: Optional[loop.Task]
|
|
|
|
|
|
|
|
|
|
# Here we make sure we always respond with a Failure response
|
|
|
|
|
# in case of any errors.
|
|
|
|
|
try:
|
|
|
|
|
# Find a protobuf.MessageType subclass that describes this
|
|
|
|
|
# message. Raises if the type is not found.
|
|
|
|
|
req_type = messages.get_type(req_reader.type)
|
|
|
|
|
|
|
|
|
|
# Try to decode the message according to schema from
|
|
|
|
|
# `req_type`. Raises if the message is malformed.
|
|
|
|
|
req_msg = await protobuf.load_message(req_reader, req_type)
|
|
|
|
|
|
|
|
|
|
# At this point, message reports are all processed and
|
|
|
|
|
# correctly parsed into `req_msg`.
|
|
|
|
|
|
|
|
|
|
# Create the workflow task.
|
|
|
|
|
wf_task = handler(ctx, req_msg)
|
|
|
|
|
|
|
|
|
|
# Register the task into the workflow management system.
|
|
|
|
|
workflow.on_start(wf_task)
|
|
|
|
|
|
|
|
|
|
# Run the workflow task. Workflow can do more on-the-wire
|
|
|
|
|
# communication inside, but it should eventually return a
|
|
|
|
|
# response message, or raise an exception (a rather common
|
|
|
|
|
# thing to do). Exceptions are handled in the code below.
|
|
|
|
|
res_msg = await wf_task
|
|
|
|
|
|
|
|
|
|
except UnexpectedMessageError as exc:
|
|
|
|
|
# Workflow was trying to read a message from the wire, and
|
|
|
|
|
# something unexpected came in. See Context.read() for
|
|
|
|
|
# example, which expects some particular message and raises
|
|
|
|
|
# UnexpectedMessageError if another one comes in.
|
|
|
|
|
# In order not to lose the message, we pass on the reader
|
|
|
|
|
# to get picked up by the workflow logic in the beginning of
|
|
|
|
|
# the cycle, which processes it in the usual manner.
|
|
|
|
|
# TODO:
|
|
|
|
|
# We might handle only the few common cases here, like
|
|
|
|
|
# Initialize and Cancel.
|
|
|
|
|
next_reader = exc.reader
|
|
|
|
|
res_msg = None
|
|
|
|
|
|
|
|
|
|
except Exception as exc:
|
|
|
|
|
# Either:
|
|
|
|
|
# - the first workflow message had a type that has a
|
|
|
|
|
# registered handler, but does not have a protobuf class
|
|
|
|
|
# - the first workflow message was not a valid protobuf
|
|
|
|
|
# - workflow raised some kind of an exception while running
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.exception(__name__, exc)
|
|
|
|
|
res_msg = failure(exc)
|
|
|
|
|
|
|
|
|
|
finally:
|
|
|
|
|
# De-register the task from the workflow system, if we
|
|
|
|
|
# registered it before.
|
|
|
|
|
if wf_task is not None:
|
|
|
|
|
workflow.on_close(wf_task)
|
|
|
|
|
|
|
|
|
|
if res_msg is not None:
|
|
|
|
|
# Either the workflow returned a response, or we created one.
|
|
|
|
|
# Write it on the wire. Possibly, the incoming message haven't
|
|
|
|
|
# been read in full. We ignore this case here and let the rest
|
|
|
|
|
# of the reports get processed while waiting for the message
|
|
|
|
|
# header.
|
|
|
|
|
# TODO: if the write fails, we do not unimport the loaded modules
|
|
|
|
|
await ctx.write(res_msg)
|
|
|
|
|
|
|
|
|
|
# Cleanup, so garbage collection triggered after un-importing can
|
|
|
|
|
# pick up the trash.
|
|
|
|
|
req_reader = None
|
|
|
|
|
req_type = None
|
|
|
|
|
req_msg = None
|
|
|
|
|
res_msg = None
|
|
|
|
|
handler = None
|
|
|
|
|
wf_task = None
|
|
|
|
|
|
|
|
|
|
# Unload modules imported by the workflow. Should not raise.
|
|
|
|
|
utils.unimport_end(modules)
|
|
|
|
|
|
|
|
|
|
except BaseException as exc:
|
|
|
|
|
# The session handling should never exit, just log and continue.
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.exception(__name__, exc)
|
|
|
|
|
|
|
|
|
|
# read new message in next iteration
|
|
|
|
|
reader = None
|
|
|
|
|
|
|
|
|
|
def get_workflow_handler(reader: codec_v1.Reader) -> Optional[Handler]:
|
|
|
|
|
msg_type = reader.type
|
|
|
|
|
|
|
|
|
|
async def protobuf_workflow(
|
|
|
|
|
ctx: Context, reader: codec_v1.Reader, handler: Handler, *args: Any
|
|
|
|
|
) -> None:
|
|
|
|
|
from trezor.messages.Failure import Failure
|
|
|
|
|
if msg_type in workflow_handlers:
|
|
|
|
|
# Message has a handler available, return it directly.
|
|
|
|
|
handler = workflow_handlers[msg_type]
|
|
|
|
|
|
|
|
|
|
req = await protobuf.load_message(reader, messages.get_type(reader.type))
|
|
|
|
|
elif msg_type in workflow_packages:
|
|
|
|
|
# Message needs a dynamically imported handler, import it.
|
|
|
|
|
pkgname, modname = workflow_packages[msg_type]
|
|
|
|
|
handler = import_workflow(pkgname, modname)
|
|
|
|
|
|
|
|
|
|
if __debug__:
|
|
|
|
|
log.debug(__name__, "%s:%x request: %s", ctx.iface.iface_num(), ctx.sid, req)
|
|
|
|
|
else:
|
|
|
|
|
# Message does not have any registered handler.
|
|
|
|
|
return None
|
|
|
|
|
|
|
|
|
|
try:
|
|
|
|
|
res = await handler(ctx, req, *args)
|
|
|
|
|
except UnexpectedMessageError:
|
|
|
|
|
# session handler takes care of this one
|
|
|
|
|
raise
|
|
|
|
|
except Error as exc:
|
|
|
|
|
# respond with specific code and message
|
|
|
|
|
await ctx.write(Failure(code=exc.code, message=exc.message))
|
|
|
|
|
raise
|
|
|
|
|
except Exception as e:
|
|
|
|
|
# respond with a generic code and message
|
|
|
|
|
message = "Firmware error"
|
|
|
|
|
if __debug__:
|
|
|
|
|
message = "{}: {}".format(type(e), e)
|
|
|
|
|
await ctx.write(Failure(code=FailureType.FirmwareError, message=message))
|
|
|
|
|
raise
|
|
|
|
|
if res:
|
|
|
|
|
# respond with a specific response
|
|
|
|
|
await ctx.write(res)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
async def keychain_workflow(
|
|
|
|
|
ctx: Context,
|
|
|
|
|
req: protobuf.MessageType,
|
|
|
|
|
namespace: List,
|
|
|
|
|
handler: Handler,
|
|
|
|
|
*args: Any
|
|
|
|
|
) -> Any:
|
|
|
|
|
from apps.common import seed
|
|
|
|
|
|
|
|
|
|
keychain = await seed.get_keychain(ctx, namespace)
|
|
|
|
|
args += (keychain,)
|
|
|
|
|
try:
|
|
|
|
|
return await handler(ctx, req, *args)
|
|
|
|
|
finally:
|
|
|
|
|
keychain.__del__()
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def import_workflow(
|
|
|
|
|
ctx: Context, req: protobuf.MessageType, pkgname: str, modname: str, *args: Any
|
|
|
|
|
) -> Any:
|
|
|
|
|
if msg_type in workflow_namespaces:
|
|
|
|
|
# Workflow needs a keychain, wrap it with a keychain provider.
|
|
|
|
|
namespace = workflow_namespaces[msg_type]
|
|
|
|
|
handler = wrap_keychain_workflow(handler, namespace)
|
|
|
|
|
|
|
|
|
|
return handler
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def import_workflow(pkgname: str, modname: str) -> Handler:
|
|
|
|
|
modpath = "%s.%s" % (pkgname, modname)
|
|
|
|
|
module = __import__(modpath, None, None, (modname,), 0) # type: ignore
|
|
|
|
|
handler = getattr(module, modname)
|
|
|
|
|
return handler(ctx, req, *args)
|
|
|
|
|
return handler
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
async def unexpected_msg(ctx: Context, reader: codec_v1.Reader) -> None:
|
|
|
|
|
from trezor.messages.Failure import Failure
|
|
|
|
|
def wrap_keychain_workflow(handler: Handler, namespace: List) -> Handler:
|
|
|
|
|
async def keychain_workflow(ctx: Context, req: protobuf.MessageType) -> Any:
|
|
|
|
|
from apps.common import seed
|
|
|
|
|
|
|
|
|
|
# receive the message and throw it away
|
|
|
|
|
await read_full_msg(reader)
|
|
|
|
|
# Workflow that is hiding behind `handler` expects a keychain
|
|
|
|
|
# instance, in addition to the request message. Acquire it from
|
|
|
|
|
# the seed module. More on-the-wire communication, and also UI
|
|
|
|
|
# interaction, might happen here.
|
|
|
|
|
keychain = await seed.get_keychain(ctx, namespace)
|
|
|
|
|
try:
|
|
|
|
|
return await handler(ctx, req, keychain)
|
|
|
|
|
finally:
|
|
|
|
|
# Be hygienic and wipe the keys from memory.
|
|
|
|
|
keychain.__del__()
|
|
|
|
|
|
|
|
|
|
# respond with an unknown message error
|
|
|
|
|
await ctx.write(
|
|
|
|
|
Failure(code=FailureType.UnexpectedMessage, message="Unexpected message")
|
|
|
|
|
)
|
|
|
|
|
return keychain_workflow
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def failure(exc: BaseException) -> Failure:
|
|
|
|
|
if isinstance(exc, Error):
|
|
|
|
|
return Failure(code=exc.code, message=exc.message)
|
|
|
|
|
else:
|
|
|
|
|
return Failure(code=FailureType.FirmwareError, message="Firmware error")
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def unexpected_message() -> Failure:
|
|
|
|
|
return Failure(code=FailureType.UnexpectedMessage, message="Unexpected message")
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
async def read_full_msg(reader: codec_v1.Reader) -> None:
|
|
|
|
|
async def read_and_throw_away(reader: codec_v1.Reader) -> None:
|
|
|
|
|
while reader.size > 0:
|
|
|
|
|
buf = bytearray(reader.size)
|
|
|
|
|
await reader.areadinto(buf)
|
|
|
|
|
|
Jan Pochyla
5 years ago
committed by