611 lines
19 KiB
Python
611 lines
19 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains exceptions and error codes."""
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import logging
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import typing
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from http import HTTPStatus
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from typing import Dict, List, Optional, Union
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from twisted.web import http
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from synapse.util import json_decoder
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if typing.TYPE_CHECKING:
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from synapse.types import JsonDict
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logger = logging.getLogger(__name__)
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class Codes:
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UNRECOGNIZED = "M_UNRECOGNIZED"
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UNAUTHORIZED = "M_UNAUTHORIZED"
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FORBIDDEN = "M_FORBIDDEN"
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BAD_JSON = "M_BAD_JSON"
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NOT_JSON = "M_NOT_JSON"
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USER_IN_USE = "M_USER_IN_USE"
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ROOM_IN_USE = "M_ROOM_IN_USE"
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BAD_PAGINATION = "M_BAD_PAGINATION"
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BAD_STATE = "M_BAD_STATE"
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UNKNOWN = "M_UNKNOWN"
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NOT_FOUND = "M_NOT_FOUND"
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MISSING_TOKEN = "M_MISSING_TOKEN"
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UNKNOWN_TOKEN = "M_UNKNOWN_TOKEN"
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GUEST_ACCESS_FORBIDDEN = "M_GUEST_ACCESS_FORBIDDEN"
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LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
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CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
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CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
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MISSING_PARAM = "M_MISSING_PARAM"
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INVALID_PARAM = "M_INVALID_PARAM"
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TOO_LARGE = "M_TOO_LARGE"
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EXCLUSIVE = "M_EXCLUSIVE"
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THREEPID_AUTH_FAILED = "M_THREEPID_AUTH_FAILED"
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THREEPID_IN_USE = "M_THREEPID_IN_USE"
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THREEPID_NOT_FOUND = "M_THREEPID_NOT_FOUND"
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THREEPID_DENIED = "M_THREEPID_DENIED"
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INVALID_USERNAME = "M_INVALID_USERNAME"
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SERVER_NOT_TRUSTED = "M_SERVER_NOT_TRUSTED"
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CONSENT_NOT_GIVEN = "M_CONSENT_NOT_GIVEN"
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CANNOT_LEAVE_SERVER_NOTICE_ROOM = "M_CANNOT_LEAVE_SERVER_NOTICE_ROOM"
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RESOURCE_LIMIT_EXCEEDED = "M_RESOURCE_LIMIT_EXCEEDED"
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UNSUPPORTED_ROOM_VERSION = "M_UNSUPPORTED_ROOM_VERSION"
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INCOMPATIBLE_ROOM_VERSION = "M_INCOMPATIBLE_ROOM_VERSION"
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WRONG_ROOM_KEYS_VERSION = "M_WRONG_ROOM_KEYS_VERSION"
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EXPIRED_ACCOUNT = "ORG_MATRIX_EXPIRED_ACCOUNT"
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PASSWORD_TOO_SHORT = "M_PASSWORD_TOO_SHORT"
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PASSWORD_NO_DIGIT = "M_PASSWORD_NO_DIGIT"
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PASSWORD_NO_UPPERCASE = "M_PASSWORD_NO_UPPERCASE"
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PASSWORD_NO_LOWERCASE = "M_PASSWORD_NO_LOWERCASE"
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PASSWORD_NO_SYMBOL = "M_PASSWORD_NO_SYMBOL"
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PASSWORD_IN_DICTIONARY = "M_PASSWORD_IN_DICTIONARY"
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WEAK_PASSWORD = "M_WEAK_PASSWORD"
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INVALID_SIGNATURE = "M_INVALID_SIGNATURE"
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USER_DEACTIVATED = "M_USER_DEACTIVATED"
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BAD_ALIAS = "M_BAD_ALIAS"
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class CodeMessageException(RuntimeError):
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"""An exception with integer code and message string attributes.
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Attributes:
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code: HTTP error code
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msg: string describing the error
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"""
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def __init__(self, code: Union[int, HTTPStatus], msg: str):
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super().__init__("%d: %s" % (code, msg))
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# Some calls to this method pass instances of http.HTTPStatus for `code`.
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# While HTTPStatus is a subclass of int, it has magic __str__ methods
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# which emit `HTTPStatus.FORBIDDEN` when converted to a str, instead of `403`.
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# This causes inconsistency in our log lines.
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#
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# To eliminate this behaviour, we convert them to their integer equivalents here.
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self.code = int(code)
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self.msg = msg
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class RedirectException(CodeMessageException):
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"""A pseudo-error indicating that we want to redirect the client to a different
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location
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Attributes:
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cookies: a list of set-cookies values to add to the response. For example:
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b"sessionId=a3fWa; Expires=Wed, 21 Oct 2015 07:28:00 GMT"
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"""
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def __init__(self, location: bytes, http_code: int = http.FOUND):
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"""
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Args:
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location: the URI to redirect to
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http_code: the HTTP response code
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"""
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msg = "Redirect to %s" % (location.decode("utf-8"),)
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super().__init__(code=http_code, msg=msg)
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self.location = location
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self.cookies = [] # type: List[bytes]
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class SynapseError(CodeMessageException):
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"""A base exception type for matrix errors which have an errcode and error
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message (as well as an HTTP status code).
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Attributes:
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errcode: Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(self, code: int, msg: str, errcode: str = Codes.UNKNOWN):
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"""Constructs a synapse error.
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Args:
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code: The integer error code (an HTTP response code)
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msg: The human-readable error message.
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errcode: The matrix error code e.g 'M_FORBIDDEN'
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"""
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super().__init__(code, msg)
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self.errcode = errcode
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def error_dict(self):
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return cs_error(self.msg, self.errcode)
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class ProxiedRequestError(SynapseError):
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"""An error from a general matrix endpoint, eg. from a proxied Matrix API call.
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Attributes:
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errcode: Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(
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self,
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code: int,
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msg: str,
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errcode: str = Codes.UNKNOWN,
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additional_fields: Optional[Dict] = None,
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):
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super().__init__(code, msg, errcode)
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if additional_fields is None:
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self._additional_fields = {} # type: Dict
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else:
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self._additional_fields = dict(additional_fields)
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def error_dict(self):
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return cs_error(self.msg, self.errcode, **self._additional_fields)
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class ConsentNotGivenError(SynapseError):
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"""The error returned to the client when the user has not consented to the
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privacy policy.
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"""
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def __init__(self, msg: str, consent_uri: str):
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"""Constructs a ConsentNotGivenError
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Args:
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msg: The human-readable error message
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consent_url: The URL where the user can give their consent
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"""
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super().__init__(
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code=HTTPStatus.FORBIDDEN, msg=msg, errcode=Codes.CONSENT_NOT_GIVEN
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)
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self._consent_uri = consent_uri
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def error_dict(self):
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return cs_error(self.msg, self.errcode, consent_uri=self._consent_uri)
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class UserDeactivatedError(SynapseError):
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"""The error returned to the client when the user attempted to access an
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authenticated endpoint, but the account has been deactivated.
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"""
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def __init__(self, msg: str):
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"""Constructs a UserDeactivatedError
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Args:
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msg: The human-readable error message
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"""
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super().__init__(
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code=HTTPStatus.FORBIDDEN, msg=msg, errcode=Codes.USER_DEACTIVATED
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)
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class FederationDeniedError(SynapseError):
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"""An error raised when the server tries to federate with a server which
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is not on its federation whitelist.
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Attributes:
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destination: The destination which has been denied
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"""
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def __init__(self, destination: Optional[str]):
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"""Raised by federation client or server to indicate that we are
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are deliberately not attempting to contact a given server because it is
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not on our federation whitelist.
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Args:
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destination: the domain in question
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"""
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self.destination = destination
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super().__init__(
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code=403,
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msg="Federation denied with %s." % (self.destination,),
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errcode=Codes.FORBIDDEN,
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)
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class InteractiveAuthIncompleteError(Exception):
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"""An error raised when UI auth is not yet complete
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(This indicates we should return a 401 with 'result' as the body)
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Attributes:
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session_id: The ID of the ongoing interactive auth session.
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result: the server response to the request, which should be
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passed back to the client
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"""
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def __init__(self, session_id: str, result: "JsonDict"):
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super().__init__("Interactive auth not yet complete")
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self.session_id = session_id
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self.result = result
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class UnrecognizedRequestError(SynapseError):
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"""An error indicating we don't understand the request you're trying to make"""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.UNRECOGNIZED
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if len(args) == 0:
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message = "Unrecognized request"
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else:
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message = args[0]
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super().__init__(400, message, **kwargs)
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class NotFoundError(SynapseError):
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"""An error indicating we can't find the thing you asked for"""
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def __init__(self, msg: str = "Not found", errcode: str = Codes.NOT_FOUND):
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super().__init__(404, msg, errcode=errcode)
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class AuthError(SynapseError):
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"""An error raised when there was a problem authorising an event, and at various
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other poorly-defined times.
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"""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.FORBIDDEN
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super().__init__(*args, **kwargs)
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class InvalidClientCredentialsError(SynapseError):
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"""An error raised when there was a problem with the authorisation credentials
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in a client request.
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https://matrix.org/docs/spec/client_server/r0.5.0#using-access-tokens:
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When credentials are required but missing or invalid, the HTTP call will
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return with a status of 401 and the error code, M_MISSING_TOKEN or
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M_UNKNOWN_TOKEN respectively.
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"""
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def __init__(self, msg: str, errcode: str):
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super().__init__(code=401, msg=msg, errcode=errcode)
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class MissingClientTokenError(InvalidClientCredentialsError):
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"""Raised when we couldn't find the access token in a request"""
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def __init__(self, msg: str = "Missing access token"):
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super().__init__(msg=msg, errcode="M_MISSING_TOKEN")
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class InvalidClientTokenError(InvalidClientCredentialsError):
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"""Raised when we didn't understand the access token in a request"""
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def __init__(
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self, msg: str = "Unrecognised access token", soft_logout: bool = False
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):
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super().__init__(msg=msg, errcode="M_UNKNOWN_TOKEN")
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self._soft_logout = soft_logout
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def error_dict(self):
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d = super().error_dict()
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d["soft_logout"] = self._soft_logout
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return d
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class ResourceLimitError(SynapseError):
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"""
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Any error raised when there is a problem with resource usage.
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For instance, the monthly active user limit for the server has been exceeded
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"""
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def __init__(
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self,
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code: int,
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msg: str,
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errcode: str = Codes.RESOURCE_LIMIT_EXCEEDED,
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admin_contact: Optional[str] = None,
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limit_type: Optional[str] = None,
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):
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self.admin_contact = admin_contact
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self.limit_type = limit_type
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super().__init__(code, msg, errcode=errcode)
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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admin_contact=self.admin_contact,
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limit_type=self.limit_type,
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)
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class EventSizeError(SynapseError):
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"""An error raised when an event is too big."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.TOO_LARGE
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super().__init__(413, *args, **kwargs)
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class EventStreamError(SynapseError):
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"""An error raised when there a problem with the event stream."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.BAD_PAGINATION
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super().__init__(*args, **kwargs)
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class LoginError(SynapseError):
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"""An error raised when there was a problem logging in."""
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pass
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class StoreError(SynapseError):
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"""An error raised when there was a problem storing some data."""
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pass
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class InvalidCaptchaError(SynapseError):
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def __init__(
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self,
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code: int = 400,
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msg: str = "Invalid captcha.",
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error_url: Optional[str] = None,
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errcode: str = Codes.CAPTCHA_INVALID,
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):
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super().__init__(code, msg, errcode)
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self.error_url = error_url
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def error_dict(self):
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return cs_error(self.msg, self.errcode, error_url=self.error_url)
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class LimitExceededError(SynapseError):
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"""A client has sent too many requests and is being throttled."""
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def __init__(
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self,
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code: int = 429,
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msg: str = "Too Many Requests",
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retry_after_ms: Optional[int] = None,
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errcode: str = Codes.LIMIT_EXCEEDED,
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):
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super().__init__(code, msg, errcode)
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self.retry_after_ms = retry_after_ms
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def error_dict(self):
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return cs_error(self.msg, self.errcode, retry_after_ms=self.retry_after_ms)
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class RoomKeysVersionError(SynapseError):
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"""A client has tried to upload to a non-current version of the room_keys store"""
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def __init__(self, current_version: str):
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"""
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Args:
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current_version: the current version of the store they should have used
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"""
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super().__init__(403, "Wrong room_keys version", Codes.WRONG_ROOM_KEYS_VERSION)
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self.current_version = current_version
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class UnsupportedRoomVersionError(SynapseError):
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"""The client's request to create a room used a room version that the server does
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not support."""
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def __init__(self, msg: str = "Homeserver does not support this room version"):
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super().__init__(
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code=400,
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msg=msg,
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errcode=Codes.UNSUPPORTED_ROOM_VERSION,
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)
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class ThreepidValidationError(SynapseError):
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"""An error raised when there was a problem authorising an event."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.FORBIDDEN
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super().__init__(*args, **kwargs)
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class IncompatibleRoomVersionError(SynapseError):
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"""A server is trying to join a room whose version it does not support.
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Unlike UnsupportedRoomVersionError, it is specific to the case of the make_join
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failing.
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"""
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def __init__(self, room_version: str):
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super().__init__(
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code=400,
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msg="Your homeserver does not support the features required to "
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"join this room",
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errcode=Codes.INCOMPATIBLE_ROOM_VERSION,
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)
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self._room_version = room_version
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def error_dict(self):
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return cs_error(self.msg, self.errcode, room_version=self._room_version)
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class PasswordRefusedError(SynapseError):
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"""A password has been refused, either during password reset/change or registration."""
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def __init__(
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self,
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msg: str = "This password doesn't comply with the server's policy",
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errcode: str = Codes.WEAK_PASSWORD,
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):
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super().__init__(
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code=400,
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msg=msg,
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errcode=errcode,
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)
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class RequestSendFailed(RuntimeError):
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"""Sending a HTTP request over federation failed due to not being able to
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talk to the remote server for some reason.
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This exception is used to differentiate "expected" errors that arise due to
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networking (e.g. DNS failures, connection timeouts etc), versus unexpected
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errors (like programming errors).
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"""
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def __init__(self, inner_exception, can_retry):
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super().__init__(
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"Failed to send request: %s: %s"
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% (type(inner_exception).__name__, inner_exception)
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)
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self.inner_exception = inner_exception
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self.can_retry = can_retry
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def cs_error(msg: str, code: str = Codes.UNKNOWN, **kwargs):
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"""Utility method for constructing an error response for client-server
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interactions.
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Args:
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msg: The error message.
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code: The error code.
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kwargs: Additional keys to add to the response.
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Returns:
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A dict representing the error response JSON.
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"""
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err = {"error": msg, "errcode": code}
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for key, value in kwargs.items():
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err[key] = value
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return err
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class FederationError(RuntimeError):
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"""This class is used to inform remote homeservers about erroneous
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PDUs they sent us.
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FATAL: The remote server could not interpret the source event.
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(e.g., it was missing a required field)
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ERROR: The remote server interpreted the event, but it failed some other
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check (e.g. auth)
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WARN: The remote server accepted the event, but believes some part of it
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is wrong (e.g., it referred to an invalid event)
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"""
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def __init__(
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self,
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level: str,
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code: int,
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reason: str,
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affected: str,
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source: Optional[str] = None,
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):
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if level not in ["FATAL", "ERROR", "WARN"]:
|
|
raise ValueError("Level is not valid: %s" % (level,))
|
|
self.level = level
|
|
self.code = code
|
|
self.reason = reason
|
|
self.affected = affected
|
|
self.source = source
|
|
|
|
msg = "%s %s: %s" % (level, code, reason)
|
|
super().__init__(msg)
|
|
|
|
def get_dict(self):
|
|
return {
|
|
"level": self.level,
|
|
"code": self.code,
|
|
"reason": self.reason,
|
|
"affected": self.affected,
|
|
"source": self.source if self.source else self.affected,
|
|
}
|
|
|
|
|
|
class HttpResponseException(CodeMessageException):
|
|
"""
|
|
Represents an HTTP-level failure of an outbound request
|
|
|
|
Attributes:
|
|
response: body of response
|
|
"""
|
|
|
|
def __init__(self, code: int, msg: str, response: bytes):
|
|
"""
|
|
|
|
Args:
|
|
code: HTTP status code
|
|
msg: reason phrase from HTTP response status line
|
|
response: body of response
|
|
"""
|
|
super().__init__(code, msg)
|
|
self.response = response
|
|
|
|
def to_synapse_error(self):
|
|
"""Make a SynapseError based on an HTTPResponseException
|
|
|
|
This is useful when a proxied request has failed, and we need to
|
|
decide how to map the failure onto a matrix error to send back to the
|
|
client.
|
|
|
|
An attempt is made to parse the body of the http response as a matrix
|
|
error. If that succeeds, the errcode and error message from the body
|
|
are used as the errcode and error message in the new synapse error.
|
|
|
|
Otherwise, the errcode is set to M_UNKNOWN, and the error message is
|
|
set to the reason code from the HTTP response.
|
|
|
|
Returns:
|
|
SynapseError:
|
|
"""
|
|
# try to parse the body as json, to get better errcode/msg, but
|
|
# default to M_UNKNOWN with the HTTP status as the error text
|
|
try:
|
|
j = json_decoder.decode(self.response.decode("utf-8"))
|
|
except ValueError:
|
|
j = {}
|
|
|
|
if not isinstance(j, dict):
|
|
j = {}
|
|
|
|
errcode = j.pop("errcode", Codes.UNKNOWN)
|
|
errmsg = j.pop("error", self.msg)
|
|
|
|
return ProxiedRequestError(self.code, errmsg, errcode, j)
|
|
|
|
|
|
class ShadowBanError(Exception):
|
|
"""
|
|
Raised when a shadow-banned user attempts to perform an action.
|
|
|
|
This should be caught and a proper "fake" success response sent to the user.
|
|
"""
|