Source code for qrexec.exc

#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2013-2015  Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2013-2017  Marek Marczykowski-Górecki
#                                   <marmarek@invisiblethingslab.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <https://www.gnu.org/licenses/>.
#
import pathlib
from typing import Optional




class AccessDenied(Exception):
    """
    Raised when qrexec policy denied access.

    :py:attr:`notify` controls whether to notify the user about denying
    access. This defaults to true, except when specified otherwise
    (e.g. because we applied a policy that says `notify=no`).
    """

    def __init__(self, msg: str, notify: bool = True):
        super().__init__(msg)
        self.notify = notify





class PolicySyntaxError(AccessDenied):
    """Syntax error in qrexec policy, abort parsing"""

    def __init__(
        self,
        filepath: Optional[pathlib.PurePath],
        lineno: Optional[int],
        msg: str,
    ):
        super().__init__(f"{filepath or '<unknown>'}:{lineno}: {msg}")





class PolicyNotFound(AccessDenied):
    """Policy was not found for this service"""

    def __init__(self, service_name: str):
        super().__init__("Policy not found for service {}".format(service_name))





class RequestError(AccessDenied):
    """Raised if Request instantiation fails validation."""





class QubesMgmtException(Exception):
    """Exception returned by qubesd"""

    def __init__(self, exc_type: str):
        super().__init__()
        self.exc_type = exc_type