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SecretStorage module for Python # Access passwords using the SecretService DBus API # Author: Dmitry Shachnev, 2013 # License: BSD """This module provides some utility functions, but these shouldn't normally be used by external applications.""" import dbus import os from secretstorage.defines import DBUS_UNKNOWN_METHOD, DBUS_NO_SUCH_OBJECT, \ DBUS_SERVICE_UNKNOWN, DBUS_NO_REPLY, DBUS_NOT_SUPPORTED, DBUS_EXEC_FAILED, \ SS_PATH, SS_PREFIX, ALGORITHM_DH, ALGORITHM_PLAIN from secretstorage.dhcrypto import Session, int_to_bytes from secretstorage.exceptions import ItemNotFoundException, \ SecretServiceNotAvailableException from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes from cryptography.hazmat.backends import default_backend from cryptography.utils import int_from_bytes BUS_NAME = 'org.freedesktop.secrets' SERVICE_IFACE = SS_PREFIX + 'Service' class InterfaceWrapper(dbus.Interface): """Wraps :cls:`dbus.Interface` class and replaces some D-Bus exceptions with :doc:`SecretStorage exceptions `.""" def catch_errors(self, function_in): def function_out(*args, **kwargs): try: return function_in(*args, **kwargs) except dbus.exceptions.DBusException as e: if e.get_dbus_name() == DBUS_UNKNOWN_METHOD: raise ItemNotFoundException('Item does not exist!') if e.get_dbus_name() == DBUS_NO_SUCH_OBJECT: raise ItemNotFoundException(e.get_dbus_message()) if e.get_dbus_name() in (DBUS_NO_REPLY, DBUS_NOT_SUPPORTED): raise SecretServiceNotAvailableException( e.get_dbus_message()) raise return function_out def __getattr__(self, attribute): result = dbus.Interface.__getattr__(self, attribute) if callable(result): result = self.catch_errors(result) return result def bus_get_object(bus, object_path, service_name=None): """A wrapper around :meth:`SessionBus.get_object` that raises :exc:`~secretstorage.exceptions.SecretServiceNotAvailableException` when appropriate.""" name = service_name or BUS_NAME try: return bus.get_object(name, object_path, introspect=False) except dbus.exceptions.DBusException as e: if e.get_dbus_name() in (DBUS_SERVICE_UNKNOWN, DBUS_EXEC_FAILED, DBUS_NO_REPLY): raise SecretServiceNotAvailableException(e.get_dbus_message()) raise def open_session(bus): """Returns a new Secret Service session.""" service_obj = bus_get_object(bus, SS_PATH) service_iface = dbus.Interface(service_obj, SS_PREFIX+'Service') session = Session() try: output, result = service_iface.OpenSession( ALGORITHM_DH, dbus.ByteArray(int_to_bytes(session.my_public_key)), signature='sv' ) except dbus.exceptions.DBusException as e: if e.get_dbus_name() != DBUS_NOT_SUPPORTED: raise output, result = service_iface.OpenSession( ALGORITHM_PLAIN, '', signature='sv' ) session.encrypted = False else: output = int_from_bytes(bytearray(output), 'big') session.set_server_public_key(output) session.object_path = result return session def format_secret(session, secret, content_type): """Formats `secret` to make possible to pass it to the Secret Service API.""" if not isinstance(secret, bytes): secret = secret.encode('utf-8') if not session.encrypted: return dbus.Struct((session.object_path, '', dbus.ByteArray(secret), content_type)) # PKCS-7 style padding padding = 0x10 - (len(secret) & 0xf) secret += bytes(bytearray((padding,)) * padding) aes_iv = os.urandom(0x10) aes = algorithms.AES(session.aes_key) encryptor = Cipher(aes, modes.CBC(aes_iv), default_backend()).encryptor() encrypted_secret = encryptor.update(secret) + encryptor.finalize() return dbus.Struct(( session.object_path, dbus.Array(aes_iv), dbus.Array(bytearray(encrypted_secret)), content_type )) def exec_prompt(bus, prompt, callback): """Executes the given `prompt`, when complete calls `callback` function with two arguments: a boolean representing whether the operation was dismissed and a list of unlocked item paths. A main loop should be running and registered for this function to work.""" prompt_obj = bus_get_object(bus, prompt) prompt_iface = dbus.Interface(prompt_obj, SS_PREFIX+'Prompt') prompt_iface.Prompt('', signature='s') def new_callback(dismissed, unlocked): if isinstance(unlocked, dbus.Array): unlocked = list(unlocked) callback(bool(dismissed), unlocked) prompt_iface.connect_to_signal('Completed', new_callback) def exec_prompt_glib(bus, prompt): """Like :func:`exec_prompt`, but synchronous (uses loop from GLib API). Returns (*dismissed*, *unlocked*) tuple.""" from gi.repository import GLib loop = GLib.MainLoop() result = [] def callback(dismissed, unlocked): result.append(dismissed) result.append(unlocked) loop.quit() exec_prompt(bus, prompt, callback) loop.run() return result[0], result[1] def exec_prompt_qt(bus, prompt): """Like :func:`exec_prompt`, but synchronous (uses loop from PyQt5 API). Returns (*dismissed*, *unlocked*) tuple.""" from PyQt5.QtCore import QCoreApplication app = QCoreApplication([]) result = [] def callback(dismissed, unlocked): result.append(dismissed) result.append(unlocked) app.quit() exec_prompt(bus, prompt, callback) app.exec_() return result[0], result[1] def unlock_objects(bus, paths, callback=None): """Requests unlocking objects specified in `paths`. If `callback` is specified, calls it when unlocking is complete (see :func:`exec_prompt` description for details). Otherwise, uses the loop from GLib API and returns a boolean representing whether the operation was dismissed. .. versionadded:: 2.1.2""" service_obj = bus_get_object(bus, SS_PATH) service_iface = InterfaceWrapper(service_obj, SERVICE_IFACE) unlocked_paths, prompt = service_iface.Unlock(paths, signature='ao') unlocked_paths = list(unlocked_paths) # Convert from dbus.Array if len(prompt) > 1: if callback: exec_prompt(bus, prompt, callback) else: return exec_prompt_glib(bus, prompt)[0] elif callback: # We still need to call it. callback(False, unlocked_paths) def to_unicode(string): """Converts D-Bus string to unicode string.""" try: # For Python 2 return unicode(string) except NameError: # For Python 3 return str(string)