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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Provides access to PolicyKit privilege mangement using gdefer Deferreds."""
# Copyright (C) 2008-2009 Sebastian Heinlein <devel@glatzor.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
__author__ = "Sebastian Heinlein <devel@glatzor.de>"
__all__ = ("check_authorization_by_name", "check_authorization_by_pid",
"get_pid_from_dbus_name", "get_uid_from_dbus_name",
"CHECK_AUTH_ALLOW_USER_INTERACTION", "CHECK_AUTH_NONE",
"PK_ACTION_ADD_REMOVE_VENDOR_KEY", "PK_ACTION_CANCEL_FOREIGN",
"PK_ACTION_CHANGE_REPOSITORY",
"PK_ACTION_CHANGE_CONIFG",
"PK_ACTION_GET_TRUSTED_VENDOR_KEYS",
"PK_ACTION_INSTALL_FILE",
"PK_ACTION_INSTALL_OR_REMOVE_PACKAGES",
"PK_ACTION_INSTALL_PACKAGES_FROM_NEW_REPO",
"PK_ACTION_INSTALL_PACKAGES_FROM_HIGH_TRUST_REPO",
"PK_ACTION_INSTALL_PURCHASED_PACKAGES",
"PK_ACTION_UPDATE_CACHE", "PK_ACTION_UPGRADE_PACKAGES",
"PK_ACTION_SET_PROXY", "PK_ACTION_CLEAN")
import dbus
from defer import Deferred, inline_callbacks, return_value
from .errors import NotAuthorizedError, AuthorizationFailed
PK_ACTION_INSTALL_OR_REMOVE_PACKAGES = (
"org.debian.apt.install-or-remove-packages")
PK_ACTION_INSTALL_PURCHASED_PACKAGES = (
"org.debian.apt.install-purchased-packages")
PK_ACTION_INSTALL_PACKAGES_FROM_NEW_REPO = (
"org.debian.apt.install-packages-from-new-repo")
PK_ACTION_INSTALL_PACKAGES_FROM_HIGH_TRUST_REPO = (
"org.debian.apt.install-packages.high-trust-repo")
PK_ACTION_INSTALL_FILE = "org.debian.apt.install-file"
PK_ACTION_UPGRADE_PACKAGES = "org.debian.apt.upgrade-packages"
PK_ACTION_UPDATE_CACHE = "org.debian.apt.update-cache"
PK_ACTION_CANCEL_FOREIGN = "org.debian.apt.cancel-foreign"
PK_ACTION_GET_TRUSTED_VENDOR_KEYS = "org.debian.apt.get-trusted-vendor-keys"
PK_ACTION_CHANGE_REPOSITORY = "org.debian.apt.change-repository"
PK_ACTION_CHANGE_CONFIG = "org.debian.apt.change-config"
PK_ACTION_SET_PROXY = "org.debian.apt.set-proxy"
PK_ACTION_CLEAN = "org.debian.apt.clean"
CHECK_AUTH_NONE = 0
CHECK_AUTH_ALLOW_USER_INTERACTION = 1
def check_authorization_by_name(dbus_name, action_id, timeout=86400, bus=None,
flags=None):
"""Check if the given sender is authorized for the specified action.
If the sender is not authorized raise NotAuthorizedError.
Keyword arguments:
dbus_name -- D-Bus name of the subject
action_id -- the PolicyKit policy name of the action
timeout -- time in seconds for the user to authenticate
bus -- the D-Bus connection (defaults to the system bus)
flags -- optional flags to control the authentication process
"""
subject = ("system-bus-name", {"name": dbus_name})
return _check_authorization(subject, action_id, timeout, bus, flags)
def check_authorization_by_pid(pid, action_id, timeout=86400, bus=None,
flags=None):
"""Check if the given process is authorized for the specified action.
If the sender is not authorized raise NotAuthorizedError.
Keyword arguments:
pid -- id of the process
action_id -- the PolicyKit policy name of the action
timeout -- time in seconds for the user to authenticate
bus -- the D-Bus connection (defaults to the system bus)
flags -- optional flags to control the authentication process
"""
subject = ("unix-process", {"pid": pid})
return _check_authorization(subject, action_id, timeout, bus, flags)
def _check_authorization(subject, action_id, timeout, bus, flags=None):
def policykit_done(xxx_todo_changeme):
(authorized, challenged, auth_details) = xxx_todo_changeme
if authorized:
deferred.callback(auth_details)
elif challenged:
deferred.errback(AuthorizationFailed(subject, action_id))
else:
deferred.errback(NotAuthorizedError(subject, action_id))
if not bus:
bus = dbus.SystemBus()
# Set the default flags
if flags is None:
flags = CHECK_AUTH_ALLOW_USER_INTERACTION
deferred = Deferred()
pk = bus.get_object("org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority")
details = {}
pk.CheckAuthorization(
subject, action_id, details, flags, "",
dbus_interface="org.freedesktop.PolicyKit1.Authority",
timeout=timeout,
reply_handler=policykit_done,
error_handler=deferred.errback)
return deferred
def get_pid_from_dbus_name(dbus_name, bus=None):
"""Return a deferred that gets the id of process owning the given
system D-Bus name.
"""
if not bus:
bus = dbus.SystemBus()
deferred = Deferred()
bus_obj = bus.get_object("org.freedesktop.DBus",
"/org/freedesktop/DBus/Bus")
bus_obj.GetConnectionUnixProcessID(dbus_name,
dbus_interface="org.freedesktop.DBus",
reply_handler=deferred.callback,
error_handler=deferred.errback)
return deferred
@inline_callbacks
def get_uid_from_dbus_name(dbus_name, bus=None):
"""Return a deferred that gets the uid of the user owning the given
system D-Bus name.
"""
if not bus:
bus = dbus.SystemBus()
pid = yield get_pid_from_dbus_name(dbus_name, bus)
with open("/proc/%s/status" % pid) as proc:
values = [v for v in proc.readlines() if v.startswith("Uid:")]
uid = int(values[0].split()[1])
return_value(uid)
@inline_callbacks
def get_proc_info_from_dbus_name(dbus_name, bus=None):
"""Return a deferred that gets the pid, the uid of the user owning the
given system D-Bus name and its command line.
"""
if not bus:
bus = dbus.SystemBus()
pid = yield get_pid_from_dbus_name(dbus_name, bus)
with open("/proc/%s/status" % pid) as proc:
lines = proc.readlines()
uid_values = [v for v in lines if v.startswith("Uid:")]
gid_values = [v for v in lines if v.startswith("Gid:")]
# instead of ", encoding='utf8'" we use the "rb"/decode() here for
# py2 compatibility
with open("/proc/%s/cmdline" % pid, "rb") as cmdline_file:
cmdline = cmdline_file.read().decode("utf-8")
uid = int(uid_values[0].split()[1])
gid = int(gid_values[0].split()[1])
return_value((pid, uid, gid, cmdline))
# vim:ts=4:sw=4:et
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