Current File : //usr/lib/python3.6/site-packages/firewall/dbus_utils.py
# -*- coding: utf-8 -*-
#
# Copyright (C) 2011-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# 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
# (at your option) 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, see <http://www.gnu.org/licenses/>.
#
__all__ = [ "command_of_pid", "pid_of_sender", "uid_of_sender", "user_of_uid",
"context_of_sender", "command_of_sender", "user_of_sender",
"dbus_to_python", "dbus_signature",
"dbus_introspection_prepare_properties",
"dbus_introspection_add_properties" ]
import dbus
import pwd
import sys
from xml.dom import minidom
from firewall.core.logger import log
PY2 = sys.version < '3'
def command_of_pid(pid):
""" Get command for pid from /proc """
try:
with open("/proc/%d/cmdline" % pid, "r") as f:
cmd = f.readlines()[0].replace('\0', " ").strip()
except Exception:
return None
return cmd
def pid_of_sender(bus, sender):
""" Get pid from sender string using
org.freedesktop.DBus.GetConnectionUnixProcessID """
dbus_obj = bus.get_object('org.freedesktop.DBus', '/org/freedesktop/DBus')
dbus_iface = dbus.Interface(dbus_obj, 'org.freedesktop.DBus')
try:
pid = int(dbus_iface.GetConnectionUnixProcessID(sender))
except ValueError:
return None
return pid
def uid_of_sender(bus, sender):
""" Get user id from sender string using
org.freedesktop.DBus.GetConnectionUnixUser """
dbus_obj = bus.get_object('org.freedesktop.DBus', '/org/freedesktop/DBus')
dbus_iface = dbus.Interface(dbus_obj, 'org.freedesktop.DBus')
try:
uid = int(dbus_iface.GetConnectionUnixUser(sender))
except ValueError:
return None
return uid
def user_of_uid(uid):
""" Get user for uid from pwd """
try:
pws = pwd.getpwuid(uid)
except Exception:
return None
return pws[0]
def context_of_sender(bus, sender):
""" Get SELinux context from sender string using
org.freedesktop.DBus.GetConnectionSELinuxSecurityContext """
dbus_obj = bus.get_object('org.freedesktop.DBus', '/org/freedesktop/DBus')
dbus_iface = dbus.Interface(dbus_obj, 'org.freedesktop.DBus')
try:
context = dbus_iface.GetConnectionSELinuxSecurityContext(sender)
except Exception:
return None
return "".join(map(chr, dbus_to_python(context)))
def command_of_sender(bus, sender):
""" Return command of D-Bus sender """
return command_of_pid(pid_of_sender(bus, sender))
def user_of_sender(bus, sender):
return user_of_uid(uid_of_sender(bus, sender))
def dbus_to_python(obj, expected_type=None):
if obj is None:
python_obj = obj
elif isinstance(obj, dbus.Boolean):
python_obj = bool(obj)
elif isinstance(obj, dbus.String):
python_obj = obj.encode('utf-8') if PY2 else str(obj)
elif PY2 and isinstance(obj, dbus.UTF8String): # Python3 has no UTF8String
python_obj = str(obj)
elif isinstance(obj, dbus.ObjectPath):
python_obj = str(obj)
elif isinstance(obj, dbus.Byte) or \
isinstance(obj, dbus.Int16) or \
isinstance(obj, dbus.Int32) or \
isinstance(obj, dbus.Int64) or \
isinstance(obj, dbus.UInt16) or \
isinstance(obj, dbus.UInt32) or \
isinstance(obj, dbus.UInt64):
python_obj = int(obj)
elif isinstance(obj, dbus.Double):
python_obj = float(obj)
elif isinstance(obj, dbus.Array):
python_obj = [dbus_to_python(x) for x in obj]
elif isinstance(obj, dbus.Struct):
python_obj = tuple([dbus_to_python(x) for x in obj])
elif isinstance(obj, dbus.Dictionary):
python_obj = {dbus_to_python(k): dbus_to_python(v) for k, v in obj.items()}
elif isinstance(obj, bool) or \
isinstance(obj, str) or isinstance(obj, bytes) or \
isinstance(obj, int) or isinstance(obj, float) or \
isinstance(obj, list) or isinstance(obj, tuple) or \
isinstance(obj, dict):
python_obj = obj
else:
raise TypeError("Unhandled %s" % repr(obj))
if expected_type is not None:
if (expected_type == bool and not isinstance(python_obj, bool)) or \
(expected_type == str and not isinstance(python_obj, str)) or \
(expected_type == int and not isinstance(python_obj, int)) or \
(expected_type == float and not isinstance(python_obj, float)) or \
(expected_type == list and not isinstance(python_obj, list)) or \
(expected_type == tuple and not isinstance(python_obj, tuple)) or \
(expected_type == dict and not isinstance(python_obj, dict)):
raise TypeError("%s is %s, expected %s" % (python_obj, type(python_obj), expected_type))
return python_obj
def dbus_signature(obj):
if isinstance(obj, dbus.Boolean):
return 'b'
elif isinstance(obj, dbus.String):
return 's'
elif isinstance(obj, dbus.ObjectPath):
return 'o'
elif isinstance(obj, dbus.Byte):
return 'y'
elif isinstance(obj, dbus.Int16):
return 'n'
elif isinstance(obj, dbus.Int32):
return 'i'
elif isinstance(obj, dbus.Int64):
return 'x'
elif isinstance(obj, dbus.UInt16):
return 'q'
elif isinstance(obj, dbus.UInt32):
return 'u'
elif isinstance(obj, dbus.UInt64):
return 't'
elif isinstance(obj, dbus.Double):
return 'd'
elif isinstance(obj, dbus.Array):
if len(obj.signature) > 1:
return 'a(%s)' % obj.signature
else:
return 'a%s' % obj.signature
elif isinstance(obj, dbus.Struct):
return '(%s)' % obj.signature
elif isinstance(obj, dbus.Dictionary):
return 'a{%s}' % obj.signature
elif PY2 and isinstance(obj, dbus.UTF8String):
return 's'
else:
raise TypeError("Unhandled %s" % repr(obj))
def dbus_introspection_prepare_properties(obj, interface, access=None):
if access is None:
access = { }
if not hasattr(obj, "_fw_dbus_properties"):
setattr(obj, "_fw_dbus_properties", { })
dip = getattr(obj, "_fw_dbus_properties")
dip[interface] = { }
try:
_dict = obj.GetAll(interface)
except Exception:
_dict = { }
for key,value in _dict.items():
dip[interface][key] = { "type": dbus_signature(value) }
if key in access:
dip[interface][key]["access"] = access[key]
else:
dip[interface][key]["access"] = "read"
def dbus_introspection_add_properties(obj, data, interface):
doc = minidom.parseString(data)
if hasattr(obj, "_fw_dbus_properties"):
for node in doc.getElementsByTagName("interface"):
if node.hasAttribute("name") and \
node.getAttribute("name") == interface:
dip = { }
if getattr(obj, "_fw_dbus_properties"):
dip = getattr(obj, "_fw_dbus_properties")
if interface in dip:
for key,value in dip[interface].items():
prop = doc.createElement("property")
prop.setAttribute("name", key)
prop.setAttribute("type", value["type"])
prop.setAttribute("access", value["access"])
node.appendChild(prop)
log.debug10(doc.toxml())
new_data = doc.toxml()
doc.unlink()
return new_data
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