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Edit File : dbus_utils.py \| Size : 7.82 KB
# -- 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 Back

Edit File : dbus_utils.py | Size : 7.82 KB

# -*- 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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