"""
Implements a permissions editor for services.
Service can be specified as plain name for local machine,
or as a remote service of the form \\machinename\service
"""
import os
import win32com.server.policy
import win32security, ntsecuritycon, win32con
import pythoncom, win32api, win32service
from win32com.authorization import authorization
SERVICE_GENERIC_EXECUTE=win32service.SERVICE_START|win32service.SERVICE_STOP|win32service.SERVICE_PAUSE_CONTINUE|win32service.SERVICE_USER_DEFINED_CONTROL
SERVICE_GENERIC_READ=win32service.SERVICE_QUERY_CONFIG|win32service.SERVICE_QUERY_STATUS|win32service.SERVICE_INTERROGATE|win32service.SERVICE_ENUMERATE_DEPENDENTS
SERVICE_GENERIC_WRITE=win32service.SERVICE_CHANGE_CONFIG
from ntsecuritycon import STANDARD_RIGHTS_READ,STANDARD_RIGHTS_WRITE,STANDARD_RIGHTS_EXECUTE,\
WRITE_OWNER, WRITE_DAC, READ_CONTROL, \
SI_ADVANCED, SI_EDIT_AUDITS, SI_EDIT_PROPERTIES, SI_EDIT_ALL, SI_PAGE_TITLE, SI_RESET, \
SI_ACCESS_SPECIFIC, SI_ACCESS_GENERAL, SI_ACCESS_CONTAINER, SI_ACCESS_PROPERTY, \
OBJECT_INHERIT_ACE, CONTAINER_INHERIT_ACE, INHERIT_ONLY_ACE, \
SI_PAGE_PERM, SI_PAGE_ADVPERM, SI_PAGE_AUDIT, SI_PAGE_OWNER, PSPCB_SI_INITDIALOG, \
SI_CONTAINER
from win32security import OBJECT_INHERIT_ACE,CONTAINER_INHERIT_ACE,INHERIT_ONLY_ACE
from win32com.shell.shellcon import PSPCB_RELEASE,PSPCB_CREATE## Msg parameter to PropertySheetPageCallback
frompythoncomIID_NULL
class ServiceSecurity(win32com.server.policy.DesignatedWrapPolicy):
_com_interfaces_=[authorization.IID_ISecurityInformation]
_public_methods_=['GetObjectInformation','GetSecurity','SetSecurity','GetAccessRights',
'GetInheritTypes','MapGeneric','PropertySheetPageCallback']
def __init__(self, ServiceName):
self.ServiceName=ServiceName
self._wrap_(self)
def GetObjectInformation(self):
"""Identifies object whose security will be modified, and determines options available
to the end user"""
flags=SI_ADVANCED|SI_EDIT_ALL|SI_PAGE_TITLE|SI_RESET
hinstance=0 ## handle to module containing string resources
servername='' ## name of authenticating server if not local machine
## service name can contain remote machine name of the form \\Server\ServiceName
objectname=os.path.split(self.ServiceName)[1]
pagetitle='Service Permissions for '+self.ServiceName
objecttype=IID_NULL
return flags, hinstance, servername, objectname, pagetitle, objecttype
def GetSecurity(self, requestedinfo, bdefault):
"""Requests the existing permissions for object"""
if bdefault:
return win32security.SECURITY_DESCRIPTOR()
else:
return win32security.GetNamedSecurityInfo(self.ServiceName, win32security.SE_SERVICE, requestedinfo)
def SetSecurity(self, requestedinfo, sd):
"""Applies permissions to the object"""
owner=sd.GetSecurityDescriptorOwner()
group=sd.GetSecurityDescriptorGroup()
dacl=sd.GetSecurityDescriptorDacl()
sacl=sd.GetSecurityDescriptorSacl()
win32security.SetNamedSecurityInfo(self.ServiceName, win32security.SE_SERVICE, requestedinfo,
owner, group, dacl, sacl)
def GetAccessRights(self, objecttype, flags):
"""Returns a tuple of (AccessRights, DefaultAccess), where AccessRights is a sequence of tuples representing
SI_ACCESS structs, containing (guid, access mask, Name, flags). DefaultAccess indicates which of the
AccessRights will be used initially when a new ACE is added (zero based).
Flags can contain SI_ACCESS_SPECIFIC,SI_ACCESS_GENERAL,SI_ACCESS_CONTAINER,SI_ACCESS_PROPERTY,
CONTAINER_INHERIT_ACE,INHERIT_ONLY_ACE,OBJECT_INHERIT_ACE
"""
## input flags: SI_ADVANCED,SI_EDIT_AUDITS,SI_EDIT_PROPERTIES indicating which property sheet is requesting the rights
if (objecttype is not None) and (objecttype!=IID_NULL):
## Not relevent for services
raise NotImplementedError("Object type is not supported")
## ???? for some reason, the DACL for a service will not retain ACCESS_SYSTEM_SECURITY in an ACE ????
## (IID_NULL, win32con.ACCESS_SYSTEM_SECURITY, 'View/change audit settings', SI_ACCESS_SPECIFIC),
accessrights=[
(IID_NULL, win32service.SERVICE_ALL_ACCESS, 'Full control', SI_ACCESS_GENERAL),
(IID_NULL, SERVICE_GENERIC_READ, 'Generic read', SI_ACCESS_GENERAL),
(IID_NULL, SERVICE_GENERIC_WRITE, 'Generic write', SI_ACCESS_GENERAL),
(IID_NULL, SERVICE_GENERIC_EXECUTE, 'Start/Stop/Pause service', SI_ACCESS_GENERAL),
(IID_NULL, READ_CONTROL, 'Read Permissions', SI_ACCESS_GENERAL),
(IID_NULL, WRITE_DAC, 'Change permissions', SI_ACCESS_GENERAL),
(IID_NULL, WRITE_OWNER, 'Change owner', SI_ACCESS_GENERAL),
(IID_NULL, win32con.DELETE, 'Delete service', SI_ACCESS_GENERAL),
(IID_NULL, win32service.SERVICE_START, 'Start service', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_STOP, 'Stop service', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_PAUSE_CONTINUE, 'Pause/unpause service', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_USER_DEFINED_CONTROL, 'Execute user defined operations', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_QUERY_CONFIG, 'Read configuration', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_CHANGE_CONFIG, 'Change configuration', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_ENUMERATE_DEPENDENTS, 'List dependent services', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_QUERY_STATUS, 'Query status', SI_ACCESS_SPECIFIC),
(IID_NULL, win32service.SERVICE_INTERROGATE, 'Query status (immediate)', SI_ACCESS_SPECIFIC),
]
return (accessrights, 0)
def MapGeneric(self, guid, aceflags, mask):
""" Converts generic access rights to specific rights.
"""
return win32security.MapGenericMask(mask,
(SERVICE_GENERIC_READ, SERVICE_GENERIC_WRITE, SERVICE_GENERIC_EXECUTE, win32service.SERVICE_ALL_ACCESS))
def GetInheritTypes(self):
"""Specifies which types of ACE inheritance are supported.
Services don't use any inheritance
"""
return ((IID_NULL, 0, 'Only current object'),)
def PropertySheetPageCallback(self, hwnd, msg, pagetype):
"""Invoked each time a property sheet page is created or destroyed."""
## page types from SI_PAGE_TYPE enum: SI_PAGE_PERM SI_PAGE_ADVPERM SI_PAGE_AUDIT SI_PAGE_OWNER
## msg: PSPCB_CREATE, PSPCB_RELEASE, PSPCB_SI_INITDIALOG
return None
def EditSecurity(self, owner_hwnd=0):
"""Creates an ACL editor dialog based on parameters returned by interface methods"""
isi=pythoncom.WrapObject(self, authorization.IID_ISecurityInformation, pythoncom.IID_IUnknown)
authorization.EditSecurity(owner_hwnd, isi)
if __name__=='__main__':
# Find the first service on local machine and edit its permissions
scm = win32service.OpenSCManager(None, None, win32service.SC_MANAGER_ENUMERATE_SERVICE)
svcs=win32service.EnumServicesStatus(scm)
win32service.CloseServiceHandle(scm)
si=ServiceSecurity(svcs[0][0])
si.EditSecurity()
|