/usr/lib/python2.7/dist-packages/zope/security/proxy.py is in python-zope.security 4.0.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Helper functions for Proxies.
"""
import functools
import sys
from zope.proxy import PyProxyBase
from zope.security._compat import PYPY
from zope.security.interfaces import ForbiddenAttribute
def _check_name(meth, wrap_result=True):
name = meth.__name__
def _wrapper(self, *args, **kw):
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check(wrapped, name)
res = meth(self, *args, **kw)
if not wrap_result:
return res
return checker.proxy(res)
return functools.update_wrapper(_wrapper, meth)
def _check_name_inplace(meth):
name = meth.__name__
def _wrapper(self, *args, **kw):
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check(wrapped, name)
w_meth = getattr(wrapped, name, None)
if w_meth is not None:
# The proxy object cannot change; we are modifying in place.
self._wrapped = w_meth(*args, **kw)
return self
x_name = '__%s__' % name[3:-2]
return ProxyPy(getattr(wrapped, x_name)(*args, **kw), checker)
return functools.update_wrapper(_wrapper, meth)
def _fmt_address(obj):
# Try to replicate PyString_FromString("%p", obj), which actually uses
# the platform sprintf(buf, "%p", obj), which we cannot access from Python
# directly (and ctypes seems like overkill).
if sys.platform == 'win32':
return '0x%08X' % id(obj)
else:
return '0x%0x' % id(obj)
class ProxyPy(PyProxyBase):
__slots__ = ('_wrapped', '_checker')
def __new__(cls, value, checker):
inst = super(PyProxyBase, cls).__new__(cls)
inst._wrapped = value
inst._checker = checker
return inst
def __init__(self, value, checker):
if checker is None:
raise ValueError('checker may now be None')
self._wrapped = value
self._checker = checker
# Attribute protocol
def __getattribute__(self, name):
if name in ('_wrapped', '_checker'):
# Only allow _wrapped and _checker to be accessed from inside.
if sys._getframe(1).f_locals.get('self') is not self:
raise AttributeError(name)
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
if name == '_wrapped':
return wrapped
checker = super(PyProxyBase, self).__getattribute__('_checker')
if name == '_checker':
return checker
if name not in ('__cmp__', '__hash__', '__bool__', '__nonzero__',
'__lt__', '__le__', '__eq__', '__ne__', '__ge__',
'__gt__'):
checker.check_getattr(wrapped, name)
if name in ('__reduce__', '__reduce_ex__'):
# The superclass specifically denies access to __reduce__
# and __reduce__ex__, not letting proxies be pickled. But
# for backwards compatibility, we need to be able to
# pickle proxies. See checker:Global for an example.
val = getattr(wrapped, name)
elif name == '__module__':
# The superclass deals with descriptors found in the type
# of this object just like the Python language spec states, letting
# them have precedence over things found in the instance. This
# normally makes us a better proxy implementation. However, the
# C version of this code in _proxy doesn't take that same care and instead
# uses the generic object attribute access methods directly on
# the wrapped object. This is a behaviour difference; so far, it's
# only been noticed for the __module__ attribute, which checker:Global
# wants to override but couldn't because this object's type's __module__ would
# get in the way. That broke pickling, and checker:Global can't return
# anything more sophisticated than a str (a tuple) because it gets proxied
# and breaks pickling again. Our solution is to match the C version for this
# one attribute.
val = getattr(wrapped, name)
else:
val = super(ProxyPy, self).__getattribute__(name)
return checker.proxy(val)
def __getattr__(self, name):
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check_getattr(wrapped, name)
return checker.proxy(getattr(wrapped, name))
def __setattr__(self, name, value):
if name in ('_wrapped', '_checker'):
return super(PyProxyBase, self).__setattr__(name, value)
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check_setattr(wrapped, name)
setattr(wrapped, name, value)
def __delattr__(self, name):
if name in ('_wrapped', '_checker'):
raise AttributeError()
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check_setattr(wrapped, name)
delattr(wrapped, name)
@_check_name
def __getslice__(self, start, end):
try:
return self._wrapped.__getslice__(start, end)
except:
getitem = PyProxyBase.__getattribute__(self, '__getitem__')
return getitem(slice(start, end))
@_check_name
def __setslice__(self, i, j, value):
try:
return self._wrapped.__setslice__(i, j, value)
except:
setitem = PyProxyBase.__getattribute__(self, '__setitem__')
return setitem(slice(i, j), value)
def __cmp__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return cmp(wrapped, other)
def __lt__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped < other
def __le__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped <= other
def __eq__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped == other
def __ne__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped != other
def __ge__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped >= other
def __gt__(self, other):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return wrapped > other
def __hash__(self):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return hash(wrapped)
def __nonzero__(self):
# no check
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return bool(wrapped)
__bool__ = __nonzero__
def __coerce__(self, other):
# For some reason _check_name does not work for coerce()
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
checker = super(PyProxyBase, self).__getattribute__('_checker')
checker.check(wrapped, '__coerce__')
return super(ProxyPy, self).__coerce__(other)
def __str__(self):
try:
return _check_name(PyProxyBase.__str__)(self)
except:
# The C implementation catches all exceptions.
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return '<security proxied %s.%s instance at %s>' %(
wrapped.__class__.__module__, wrapped.__class__.__name__,
_fmt_address(wrapped))
def __repr__(self):
try:
return _check_name(PyProxyBase.__repr__)(self)
except:
# The C implementation catches all exceptions.
wrapped = super(PyProxyBase, self).__getattribute__('_wrapped')
return '<security proxied %s.%s instance at %s>' %(
wrapped.__class__.__module__, wrapped.__class__.__name__,
_fmt_address(wrapped))
for name in ['__call__',
#'__repr__',
#'__str__',
'__unicode__',
'__reduce__',
'__reduce_ex__',
#'__lt__', # Unchecked in C proxy (rich coparison)
#'__le__', # Unchecked in C proxy (rich coparison)
#'__eq__', # Unchecked in C proxy (rich coparison)
#'__ne__', # Unchecked in C proxy (rich coparison)
#'__ge__', # Unchecked in C proxy (rich coparison)
#'__gt__', # Unchecked in C proxy (rich coparison)
#'__nonzero__', # Unchecked in C proxy (rich coparison)
#'__bool__', # Unchecked in C proxy (rich coparison)
#'__hash__', # Unchecked in C proxy (rich coparison)
#'__cmp__', # Unchecked in C proxy
'__getitem__',
'__setitem__',
'__delitem__',
'__iter__',
'__next__',
'next',
'__contains__',
'__neg__',
'__pos__',
'__abs__',
'__invert__',
'__complex__',
'__int__',
'__float__',
'__long__',
'__oct__',
'__hex__',
'__index__',
'__add__',
'__sub__',
'__mul__',
'__div__',
'__truediv__',
'__floordiv__',
'__mod__',
'__divmod__',
'__pow__',
'__radd__',
'__rsub__',
'__rmul__',
'__rdiv__',
'__rtruediv__',
'__rfloordiv__',
'__rmod__',
'__rdivmod__',
'__rpow__',
'__lshift__',
'__rshift__',
'__and__',
'__xor__',
'__or__',
'__rlshift__',
'__rrshift__',
'__rand__',
'__rxor__',
'__ror__',
]:
meth = getattr(PyProxyBase, name)
setattr(ProxyPy, name, _check_name(meth))
for name in ['__len__',
]:
meth = getattr(PyProxyBase, name)
setattr(ProxyPy, name, _check_name(meth, False))
for name in ['__iadd__',
'__isub__',
'__imul__',
'__idiv__',
'__itruediv__',
'__ifloordiv__',
'__imod__',
'__ilshift__',
'__irshift__',
'__iand__',
'__ixor__',
'__ior__',
'__ipow__',
]:
meth = getattr(PyProxyBase, name)
setattr(ProxyPy, name, _check_name_inplace(meth))
def getCheckerPy(proxy):
return super(PyProxyBase, proxy).__getattribute__('_checker')
if PYPY:
_builtin_isinstance = __builtins__.isinstance
else:
_builtin_isinstance = __builtins__['isinstance']
def getObjectPy(proxy):
if not _builtin_isinstance(proxy, ProxyPy):
return proxy
return super(PyProxyBase, proxy).__getattribute__('_wrapped')
try:
from zope.security._proxy import _Proxy
except (ImportError, AttributeError): #pragma NO COVER PyPy / PURE_PYTHON
getChecker = getCheckerPy
getObject = getObjectPy
Proxy = ProxyPy
else: #pragma NO COVER CPython
from zope.security._proxy import getChecker
from zope.security._proxy import getObject
Proxy = _Proxy
removeSecurityProxy = getObject
def getTestProxyItems(proxy):
"""Return a sorted sequence of checker names and permissions for testing
"""
checker = getChecker(proxy)
return sorted(checker.get_permissions.items())
def isinstance(object, cls):
"""Test whether an object is an instance of a type.
This works even if the object is security proxied.
"""
# The removeSecurityProxy call is OK here because it is *only*
# being used for isinstance
return _builtin_isinstance(removeSecurityProxy(object), cls)
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