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#this code is copied/stolen/borrowed/modified from various sources including #https://github.com/zopefoundation/AccessControl #https://github.com/zopefoundation/RestrictedPython #https://github.com/danthedeckie/simpleeval #hopefully we are standing on giants' shoulders import sys, os, ast, re, weakref, time, copy, math from reportlab import isPy3 isPy2 = not isPy3 eval_debug = int(os.environ.get('EVAL_DEBUG','0')) strTypes = basestring if isPy2 else (bytes,str) haveNameConstant = hasattr(ast,'NameConstant') haveMatMult = haveMultiStarred = hasattr(ast,'MatMult') import textwrap class BadCode(ValueError): pass # For AugAssign the operator must be converted to a string. augOps = { # Shared by python2 and python3 ast.Add: '+=', ast.Sub: '-=', ast.Mult: '*=', ast.Div: '/=', ast.Mod: '%=', ast.Pow: '**=', ast.LShift: '<<=', ast.RShift: '>>=', ast.BitOr: '|=', ast.BitXor: '^=', ast.BitAnd: '&=', ast.FloorDiv: '//=' } if haveMatMult: augOps[ast.MatMult] = '@=' # For creation allowed magic method names. See also # https://docs.python.org/3/reference/datamodel.html#special-method-names __allowed_magic_methods__ = frozenset([ '__init__', '__contains__', '__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__', ]) __rl_unsafe__ = frozenset('''builtins breakpoint __annotations__ co_argcount co_cellvars co_code co_consts __code__ co_filename co_firstlineno co_flags co_freevars co_kwonlyargcount co_lnotab co_name co_names co_nlocals co_posonlyargcount co_stacksize co_varnames cr_await cr_code cr_frame cr_origin cr_running __defaults__ f_back f_builtins f_code f_exc_traceback f_exc_type f_exc_value f_globals f_lasti f_lineno f_locals f_restricted f_trace __func__ func_code func_defaults func_doc func_globals func_name gi_code gi_frame gi_running gi_yieldfrom __globals__ im_class im_func im_self __iter__ __kwdefaults__ __module__ __name__ next __qualname__ __self__ tb_frame tb_lasti tb_lineno tb_next globals vars locals'''.split() ) __rl_unsafe_re__ = re.compile(r'\b(?:%s)' % '|'.join(__rl_unsafe__),re.M) def copy_locations(new_node, old_node): new_node.lineno = old_node.lineno new_node.col_offset = old_node.col_offset ast.fix_missing_locations(new_node) class UntrustedAstTransformer(ast.NodeTransformer): def __init__(self, names_seen=None, nameIsAllowed=None): super(UntrustedAstTransformer, self).__init__() self.names_seen = {} if names_seen is None else names_seen self.nameIsAllowed = nameIsAllowed # Global counter to construct temporary variable names. self._tmp_idx = 0 self._tmp_pfx = '_tmp%s' % repr(time.time()).replace('.','') @property def tmpName(self): name = '%s%s' % (self._tmp_pfx,self._tmp_idx) self._tmp_idx += 1 return name def error(self, node, msg): raise BadCode('Line %s: %s' % (getattr(node, 'lineno', '??'), msg)) def guard_iter(self, node): """ Converts: for x in expr to for x in __rl_getiter__(expr) Also used for * list comprehensions * dict comprehensions * set comprehensions * generator expresions """ node = self.visit_children(node) if isinstance(node.target, ast.Tuple): spec = self.gen_unpack_spec(node.target) new_iter = ast.Call( func=ast.Name('__rl_iter_unpack_sequence__', ast.Load()), args=[node.iter, spec, ast.Name('__rl_getiter__', ast.Load())], keywords=[]) else: new_iter = ast.Call( func=ast.Name('__rl_getiter__', ast.Load()), args=[node.iter], keywords=[]) copy_locations(new_iter, node.iter) node.iter = new_iter return node def is_starred(self, ob): if isPy3: return isinstance(ob, ast.Starred) else: return False def gen_unpack_spec(self, tpl): """Generate a specification for '__rl_unpack_sequence__'. This spec is used to protect sequence unpacking. The primary goal of this spec is to tell which elements in a sequence are sequences again. These 'child' sequences have to be protected again. For example there is a sequence like this: (a, (b, c), (d, (e, f))) = g On a higher level the spec says: - There is a sequence of len 3 - The element at index 1 is a sequence again with len 2 - The element at index 2 is a sequence again with len 2 - The element at index 1 in this subsequence is a sequence again with len 2 With this spec '__rl_unpack_sequence__' does something like this for protection (len checks are omitted): t = list(__rl_getiter__(g)) t[1] = list(__rl_getiter__(t[1])) t[2] = list(__rl_getiter__(t[2])) t[2][1] = list(__rl_getiter__(t[2][1])) return t The 'real' spec for the case above is then: spec = { 'min_len': 3, 'childs': ( (1, {'min_len': 2, 'childs': ()}), (2, { 'min_len': 2, 'childs': ( (1, {'min_len': 2, 'childs': ()}) ) } ) ) } So finally the assignment above is converted into: (a, (b, c), (d, (e, f))) = __rl_unpack_sequence__(g, spec) """ spec = ast.Dict(keys=[], values=[]) spec.keys.append(ast.Str('childs')) spec.values.append(ast.Tuple([], ast.Load())) # starred elements in a sequence do not contribute into the min_len. # For example a, b, *c = g # g must have at least 2 elements, not 3. 'c' is empyt if g has only 2. min_len = len([ob for ob in tpl.elts if not self.is_starred(ob)]) offset = 0 for idx, val in enumerate(tpl.elts): # After a starred element specify the child index from the back. # Since it is unknown how many elements from the sequence are # consumed by the starred element. # For example a, *b, (c, d) = g # Then (c, d) has the index '-1' if self.is_starred(val): offset = min_len + 1 elif isinstance(val, ast.Tuple): el = ast.Tuple([], ast.Load()) el.elts.append(ast.Num(idx - offset)) el.elts.append(self.gen_unpack_spec(val)) spec.values[0].elts.append(el) spec.keys.append(ast.Str('min_len')) spec.values.append(ast.Num(min_len)) return spec def protect_unpack_sequence(self, target, value): spec = self.gen_unpack_spec(target) return ast.Call( func=ast.Name('__rl_unpack_sequence__', ast.Load()), args=[value, spec, ast.Name('__rl_getiter__', ast.Load())], keywords=[]) def gen_unpack_wrapper(self, node, target, ctx='store'): """Helper function to protect tuple unpacks. node: used to copy the locations for the new nodes. target: is the tuple which must be protected. ctx: Defines the context of the returned temporary node. It returns a tuple with two element. Element 1: Is a temporary name node which must be used to replace the target. The context (store, param) is defined by the 'ctx' parameter.. Element 2: Is a try .. finally where the body performs the protected tuple unpack of the temporary variable into the original target. """ # Generate a tmp name to replace the tuple with. tnam = self.tmpName # Generates an expressions which protects the unpack. # converter looks like 'wrapper(tnam)'. # 'wrapper' takes care to protect sequence unpacking with __rl_getiter__. converter = self.protect_unpack_sequence( target, ast.Name(tnam, ast.Load())) # Assign the expression to the original names. # Cleanup the temporary variable. # Generates: # try: # # converter is 'wrapper(tnam)' # arg = converter # finally: # del tmp_arg try_body = [ast.Assign(targets=[target], value=converter)] finalbody = [self.gen_del_stmt(tnam)] if isPy2: cleanup = ast.TryFinally(body=try_body, finalbody=finalbody) else: cleanup = ast.Try( body=try_body, finalbody=finalbody, handlers=[], orelse=[]) if ctx == 'store': ctx = ast.Store() elif ctx == 'param': ctx = ast.Param() else: # pragma: no cover # Only store and param are defined ctx. raise NotImplementedError('bad ctx "%s"' % type(ctx)) # This node is used to catch the tuple in a tmp variable. tmp_target = ast.Name(tnam, ctx) copy_locations(tmp_target, node) copy_locations(cleanup, node) return (tmp_target, cleanup) def gen_none_node(self): return ast.NameConstant(value=None) if hasNameConstant else ast.Name(id='None', ctx=ast.Load()) def gen_lambda(self, args, body): return ast.Lambda( args=ast.arguments( args=args, vararg=None, kwarg=None, defaults=[]), body=body) def gen_del_stmt(self, name_to_del): return ast.Delete(targets=[ast.Name(name_to_del, ast.Del())]) def transform_slice(self, slice_): """Transform slices into function parameters. ast.Slice nodes are only allowed within a ast.Subscript node. To use a slice as an argument of ast.Call it has to be converted. Conversion is done by calling the 'slice' function from builtins """ if isinstance(slice_, ast.Index): return slice_.value elif isinstance(slice_, ast.Slice): # Create a python slice object. args = [] if slice_.lower: args.append(slice_.lower) else: args.append(self.gen_none_node()) if slice_.upper: args.append(slice_.upper) else: args.append(self.gen_none_node()) if slice_.step: args.append(slice_.step) else: args.append(self.gen_none_node()) return ast.Call( func=ast.Name('slice', ast.Load()), args=args, keywords=[]) elif isinstance(slice_, ast.ExtSlice): dims = ast.Tuple([], ast.Load()) for item in slice_.dims: dims.elts.append(self.transform_slice(item)) return dims else: # pragma: no cover # Index, Slice and ExtSlice are only defined Slice types. raise NotImplementedError("Unknown slice type: %s" % slice_) def isAllowedName(self, node, name): if name is None: return self.nameIsAllowed(name) def check_function_argument_names(self, node): # In python3 arguments are always identifiers. # In python2 the 'Python.asdl' specifies expressions, but # the python grammer allows only identifiers or a tuple of # identifiers. If its a tuple 'tuple parameter unpacking' is used, # which is gone in python3. # See https://www.python.org/dev/peps/pep-3113/ if isPy2: # Needed to handle nested 'tuple parameter unpacking'. # For example 'def foo((a, b, (c, (d, e)))): pass' to_check = list(node.args.args) while to_check: item = to_check.pop() if isinstance(item, ast.Tuple): to_check.extend(item.elts) else: self.isAllowedName(node, item.id) self.isAllowedName(node, node.args.vararg) self.isAllowedName(node, node.args.kwarg) else: for arg in node.args.args: self.isAllowedName(node, arg.arg) if node.args.vararg: self.isAllowedName(node, node.args.vararg.arg) if node.args.kwarg: self.isAllowedName(node, node.args.kwarg.arg) for arg in node.args.kwonlyargs: self.isAllowedName(node, arg.arg) def check_import_names(self, node): """Check the names being imported. This is a protection against rebinding dunder names like __rl_getitem__,__rl_set__ via imports. => 'from _a import x' is ok, because '_a' is not added to the scope. """ for name in node.names: if '*' in name.name: self.error(node, '"*" imports are not allowed.') self.isAllowedName(node, name.name) if name.asname: self.isAllowedName(node, name.asname) return self.visit_children(node) def gen_attr_check(self, node, attr_name): """Check if 'attr_name' is allowed on the object in node. It generates (_getattr_(node, attr_name) and node). """ call_getattr = ast.Call( func=ast.Name('__rl_getattr__', ast.Load()), args=[node, ast.Str(attr_name)], keywords=[]) return ast.BoolOp(op=ast.And(), values=[call_getattr, node]) def visit_Constant(self, node): """Allow constant literals with restriction for Ellipsis. Constant replaces Num, Str, Bytes, NameConstant and Ellipsis in Python 3.8+. :see: https://docs.python.org/dev/whatsnew/3.8.html#deprecated """ if node.value is Ellipsis: # Deny using `...`. # Special handling necessary as ``self.not_allowed(node)`` # would return the Error Message: # 'Constant statements are not allowed.' # which is only partial true. self.error(node, 'Ellipsis statements are not allowed.') return return self.visit_children(node) # ast for Variables def visit_Name(self, node): node = self.visit_children(node) if isinstance(node.ctx, ast.Load): if node.id == 'print': self.error(node,'print function is not allowed') self.names_seen[node.id] = True self.isAllowedName(node, node.id) return node def visit_Call(self, node): """Checks calls with '*args' and '**kwargs'. Note: The following happens only if '*args' or '**kwargs' is used. Transfroms 'foo(<all the possible ways of args>)' into __rl_apply__(foo, <all the possible ways for args>) The thing is that '__rl_apply__' has only '*args', '**kwargs', so it gets Python to collapse all the myriad ways to call functions into one manageable from. From there, '__rl_apply__()' wraps args and kws in guarded accessors, then calls the function, returning the value. """ if isinstance(node.func, ast.Name): if node.func.id == 'exec': self.error(node, 'Exec calls are not allowed.') elif node.func.id == 'eval': self.error(node, 'Eval calls are not allowed.') needs_wrap = False # In python2.7 till python3.4 '*args', '**kwargs' have dedicated # attributes on the ast.Call node. # In python 3.5 and greater this has changed due to the fact that # multiple '*args' and '**kwargs' are possible. # '*args' can be detected by 'ast.Starred' nodes. # '**kwargs' can be deteced by 'keyword' nodes with 'arg=None'. if haveMultiStarred: for pos_arg in node.args: if isinstance(pos_arg, ast.Starred): needs_wrap = True for keyword_arg in node.keywords: if keyword_arg.arg is None: needs_wrap = True else: if (node.starargs is not None) or (node.kwargs is not None): needs_wrap = True node = self.visit_children(node) #if not needs_wrap: # return node node.args.insert(0, node.func) node.func = ast.Name('__rl_apply__', ast.Load()) copy_locations(node.func, node.args[0]) return node def visit_Attribute(self, node): """Checks and mutates attribute access/assignment. 'a.b' becomes '__rl_getattr__(a, "b")' """ if node.attr.startswith('__') and node.attr != '__': self.error(node, '"%s" is an invalid attribute'%node.attr) if isinstance(node.ctx, ast.Load): node = self.visit_children(node) new_node = ast.Call( func=ast.Name('__rl_getattr__', ast.Load()), args=[node.value, ast.Str(node.attr)], keywords=[]) copy_locations(new_node, node) return new_node elif isinstance(node.ctx, (ast.Store, ast.Del)): node = self.visit_children(node) new_value = ast.Call( func=ast.Name('__rl_sd__', ast.Load()), args=[node.value], keywords=[]) copy_locations(new_value, node.value) node.value = new_value return node else: # pragma: no cover # Impossible Case only ctx Load, Store and Del are defined in ast. raise NotImplementedError("Unknown ctx type: %s" % type(node.ctx)) # Subscripting def visit_Subscript(self, node): """Transforms all kinds of subscripts. 'v[a]' becomes '__rl_getitem__(foo, a)' 'v[:b]' becomes '__rl_getitem__(foo, slice(None, b, None))' 'v[a:]' becomes '__rl_getitem__(foo, slice(a, None, None))' 'v[a:b]' becomes '__rl_getitem__(foo, slice(a, b, None))' 'v[a:b:c]' becomes '__rl_getitem__(foo, slice(a, b, c))' 'v[a,b:c] becomes '__rl_getitem__(foo, (a, slice(b, c, None)))' #'v[a] = c' becomes '_rl_write__(v)[a] = c' #'del v[a]' becomes 'del __rl_sd__(v)[a]' """ node = self.visit_children(node) # 'AugStore' and 'AugLoad' are defined in 'Python.asdl' as possible # 'expr_context'. However, according to Python/ast.c # they are NOT used by the implementation => No need to worry here. # Instead ast.c creates 'AugAssign' nodes, which can be visit_ed. if isinstance(node.ctx, ast.Load): new_node = ast.Call( func=ast.Name('__rl_getitem__', ast.Load()), args=[node.value, self.transform_slice(node.slice)], keywords=[]) copy_locations(new_node, node) return new_node elif isinstance(node.ctx, (ast.Del, ast.Store)): #new_value = ast.Call( # func=ast.Name('__rl_sd__', ast.Load()), # args=[node.value], # keywords=[]) #copy_locations(new_value, node) #node.value = new_value return node else: # pragma: no cover # Impossible Case only ctx Load, Store and Del are defined in ast. raise NotImplementedError("Unknown ctx type: %s" % type(node.ctx)) # Statements def visit_Assign(self, node): node = self.visit_children(node) if not any(isinstance(t, ast.Tuple) for t in node.targets): return node # Handle sequence unpacking. # For briefness this example omits cleanup of the temporary variables. # Check 'transform_tuple_assign' how its done. # # - Single target (with nested support) # (a, (b, (c, d))) = <exp> # is converted to # (a, t1) = __rl_getiter__(<exp>) # (b, t2) = __rl_getiter__(t1) # (c, d) = __rl_getiter__(t2) # # - Multi targets # (a, b) = (c, d) = <exp> # is converted to # (c, d) = __rl_getiter__(<exp>) # (a, b) = __rl_getiter__(<exp>) # Why is this valid ? The original bytecode for this multi targets # behaves the same way. # ast.NodeTransformer works with list results. # He injects it at the rightplace of the node's parent statements. new_nodes = [] # python fills the right most target first. for target in reversed(node.targets): if isinstance(target, ast.Tuple): wrapper = ast.Assign( targets=[target], value=self.protect_unpack_sequence(target, node.value)) new_nodes.append(wrapper) else: new_node = ast.Assign(targets=[target], value=node.value) new_nodes.append(new_node) for new_node in new_nodes: copy_locations(new_node, node) return new_nodes def visit_AugAssign(self, node): """Forbid certain kinds of AugAssign According to the language reference (and ast.c) the following nodes are are possible: Name, Attribute, Subscript Note that although augmented assignment of attributes and subscripts is disallowed, augmented assignment of names (such as 'n += 1') is allowed. 'n += 1' becomes 'n = __rl_augAssign__("+=", n, 1)' """ node = self.visit_children(node) if isinstance(node.target, ast.Attribute): self.error(node, "Augmented assignment of attributes is not allowed.") elif isinstance(node.target, ast.Subscript): self.error(node, "Augmented assignment of object items and slices is not allowed.") elif isinstance(node.target, ast.Name): new_node = ast.Assign( targets=[node.target], value=ast.Call( func=ast.Name('__rl_augAssign__', ast.Load()), args=[ ast.Str(augOps[type(node.op)]), ast.Name(node.target.id, ast.Load()), node.value ], keywords=[])) copy_locations(new_node, node) return new_node else: # pragma: no cover # Impossible Case - Only Node Types: # * Name # * Attribute # * Subscript # defined, those are checked before. raise NotImplementedError("Unknown target type: %s" % type(node.target)) def visit_While(node): self.visit_children(node) return node def visit_ExceptHandler(self, node): """Protect tuple unpacking on exception handlers. try: ..... except Exception as (a, b): .... becomes try: ..... except Exception as tmp: try: (a, b) = __rl_getiter__(tmp) finally: del tmp """ node = self.visit_children(node) if isPy3: self.isAllowedName(node, node.name) return node if not isinstance(node.name, ast.Tuple): return node tmp_target, unpack = self.gen_unpack_wrapper(node, node.name) # Replace the tuple with the temporary variable. node.name = tmp_target # Insert the unpack code within the body of the except clause. node.body.insert(0, unpack) return node def visit_With(self, node): """Protect tuple unpacking on with statements.""" node = self.visit_children(node) if isPy2: items = [node] else: items = node.items for item in reversed(items): if isinstance(item.optional_vars, ast.Tuple): tmp_target, unpack = self.gen_unpack_wrapper( node, item.optional_vars) item.optional_vars = tmp_target node.body.insert(0, unpack) return node # Function and class definitions def visit_FunctionDef(self, node): """Allow function definitions (`def`) with some restrictions.""" self.isAllowedName(node, node.name) self.check_function_argument_names(node) if isPy3: return node # Protect 'tuple parameter unpacking' with '__rl_getiter__'. unpacks = [] for index, arg in enumerate(list(node.args.args)): if isinstance(arg, ast.Tuple): tmp_target, unpack = self.gen_unpack_wrapper( node, arg, 'param') # Replace the tuple with a single (temporary) parameter. node.args.args[index] = tmp_target unpacks.append(unpack) # Add the unpacks at the front of the body. # Keep the order, so that tuple one is unpacked first. node.body[0:0] = unpacks return node def visit_Lambda(self, node): """Allow lambda with some restrictions.""" self.check_function_argument_names(node) node = self.visit_children(node) if isPy3: # Implicit Tuple unpacking is not anymore available in Python3 return node # Check for tuple parameters which need __rl_getiter__ protection if not any(isinstance(arg, ast.Tuple) for arg in node.args.args): return node # Wrap this lambda function with another. Via this wrapping it is # possible to protect the 'tuple arguments' with __rl_getiter__ outer_params = [] inner_args = [] for arg in node.args.args: if isinstance(arg, ast.Tuple): tnam = self.tmpName converter = self.protect_unpack_sequence( arg, ast.Name(tnam, ast.Load())) outer_params.append(ast.Name(tnam, ast.Param())) inner_args.append(converter) else: outer_params.append(arg) inner_args.append(ast.Name(arg.id, ast.Load())) body = ast.Call(func=node, args=inner_args, keywords=[]) new_node = self.gen_lambda(outer_params, body) if node.args.vararg: new_node.args.vararg = node.args.vararg body.starargs = ast.Name(node.args.vararg, ast.Load()) if node.args.kwarg: new_node.args.kwarg = node.args.kwarg body.kwargs = ast.Name(node.args.kwarg, ast.Load()) copy_locations(new_node, node) return new_node def visit_ClassDef(self, node): """Check the name of a class definition.""" self.isAllowedName(node, node.name) node = self.visit_children(node) if isPy2: new_class_node = node else: if any(keyword.arg == 'metaclass' for keyword in node.keywords): self.error(node, 'The keyword argument "metaclass" is not allowed.') CLASS_DEF = textwrap.dedent('''\ class %s(metaclass=__metaclass__): pass ''' % node.name) new_class_node = ast.parse(CLASS_DEF).body[0] new_class_node.body = node.body new_class_node.bases = node.bases new_class_node.decorator_list = node.decorator_list return new_class_node # Imports def visit_Import(self, node): return self.check_import_names(node) node = self.visit_children(node) new_node = ast.Call( func=ast.Name('__rl_add__', ast.Load()), args=[node.left, node.right], keywords=[]) copy_locations(new_node, node) return new_node def visit_BinOp(self,node): node = self.visit_children(node) op = node.op if isinstance(op,(ast.Mult,ast.Add,ast.Pow)): opf = ('__rl_mult__' if isinstance(op,ast.Mult) else '__rl_add__' if isinstance(op,ast.Add) else '__rl_pow__') new_node = ast.Call( func=ast.Name(opf, ast.Load()), args=[node.left, node.right], keywords=[]) copy_locations(new_node, node) return new_node return node visit_ImportFrom = visit_Import visit_For = guard_iter visit_comprehension = guard_iter def generic_visit(self, node): """Reject nodes which do not have a corresponding `visit` method.""" self.not_allowed(node) def not_allowed(self, node): self.error(node, '%s statements are not allowed.'%node.__class__.__name__) def visit_children(self, node): """Visit the contents of a node.""" return super(UntrustedAstTransformer, self).generic_visit(node) if eval_debug>=2: def visit(self, node): method = 'visit_' + node.__class__.__name__ visitor = getattr(self, method, self.generic_visit) print('visitor=%s=%r node=%r' % (method,visitor,node)) return visitor(node) visit_Ellipsis = not_allowed visit_MatMult = not_allowed visit_Exec = not_allowed visit_Nonlocal = not_allowed visit_AsyncFunctionDef = not_allowed visit_Await = not_allowed visit_AsyncFor = not_allowed visit_AsyncWith = not_allowed visit_Print = not_allowed visit_Num = visit_children visit_Str = visit_children visit_Bytes = visit_children visit_List = visit_children visit_Tuple = visit_children visit_Set = visit_children visit_Dict = visit_children visit_FormattedValue = visit_children visit_JoinedStr = visit_children visit_NameConstant = visit_children visit_Load = visit_children visit_Store = visit_children visit_Del = visit_children visit_Starred = visit_children visit_Expression = visit_children visit_Expr = visit_children visit_UnaryOp = visit_children visit_UAdd = visit_children visit_USub = visit_children visit_Not = visit_children visit_Invert = visit_children visit_Add = visit_children visit_Sub = visit_children visit_Mult = visit_children visit_Div = visit_children visit_FloorDiv = visit_children visit_Pow = visit_children visit_Mod = visit_children visit_LShift = visit_children visit_RShift = visit_children visit_BitOr = visit_children visit_BitXor = visit_children visit_BitAnd = visit_children visit_BoolOp = visit_children visit_And = visit_children visit_Or = visit_children visit_Compare = visit_children visit_Eq = visit_children visit_NotEq = visit_children visit_Lt = visit_children visit_LtE = visit_children visit_Gt = visit_children visit_GtE = visit_children visit_Is = visit_children visit_IsNot = visit_children visit_In = visit_children visit_NotIn = visit_children visit_keyword = visit_children visit_IfExp = visit_children visit_Index = visit_children visit_Slice = visit_children visit_ExtSlice = visit_children visit_ListComp = visit_children visit_SetComp = visit_children visit_GeneratorExp = visit_children visit_DictComp = visit_children visit_Raise = visit_children visit_Assert = visit_children visit_Delete = visit_children visit_Pass = visit_children visit_alias = visit_children visit_If = visit_children visit_Break = visit_children visit_Continue = visit_children visit_Try = visit_children visit_TryFinally = visit_children visit_TryExcept = visit_children visit_withitem = visit_children visit_arguments = visit_children visit_arg = visit_children visit_Return = visit_children visit_Yield = visit_children visit_YieldFrom = visit_children visit_Global = visit_children visit_Module = visit_children visit_Param = visit_children def astFormat(node): return ast.dump(copy.deepcopy(node),annotate_fields=True, include_attributes=True) class __rl_SafeIter__(object): def __init__(self, it, owner): self.__rl_iter__ = owner().__rl_real_iter__(it) self.__rl_owner__ = owner def __iter__(self): return self def __next__(self): self.__rl_owner__().__rl_check__() return next(self.__rl_iter__) next = __next__ # Python 2 compat __rl_safe_builtins__ = {} #constructed below def safer_globals(g=None): if g is None: g = sys._getframe(1).f_globals.copy() for name in ('__annotations__', '__doc__', '__loader__', '__name__', '__package__', '__spec__'): if name in g: del g[name] g['__builtins__'] = __rl_safe_builtins__.copy() return g math_log10 = math.log10 __rl_undef__ = object() class __RL_SAFE_ENV__(object): __time_time__ = time.time __weakref_ref__ = weakref.ref __slicetype__ = type(slice(0)) def __init__(self, timeout=None, allowed_magic_methods=None): self.timeout = timeout if timeout is not None else self.__rl_tmax__ self.allowed_magic_methods = (__allowed_magic_methods__ if allowed_magic_methods==True else allowed_magic_methods) if allowed_magic_methods else [] if isPy3: import builtins self.__rl_gen_range__ = builtins.range else: import __builtin__ as builtins self.__rl_gen_range__ = builtins.xrange self.__rl_real_iter__ = builtins.iter class __rl_dict__(dict): def __new__(cls, *args,**kwds): if len(args)==1 and not isinstance(args[0],dict): try: it = self.__real_iter__(args[0]) except TypeError: pass else: args = (self.__rl_getiter__(it),) return dict.__new__(cls,*args,**kwds) class __rl_missing_func__(object): def __init__(self,name): self.__name__ = name def __call__(self,*args,**kwds): raise BadCode('missing global %s' % self.__name__) self.real_bi = builtins self.bi_replace = ( ('open',__rl_missing_func__('open')), ('iter',self.__rl_getiter__), ) + (( ) if isPy3 else ( ('file',__rl_missing_func__('file')), )) __rl_safe_builtins__.update({_:getattr(builtins,_) for _ in ('''None False True abs bool callable chr complex divmod float hash hex id int isinstance issubclass len oct ord range repr round slice str tuple setattr classmethod staticmethod property divmod next object getattr dict iter pow list type max min sum enumerate zip hasattr filter map any all sorted reversed range set frozenset ArithmeticError AssertionError AttributeError BaseException BufferError BytesWarning DeprecationWarning EOFError EnvironmentError Exception FloatingPointError FutureWarning GeneratorExit IOError ImportError ImportWarning IndentationError IndexError KeyError KeyboardInterrupt LookupError MemoryError NameError NotImplementedError OSError OverflowError PendingDeprecationWarning ReferenceError RuntimeError RuntimeWarning StopIteration SyntaxError SyntaxWarning SystemError SystemExit TabError TypeError UnboundLocalError UnicodeDecodeError UnicodeEncodeError UnicodeError UnicodeTranslateError UnicodeWarning UserWarning ValueError Warning ZeroDivisionError ''' + ('__build_class__' if isPy3 else 'basestring cmp long unichr unicode xrange StandardError reduce apply')).split()}) self.__rl_builtins__ = __rl_builtins__ = {_:__rl_missing_func__(_) for _ in dir(builtins) if callable(getattr(builtins,_))} __rl_builtins__.update(__rl_safe_builtins__) #these are used in the tree visitor __rl_builtins__['__rl_add__'] = self.__rl_add__ __rl_builtins__['__rl_mult__'] = self.__rl_mult__ __rl_builtins__['__rl_pow__'] = self.__rl_pow__ __rl_builtins__['__rl_sd__'] = self.__rl_sd__ __rl_builtins__['__rl_augAssign__'] = self.__rl_augAssign__ __rl_builtins__['__rl_getitem__'] = self.__rl_getitem__ __rl_builtins__['__rl_getattr__'] = self.__rl_getattr__ __rl_builtins__['__rl_getiter__'] = self.__rl_getiter__ __rl_builtins__['__rl_max_len__'] = self.__rl_max_len__ __rl_builtins__['__rl_max_pow_digits__'] = self.__rl_max_pow_digits__ __rl_builtins__['__rl_iter_unpack_sequence__'] = self.__rl_iter_unpack_sequence__ __rl_builtins__['__rl_unpack_sequence__'] = self.__rl_unpack_sequence__ __rl_builtins__['__rl_apply__'] = lambda func,*args,**kwds: self.__rl_apply__(func,args,kwds) __rl_builtins__['__rl_SafeIter__'] = __rl_SafeIter__ #these are tested builtins __rl_builtins__['getattr'] = self.__rl_getattr__ __rl_builtins__['dict'] = __rl_dict__ __rl_builtins__['iter'] = self.__rl_getiter__ __rl_builtins__['pow'] = self.__rl_pow__ __rl_builtins__['list'] = self.__rl_list__ __rl_builtins__['type'] = self.__rl_type__ __rl_builtins__['max'] = self.__rl_max__ __rl_builtins__['min'] = self.__rl_min__ __rl_builtins__['sum'] = self.__rl_sum__ __rl_builtins__['enumerate'] = self.__rl_enumerate__ __rl_builtins__['zip'] = self.__rl_zip__ __rl_builtins__['hasattr'] = self.__rl_hasattr__ __rl_builtins__['filter'] = self.__rl_filter__ __rl_builtins__['map'] = self.__rl_map__ __rl_builtins__['any'] = self.__rl_any__ __rl_builtins__['all'] = self.__rl_all__ __rl_builtins__['sorted'] = self.__rl_sorted__ __rl_builtins__['reversed'] = self.__rl_reversed__ __rl_builtins__['range'] = self.__rl_range__ __rl_builtins__['set'] = self.__rl_set__ __rl_builtins__['frozenset'] = self.__rl_frozenset__ if not isPy3: __rl_builtins__['reduce'] = self.__rl_reduce__ __rl_builtins__['xrange'] = self.__rl_xrange__ __rl_builtins__['apply'] = self.__rl_apply__ def __rl_type__(self,*args): if len(args)==1: return type(*args) raise BadCode('type call error') def __rl_check__(self): if self.__time_time__() >= self.__rl_limit__: raise BadCode('Resources exceeded') def __rl_sd__(self,obj): return obj def __rl_getiter__(self,it): return __rl_SafeIter__(it,owner=self.__weakref_ref__(self)) def __rl_max__(self,arg,*args,**kwds): if args: arg = [arg] arg.extend(args) return max(self.__rl_args_iter__(arg),**kwds) def __rl_min__(self,arg,*args,**kwds): if args: arg = [arg] arg.extend(args) return min(self.__rl_args_iter__(arg),**kwds) def __rl_sum__(self, sequence, start=0): return sum(self.__rl_args_iter__(sequence), start) def __rl_enumerate__(self, seq): return enumerate(self.__rl_args_iter__(seq)) def __rl_zip__(self,*args): return zip(*[self.__rl_args_iter__(self.__rl_getitem__(args, i)) for i in range(len(args))]) def __rl_hasattr__(self, obj, name): try: self.__rl_getattr__(obj, name) except (AttributeError, BadCode, TypeError): return False return True def __rl_filter__(self, f, seq): return filter(f,self.__rl_args_iter__(seq)) def __rl_map__(self, f, seq): return map(f,self.__rl_args_iter__(seq)) def __rl_any__(self, seq): return any(self.__rl_args_iter__(seq)) def __rl_all__(self, seq): return all(self.__rl_args_iter__(seq)) def __rl_sorted__(self, seq, **kwds): return sorted(self.__rl_args_iter__(seq),**kwds) def __rl_reversed__(self, seq): return self.__rl_args_iter__(reversed(seq)) if not isPy3: def __rl_reduce__(self, f, seq, initial=__rl_undef__): if initial is __rl_undef__: return reduce(f, self.__rl_args_iter__(seq)) else: return reduce(f, self.__rl_args_iter__(seq), initial) def __rl_range__(self,start,*args): return list(self.__rl_getiter__(range(start,*args))) def __rl_xrange__(self,start,*args): return self.__rl_getiter__(xrange(start,*args)) else: def __rl_range__(self,start,*args): return self.__rl_getiter__(range(start,*args)) def __rl_set__(self, it): return set(self.__rl_args_iter__(it)) def __rl_frozenset__(self, it): return frozenset(self.__rl_args_iter__(it)) def __rl_iter_unpack_sequence__(self, it, spec, _getiter_): """Protect sequence unpacking of targets in a 'for loop'. The target of a for loop could be a sequence. For example "for a, b in it" => Each object from the iterator needs guarded sequence unpacking. """ # The iteration itself needs to be protected as well. for ob in _getiter_(it): yield self.__rl_unpack_sequence__(ob, spec, _getiter_) def __rl_unpack_sequence__(self, it, spec, _getiter_): """Protect nested sequence unpacking. Protect the unpacking of 'it' by wrapping it with '_getiter_'. Furthermore for each child element, defined by spec, __rl_unpack_sequence__ is called again. Have a look at transformer.py 'gen_unpack_spec' for a more detailed explanation. """ # Do the guarded unpacking of the sequence. ret = list(self.__rl__getiter__(it)) # If the sequence is shorter then expected the interpreter will raise # 'ValueError: need more than X value to unpack' anyway # => No childs are unpacked => nothing to protect. if len(ret) < spec['min_len']: return ret # For all child elements do the guarded unpacking again. for (idx, child_spec) in spec['childs']: ret[idx] = self.__rl_unpack_sequence__(ret[idx], child_spec, _getiter_) return ret def __rl_is_allowed_name__(self, name): """Check names if they are allowed. If ``allow_magic_methods is True`` names in `__allowed_magic_methods__` are additionally allowed although their names start with `_`. """ if isinstance(name,strTypes): if name in __rl_unsafe__ or (name.startswith('__') and name!='__' and name not in self.allowed_magic_methods): raise BadCode('unsafe access of %s' % name) def __rl_getattr__(self, obj, a, *args): if isinstance(obj, strTypes) and a=='format': raise BadCode('%s.format is not implemented' % type(obj)) self.__rl_is_allowed_name__(a) return getattr(obj,a,*args) def __rl_getitem__(self, obj, a): if type(a) is self.__slicetype__: if a.step is not None: v = obj[a] else: start = a.start stop = a.stop if start is None: start = 0 if stop is None: v = obj[start:] else: v = obj[start:stop] return v elif isinstance(a,strTypes): self.__rl_is_allowed_name__(a) return obj[a] return obj[a] __rl_tmax__ = 5 __rl_max_len__ = 100000 __rl_max_pow_digits__ = 100 def __rl_add__(self, a, b): if (hasattr(a, '__len__') and hasattr(b, '__len__') and (len(a) + len(b)) > self.__rl_max_len__): raise BadCode("excessive length") return a + b def __rl_mult__(self, a, b): if ((hasattr(a, '__len__') and b * len(a) > self.__rl_max_len__) or (hasattr(b, '__len__') and a * len(b) > self.__rl_max_len__)): raise BadCode("excessive length") return a * b def __rl_pow__(self, a, b): try: if b>0: if int(b*math_log10(a)+1)>self.__rl_max_pow_digits__: raise BadCode except: raise BadCode('%r**%r invalid or too large' % (a,b)) return a ** b def __rl_augAssign__(self,op,v,i): if op=='+=': return self.__rl_add__(v,i) if op=='-=': return v-i if op=='*=': return self.__rl_mult__(v,i) if op=='/=': return v/i if op=='%=': return v%i if op=='**=': return self.__rl_pow__(v,i) if op=='<<=': return v<<i if op=='>>=': return v>>i if op=='|=': return v|i if op=='^=': return v^i if op=='&=': return v&i if op=='//=': return v//i def __rl_apply__(self, func, args, kwds): obj = getattr(func,'__self__',None) if obj: if isinstance(obj,dict) and func.__name__ in ('pop','setdefault','get', 'popitem'): self.__rl_is_allowed_name__(args[0]) return func(*[a for a in self.__rl_getiter__(args)], **{k:v for k,v in kwds.items()}) def __rl_args_iter__(self,*args): if len(args) == 1: i = args[0] # Don't double-wrap if isinstance(i, __rl_SafeIter__): return i if not isinstance(i,self.__rl_gen_range__): return self.__rl_getiter__(i) return self.__rl_getiter__(iter(*args)) def __rl_list__(self,it): return list(self.__rl_getiter__(it)) def __rl_compile__(self, src, fname='<string>', mode="eval", flags=0, inherit=True, visit=None): names_seen = {} if not visit: bcode = compile(src, fname, mode=mode, flags=flags, dont_inherit=not inherit) else: astc = ast.parse(src, fname, mode) if eval_debug>0: print('pre:\n%s\n'%astFormat(astc)) astc = visit(astc) if eval_debug>0: print('post:\n%s\n'%astFormat(astc)) bcode = compile(astc, fname, mode=mode) return bcode, names_seen def __rl_safe_eval__(self, expr, g, l, mode, timeout=None, allowed_magic_methods=None, __frame_depth__=3): bcode, ns = self.__rl_compile__(expr, fname='<string>', mode=mode, flags=0, inherit=True, visit=UntrustedAstTransformer(nameIsAllowed=self.__rl_is_allowed_name__).visit) if None in (l,g): G = sys._getframe(__frame_depth__) L = G.f_locals.copy() if l is None else l G = G.f_globals.copy() if g is None else g else: G = g L = l obi = (G['__builtins__'],) if '__builtins__' in G else False G['__builtins__'] = self.__rl_builtins__ self.__rl_limit__ = self.__time_time__() + (timeout if timeout is not None else self.timeout) if allowed_magic_methods is not None: self.allowed_magic_methods = ( __allowed_magic_methods__ if allowed_magic_methods==True else allowed_magic_methods) if allowed_magic_methods else [] sbi = [].append bi = self.real_bi bir = self.bi_replace for n, r in bir: sbi(getattr(bi,n)) setattr(bi,n,r) try: return eval(bcode,G,L) finally: sbi = sbi.__self__ for i, (n, r) in enumerate(bir): setattr(bi,n,sbi[i]) if obi: G['__builtins__'] = obi[0] class __rl_safe_eval__(object): '''creates one environment and re-uses it''' mode = 'eval' def __init__(self): self.env = None def __call__(self, expr, g=None, l=None, timeout=None, allowed_magic_methods=None): if not self.env: self.env = __RL_SAFE_ENV__(timeout=timeout, allowed_magic_methods=allowed_magic_methods) return self.env.__rl_safe_eval__(expr, g, l, self.mode, timeout=timeout, allowed_magic_methods=allowed_magic_methods, __frame_depth__=2) class __rl_safe_exec__(__rl_safe_eval__): mode = 'exec' rl_safe_exec = __rl_safe_exec__() rl_safe_eval = __rl_safe_eval__()