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sandbox.cpython-39.pyc
a &gD @ s d Z ddlZddlZddlZddlmZ ddlmZ ddlm Z ddl m Z ddl m Z dd l mZ dd l mZ dd l mZ dd l mZ dd lmZ ddlmZ dZerh dZne Zh dZddhZddhZddhZ ej dde e d efZ e!fZ"e#fZ$z6ddl%m%Z%m&Z& dd l'm'Z' e"e%e&f7 Z"e e'f7 Z W n e(yF Y n0 zdd l)m*Z* e e*f7 Z W n e(yv Y n0 e ej+f7 Z e"ej,f7 Z"e$ej-f7 Z$e e.g d fe"e.g d fe$e.g d fee.g d!ffZ/G d"d# d#ej0Z1d$d% Z2d&d' Z3d(d) Z4d*d+ Z5G d,d- d-eZ6G d.d/ d/e6Z7zdd0l8m9Z9 W n e(yV d1d2 Z9Y n0 G d3d4 d4e:Z;G d5d6 d6e;e Z<G d7d8 d8e;e Z=dS )9zA sandbox layer that ensures unsafe operations cannot be performed. Useful when the template itself comes from an untrusted source. N)deque)update_wrapper) Formatter)EscapeFormatter)Markup )abc)PY2) range_type) string_types) Environment) SecurityErrori > Z func_closureZ func_codeZ func_dictZ func_defaultsZ func_globals> Zim_funcZim_classZim_selfgi_framegi_codecr_framecr_codeag_codeag_frameignorezthe sets module)module)UserDict DictMixin)UserList)Set)addcleardifference_updatediscardpopremovesymmetric_difference_updateupdate)r r popitem setdefaultr! )appendreverseinsertsortextendr ) r$ appendleftr r( extendleftr popleftr rotatec @ s0 e Zd ZdZdd Zdd Zdd Zdd Zd S ) _MagicFormatMappingzThis class implements a dummy wrapper to fix a bug in the Python standard library for string formatting. See https://bugs.python.org/issue13598 for information about why this is necessary. c C s || _ || _d| _d S )Nr )_args_kwargs _last_indexselfargskwargs r5 2/usr/lib/python3.9/site-packages/jinja2/sandbox.py__init__ s z _MagicFormatMapping.__init__c C sN |dkrD| j }| j d7 _ z | j| W S ty: Y n0 t|}| j| S )N r )r0 r. LookupErrorstrr/ )r2 keyidxr5 r5 r6 __getitem__ s z _MagicFormatMapping.__getitem__c C s t | jS N)iterr/ r2 r5 r5 r6 __iter__ s z _MagicFormatMapping.__iter__c C s t | jS r> )lenr/ r@ r5 r5 r6 __len__ s z_MagicFormatMapping.__len__N)__name__ __module__ __qualname____doc__r7 r= rA rC r5 r5 r5 r6 r- ~ s r- c G s$ t | }t|tkr tdt |S )zWA range that can't generate ranges with a length of more than MAX_RANGE items. zDRange too big. The sandbox blocks ranges larger than MAX_RANGE (%d).)r rB MAX_RANGE OverflowError)r3 rngr5 r5 r6 safe_range s rK c C s d| _ | S )znMarks a function or method as unsafe. :: @unsafe def delete(self): pass T)unsafe_callable)fr5 r5 r6 unsafe s rN c C s t | tjr|tv rdS nt | tjr<|tv s6|tv rdS nt | trT|dkrdS nzt | tjtjtj frndS t | tj r|t v rdS nFt tdrt | tj r|tv rdS n"t tdrt | tjr|tv rdS |dS )a Test if the attribute given is an internal python attribute. For example this function returns `True` for the `func_code` attribute of python objects. This is useful if the environment method :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden. >>> from jinja2.sandbox import is_internal_attribute >>> is_internal_attribute(str, "mro") True >>> is_internal_attribute(str, "upper") False Tmro CoroutineTypeAsyncGeneratorType__) isinstancetypes FunctionTypeUNSAFE_FUNCTION_ATTRIBUTES MethodTypeUNSAFE_METHOD_ATTRIBUTEStypeCodeType TracebackType FrameType GeneratorTypeUNSAFE_GENERATOR_ATTRIBUTEShasattrrP UNSAFE_COROUTINE_ATTRIBUTESrQ !UNSAFE_ASYNC_GENERATOR_ATTRIBUTES startswith)objattrr5 r5 r6 is_internal_attribute s. re c C s( t D ] \}}t| |r||v S qdS )a This function checks if an attribute on a builtin mutable object (list, dict, set or deque) would modify it if called. It also supports the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and with Python 2.6 onwards the abstract base classes `MutableSet`, `MutableMapping`, and `MutableSequence`. >>> modifies_known_mutable({}, "clear") True >>> modifies_known_mutable({}, "keys") False >>> modifies_known_mutable([], "append") True >>> modifies_known_mutable([], "index") False If called with an unsupported object (such as unicode) `False` is returned. >>> modifies_known_mutable("foo", "upper") False F) _mutable_specrS )rc rd ZtypespecrN r5 r5 r6 modifies_known_mutable s rg c @ s e Zd ZdZdZejejejej ej ej ej dZ ejejdZe Ze Zdd Zdd Zd d Zd d Zd d Zdd Zdd Zdd Zdd Z dd Z dd Z dS ) SandboxedEnvironmenta The sandboxed environment. It works like the regular environment but tells the compiler to generate sandboxed code. Additionally subclasses of this environment may override the methods that tell the runtime what attributes or functions are safe to access. If the template tries to access insecure code a :exc:`SecurityError` is raised. However also other exceptions may occur during the rendering so the caller has to ensure that all exceptions are caught. T)+-*/z//z**%)ri rj c C s dS )a Called during template compilation with the name of a unary operator to check if it should be intercepted at runtime. If this method returns `True`, :meth:`call_unop` is executed for this unary operator. The default implementation of :meth:`call_unop` will use the :attr:`unop_table` dictionary to perform the operator with the same logic as the builtin one. The following unary operators are interceptable: ``+`` and ``-`` Intercepted calls are always slower than the native operator call, so make sure only to intercept the ones you are interested in. .. versionadded:: 2.6 Fr5 )r2 operatorr5 r5 r6 intercept_unop8 s z#SandboxedEnvironment.intercept_unopc O s> t j| g|R i | t| jd< | j | _| j | _d S )Nrange) r r7 rK globalsdefault_binop_tablecopy binop_tabledefault_unop_table unop_tabler1 r5 r5 r6 r7 I s z SandboxedEnvironment.__init__c C s | dpt|| S )aY The sandboxed environment will call this method to check if the attribute of an object is safe to access. Per default all attributes starting with an underscore are considered private as well as the special attributes of internal python objects as returned by the :func:`is_internal_attribute` function. _)rb re r2 rc rd valuer5 r5 r6 is_safe_attributeO s z&SandboxedEnvironment.is_safe_attributec C s t |ddpt |dd S )a Check if an object is safely callable. Per default a function is considered safe unless the `unsafe_callable` attribute exists and is True. Override this method to alter the behavior, but this won't affect the `unsafe` decorator from this module. rL FZ alters_data)getattr)r2 rc r5 r5 r6 is_safe_callableX s z%SandboxedEnvironment.is_safe_callablec C s | j | ||S )zFor intercepted binary operator calls (:meth:`intercepted_binops`) this function is executed instead of the builtin operator. This can be used to fine tune the behavior of certain operators. .. versionadded:: 2.6 )rt )r2 contextrn leftrightr5 r5 r6 call_binopb s z SandboxedEnvironment.call_binopc C s | j | |S )zFor intercepted unary operator calls (:meth:`intercepted_unops`) this function is executed instead of the builtin operator. This can be used to fine tune the behavior of certain operators. .. versionadded:: 2.6 )rv )r2 r} rn argr5 r5 r6 call_unopk s z SandboxedEnvironment.call_unopc C s z || W S t tfy t|trz t|}W n tyD Y nd0 zt||}W n tyf Y nB0 | |}|dur| Y S | |||r| Y S | || Y S Y n0 | j ||dS )z(Subscribe an object from sandboxed code.Nrc name) TypeErrorr9 rS r r: Exceptionr{ AttributeErrorwrap_str_formatrz unsafe_undefined undefined)r2 rc argumentrd ry fmtr5 r5 r6 getitemt s& z SandboxedEnvironment.getitemc C s zt ||}W n8 tyF z|| W Y S ttfy@ Y n0 Y n60 | |}|dur^|S | |||rp|S | ||S | j||dS )zSubscribe an object from sandboxed code and prefer the attribute. The attribute passed *must* be a bytestring. Nr )r{ r r r9 r rz r r )r2 rc attributery r r5 r5 r6 r{ s z SandboxedEnvironment.getattrc C s | j d||jjf ||tdS )z1Return an undefined object for unsafe attributes.z.access to attribute %r of %r object is unsafe.)r rc exc)r __class__rD r )r2 rc r r5 r5 r6 r s z%SandboxedEnvironment.unsafe_undefinedc s t |tjtjfr |jdvr dS |j t ts4dS t |jdkt tr`t | j d}nt | }|j fdd}t ||S )a If the given value is a ``str.format`` or ``str.format_map`` method, return a new function than handles sandboxing. This is done at access rather than in :meth:`call`, so that calls made without ``call`` are also sandboxed. )format format_mapNr )escapec sL r<|rt dt| dkr0t dt| d| d }d} | |S )Nz'format_map() takes no keyword argumentsr z)format_map() takes exactly one argument (z given)r r5 )r rB )r3 r4 Zf_selfZ is_format_mapZstr_typevformatr5 r6 wrapper s z5SandboxedEnvironment.wrap_str_format.<locals>.wrapper)rS rT rW BuiltinMethodTyperD __self__r: rY r SandboxedEscapeFormatterr SandboxedFormatterr r )r2 ry formatterr r5 r r6 r s" z$SandboxedEnvironment.wrap_str_formatc O s0 | |std|f |j|g|R i |S )z#Call an object from sandboxed code.z%r is not safely callable)r| r call)Z_SandboxedEnvironment__selfZ _SandboxedEnvironment__contextZ_SandboxedEnvironment__objr3 r4 r5 r5 r6 r s zSandboxedEnvironment.callN) rD rE rF rG Z sandboxedrn r submultruedivfloordivpowmodrr posnegru frozensetZintercepted_binopsZintercepted_unopsro r7 rz r| r r r r{ r r r r5 r5 r5 r6 rh s0 $rh c @ s e Zd ZdZdd ZdS ) ImmutableSandboxedEnvironmentzWorks exactly like the regular `SandboxedEnvironment` but does not permit modifications on the builtin mutable objects `list`, `set`, and `dict` by using the :func:`modifies_known_mutable` function. c C s t | |||sdS t|| S )NF)rh rz rg rx r5 r5 r6 rz s z/ImmutableSandboxedEnvironment.is_safe_attributeN)rD rE rF rG rz r5 r5 r5 r6 r s r )formatter_field_name_splitc C s | S r> )Z_formatter_field_name_split) field_namer5 r5 r6 r s r c @ s e Zd Zdd Zdd ZdS )SandboxedFormatterMixinc C s || _ d S r> )_envr2 envr5 r5 r6 r7 s z SandboxedFormatterMixin.__init__c C sR t |\}}| |||}|D ]*\}}|r:| j||}q | j||}q ||fS r> )r Z get_valuer r{ r ) r2 r r3 r4 firstrestrc Zis_attrir5 r5 r6 get_field s z!SandboxedFormatterMixin.get_fieldN)rD rE rF r7 r r5 r5 r5 r6 r s r c @ s e Zd Zdd ZdS )r c C s t | | t| d S r> )r r7 r r r5 r5 r6 r7 s zSandboxedFormatter.__init__NrD rE rF r7 r5 r5 r5 r6 r s r c @ s e Zd Zdd ZdS )r c C s t | | t| | d S r> )r r7 r )r2 r r r5 r5 r6 r7 s z!SandboxedEscapeFormatter.__init__Nr r5 r5 r5 r6 r s r )>rG rn rT warnings collectionsr functoolsr stringr Z markupsafer r Z_compatr r r r Z environmentr exceptionsr rH rV setrX r^ r` ra filterwarningsDeprecationWarningrD Z_mutable_set_typesdictZ_mutable_mapping_typeslistZ_mutable_sequence_typesr r r ImportErrorZsetsr MutableSetMutableMappingMutableSequencer rf Mappingr- rK rN re rg rh r Z_stringr objectr r r r5 r5 r5 r6 <module> s + % _