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f d � � YZ e j Z e j Z d e j f d � � YZ d � Z e d k r e j e � � n d S( s9 Restricted execution facilities.
The class RExec exports methods r_exec(), r_eval(), r_execfile(), and
r_import(), which correspond roughly to the built-in operations
exec, eval(), execfile() and import, but executing the code in an
environment that only exposes those built-in operations that are
deemed safe. To this end, a modest collection of 'fake' modules is
created which mimics the standard modules by the same names. It is a
policy decision which built-in modules and operations are made
available; this module provides a reasonable default, but derived
classes can change the policies e.g. by overriding or extending class
variables like ok_builtin_modules or methods like make_sys().
XXX To do:
- r_open should allow writing tmp dir
- r_exec etc. with explicit globals/locals? (Use rexec("exec ... in ...")?)
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| j j S( N( R' t modules( R ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt modules_dicto s c C s | j j d j S( Nt sys( R' R: t path( R ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt default_pathr s ( R R R R* R+ R, R/ R1 R3 R4 R5 R6 R9 R; R> ( ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyR C s c B s� e Z d Z e e j � Z dX Z dY Z dZ Z d[ Z
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f Z d\ d3 d4 � Z d5 � Z d6 � Z d7 � Z d8 � Z d9 � Z d: � Z d; � Z d< � Z d= � Z d> � Z d? � Z d@ � Z dA � Z dB � Z dC � Z dD � Z i i g dE � Z! dF � Z" dG � Z# dH � Z$ dI � Z% dJ � Z& dK � Z' dL � Z( d] i dM � Z) dN � Z* dO � Z+ dP � Z, dQ � Z- dR � Z. dS � Z/ dT dU dV � Z0 dW � Z1 RS(^ s� Basic restricted execution framework.
Code executed in this restricted environment will only have access to
modules and functions that are deemed safe; you can subclass RExec to
add or remove capabilities as desired.
The RExec class can prevent code from performing unsafe operations like
reading or writing disk files, or using TCP/IP sockets. However, it does
not protect against code using extremely large amounts of memory or
processor time.
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| � | _ | j � | j � | j � | j � t | j | � | _ t | j | � | _ d S( s� Returns an instance of the RExec class.
The hooks parameter is an instance of the RHooks class or a subclass
of it. If it is omitted or None, the default RHooks class is
instantiated.
Whenever the RExec module searches for a module (even a built-in one)
or reads a module's code, it doesn't actually go out to the file
system itself. Rather, it calls methods of an RHooks instance that
was passed to or created by its constructor. (Actually, the RExec
object doesn't make these calls --- they are made by a module loader
object that's part of the RExec object. This allows another level of
flexibility, which can be useful when changing the mechanics of
import within the restricted environment.)
By providing an alternate RHooks object, we can control the file
system accesses made to import a module, without changing the
actual algorithm that controls the order in which those accesses are
made. For instance, we could substitute an RHooks object that
passes all filesystem requests to a file server elsewhere, via some
RPC mechanism such as ILU. Grail's applet loader uses this to support
importing applets from a URL for a directory.
If the verbose parameter is true, additional debugging output may be
sent to standard output.
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c B s | j d � } | | j Ud S( s Execute code within a restricted environment.
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lines of Python code, or a compiled code object, which will be
executed in the restricted environment's __main__ module.
R� N( R9 t __dict__( R t codeR ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt r_exec3 s c C s | j d � } t | | j � S( sF Evaluate code within a restricted environment.
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the restricted environment's __main__ module. The value of the
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R� ( R9 t evalR� ( R R� R ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt r_eval> s c C s# | j d � } t | | j � d S( sf Execute the Python code in the file in the restricted
environment's __main__ module.
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r_execfileJ s c C s | j j | | | | � S( s= Import a module, raising an ImportError exception if the module
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import_module( R R� t globalst localst fromlist( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyR� R s c C s | j j | � S( s Reload the module object, re-parsing and re-initializing it.
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( R~ Rn ( R R ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyR� ] s c C s | j j | � S( s@ Unload the module.
Removes it from the restricted environment's sys.modules dictionary.
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c G s | j | j | � S( s� Execute code within a restricted environment.
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( R� R� ( R R( ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt s_exec� s c G s | j | j | � S( s� Evaluate code within a restricted environment.
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sys.stderr, and sys.stdout.
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s_execfile� s c G s | j | j | � S( s� Import a module, raising an ImportError exception if the module
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sys.stdout.
( R� R� ( R R( ( ( s* /opt/alt/python27/lib64/python2.7/rexec.pyt s_unload� s R� i����c C s4 t | � } | d k r$ t d � n t | | | � S( sG Method called when open() is called in the restricted environment.
The arguments are identical to those of the open() function, and a
file object (or a class instance compatible with file objects)
should be returned. RExec's default behaviour is allow opening
any file for reading, but forbidding any attempt to write a file.
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