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| Current File : //usr/lib64/python2.6/rexec.pyc |
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f d � � YZ e i Z e i Z d e i f d � � YZ d � Z e d j o e i 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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Code executed in this restricted environment will only have access to
modules and functions that are deemed safe; you can subclass RExec to
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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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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
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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 | i d � } | | i Ud S( s Execute code within a restricted environment.
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R� N( R8 t __dict__( R t codeR ( ( s /usr/lib64/python2.6/rexec.pyt r_exec3 s c C s | i d � } t | | i � S( sF Evaluate code within a restricted environment.
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R� ( R8 t evalR� ( R R� R ( ( s /usr/lib64/python2.6/rexec.pyt r_eval> s c C s# | i d � } t | | i � d S( sf Execute the Python code in the file in the restricted
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