Edit File: sandbox.py
import os, sys, tempfile, operator, pkg_resources if os.name == "java": import org.python.modules.posix.PosixModule as _os else: _os = sys.modules[os.name] try: _file = file except NameError: _file = None _open = open from distutils.errors import DistutilsError from pkg_resources import working_set from setuptools.compat import builtins, execfile, reduce __all__ = [ "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup", ] def run_setup(setup_script, args): """Run a distutils setup script, sandboxed in its directory""" old_dir = os.getcwd() save_argv = sys.argv[:] save_path = sys.path[:] setup_dir = os.path.abspath(os.path.dirname(setup_script)) temp_dir = os.path.join(setup_dir,'temp') if not os.path.isdir(temp_dir): os.makedirs(temp_dir) save_tmp = tempfile.tempdir save_modules = sys.modules.copy() pr_state = pkg_resources.__getstate__() try: tempfile.tempdir = temp_dir os.chdir(setup_dir) try: sys.argv[:] = [setup_script]+list(args) sys.path.insert(0, setup_dir) # reset to include setup dir, w/clean callback list working_set.__init__() working_set.callbacks.append(lambda dist:dist.activate()) DirectorySandbox(setup_dir).run( lambda: execfile( "setup.py", {'__file__':setup_script, '__name__':'__main__'} ) ) except SystemExit: v = sys.exc_info()[1] if v.args and v.args[0]: raise # Normal exit, just return finally: pkg_resources.__setstate__(pr_state) sys.modules.update(save_modules) # remove any modules imported within the sandbox del_modules = [ mod_name for mod_name in sys.modules if mod_name not in save_modules # exclude any encodings modules. See #285 and not mod_name.startswith('encodings.') ] list(map(sys.modules.__delitem__, del_modules)) os.chdir(old_dir) sys.path[:] = save_path sys.argv[:] = save_argv tempfile.tempdir = save_tmp class AbstractSandbox: """Wrap 'os' module and 'open()' builtin for virtualizing setup scripts""" _active = False def __init__(self): self._attrs = [ name for name in dir(_os) if not name.startswith('_') and hasattr(self,name) ] def _copy(self, source): for name in self._attrs: setattr(os, name, getattr(source,name)) def run(self, func): """Run 'func' under os sandboxing""" try: self._copy(self) if _file: builtins.file = self._file builtins.open = self._open self._active = True return func() finally: self._active = False if _file: builtins.file = _file builtins.open = _open self._copy(_os) def _mk_dual_path_wrapper(name): original = getattr(_os,name) def wrap(self,src,dst,*args,**kw): if self._active: src,dst = self._remap_pair(name,src,dst,*args,**kw) return original(src,dst,*args,**kw) return wrap for name in ["rename", "link", "symlink"]: if hasattr(_os,name): locals()[name] = _mk_dual_path_wrapper(name) def _mk_single_path_wrapper(name, original=None): original = original or getattr(_os,name) def wrap(self,path,*args,**kw): if self._active: path = self._remap_input(name,path,*args,**kw) return original(path,*args,**kw) return wrap if _file: _file = _mk_single_path_wrapper('file', _file) _open = _mk_single_path_wrapper('open', _open) for name in [ "stat", "listdir", "chdir", "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "lstat", "startfile", "mkfifo", "mknod", "pathconf", "access" ]: if hasattr(_os,name): locals()[name] = _mk_single_path_wrapper(name) def _mk_single_with_return(name): original = getattr(_os,name) def wrap(self,path,*args,**kw): if self._active: path = self._remap_input(name,path,*args,**kw) return self._remap_output(name, original(path,*args,**kw)) return original(path,*args,**kw) return wrap for name in ['readlink', 'tempnam']: if hasattr(_os,name): locals()[name] = _mk_single_with_return(name) def _mk_query(name): original = getattr(_os,name) def wrap(self,*args,**kw): retval = original(*args,**kw) if self._active: return self._remap_output(name, retval) return retval return wrap for name in ['getcwd', 'tmpnam']: if hasattr(_os,name): locals()[name] = _mk_query(name) def _validate_path(self,path): """Called to remap or validate any path, whether input or output""" return path def _remap_input(self,operation,path,*args,**kw): """Called for path inputs""" return self._validate_path(path) def _remap_output(self,operation,path): """Called for path outputs""" return self._validate_path(path) def _remap_pair(self,operation,src,dst,*args,**kw): """Called for path pairs like rename, link, and symlink operations""" return ( self._remap_input(operation+'-from',src,*args,**kw), self._remap_input(operation+'-to',dst,*args,**kw) ) if hasattr(os, 'devnull'): _EXCEPTIONS = [os.devnull,] else: _EXCEPTIONS = [] try: from win32com.client.gencache import GetGeneratePath _EXCEPTIONS.append(GetGeneratePath()) del GetGeneratePath except ImportError: # it appears pywin32 is not installed, so no need to exclude. pass class DirectorySandbox(AbstractSandbox): """Restrict operations to a single subdirectory - pseudo-chroot""" write_ops = dict.fromkeys([ "open", "chmod", "chown", "mkdir", "remove", "unlink", "rmdir", "utime", "lchown", "chroot", "mkfifo", "mknod", "tempnam", ]) def __init__(self, sandbox, exceptions=_EXCEPTIONS): self._sandbox = os.path.normcase(os.path.realpath(sandbox)) self._prefix = os.path.join(self._sandbox,'') self._exceptions = [os.path.normcase(os.path.realpath(path)) for path in exceptions] AbstractSandbox.__init__(self) def _violation(self, operation, *args, **kw): raise SandboxViolation(operation, args, kw) if _file: def _file(self, path, mode='r', *args, **kw): if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path): self._violation("file", path, mode, *args, **kw) return _file(path,mode,*args,**kw) def _open(self, path, mode='r', *args, **kw): if mode not in ('r', 'rt', 'rb', 'rU', 'U') and not self._ok(path): self._violation("open", path, mode, *args, **kw) return _open(path,mode,*args,**kw) def tmpnam(self): self._violation("tmpnam") def _ok(self,path): active = self._active try: self._active = False realpath = os.path.normcase(os.path.realpath(path)) if (self._exempted(realpath) or realpath == self._sandbox or realpath.startswith(self._prefix)): return True finally: self._active = active def _exempted(self, filepath): exception_matches = map(filepath.startswith, self._exceptions) return True in exception_matches def _remap_input(self,operation,path,*args,**kw): """Called for path inputs""" if operation in self.write_ops and not self._ok(path): self._violation(operation, os.path.realpath(path), *args, **kw) return path def _remap_pair(self,operation,src,dst,*args,**kw): """Called for path pairs like rename, link, and symlink operations""" if not self._ok(src) or not self._ok(dst): self._violation(operation, src, dst, *args, **kw) return (src,dst) def open(self, file, flags, mode=0x1FF, *args, **kw): # 0777 """Called for low-level os.open()""" if flags & WRITE_FLAGS and not self._ok(file): self._violation("os.open", file, flags, mode, *args, **kw) return _os.open(file,flags,mode, *args, **kw) WRITE_FLAGS = reduce( operator.or_, [getattr(_os, a, 0) for a in "O_WRONLY O_RDWR O_APPEND O_CREAT O_TRUNC O_TEMPORARY".split()] ) class SandboxViolation(DistutilsError): """A setup script attempted to modify the filesystem outside the sandbox""" def __str__(self): return """SandboxViolation: %s%r %s The package setup script has attempted to modify files on your system that are not within the EasyInstall build area, and has been aborted. This package cannot be safely installed by EasyInstall, and may not support alternate installation locations even if you run its setup script by hand. Please inform the package's author and the EasyInstall maintainers to find out if a fix or workaround is available.""" % self.args #