~azzar1/unity/add-show-desktop-key

#!/usr/bin/python

# IVLE

# Copyright (C) 2007-2008 The University of Melbourne

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

# CGI Trampoline

# Author: Tom Conway

# Date: 13/12/2007

# Usage: trampoline.py <uid> <jail-dir> <cwd-within-jail> <script-name>

#   <uid>       The user id of the user to do the evaluation

#               At the moment this is the user-name, but it would be

#               nice if it were made to be the numeric uid, since the

#               trampoline has to read /etc/passwd to figure this out

#               at the moment. OTOH, the server invoking the trampoline

#               may know it already, and in any case can cache it between

#               requests, which the trampoline cannot.

#   <jail-dir>  The directory that the trampoline should chroot to

#   <cwd-within-jail> The directory within the jail that should be

#               made the current working directory for the script.

#               This should be relative to / within the jail.

#   <script-name> The path (within the jail) to the script to be executed.

import os

import sys

import re

import resource

def throttle():

    Kb = 1024

    Mb = 1024 * 1024

    limits = [(resource.RLIMIT_CORE,     (0,0)), \

              (resource.RLIMIT_CPU,      (1,2)), \

              (resource.RLIMIT_FSIZE,    (5 * Mb, 5 * Mb)), \

              (resource.RLIMIT_DATA,     (20 * Mb, 24 * Mb)), \

              (resource.RLIMIT_STACK,    (8 * Mb, 9 * Mb)), \

              (resource.RLIMIT_NPROC,    (10, 10)), \

              (resource.RLIMIT_NOFILE,   (10, 12))]

    for (r,l) in limits:

        resource.setrlimit(r,l)

def runscript(uid, jail, cwd, script):

    if uid == 0:

        sys.exit(sys.argv[0] + ": cannot run scripts as root!\n")

    # os.chroot(os.path.join(<<base-directory-for-jails>>, jail))

    os.chroot(jail)

    os.chdir(cwd)

    os.setuid(uid)

    throttle()

    m = compile(file(script,'r').read(), script, 'exec')

    g = {}

    g['__builtins__'] = globals()['__builtins__']

    g['__file__'] = script

    g['__name__'] = '__main__'

    eval(m, g, {})

    #eval(m)

    sys.exit(0)

runscript(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])