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#! /usr/libexec/platform-python -EsI
# Authors: Dan Walsh <dwalsh@redhat.com>
# Authors: Thomas Liu <tliu@fedoraproject.org>
# Authors: Josh Cogliati
#
# Copyright (C) 2009,2010 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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; version 2 only
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import os
import stat
import sys
import socket
import random
import fcntl
import shutil
import re
import subprocess
import selinux
import signal
from tempfile import mkdtemp
import pwd
import sepolicy
SEUNSHARE = "/usr/sbin/seunshare"
SANDBOXSH = "/usr/share/sandbox/sandboxX.sh"
PROGNAME = "selinux-sandbox"
try:
import gettext
kwargs = {}
if sys.version_info < (3,):
kwargs['unicode'] = True
gettext.install(PROGNAME,
localedir="/usr/share/locale",
codeset='utf-8',
**kwargs)
except:
try:
import builtins
builtins.__dict__['_'] = str
except ImportError:
import __builtin__
__builtin__.__dict__['_'] = unicode
DEFAULT_WINDOWSIZE = "1000x700"
DEFAULT_TYPE = "sandbox_t"
DEFAULT_X_TYPE = "sandbox_x_t"
SAVE_FILES = {}
random.seed(None)
def sighandler(signum, frame):
signal.signal(signum, signal.SIG_IGN)
os.kill(0, signum)
raise KeyboardInterrupt
def setup_sighandlers():
signal.signal(signal.SIGHUP, sighandler)
signal.signal(signal.SIGQUIT, sighandler)
signal.signal(signal.SIGTERM, sighandler)
def error_exit(msg):
sys.stderr.write("%s: " % sys.argv[0])
sys.stderr.write("%s\n" % msg)
sys.stderr.flush()
sys.exit(1)
def copyfile(file, srcdir, dest):
import re
if file.startswith(srcdir):
dname = os.path.dirname(file)
bname = os.path.basename(file)
if dname == srcdir:
dest = dest + "/" + bname
else:
newdir = re.sub(srcdir, dest, dname)
if not os.path.exists(newdir):
os.makedirs(newdir)
dest = newdir + "/" + bname
try:
if os.path.isdir(file):
shutil.copytree(file, dest)
else:
shutil.copy2(file, dest)
except shutil.Error as elist:
for e in elist.message:
sys.stderr.write(e[2])
SAVE_FILES[file] = (dest, os.path.getmtime(dest))
def savefile(new, orig, X_ind):
copy = False
if(X_ind):
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
dlg = Gtk.MessageDialog(None, 0, Gtk.MessageType.INFO,
Gtk.ButtonsType.YES_NO,
_("Do you want to save changes to '%s' (Y/N): ") % orig)
dlg.set_title(_("Sandbox Message"))
dlg.set_position(Gtk.WindowPosition.MOUSE)
dlg.show_all()
rc = dlg.run()
dlg.destroy()
if rc == Gtk.ResponseType.YES:
copy = True
else:
try:
input = raw_input
except NameError:
pass
ans = input(_("Do you want to save changes to '%s' (y/N): ") % orig)
if(re.match(_("[yY]"), ans)):
copy = True
if(copy):
shutil.copy2(new, orig)
def reserve(level):
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.bind("\0%s" % level)
fcntl.fcntl(sock.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
def get_range():
try:
level = selinux.getcon_raw()[1].split(":")[4]
lowc, highc = level.split(".")
low = int(lowc[1:])
high = int(highc[1:]) + 1
if high - low == 0:
raise IndexError
return low, high
except IndexError:
raise ValueError(_("User account must be setup with an MCS Range"))
def gen_mcs():
low, high = get_range()
level = None
ctr = 0
total = high - low
total = (total * (total - 1)) / 2
while ctr < total:
ctr += 1
i1 = random.randrange(low, high)
i2 = random.randrange(low, high)
if i1 == i2:
continue
if i1 > i2:
tmp = i1
i1 = i2
i2 = tmp
level = "s0:c%d,c%d" % (i1, i2)
try:
reserve(level)
except socket.error:
continue
break
if level:
return level
raise ValueError(_("Failed to find any unused category sets. Consider a larger MCS range for this user."))
def fullpath(cmd):
for i in ["/", "./", "../"]:
if cmd.startswith(i):
return cmd
for i in os.environ["PATH"].split(':'):
f = "%s/%s" % (i, cmd)
if os.access(f, os.X_OK):
return f
return cmd
class Sandbox:
SYSLOG = "/var/log/messages"
def __init__(self):
self.setype = DEFAULT_TYPE
self.__options = None
self.__cmds = None
self.__init_files = []
self.__paths = []
self.__mount = False
self.__level = None
self.__homedir = None
self.__tmpdir = None
def __validate_mount(self):
if self.__options.level:
if not self.__options.homedir or not self.__options.tmpdir:
self.usage(_("Homedir and tempdir required for level mounts"))
if not os.path.exists(SEUNSHARE):
raise ValueError(_("""
%s is required for the action you want to perform.
""") % SEUNSHARE)
def __mount_callback(self, option, opt, value, parser):
self.__mount = True
def __x_callback(self, option, opt, value, parser):
self.__mount = True
setattr(parser.values, option.dest, True)
if not os.path.exists(SEUNSHARE):
raise ValueError(_("""
%s is required for the action you want to perform.
""") % SEUNSHARE)
if not os.path.exists(SANDBOXSH):
raise ValueError(_("""
%s is required for the action you want to perform.
""") % SANDBOXSH)
def __validdir(self, option, opt, value, parser):
if not os.path.isdir(value):
raise IOError("Directory " + value + " not found")
setattr(parser.values, option.dest, value)
self.__mount = True
def __include(self, option, opt, value, parser):
rp = os.path.realpath(os.path.expanduser(value))
if not os.path.exists(rp):
raise IOError(value + " not found")
if rp not in self.__init_files:
self.__init_files.append(rp)
def __includefile(self, option, opt, value, parser):
fd = open(value, "r")
for i in fd.readlines():
try:
self.__include(option, opt, i[:-1], parser)
except IOError as e:
sys.stderr.write(str(e))
except TypeError as e:
sys.stderr.write(str(e))
fd.close()
def __copyfiles(self):
files = self.__init_files + self.__paths
homedir = pwd.getpwuid(os.getuid()).pw_dir
for f in files:
copyfile(f, homedir, self.__homedir)
copyfile(f, "/tmp", self.__tmpdir)
copyfile(f, "/var/tmp", self.__tmpdir)
def __setup_sandboxrc(self, wm="/usr/bin/matchbox-window-manager"):
execfile = self.__homedir + "/.sandboxrc"
fd = open(execfile, "w+")
if self.__options.session:
fd.write("""#!/bin/sh
#TITLE: /etc/gdm/Xsession
/etc/gdm/Xsession
""")
else:
command = self.__paths[0] + " "
for p in self.__paths[1:]:
command += "'%s' " % p
fd.write("""#! /bin/sh
#TITLE: %s
# /usr/bin/test -r ~/.xmodmap && /usr/bin/xmodmap ~/.xmodmap
%s &
WM_PID=$!
if which dbus-run-session >/dev/null 2>&1; then
dbus-run-session -- %s
else
dbus-launch --exit-with-session %s
fi
kill -TERM $WM_PID 2> /dev/null
""" % (command, wm, command, command))
fd.close()
os.chmod(execfile, 0o700)
def usage(self, message=""):
error_exit("%s\n%s" % (self.__parser.usage, message))
def __parse_options(self):
from optparse import OptionParser
types = ""
try:
types = _("""
Policy defines the following types for use with the -t:
\t%s
""") % "\n\t".join(next(sepolicy.info(sepolicy.ATTRIBUTE, "sandbox_type"))['types'])
except StopIteration:
pass
usage = _("""
sandbox [-h] [-l level ] [-[X|M] [-H homedir] [-T tempdir]] [-I includefile ] [-W windowmanager ] [ -w windowsize ] [[-i file ] ...] [ -t type ] command
sandbox [-h] [-l level ] [-[X|M] [-H homedir] [-T tempdir]] [-I includefile ] [-W windowmanager ] [ -w windowsize ] [[-i file ] ...] [ -t type ] -S
%s
""") % types
parser = OptionParser(usage=usage)
parser.disable_interspersed_args()
parser.add_option("-i", "--include",
action="callback", callback=self.__include,
type="string",
help=_("include file in sandbox"))
parser.add_option("-I", "--includefile", action="callback", callback=self.__includefile,
type="string",
help=_("read list of files to include in sandbox from INCLUDEFILE"))
parser.add_option("-t", "--type", dest="setype", action="store", default=None,
help=_("run sandbox with SELinux type"))
parser.add_option("-M", "--mount",
action="callback", callback=self.__mount_callback,
help=_("mount new home and/or tmp directory"))
parser.add_option("-d", "--dpi",
dest="dpi", action="store",
help=_("dots per inch for X display"))
parser.add_option("-S", "--session", action="store_true", dest="session",
default=False, help=_("run complete desktop session within sandbox"))
parser.add_option("-s", "--shred", action="store_true", dest="shred",
default=False, help=_("Shred content before tempory directories are removed"))
parser.add_option("-X", dest="X_ind",
action="callback", callback=self.__x_callback,
default=False, help=_("run X application within a sandbox"))
parser.add_option("-H", "--homedir",
action="callback", callback=self.__validdir,
type="string",
dest="homedir",
help=_("alternate home directory to use for mounting"))
parser.add_option("-T", "--tmpdir", dest="tmpdir",
type="string",
action="callback", callback=self.__validdir,
help=_("alternate /tmp directory to use for mounting"))
parser.add_option("-w", "--windowsize", dest="windowsize",
type="string", default=DEFAULT_WINDOWSIZE,
help="size of the sandbox window")
parser.add_option("-W", "--windowmanager", dest="wm",
type="string",
default="/usr/bin/matchbox-window-manager",
help=_("alternate window manager"))
parser.add_option("-l", "--level", dest="level",
help=_("MCS/MLS level for the sandbox"))
parser.add_option("-C", "--capabilities",
action="store_true", dest="usecaps", default=False,
help="Allow apps requiring capabilities to run within the sandbox.")
self.__parser = parser
self.__options, cmds = parser.parse_args()
if self.__options.X_ind:
self.setype = DEFAULT_X_TYPE
else:
try:
next(sepolicy.info(sepolicy.TYPE, "sandbox_t"))
except StopIteration:
raise ValueError(_("Sandbox Policy is not currently installed.\nYou need to install the selinux-policy-sandbox package in order to run this command"))
if self.__options.setype:
self.setype = self.__options.setype
if self.__mount:
self.__validate_mount()
if self.__options.session:
if not self.__options.setype:
self.setype = selinux.getcon()[1].split(":")[2]
if not self.__options.homedir or not self.__options.tmpdir:
self.usage(_("You must specify a Homedir and tempdir when setting up a session sandbox"))
if len(cmds) > 0:
self.usage(_("Commands are not allowed in a session sandbox"))
self.__options.X_ind = True
self.__homedir = self.__options.homedir
self.__tmpdir = self.__options.tmpdir
else:
if self.__options.level:
self.__homedir = self.__options.homedir
self.__tmpdir = self.__options.tmpdir
if len(cmds) == 0:
self.usage(_("Command required"))
cmds[0] = fullpath(cmds[0])
if not os.access(cmds[0], os.X_OK):
self.usage(_("%s is not an executable") % cmds[0])
self.__cmds = cmds
for f in cmds:
rp = os.path.realpath(f)
if os.path.exists(rp):
self.__paths.append(rp)
else:
self.__paths.append(f)
def __gen_context(self):
if self.__options.level:
level = self.__options.level
else:
level = gen_mcs()
con = selinux.getcon()[1].split(":")
self.__execcon = "%s:%s:%s:%s" % (con[0], con[1], self.setype, level)
self.__filecon = "%s:object_r:sandbox_file_t:%s" % (con[0], level)
def __setup_dir(self):
selinux.setfscreatecon(self.__filecon)
if self.__options.homedir:
self.__homedir = self.__options.homedir
else:
self.__homedir = mkdtemp(dir="/tmp", prefix=".sandbox_home_")
if self.__options.tmpdir:
self.__tmpdir = self.__options.tmpdir
else:
self.__tmpdir = mkdtemp(dir="/tmp", prefix=".sandbox_tmp_")
self.__copyfiles()
selinux.chcon(self.__homedir, self.__filecon, recursive=True)
selinux.chcon(self.__tmpdir, self.__filecon, recursive=True)
selinux.setfscreatecon(None)
def __execute(self):
try:
cmds = [SEUNSHARE, "-Z", self.__execcon]
if self.__options.usecaps:
cmds.append('-C')
if self.__mount:
cmds += ["-t", self.__tmpdir, "-h", self.__homedir]
if self.__options.X_ind:
if self.__options.dpi:
dpi = self.__options.dpi
else:
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
dpi = str(Gtk.Settings.get_default().props.gtk_xft_dpi / 1024)
xmodmapfile = self.__homedir + "/.xmodmap"
xd = open(xmodmapfile, "w")
subprocess.Popen(["/usr/bin/xmodmap", "-pke"], stdout=xd).wait()
xd.close()
self.__setup_sandboxrc(self.__options.wm)
cmds += ["--", SANDBOXSH, self.__options.windowsize, dpi]
else:
cmds += ["--"] + self.__paths
return subprocess.Popen(cmds).wait()
pid = os.fork()
if pid == 0:
rc = os.setsid()
if rc:
return rc
selinux.setexeccon(self.__execcon)
os.execv(self.__cmds[0], self.__cmds)
rc = os.waitpid(pid, 0)
return os.WEXITSTATUS(rc[1])
finally:
for i in self.__paths:
if i not in SAVE_FILES:
continue
(dest, mtime) = SAVE_FILES[i]
if os.path.getmtime(dest) > mtime:
savefile(dest, i, self.__options.X_ind)
if self.__homedir and not self.__options.homedir:
if self.__options.shred:
self.shred(self.__homedir)
shutil.rmtree(self.__homedir)
if self.__tmpdir and not self.__options.tmpdir:
if self.__options.shred:
self.shred(self.__homedir)
shutil.rmtree(self.__tmpdir)
def shred(self, path):
for root, dirs, files in os.walk(path):
for f in files:
dest = root + "/" + f
subprocess.Popen(["/usr/bin/shred", dest]).wait()
def main(self):
try:
self.__parse_options()
self.__gen_context()
if self.__mount:
self.__setup_dir()
return self.__execute()
except KeyboardInterrupt:
sys.exit(0)
if __name__ == '__main__':
setup_sighandlers()
if selinux.is_selinux_enabled() != 1:
error_exit("Requires an SELinux enabled system")
try:
sandbox = Sandbox()
rc = sandbox.main()
except OSError as error:
error_exit(error)
except ValueError as error:
error_exit(error.args[0])
except KeyError as error:
error_exit(_("Invalid value %s") % error.args[0])
except IOError as error:
error_exit(error)
except KeyboardInterrupt:
rc = 0
sys.exit(rc)