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# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2006 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
#
"""
Utilities for dealing with the compilation of modules and creation
of module tress.
"""
import re
import tempfile
try:
from subprocess import getstatusoutput
except ImportError:
from commands import getstatusoutput
import os
import os.path
import shutil
import selinux
from . import defaults
def is_valid_name(modname):
"""Check that a module name is valid.
"""
m = re.findall("[^a-zA-Z0-9_\-\.]", modname)
if len(m) == 0 and modname[0].isalpha():
return True
else:
return False
class ModuleTree:
def __init__(self, modname):
self.modname = modname
self.dirname = None
def dir_name(self):
return self.dirname
def te_name(self):
return self.dirname + "/" + self.modname + ".te"
def fc_name(self):
return self.dirname + "/" + self.modname + ".fc"
def if_name(self):
return self.dirname + "/" + self.modname + ".if"
def package_name(self):
return self.dirname + "/" + self.modname + ".pp"
def makefile_name(self):
return self.dirname + "/Makefile"
def create(self, parent_dirname, makefile_include=None):
self.dirname = parent_dirname + "/" + self.modname
os.mkdir(self.dirname)
fd = open(self.makefile_name(), "w")
if makefile_include:
fd.write("include " + makefile_include)
else:
fd.write("include " + defaults.refpolicy_makefile())
fd.close()
# Create empty files for the standard refpolicy
# module files
open(self.te_name(), "w").close()
open(self.fc_name(), "w").close()
open(self.if_name(), "w").close()
def modname_from_sourcename(sourcename):
return os.path.splitext(os.path.split(sourcename)[1])[0]
class ModuleCompiler:
"""ModuleCompiler eases running of the module compiler.
The ModuleCompiler class encapsulates running the commandline
module compiler (checkmodule) and module packager (semodule_package).
You are likely interested in the create_module_package method.
Several options are controlled via paramaters (only effects the
non-refpol builds):
.mls [boolean] Generate an MLS module (by passed -M to
checkmodule). True to generate an MLS module, false
otherwise.
.module [boolean] Generate a module instead of a base module.
True to generate a module, false to generate a base.
.checkmodule [string] Fully qualified path to the module compiler.
Default is /usr/bin/checkmodule.
.semodule_package [string] Fully qualified path to the module
packager. Defaults to /usr/bin/semodule_package.
.output [file object] File object used to write verbose
output of the compililation and packaging process.
"""
def __init__(self, output=None):
"""Create a ModuleCompiler instance, optionally with an
output file object for verbose output of the compilation process.
"""
self.mls = selinux.is_selinux_mls_enabled()
self.module = True
self.checkmodule = "/usr/bin/checkmodule"
self.semodule_package = "/usr/bin/semodule_package"
self.output = output
self.last_output = ""
self.refpol_makefile = defaults.refpolicy_makefile()
self.make = "/usr/bin/make"
def o(self, str):
if self.output:
self.output.write(str + "\n")
self.last_output = str
def run(self, command):
self.o(command)
rc, output = getstatusoutput(command)
self.o(output)
return rc
def gen_filenames(self, sourcename):
"""Generate the module and policy package filenames from
a source file name. The source file must be in the form
of "foo.te". This will generate "foo.mod" and "foo.pp".
Returns a tuple with (modname, policypackage).
"""
splitname = sourcename.split(".")
if len(splitname) < 2:
raise RuntimeError("invalid sourcefile name %s (must end in .te)", sourcename)
# Handle other periods in the filename correctly
basename = ".".join(splitname[0:-1])
modname = basename + ".mod"
packagename = basename + ".pp"
return (modname, packagename)
def create_module_package(self, sourcename, refpolicy=True):
"""Create a module package saved in a packagename from a
sourcename.
The create_module_package creates a module package saved in a
file named sourcename (.pp is the standard extension) from a
source file (.te is the standard extension). The source file
should contain SELinux policy statements appropriate for a
base or non-base module (depending on the setting of .module).
Only file names are accepted, not open file objects or
descriptors because the command line SELinux tools are used.
On error a RuntimeError will be raised with a descriptive
error message.
"""
if refpolicy:
self.refpol_build(sourcename)
else:
modname, packagename = self.gen_filenames(sourcename)
self.compile(sourcename, modname)
self.package(modname, packagename)
os.unlink(modname)
def refpol_build(self, sourcename):
# Compile
command = self.make + " -f " + self.refpol_makefile
rc = self.run(command)
# Raise an error if the process failed
if rc != 0:
raise RuntimeError("compilation failed:\n%s" % self.last_output)
def compile(self, sourcename, modname):
s = [self.checkmodule]
if self.mls:
s.append("-M")
if self.module:
s.append("-m")
s.append("-o")
s.append(modname)
s.append(sourcename)
rc = self.run(" ".join(s))
if rc != 0:
raise RuntimeError("compilation failed:\n%s" % self.last_output)
def package(self, modname, packagename):
s = [self.semodule_package]
s.append("-o")
s.append(packagename)
s.append("-m")
s.append(modname)
rc = self.run(" ".join(s))
if rc != 0:
raise RuntimeError("packaging failed [%s]" % self.last_output)