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selinux: [PATCH 02/15] [src-policy] corenet language and tools

[PATCH 02/15] [src-policy] corenet language and tools

From: Caleb Case <ccase_at_nospam>
Date: Tue Jan 26 2010 - 22:08:08 GMT
To: selinux@tycho.nsa.gov


[corenet Language]

The corenet language is a simple transformation of the Reference Policy corenetwork module consisting of 5 files to a single file format with sections. Each corenetwork file is placed into a corenet section as follows:

<module>.if.in => [interface in]
<module>.if.m4 => [interface m4]
<module>.te.in => [policy in]
<module>.te.m4 => [policy m4]
<module>.fc => [context]

  • These are the only valid section headers.
  • A section begins with a section marker and ends with the next marker encountered or the end of the file.
  • All sections are required.
  • Any text outside of a section is an error.
  • The valid contents of each section are the same as for the separate reference policy files.
  • The standard filename extension is '.corenet'.

[corenet Tool]

The corenet tool can create a corenet module from a Reference Policy corenetwork module.

   Usage: corenet COMMAND -n [FILES] -m [FILES] -c [FILE] MODULE.corenet

   Commands: create create a new corenet extract extract .if.(in,m4), .te.(in,m4), and .fc files from a corenet Options: --version show program's version number and exit -h, --help show this help message and exit -f, --force force overwriting existing files Modes: -n, --in specify 'in' files (interface and policy) -m, --m4 specify 'm4' files (interface and policy) -c FILE, --context=FILE context file Create options: -i FILE, --interface=FILE interface file -p FILE, --policy=FILE policy file

Example:

# corenet create -n -i corenetwork.if.in -p corenetwork.te.in -m -i corenetwork.if.m4 -p corenetwork.if.in -c corenetwork.fc corenetwork.corenet

corenet modules should have the '.corenet' extension. The resulting corenetwork.corenet module looks like this:

   [interface in] ## <summary>Policy controlling access to network objects</summary> ## <required val="true"> ## Contains the initial SIDs for network objects.
<snip>

   [interface m4] # # shiftn(num,list...) #
<snip>

   [policy in]

   policy_module(corenetwork, 1.13.1)

<snip>

   [policy m4] # # shiftn(num,list...) #
<snip>

   [context] /dev/ippp.* -c gen_context(system_u:object_r:ppp_device_t,s0) /dev/ppp -c gen_context(system_u:object_r:ppp_device_t,s0)
<snip>

[corenet HLL Compiler]

The corenetc high level language compiler compiles the the corenet module into a refpol module and extracts the policy version from the policy_module statement.

   Usage: corenetc [OPTIONS] [MODULE]

   Input is read from stdin unless MODULE is provided.    Output is written to stdout unless -o is specified.

   Options: --version show program's version number and exit -h, --help show this help message and exit -f, --force force overwriting existing files -t DIR, --tmp=DIR temporary build directory -o FILE, --output=FILE output file -c BOOL, --cleanup=BOOL cleanup (remove) temporary directory (Default: True)

Example:

# corenetc < corenetwork.corenet > corenetwork.cil 3<> corenetwork.version --- Makefile | 2 +- corenet/COPYING | 504 +++++++++++++++++++++++++++++++++++++++++++ corenet/Makefile | 27 +++ corenet/corenet.conf | 4 + corenet/corenet.py | 17 ++ corenet/corenet/corenet.py | 175 +++++++++++++++ corenet/corenet/corenetc.py | 129 +++++++++++ corenet/corenetc.py | 17 ++ corenet/setup.py | 13 ++ 9 files changed, 887 insertions(+), 1 deletions(-) create mode 100644 corenet/COPYING create mode 100644 corenet/Makefile create mode 100644 corenet/corenet.conf create mode 100755 corenet/corenet.py create mode 100644 corenet/corenet/__init__.py create mode 100644 corenet/corenet/corenet.py create mode 100644 corenet/corenet/corenetc.py create mode 100755 corenet/corenetc.py create mode 100755 corenet/setup.py diff --git a/Makefile b/Makefile index c174327..be2a4ec 100644 --- a/Makefile +++ b/Makefile @@ -1,4 +1,4 @@ -SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils refpol # policy +SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils refpol corenet # policy PYSUBDIRS=libselinux libsemanage ifeq ($(DEBUG),1) diff --git a/corenet/COPYING b/corenet/COPYING new file mode 100644 index 0000000..8add30a --- /dev/null +++ b/corenet/COPYING @@ -0,0 +1,504 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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diff --git a/corenet/corenet.conf b/corenet/corenet.conf new file mode 100644 index 0000000..c68ba26 --- /dev/null +++ b/corenet/corenet.conf @@ -0,0 +1,4 @@ +NAME="Corenetwork" +COMPILER="/usr/bin/corenetc" +EXTENSION="corenet" +FLAGS="" diff --git a/corenet/corenet.py b/corenet/corenet.py new file mode 100755 index 0000000..8c6b1f4 --- /dev/null +++ b/corenet/corenet.py @@ -0,0 +1,17 @@ +#!/usr/bin/python + +# Authors: Caleb Case <ccase@tresys.com> +# +# Copyright (C) 2009-2010 Tresys Technology, LLC +# This program is free software; you can redistribute it and/or modify +# it under the terms of the Lesser GNU General Public License as +# published by the Free Software Foundation, version 2. + +import corenet.corenet +import sys + +try: + corenet.corenet.main() +except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/corenet/corenet/__init__.py b/corenet/corenet/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/corenet/corenet/corenet.py b/corenet/corenet/corenet.py new file mode 100644 index 0000000..266861b --- /dev/null +++ b/corenet/corenet/corenet.py @@ -0,0 +1,175 @@ +#!/usr/bin/python + +# Authors: Caleb Case <ccase@tresys.com> +# +# Copyright (C) 2009-2010 Tresys Technology, LLC +# This program is free software; you can redistribute it and/or modify +# it under the terms of the Lesser GNU General Public License as +# published by the Free Software Foundation, version 2. + +from optparse import OptionParser, OptionGroup +import os.path +import re +from refpol import refpol +import sys + +force = False + +def itf_to_corenet(if_in_p, if_m4_p, te_in_p, te_m4_p, fc_p, corenet_p): + refpol.file_exists(corenet_p) + + sections = [ + ("[interface in]", if_in_p), + ("[interface m4]", if_m4_p), + ("[policy in]", te_in_p), + ("[policy m4]", te_m4_p), + ("[context]", fc_p), + ] + + with open(corenet_p, 'w') as out: + for (section, path) in sections: + with open(path, 'r') as f: + out.write("\n" + section + "\n") + out.write(f.read()) + +def corenet_to_itf(corenet_p, if_in_p, if_m4_p, te_in_p, te_m4_p, fc_p): + verify_corenet(corenet_p) + + output = None + + sections = { + "[interface in]" : if_in_p, + "[interface m4]" : if_m4_p, + "[policy in]" : te_in_p, + "[policy m4]" : te_m4_p, + "[context]" : fc_p, + } + + try: + with open(corenet_p, 'r') as input: + for line in input: + if line.strip() in sections: + if output is not None: + output.close() + refpol.file_exists(sections[line.strip()]) + output = open(sections[line.strip()], 'w') + else: + if output is None and line.strip() == "": + # ignore blank lines before first section + continue + output.write(line) + finally: + if output is not None: + output.close() + +def verify_corenet(corenet): + sections = { + "[interface in]" : False, + "[interface m4]" : False, + "[policy in]" : False, + "[policy m4]" : False, + "[context]" : False, + } + + pattern = re.compile("\s*policy_module\((?P<name>\w+),\s*(?P<version>[0-9.]+)\).*") + result = None + + if isinstance(corenet, str): + with open(corenet, 'r') as input: + return verify_corenet(input) + + lineno = 0 + for line in corenet: + lineno = lineno + 1 + section = line.strip() + + if section == "": + # ignore blank lines + pass + elif section in sections: + if sections[section] is True: + raise Exception("Too many %s sections (%s:%d)." % (section, corenet.name, lineno)) + sections[section] = True + else: + if not any(sections.values()): + raise Exception("Invalid data outside section at line %s:%d: %s" % (corenet.name, lineno, line)) + + mod = pattern.match(line) + if mod: + result = { "name" : mod.group("name"), + "version" : mod.group("version") } + if not result: + raise Exception("Failed to discover module name and version. policy_module statement missing?") + + return result + +def verify_ext(corenet_p): + ext = corenet_p.rsplit('.', 1)[1] + if ext != "corenet": + raise Exception("Invalid corenet file extension %s on %s." % (ext, corenet_p)) + +usage = """%prog COMMAND -n [FILES] -m [FILES] -c [FILE] MODULE.corenet + +Commands: + create create a new corenet + extract extract .if.(in,m4), .te.(in,m4), and .fc files from a corenet""" + +version = "%prog 1.0" + +def main(): + def create(option, opt_str, value, parser, *args, **kwargs): + if opt_str in ["-i", "--interface"]: + if parser.values.mode == "in": + parser.values.if_in_p = value + elif parser.values.mode == "m4": + parser.values.if_m4_p = value + else: + raise Exception("Invalid mode: %s" % parser.values.mode) + elif opt_str in ["-p", "--policy"]: + if parser.values.mode == "in": + parser.values.te_in_p = value + elif parser.values.mode == "m4": + parser.values.te_m4_p = value + else: + raise Exception("Invalid mode: %s" % parser.values.mode) + else: + raise Exception("Invalid file selector: %s" % option) + + parser = OptionParser(usage = usage, version = version) + parser.add_option("-f", "--force", action = "store_true", default = False, dest = "force", help = "force overwriting existing files") + + modes = OptionGroup(parser, "Modes") + modes.add_option("-n", "--in", action = "store_const", const = "in", dest = "mode", help = "specify 'in' files (interface and policy)") + modes.add_option("-m", "--m4", action = "store_const", const = "m4", dest = "mode", help = "specify 'm4' files (interface and policy)") + modes.add_option("-c", "--context", action = "store", default = None, dest = "fc_p", help = "context file", metavar = "FILE") + parser.add_option_group(modes) + + create_options = OptionGroup(parser, "Create options") + create_options.add_option("-i", "--interface", action = "callback", callback = create, type = "string", help = "interface file", metavar = "FILE") + create_options.add_option("-p", "--policy", action = "callback", callback = create, type = "string", help = "policy file", metavar = "FILE") + parser.add_option_group(create_options) + + (options, args) = parser.parse_args() + if len(args) != 2: + parser.error("Invalid number of arguments %d." % len(args)) + + force = options.force + refpol.force = options.force + + verify_ext(args[1]) + + command = args[0] + if command == "create": + itf_to_corenet(options.if_in_p, options.if_m4_p, options.te_in_p, options.te_m4_p, options.fc_p, args[1]) + elif command == "extract": + module = args[1].rsplit('.', 1)[0] + corenet_to_itf(args[1], module + ".if.in", module + ".if.m4", module + ".te.in", module + ".te.m4", module + ".fc") + else: + parser.error("Invalid command %s." % command) + +if __name__ == '__main__': + try: + main() + except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/corenet/corenet/corenetc.py b/corenet/corenet/corenetc.py new file mode 100644 index 0000000..f707590 --- /dev/null +++ b/corenet/corenet/corenetc.py @@ -0,0 +1,129 @@ +#!/usr/bin/python + +# Authors: Caleb Case <ccase@tresys.com> +# +# Copyright (C) 2009-2010 Tresys Technology, LLC +# This program is free software; you can redistribute it and/or modify +# it under the terms of the Lesser GNU General Public License as +# published by the Free Software Foundation, version 2. + +import corenet +from optparse import OptionParser, OptionGroup +import os +import os.path +import tempfile +from refpol import refpol +import shutil +import subprocess +import sys + +def to_bool(str): + return { + "true" : True, + "t" : True, + "1" : True, + "false" : False, + "f" : False, + "0" : False, + }[str.lower()] + +usage = """%prog [OPTIONS] [MODULE] + +Input is read from stdin unless MODULE is provided. +Output is written to stdout unless -o is specified.""" + +version = "%prog 1.0" + +def main(): + # create cmdline parser + parser = OptionParser(usage = usage, version = version) + parser.add_option("-f", "--force", action = "store_true", default = False, dest = "force", help = "force overwriting existing files") + parser.add_option("-t", "--tmp", action = "store", default = None, dest = "tmp", help = "temporary build directory", metavar = "DIR") + parser.add_option("-o", "--output", action = "store", default = None, dest = "output", help = "output file", metavar = "FILE") + parser.add_option("-c", "--cleanup", action = "store", default = "True", dest = "cleanup", help = "cleanup (remove) temporary directory (Default: True)", metavar = "BOOL") + + # parse cmdline + (options, args) = parser.parse_args() + options.input = sys.stdin + + if len(args) > 1: + parser.error("Invalid number of arguments %d." % len(args)) + elif len(args) == 1: + options.input = open(args[0]) + + # save the working directory + saved_cwd = os.getcwd() + + force = options.force + refpol.force = options.force + + if options.output is None: + options.output = sys.stdout + else: + refpol.file_exists(options.output) + options.output = open(options.output, "w") + + try: + if not options.tmp: + # create tmp build dir if one isn't provided + options.tmp = tempfile.mkdtemp("-corenetc") + else: + shutil.rmtree(options.tmp, ignore_errors = True) + os.mkdir(options.tmp) + + os.chdir(options.tmp) + + with open("input.corenet", "w") as input: + shutil.copyfileobj(options.input, input) + + with open("input.corenet", "r") as input: + # verify corenet (and write out version) + mod = corenet.verify_corenet(input) + + with os.fdopen(3, "w") as ver: + ver.write(mod["version"]); + + # unpack corenet + corenet.corenet_to_itf("input.corenet", + "input.if", + "input.if.m4", + "input.te.in", + "input.te.m4", + "input.fc") + + # make corenet if + p = subprocess.Popen("egrep '^[[:blank:]]*network_(interface|node|port|packet)(_controlled)?\(.*\)' input.te.in | m4 input.if.m4 - | sed -e 's/dollarsone/\$1/g' -e 's/dollarszero/\$0/g'", shell = True, stdout = open("input.if", "a"), stderr = subprocess.PIPE, close_fds = True) + (stdout, stderr) = p.communicate() + sys.stderr.write(stderr) + if p.returncode != 0: + raise Exception("Failed to compile corenet module if (%d)." % p.returncode) + + # make corenet te + p = subprocess.Popen("m4 input.te.m4 input.te.in | sed -e 's/dollarsone/\$1/g' -e 's/dollarszero/\$0/g'", shell = True, stdout = open("input.te", "w"), stderr = subprocess.PIPE, close_fds = True) + (stdout, stderr) = p.communicate() + sys.stderr.write(stderr) + if p.returncode != 0: + raise Exception("Failed to compile corenet module te (%d)." % p.returncode) + + # combine into a refpol + refpol.itf_to_ref("input.if", "input.te", "input.fc", "input.ref") + + with open("input.ref", "r") as input: + shutil.copyfileobj(input, options.output) + + finally: + if to_bool(options.cleanup): + shutil.rmtree(options.tmp) + + options.input.close() + options.output.close() + + # return the saved directory + os.chdir(saved_cwd) + +if __name__ == '__main__': + try: + main() + except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/corenet/corenetc.py b/corenet/corenetc.py new file mode 100755 index 0000000..2afb4c5 --- /dev/null +++ b/corenet/corenetc.py @@ -0,0 +1,17 @@ +#!/usr/bin/python + +# Authors: Caleb Case <ccase@tresys.com> +# +# Copyright (C) 2009-2010 Tresys Technology, LLC +# This program is free software; you can redistribute it and/or modify +# it under the terms of the Lesser GNU General Public License as +# published by the Free Software Foundation, version 2. + +import corenet.corenetc +import sys + +try: + corenet.corenetc.main() +except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/corenet/setup.py b/corenet/setup.py new file mode 100755 index 0000000..11b2b98 --- /dev/null +++ b/corenet/setup.py @@ -0,0 +1,13 @@ +#!/usr/bin/python + +from distutils.core import setup + +setup( name = "corenet", + version = "0.1", + description = "Corenet Tool", +# url = "", + author = "Caleb Case", + author_email = "ccase@tresys.com", + license = "LGPL v2.1", + packages = ['corenet'], + ) -- 1.6.3.3 -- This message was distributed to subscribers of the selinux mailing list. 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