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selinux: Re: [PATCH 04/15] [src-policy] refpol intermediate lang

Re: [PATCH 04/15] [src-policy] refpol intermediate language compiler (refpol_ilc)

From: James Carter <jwcart2_at_nospam>
Date: Thu Jan 28 2010 - 21:03:18 GMT
To: Caleb Case <ccase@tresys.com>


On Tue, 2010-01-26 at 17:08 -0500, Caleb Case wrote:
> In the interim, before the completion of the proposed CIL[1], the
> intermediate language will be a specialized version of refpol and the
> Reference Policy build environment.
>
> [refpol_ilc CIL Compiler]
>
> The repfol intermediate language compiler (refpol_ilc) builds a binary
> base module from refpol module. Producing a binary base module allows
> the existing libsemanage framework to continue to operate essentially as
> it does today (load base module, apply database changes, create loadable
> policy).
>
> Usage: refpol_ilc [OPTIONS] MODULE MODULE ...
>
> Options:
> --version show program's version number and exit
> -h, --help show this help message and exit
> -d FILE, --disabled=FILE
> indicates module is disabled
> -f, --force force overwriting existing files
> -t DIR, --tmp=DIR temporary build directory
> -b DIR, --build-template=DIR
> build template directory (Default:
> /usr/share/selinux/refpol_ilc/build)
> -o FILE, --output=FILE
> output file
> -c BOOL, --cleanup=BOOL
> cleanup (remove) temporary directory (Default: True)
>
> Note: The paths passed to the refpol_ilc need to be in the format of the
> semanage store in /var/lib/selinux. The refpol_ilc extracts the
> module name from the path. Future CIL will also likely extract the
> priority of the module from the path.
>
> Example:
>
> The compiles the moduless installed in the 'test' store into a base.pp:
>
> # refpol_ilc `find /var/lib/selinux/test/active/modules/400/ -iname cil` > base.pp
>
> [Compilation]
>
> Compilation proceeds as follows:
>
> 1. Copy build environment to temporary location.
>
> Note: refpol_ilc anticipates the build environment being installed
> to /usr/share/selinux/refpol_ilc/build by default.
>
> 2. Install modules (see Special Modules and Normal Modules below).
>
> 3. Create conf files.
>
> 4. Set all modules to base or off as appropriate in modules.conf.
>
> 5. Create base module (base.pp).
>
> [Special Modules]
>
> A number of modules are considered to be special and are installed into
> special locations in the build environment:
>
> [Module Name] [Reference Policy File]
>
> _constraints policy/constraints
> _global_booleans policy/global_booleans
> _global_tunables policy/global_tunables
> _mcs policy/mcs
> _mls policy/mls
> _policy_capabilities policy/policy_capabilities
> _rolemap policy/rolemap
> _users policy/users
> _access_vectors policy/flask/access_vectors
> _initial_sids policy/flask/initial_sids
> _security_classes policy/flask/security_classes
> _file_patterns policy/support/file_patterns.spt
> _ipc_patterns policy/support/ipc_patterns.spt
> _loadable_module policy/support/loadable_module.spt
> _misc_macros policy/support/misc_macros.spt
> _misc_patterns policy/support/misc_patterns.spt
> _mls_mcs_macros policy/support/mls_mcs_macros.spt
> _obj_perm_sets policy/support/obj_perm_sets.spt
>

In the policy store, mcs and mls modules exist along with _mcs and _mls modules. But _mcs calls itself "mcs" in the policy_module statement and _mls calls itself "mls" in the policy_module statement.

mcs:
policy_module(mcs, 1.2.0)

_mcs:
policy_module(mcs, 2.20091117)

mls:
policy_module(mls, 1.8.0)

_mls:
policy_module(mls, 2.20091117)

Is there a reason for this?

> The build.conf file is handled with another special module _defines.
> This module provides some of the variables for the traditional
> build.conf with the remaining variables determined by the build
> environment as follows:
>
> OUTPUT_POLICY => Copied from _defines.
> TYPE => Detect from the presence of the mls/mcs modules.
> mls > mcs > none: meaning that if there is an
> _mls module, then TYPE = mls, even if there is an
> mcs module present.
> NAME => Copied from _defines.
> DISTRO => Copied from _defines.
> UNK_PERMS => Copied from _defines.
> DIRECT_INITRC => Copied from _defines.
> MONOLITHIC => Fixed to 'n'.
> UBAC => Copied from _defines.
> MLS_SENS => Copied from _defines.
> MLS_CATS => Copied from _defines.
> MCS_CATS => Copied from _defines.
> QUIET => Copied from _defines.
>
> No other special modules are permitted. All special modules are
> prepended with '_' to distinguish them from normal modules.
>
> Note: The MLS/MCS/Standard setting of the policy is derived from the
> presense of the _mls or _mcs modules. It is no longer necessary to
> specify the policy type explicitly via the TYPE statement. This
> also allows policy type to be switched simply by enabling/disabled
> the _mls/_mcs modules.
>
> [Normal Modules]
>
> All normal (non-special) modules are copied to policy/modules/kernel/
> and unpacked into the Reference Policy module 3 file format.
>
> [1] CIL RFC: http://marc.info/?l=selinux&m=124759244409438&w=2
> ---
> Makefile | 2 +-
> refpol_ilc/COPYING | 504 +++++++++++++++++++++++++++++++++++
> refpol_ilc/Makefile | 24 ++
> refpol_ilc/refpol_ilc.py | 17 ++
> refpol_ilc/refpol_ilc/refpol_ilc.py | 193 +++++++++++++
> refpol_ilc/setup.py | 13 +
> 6 files changed, 752 insertions(+), 1 deletions(-)
> create mode 100644 refpol_ilc/COPYING
> create mode 100644 refpol_ilc/Makefile
> create mode 100755 refpol_ilc/refpol_ilc.py
> create mode 100644 refpol_ilc/refpol_ilc/__init__.py
> create mode 100644 refpol_ilc/refpol_ilc/refpol_ilc.py
> create mode 100755 refpol_ilc/setup.py
>
> diff --git a/Makefile b/Makefile
> index be2a4ec..afb4843 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1,4 +1,4 @@
> -SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils refpol corenet # policy
> +SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils refpol corenet refpol_ilc # policy
> PYSUBDIRS=libselinux libsemanage
>
> ifeq ($(DEBUG),1)
> diff --git a/refpol_ilc/COPYING b/refpol_ilc/COPYING
> new file mode 100644
> index 0000000..8add30a
> --- /dev/null
> +++ b/refpol_ilc/COPYING
> @@ -0,0 +1,504 @@
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> +
> diff --git a/refpol_ilc/Makefile b/refpol_ilc/Makefile
> new file mode 100644
> index 0000000..f6cdb14
> --- /dev/null
> +++ b/refpol_ilc/Makefile
> @@ -0,0 +1,24 @@
> +PREFIX ?= $(DESTDIR)/usr
> +BINDIR ?= $(PREFIX)/bin
> +
> +PYTHON ?= python
> +
> +ifneq ($(origin DESTDIR), undefined)
> + PYDESTDIR ?= --root=$(DESTDIR)
> +endif
> +
> +TARGET = refpol_ilc.py
> +
> +all:
> + $(PYTHON) setup.py build
> +
> +install:
> + $(PYTHON) setup.py install $(PYDESTDIR)
> + -mkdir -p $(BINDIR)
> + install -m 755 $(TARGET) $(BINDIR)/$(TARGET:.py=)
> +
> +clean distclean:
> + $(PYTHON) setup.py clean
> + rm -fr build
> + rm -f refpol_ilc/*.pyc
> +
> diff --git a/refpol_ilc/refpol_ilc.py b/refpol_ilc/refpol_ilc.py
> new file mode 100755
> index 0000000..31021b4
> --- /dev/null
> +++ b/refpol_ilc/refpol_ilc.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 refpol_ilc.refpol_ilc
> +import sys
> +
> +try:
> + refpol_ilc.refpol_ilc.main()
> +except Exception as e:
> + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n")
> + sys.exit(1)
> diff --git a/refpol_ilc/refpol_ilc/__init__.py b/refpol_ilc/refpol_ilc/__init__.py
> new file mode 100644
> index 0000000..e69de29
> diff --git a/refpol_ilc/refpol_ilc/refpol_ilc.py b/refpol_ilc/refpol_ilc/refpol_ilc.py
> new file mode 100644
> index 0000000..7e5430e
> --- /dev/null
> +++ b/refpol_ilc/refpol_ilc/refpol_ilc.py
> @@ -0,0 +1,193 @@
> +#!/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
> +import os.path
> +import tempfile
> +from refpol import refpol
> +from refpol import refpolicy2refpol
> +import shutil
> +import subprocess
> +import sys
> +
> +build_directory = "/usr/share/selinux/refpol_ilc/build"
> +
> +# setup PATH (for gcc) if missing
> +if not "PATH" in os.environ:
> + os.environ["PATH"] = "/bin:/usr/bin"
> +
> +def to_bool(str):
> + return {
> + "true" : True,
> + "t" : True,
> + "1" : True,
> + "false" : False,
> + "f" : False,
> + "0" : False,
> + }[str.lower()]
> +
> +usage = "%prog [OPTIONS] MODULE MODULE ..."
> +version = "%prog 1.0"
> +
> +def main():
> + def disabled(option, opt_str, value, parser, *args, **kwargs):
> + parser.values.disabled.append(value)
> +
> + # create cmdline parser
> + parser = OptionParser(usage = usage, version = version)
> + parser.add_option("-d", "--disabled", action = "callback", callback = disabled, type = "string", default = [], dest = "disabled", help = "indicates module is disabled", metavar = "FILE")
> + 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("-b", "--build-template", action = "store", default = build_directory, dest = "build_template", help = "build template directory (Default: %s)" % 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()
> + if len(args) <= 0:
> + parser.error("Invalid number of arguments %d." % len(args))
> +
> + # save the working directory
> + saved_cwd = os.getcwd()
> +
> + force = options.force
> + refpol.force = options.force
> + refpolicy2refpol.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("-refpol_ilc")
> + else:
> + shutil.rmtree(options.tmp, ignore_errors = True)
> + os.mkdir(options.tmp)
> +
> + # copy build dir template
> + build_root = options.tmp + "/build"
> + shutil.copytree(options.build_template, build_root)
> +
> + # set default policy TYPE
> + type = "standard"
> +
> + # copy modules into build dir
> + special_names = dict(zip(["_" + os.path.basename(i).rsplit('.', 1)[0] for i in refpolicy2refpol.specials("")], refpolicy2refpol.specials(build_root)))
> + disabled_names = [os.path.basename(os.path.dirname(i)) for i in options.disabled]
> +
> + all_modules = []
> + all_modules.extend(args)
> + all_modules.extend(options.disabled)
> + for path in all_modules:
> + module_name = os.path.basename(os.path.dirname(path))
> +
> + if module_name in special_names and not module_name in disabled_names:
> + if module_name == "_mls":
> + type = "mls"
> + elif module_name == "_mcs" and type != "mls":
> + type = "mcs"
> +
> + # copy to special location
> + with open(path, "r") as input:
> + with open(special_names[module_name], "w") as output:
> + for line in input:
> + # remove policy_module statement
> + if not line.strip().startswith("policy_module"):
> + output.write(line)
> + elif module_name == "_defines":
> + shutil.copy(path, build_root + "/_defines.ref")
> + else:
> + # copy module to policy/kernel/
> + dest_ref = build_root + "/policy/modules/kernel/" + module_name + ".ref"
> + dest_name = build_root + "/policy/modules/kernel/" + module_name
> + shutil.copy(path, dest_ref)
> +
> + refpol.ref_to_itf(dest_ref, dest_name + ".if", dest_name + ".te", dest_name + ".fc")
> +
> + os.chdir(build_root)
> +
> + # compose build.conf (build.conf.in from _defines.ref)
> + with open("_defines.ref", "r") as input:
> + with open("build.conf", "w") as output:
> + # write out the type
> + output.write("TYPE = %s\n\n" % type)
> +
> + # write out monolithic
> + output.write("MONOLITHIC = n\n\n")
> +
> + for line in input:
> + # remove policy_module statement
> + if not line.strip().startswith("policy_module"):
> + output.write(line)
> +
> + # make conf
> + p = subprocess.Popen("make conf", shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE, close_fds = True)
> +
> + (stdout, stderr) = p.communicate()
> + sys.stderr.write(stdout)
> + sys.stderr.write(stderr)
> +
> + if p.returncode != 0:
> + raise Exception("Failed to run make conf (%d)." % p.returncode)
> +
> + # sed modules.conf to base module if enabled
> + sed_cmd = "sed -i '1,/^END/{ s/= module/= base/; "
> + disabled_len = len(options.disabled)
> + if disabled_len > 0:
> + sed_cmd = sed_cmd + "s/\\("
> + i = 0
> + for d in options.disabled:
> + i = i + 1
> + sed_cmd = sed_cmd + os.path.basename(os.path.dirname(d))
> + if i != disabled_len:
> + sed_cmd = sed_cmd + "\\|"
> + sed_cmd = sed_cmd + "\\) = base/\\1 = off/ "
> + sed_cmd = sed_cmd + "}' policy/modules.conf"
> +
> + p = subprocess.Popen(sed_cmd, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE, close_fds = True)
> +
> + (stdout, stderr) = p.communicate()
> + sys.stderr.write(stdout)
> + sys.stderr.write(stderr)
> +
> + if p.returncode != 0:
> + raise Exception("Failed to modify modules.conf (%d)." % p.returncode)
> +
> + # make base module
> + p = subprocess.Popen("make base.pp", shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE, close_fds = True)
> +
> + (stdout, stderr) = p.communicate()
> + sys.stderr.write(stdout)
> + sys.stderr.write(stderr)
> +
> + if p.returncode != 0:
> + raise Exception("Failed to run make base.pp (%d)." % p.returncode)
> +
> + # output base module
> + options.output.write(open("base.pp", "r").read())
> + finally:
> + if to_bool(options.cleanup):
> + shutil.rmtree(options.tmp)
> +
> + 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/refpol_ilc/setup.py b/refpol_ilc/setup.py
> new file mode 100755
> index 0000000..31c3a14
> --- /dev/null
> +++ b/refpol_ilc/setup.py
> @@ -0,0 +1,13 @@
> +#!/usr/bin/python
> +
> +from distutils.core import setup
> +
> +setup( name = "refpol_ilc",
> + version = "0.1",
> + description = "Refpol Intermediate Language Compiler",
> +# url = "",
> + author = "Caleb Case",
> + author_email = "ccase@tresys.com",
> + license = "LGPL v2.1",
> + packages = ['refpol_ilc'],
> + )
-- James Carter <jwcart2@tycho.nsa.gov> National Security Agency -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@tycho.nsa.gov with the words "unsubscribe selinux" without quotes as the message.