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selinux: [PATCH 01/15] [src-policy] refpol language and tools

[PATCH 01/15] [src-policy] refpol language and tools

From: Caleb Case <ccase_at_nospam>
Date: Tue Jan 26 2010 - 22:08:07 GMT
To: selinux@tycho.nsa.gov


[refpol Language]

The refpol language is a simple transformation of a standard Reference Policy module consisting of 3 files to a single file format with sections. Each Reference Policy file is placed into a refpol section as follows: <module>.if => [interface] <module>.te => [policy] <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.
  • If a file has at least one section marker and there is text before the first section then this is an error.
  • There can be at most one of each valid section marker in a file.
  • A file without any section markers is assumed to be only policy.
  • The valid contents of each section are the same as for the separate reference policy files.
  • The standard filename extension is '.ref'.

[refpol Tool]

The refpol tool can create a refpol module from a Reference Policy module.

   Usage: refpol COMMAND [OPTIONS] MODULE.ref

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

Example:

# refpol create -i alsa.if -p alsa.te -c alsa.fc alsa.ref

refpol modules should have the '.ref' extension. The resulting alsa.ref looks like this:

   [interface]

   policy_module(alsa, 1.8.0) ######################################## #
   # Declarations
   #
   <snip>

   [policy]
   ## <summary>Ainit ALSA configuration tool</summary>    <snip>

   [context]
   /bin/alsaunmute -- gen_context(system_u:object_r:alsa_exec_t,s0)    <snip>

[refpol HLL compiler]

The refpolc high level language (HLL) compiler performs basic formatting checks and extracts the policy version from the policy_module statement.

   Usage: refpolc [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 -o FILE, --output=FILE output file

Example:

# refpolc < apache.ref > apache.cil 3<> apache.version --- Makefile | 2 +- refpol/COPYING | 504 +++++++++++++++++++++++++++++++++++++++++++++ refpol/Makefile | 27 +++ refpol/refpol.conf | 4 + refpol/refpol.py | 17 ++ refpol/refpol/refpol.py | 176 ++++++++++++++++ refpol/refpol/refpolc.py | 77 +++++++ refpol/refpolc.py | 17 ++ refpol/setup.py | 13 ++ 9 files changed, 836 insertions(+), 1 deletions(-) create mode 100644 refpol/COPYING create mode 100644 refpol/Makefile create mode 100644 refpol/refpol.conf create mode 100755 refpol/refpol.py create mode 100644 refpol/refpol/__init__.py create mode 100644 refpol/refpol/refpol.py create mode 100644 refpol/refpol/refpolc.py create mode 100755 refpol/refpolc.py create mode 100755 refpol/setup.py diff --git a/Makefile b/Makefile index 373ce23..c174327 100644 --- a/Makefile +++ b/Makefile @@ -1,4 +1,4 @@ -SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils # policy +SUBDIRS=libsepol libselinux libsemanage sepolgen checkpolicy policycoreutils refpol # policy PYSUBDIRS=libselinux libsemanage ifeq ($(DEBUG),1) diff --git a/refpol/COPYING b/refpol/COPYING new file mode 100644 index 0000000..8add30a --- /dev/null +++ b/refpol/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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See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +Also add information on how to contact you by electronic and paper mail. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the library, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + <signature of Ty Coon>, 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! + + diff --git a/refpol/Makefile b/refpol/Makefile new file mode 100644 index 0000000..f081eda --- /dev/null +++ b/refpol/Makefile @@ -0,0 +1,27 @@ +PREFIX ?= $(DESTDIR)/usr +BINDIR ?= $(PREFIX)/bin + +LANGUAGEDIR ?= $(DESTDIR)/etc/selinux/language.d + +PYTHON ?= python + +ifneq ($(origin DESTDIR), undefined) + PYDESTDIR ?= --root=$(DESTDIR) +endif + +all: + $(PYTHON) setup.py build + +install: all + $(PYTHON) setup.py install $(PYDESTDIR) + -mkdir -p $(BINDIR) + install -m 755 refpol.py $(BINDIR)/refpol + install -m 755 refpolc.py $(BINDIR)/refpolc + -mkdir -p $(LANGUAGEDIR) + install -m 644 refpol.conf $(LANGUAGEDIR) + +clean distclean: + $(PYTHON) setup.py clean + rm -fr build + rm -f refpol/*.pyc + diff --git a/refpol/refpol.conf b/refpol/refpol.conf new file mode 100644 index 0000000..5f1b7b1 --- /dev/null +++ b/refpol/refpol.conf @@ -0,0 +1,4 @@ +NAME="Reference Policy" +COMPILER="/usr/bin/refpolc" +EXTENSION="ref" +FLAGS="" diff --git a/refpol/refpol.py b/refpol/refpol.py new file mode 100755 index 0000000..c3ebba1 --- /dev/null +++ b/refpol/refpol.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.refpol +import sys + +try: + refpol.refpol.main() +except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/refpol/refpol/__init__.py b/refpol/refpol/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/refpol/refpol/refpol.py b/refpol/refpol/refpol.py new file mode 100644 index 0000000..ad82ef9 --- /dev/null +++ b/refpol/refpol/refpol.py @@ -0,0 +1,176 @@ +#!/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 +import shutil +import sys + +force = False + +def file_exists(path): + if os.path.isfile(path) and not force: + raise Exception("File already exists: %s" % path) + +def itf_to_ref(if_p, te_p, fc_p, ref_p): + file_exists(ref_p) + + if not if_p and not te_p and not fc_p: + raise Exception("No input files specified.") + + sections = [ + ("[interface]", if_p), + ("[policy]", te_p), + ("[context]", fc_p), + ] + + with open(ref_p, 'w') as out: + for (section, path) in sections: + if path: + with open(path, 'r') as f: + out.write("\n" + section + "\n") + shutil.copyfileobj(f, out) + +def ref_to_itf(ref_p, if_p, te_p, fc_p): + verify_ref(ref_p) + + output = None + default = False + + sections = { + "[interface]" : if_p, + "[policy]" : te_p, + "[context]" : fc_p, + } + + try: + with open(ref_p, 'r') as input: + for line in input: + section = line.strip() + if section in sections: + if default is True: + raise Exception("%s section defined, but already found rules in default section." % section) + if output is not None: + output.close() + file_exists(sections[section]) + output = open(sections[section], 'w') + else: + if output is None: + if section == "": + # ignore blank lines before first section + continue + + # output to the default (policy) + file_exists(te_p) + output = open(te_p, 'w') + + # create empty if and fc + file_exists(if_p) + with open(if_p, 'w') as f: + f.write("## <summary> </summary>\n") + file_exists(fc_p) + open(fc_p, 'w').close() + + default = True + output.write(line) + finally: + if output is not None: + output.close() + +def verify_ref(ref): + sections = { + "[interface]" : False, + "[policy]" : False, + "[context]" : False, + } + + default = False + + pattern = re.compile("\s*policy_module\((?P<name>\w+),\s*(?P<version>[0-9.]+)\).*") + result = None + + if isinstance(ref, str): + with open(ref, 'r') as input: + return verify_ref(input) + + lineno = 0 + for line in ref: + lineno = lineno + 1 + section = line.strip() + + if section == "": + # ignore blank lines + continue + elif section in sections: + if sections[section] is True: + raise Exception("Too many %s sections (%s:%d)." % (section, ref.name, lineno)) + if default is True: + raise Exception("%s section defined, but already found rules in default section (%s:%d)." % (section, ref.name, lineno)) + sections[section] = True + else: + if not any(sections.values()): + # we aren't in a section, but we found information + # this means we are must start the default section + default = True + + mod = pattern.match(line) + if mod: + result = { "name" : mod.group("name"), + "version" : mod.group("version")} + if not result: + raise Exception("Failed to find the policy module statement! (%s)" % ref.name) + + return result + +def verify_ext(ref_p): + ext = ref_p.rsplit('.', 1)[1] + if ext != "ref": + raise Exception("Invalid refpol file extension %s on %s." % (ext, ref_p)) + +usage = """%prog COMMAND [OPTIONS] MODULE.ref + +Commands: + create create a new refpol + extract extract .if, .te, and .fc files from a refpol""" + +version = "%prog 1.0" + +def main(): + parser = OptionParser(usage = usage, version = version) + parser.add_option("-f", "--force", action = "store_true", default = False, dest = "force", help = "force overwriting existing files") + + create_options = OptionGroup(parser, "Create options") + create_options.add_option("-i", "--interface", action = "store", default = None, dest = "ifp", help = "interface file", metavar = "FILE") + create_options.add_option("-p", "--policy", action = "store", default = None, dest = "tep", help = "policy file", metavar = "FILE") + create_options.add_option("-c", "--context", action = "store", default = None, dest = "fcp", help = "context 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 + + verify_ext(args[1]) + + command = args[0] + if command == "create": + itf_to_ref(options.ifp, options.tep, options.fcp, args[1]) + elif command == "extract": + module = args[1].rsplit('.', 1)[0] + ref_to_itf(args[1], module + ".if", module + ".te", 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/refpol/refpol/refpolc.py b/refpol/refpol/refpolc.py new file mode 100644 index 0000000..e04be32 --- /dev/null +++ b/refpol/refpol/refpolc.py @@ -0,0 +1,77 @@ +#!/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 refpol +import shutil +import sys +import tempfile + +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("-o", "--output", action = "store", default = None, dest = "output", help = "output file", metavar = "FILE") + + # 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]) + + 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: + with tempfile.SpooledTemporaryFile(suffix="-refpolc") as tmp: + # copy input into a tmp location + # this is needed since you can't seek stdin + shutil.copyfileobj(options.input, tmp) + + # borrow the input name so that error msg are correct + tmp.name = options.input.name + + # reset & verify the tmp file + tmp.seek(0) + mod = refpol.verify_ref(tmp) + + with os.fdopen(3, "w") as ver: + ver.write(mod["version"]); + + # reset & copy tmp file to output + tmp.seek(0) + shutil.copyfileobj(tmp, options.output) + + finally: + options.input.close() + options.output.close() + +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/refpolc.py b/refpol/refpolc.py new file mode 100755 index 0000000..b98c43e --- /dev/null +++ b/refpol/refpolc.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.refpolc +import sys + +try: + refpol.refpolc.main() +except Exception as e: + sys.stderr.write(sys.argv[0] + ": Error: " + str(e) + "\n") + sys.exit(1) diff --git a/refpol/setup.py b/refpol/setup.py new file mode 100755 index 0000000..2cac202 --- /dev/null +++ b/refpol/setup.py @@ -0,0 +1,13 @@ +#!/usr/bin/python + +from distutils.core import setup + +setup( name = "refpol", + version = "0.1", + description = "Refpol Tool", +# url = "", + author = "Caleb Case", + author_email = "ccase@tresys.com", + license = "LGPL v2.1", + packages = ['refpol'], + ) -- 1.6.3.3 -- This message was distributed to subscribers of the selinux mailing list. 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