#!/usr/bin/python3 -Es
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#
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# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
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#
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# Copyright (C) 2006 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Parse interfaces and output extracted information about them
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# suitable for policy generation. By default writes the output
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# to the default location (obtained from sepolgen.defaults), but
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# will output to another file provided as an argument:
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# sepolgen-ifgen [headers] [output-filename]
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import sys
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import os
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import tempfile
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import subprocess
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import selinux
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import sepolgen.refparser as refparser
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import sepolgen.defaults as defaults
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import sepolgen.interfaces as interfaces
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VERSION = "%prog .1"
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ATTR_HELPER = "/usr/bin/sepolgen-ifgen-attr-helper"
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def parse_options():
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from optparse import OptionParser
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parser = OptionParser(version=VERSION)
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parser.add_option("-o", "--output", dest="output", default=defaults.interface_info(),
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help="filename to store output")
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parser.add_option("-i", "--interfaces", dest="headers", default=defaults.headers(),
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help="location of the interface header files")
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parser.add_option("-a", "--attribute_info", dest="attribute_info")
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parser.add_option("-p", "--policy", dest="policy_path")
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parser.add_option("-v", "--verbose", action="store_true", default=False,
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help="print debuging output")
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parser.add_option("-d", "--debug", action="store_true", default=False,
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help="extra debugging output")
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parser.add_option("--attr-helper", default=ATTR_HELPER,
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help="path to sepolgen-ifgen-attr-helper")
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parser.add_option("--no_attrs", action="store_true", default=False,
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help="do not retrieve attribute access from kernel policy")
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options, args = parser.parse_args()
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return options
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def get_policy():
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p = selinux.selinux_current_policy_path()
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if p and os.path.exists(p):
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return p
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i = selinux.security_policyvers()
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p = selinux.selinux_binary_policy_path() + "." + str(i)
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while i > 0 and not os.path.exists(p):
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i = i - 1
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p = selinux.selinux_binary_policy_path() + "." + str(i)
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if i > 0:
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return p
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return None
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def get_attrs(policy_path, attr_helper):
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try:
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if not policy_path:
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policy_path = get_policy()
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if not policy_path:
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sys.stderr.write("No installed policy to check\n")
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return None
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outfile = tempfile.NamedTemporaryFile()
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except IOError as e:
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sys.stderr.write("could not open attribute output file\n")
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return None
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except OSError:
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# SELinux Disabled Machine
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return None
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fd = open("/dev/null", "w")
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ret = subprocess.Popen([attr_helper, policy_path, outfile.name], stdout=fd).wait()
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fd.close()
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if ret != 0:
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sys.stderr.write("could not run attribute helper\n")
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return None
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attrs = interfaces.AttributeSet()
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try:
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attrs.from_file(outfile)
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except:
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print("error parsing attribute info")
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return None
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return attrs
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def main():
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options = parse_options()
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# Open the output first to generate errors before parsing
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try:
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f = open(options.output, "w")
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except IOError as e:
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sys.stderr.write("could not open output file [%s]\n" % options.output)
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return 1
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if options.verbose:
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log = sys.stdout
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else:
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log = None
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# Get the attibutes from the binary
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attrs = None
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if not options.no_attrs:
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attrs = get_attrs(options.policy_path, options.attr_helper)
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if attrs is None:
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return 1
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# Parse the headers
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try:
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headers = refparser.parse_headers(options.headers, output=log, debug=options.debug)
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except ValueError as e:
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sys.stderr.write("error parsing headers: %s\n" % e)
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return 1
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if_set = interfaces.InterfaceSet(output=log)
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if_set.add_headers(headers, attributes=attrs)
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if_set.to_file(f)
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f.close()
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if refparser.success:
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return 0
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else:
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return 1
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if __name__ == "__main__":
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sys.exit(main())
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