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Viewing file:     audit2allow (9.51 KB)      -rwxr-xr-x

#! /usr/bin/python -E
# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2006-2007  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
#

import sys
import tempfile

import sepolgen.audit as audit
import sepolgen.policygen as policygen
import sepolgen.interfaces as interfaces
import sepolgen.output as output
import sepolgen.objectmodel as objectmodel
import sepolgen.defaults as defaults
import sepolgen.module as module
from sepolgen.sepolgeni18n import _

class AuditToPolicy:
    VERSION = "%prog .1"
    SYSLOG = "/var/log/messages"

    def __init__(self):
        self.__options = None
        self.__parser = None
        self.__avs = None

    def __parse_options(self):
        from optparse import OptionParser

        parser = OptionParser(version=self.VERSION)
        parser.add_option("-a", "--all", action="store_true", dest="audit", default=False,
                          help="read input from audit log - conflicts with -i")
        parser.add_option("-d", "--dmesg", action="store_true", dest="dmesg", default=False,
                          help="read input from dmesg - conflicts with --audit and --input")
        parser.add_option("-i", "--input", dest="input",
                          help="read input from <input> - conflicts with -a")
        parser.add_option("-l", "--lastreload", action="store_true", dest="lastreload", default=False,
                          help="read input only after the last reload")
        parser.add_option("-r", "--requires", action="store_true", dest="requires", default=False,
                          help="generate require statements for rules")
        parser.add_option("-m", "--module", dest="module",
                          help="set the module name - implies --requires")
        parser.add_option("-M", "--module-package", dest="module_package",
                          help="generate a module package - conflicts with -o and -m")
        parser.add_option("-o", "--output", dest="output",
                          help="append output to <filename>, conflicts with -M")
        parser.add_option("-R", "--reference", action="store_true", dest="refpolicy",
                          default=False, help="generate refpolicy style output")
        parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
                          default=False, help="explain generated output")
        parser.add_option("-e", "--explain", action="store_true", dest="explain_long",
                          default=False, help="fully explain generated output")
        parser.add_option("-t", "--type", help="only process messages with a type that matches this regex",
                          dest="type")
        parser.add_option("--perm-map", dest="perm_map", help="file name of perm map")
        parser.add_option("--interface-info", dest="interface_info", help="file name of interface information")
        parser.add_option("--debug", dest="debug", action="store_true", default=False,
                          help="leave generated modules for -M")

        options, args = parser.parse_args()

        # Make -d, -a, and -i conflict
        if options.audit is True:
            if options.input is not None:
                sys.stderr.write("error: --audit conflicts with --input\n")
            if options.dmesg is True:
                sys.stderr.write("error: --audit conflicts with --dmesg\n")
        if options.input is not None and options.dmesg is True:
            sys.stderr.write("error: --input conflicts with --dmesg\n")

        # Turn on requires generation if a module name is given. Also verify
        # the module name.
        if options.module:
            name = options.module
        else:
            name = options.module_package
        if name:
            options.requires = True
            if not module.is_valid_name(name):
                sys.stderr.write("only letters and numbers allowed in module names\n")
                sys.exit(2)

        # Make -M and -o conflict
        if options.module_package:
            if options.output:
                sys.stderr.write("error: --module-package conflicts with --output\n")
                sys.exit(2)
            if options.module:
                sys.stderr.write("error: --module-package conflicts with --module\n")
                sys.exit(2)

        self.__options = options

    def __read_input(self):
        parser = audit.AuditParser(last_load_only=self.__options.lastreload)

        filename = None
        messages = None
        f = None

        # Figure out what input we want
        if self.__options.input is not None:
            filename = self.__options.input
        elif self.__options.dmesg:
            messages = audit.get_dmesg_msgs()
        elif self.__options.audit:
            try:
                messages = audit.get_audit_msgs()
            except OSError, e:
                sys.stderr.write('could not run ausearch - "%s"\n' % str(e))
                sys.exit(1)
        else:
            # This is the default if no input is specified
            f = sys.stdin

        # Get the input
        if filename is not None:
            try:
                f = open(filename)
            except IOError, e:
                sys.stderr.write('could not open file %s - "%s"\n' % (filename, str(e)))
                sys.exit(1)

        if f is not None:
            parser.parse_file(f)
            f.close()

        if messages is not None:
            parser.parse_string(messages)

        self.__parser = parser

    def __process_input(self):
        if self.__options.type:
            filter = audit.TypeFilter(self.__options.type)
            self.__avs = self.__parser.to_access(filter)
        else:
            self.__avs = self.__parser.to_access()

    def __load_interface_info(self):
        # Load interface info file
        if self.__options.interface_info:
            fn = self.__options.interface_info
        else:
            fn = defaults.interface_info()
        try:
            fd = open(fn)
        except:
            sys.stderr.write("could not open interface info [%s]\n" % fn)
            sys.exit(1)

        ifs = interfaces.InterfaceSet()
        ifs.from_file(fd)
        fd.close()

        # Also load perm maps
        if self.__options.perm_map:
            fn = self.__options.perm_map
        else:
            fn = defaults.perm_map()
        try:
            fd = open(fn)
        except:
            sys.stderr.write("could not open perm map [%s]\n" % fn)
            sys.exit(1)

        perm_maps = objectmodel.PermMappings()
        perm_maps.from_file(fd)

        return (ifs, perm_maps)

    def __output_modulepackage(self, writer, generator):
        generator.set_module_name(self.__options.module_package)
        filename = self.__options.module_package + ".te"
        packagename = self.__options.module_package + ".pp"

        try:
            fd = open(filename, "w")
        except IOError, e:
            sys.stderr.write("could not write output file: %s\n", str(e))
            sys.exit(1)

        writer.write(generator.get_module(), fd)
        fd.close()

        mc = module.ModuleCompiler()

        try:
            mc.create_module_package(filename, self.__options.refpolicy)
        except RuntimeError, e:
            print e
            sys.exit(1)

        sys.stdout.write(_("******************** IMPORTANT ***********************\n"))
        sys.stdout.write((_("To make this policy package active, execute:" +\
                                "\n\nsemodule -i %s\n\n") % packagename))

    def __output(self):
        g = policygen.PolicyGenerator()

        if self.__options.module:
            g.set_module_name(self.__options.module)

        # Interface generation
        if self.__options.refpolicy:
            ifs, perm_maps = self.__load_interface_info()
            g.set_gen_refpol(ifs, perm_maps)

        # Explanation
        if self.__options.verbose:
            g.set_gen_explain(policygen.SHORT_EXPLANATION)
        if self.__options.explain_long:
            g.set_gen_explain(policygen.LONG_EXPLANATION)

        # Requires
        if self.__options.requires:
            g.set_gen_requires(True)

        # Generate the policy
        g.add_access(self.__avs)

        # Output
        writer = output.ModuleWriter()

        # Module package
        if self.__options.module_package:
            self.__output_modulepackage(writer, g)
        else:
            # File or stdout
            if self.__options.module:
                g.set_module_name(self.__options.module)

            if self.__options.output:
                fd = open(self.__options.output, "w")
            else:
                fd = sys.stdout
            writer.write(g.get_module(), fd)

    def main(self):
        try:
            self.__parse_options()
            self.__read_input()
            self.__process_input()
            self.__output()
        except KeyboardInterrupt:
            sys.exit(0)

if __name__ == "__main__":
    app = AuditToPolicy()
    app.main()