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lib / python3.6 / site-packages / firewall / core /

?? ..
?? __init__.py(0 B)
?? __pycache__
?? base.py(2.05 KB)
?? ebtables.py(9.17 KB)
?? fw.py(49.22 KB)
?? fw_config.py(47.27 KB)
?? fw_direct.py(21.99 KB)
?? fw_helper.py(1.79 KB)
?? fw_icmptype.py(2.43 KB)
?? fw_ifcfg.py(2.5 KB)
?? fw_ipset.py(9.45 KB)
?? fw_nm.py(7.02 KB)
?? fw_policies.py(2.74 KB)
?? fw_policy.py(85.56 KB)
?? fw_service.py(1.6 KB)
?? fw_transaction.py(6.16 KB)
?? fw_zone.py(44.62 KB)
?? helper.py(804 B)
?? icmp.py(3.03 KB)
?? io
?? ipXtables.py(60.43 KB)
?? ipset.py(12.61 KB)
?? logger.py(30.31 KB)
?? modules.py(3.73 KB)
?? nftables.py(98.77 KB)
?? prog.py(1.47 KB)
?? rich.py(33.05 KB)
?? watcher.py(3.15 KB)

Editing: ebtables.py

# -*- coding: utf-8 -*-
#
# Copyright (C) 2010-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#

__all__ = [ "ebtables" ]

import os.path
from firewall.core.prog import runProg
from firewall.core.logger import log
from firewall.functions import tempFile, readfile, splitArgs
from firewall.config import COMMANDS
from firewall.core import ipXtables # some common stuff lives there
from firewall.errors import FirewallError, INVALID_IPV
import string

BUILT_IN_CHAINS = {
    "broute": [ "BROUTING" ],
    "nat": [ "PREROUTING", "POSTROUTING", "OUTPUT" ],
    "filter": [ "INPUT", "OUTPUT", "FORWARD" ],
}

DEFAULT_RULES = { }
LOG_RULES = { }
OUR_CHAINS = {}  # chains created by firewalld

for table in BUILT_IN_CHAINS.keys():
    DEFAULT_RULES[table] = [ ]
    OUR_CHAINS[table] = set()
    for chain in BUILT_IN_CHAINS[table]:
        DEFAULT_RULES[table].append("-N %s_direct" % chain)
        DEFAULT_RULES[table].append("-I %s 1 -j %s_direct" % (chain, chain))
        DEFAULT_RULES[table].append("-I %s_direct 1 -j RETURN" % chain)
        OUR_CHAINS[table].add("%s_direct" % chain)

class ebtables(object):
    ipv = "eb"
    name = "ebtables"
    policies_supported = False # ebtables only supported with direct interface

def __init__(self):
        self._command = COMMANDS[self.ipv]
        self._restore_command = COMMANDS["%s-restore" % self.ipv]
        self.restore_noflush_option = self._detect_restore_noflush_option()
        self.concurrent_option = self._detect_concurrent_option()
        self.fill_exists()
        self.available_tables = []

def fill_exists(self):
        self.command_exists = os.path.exists(self._command)
        self.restore_command_exists = os.path.exists(self._restore_command)

def _detect_concurrent_option(self):
        # Do not change any rules, just try to use the --concurrent option
        # with -L
        concurrent_option = ""
        ret = runProg(self._command, ["--concurrent", "-L"])
        if ret[0] == 0:
            concurrent_option = "--concurrent"  # concurrent for ebtables lock

return concurrent_option

def _detect_restore_noflush_option(self):
        # Do not change any rules, just try to use the restore command
        # with --noflush
        rules = [ ]
        try:
            self.set_rules(rules, "off")
        except ValueError:
            return False
        return True

def __run(self, args):
        # convert to string list
        _args = [ ]
        if self.concurrent_option and self.concurrent_option not in args:
            _args.append(self.concurrent_option)
        _args += ["%s" % item for item in args]
        log.debug2("%s: %s %s", self.__class__, self._command, " ".join(_args))
        (status, ret) = runProg(self._command, _args)
        if status != 0:
            raise ValueError("'%s %s' failed: %s" % (self._command,
                                                     " ".join(args), ret))
        return ret

def _rule_validate(self, rule):
        for str in ["%%REJECT%%", "%%ICMP%%", "%%LOGTYPE%%"]:
            if str in rule:
                raise FirewallError(INVALID_IPV,
                        "'%s' invalid for ebtables" % str)

def is_chain_builtin(self, ipv, table, chain):
        return table in BUILT_IN_CHAINS and \
               chain in BUILT_IN_CHAINS[table]

def build_chain_rules(self, add, table, chain):
        rules = []

if add:
            rules.append([ "-t", table, "-N", chain ])
            rules.append([ "-t", table, "-I", chain, "1", "-j", "RETURN" ])
        else:
            rules.append([ "-t", table, "-X", chain ])

return rules

def build_rule(self, add, table, chain, index, args):
        rule = [ "-t", table ]
        if add:
            rule += [ "-I", chain, str(index) ]
        else:
            rule += [ "-D", chain ]
        rule += args
        return rule

def reverse_rule(self, args):
        return ipXtables.common_reverse_rule(args)

def check_passthrough(self, args):
        ipXtables.common_check_passthrough(args)

def reverse_passthrough(self, args):
        return ipXtables.common_reverse_passthrough(args)

def set_rules(self, rules, log_denied):
        temp_file = tempFile()

table = "filter"
        table_rules = { }
        for _rule in rules:
            rule = _rule[:]

self._rule_validate(rule)

# get table form rule
            for opt in [ "-t", "--table" ]:
                try:
                    i = rule.index(opt)
                except ValueError:
                    pass
                else:
                    if len(rule) >= i+1:
                        rule.pop(i)
                        table = rule.pop(i)

# we can not use joinArgs here, because it would use "'" instead
            # of '"' for the start and end of the string, this breaks
            # iptables-restore
            for i in range(len(rule)):
                for c in string.whitespace:
                    if c in rule[i] and not (rule[i].startswith('"') and
                                             rule[i].endswith('"')):
                        rule[i] = '"%s"' % rule[i]

table_rules.setdefault(table, []).append(rule)

for table in table_rules:
            temp_file.write("*%s\n" % table)
            for rule in table_rules[table]:
                temp_file.write(" ".join(rule) + "\n")

temp_file.close()

stat = os.stat(temp_file.name)
        log.debug2("%s: %s %s", self.__class__, self._restore_command,
                   "%s: %d" % (temp_file.name, stat.st_size))
        args = [ ]
        args.append("--noflush")

(status, ret) = runProg(self._restore_command, args,
                                stdin=temp_file.name)

if log.getDebugLogLevel() > 2:
            lines = readfile(temp_file.name)
            if lines is not None:
                i = 1
                for line in lines:
                    log.debug3("%8d: %s" % (i, line), nofmt=1, nl=0)
                    if not line.endswith("\n"):
                        log.debug3("", nofmt=1)
                    i += 1

os.unlink(temp_file.name)

if status != 0:
            raise ValueError("'%s %s' failed: %s" % (self._restore_command,
                                                     " ".join(args), ret))

def set_rule(self, rule, log_denied):
        self._rule_validate(rule)
        return self.__run(rule)

def get_available_tables(self, table=None):
        ret = []
        tables = [ table ] if table else BUILT_IN_CHAINS.keys()
        for table in tables:
            if table in self.available_tables:
                ret.append(table)
            else:
                try:
                    self.__run(["-t", table, "-L"])
                    self.available_tables.append(table)
                    ret.append(table)
                except ValueError:
                    log.debug1("ebtables table '%s' does not exist." % table)

return ret

def get_zone_table_chains(self, table):
        return {}

def build_flush_rules(self):
        rules = []
        for table in BUILT_IN_CHAINS.keys():
            if table not in self.get_available_tables():
                continue
            # Flush firewall rules: -F
            # Delete firewall chains: -X
            # Set counter to zero: -Z
            for flag in [ "-F", "-X", "-Z" ]:
                rules.append(["-t", table, flag])
        return rules

def build_set_policy_rules(self, policy):
        rules = []
        _policy = "DROP" if policy == "PANIC" else policy
        for table in BUILT_IN_CHAINS.keys():
            if table not in self.get_available_tables():
                continue
            for chain in BUILT_IN_CHAINS[table]:
                rules.append(["-t", table, "-P", chain, _policy])
        return rules

def build_default_tables(self):
        # nothing to do, they always exist
        return []

def build_default_rules(self, log_denied="off"):
        default_rules = []
        for table in DEFAULT_RULES:
            if table not in self.get_available_tables():
                continue
            _default_rules = DEFAULT_RULES[table][:]
            if log_denied != "off" and table in LOG_RULES:
                _default_rules.extend(LOG_RULES[table])
            prefix = [ "-t", table ]
            for rule in _default_rules:
                if type(rule) == list:
                    default_rules.append(prefix + rule)
                else:
                    default_rules.append(prefix + splitArgs(rule))
        return default_rules

def is_ipv_supported(self, ipv):
        return ipv == self.ipv

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Editing: ebtables.py

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