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# -*- coding: utf-8 -*-
#
# Copyright (C) 2015-2016 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/>.
#
"""The ipset command wrapper"""
__all__ = [ "ipset", "check_ipset_name", "remove_default_create_options" ]
import os.path
import ipaddress
from firewall import errors
from firewall.errors import FirewallError
from firewall.core.prog import runProg
from firewall.core.logger import log
from firewall.functions import tempFile, readfile
from firewall.config import COMMANDS
IPSET_MAXNAMELEN = 32
IPSET_TYPES = [
# bitmap and set types are currently not supported
# "bitmap:ip",
# "bitmap:ip,mac",
# "bitmap:port",
# "list:set",
"hash:ip",
"hash:ip,port",
"hash:ip,port,ip",
"hash:ip,port,net",
"hash:ip,mark",
"hash:net",
"hash:net,net",
"hash:net,port",
"hash:net,port,net",
"hash:net,iface",
"hash:mac",
]
IPSET_CREATE_OPTIONS = {
"family": "inet|inet6",
"hashsize": "value",
"maxelem": "value",
"timeout": "value in secs",
#"counters": None,
#"comment": None,
}
IPSET_DEFAULT_CREATE_OPTIONS = {
"family": "inet",
"hashsize": "1024",
"maxelem": "65536",
}
class ipset(object):
"""ipset command wrapper class"""
def __init__(self):
self._command = COMMANDS["ipset"]
self.name = "ipset"
def __run(self, args):
"""Call ipset with args"""
# convert to string list
_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 check_name(self, name):
"""Check ipset name"""
if len(name) > IPSET_MAXNAMELEN:
raise FirewallError(errors.INVALID_NAME,
"ipset name '%s' is not valid" % name)
def set_supported_types(self):
"""Return types that are supported by the ipset command and kernel"""
ret = [ ]
output = ""
try:
output = self.__run(["--help"])
except ValueError as ex:
log.debug1("ipset error: %s" % ex)
lines = output.splitlines()
in_types = False
for line in lines:
#print(line)
if in_types:
splits = line.strip().split(None, 2)
if splits[0] not in ret and splits[0] in IPSET_TYPES:
ret.append(splits[0])
if line.startswith("Supported set types:"):
in_types = True
return ret
def check_type(self, type_name):
"""Check ipset type"""
if len(type_name) > IPSET_MAXNAMELEN or type_name not in IPSET_TYPES:
raise FirewallError(errors.INVALID_TYPE,
"ipset type name '%s' is not valid" % type_name)
def set_create(self, set_name, type_name, options=None):
"""Create an ipset with name, type and options"""
self.check_name(set_name)
self.check_type(type_name)
args = [ "create", set_name, type_name ]
if isinstance(options, dict):
for key, val in options.items():
args.append(key)
if val != "":
args.append(val)
return self.__run(args)
def set_destroy(self, set_name):
self.check_name(set_name)
return self.__run([ "destroy", set_name ])
def set_add(self, set_name, entry):
args = [ "add", set_name, entry ]
return self.__run(args)
def set_delete(self, set_name, entry):
args = [ "del", set_name, entry ]
return self.__run(args)
def test(self, set_name, entry, options=None):
args = [ "test", set_name, entry ]
if options:
args.append("%s" % " ".join(options))
return self.__run(args)
def set_list(self, set_name=None, options=None):
args = [ "list" ]
if set_name:
args.append(set_name)
if options:
args.extend(options)
return self.__run(args).split("\n")
def set_get_active_terse(self):
""" Get active ipsets (only headers) """
lines = self.set_list(options=["-terse"])
ret = { }
_name = _type = None
_options = { }
for line in lines:
if len(line) < 1:
continue
pair = [ x.strip() for x in line.split(":", 1) ]
if len(pair) != 2:
continue
elif pair[0] == "Name":
_name = pair[1]
elif pair[0] == "Type":
_type = pair[1]
elif pair[0] == "Header":
splits = pair[1].split()
i = 0
while i < len(splits):
opt = splits[i]
if opt in [ "family", "hashsize", "maxelem", "timeout",
"netmask" ]:
if len(splits) > i:
i += 1
_options[opt] = splits[i]
else:
log.error("Malformed ipset list -terse output: %s",
line)
return { }
i += 1
if _name and _type:
ret[_name] = (_type,
remove_default_create_options(_options))
_name = _type = None
_options.clear()
return ret
def save(self, set_name=None):
args = [ "save" ]
if set_name:
args.append(set_name)
return self.__run(args)
def set_restore(self, set_name, type_name, entries,
create_options=None, entry_options=None):
self.check_name(set_name)
self.check_type(type_name)
temp_file = tempFile()
if ' ' in set_name:
set_name = "'%s'" % set_name
args = [ "create", set_name, type_name, "-exist" ]
if create_options:
for key, val in create_options.items():
args.append(key)
if val != "":
args.append(val)
temp_file.write("%s\n" % " ".join(args))
temp_file.write("flush %s\n" % set_name)
for entry in entries:
if ' ' in entry:
entry = "'%s'" % entry
if entry_options:
temp_file.write("add %s %s %s\n" % \
(set_name, entry, " ".join(entry_options)))
else:
temp_file.write("add %s %s\n" % (set_name, entry))
temp_file.close()
stat = os.stat(temp_file.name)
log.debug2("%s: %s restore %s", self.__class__, self._command,
"%s: %d" % (temp_file.name, stat.st_size))
args = [ "restore" ]
(status, ret) = runProg(self._command, args,
stdin=temp_file.name)
if log.getDebugLogLevel() > 2:
try:
readfile(temp_file.name)
except Exception:
pass
else:
i = 1
for line in readfile(temp_file.name):
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._command,
" ".join(args), ret))
return ret
def set_flush(self, set_name):
args = [ "flush" ]
if set_name:
args.append(set_name)
return self.__run(args)
def rename(self, old_set_name, new_set_name):
return self.__run([ "rename", old_set_name, new_set_name ])
def swap(self, set_name_1, set_name_2):
return self.__run([ "swap", set_name_1, set_name_2 ])
def version(self):
return self.__run([ "version" ])
def check_ipset_name(name):
"""Return true if ipset name is valid"""
if len(name) > IPSET_MAXNAMELEN:
return False
return True
def remove_default_create_options(options):
""" Return only non default create options """
_options = options.copy()
for opt in IPSET_DEFAULT_CREATE_OPTIONS:
if opt in _options and \
IPSET_DEFAULT_CREATE_OPTIONS[opt] == _options[opt]:
del _options[opt]
return _options
def normalize_ipset_entry(entry):
""" Normalize IP addresses in entry """
_entry = []
for _part in entry.split(","):
try:
_part.index("/")
_entry.append(str(ipaddress.ip_network(_part, strict=False)))
except ValueError:
_entry.append(_part)
return ",".join(_entry)
def check_entry_overlaps_existing(entry, entries):
""" Check if entry overlaps any entry in the list of entries """
# Only check simple types
if len(entry.split(",")) > 1:
return
try:
entry_network = ipaddress.ip_network(entry, strict=False)
except ValueError:
# could not parse the new IP address, maybe a MAC
return
for itr in entries:
if entry_network.overlaps(ipaddress.ip_network(itr, strict=False)):
raise FirewallError(errors.INVALID_ENTRY, "Entry '{}' overlaps with existing entry '{}'".format(entry, itr))
def check_for_overlapping_entries(entries):
""" Check if any entry overlaps any entry in the list of entries """
try:
entries = [ipaddress.ip_network(x, strict=False) for x in entries]
except ValueError:
# at least one entry can not be parsed
return
if len(entries) == 0:
return
# We can take advantage of some facts of IPv4Network/IPv6Network and
# how Python sorts the networks to quickly detect overlaps.
#
# Facts:
#
# 1. IPv{4,6}Network are normalized to remove host bits, e.g.
# 10.1.1.0/16 will become 10.1.0.0/16.
#
# 2. IPv{4,6}Network objects are sorted by:
# a. IP address (network bits)
# then
# b. netmask (significant bits count)
#
# Because of the above we have these properties:
#
# 1. big networks (netA) are sorted before smaller networks (netB)
# that overlap the big network (netA)
# - e.g. 10.1.128.0/17 (netA) sorts before 10.1.129.0/24 (netB)
# 2. same value addresses (network bits) are grouped together even
# if the number of network bits vary. e.g. /16 vs /24
# - recall that address are normalized to remove host bits
# - e.g. 10.1.128.0/17 (netA) sorts before 10.1.128.0/24 (netC)
# 3. non-overlapping networks (netD, netE) are always sorted before or
# after networks that overlap (netB, netC) the current one (netA)
# - e.g. 10.1.128.0/17 (netA) sorts before 10.2.128.0/16 (netD)
# - e.g. 10.1.128.0/17 (netA) sorts after 9.1.128.0/17 (netE)
# - e.g. 9.1.128.0/17 (netE) sorts before 10.1.129.0/24 (netB)
#
# With this we know the sorted list looks like:
#
# list: [ netE, netA, netB, netC, netD ]
#
# netE = non-overlapping network
# netA = big network
# netB = smaller network that overlaps netA (subnet)
# netC = smaller network that overlaps netA (subnet)
# netD = non-overlapping network
#
# If networks netB and netC exist in the list, they overlap and are
# adjacent to netA.
#
# Checking for overlaps on a sorted list is thus:
#
# 1. compare adjacent elements in the list for overlaps
#
# Recall that we only need to detect a single overlap. We do not need to
# detect them all.
#
entries.sort()
prev_network = entries.pop(0)
for current_network in entries:
if prev_network.overlaps(current_network):
raise FirewallError(errors.INVALID_ENTRY, "Entry '{}' overlaps entry '{}'".format(prev_network, current_network))
prev_network = current_network
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