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# Copyright 2020 Red Hat, Inc. Jake Hunsaker <jhunsake@redhat.com>
# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.
import ipaddress
import random
from sos.cleaner.mappings import SoSMap
class SoSIPMap(SoSMap):
"""A mapping store for IP addresses
Each IP address added to this map is chcked for subnet membership. If that
subnet already exists in the map, then IP addresses are deterministically
generated sequentially within that subnet. For example, if a given IP is
matched to subnet 192.168.1.0/24 then 192.168.1 may be obfuscated to
100.11.12.0/24. Each IP address in the original 192.168.1.0/24 subnet
will then be assigned an address in 100.11.12.0/24 sequentially, such as
100.11.12.1, 100.11.12.2, etc...
Internally, the ipaddress library is used to manipulate the address objects
however, when retrieved by SoSCleaner any values will be strings.
"""
ignore_matches = [
r'127.*',
r'::1',
r'0\.(.*)?',
r'1\.(.*)?',
r'8.8.8.8',
r'8.8.4.4',
r'169.254.*',
r'255.*'
]
_networks = {}
network_first_octet = 100
skip_network_octets = ['127', '169', '172', '192']
compile_regexes = False
def ip_in_dataset(self, ipaddr):
"""There are multiple ways in which an ip address could be handed to us
in a way where we're matching against a previously obfuscated address.
Here, match the ip address to any of the obfuscated addresses we've
already created
"""
for _ip in self.dataset.values():
if str(ipaddr).split('/', maxsplit=1)[0] == _ip.split('/')[0]:
return True
return False
def get(self, item):
"""Ensure that when requesting an obfuscated address, we return a str
object instead of an IPv(4|6)Address object
"""
filt_start = ('/', '=', ']', ')')
if item.startswith(filt_start):
item = item.lstrip(''.join(filt_start))
if item in self.dataset:
return self.dataset[item]
if self.ignore_item(item) or self.ip_in_dataset(item):
return item
# it's not in there, but let's make sure we haven't previously added
# an address with a CIDR notation and we're now looking for it without
# that notation
if '/' not in item:
for key, value in self.dataset.items():
if key.startswith(item):
return value.split('/')[0]
# fallback to the default map behavior of adding it fresh
return self.add(item)
def set_ip_cidr_from_existing_subnet(self, addr):
"""Determine if a given address is in a subnet of an already obfuscated
network and if it is, then set the address' network to the network
object we're tracking. This allows us to match ip addresses with or
without a CIDR notation and maintain proper network relationships.
"""
nets = []
for net in self._networks:
if addr.ip == net.broadcast_address:
addr.network = net
return
if addr.ip in net:
nets.append(net)
# assign the address to the smallest network that was matched. This is
# necessary due to certain files specifying addresses that cause the
# ipaddress library to create artificially huge subnets that will
# include the actual subnets used by the system
if nets:
nets.sort(key=lambda n: n.prefixlen, reverse=True)
addr.network = nets[0]
def sanitize_item(self, item):
"""Given an IP address, sanitize it to an obfuscated network or host
address as appropriate
"""
try:
addr = ipaddress.ip_interface(item)
except ValueError:
# not an IP, add it to the skip list to avoid flooding logs
self.ignore_matches.append(item)
raise
network = addr.network
if str(network.netmask) == '255.255.255.255':
# check to see if this IP is in a subnet of an already obfuscated
# network and if it has, replace the default /32 netmask that
# ipaddress applies to no CIDR-notated addresses
self.set_ip_cidr_from_existing_subnet(addr)
else:
# we have a CIDR notation, so generate an obfuscated network
# address and then generate an IP address within that network's
# range
self.sanitize_network(network)
return self.sanitize_ipaddr(addr)
def sanitize_network(self, network):
"""Obfuscate the network address provided, and if there are host bits
in the address then obfuscate those as well
"""
# check if the address is in a network we've already encountered
if network not in self._networks:
self._new_obfuscated_network(network)
def sanitize_ipaddr(self, addr):
"""Obfuscate the IP address within the known obfuscated network
"""
# get the obfuscated network object
if addr.network in self._networks:
_obf_network = self._networks[addr.network]
# if the plain address is the broadcast address for it's own
# network, then assign the broadcast address for the obfuscated
# network
if addr.ip == addr.network.broadcast_address:
return str(_obf_network.broadcast_address)
# otherwise within that obfuscated network grab the next available
# address from it
for _ip in _obf_network.hosts():
if not self.ip_in_dataset(_ip):
# the ipaddress module does not assign the network's
# netmask to hosts in the hosts() generator for some reason
return f"{str(_ip)}/{_obf_network.prefixlen}"
# ip is a single ip address without the netmask
return self._new_obfuscated_single_address()
def _new_obfuscated_single_address(self):
def _gen_address():
_octets = []
for _ in range(0, 4):
_octets.append(random.randint(11, 99))
return f"{_octets[0]}.{_octets[1]}.{_octets[2]}.{_octets[3]}"
_addr = _gen_address()
if _addr in self.dataset.values():
return self._new_obfuscated_single_address()
return _addr
def _new_obfuscated_network(self, network):
"""Generate an obfuscated network address for the network address given
which will allow us to maintain network relationships without divulging
actual network details
Positional arguments:
:param network: An ipaddress.IPv{4|6)Network object
"""
_obf_network = None
if isinstance(network, ipaddress.IPv4Network):
if self.network_first_octet in self.skip_network_octets:
self.network_first_octet += 1
_obf_address = f"{self.network_first_octet}.0.0.0"
_obf_mask = network.with_netmask.split('/')[1]
_obf_network = ipaddress.IPv4Network(f"{_obf_address}/{_obf_mask}")
self.network_first_octet += 1
if isinstance(network, ipaddress.IPv6Network):
# TODO: define this
pass
if _obf_network:
self._networks[network] = _obf_network
self.dataset[str(network)] = str(_obf_network)