/usr/lib/python3/dist-packages/setools/nodeconquery.py is in python3-setools 4.1.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | # Copyright 2014-2015, Tresys Technology, LLC
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools. If not, see
# <http://www.gnu.org/licenses/>.
#
try:
import ipaddress
except ImportError: # pragma: no cover
pass
import logging
from socket import AF_INET, AF_INET6
from .mixins import MatchContext
from .policyrep import NodeconIPVersion
from .query import PolicyQuery
class NodeconQuery(MatchContext, PolicyQuery):
"""
Query nodecon statements.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
network The IPv4/IPv6 address or IPv4/IPv6 network address
with netmask, e.g. 192.168.1.0/255.255.255.0 or
"192.168.1.0/24".
network_overlap If true, the net will match if it overlaps with
the nodecon's network instead of equality.
ip_version The IP version of the nodecon to match. (socket.AF_INET
for IPv4 or socket.AF_INET6 for IPv6)
user The criteria to match the context's user.
user_regex If true, regular expression matching
will be used on the user.
role The criteria to match the context's role.
role_regex If true, regular expression matching
will be used on the role.
type_ The criteria to match the context's type.
type_regex If true, regular expression matching
will be used on the type.
range_ The criteria to match the context's range.
range_subset If true, the criteria will match if it is a subset
of the context's range.
range_overlap If true, the criteria will match if it overlaps
any of the context's range.
range_superset If true, the criteria will match if it is a superset
of the context's range.
range_proper If true, use proper superset/subset operations.
No effect if not using set operations.
"""
_network = None
network_overlap = False
_ip_version = None
@property
def ip_version(self):
return self._ip_version
@ip_version.setter
def ip_version(self, value):
if value:
self._ip_version = NodeconIPVersion.lookup(value)
else:
self._ip_version = None
@property
def network(self):
return self._network
@network.setter
def network(self, value):
if value:
try:
self._network = ipaddress.ip_network(value)
except NameError: # pragma: no cover
raise RuntimeError("Nodecon IP address/network functions require Python 3.3+.")
else:
self._network = None
def __init__(self, policy, **kwargs):
super(NodeconQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self):
"""Generator which yields all matching nodecons."""
self.log.info("Generating nodecon results from {0.policy}".format(self))
self.log.debug("Network: {0.network!r}, overlap: {0.network_overlap}".format(self))
self.log.debug("IP Version: {0.ip_version!r}".format(self))
self._match_context_debug(self.log)
for nodecon in self.policy.nodecons():
if self.network:
try:
netmask = ipaddress.ip_address(nodecon.netmask)
except NameError: # pragma: no cover
# Should never actually hit this since the self.network
# setter raises the same exception.
raise RuntimeError("Nodecon IP address/network functions require Python 3.3+.")
# Python 3.3's IPv6Network constructor does not support
# expanded netmasks, only CIDR numbers. Convert netmask
# into CIDR.
# This is Brian Kernighan's method for counting set bits.
# If the netmask happens to be invalid, this will
# not detect it.
CIDR = 0
int_netmask = int(netmask)
while int_netmask:
int_netmask &= int_netmask - 1
CIDR += 1
net = ipaddress.ip_network('{0}/{1}'.format(nodecon.address, CIDR))
if self.network_overlap:
if not self.network.overlaps(net):
continue
else:
if not net == self.network:
continue
if self.ip_version and self.ip_version != nodecon.ip_version:
continue
if not self._match_context(nodecon.context):
continue
yield nodecon
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