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#!/usr/bin/python
# Copyright (c) 2012, 2013, Intel Corporation
# Copyright (c) 2009 David Wolinsky <davidiw@ufl.edu), University of Florida
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import socket,fcntl, struct, thread
import os.path
import sys
SMACKFS_LOAD="/sys/fs/smackfs/load2"
SMACKFS_NETLABEL="/sys/fs/smackfs/netlabel"
SIOCGIFADDR = 0x8915
SIOCGIFNETMASK = 0x891b
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return fcntl.ioctl(s.fileno(), SIOCGIFADDR,
struct.pack('256s', ifname.encode("utf-8")))[20:24]
def get_netmask(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return fcntl.ioctl(s.fileno(), SIOCGIFNETMASK,
struct.pack('256s', ifname.encode("utf-8")))[20:24]
def applynetlabeltags(interface, addr):
if not interface.startswith("lo"):
bmask = get_netmask(interface.encode("utf-8"))
prefix = bin(struct.unpack(">L", bmask)[0]).count("1")
tags = [
addr+"/"+str(prefix)+" Network::Local\n",
"0.0.0.0/0 Network::Cloud\n",
"127.0.0.1/8 -CIPSO\n"]
smackfs_netlabel(tags)
def loadnetlabelrules():
rulesSystem = [
"System Network::Cloud w\n",
"System Network::Local w\n",
"Network::Cloud System w\n",
"Network::Local System w\n"]
smackfs_load2(rulesSystem)
def smackfs_load2 (rules):
with open(SMACKFS_LOAD, "w") as load2:
for rule in rules:
load2.write(rule)
def smackfs_netlabel (tags):
for tag in tags:
with open(SMACKFS_NETLABEL, "w") as netlabel:
netlabel.write(tag)
"""
Source of: Class ip monitor, and other functions named bellow.
Original author: David Wolinsky <davidiw@ufl.edu
Copied from: https://github.com/davidiw/Grid-Appliance/blob/master/scripts/ip_monitor.py
"""
"""4 byte alignment"""
def align(inc):
diff = inc % 4
return inc + ((4 - diff) % 4)
class ifaddr:
"""Parse an ifaddr packet"""
LOCAL = 2
LABEL = 3
def __init__(self, packet):
self.family, self.prefixlen, self.flags, self.scope, self.index = \
struct.unpack("BBBBI", packet[:8])
class rtattr:
"""Parse a rtattr packet"""
GRP_IPV4_IFADDR = 0x10
NEWADDR = 20
DELADDR = 21
GETADDR = 22
def __init__(self, packet):
self.len, self.type = struct.unpack("HH", packet[:4])
if self.type == ifaddr.LOCAL:
addr = struct.unpack("BBBB", packet[4:self.len])
self.payload = "%s.%s.%s.%s" % (addr[0], addr[1], addr[2], addr[3])
elif self.type == ifaddr.LABEL:
self.payload = packet[4:self.len].strip("\0")
else:
self.payload = packet[4:self.len]
class netlink:
"""Parse a netlink packet"""
REQUEST = 1
ROOT = 0x100
MATCH = 0x200
DONE = 3
def __init__(self, packet):
self.msglen, self.msgtype, self.flags, self.seq, self.pid = \
struct.unpack("IHHII", packet[:16])
self.ifa = None
try:
self.ifa = ifaddr(packet[16:24])
except:
return
self.rtas = {}
pos = 24
while pos < self.msglen:
try:
rta = rtattr(packet[pos:])
except:
break
pos += align(rta.len)
self.rtas[rta.type] = rta.payload
class ip_monitor:
def __init__(self, callback = None):
if callback == None:
callback = self.print_cb
self._callback = callback
def print_cb(self, label, addr):
print (label + " => " + addr)
def request_addrs(self, sock):
sock.send(struct.pack("IHHIIBBBBI", 24, rtattr.GETADDR, \
netlink.REQUEST | netlink.ROOT | netlink.MATCH, 0, sock.getsockname()[0], \
socket.AF_INET, 0, 0, 0, 0))
def start_thread(self):
thread.start_new_thread(self.run, ())
def run(self):
sock = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, socket.NETLINK_ROUTE)
sock.bind((0, rtattr.GRP_IPV4_IFADDR))
self.request_addrs(sock)
while True:
data = sock.recv(4096)
pos = 0
while pos < len(data):
nl = netlink(data[pos:])
if nl.msgtype == netlink.DONE:
break
pos += align(nl.msglen)
if nl.msgtype != rtattr.NEWADDR:
continue
self._callback(nl.rtas[ifaddr.LABEL], nl.rtas[ifaddr.LOCAL])
def main():
if not os.path.isfile(SMACKFS_LOAD):
print ("Smack not found.")
return -1
loadnetlabelrules()
ip_monitor(applynetlabeltags).run()
if __name__ == "__main__":
main()
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