/
main.py
175 lines (149 loc) · 5.25 KB
/
main.py
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from pox.core import core
from pox.lib.revent import *
from pox.lib.util import dpidToStr
from pox.lib.addresses import EthAddr, IPAddr
import os
import csv
from threading import Timer
import hashlib as checksum
from rule import Rule
import of_message
import of_match
log = core.getLogger()
class Firewall(EventMixin):
def __init__(self):
self.listenTo(core.openflow)
self.firewall = {}
log.info("*** Starting SDN Firewall ***")
def _handle_ConnectionUp(self, event):
self.connection = event.connection
log.info(
"Switch [ID:" + \
dpidToStr(event.dpid) + \
"] has been successfully " + \
"connected to the controller"
)
rules = self.rulesFilePath("fwRules.csv")
self.addRulesFromFile(rules)
def rulesFilePath(self, rulesFileName):
currentDir = os.path.dirname(__file__)
fwPkgPath = os.path.abspath(currentDir)
fwRulesPath = os.path.join(fwPkgPath, rulesFileName)
return fwRulesPath
def addRulesFromFile(self, rulesFile):
with open(rulesFile, "rb") as rules:
rulesList = csv.reader(rules)
for rule in rulesList:
if '#' in rule[0]:
continue
newRule = Rule(
src = rule[0],
dst = rule[1],
trans_proto = rule[2],
app_proto = rule[3],
expiration = rule[4],
delay = rule[5]
)
ruleID = self.generateRuleID(newRule)
if int(newRule.delay) > 0:
self.activateRuleAfterDelay(newRule, ruleID)
self.removeRuleAfterExpiration(newRule, ruleID)
else:
newRule = self.adjustDelayValue(newRule)
self.addFirewallRule(newRule, ruleID)
def generateRuleID(
self,
rule):
id = checksum.md5()
id.update(rule.src)
id.update(rule.dst)
id.update(rule.trans_proto)
id.update(rule.app_proto)
return id.hexdigest()
def activateRuleAfterDelay(self, newRule, ruleID):
Timer(
int(newRule.delay),
self.addFirewallRule,
[newRule, ruleID]
).start()
def removeRuleAfterExpiration(self, newRule, ruleID):
delayPlusExpiration = int(newRule.delay) + int(newRule.expiration)
Timer(
delayPlusExpiration,
self.delFirewallRule,
[newRule, ruleID]
).start()
def adjustDelayValue(self, newRule):
if int(newRule.delay) > 65535:
newRule.delay = 65535
else:
newRule.delay = 0
return newRule
def addFirewallRule(self, rule, ruleID):
if ruleID in self.firewall:
message = "RULE EXISTS!: drop:"
else:
self.firewall[ruleID] = rule
self.pushRuleToSwitch(rule, action="add")
message = "Rule added: drop:"
message += " id:" + ruleID + " " + str(rule)
log.info(message)
self.showFirewallRules()
def delFirewallRule(self, rule, ruleID):
if ruleID in self.firewall:
del self.firewall[ruleID]
self.pushRuleToSwitch(rule, action="del")
message = "Rule deleted: drop:"
else:
message = "RULE DOESN'T EXIST!: drop:"
message += " id:" + ruleID + " " + str(rule)
log.info(message)
self.showFirewallRules()
def pushRuleToSwitch(self, rule, action):
match = None
message = None
self.createAndSendOFRule(
match, rule,
rule.src, rule.dst,
message, action)
self.createAndSendOFRule(
match, rule,
rule.dst, rule.src,
message, action)
def createAndSendOFRule(self, match, rule, src, dst, message, action):
match = self.createOFMatch(
match, rule, src, dst)
message = self.createOFMsg(message, match.OFMatch, action)
self.connection.send(message.OFMessage)
def createOFMatch(self, match, rule, src, dst, pktType = "IPv4"):
if match == None:
match = of_match.OFMtch().createMatchStruct()
match\
.packetType(pktType)\
.transProto(rule.trans_proto)\
.appProtoDst(rule.app_proto)\
.source(src)\
.destination(dst)
#log.info(match.testAttr)
return match
def createOFMsg(self, msg, match, action, priority = 20, jump = "DROP"):
if msg == None:
msg = of_message.OFMsg().createFlowTableEntry()
msg\
.priority(priority)\
.jump(jump)\
.match(match)\
.addOrDeleteOFRule(action)
#log.info(msg.testAttr)
return msg
def showFirewallRules(self):
message = "\n " + \
"*** LIST OF FIREWALL RULES ***\n\n"
if len(self.firewall) > 0:
for ruleID,rule in self.firewall.items():
message += "id: " + ruleID + " " + str(rule) + "\n"
else:
message += "The list of rules is empty.\n"
log.info(message)
def launch():
core.registerNew(Firewall)