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block_meP3.py
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block_meP3.py
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#!/usr/bin/python
#BETA untested code
#version: Python 3 ( converted with https://www.pythonconverter.com/ ) not tested.
#Notes: You need to setup a cronjob to run this. Normally running this every 2 minutes will do the job.
#Additional Notes: Many of the commands called are legacy now. 'netstat' is being replaced by 'ss' for example.
import subprocess
import sys
whitelist=['156.119.190.184','156.119.195.42','10.162.61.79','127.0.0.1'] #base whitelist
whitelist.append('149.101.1.118') #DOJ added 8/15/2017
whitelist.append('66.104.15.23') #BNC added 8/25/2017
##############################
#variables to change
##############################
generic_suffix="something.xxx.example"
admin_email="somone@" + generic_suffix # to and from email address
my_host= ecf + "." + generic_suffix
smtp_host="smtp.someplace.xxx.example"
cc1="myemail@" + generic_suffix
cc2="myemail2@" + generic_suffix
carbon_copy_email=[cc1,cc2]
#for x in whitelist:
# print "debug: white listed hosts - " + x
blockvalue=200 #default 2
alertvalue=5
proc = subprocess.Popen("netstat -ntu | awk '{print $5}' | cut -d: -f1 | grep -v '[ervers|ddress]' |sort | uniq -c | sort -n", shell=True,stdout=subprocess.PIPE)
running = proc.stdout.read()
sorted_ips_running = running.split('\n')
#########################################
#functions
#########################################
def block_ip(ip):
#check for valid ip
oct1,oct2,oct3,oct4=ip.split(".")
print("debug blocking " + oct1 + "." + oct2 + "." + oct3 + "." + oct4)
if ( oct1>0 and len(ip)>8):
#print "debug ok4"
print("running firewall block rule...")
mycmd = "/sbin/iptables -I INPUT 1 -s " + ip + " -j DROP"
print(mycmd)
subprocess.Popen(mycmd ,shell=True,stdout=subprocess.PIPE)
#########################################
##################################################
def write_message_to_log(first_part,second_part):
##################################################
print("debug write_message_to_log function\n")
d=get_date("2") #dates with seconds
f = open('/var/tmp/logfile_block_me.txt', 'a')
if first_part=="":
#log entry without colon
line_string = d + "," + str(second_part) + "\n"
else:
line_string = d + ":" + first_part + " " + str(second_part) + "\n"
f.write(line_string)
f.close()
print("debug write message to log finished.\n")
def get_logs_of_connections(ip):
#todo
exit
#########################################
##################################################
def get_date(a):
##################################################
import datetime
if a == "1":
#get date with seconds
now = datetime.datetime.now()
d = now.strftime("%Y-%m-%d_%H:%M:%S ")
##d="2009-12-10" #debug date static
elif a=="2":
now = datetime.datetime.now()
d = now.strftime("%Y-%m-%d,%H:%M:%S")
else:
#regular date for email
d = datetime.date.today() #dyanmic
##d="2009-12-10" #debug date static
#print "debug get_date date is " + str(d)
return str(d) #return as string
##################################################
##################################################
def write_to_mailclient(mycount,ip):
##################################################
print("did we get this far")
import smtplib
import re
cc_list_count=0
cc_header=[] #carbon copy header info for email
for email_address in carbon_copy_email:
cc_list_count=cc_list_count+1
cc_header.append("cc: <" + str(email_address) + ">\r\n")
new_msg=[] #new message
#message header info
fromaddr = ("From: " + my_host + " <" + str(admin_email) + ">" )
toaddr=("To: <" + str(admin_email) + ">" )
print("\t Attempting to send message...\n")
today=get_date("any")
subject="Subject: blocking ip " + ip
total_addrs=[] #mulple email addresses
total_addrs.append(admin_email)
#if we have carbon copy info add it in
if cc_list_count>0:
for cc_email in carbon_copy_email:
total_addrs.append(cc_email)
header= fromaddr + "\r\n"
header= header + toaddr + "\r\n"
if cc_list_count>0:
for cc_email in cc_header:
header= header + cc_email
header= header + subject + "\r\n"
print("debug: (header) " + header)
new_msg = (header + "Hello,\r We detected an LARGE AMOUNT of tcp connections to " + my_host + " There are " + mycount + " connections from " + ip + " so we blocked them.\r\n\r\n")
body=""
body = body + "************************ \r\n"
###########
#add header and subject to the message
###########
body = new_msg + body
###########
#add signiture to mail message
###########
body = body + "##########\r\nUSBC\r\nSystems\r\nTel: 410-962-XXXX\r\n###########"
#####
#end of message
#####
#tmp1=" address " + admin_email
#tmp2=str(len(body)) + " characters"
#write_message_to_log(tmp1,tmp2)
print("\t....Attempting to send the message to " + admin_email)
print("\t....Opening connection to server...\n")
server = smtplib.SMTP(smtp_host)
server.set_debuglevel(1)
print("\t....sending email\n")
server.sendmail(fromaddr, total_addrs, body)
print("\t....attempting to end connection with the server\n")
server.quit()
#########################################
#########################################
#MAIN AREA
#remove whitelisted ips from list
for r in sorted_ips_running:
match=0
con=r.split()
if len(con)==2:
for wip in whitelist:
if wip==con[1]:
#print "match found " + wip + " = " + con[1]
match=1
if match==0:
#print "no match for ip " + con[1]
if int(con[0]) > blockvalue:
#process new firewall rules
tmp1=con[0] + " TCP connections "
tmp2=" from " + con[1]
print("appending values " + tmp1 + ":" + tmp2 + " to list")
tmp3=con[1] + "," + con[0] #format of log file is ALERT,IP
write_message_to_log("BLOCKED",tmp3)
print("sending message " + tmp1 + ":" + tmp2 + " to list")
write_to_mailclient(con[0],con[1])
#send email about blocking before we block it
print("BLOCKING " + str(con[1])+ " - " + str(con[0]))
block_ip(str(con[1]))
elif int(con[0]) > alertvalue:
print("ALERT " + str(con[1])+ " - " + str(con[0]))
a=get_date("2")#standard format
tmp_info="ALERT," + str(con[1])+ "," + str(con[0])
write_message_to_log("",tmp_info)
else:
a=get_date("2")#standard format
print(str(a) + "," + str(con[0]) + ",connections from," + str(con[1]))