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check_nmap
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#!/usr/bin/env python3
#-------------------------------------------------------------------------------
import os
import sys
import subprocess
import argparse
import socket
#-------------------------------------------------------------------------------
_candebug = False
def candebug():
global _candebug
return _candebug
def setcandebug(value):
global _candebug
_candebug = value
def infomsg(msg):
if candebug() == True:
print(msg, flush=True)
def exitnagios(status,message):
if status=="OK":
exitcode = 0
elif status=="WARNING":
exitcode = 1
elif status=="CRITICAL":
exitcode = 2
elif status=="UNKNOWN":
exitcode = 3
else:
exitcode = 4
print(status+": "+message, flush=True)
sys.exit(exitcode)
#-------------------------------------------------------------------------------
original_getaddrinfo = socket.getaddrinfo
def forced_ipv6_gai_family(*args, **kwargs):
global original_getaddrinfo
responses = original_getaddrinfo(*args, **kwargs)
return [response
for response in responses
if response[0] == socket.AF_INET6]
def forced_ipv4_gai_family(*args, **kwargs):
global original_getaddrinfo
responses = original_getaddrinfo(*args, **kwargs)
return [response
for response in responses
if response[0] == socket.AF_INET]
#-------------------------------------------------------------------------------
def processservice(port,status,service,expectedservice,exitstatus):
if expectedservice=="":
exitnagios(exitstatus,"Port is "+status+" and found service "+service+" listening on port "+str(port)+" - no expeced service specified")
elif service==expectedservice:
exitnagios(exitstatus,"Port is "+status+" and found service "+service+" listening on port "+str(port)+" - and the expeced service matches")
elif service=="unknown":
exitnagios("CRITICAL","Port is "+status+" but unknown service listening on port "+str(port)+" - it was expected "+expectedservice)
else:
exitnagios("WARNING","Port is "+status+" but incorrect service "+service+" listening on port "+str(port)+" - it was expected "+expectedservice)
def donmapcall(protocol,mode,hostname,port,expectedservice,expectedresponse,filteredstatus,timeoutvalue,timeoutstatus):
parts=4
initial_rtt=str(int(round(timeoutvalue/parts)))+"s"
max_rtt=str(int(round(timeoutvalue/parts)))+"s"
# https://nmap.org/book/man-host-discovery.html
if mode == "udp":
sflag = "-sU"
pflag = "" # "-PU"
if mode == "tcp":
sflag = "-sS"
pflag = "" # "-PS" #
command=["/usr/bin/nmap"]
if protocol != "":
command = command+[protocol]
command = command+["--privileged",sflag,pflag,"--discovery-ignore-rst","-p",str(port),hostname,"--initial-rtt-timeout",initial_rtt,"--max-rtt-timeout",max_rtt]
infomsg(" ".join(command))
result = subprocess.run(command,capture_output=True)
output = result.stdout.decode("utf-8").strip()
errors = result.stderr.decode("utf-8").strip()
response = ""
for line in output.splitlines():
if line.startswith(str(port)+"/"+mode):
response = line
infomsg(response)
if response != "":
try:
parts = response.split()
status = parts[1]
service = parts[2]
infomsg("The response is '"+status+"' and it was expected '"+expectedresponse+"'")
if expectedresponse=="open":
if status=="open":
processservice(port,status,service,expectedservice,"OK")
elif status=="open|filtered":
processservice(port,status,service,expectedservice,"WARNING")
elif status=="filtered":
processservice(port,status,service,expectedservice,filteredstatus)
elif status=="closed":
exitnagios("CRITICAL","Port "+str(port)+" is filtered instead of open")
else:
exitnagios("CRITICAL","cannot map status")
elif expectedresponse=="open+filtered":
if status=="open":
processservice(port,status,service,expectedservice,"WARNING")
elif status=="open|filtered":
processservice(port,status,service,expectedservice,"OK")
elif status=="filtered":
processservice(port,status,service,expectedservice,filteredstatus)
elif status=="closed":
exitnagios("CRITICAL","Port "+str(port)+" is closed instead of open+filtered")
else:
exitnagios("CRITICAL","cannot map status")
elif expectedresponse=="filtered":
if status=="open":
processservice(port,status,service,expectedservice,"WARNING")
elif status=="open|filtered":
processservice(port,status,service,expectedservice,"WARNING")
elif status=="filtered":
processservice(port,status,service,expectedservice,"OK")
elif status=="closed":
exitnagios("CRITICAL","Port "+str(port)+" is closed instead of filtered")
else:
exitnagios("CRITICAL","cannot map status")
elif expectedresponse=="notclosed":
if status=="open":
processservice(port,status,service,expectedservice,"OK")
elif status=="open|filtered":
processservice(port,status,service,expectedservice,"OK")
elif status=="filtered":
processservice(port,status,service,expectedservice,"OK")
elif status=="closed":
exitnagios("CRITICAL","Port "+str(port)+" is closed instead of notclosed")
else:
exitnagios("CRITICAL","cannot map status")
elif expectedresponse=="closed":
if status=="open":
exitnagios("CRITICAL","Port "+str(port)+" is reacheable (open)")
elif status=="open|filtered":
exitnagios("CRITICAL","Port "+str(port)+" is reacheable (open+filtered)")
elif status=="filtered":
exitnagios("WARNING","Port "+str(port)+" is reacheable (filtered)")
elif status=="closed":
exitnagios("OK","Port "+str(port)+" is closed")
else:
exitnagios("CRITICAL","cannot map status")
else:
exitnagios("CRITICAL","unexpected response "+expectedresponse)
except Exception as e:
exitnagios("CRITICAL","exception - "+str(e))
else:
exitnagios(timeoutstatus,"nmap respose is empty for command '"+" ".join(command)+"'")
exitnagios("CRITICAL","unexpected scenario")
#-------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser()
parser.add_argument("-4", "--ipv4", action="store_true", dest="ipv4", default=False, help="use ipv4 (exclusive with ipv6)")
parser.add_argument("-6", "--ipv6", action="store_true", dest="ipv6", default=False, help="use ipv6 (exclusive with ipv4)")
parser.add_argument("-0", "--ipv0", action="store_true", dest="ipv0", default=False, help="do not specify ip protocol version")
parser.add_argument("-H", "--hostname", dest="hostname", default="", help="server to check")
parser.add_argument("-m", "--mode", dest="mode", default="", help="mode TCP/UDP")
parser.add_argument("-p", "--port", dest="port", default="" , help="port number to check")
parser.add_argument("-s", "--service", dest="service", default="", help="Name of the service that should be listening on the port")
parser.add_argument("-r", "--response", dest="response", default="notclosed", help="respose: open,filtered,open+filtered,notclosed,closed")
parser.add_argument("-f", "--filtered", dest="filtered", default="WARNING", help="OK,WARNING,CRITICAL,UNKNOWN")
parser.add_argument("-t", "--timeout", dest="timeout", default="30:CRITICAL", help="timeout value:STATUS")
parser.add_argument("-®", "--debug", action="store_true", dest="debug", default=False, help="be more verbose")
args = parser.parse_args()
setcandebug(args.debug)
protocol = None
exclist = 0
if args.ipv0 == True :
protocol = ""
exclist = exclist+1
if args.ipv4 == True :
protocol = "-4"
exclist = exclist+1
socket.getaddrinfo = forced_ipv4_gai_family
if args.ipv6 == True :
protocol = "-6"
exclist = exclist+1
socket.getaddrinfo = forced_ipv6_gai_family
if (exclist>1) :
exitnagios("CRITICAL","select ip protocol version 4 or 6, or 0 to relay on OS handling")
elif (exclist<1) :
exitnagios("CRITICAL","no protocol selected")
if (args.hostname == ""):
exitnagios("CRITICAL","hostname not defined")
if (args.mode == ""):
exitnagios("CRITICAL","mode not defined")
if (args.port == ""):
exitnagios("CRITICAL","port not defined")
if args.filtered not in ["OK", "WARNING", "CRITICAL", "UNKNOWN"]:
exitnagios("CRITICAL","filtered status is not valid")
parts = args.timeout.split(":")
timeoutvalue = int(parts[0])
if len(parts)>1:
timeoutstatus = parts[1]
else:
timeoutstatus = "CRITICAL"
if timeoutstatus not in ["OK", "WARNING", "CRITICAL", "UNKNOWN"]:
exitnagios("CRITICAL","timeout status is not valid")
donmapcall(protocol,args.mode,args.hostname,int(args.port),args.service,args.response,args.filtered,timeoutvalue,timeoutstatus)
if __name__ == "__main__":
main()
#-------------------------------------------------------------------------------