Little changes - Githubissues

Hi,

I was using your tool on a big AD (around 20 000 hosts) and I had to debug some functions because I had stacktraces like these ones:

When data is empty, data.index fails

Process UserHunterWorker-1:
Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/home/test/pywerview/pywerview/worker/hunting.py", line 43, in run
result = self._hunt(target_computer)
File "/home/test/pywerview/pywerview/worker/hunting.py", line 63, in _hunt
self._lmhash, self._nthash) as net_requester:
File "/home/test/pywerview/pywerview/requester.py", line 273, in __enter__
LDAPRequester.__enter__(self)
File "/home/test/pywerview/pywerview/requester.py", line 144, in __enter__
self._create_ldap_connection()
File "/home/test/pywerview/pywerview/requester.py", line 62, in _create_ldap_connection
queried_domain = self._get_netfqdn()
File "/home/test/pywerview/pywerview/requester.py", line 50, in _get_netfqdn
smb.login('', '')
File "/usr/local/lib/python2.7/dist-packages/impacket/smbconnection.py", line 258, in login
return self._SMBConnection.login(user, password, domain, lmhash, nthash, ntlmFallback)
File "/usr/local/lib/python2.7/dist-packages/impacket/smb.py", line 3376, in login
self.login_extended(user, password, domain, lmhash, nthash, use_ntlmv2 = True)
File "/usr/local/lib/python2.7/dist-packages/impacket/smb.py", line 3252, in login_extended
sessionData.fromString(sessionResponse['Data'])
File "/usr/local/lib/python2.7/dist-packages/impacket/structure.py", line 140, in fromString
size = self.calcUnpackSize(field[1], data, field[0])
File "/usr/local/lib/python2.7/dist-packages/impacket/structure.py", line 462, in calcUnpackSize
return self.calcUnpackSize(two[0], data)
File "/usr/local/lib/python2.7/dist-packages/impacket/structure.py", line 494, in calcUnpackSize
return data.index('\x00')+1
ValueError: substring not found

Another one:

Process UserHunterWorker-7:
Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/home/joe/pywerview/pywerview/worker/hunting.py", line 43, in run
result = self._hunt(target_computer)
File "/home/joe/pywerview/pywerview/worker/hunting.py", line 65, in _hunt
distant_sessions += net_requester.get_netsession()
TypeError: 'NoneType' object is not iterable

So to correct it, at first I tried to debug it but I finally add this check and return empty value if it fails. I had no more stacktrace.

Another problem I had, it's on big AD, the request (invoke-userhunter) could take a while, so it's difficult to know if the tool is working or not so I added some prints and a progress bar to know the elapsed time. If you want to remove it, no problem, but please add some verbose options.

I wanted to improve the elapsed time, that's why I added a timeout here but I doesn't change a lot.

Hope it will help. Have a nice day and thanks for your work !

the-useless-one / pywerview

Little changes #27