#!/usr/bin/env python
# joescan.py -By Ryan Kulla
# Scans for user accounts who use their username as their password.

from crypt import crypt
from pwd import getpwall, getpwnam
from getpass import getuser

PASSWD_FILE = getpwall()

def get_total_entries():
    total_entries = 0
    for total_entries in range(len(PASSWD_FILE)):
        if PASSWD_FILE[total_entries] == "":
            break
    return total_entries

def display_start_message(total_entries):
    print 'Scans for "joe" accounts',
    print '(accounts with the same username and password.)'
    raw_input('Hit Enter to scan the [%d] accounts found on this system' % total_entries)

def check_if_shadowed():
    cryptedpasswd = getpwnam(getuser())[1]
    if cryptedpasswd in ('x', '*'):
        raise NotImplementedError("Currently no support for shadow passwords")

def scan(total_entries):
    found_joe = False
    i = 0
    while True:
        user = PASSWD_FILE[i][0]
        password = PASSWD_FILE[i][1]
        cryptedpasswd = crypt(user, password)
        if cryptedpasswd == password:
            found_joe = True
            print '\n"%s" is a joe.' % user
        i = i + 1
        if i >= total_entries + 1:
            break

    if not found_joe:
        print "\nNo Joe accounts were found.\n"

if __name__=='__main__':
    total_entries = get_total_entries()
    display_start_message(total_entries)
    check_if_shadowed()
    scan(total_entries);