Creating a user name list for brute force attacks.

namemash.py

#!/usr/bin/env python3

'''
NameMash by superkojiman

Generate a list of possible usernames from a person's first and last name. 

https://blog.techorganic.com/2011/07/17/creating-a-user-name-list-for-brute-force-attacks/
'''

import sys
import os.path

if __name__ == '__main__': 
    if len(sys.argv) != 2:
        print(f'usage: {sys.argv[0]} names.txt')
        sys.exit(0)

    if not os.path.exists(sys.argv[1]): 
        print(f'{sys.argv[1]} not found')
        sys.exit(0)

    with open(sys.argv[1]) as f:
        for line in enumerate(f): 

            # remove anything in the name that aren't letters or spaces
            name = ''.join([c for c in line[1] if  c == ' ' or  c.isalpha()])
            tokens = name.lower().split()

            if len(tokens) < 1: 
                # skip empty lines
                continue
            
            # assume tokens[0] is the first name
            fname = tokens[0]

            # remaining elements in tokens[] must be the last name
            lname = ''

            if len(tokens) == 2: 
                # assume traditional first and last name
                # e.g. John Doe
                lname = tokens[-1]

            elif len(tokens) > 2: 
                # assume multi-barrelled surname
                # e.g. Jane van Doe

                # remove the first name
                del tokens[0]

                # combine the multi-barrelled surname
                lname = ''.join([s for s in tokens])

            # create possible usernames
            print(fname + lname)           # johndoe
            print(lname + fname)           # doejohn
            print(fname + '.' + lname)     # john.doe
            print(lname + '.' + fname)     # doe.john
            print(lname + fname[0])        # doej
            print(fname[0] + lname)        # jdoe
            print(lname[0] + fname)        # djoe
            print(fname[0] + '.' + lname)  # j.doe
            print(lname[0] + '.' + fname)  # d.john
            print(fname)                   # john
            print(lname)                   # joe