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Verify a Single User Name and Password in Python (Python recipe) by Captain DeadBones
ActiveState Code (http://code.activestate.com/recipes/578445/)

This script was written for an article I wrote to check user passwords. It stores data using SHA one-way function. For more information Authentication Of Users And Passwords In Python

Python, 40 lines
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import sys
import hashlib
import getpass

def main(argv):

	if len(argv) != 1:
		sys.exit('Usage: user_pass.py <file_name>')

	print '\nUser & Password Authentication Program v.01\n'

	try:
		file_conn = open(sys.argv[1])
		user_name = file_conn.readline()[:-1]
		password = file_conn.readline()[:-1]
		file_conn.close()
	except:
		sys.exit('There was a problem reading the file!')
		
	pass_try = 0 
	x = 3
	
	if raw_input('Please Enter User Name: ') != user_name:
		sys.exit('Incorrect User Name, terminating... \n')
	
	while pass_try < x:
		user_input = hashlib.sha224(getpass.getpass('Please Enter Password: ')).hexdigest()
		if user_input != password:
			pass_try += 1
			print 'Incorrect Password, ' + str(x-pass_try) + ' more attemts left\n'
		else:
			pass_try = x+1
			
	if pass_try == x and user_input != password:
		sys.exit('Incorrect Password, terminating... \n')

	print 'User is logged in!\n'		
			
if __name__ == "__main__":
	main(sys.argv[1:])
Tags: password, python, usernames