267 lines
7 KiB
Python
267 lines
7 KiB
Python
#! /usr/bin/env python
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import curses
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import random
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import os
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from fallout_functions import slowWrite
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################## text strings ######################
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HEADER_TEXT = 'ROBCO INDUSTRIES (TM) TERMLINK PROTOCOL'
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################## global "constants" ################
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# number of characters for hex digits and spaces
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CONST_CHARS = 16
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# position of the attempt squares
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SQUARE_X = 19
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SQUARE_Y = 3
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LOGIN_ATTEMPTS = 4
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HEADER_LINES = 5
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# amount of time to pause after correct password input
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LOGIN_PAUSE = 3000
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# starting number for hex generation
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START_HEX = 0xf650
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# list of possible symbols for password hiding
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SYMBOLS = '!@#$%^*()_-+={}[]|\\:;\'",<>./?'
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################## functions #########################
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def generateHex(n):
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"""
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generates n numbers starting at START_HEX and increasing by 12 each time
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"""
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num = START_HEX
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list = []
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for i in xrange(n):
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list.append(num)
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num += 12
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return list
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def getSymbols(n):
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"""
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return n random symbols
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"""
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count = len(SYMBOLS)
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result = ""
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for i in xrange(n):
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result += SYMBOLS[random.randint(0, count - 1)]
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return result
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def getPasswords():
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"""
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Returns an array of strings to be used as the password and the decoys
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"""
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groups = []
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# read from passwords.txt
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with open("passwords.txt") as pwfile:
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for line in pwfile:
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if not line.strip():
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groups.append([])
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elif len(groups) > 0:
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groups[len(groups) - 1].append(line[:-1])
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passwords = groups[random.randint(0, len(groups) - 1)]
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random.shuffle(passwords)
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return passwords
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def getFiller(length, passwords):
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"""
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Return a string of symbols with potential passwords mixed in
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length - the length of the string to create
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passwords - an array of passwords to hide in the symbols
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"""
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filler = getSymbols(length)
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# add the passwords to the symbols
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pwdLen = len(passwords[0])
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pwdCount = len(passwords)
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i = 0
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for pwd in passwords:
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# skip a distance based on total size to cover then place a password
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maxSkip = length / pwdCount - pwdLen
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i += random.randint(maxSkip - 2, maxSkip)
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filler = filler[:i] + pwd + filler[i + pwdLen:]
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i += pwdLen
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return filler
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def initScreen(scr):
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"""
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Fill the screen to prepare for password entry
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scr - curses window returned from curses.initscr()
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"""
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size = scr.getmaxyx()
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height = size[0]
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width = size[1]
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fillerHeight = height - HEADER_LINES
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hexes = generateHex(fillerHeight * 2)
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hexCol1 = hexes[:fillerHeight]
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hexCol2 = hexes[fillerHeight:]
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# generate the symbols and passwords
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fillerLength = width / 2 * fillerHeight
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passwords = getPasswords()
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filler = getFiller(fillerLength, passwords)
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fillerCol1 = filler[:len(filler) / 2]
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fillerCol2 = filler[len(filler) / 2:]
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# each column of symbols and passwords should be 1/4 of the screen
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fillerWidth = width / 4
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# print the header stuff
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slowWrite(scr, HEADER_TEXT)
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slowWrite(scr, '\nENTER PASSWORD NOW\n\n')
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slowWrite(scr, str(LOGIN_ATTEMPTS) + ' ATTEMPT(S) LEFT: ')
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for i in xrange(LOGIN_ATTEMPTS):
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scr.addch(curses.ACS_BLOCK)
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slowWrite(scr, ' ')
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slowWrite(scr, '\n\n')
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# print the hex and filler
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for i in xrange(fillerHeight):
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slowWrite(scr, "0x%X %s" % (hexCol1[i], fillerCol1[i * fillerWidth: (i + 1) * fillerWidth]), 1)
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if i < fillerHeight - 1:
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scr.addstr('\n')
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for i in xrange(fillerHeight):
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scr.move(HEADER_LINES + i, CONST_CHARS / 2 + fillerWidth)
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slowWrite(scr, '0x%X %s' % (hexCol2[i], fillerCol2[i * fillerWidth: (i + 1) * fillerWidth]), 1)
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scr.refresh()
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return passwords
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def moveInput(scr, inputPad):
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"""
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moves the input pad to display all text then a blank line then the cursor
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"""
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size = scr.getmaxyx()
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height = size[0]
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width = size[1]
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inputPad.addstr('\n>')
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# cursor position relative to inputPad
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cursorPos = inputPad.getyx()
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inputPad.refresh(0, 0,
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height - cursorPos[0] - 1,
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width / 2 + CONST_CHARS,
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height - 1,
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width - 1)
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def userInput(scr, passwords):
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"""
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let the user attempt to crack the password
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scr - curses window returned from curses.initscr()
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passwords - array of passwords hidden in the symbols
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"""
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size = scr.getmaxyx()
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height = size[0]
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width = size[1]
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# set up a pad for user input
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inputPad = curses.newpad(height, width / 2 + CONST_CHARS)
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attempts = LOGIN_ATTEMPTS
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# randomly pick a password from the list
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pwd = passwords[random.randint(0, len(passwords) - 1)]
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curses.echo()
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while attempts > 0:
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# move the curser to the correct spot for typing
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scr.move(height - 1, width / 2 + CONST_CHARS + 1)
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# scroll user input up as the user tries passwords
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moveInput(scr, inputPad)
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guess = scr.getstr()
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cursorPos = inputPad.getyx()
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# write under the last line of text
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inputPad.move(cursorPos[0] - 1, cursorPos[1] - 1)
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inputPad.addstr('>' + guess.upper() + '\n')
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# user got password right
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if guess.upper() == pwd.upper():
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inputPad.addstr('>Exact match!\n')
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inputPad.addstr('>Please wait\n')
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inputPad.addstr('>while system\n')
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inputPad.addstr('>is accessed.\n')
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moveInput(scr, inputPad)
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curses.napms(LOGIN_PAUSE)
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return True
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# wrong password
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else:
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pwdLen = len(pwd)
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matched = 0
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try:
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for i in xrange(pwdLen):
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if pwd[i].upper() == guess[i].upper():
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matched += 1
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except IndexError:
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pass # user did not enter enough letters
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inputPad.addstr('>Entry denied\n')
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inputPad.addstr('>' + str(matched) + '/' + str(pwdLen) +
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' correct.\n')
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attempts -= 1
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# show remaining attempts
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scr.move(SQUARE_Y, 0)
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scr.addstr(str(attempts))
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scr.move(SQUARE_Y, SQUARE_X)
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for i in xrange(LOGIN_ATTEMPTS):
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if i < attempts:
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scr.addch(curses.ACS_BLOCK)
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else:
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scr.addstr(' ')
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scr.addstr(' ')
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# Out of attempts
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return False
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def runLogin(scr):
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"""
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Start the login portion of the terminal
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"""
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curses.use_default_colors()
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size = scr.getmaxyx()
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width = size[1]
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height = size[0]
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random.seed()
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# set screen to initial position
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scr.erase()
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scr.move(0, 0)
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passwords = initScreen(scr)
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return userInput(scr, passwords)
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def beginLogin():
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"""
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Initialize curses and start the login process
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Returns true if the user correctly guesses the password
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"""
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return curses.wrapper(runLogin)
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