includes/clientside/static/pwstrength.js
author Dan
Sun, 21 Oct 2007 21:26:11 -0400
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permissions -rw-r--r--
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Copyright (C) 2006-2007 Dan Fuhry
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 * pwstrength - Password evaluation and strength testing algorithm
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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function password_score_len(password)
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{
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  if ( typeof(password) != "string" )
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  {
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    return -10;
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  }
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  var len = password.length;
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  var score = len - 7;
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  return score;
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}
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function password_score(password)
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{
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  if ( typeof(password) != "string" )
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  {
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    return -10;
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  }
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  var score = 0;
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  var debug = [];
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  // length check
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  var lenscore = password_score_len(password);
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  debug.push(''+lenscore+' points for length');
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  score += lenscore;
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  var has_upper_lower = false;
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  var has_symbols     = false;
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  var has_numbers     = false;
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  // contains uppercase and lowercase
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  if ( password.match(/[A-z]+/) && password.toLowerCase() != password )
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  {
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    score += 1;
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    has_upper_lower = true;
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    debug.push('1 point for having uppercase and lowercase');
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  }
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  // contains symbols
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  if ( password.match(/[^A-z0-9]+/) )
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  {
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    score += 1;
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    has_symbols = true;
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    debug.push('1 point for having nonalphanumeric characters (matching /[^A-z0-9]+/)');
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  }
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  // contains numbers
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  if ( password.match(/[0-9]+/) )
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  {
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    score += 1;
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    has_numbers = true;
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    debug.push('1 point for having numbers');
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  }
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  if ( has_upper_lower && has_symbols && has_numbers && password.length >= 9 )
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  {
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    // if it has uppercase and lowercase letters, symbols, and numbers, and is of considerable length, add some serious points
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    score += 4;
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    debug.push('4 points for having uppercase and lowercase, numbers, and nonalphanumeric and being more than 8 characters');
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  }
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  else if ( has_upper_lower && has_symbols && has_numbers && password.length >= 6 )
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  {
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    // still give some points for passing complexity check
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    score += 2;
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    debug.push('2 points for having uppercase and lowercase, numbers, and nonalphanumeric');
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  }
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  else if(( ( has_upper_lower && has_symbols ) ||
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            ( has_upper_lower && has_numbers ) ||
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            ( has_symbols && has_numbers ) ) && password.length >= 6 )
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  {
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    // if 2 of the three main complexity checks passed, add a point
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    score += 1;
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    debug.push('1 point for having 2 of 3 complexity checks');
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  }
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  else if ( ( !has_upper_lower && !has_numbers && has_symbols ) ||
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            ( !has_upper_lower && !has_symbols && has_numbers ) ||
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            ( !has_numbers && !has_symbols && has_upper_lower ) )
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  {
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    score += -2;
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    debug.push('-2 points for only meeting 1 complexity check');
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  }
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  else if ( password.match(/^[0-9]*?([a-z]+)[0-9]?$/) )
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  {
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    // password is something like magnum1 which will be cracked in seconds
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    score += -4;
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    debug.push('-4 points for being of the form [number][word][number], which is easily cracked');
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  }
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  else if ( !has_upper_lower && !has_numbers && !has_symbols )
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  {
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    // this is if somehow the user inputs a password that doesn't match the rule above, but still doesn't contain upper and lowercase, numbers, or symbols
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    debug.push('-3 points for not meeting any complexity checks');
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    score += -3;
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  }
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  //
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  // Repetition
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  // Example: foobar12345 should be deducted points, where f1o2o3b4a5r should be given points
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  // None of the positive ones kick in unless the length is at least 8
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  //
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  if ( password.match(/([A-Z][A-Z][A-Z][A-Z]|[a-z][a-z][a-z][a-z])/) )
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  {
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    debug.push('-2 points for having more than 4 letters of the same case in a row');
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    score += -2;
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  }
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  else if ( password.match(/([A-Z][A-Z][A-Z]|[a-z][a-z][a-z])/) )
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  {
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    debug.push('-1 points for having more than 3 letters of the same case in a row');
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    score += -1;
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  }
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  else if ( password.match(/[A-z]/) && !password.match(/([A-Z][A-Z][A-Z]|[a-z][a-z][a-z])/) && password.length >= 8 )
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  {
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    debug.push('1 point for never having more than 2 letters of the same case in a row');
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    score += 1;
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  }
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  if ( password.match(/[0-9][0-9][0-9][0-9]/) )
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  {
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    debug.push('-2 points for having 4 or more numbers in a row');
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    score += -2;
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  }
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  else if ( password.match(/[0-9][0-9][0-9]/) )
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  {
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    debug.push('-1 points for having 3 or more numbers in a row');
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    score += -1;
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  }
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  else if ( has_numbers && !password.match(/[0-9][0-9][0-9]/) && password.length >= 8 )
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  {
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    debug.push('1 point for never more than 2 numbers in a row');
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    score += -1;
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  }
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  // make passwords like fooooooooooooooooooooooooooooooooooooo totally die by subtracting a point for each character repeated at least 3 times in a row
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  var prev_char = '';
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  var warn = false;
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  var loss = 0;
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  for ( var i = 0; i < password.length; i++ )
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  {
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    var chr = password.substr(i, 1);
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    if ( chr == prev_char && warn )
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    {
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      loss += -1;
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    }
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    else if ( chr == prev_char && !warn )
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    {
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      warn = true;
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    }
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    else if ( chr != prev_char && warn )
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    {
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      warn = false;
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    }
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    prev_char = chr;
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  }
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  if ( loss < 0 )
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  {
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    debug.push(''+loss+' points for immediate character repetition');
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    score += loss;
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    // this can bring the score below -10 sometimes
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    if ( score < -10 )
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    {
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      debug.push('Score set to -10 because it went below that floor');
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      score = -10;
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    }
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  }
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  var debug_txt = "<b>How this score was calculated</b>\nYour score was tallied up based on an extensive algorithm which outputted\nthe following scores based on traits of your password. Above you can see the\ncomposite score; your individual scores based on certain tests are below.\n\nThe scale is open-ended, with a minimum score of -10. 10 is very strong, 4\nis strong, 1 is good and -3 is fair. Below -3 scores \"Weak.\"\n\n";
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  for ( var i = 0; i < debug.length; i++ )
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  {
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    debug_txt += debug[i] + "\n";
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  }
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  if ( window.console )
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    window.console.info(debug_txt);
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  else if ( document.getElementById('passdebug') )
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    document.getElementById('passdebug').innerHTML = debug_txt;
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  return score;
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}
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function password_score_draw(score)
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{
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  // some colors are from the Gmail sign-up form
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  if ( score >= 10 )
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  {
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    var color = '#000000';
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    var fgcolor = '#666666';
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    var str = 'Very strong (score: '+score+')';
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  }
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  else if ( score > 3 )
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  {
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    var color = '#008000';
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    var fgcolor = '#004000';
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    var str = 'Strong (score: '+score+')';
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  }
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  else if ( score >= 1 )
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  {
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    var color = '#6699cc';
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    var fgcolor = '#4477aa';
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    var str = 'Good (score: '+score+')';
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  }
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  else if ( score >= -3 )
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  {
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    var color = '#f5ac00';
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    var fgcolor = '#ffcc33';
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    var str = 'Fair (score: '+score+')';
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  }
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  else
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  {
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    var color = '#aa0033';
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    var fgcolor = '#FF6060';
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    var str = 'Weak (score: '+score+')';
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  }
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  return {
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    color: color,
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    fgcolor: fgcolor,
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    str: str
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  };
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}
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function password_score_field(field)
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{
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  var indicator = false;
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  if ( field.nextSibling )
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  {
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    if ( field.nextSibling.className == 'password-checker' )
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    {
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      indicator = field.nextSibling;
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    }
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  }
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  if ( !indicator )
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  {
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    var indicator = document.createElement('span');
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    indicator.className = 'password-checker';
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    if ( field.nextSibling )
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    {
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      field.parentNode.insertBefore(indicator, field.nextSibling);
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    }
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    else
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    {
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      field.parentNode.appendChild(indicator);
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    }
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  }
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  var score = password_score(field.value);
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  var data = password_score_draw(score);
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  indicator.style.color = data.color;
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  indicator.style.fontWeight = 'bold';
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  indicator.innerHTML = ' ' + data.str;
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  if ( document.getElementById('pwmeter') )
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  {
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    var div = document.getElementById('pwmeter');
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    div.style.width = '250px';
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    score += 10;
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    if ( score > 25 )
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      score = 25;
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    div.style.backgroundColor = data.color;
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    var width = Math.round( score * (250 / 25) );
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    div.innerHTML = '<div style="width: '+width+'px; background-color: '+data.fgcolor+'; height: 8px;"></div>';
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  }
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}
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