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Login and Logout using Sessions and Cookies

Discussion in 'PHP' started by shabbir, Jun 15, 2005.

  1. wq321

    wq321 New Member

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    how do i validate this log in code with an access database?
     
  2. shabbir

    shabbir Administrator Staff Member

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    You already have a thread relating to the same and we will have discussion relating to that there.

    [thread=3899]login with access database[/thread]
     
  3. ted_chou12

    ted_chou12 New Member

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    One problem that I found out when using this script, please see the yellow text:
    PHP:
    <?php 

    function createsessions($username,$password

        
    //Add additional member to Session array as per requirement 
        
    session_register(); 

        
    $_SESSION["gdusername"] = $username
        
    $_SESSION["gdpassword"] = md5($password); 
         
        if(isset(
    $_POST['remme'])) 
        { 
            
    //Add additional member to cookie array as per requirement 
            
    setcookie("gdusername"$_SESSION['gdusername'], time()+60*60*24*100"/"); 
            
    setcookie("gdpassword"$_SESSION['gdpassword'], time()+60*60*24*100"/"); //the cookie is stored improperly, and this should be $password instead of [URL=http://www.go4expert.com/articles/md5-tutorial-t319/]md5[/URL] coded password*************************************
            
    return; 
        } 


    function 
    clearsessionscookies() 

        unset(
    $_SESSION['gdusername']); 
        unset(
    $_SESSION['gdpassword']); 
         
        
    session_unset();     
        
    session_destroy(); 

        
    setcookie ("gdusername""",time()-60*60*24*100"/"); 
        
    setcookie ("gdpassword""",time()-60*60*24*100"/"); 


    function 
    confirmUser($username,$password

        
    $md5pass md5($password); //this causes problem when working with md5 coded password already.

        /* Validate from the database but as for now just demo username and password */ 
        
    if($username == "demo" && $password "demo"
            return 
    true
        else 
            return 
    false


    function 
    checkLoggedin() 

        if(isset(
    $_SESSION['gdusername']) AND isset($_SESSION['gdpassword'])) 
            return 
    true
        elseif(isset(
    $_COOKIE['gdusername']) && isset($_COOKIE['gdpassword'])) 
        { 
            if(
    confirmUser($_COOKIE['gdusername'],$_COOKIE['gdpassword'])) 
            { 
                
    createsessions($_COOKIE['gdusername'],$_COOKIE['gdpassword']); 
                return 
    true
            } 
            else 
            { 
                
    clearsessionscookies(); 
                return 
    false
            } 
        } 
        else 
            return 
    false

    ?> 
    Since cookie is already stored as md5, and you are encrypting it twice, therefore the passwords will not match with that from the db. I found this problem when using the script and thought it was the problem of my server. Please make this change if you are using it, and I have to admit, this is a nice login script, very neat and clean.
    Hope that helped. >> NetFriending.com <<
    Ted
     
  4. shabbir

    shabbir Administrator Staff Member

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    That was the same or similar mistake pointed out and as confirmUser is called always with encrypted password now we can safely remove that line. I am removed it. Thanks for pointing it out.
     
  5. ted_chou12

    ted_chou12 New Member

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    opps, is this mistake already being mentioned by somebody?
     
  6. shabbir

    shabbir Administrator Staff Member

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    The variable was anyway not needed but kept there.
     
  7. saimt

    saimt New Member

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    hello shabbir when i'm tring to use the code its giveing me an error of
    the header file already sent ...

    could u please help me
     
  8. pradeep

    pradeep Team Leader

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    Solution:
    At the starting of the file put this code
    PHP:
    ob_start();
     
  9. gary4s

    gary4s New Member

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    Hi all

    Great site. I have tried this script and it works great. I am a newbie to php and would like some pointers on how to validate username and password from the database.

    Thanks Gary
     
  10. pradeep

    pradeep Team Leader

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    What database are you using??
     
  11. Tigerplug

    Tigerplug New Member

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    Thanks for this! It'll be a big help for me!
    I find it so much easier to understand when I step through the code logically and try to understand it.


    ;)
     
  12. new_en_it

    new_en_it New Member

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    keep it up, very good.
     
  13. Ryzer

    Ryzer New Member

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    question about the loginlogout.zip file. i downloaded the file and for some reason login.php won't run. keep getting a parse error in last line of file. makes me think that theres a missing } or ;... but everything looks good. when i comment out the switch function, the error disappears.. anyone else getting this? very confused
     
  14. shabbir

    shabbir Administrator Staff Member

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    Do you get the same error when using the code posted in the Article ?
     
  15. Ryzer

    Ryzer New Member

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    yes, same error with the code from article. i know enough about php to troubleshoot error's and correct most of them but this one has me stumped
     
  16. shabbir

    shabbir Administrator Staff Member

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    The code works for me perfectly fine.
     
  17. Ryzer

    Ryzer New Member

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    the error outputted in localhost/login.php
    Parse error: parse error in FILE PATH HERE on line 81

    login.php - line 81 being the very last line in this file
    Code:
    <?php 
    
    ob_start(); 
    session_start(); 
    
    require_once ("functions.php"); 
    
    $returnurl = urlencode(isset($_GET["returnurl"])?$_GET["returnurl"]:""); 
    if($returnurl == "") 
        $returnurl = urlencode(isset($_POST["returnurl"])?$_POST["returnurl"]:""); 
    
    $do = isset($_GET["do"])?$_GET["do"]:""; 
    
    $do = strtolower($do); 
    
    switch($do) 
    { 
    case "": 
        if (checkLoggedin()) 
        { 
            echo "<H1>You are already logged in - <A href = \"login.php?do=logout\">logout</A></h1>"; 
        } 
        else 
        { 
            ?> 
            <form NAME="login1" ACTION="login.php?do=login" METHOD="POST" ONSUBMIT="return aValidator();"> 
            <input TYPE="hidden" name="returnurl" value="<?$returnurl?>"> 
            <TABLE cellspacing="3"> 
            <TR> 
                <TD>Username:</TD> 
                <TD><input TYPE="TEXT" NAME="username"></TD> 
                <TD>Password:</TD> 
                <TD><input TYPE="PASSWORD" NAME="password"></TD> 
            </TR> 
            <TR> 
                <TD colspan="4" ALIGN="center"><input TYPE="CHECKBOX" NAME="remme">&nbsp;Remember me for the next time I visit</TD> 
            </TR> 
            <TR> 
                <TD ALIGN="CENTER" COLSPAN="4"><input TYPE="SUBMIT" name="submit" value="Login"></TD> 
            </TR> 
            </form> 
            </TABLE> 
        <? 
        } 
        break; 
    case "login": 
        $username = isset($_POST["username"])?$_POST["username"]:""; 
        $password = isset($_POST["password"])?$_POST["password"]:""; 
    
        if ($username=="" or $password=="" ) 
        { 
            echo "<h1>Username or password is blank</h1>"; 
            clearsessionscookies(); 
            header("location: login.php?returnurl=$returnurl"); 
        } 
        else 
        { 
            if(confirmuser($username,md5($password))) // As pointed out by asgard2005 
            { 
                createsessions($username,$password); 
                if ($returnurl<>"") 
                    header("location: $returnurl"); 
                else 
                { 
                    header("Location: index.php"); 
                } 
            } 
            else 
            { 
                echo "<h1>Invalid Username and/Or password</h1>"; 
                clearsessionscookies(); 
                header("location: login.php?returnurl=$returnurl"); 
            } 
        } 
        break; 
    case "logout": 
        clearsessionscookies(); 
        header("location: index.php"); 
        break; 
    } 
    ?>
    
    functions.php
    Code:
    <?php 
    
    function createsessions($username,$password) 
    { 
        //Add additional member to Session array as per requirement 
        session_register(); 
    
        $_SESSION["gdusername"] = $username; 
        $_SESSION["gdpassword"] = md5($password); 
         
        if(isset($_POST['remme'])) 
        { 
            //Add additional member to cookie array as per requirement 
            setcookie("gdusername", $_SESSION['gdusername'], time()+60*60*24*100, "/"); 
            setcookie("gdpassword", $_SESSION['gdpassword'], time()+60*60*24*100, "/"); 
            return; 
        } 
    } 
    
    function clearsessionscookies() 
    { 
        unset($_SESSION['gdusername']); 
        unset($_SESSION['gdpassword']); 
         
        session_unset();     
        session_destroy();  
    
        setcookie ("gdusername", "",time()-60*60*24*100, "/"); 
        setcookie ("gdpassword", "",time()-60*60*24*100, "/"); 
    } 
    
    function confirmUser($username,$password) 
    { 
        // $md5pass = md5($password); // Not needed any more as pointed by ted_chou12 
    
        /* Validate from the database but as for now just demo username and password */ 
        if($username == "demo" && $password = "demo") 
            return true; 
        else 
            return false; 
    } 
    
    function checkLoggedin() 
    { 
        if(isset($_SESSION['gdusername']) AND isset($_SESSION['gdpassword'])) 
            return true; 
        elseif(isset($_COOKIE['gdusername']) && isset($_COOKIE['gdpassword'])) 
        { 
            if(confirmUser($_COOKIE['gdusername'],$_COOKIE['gdpassword'])) 
            { 
                createsessions($_COOKIE['gdusername'],$_COOKIE['gdpassword']); 
                return true; 
            } 
            else 
            { 
                clearsessionscookies(); 
                return false; 
            } 
        } 
        else 
            return false; 
    } 
    ?> 
    
    index.php
    Code:
    <?php 
    ob_start(); 
    session_start(); 
    
    require_once ("functions.php"); 
    
    if (checkLoggedin()) 
        echo "<H1>You are already logged in - <A href = \"login.php?do=logout\">logout</A></h1>"; 
    else 
        echo "<H1>You are not logged in - <A href = \"login.php\">login</A></h1></h1>"; 
    ?> 
    
    :thinking:
     

    Attached Files:

  18. Ryzer

    Ryzer New Member

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    sorry double post.. could not edit

    could it have something to do with notepad++ as that is my text editor of choice... i will try a different editor now and if anything changes i'll update here
     
  19. Ryzer

    Ryzer New Member

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    problem resolved :happy: curious as to why this happens though. it was the php start tag causing the error...

    Code:
        { 
            ?> 
            <form NAME="login1" ACTION="login.php?do=login" METHOD="POST" ONSUBMIT="return aValidator();"> 
            <input TYPE="hidden" name="returnurl" value="<?$returnurl?>"> 
            <TABLE cellspacing="3"> 
            <TR> 
                <TD>Username:</TD> 
                <TD><input TYPE="TEXT" NAME="username"></TD> 
                <TD>Password:</TD> 
                <TD><input TYPE="PASSWORD" NAME="password"></TD> 
            </TR> 
            <TR> 
                <TD colspan="4" ALIGN="center"><input TYPE="CHECKBOX" NAME="remme">&nbsp;Remember me for the next time I visit</TD> 
            </TR> 
            <TR> 
                <TD ALIGN="CENTER" COLSPAN="4"><input TYPE="SUBMIT" name="submit" value="Login"></TD> 
            </TR> 
            </form> 
            </TABLE> 
        [B]<?[/B] 
        } 
    
    changed to
    Code:
            </TABLE> 
        [B]<?php[/B] 
        } 
    
    anyone have insight as to why the code posted in article works for everyone except myself?
     
  20. shabbir

    shabbir Administrator Staff Member

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    Ohh !!

    Your server setting is such that it needs <?php and does not work with <?

    Are you using IIS because with Apache its not the case.
     

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