Code for a simple singin page using php - php

I am new to programming. I need a simple login page code for PHP which displays an error message in the same page for incorrect login details and redirected to the account page incase of correct login details. The code should remember the activity and redirect to the account page of the user if he has closed the page without login out. Any help would be deeply appreciated.
Log in page
<html>
<head>
<title>Login</title>
</head>
<h3>Login Page</h3>
<form action="trylog.php" method = "post"><!--action redirects to trylog.php -->
<label for="username">Username</label> <input type="username" id="usename" name="username"><br /><br /><!--username label defined -->
<label for="password">Password:</label> <input type="password" id="password" name="password"><br /><br /><!--password label defined -->
<button type = "submit">Login</button><!--submit button defined -->
</form>
</html>
Account page
<html>
<title>Login</title>
<body>
<?php
session_start(); //resumes previous session based on indentifiers from POST attribute in login.php
$usr = "admin"; //usr keyword defined
$psw = "password"; //psw keyword defined
$username = '$_POST[username]';
$password = '$_POST[password]';
//$usr == $username && $psw == $password
if ($_SESSION['login']==true || ($_POST['username']=="admin" && $_POST['password']=="password"))
//checking for correctness of username and password
{
echo "password accepted";
$_SESSION['login']=true;
//successful login confirmation
echo "<br><a href='http://localhost/login/login.php'>Logout</a>";
}
else
{
echo "incorrect login";
//incorrect login message
}
session_destroy(); //destroys session
?>
</body>
</html>
Thanks
Navaneeth

session_start has to be before output, so move that before <html> etc. (output is a space before <?php too. <?php has to be the first sequence in your code.
what you meant by $psw and $usr variables? You have them in form, delete them.
When you work with variables, don´t use quotes - you can use double-quotes marks, not single. Better is to use no quote marks: $username = $_POST['username'];. On the other hand, the key should be in quote marks, elsewhere you work with undefined constant username - if constant doesn´t exists, PHP work with the same string.
Condition on line 12 will never be true because you test there a SESSION which hasn´t been set before. You set this session on your line 16, but only if this session already exists (line 12). It´s logical nonsense :-)
Why you create variables $username and $password when you doesn´t work with them?
Before you work with $_POST, lines 9 and 10, you must check if the form was sent, so if (isset($_POST['username'])) {}.

Related

Login Screen - Not working

I've got a login screen all setup but my php code doesn't seem to work with it. Can't find the issue either as the details I'm entering are correct but it is not displaying either of the outputs. 1 - being proceed to next page. 2 - being display message saying incorrect details. Atleast thats what I think it should be doing. My code is here;
<?php
session_start();
if (isset($_POST['login'])):
require_once('my_connect.php');
$username=$_POST['username'];
$password=$_POST['password'];
$my_query="SELECT * from loanusers where username='$username' AND password='$password'";
$result= mysqli_query($connection, $my_query);
if (mysqli_num_rows($result) >0):
while ($myrow = mysqli_fetch_array($result)):
$_SESSION['userid'] = $myrow["userid"];
$_SESSION['username'] = $myrow["username"];
$_SESSION['password'] = $password;
$_SESSION['usertype'] = $myrow["usertype"];
$_SESSION['authenticated'] = true;
echo "<b> Hi ".$_SESSION['username']." (ID: ".$_SESSION['userid']."), You are now logged in!</b>";
endwhile;
//header('Location: homepage.php');
else:
echo "<b>Username or Password incorrect</b>";
endif;
mysqli_close();
endif;
require_once 'loginheader.php';
?>
<html>
<body>
<h2>User Login</h2>
<div id="loginp"><p>Need an Account? <a href='adduser.php'><b>Sign Up</b> </p></a></div>
<table>
<form method="POST" action="homepage.php" autocomplete="off">
<input type="text" name="username" placeholder="Username...">
<br><br>
<input type="password" name="password" placeholder="Password...">
<br><br>
<input type="submit" name="loanlogin" value="Sign In" onclick="window.location.href='homepage.php'">
</form>
</table>
<br>
<div id="loginp"><p>Forgot your Password?<b> Click Here</b></p></a></div>
<body>
<html>
Check these two Ideas:
What are the values of $usernameand $password before you issue them to the select statement. (i would guess they are empty, then remove the onclick)
is their really a username with this password in the database.
i would guess it's the onclick in your submit. You don't need this event their and it is not submitting the Form element.
Note that your code looks vulnerable to SQL and XSS injections, it's important to learn about security too while learning in PHP :-)
The html post action was taking me to another page bypassing the login script.
I changed the action to index.php and the login now displays an error if the details are incorrect and takes me to the take page if details are correct.
Thanks All for helping
Remove the onclick Like user nv1t said as, there is already an form action referring to the same page. onclick functions are only for <button> tags
To pull the value, check this how to get a selected database value as a session variable in php - stackoverflow
Click the tick near the answer if this helped.

PHP Session not setting unless I refresh

I've created a working session (with help from here I might add) and I've managed to get it to store a variable across multiple files without any problems.
When $username isn't filled, there's a prompt for the user to submit their username and upon submitting $username is assigned the value of the user's name and the form is replaced with text, no longer prompting the user to enter a username, in theory.
Here's the code I have right now:
<?php
session_start();
?>
<header>
<!DOCTYPE html>
<link rel="stylesheet" type="text/css" href="style/main.css">
<title>webshop</title>
</header>
<div id="LogIn">
<?php
if(isset($_SESSION['username'])){
echo 'Current session username: '.$_SESSION['username'];
echo '<br />Destroy current session';
} else {
?>
<form class="form1" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" id="form1">
<fieldset>
<ul>
<p>Please enter your username to continue to the webshop.</p>
<label for="name">User Name:</label><span><input type="text" name="username" placeholder="User Name"
class="required" role="input"
aria-required="true"/></span>
<input class="submit transparentButton" value="Next" type="submit" name="Submit"/>
</ul>
<br/>
</fieldset>
</form>
<?php
if (isset($_POST['Submit'])) {
$_SESSION['username'] = $_POST['username'];
}
}
?>
</div>
cart<br />
index
The problem I'm having is that once the user has entered their username into the form and clicks "next", the page reloads and the form is still there. If you then refresh that page, it replaces the form with the text and the session variable $username parsed as plain text with a link to logout (session_destroy()).
My question is why do I have to refresh the page for the session variable to be displayed properly? Is it something to do with the if statement?
Thanks in advance.
You simply have a logic / ordering problem.
Move this piece of code that is currently below your form:
if (isset($_POST['Submit'])) {
$_SESSION['username'] = $_POST['username'];
}
to the top of your file, just below the session_start(), and it will behave as you intend.
The way your code is written now, the session variable is not set until AFTER the form displays. You want the session variable to be set BEFORE the form displays (if in fact the $_POST username is set).

Prevent opening page without login

I have created a webpage (lets call the root as main.php) and decided to put a login on top of it (file index.php). The login works fine, but the problem is this. If I type the address of the page (main.php) directly in the browser, it is opened.
Is there any way to prevent opening the page unless I go through the login?
In case it is relevant, this is the login code:
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="/css/style.css">
</head>
<body>
<div class="login_container">
<div id="login-form">
<h3>Login</h3>
<fieldset>
<form action="checklogin.php" method="post">
<input name="username" type="text" required placeholder="Username">
<input name="password" type="password" required placeholder="*******">
<input type="submit" value="Login">
</form>
</fieldset>
</div>
</div>
</body>
</html>
and it directs to :
<?php
ob_start();
// Define $username and $password
$username=$_POST['username'];
$password=$_POST['password'];
$username = stripslashes($username);
$password = stripslashes($password);
$username = pg_escape_string($username);
$password = pg_escape_string($password);
if($username == "username" && $password == "password"){
$_SESSION['username']="username";
$_SESSION['password']="password";
header("location:main.php");
}
else header("location:index.php");
ob_end_flush();
?>
You need to check, on every request that requires a login, that the user is logged in and is authorized.
A good way of looking at this is seeing the request URL as part of the input to your program. Just like the cookies and GET/POST parameters are input.
main.php will either return a page with data or a request for login.
Sure.
Check if the user is currently logged on when they access the page using php sessions if they aren't logged on send an error, or redirect them elsewhere.

How to stop else showing as default on basic PHP login script

I am using PHP to build a very basic login script. However, the else from the ifelse statement shows by default before the user has even clicked log in.
Before the user has even tried to login they are greeted with this:
Warning: Cannot modify header information - headers already sent by (output started at /home/madhous3/public_html/dev/admin/index.php:12) in /home/madhous3/public_html/dev/admin/login.php on line 13
Sorry, please try again.
How do I stop this? However, if the user enters the details correctly, they are directed to the right page.
Code
index.php
<?php
include("login.php");
?>
<h1>Admin Area Login</h1>
<form method="post" action="login.php">
Username<input type="text" name="username" />
Password<input type="text" name="password" />
<input type="submit" name="log_in" value="Log In" />
</form>
login.php
<?php
$username_inputted = $_POST['username'];
$password_inputted = $_POST['password'];
if($username_inputted == 'admin' && $password_inputted == 'password'){
header("location:login_success.php");
}else{
header("location:index.php");
echo "Sorry, please try again.";
}
?>
Try removing the include("login.php") from index.php.
Instead, you should redirect back to index.php from your login.php with a flag specifying that the user entered the wrong information (if they failed the login).
index.php
<?php
if(isset($_REQUEST['fail'])) {
echo 'Login failed.';
}
?>
<h1>Admin Area Login</h1>
<form method="post" action="login.php">
Username<input type="text" name="username" />
Password<input type="text" name="password" />
<input type="submit" name="log_in" value="Log In" />
</form>
login.php
<?php
$username_inputted = $_POST['username'];
$password_inputted = $_POST['password'];
if($username_inputted == 'admin' && $password_inputted == 'password'){
header("location:login_success.php");
} else {
header("location:index.php?fail=1");
}
?>
OK, so what's happening is that in index.php you're including login.php at the start. At that time it imports everything from login.php. Since you're including it, the script is going to run.
At the load of the page index.php, the script on login.php starts. It defines those variables $username_inputted & $password_inputted as null, since the POST hasn't happened yet. Then the if block checks, finds null variables, then the else block fires since the variables aren't equal to the expected login info because they're null.
Therefore the echo fires and is displayed on the screen before anything is POSTed.
Nav_nav's solution should work well, since the only time the 'bad login' echo will be displayed is if someone entered something into the input fields, I just wanted to give you a rundown of the algorithm's reason for messing up.
try this
if (!empty($_POST['username']) && !empty($_POST['password'])) {
//define input vars
$username_inputted = $_POST['username'];
$password_inputted = $_POST['password'];
if($username_inputted == 'admin' && $password_inputted == 'password'){
header("location:login_success.php");
}else{
header("location:index.php");
echo "Sorry, please try again.";
}
}
First get rid of the header('location:login.php'). You can't send a header if you've already started sending any HTML to the browser. And if it did work, you'd get an endless loop of reloads.
Then:
You could check for $_POST ['submit'] and if it doesnt exist then don't show them the try again message.

Easy way to password-protect php page

I have a page I want to password-protect. I've tried doing HTTP authentication, but for some reason it doesn't work on my hosting. Any other quick (and easy) way to do this? Thanks!
Not exactly the most robust password protection here, so please don't use this to protect credit card numbers or something very important.
Simply drop all of the following code into a file called (secure.php), change the user and pass from "admin" to whatever you want. Then right under those lines where it says include("secure.html"), simply replace that with the filename you want them to be able to see.
They will access this page at [YouDomain.com/secure.php] and then the PHP script will internally include the file you want password protected so they won't know the name of that file, and can't later just access it directly bypassing the password prompt.
If you would like to add a further level of protection, I would recommend you take your (secure.html) file outside of your site's root folder [/public_html], and place it on the same level as that directory, so that it is not inside the directory. Then in the PHP script where you are including the file simply use ("../secure.html"). That (../) means go back a directory to find the file. Doing it this way, the only way someone can access the content that's on the (secure.html) page is through the (secure.php) script.
<?php
$user = $_POST['user'];
$pass = $_POST['pass'];
if($user == "admin"
&& $pass == "admin")
{
include("secure.html");
}
else
{
if(isset($_POST))
{?>
<form method="POST" action="secure.php">
User <input type="text" name="user"></input><br/>
Pass <input type="password" name="pass"></input><br/>
<input type="submit" name="submit" value="Go"></input>
</form>
<?}
}
?>
This is a bit late but I wanted to reply in case anyone else came upon this page and found that the highest reply was a bit off. I have improved upon the system just a tad bit. Note, it is still not amazingly secure but it is an improvement.
First prepare your password salts file:
hash_generate.php:
<?php
$user = "Username"; // please replace with your user
$pass = "Password"; // please replace with your passwd
// two ; was missing
$useroptions = ['cost' => 8,];
$userhash = password_hash($user, PASSWORD_BCRYPT, $useroptions);
$pwoptions = ['cost' => 8,];
$passhash = password_hash($pass, PASSWORD_BCRYPT, $pwoptions);
echo $userhash;
echo "<br />";
echo $passhash;
?>
Take your output $userhash and $passhash and put them in two text files: user.txt and pass.txt, respectively. Others have suggested putting these text files away above public_html, this is a good idea but I just used .htaccess and stored them in a folder called "stuff"
.htaccess
deny from all
Now no one can peek into the hash. Next up is your index.php:
index.php:
<?php
$user = ""; //prevent the "no index" error from $_POST
$pass = "";
if (isset($_POST['user'])) { // check for them and set them so
$user = $_POST['user'];
}
if (isset($_POST['pass'])) { // so that they don't return errors
$pass = $_POST['pass'];
}
$useroptions = ['cost' => 8,]; // all up to you
$pwoptions = ['cost' => 8,]; // all up to you
$userhash = password_hash($user, PASSWORD_BCRYPT, $useroptions); // hash entered user
$passhash = password_hash($pass, PASSWORD_BCRYPT, $pwoptions); // hash entered pw
$hasheduser = file_get_contents("stuff/user.txt"); // this is our stored user
$hashedpass = file_get_contents("stuff/pass.txt"); // and our stored password
if ((password_verify($user, $hasheduser)) && (password_verify($pass,$hashedpass))) {
// the password verify is how we actually login here
// the $userhash and $passhash are the hashed user-entered credentials
// password verify now compares our stored user and pw with entered user and pw
include "pass-protected.php";
} else {
// if it was invalid it'll just display the form, if there was never a $_POST
// then it'll also display the form. that's why I set $user to "" instead of a $_POST
// this is the right place for comments, not inside html
?>
<form method="POST" action="index.php">
User <input type="text" name="user"></input><br/>
Pass <input type="password" name="pass"></input><br/>
<input type="submit" name="submit" value="Go"></input>
</form>
<?php
}
<?php
$username = "the_username_here";
$password = "the_password_here";
$nonsense = "supercalifragilisticexpialidocious";
if (isset($_COOKIE['PrivatePageLogin'])) {
if ($_COOKIE['PrivatePageLogin'] == md5($password.$nonsense)) {
?>
<!-- LOGGED IN CONTENT HERE -->
<?php
exit;
} else {
echo "Bad Cookie.";
exit;
}
}
if (isset($_GET['p']) && $_GET['p'] == "login") {
if ($_POST['user'] != $username) {
echo "Sorry, that username does not match.";
exit;
} else if ($_POST['keypass'] != $password) {
echo "Sorry, that password does not match.";
exit;
} else if ($_POST['user'] == $username && $_POST['keypass'] == $password) {
setcookie('PrivatePageLogin', md5($_POST['keypass'].$nonsense));
header("Location: $_SERVER[PHP_SELF]");
} else {
echo "Sorry, you could not be logged in at this time.";
}
}
?>
And the login form on the page...
(On the same page, right below the above^ posted code)
<form action="<?php echo $_SERVER['PHP_SELF']; ?>?p=login" method="post">
<label><input type="text" name="user" id="user" /> Name</label><br />
<label><input type="password" name="keypass" id="keypass" /> Password</label><br />
<input type="submit" id="submit" value="Login" />
</form>
Here's a very simple way. Create two files:
protect-this.php
<?php
/* Your password */
$password = 'MYPASS';
if (empty($_COOKIE['password']) || $_COOKIE['password'] !== $password) {
// Password not set or incorrect. Send to login.php.
header('Location: login.php');
exit;
}
?>
login.php:
<?php
/* Your password */
$password = 'MYPASS';
/* Redirects here after login */
$redirect_after_login = 'index.php';
/* Will not ask password again for */
$remember_password = strtotime('+30 days'); // 30 days
if (isset($_POST['password']) && $_POST['password'] == $password) {
setcookie("password", $password, $remember_password);
header('Location: ' . $redirect_after_login);
exit;
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Password protected</title>
</head>
<body>
<div style="text-align:center;margin-top:50px;">
You must enter the password to view this content.
<form method="POST">
<input type="text" name="password">
</form>
</div>
</body>
</html>
Then require protect-this.php on the TOP of the files you want to protect:
// Password protect this content
require_once('protect-this.php');
Example result:
After filling the correct password, user is taken to index.php. The password is stored for 30 days.
PS: It's not focused to be secure, but to be pratical. A hacker can brute-force this. Use it to keep normal users away. Don't use it to protect sensitive information.
Some easy ways:
Use Apache's digest authorization.
Use lighttpd's digest authorization.
Use php's header digest authorization.
If you want you can also make it so only certain ip addresses can login.. :) really easy with lighttpd
Update: I will post some examples soon, so don't vote down for no examples, i just need to get some down for this answer.
If you want to use sessions the following is the best way to go:
# admin.php
session_start();
if(!$_SESSION["AUTH"])
require_once "login.php";
# Do stuff, we are logged in..
# login.php
session_start();
if($_REQUEST["username"] == "user" && $_REQUEST["password"] == "pass")
$_SESSION["AUTH"] = true;
else $_SESSION["AUTH"] = false; # This logs you out if you visit this login script page without login details.
if($_SESSION["AUTH"])
require_once "admin.php";
This method does not contain the examples for above but you seamed interested in this method. The other method examples are still to come, I have not got enough time to get it for apache or lighttpd settings and the php header auth: http://php.net/manual/en/features.http-auth.php Will do.
I would simply look for a $_GET variable and redirect the user if it's not correct.
<?php
$pass = $_GET['pass'];
if($pass != 'my-secret-password') {
header('Location: http://www.staggeringbeauty.com/');
}
?>
Now, if this page is located at say: http://example.com/secrets/files.php
You can now access it with: http://example.com/secrets/files.php?pass=my-secret-password Keep in mind that this isn't the most efficient or secure way, but nonetheless it is a easy and fast way. (Also, I know my answer is outdated but someone else looking at this question may find it valuable)
A simple way to protect a file with no requirement for a separate login page - just add this to the top of the page:
Change secretuser and secretpassword to your user/password.
$user = $_POST['user'];
$pass = $_POST['pass'];
if(!($user == "secretuser" && $pass == "secretpassword"))
{
echo '<html><body><form method="POST" action="'.$_SERVER['REQUEST_URI'].'">
Username: <input type="text" name="user"></input><br/>
Password: <input type="password" name="pass"></input><br/>
<input type="submit" name="submit" value="Login"></input>
</form></body></html>';
exit();
}
This helped me a lot and save me much time, its easy to use, and work well, i've even take the risque of change it and it still works.
Fairly good if you dont want to lost to much time on doing it :)
http://www.zubrag.com/scripts/password-protect.php
</html>
<head>
<title>Nick Benvenuti</title>
<link rel="icon" href="img/xicon.jpg" type="image/x-icon/">
<link rel="stylesheet" href="CSS/main.css">
<link rel="stylesheet" href="CSS/normalize.css">
<script src="JS/jquery-1.12.0.min.js" type="text/javascript"></script>
</head>
<body>
<div id="phplogger">
<script type="text/javascript">
function tester() {
window.location.href="admin.php";
}
function phpshower() {
document.getElementById("phplogger").classList.toggle('shower');
document.getElementById("phplogger").classList.remove('hider');
}
function phphider() {
document.getElementById("phplogger").classList.toggle('hider');
document.getElementById("phplogger").classList.remove('shower');
}
</script>
<?php
//if "login" variable is filled out, send email
if (isset($_REQUEST['login'])) {
//Login info
$passbox = $_REQUEST['login'];
$password = 'blahblahyoudontneedtoknowmypassword';
//Login
if($passbox == $password) {
//Login response
echo "<script text/javascript> phphider(); </script>";
}
}
?>
<div align="center" margin-top="50px">
<h1>Administrative Access Only</h1>
<h2>Log In:</h2>
<form method="post">
Password: <input name="login" type="text" /><br />
<input type="submit" value="Login" id="submit-button" />
</form>
</div>
</div>
<div align="center">
<p>Welcome to the developers and admins page!</p>
</div>
</body>
</html>
Basically what I did here is make a page all in one php file where when you enter the password if its right it will hide the password screen and bring the stuff that protected forward. and then heres the css which is a crucial part because it makes the classes that hide and show the different parts of the page.
/*PHP CONTENT STARTS HERE*/
.hider {
visibility:hidden;
display:none;
}
.shower {
visibility:visible;
}
#phplogger {
background-color:#333;
color:blue;
position:absolute;
height:100%;
width:100%;
margin:0;
top:0;
bottom:0;
}
/*PHP CONTENT ENDS HERE*/
This stores the password in history after login!
You can specify a password in your php code so only users that have the secret url can access:
mywebsite.com/private.php?pass=secret
in your login-protected file:
<?php
if(isset($_GET["pass"]) && $_GET["pass"]=="secret"){
//put your code here
}
else{
echo "you're not allowed to access this page";
}
?>

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