Login system password and username
Question
I wrote php code for my signin.php file and my query works for my username but when i put in the password variable , it doesn't do anything. I want the user to put in a username and password because all they have to put in to get to the restricted page , is a username no password. It checks if the username is in the database table, if it is, it goes to the restricted page. I posted a question like this and i got good answers but i don't know where to put the information , This is my process.php :
<?php
include("db.php");
$username = $_POST['username'];
$pw = $_POST['StorePassword'];
if ( isset( $_POST['login'] ) ) {
$query = mysqli_query($conn, "SELECT * FROM users WHERE username='".$username."' StorePassword='".$pw."' ");
$StorePassword = password_hash($pw, PASSWORD_BCRYPT, array('cost' => 8));
if ( mysqli_num_rows($query) > 0 ) {
while ( $row = mysqli_fetch_assoc( $query ) ) {
if ( $row['StorePassword'] == $pw ) {
header("Location: home.php");
} else {
echo "Wrong password";
}
}
} else {
echo "User not found <br />";
}
if(empty($pw)){
echo"Please enter your password.";
} else{
}
}
?>
<html>
<body>
<a href="signin.php">Please try again</a>
</body>
</html>
1 answers
solution1
3
Firstly you should use prepared statements for security.
Step 1: You want to check that the username and password have been entered:
if ( !isset($_POST['username'], $_POST['password']) ) {
// Could not get the data that should have been sent.
die ('You must enter a username and password!');
}
Step 2: Check the username against your database:
if ($stmt = $conn->prepare('SELECT password FROM users WHERE username = ?')) {
// Bind parameters (s = string, i = int, b = blob, etc), hash the password using the PHP password_hash function.
$username = $_POST['username'];
$stmt->bind_param('s', $username);
if(!$stmt->execute()){
trigger_error("there was an error....".$mysqli->error, E_USER_WARNING);
}
$stmt->store_result();
Step 3: Check the password matches ( Php manual for password_verify ) :
if ($stmt->num_rows > 0) {
$stmt->bind_result($password);
$stmt->fetch();
// Account exists, now we verify the password.
if (password_verify($_POST['password'], $password)) {
// Verification success! User has loggedin!
header("Location: home.php");
} else {
echo 'Incorrect username and/or password!';
}
} else {
echo 'User doesnt exist';
}
$stmt->close();
All together:
<?php
session_start();
include("db.php");
if ( !isset($_POST['username'], $_POST['password']) ) {
// Could not get the data that should have been sent.
die ('Username and/or password not set');
}
// Prepare our SQL
if ($stmt = $mysqli->prepare('SELECT password FROM users WHERE username = ?')) {
// Bind parameters (s = string, i = int, b = blob, etc), hash the password using the PHP password_hash function.
$username = $_POST['username'];
$username = strtolower($username);
$stmt->bind_param('s', $username);
if(!$stmt->execute()){
trigger_error("there was an error....".$mysqli->error, E_USER_WARNING);
}
$stmt->store_result();
// Store the result so we can check if the account exists in the database.
if ($stmt->num_rows > 0) {
$stmt->bind_result($password);
$stmt->fetch();
// Account exists, now we verify the password.
if (password_verify($_POST['password'], $password)) {
// Verification success! User has loggedin!
header("Location: home.php");
} else {
echo 'Incorrect username and/or password!';
}
} else {
echo 'Incorrect username blar password!';
}
$stmt->close();
} else {
echo 'Could not prepare statement!';
}
?>
Check out the php guide on prepared statements http://php.net/manual/en/mysqli.quickstart.prepared-statements.php
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