Can someone please tell me how i am suppose to verify a hashed password when someone is logging in?
here is my registration code:
$db_password = password_hash($password, PASSWORD_DEFAULT);
// Enter info into the Database.
$info2 = htmlspecialchars($info);
$sql = mysql_query("INSERT INTO users
(first_name, last_name, email_address, username, password, signup_date)
VALUES('$first_name', '$last_name',
'$email_address', '$username',
'$db_password', now())")
or die (mysql_error());
this is my check user code run at login . .
$hash = password_hash($password, PASSWORD_DEFAULT);
// check if the user info validates the db
$sql = mysql_query("SELECT *
FROM users
WHERE username='$username'
AND password='$hash'
AND activated='1'");
$login_check = mysql_num_rows($sql);
i can not figure it out.
Your verification is wrong...you are hashing the password all over again, which will result in a brand-new salt...thus a completely different hash value. When passwords are hashed (correctly), they use a salt (random string) that is sufficiently long to prevent a rainbow attack. password_hash is doing all of this behind the scenes for you.
However, this means you have to make sure to use the same salt in order to verify the password by storing it along with the hash. In the case of the code you are using, it's doing this part for you and the salt is the prefix of the result of password_hash.
When the user logs in, you need to do:
if( password_verify($loginPasswordText, $hashStoredInDb) ) {
//SUCCESS
}
No need to password hashing again at login time, Use simply password_verify() function to verify your stored password & given password at login moment. See more about Password Hashing API here http://php.net/manual/en/ref.password.php
For now Try like this,
<?php
// this is the example hashed password that you have to select from Database.
$hash = '$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';
if (password_verify('password_given_at_login', $hash)) {
echo 'Password is valid!';
} else {
echo 'Invalid password.';
}
?>
Related
I created registration form with hashed password and now I am not really sure how to fetch the hashed password and be able to login.
Registration.php
$hash = password_hash($password, PASSWORD_BCRYPT);
$insert = $con->query("INSERT INTO Client (firstName, lastName, email, password, keyVerification) VALUES
('$firstName', '$lastName', '$email', '$hash', '$keyVerification')");
Login.php
$email = $con->real_escape_string($_POST['email']);
$password = $con->real_escape_string($_POST['password']);
$hash = password_hash($password, PASSWORD_BCRYPT);
$result = $con->query("SELECT * FROM Client WHERE email = '$email' AND password = '$hash' LIMIT 1");
Unfortunately this way doesn't work when I want to login with registered email and password - I am just getting error I set up of incorrect password or email. I believe I am making the mistake with hashed password. Where my logic failed ?
You get a new seed whenever you call password_hash so you can't compare the output of it with the previous output, even when the input is the same.
Search the database to find the hashed password for the email address given.
Then compare the submitted password to the known hash using password_verify.
if (password_verify($_POST['password'], $hash_from_database)) {
Asides:
$password = $con->real_escape_string($_POST['password']);
$hash = password_hash($password, PASSWORD_BCRYPT);
Don't escape the password to make it suitable for inserting into SQL and then hash the escaped password.
Escape what you want to put into the database, which is the hashed password.
… but don't use real_escape_string in the first place. Use placeholders.
You should try with the password_verify ( string $password , string $hash ) : bool function, as the hash function will generate new hashes for the same password string each time.
Read more here: https://www.php.net/manual/en/function.password-verify.php
Code Here is encrypting password but How I decrypt it or Compare it to login in laravel
Code where used
getsql(md5($_POST['regpassword'] . SALT), "default"),
md5 is hashing and it's not reversible you can't decrypt it you can only hash the password using the same algorithm and salt then compare the results to make sure that it's the correct password
When you're validating the password, you can do:
$hashed = md5($_POST['password'] . SALT);
$sql = "SELECT * FROM users WHERE username = '{$_POST['username']}' AND password = '$hashed'";
I've simplified this to show the important part of how to check the password, in reality you should use a prepared statement to prevent SQL injection.
Another way is to fetch the hashed password from the database, then compare it with the hashed+salted password that was given:
$hashed = md5($_POST['password'] . SALT);
$sql = "SELECT password FROM users WHERE username = '{$_POST['username']}'";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);
if ($row && $hashed == $row['password']) {
// user is validated
}
If you fix your method of storing passwords to use a more reasonable method than a static SALT, this second method can easily be updated. Instead of $hashed == $row['password'] you would use password_verify($_POST['password'], $row['password']).
I am making a registration and login form, which asks for the user's email and password. In my registration file I hashed the password provided by the user, and stored it in the database, with the function password_hash. In my login form I tried to verify the password provided by the user with the stored hashed password in the database, but it fails. I used the password_verify function. Here is a snippet of the registration code:
Registration file snippet
if(!isset($error)){
//hash the password
$hashedpassword = password_hash($_POST['password'], PASSWORD_DEFAULT);
echo $hashedpassword;
try {
$sql = "INSERT INTO users (mail, password, province) VALUES (:mail, :password, :province)";
$stmt = $db->prepare($sql);
//Bind variables
$stmt->bindValue(':mail', $mail);
$stmt->bindValue(':password', $hashedpassword);
$stmt->bindValue(':province', $province);
//Execute the statement and insert the new account.
$result = $stmt->execute();
//If the signup process is successful.
if($result){
echo $hashedpassword;
exit;
}
}
catch(PDOException $e) {
$error[] = $e->getMessage();
}
}
Hashed passwords in database
For these passwords I get the following hashed passwords, which are stored in the database:
football:
$2y$10$q0Y8Mfdl75Dt8op7WaqQM.t5y4LMO6gfYwmbycL1xRMiUUQu8dtWm$2y$10$q0Y8Mfdl75Dt8op7WaqQM.t5y4LMO6gfYwmbycL1xRMiUUQu8dtWm
cricket:
$2y$10$Pyoz1XC0skRjHLjxHdrYYeYplY98w4uOp23QpZb/VNN0y41/6YPJC$2y$10$Pyoz1XC0skRjHLjxHdrYYeYplY98w4uOp23QpZb/VNN0y41/6YPJC
The type for the password row is varchar(255) and the collation is utf8mb4_general_ci The passwords are stored like this:
$2y$10$q0Y8Mfdl75Dt8op7WaqQM.t5y4LMO6gfYwmbycL1xRM...
$2y$10$Pyoz1XC0skRjHLjxHdrYYeYplY98w4uOp23QpZb/VNN...
When I hover over the passwords it says 'Original length 60'.
Login file snippet
This is a snippet of my login file code:
$mail = htmlspecialchars_decode($_POST['mail'], ENT_QUOTES);
if(!filter_var($mail, FILTER_VALIDATE_EMAIL) and !empty($_POST['mail'])) {
$error[] = 'Please enter a valid email address';
}
$stmt = $db->prepare('SELECT mail, password FROM users WHERE mail = :mail');
$stmt->execute(array(':mail' => $mail));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
if(!empty($row['mail'])){
$error[] = 'Email provided is good.';
}
$password = $_POST['password'];
$stmt = $db->prepare('SELECT password FROM users WHERE password = :password');
$stmt->execute(array(':password' => $password));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$checkpass = $row['password'];
echo $checkpass;
if(password_verify($password, $row['password'])) {
$error[] = 'Password provided is good.';
}
Checking whether the email can be found in the database works fine, as it gives me the error message (which I need to change to a normal message).
But I can't get the password verification working. I tried to see what the code pulls out the database with $checkpass = $row['password']; and
echo $checkpass;
But it doesn't return anything (maybe because it only returns a 0 or 1 value?).
Maybe it has to do something with the way I try to select the hashed password out of the database? Or the way I insert them in the database, or the MySQL table options? It may be a simple fix but I tried many different things and I couldn't get it to work.. Hope you guys can help!
The second query seems to be useless since in the first query you already select the mail and password fields. So you should just need to execute the first query, check if the user is valid and then check the password with the password_verify method.
Your second query fails (probably) because in the condition you pass the cleartext but in the DB there is the hashed password so you will never find anything. To check print the second query before the execution.
Before executing query for password check in login you should create hashed password for the input password and that hashed password need to be compared
Basically, I've just started working with PHP, and am trying to get to grips with the password_hash function. When a user registers I hash their password using:
$hashed_password = password_hash($p, PASSWORD_DEFAULT);
Then, that hashed password is stored in my database. I then want to retrieve the password for login. So my code is written so that once the form is submitted, the email and password strings are sanitized, it the checks that they're not blank, once that's done, I take the user entered password, and hash it using:
$hash = password_hash($password, PASSWORD_DEFAULT);
Once again. Once this has done I connect to my DB, and try to select the user using:
$q = "SELECT * FROM users
WHERE email='$email' AND password='$hash'";
However. When debugging I've noticed that the user entered string, despite being the same as the string entered when signing up is different when hashed. so I've been echo'ing $hash and getting:
$2y$10$LQ55Q1DUqIgRx/2hgnbrnuQrYvrrBrq4WEFmV8TuxII6rDocaWzt2
but the exact same string "password" is stored in the db as:
$2y$10$omNPA7cviUm.6asuhJIJ8Or.m9WeHhJMkCqYYijel5g.NflbdVnV.
How do I get it so that when the user enters their password, it hashes the string and matches the one in the DB, so that they can log in? Am I missing something
Cheers
You'd need something like this:
$hashed_password = mysql_result(mysql_query("SELECT password FROM users WHERE email='$email'"));
$match = password_verify( $password, $hashed_password );
if($match){
echo 'Password is valid';
} else {
echo 'Password is not valid' ;
}
On my registration page I have used an SHA1 has and a salt to store my passwords in the database. I think I have done this correctly as when I check the database it is has with the salt included. This is how I have done it.
$newPassword = $_POST['Password'] ;
if (!empty($newPassword)) {
//Escape bad characters
//$newuser = mysql_real_escape_string($newuser);
//remove leading and trailing whitespace
$newPassword = trim($newPassword);
$newPassword = sha1($newPassword);
$salt = '-45dfeHK/__yu349#-/klF21-1_\/4JkUP/4';
}
else die ("ERROR: Enter a Password");
and input is
$query = "INSERT INTO members (memberFirstname, memberSecondname, memberEmailaddress, memberPassword, memberAddress, memberPostcode) VALUES ('$newFirstName', '$newSecondName', '$newEmailAddress', '$newPassword$salt', '$newAddress', '$newPostcode')";
My problem lays when I try to login. Im unsure on how remove the salt and unhash the password (if that is what needs to be done). I can enter the email address and paste the hash and salt into the password field and can successfully login.
This is my script to log in.
<?php
include 'db.inc';
session_start();
$UserEmail =$_POST["EmailAddress"];
$UserPassword =$_POST["Password"];
$query = "SELECT * FROM members WHERE memberEmailaddress = '$UserEmail'
AND memberPassword = '$UserPassword' ";
$connection = mysql_connect($hostname, $username, $password) or die ("Unable to connect!");
mysql_select_db($databaseName) or die ("Unable to select database!");
$result = mysql_query($query) or die ("Error in query: $query. ".mysql_error());
// see if any rows were returned
if (mysql_num_rows($result) > 0) {
$_SESSION["authenticatedUser"] = $UserEmail;
// Relocate to the logged-in page
header("Location: Index.php");
}
else
{
$_SESSION["message"] = "Could not connect log in as $UserEmail " ;
header("Location: Login.php");
}
mysql_free_result($result);
mysql_close($connection);
?>
There are several problems with your approach. First you don't use the salt at all, it will be stored but not used. Second a salt should be unique for each password, in your case a static salt is used, this is actually a pepper not a salt. Further you use a fast hash algorithm, but this can be brute-forced ways too fast, instead you should switch to a hash algorithm with a cost factor like BCrypt or PBKDF2.
PHP already has a good function to hash passwords (maybe you need the compatibility pack):
// Hash a new password for storing in the database.
// The function automatically generates a cryptographically safe salt.
$hashToStoreInDb = password_hash($password, PASSWORD_BCRYPT);
// Check if the hash of the entered login password, matches the stored hash.
// The salt and the cost factor will be extracted from $existingHashFromDb.
$isPasswordCorrect = password_verify($password, $existingHashFromDb);
Because this function generates a safe salt on its own and attaches it to the resulting hash-value, you cannot check the password with SQL directly. Instead you do a query to get the stored hash (by username), then you can verify the entered password with the stored one. I wrote a tutorial where i tried to explain the important points more indepth.