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Comments on How To Verify Old Password in PHP?

Post

How To Verify Old Password in PHP? [closed]

+0
−1

Closed as unclear by Alexei‭ on Mar 29, 2022 at 08:40

This question cannot be answered in its current form, because critical information is missing.

This question was closed; new answers can no longer be added. Users with the reopen privilege may vote to reopen this question if it has been improved or closed incorrectly.

  • I have a page to change the user password in my website, this page can only be used if the user have a logged in!

  • The change password page have 3 inputs: Old Password, New Password and Confirm Password each one will verify if it is empty.

  • I tried using the password_verify method but it didn't worked

I wanted to be able to check if the user old password is valid

Here is some relevant code:

<?php
// Inicializar a sessão
session_start();

// Verificar se o utilizador está ligado, se não estiver, redireccioná-lo para a página de início de sessão
if (!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true) {
  header("location: login.php");
  exit;
}

// Incluir ficheiro de configuração
require_once "config.php";

// Definir variáveis e inicializar com valores vazios
$old_password = $old_password_err = "";
$new_password = $confirm_password = "";
$new_password_err = $confirm_password_err = "";

// Processamento de dados do formulário quando o formulário é submetido
if ($_SERVER["REQUEST_METHOD"] == "POST") {

  // Validar Palavra-Passe atual
  if (empty(trim($_POST["old_password"]))) {
    $old_password_err = "Este campo é obrigatório!";
  } else {
    $old_password = trim($_POST["old_password"]);
  }

  //Validar se a Palavra-Passe está correta!
  //code

  // Validar Palavra-Passe
  if (empty(trim($_POST["new_password"]))) {
    $new_password_err = "Este campo é obrigatório!";
  } elseif (strlen(trim($_POST["new_password"])) < 6) {
    $new_password_err = "A Palavra-Passe deve ter pelo menos 6 caracteres.";
  } else {
    $new_password = trim($_POST["new_password"]);
  }

  // Validar confirmação de Palavra-Passe
  if (empty(trim($_POST["confirm_password"]))) {
    $confirm_password_err = "Este campo é obrigatório!";
  } else {
    $confirm_password = trim($_POST["confirm_password"]);
    if (empty($new_password_err) && ($new_password != $confirm_password)) {
      $confirm_password_err = "A Palavra-Passe não correspondeu.";
    }
  }

  // Verificar erros antes de atualizar a base de dados
  if (empty($old_password_err) && empty($new_password_err) && empty($confirm_password_err)) {
    // Preparar uma declaração de inserção
    $sql = "UPDATE users SET password = ? WHERE id = ?";

    if ($stmt = mysqli_prepare($link, $sql)) {
      // Ligar variáveis à declaração preparada como parâmetros
      mysqli_stmt_bind_param($stmt, "si", $param_password, $param_id);

      // Definir parâmetros
      $param_password = password_hash($new_password, PASSWORD_DEFAULT);
      $param_id = $_SESSION["id"];

      // Tentatar executar a declaração preparada
      if (mysqli_stmt_execute($stmt)) {
        // Palavra-Passe atualizada, destruir sessão e redirecionar para página de login
        session_destroy();
        header("location: login.php");
        exit();
      } else {
        echo "Algo de errado não está certo!";
      }

      // Declaração de encerramento
      mysqli_stmt_close($stmt);
    }
  }

  // Ligação fechada
  mysqli_close($link);
}
?>
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1 comment thread

General feedback (1 comment)
General feedback
Canina‭ wrote over 2 years ago

To say that something "didn't work" isn't very specific nor particularly helpful. What exactly did happen? The code you include doesn't seem to call any method named password_verify.

Can you trim this down to a minimal, working (or in your case non-working) example that illustrates the difficulty you are having? Ideally with comments and messages in English.

Surely you already verify the current password during the login process. What prevents you from using the exact same functionality as you use there to verify the current password during the password change process?