code-boxx/0-PHP-MYSQL-INJECTION.MD

## 0-PHP-MYSQL-INJECTION.MD

      
    Raw
  

              0-PHP-MYSQL-INJECTION.MD
            
          
    SQL INJECTION & PREVENTION IN PHP MYSQL

https://code-boxx.com/php-mysql-injection-prevention/
NOTES


Create a test database and import 1-products.sql.
Change the database settings in 2-db.php to your own.
Access 3a-bad.php in the browser and do an injection search " OR 1=1 OR name LIKE " - This will show all entries.
Access 3b-good.php, the same " OR 1=1 OR name LIKE " search will no longer work.

LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1-products.sql
-- (A) PRODUCTS TABLE
CREATE TABLE `products` (
  `id` bigint(20) NOT NULL,
  `name` varchar(255) NOT NULL,
  `status` tinyint(4) NOT NULL DEFAULT 1
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `products`
  ADD PRIMARY KEY (`id`),
  ADD KEY `status` (`status`);

ALTER TABLE `products`
  MODIFY `id` bigint(20) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;

-- (B) DUMMY DATA
INSERT INTO `products` (`id`, `name`, `status`) VALUES
(1, 'Apple', 1),
(2, 'Beet', 1),
(3, 'Carrot', 0),
(4, 'Dill', 1),
(5, 'Eggplant', 1),
(6, 'Feijoa', 0),
(7, 'Grape', 0),
(8, 'Hazelnut', 1),
(9, 'Icaco', 1),
(10, 'Jalapeno', 1);

## 2-db.php
<?php
// (A) DATABASE SETTINGS - CHANGE TO YOUR OWN!
define("DB_HOST", "localhost");
define("DB_NAME", "test");
define("DB_CHARSET", "utf8mb4");
define("DB_USER", "root");
define("DB_PASSWORD", "");

// (B) CONNECT TO DATABASE
$pdo = new PDO(
  "mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
  DB_USER, DB_PASSWORD, [
  PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
  PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
]);

// (C) RUN SQL SEARCH
$stmt = $pdo->prepare($sql);
$stmt->execute($data);
$results = $stmt->fetchAll();
$stmt = null;
$pdo = null;

// (D) OUTPUT HTML RESULTS
echo "<code class='sql'>$sql</code>";
if (count($results)==0) { echo "<div class='row'>No results</div>"; }
else { foreach($results as $r) {
  printf("<div class='row'>%u %s</div>", $r["status"], $r["name"]);
}}

## 3a-bad.php
<!DOCTYPE html>
<html>
  <head>
    <title>PHP MYSQL Injection Demo</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="x-dummy.css">
  </head>
  <body>
    <!-- (A) SEARCH FORM -->
    <form method="post">
      <p>* Search for any product normally - Will only extract products with <code>status=1</code>.</p>
      <p>* Then try <code>" OR 1=1 OR `name` LIKE "</code> - This will extract everything.</p>
      <input type="text" name="search">
      <input type="submit" value="Search">
    </form>

    <!-- (B) SEARCH RESULTS -->
    <div id="results"><?php
      if (isset($_POST["search"])) {
        $sql = "SELECT * FROM `products` WHERE `status`=1 AND `name` LIKE \"%".$_POST["search"]."%\"";
        $data = null;
        require "2-db.php";
      }
    ?></div>
  </body>
</html>

## 3b-good.php
<!DOCTYPE html>
<html>
  <head>
    <title>PHP MYSQL Injection Demo</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="x-dummy.css">
  </head>
  <body>
    <!-- (A) SEARCH FORM -->
    <form method="post">
      <p><code>" OR 1=1 OR `name` LIKE "</code> no longer works.</p>
      <input type="text" name="search">
      <input type="submit" value="Search">
    </form>

    <!-- (B) SEARCH RESULTS -->
    <div id="results"><?php
      if (isset($_POST["search"])) {
        $sql = "SELECT * FROM `products` WHERE `status`=1 AND `name` LIKE ?";
        $data = ["%".$_POST["search"]."%"];
        require "2-db.php";
      }
    ?></div>
  </body>
</html>

## 4-mysqli.php
<?php
// (A) CONNECT TO DATABASE - CHANGE SETTINGS TO YOUR OWN!
define("DB_HOST", "localhost");
define("DB_NAME", "test");
define("DB_USER", "root");
define("DB_PASSWORD", "");
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
if ($mysqli->connect_errno) { exit($mysqli->connect_error); }

// (B) PREPARE & BIND
$stmt = $mysqli->prepare("SELECT * FROM `products` WHERE `status`=1 AND `name` LIKE ?");
$search = "%".$_POST["search"]."%";
$stmt->bind_param("s", $search);

// (C) FETCH
$stmt->execute();
$stmt->bind_result($a, $b, $c);
while ($stmt->fetch()) { echo "<div>$a $b $c</div>"; }
mysqli_close($mysqli);

## x-dummy.css
/* NOT IMPORTANT - CSS COSMETICS */
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
form, #results {
  width: 400px;
  padding: 10px;
}
form {
  border: 1px solid #efefef;
  background: #f2f2f2;
}
code {
  font-family: Consolas, monospace;
  padding: 1px;
  background: #fff255;
}
input {
  display: block;
  width: 100%;
  padding: 10px;
}
input[type=text] {
  border: 1px solid #b9b9b9;
}
input[type=submit] {
  margin-top: 20px;
  border: 0;
  color: #fff;
  background: #b62323;
  cursor: pointer;
}
#results { margin-top: 20px; }
#results .sql {
  display: block;
  width: 100%;
  margin-bottom: 30px;
  font-weight: 700;
}
#results .row {
  padding: 10px;
  background: #eee;
}
#results .row:nth-child(odd) {
  background: #f7f7f7;
}
	-- (A) PRODUCTS TABLE
	CREATE TABLE `products` (
	`id` bigint(20) NOT NULL,
	`name` varchar(255) NOT NULL,
	`status` tinyint(4) NOT NULL DEFAULT 1
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

	ALTER TABLE `products`
	ADD PRIMARY KEY (`id`),
	ADD KEY `status` (`status`);

	ALTER TABLE `products`
	MODIFY `id` bigint(20) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;

	-- (B) DUMMY DATA
	INSERT INTO `products` (`id`, `name`, `status`) VALUES
	(1, 'Apple', 1),
	(2, 'Beet', 1),
	(3, 'Carrot', 0),
	(4, 'Dill', 1),
	(5, 'Eggplant', 1),
	(6, 'Feijoa', 0),
	(7, 'Grape', 0),
	(8, 'Hazelnut', 1),
	(9, 'Icaco', 1),
	(10, 'Jalapeno', 1);
	<?php
	// (A) DATABASE SETTINGS - CHANGE TO YOUR OWN!
	define("DB_HOST", "localhost");
	define("DB_NAME", "test");
	define("DB_CHARSET", "utf8mb4");
	define("DB_USER", "root");
	define("DB_PASSWORD", "");

	// (B) CONNECT TO DATABASE
	$pdo = new PDO(
	"mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
	DB_USER, DB_PASSWORD, [
	PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
	PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
	]);

	// (C) RUN SQL SEARCH
	$stmt = $pdo->prepare($sql);
	$stmt->execute($data);
	$results = $stmt->fetchAll();
	$stmt = null;
	$pdo = null;

	// (D) OUTPUT HTML RESULTS
	echo "<code class='sql'>$sql</code>";
	if (count($results)==0) { echo "<div class='row'>No results</div>"; }
	else { foreach($results as $r) {
	printf("<div class='row'>%u %s</div>", $r["status"], $r["name"]);
	}}
	<!DOCTYPE html>
	<html>
	<head>
	<title>PHP MYSQL Injection Demo</title>
	<meta charset="utf-8">
	<link rel="stylesheet" href="x-dummy.css">
	</head>
	<body>
	<!-- (A) SEARCH FORM -->
	<form method="post">
	<p>* Search for any product normally - Will only extract products with <code>status=1</code>.</p>
	<p>* Then try <code>" OR 1=1 OR `name` LIKE "</code> - This will extract everything.</p>
	<input type="text" name="search">
	<input type="submit" value="Search">
	</form>

	<!-- (B) SEARCH RESULTS -->
	<div id="results"><?php
	if (isset($_POST["search"])) {
	$sql = "SELECT * FROM `products` WHERE `status`=1 AND `name` LIKE \"%".$_POST["search"]."%\"";
	$data = null;
	require "2-db.php";
	}
	?></div>
	</body>
	</html>
	<?php
	// (A) CONNECT TO DATABASE - CHANGE SETTINGS TO YOUR OWN!
	define("DB_HOST", "localhost");
	define("DB_NAME", "test");
	define("DB_USER", "root");
	define("DB_PASSWORD", "");
	$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
	if ($mysqli->connect_errno) { exit($mysqli->connect_error); }

	// (B) PREPARE & BIND
	$stmt = $mysqli->prepare("SELECT * FROM `products` WHERE `status`=1 AND `name` LIKE ?");
	$search = "%".$_POST["search"]."%";
	$stmt->bind_param("s", $search);

	// (C) FETCH
	$stmt->execute();
	$stmt->bind_result($a, $b, $c);
	while ($stmt->fetch()) { echo "<div>$a $b $c</div>"; }
	mysqli_close($mysqli);
	/* NOT IMPORTANT - CSS COSMETICS */
	* {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	form, #results {
	width: 400px;
	padding: 10px;
	}
	form {
	border: 1px solid #efefef;
	background: #f2f2f2;
	}
	code {
	font-family: Consolas, monospace;
	padding: 1px;
	background: #fff255;
	}
	input {
	display: block;
	width: 100%;
	padding: 10px;
	}
	input[type=text] {
	border: 1px solid #b9b9b9;
	}
	input[type=submit] {
	margin-top: 20px;
	border: 0;
	color: #fff;
	background: #b62323;
	cursor: pointer;
	}
	#results { margin-top: 20px; }
	#results .sql {
	display: block;
	width: 100%;
	margin-bottom: 30px;
	font-weight: 700;
	}
	#results .row {
	padding: 10px;
	background: #eee;
	}
	#results .row:nth-child(odd) {
	background: #f7f7f7;
	}