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Laat ook even zien wat je aan code hebt.
Dat helpt wat makkelijker.
Gewijzigd op 10/11/2015 21:19:43 door - Ariën -
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<?php
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
}
}
?>
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
}
}
?>
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<?php
$msg= $sql;
$msg= "INSERT INTO students (name, _email, city)
VALUES ('".$_POST["name"]."','".$_POST["email"]."','".$_POST["city"]."')";
?>
$msg= $sql;
$msg= "INSERT INTO students (name, _email, city)
VALUES ('".$_POST["name"]."','".$_POST["email"]."','".$_POST["city"]."')";
?>
Dit ondere is dan wat ik daarboven bij $msg heb ingevuld.
Gewijzigd op 10/11/2015 21:21:12 door Marcel Groot
$msg is niets meer dan een container waar het bericht wordt geplaatst of de captcha goed/fout is.
Je kan na die $msg regel prima je queries uitvoeren.
Let wel op SQL-injection, als je $_POST, $_GET en en/of $_COOKIE variabelen gaat gebruiken.
Je kan het beste mysqli_real_escape_string() gebruiken in combinatie met de MySQLi-functies
Code (php)
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<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
// hier je controles formulier validatie e.d.
// hier je CAPTCHA dingetje als alles klopt
if($captcha === true)
{
// dit kan.
$msg= "<span style='color:green'>The Validation code has been matched.</span>";
// nu kunnen we alles veilig doen.. hier alleen nog wel wat tegen SQL injection doen, want ander is dit lek
$sql = "INSERT INTO students (name, _email, city)
VALUES ('".$_POST["name"]."','".$_POST["email"]."','".$_POST["city"]."')";
// query uitvoeren
}
}
?>
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
// hier je controles formulier validatie e.d.
// hier je CAPTCHA dingetje als alles klopt
if($captcha === true)
{
// dit kan.
$msg= "<span style='color:green'>The Validation code has been matched.</span>";
// nu kunnen we alles veilig doen.. hier alleen nog wel wat tegen SQL injection doen, want ander is dit lek
$sql = "INSERT INTO students (name, _email, city)
VALUES ('".$_POST["name"]."','".$_POST["email"]."','".$_POST["city"]."')";
// query uitvoeren
}
}
?>
Als je $sql in $msg zet, dan kan je uren turen naar je scherm, maar dat doet ie niet.
Toevoeging op 12/11/2015 17:15:50:
Dus ik kan al mijn php hier gewoon in zetten
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<?php session_start();
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
HIER
}
}
?>
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
HIER
}
}
?>
Gewijzigd op 12/11/2015 17:14:42 door Marcel Groot
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<?php session_start();
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
$servername = "";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES ('".$_POST["student_name"]."','".$_POST["student_email"]."','".$_POST["student_city"]."')";
if ($conn->query($sql) === TRUE) {
echo "<script type= 'text/javascript'>alert('New record created successfully');</script>";
} else {
echo "<script type= 'text/javascript'>alert('Error: " . $sql . "<br>" . $conn->error."');</script>";
}
$collection= array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
$fruit = array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
if(isset($_POST['submit']))
{ $fruit = $_POST['fruit'];
$values = array($collection);
foreach($collection as $selection )
{ if(in_array($selection, $fruit))
{ $values[ $selection ] = 1; }
else
{ $values[ $selection ] = 0; }
} // end of foreach.
// MySQL statement.
$insert = "INSERT INTO table_fruit (orange, apple, grapefruit, banana, watermelon)
VALUES ({$values['orange']}, {$values['apple']}, {$values['grapefruit']}, {$values['banana']}, {$values['watermelon']})";
// MySQL statement to execute the INSERT statement above.
mysqli_query($conn, $insert) or die('<br/>Error reading database: '.mysqli_error($dbconnect));
mysqli_close($conn);
} // End of, if statement from the button check
;
}
}
?>
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
$servername = "";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES ('".$_POST["student_name"]."','".$_POST["student_email"]."','".$_POST["student_city"]."')";
if ($conn->query($sql) === TRUE) {
echo "<script type= 'text/javascript'>alert('New record created successfully');</script>";
} else {
echo "<script type= 'text/javascript'>alert('Error: " . $sql . "<br>" . $conn->error."');</script>";
}
$collection= array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
$fruit = array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
if(isset($_POST['submit']))
{ $fruit = $_POST['fruit'];
$values = array($collection);
foreach($collection as $selection )
{ if(in_array($selection, $fruit))
{ $values[ $selection ] = 1; }
else
{ $values[ $selection ] = 0; }
} // end of foreach.
// MySQL statement.
$insert = "INSERT INTO table_fruit (orange, apple, grapefruit, banana, watermelon)
VALUES ({$values['orange']}, {$values['apple']}, {$values['grapefruit']}, {$values['banana']}, {$values['watermelon']})";
// MySQL statement to execute the INSERT statement above.
mysqli_query($conn, $insert) or die('<br/>Error reading database: '.mysqli_error($dbconnect));
mysqli_close($conn);
} // End of, if statement from the button check
;
}
}
?>
In dat geval bestaan die $_POST variabelen niet, omdat die formuliervelden niet bestaan.
Verder mis er beveiliging tegen SQL-injection en ben je nu behoorlijk goed hackbaar:
Code (php)
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<?php
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES(
'".$conn->real_escape_string($_POST["student_name"])."',
'".$conn->real_escape_string($_POST["student_email"])."',
'".$conn->real_escape_string($_POST["student_city"])."'
)";
?>
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES(
'".$conn->real_escape_string($_POST["student_name"])."',
'".$conn->real_escape_string($_POST["student_email"])."',
'".$conn->real_escape_string($_POST["student_city"])."'
)";
?>
Gewijzigd op 12/11/2015 19:31:48 door - Ariën -
Notice: Undefined index: student_email on line 24
Notice: Undefined index: student_city on line 25
Toevoeging op 12/11/2015 19:54:07:
Marcel Groot op 12/11/2015 19:53:26:
Notice: Undefined index: student_name on line 23
Notice: Undefined index: student_email on line 24
Notice: Undefined index: student_city on line 25
Notice: Undefined index: student_email on line 24
Notice: Undefined index: student_city on line 25
Code (php)
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<?php session_start();
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
$servername = "";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES(
'".$conn->real_escape_string($_POST["student_name"])."',
'".$conn->real_escape_string($_POST["student_email"])."',
'".$conn->real_escape_string($_POST["student_city"])."'
)";
if ($conn->query($sql) === TRUE) {
echo "<script type= 'text/javascript'>alert('New record created successfully');</script>";
} else {
echo "<script type= 'text/javascript'>alert('Error: " . $sql . "<br>" . $conn->error."');</script>";
}
$collection= array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
$fruit = array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
if(isset($_POST['submit']))
{ $fruit = $_POST['fruit'];
$values = array($collection);
foreach($collection as $selection )
{ if(in_array($selection, $fruit))
{ $values[ $selection ] = 1; }
else
{ $values[ $selection ] = 0; }
} // end of foreach.
// MySQL statement.
$insert = "INSERT INTO table_fruit (orange, apple, grapefruit, banana, watermelon)
VALUES ({$values['orange']}, {$values['apple']}, {$values['grapefruit']}, {$values['banana']}, {$values['watermelon']})";
// MySQL statement to execute the INSERT statement above.
mysqli_query($conn, $insert) or die('<br/>Error reading database: '.mysqli_error($dbconnect));
mysqli_close($conn);
} // End of, if statement from the button check
;
}
}
?>
if(isset($_POST['Submit'])){
// code for check server side validation
if(empty($_SESSION['captcha_code'] ) || strcasecmp($_SESSION['captcha_code'], $_POST['captcha_code']) != 0){
$msg="<span style='color:red'>The Validation code does not match!</span>";// Captcha verification is incorrect.
}else{// Captcha verification is Correct. Final Code Execute here!
$msg="<span style='color:green'>The Validation code has been matched.</span>";
$servername = "";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO students (student_name, student_email, student_city)
VALUES(
'".$conn->real_escape_string($_POST["student_name"])."',
'".$conn->real_escape_string($_POST["student_email"])."',
'".$conn->real_escape_string($_POST["student_city"])."'
)";
if ($conn->query($sql) === TRUE) {
echo "<script type= 'text/javascript'>alert('New record created successfully');</script>";
} else {
echo "<script type= 'text/javascript'>alert('Error: " . $sql . "<br>" . $conn->error."');</script>";
}
$collection= array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
$fruit = array('orange', 'apple', 'grapefruit', 'banana', 'watermelon');
if(isset($_POST['submit']))
{ $fruit = $_POST['fruit'];
$values = array($collection);
foreach($collection as $selection )
{ if(in_array($selection, $fruit))
{ $values[ $selection ] = 1; }
else
{ $values[ $selection ] = 0; }
} // end of foreach.
// MySQL statement.
$insert = "INSERT INTO table_fruit (orange, apple, grapefruit, banana, watermelon)
VALUES ({$values['orange']}, {$values['apple']}, {$values['grapefruit']}, {$values['banana']}, {$values['watermelon']})";
// MySQL statement to execute the INSERT statement above.
mysqli_query($conn, $insert) or die('<br/>Error reading database: '.mysqli_error($dbconnect));
mysqli_close($conn);
} // End of, if statement from the button check
;
}
}
?>
Laat je formulier eens zien.
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<?php
<html>
<head>
<meta charset="utf-8">
<title>PHP Secure Professional Captcha.</title>
<link href="./css/style.css" rel="stylesheet">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
</head>
<body>
<div>
<form action="" method="post" name="form1" id="form1" >
<input type="checkbox" name="fruit[Orange]" value="orange"> Orange
<input type="checkbox" name="fruit[Apple]" value="apple"> Apple
<input type="checkbox" name="fruit[Grapefruit]" value="grapefruit"> Grapefruit
<input type="checkbox" name="fruit[Banana]" value="banana"> Banana
<input type="checkbox" name="fruit[Watermelon]" value="watermelon"> Watermelon
<label>Student Name :</label>
<input type="text" name="student_name" id="name" required="required" placeholder="Please Enter Name"/><br /><br />
<label>Student Email :</label>
<input type="email" name="student_email" id="email" required="required" placeholder="[email protected]"/><br/><br />
<label>Student City :</label>
<input type="text" name="student_city" id="city" required="required" placeholder="Please Enter Your City"/><br/><br />
</form>
</div>
<meta charset="utf-8">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
<form action="" method="post" name="form1" id="form1" >
<table width="400" border="0" align="center" cellpadding="5" cellspacing="1" class="table">
<?php if(isset($msg)){?>
<tr>
<td colspan="2" align="center" valign="top"><?php echo $msg;?></td>
</tr>
<?php } ?>
<tr>
<td align="right" valign="top"> Validation code:</td>
<td><img src="captcha.php?rand=<?php echo rand();?>" id='captchaimg'><br>
<label for='message'>Enter the code above here :</label>
<br>
<input id="captcha_code" name="captcha_code" type="text">
<br>
Can't read the image? click <a href='javascript: refreshCaptcha();'>here</a> to refresh.</td>
</tr>
<tr>
<td> </td>
<td><input name="Submit" type="submit" value="Submit" class="button1"></td>
</tr>
</table>
</form>
</body>
</html>
?>
<html>
<head>
<meta charset="utf-8">
<title>PHP Secure Professional Captcha.</title>
<link href="./css/style.css" rel="stylesheet">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
</head>
<body>
<div>
<form action="" method="post" name="form1" id="form1" >
<input type="checkbox" name="fruit[Orange]" value="orange"> Orange
<input type="checkbox" name="fruit[Apple]" value="apple"> Apple
<input type="checkbox" name="fruit[Grapefruit]" value="grapefruit"> Grapefruit
<input type="checkbox" name="fruit[Banana]" value="banana"> Banana
<input type="checkbox" name="fruit[Watermelon]" value="watermelon"> Watermelon
<label>Student Name :</label>
<input type="text" name="student_name" id="name" required="required" placeholder="Please Enter Name"/><br /><br />
<label>Student Email :</label>
<input type="email" name="student_email" id="email" required="required" placeholder="[email protected]"/><br/><br />
<label>Student City :</label>
<input type="text" name="student_city" id="city" required="required" placeholder="Please Enter Your City"/><br/><br />
</form>
</div>
<meta charset="utf-8">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
<form action="" method="post" name="form1" id="form1" >
<table width="400" border="0" align="center" cellpadding="5" cellspacing="1" class="table">
<?php if(isset($msg)){?>
<tr>
<td colspan="2" align="center" valign="top"><?php echo $msg;?></td>
</tr>
<?php } ?>
<tr>
<td align="right" valign="top"> Validation code:</td>
<td><img src="captcha.php?rand=<?php echo rand();?>" id='captchaimg'><br>
<label for='message'>Enter the code above here :</label>
<br>
<input id="captcha_code" name="captcha_code" type="text">
<br>
Can't read the image? click <a href='javascript: refreshCaptcha();'>here</a> to refresh.</td>
</tr>
<tr>
<td> </td>
<td><input name="Submit" type="submit" value="Submit" class="button1"></td>
</tr>
</table>
</form>
</body>
</html>
?>
Je stuurt nu waarschijnlijk alleen het tweede.
Maak er 1 van.
Toevoeging op 12/11/2015 20:34:23:
Daarnaast is dit niet een beetje een rommeltje? (al wel wat kan ik weg halen over verbeteren?)
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<?php
<html>
<head>
<meta charset="utf-8">
<title>Testwebsite</title>
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
</head>
<body>
<div>
<form action="" method="post" name="form1" id="form1" >
<input type="checkbox" name="fruit[Orange]" value="orange"> Orange
<input type="checkbox" name="fruit[Apple]" value="apple"> Apple
<input type="checkbox" name="fruit[Grapefruit]" value="grapefruit"> Grapefruit
<input type="checkbox" name="fruit[Banana]" value="banana"> Banana
<input type="checkbox" name="fruit[Watermelon]" value="watermelon"> Watermelon
<br>
<label>Student Name :</label>
<input type="text" name="student_name" id="name" required="required" placeholder="Please Enter Name"/><br /><br />
<label>Student Email :</label>
<input type="email" name="student_email" id="email" required="required" placeholder="[email protected]"/><br/><br />
<label>Student City :</label>
<input type="text" name="student_city" id="city" required="required" placeholder="Please Enter Your City"/><br/><br />
</div>
<meta charset="utf-8">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
<?php if(isset($msg)){?>
<?php echo $msg;?></td>
<?php } ?>
Validation code:
<img src="captcha.php?rand=<?php echo rand();?>" id='captchaimg'><br>
<label for='message'>Enter the code above here :</label>
<br>
<input id="captcha_code" name="captcha_code" type="text">
<br>
Can't read the image? click <a href='javascript: refreshCaptcha();'>here</a> to refresh.</td>
<input name="Submit" type="submit" value="Submit">
</form>
</body>
</html>
?>
<html>
<head>
<meta charset="utf-8">
<title>Testwebsite</title>
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
</head>
<body>
<div>
<form action="" method="post" name="form1" id="form1" >
<input type="checkbox" name="fruit[Orange]" value="orange"> Orange
<input type="checkbox" name="fruit[Apple]" value="apple"> Apple
<input type="checkbox" name="fruit[Grapefruit]" value="grapefruit"> Grapefruit
<input type="checkbox" name="fruit[Banana]" value="banana"> Banana
<input type="checkbox" name="fruit[Watermelon]" value="watermelon"> Watermelon
<br>
<label>Student Name :</label>
<input type="text" name="student_name" id="name" required="required" placeholder="Please Enter Name"/><br /><br />
<label>Student Email :</label>
<input type="email" name="student_email" id="email" required="required" placeholder="[email protected]"/><br/><br />
<label>Student City :</label>
<input type="text" name="student_city" id="city" required="required" placeholder="Please Enter Your City"/><br/><br />
</div>
<meta charset="utf-8">
<script type='text/javascript'>
function refreshCaptcha(){
var img = document.images['captchaimg'];
img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
}
</script>
<?php if(isset($msg)){?>
<?php echo $msg;?></td>
<?php } ?>
Validation code:
<img src="captcha.php?rand=<?php echo rand();?>" id='captchaimg'><br>
<label for='message'>Enter the code above here :</label>
<br>
<input id="captcha_code" name="captcha_code" type="text">
<br>
Can't read the image? click <a href='javascript: refreshCaptcha();'>here</a> to refresh.</td>
<input name="Submit" type="submit" value="Submit">
</form>
</body>
</html>
?>
Je kan het beste mysqli_real_escape_string() gebruiken in combinatie met de MySQLi-functies
Hoe kan ik dat dan beveiligen?
Let er wel op dat dit Object Oriënted is.
Als je procedureel gebruikt (mysqli_query() etc..), dan is het
Code (php)
1
mysqli_real_escape_string($conn, $_POST['student_city'])
Gewijzigd op 13/11/2015 16:12:49 door - Ariën -
Marcel Groot op 13/11/2015 16:05:02:
Hoe kan ik dat dan beveiligen?
Door:
Marcel Groot op 13/11/2015 16:05:02:
Je kan het beste mysqli_real_escape_string() gebruiken in combinatie met de MySQLi-functies
Volg eens een tut, gebruik Google. Er is heel veel te vinden aan informatie hierover. Ook topics op dit forum.
Wat betreft je code: op regel 38, 39 en 40 open je PHP en sluit je af. Waarom?
Wat is de reden van regel 31?
Ik zou javascript niet midden in een pagina zetten. De javascript functie lijkt er overigens 2x in te staan.
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