[SOLVED] email injection

[slpctrl]

I've recently come across a problem with email injection, and the injection of additional email headers in my contact page. I'm a bit rusty with PHP, I found this function on the web to prevent it:

 

 
<?php
//email injection prevention function

function mailcheck($input) {
if (eregi(”\r”, $input) ||
eregi(”\n”, $input) ||
eregi(”%0a”, $input) ||
eregi(”%0d”, $input) ||
eregi(”Content-Type:”, $input) ||
eregi(”bcc:”, $input) ||
eregi(”to:”, $input) ||
eregi(”cc:”, $input)) {
return true;
} else {
return false;
}
}

$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];

Now, that's what I've got so far on my new script. How can I alert a message box notifying of illegal characters if mailcheck returns false, and allow it to mail if it returns true? Thanks in advance 

[DeanWhitehouse]

I would look at the w3school tutorial on it , as it may be better and more secure.

 

And to do what you want add

 

if(!mailcheck('$email'))

{

?>

<script type="javascript">

alert("Invalid");

</script>

<?php

}

else

{

//mail

}

[kenrbnsn]

Nine times out of ten (or more), email injections are coming from programs, not people. Don't even bother with an error message, just end your script. The programs are made by hackers who screen scraped your generated source.

 

Ken

[slpctrl]

Nine times out of ten (or more), email injections are coming from programs, not people. Don't even bother with an error message, just end your script. The programs are made by hackers who screen scraped your generated source.

 

Ken

 

Yeah, I know. Here is my more secure script:

 

<?php
function mailcheck($input) {
if (eregi(”\r”, $input) ||
eregi(”\n”, $input) ||
eregi(”%0a”, $input) ||
eregi(”%0d”, $input) ||
eregi(”Content-Type:”, $input) ||
eregi(”bcc:”, $input) ||
eregi(”to:”, $input) ||
eregi(”cc:”, $input)) {
return true;
} else {
return false;
}
}
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$msg = "Name: $name<br>Email Address: $email<br>Message: $message";

if(!mailcheck($email) || !mailcheck($email))
die();
else
{
mail("[email protected]","Website Inquiry",$msg);
header('location: index.htm');
}
?>