У меня есть контактная форма на моем сайте, и все работает как шарм. Я использую сценарий проверки антиинъекции, который, как я подозреваю, должен отправить уведомление, когда кто-то пытается использовать инъекцию заголовка. Я проверил это тщательно и не могу определить, почему он не уведомит меня в случае злоупотребления. Сценарий ниже.
<?php
/* Set e-mail recipient */
$myemail = "email@gmail.com";
/* Check all form inputs using check_input function */
$subject = check_input($_POST['subject'], "Please enter your name");
$email = check_input($_POST['email'], "Please enter your email");
$form = check_input($_POST['form'], "Please write your message");
function logbad($value)
{
// Start of validation; this is where the problem is
$report_to = "email@gmail.com";
$name = "Matt";
$mail = "$email";
// replace this with your own get_ip function...
$ip = (empty($_SERVER['REMOTE_ADDR'])) ? 'empty'
: $_SERVER['REMOTE_ADDR'];
$rf = (empty($_SERVER['HTTP_REFERER'])) ? 'empty'
: $_SERVER['HTTP_REFERER'];
$ua = (empty($_SERVER['HTTP_USER_AGENT'])) ? 'empty'
: $_SERVER['HTTP_USER_AGENT'];
$ru = (empty($_SERVER['REQUEST_URI'])) ? 'empty'
: $_SERVER['REQUEST_URI'];
$rm = (empty($_SERVER['REQUEST_METHOD'])) ? 'empty'
: $_SERVER['REQUEST_METHOD'];
$headers = "MIME-Version: 1.0\n";
$headers .= "Content-type: text/plain; charset=iso-8859-1\n";
$headers .= "X-Priority: 1\n";
$headers .= "X-MSMail-Priority: Normal\n";
$headers .= "X-Mailer: php\n";
$headers .= "From: \"".$nama."\" <".$mail.">\r\n\r\n";
@mail
(
$report_to
,"[ABUSE] mailinjection @ " .
$_SERVER['HTTP_HOST'] . " by " . $ip
,"Stopped possible mail-injection @ " .
$_SERVER['HTTP_HOST'] . " by " . $ip .
" (" . date('d/m/Y H:i:s') . ")\r\n\r\n" .
"*** IP/HOST\r\n" . $ip . "\r\n\r\n" .
"*** USER AGENT\r\n" . $ua . "\r\n\r\n" .
"*** REFERER\r\n" . $rf . "\r\n\r\n" .
"*** REQUEST URI\r\n" . $ru . "\r\n\r\n" .
"*** REQUEST METHOD\r\n" . $rm . "\r\n\r\n" .
"*** SUSPECT\r\n--\r\n" . $value . "\r\n--"
,$headers
);
}
// Check 1
//First, make sure the form was posted from a browser.
// For basic web-forms, we don't care about anything
// other than requests from a browser:
if(!isset($_SERVER['HTTP_USER_AGENT']))
{
die('Forbidden - You are not authorized to view this page (0)');
exit;
}
// Cek 2
// Make sure the form was indeed POST'ed:
// (requires your html form to use: action="post")
if(!$_SERVER['REQUEST_METHOD'] == "POST")
{
die('Forbidden - You are not authorized to view this page (1)');
exit;
}
// Host names from where the form is authorized
// to be posted from:
$authHosts = array("cover.com");
// Where have we been posted from?
$fromArray = parse_url(strtolower($_SERVER['HTTP_REFERER']));
// Test to see if the $fromArray used www to get here.
$wwwUsed = strpos($fromArray['host'], "www.");
// Make sure the form was posted from an approved host name.
if(!in_array(($wwwUsed === false ? $fromArray['host'] : substr(stristr($fromArray['host'], '.'), 1)), $authHosts))
{
logbad("Form was not posted from an approved host name");
die(' Forbidden - You are not authorized to view this page (2)');
exit;
}
// Attempt to defend against header injections:
$badStrings = array("content-type:",
"mime-version:",
"content-transfer-encoding:",
"multipart/mixed",
"charset=",
"bcc:",
"cc:");
// Loop through each POST'ed value and test if it contains
// one of the $badStrings:
foreach($_POST as $k => $v)
{
foreach($badStrings as $v2)
{
if(strpos(strtolower($v), $v2) !== false)
{
logbad($v);
die('<strong>Form processing cancelled:<br /></strong> string
(`'.$v.'`)<strong> contains text portions that
are potentially harmful to this server. <br />Your input
has not been sent! <br />Please use your browser\'s
`back`-button to return to the previous page and try
rephrasing your input.</strong>');
exit;
}
}
}
// Made it past spammer test, free up some memory
// and continuing the rest of script:
unset($k, $v, $v2, $badStrings, $authHosts, $fromArray, $wwwUsed);
/* If e-mail is not valid show error message */
$addr_spec = '([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c'.
'\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d'.
'\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22)'.
'(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e'.
'\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|'.
'\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c\\x00'.
'-\\x7f)*\\x22))*\\x40([^\\x00-\\x20\\x22\\x28'.
'\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d'.
'\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff'.
']|\\x5c[\\x00-\\x7f])*\\x5d)(\\x2e([^\\x00-\\x20'.
'\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40'.
'\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-'.
'\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d))*';
if (!preg_match("!^$addr_spec$!", $email))
{
show_error("E-mail address not valid");
}
if (strtolower($_POST['code']) != 'rowingcover') {die('The following error occured: <br />Wrong anti-spam code. <br />
<a href="javascript:history.go(-1)">Go back</a>');}
/* Let's prepare the message for the e-mail */
$message = "Cover.com Contact Form
From:
$subject
$email
Message
$form
";
/* Send the message using mail() function */
mail($myemail, $subject, $message, "From: $email");
/* Redirect visitor to the thank you page */
header('Location: contact_received.html');
exit();
/* Functions we used */
function check_input($data, $problem='')
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
if ($problem && strlen($data) == 0)
{
show_error($problem);
}
return $data;
}
function show_error($myError)
{
?>
<html>
<body>
<b>Please correct the following error:</b><br />
<?php echo $myError; ?><br />
<a href="javascript:history.go(-1)">Go back</a>
</body>
</html>
<?php
exit();
}
?>
Я относительно новичок в php, поэтому любая помощь будет принята с благодарностью.
Спасибо,
Matt