PHP_AUTH_DIGEST not working ?

[Asger Joergensen]

Hi

Anybody know why the example below from the php manual doesn't work ?
it brings up a password dialog, but instead of logging in it
shows the password dialog again and again.

I know this is normally done using .htaccess, but my provider only
support authtype Basic, so I thought I would try the php way.

Any advice ?

Thanks in advance
Best regards
Asger-P
http://Asger-P.dk/software



<?php
$realm = 'Restricted area';

//user => password
$users = array('admin' => 'mypass', 'guest' => 'guest');


if (empty($_SERVER['PHP_AUTH_DIGEST'])) {
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Digest realm="'.$realm.
'",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');

die('Text to send if user hits Cancel button');
}


// analyze the PHP_AUTH_DIGEST variable
if (!($data = http_digest_parse($_SERVER['PHP_AUTH_DIGEST'])) ||
!isset($users[$data['username']]))
die('Wrong Credentials!');


// generate the valid response
$A1 = md5($data['username'] . ':' . $realm . ':' . $users[$data['username']]);
$A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
$valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);

if ($data['response'] != $valid_response)
die('Wrong Credentials!');

// ok, valid username & password
echo 'You are logged in as: ' . $data['username'];


// function to parse the http auth header
function http_digest_parse($txt)
{
// protect against missing data
$needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
$data = array();
$keys = implode('|', array_keys($needed_parts));

preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]+?)\2|([^\s,]+))@', $txt, $matches, PREG_SET_ORDER);

foreach ($matches as $m) {
$data[$m[1]] = $m[3] ? $m[3] : $m[4];
unset($needed_parts[$m[1]]);
}

return $needed_parts ? false : $data;
}
?>

[Jerry Stuckle]

> // ok, valid username& password

> echo 'You are logged in as: ' . $data['username'];
>
>
> // function to parse the http auth header
> function http_digest_parse($txt)
> {
> // protect against missing data
> $needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
> $data = array();
> $keys = implode('|', array_keys($needed_parts));
>
> preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]+?)\2|([^\s,]+))@', $txt, $matches, PREG_SET_ORDER);
>
> foreach ($matches as $m) {
> $data[$m[1]] = $m[3] ? $m[3] : $m[4];
> unset($needed_parts[$m[1]]);
> }
>
> return $needed_parts ? false : $data;
> }
> ?>

Is your browser sending an AUTH_DIGEST header?

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstu...@attglobal.net
==================

[Asger Joergensen]

Hi Jerry

Jerry Stuckle wrote:

> Is your browser sending an AUTH_DIGEST header?

I don't know, how can I check that, I'm not on the site yet so
I cant see anything that I echo.

but I do know that it never leaves the first if:
if( empty( $_SERVER['PHP_AUTH_DIGEST'] ) )

{
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Digest realm="'.$realm.
'",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');

die('Text to send if user hits Cancel button');
}

because after 3 attempts I get rejected and this message is shown

'Text to send if user hits Cancel button'

p.s. it's the same in Chrome, IE and Opera.

Thanks for Your answer.

[Jerry Stuckle]

On 3/27/2012 8:51 AM, Asger Joergensen wrote:
> Hi Jerry
>
> Jerry Stuckle wrote:
>
>> Is your browser sending an AUTH_DIGEST header?
>
> I don't know, how can I check that, I'm not on the site yet so
> I cant see anything that I echo.
>
> but I do know that it never leaves the first if:
> if( empty( $_SERVER['PHP_AUTH_DIGEST'] ) )
> {
> header('HTTP/1.1 401 Unauthorized');
> header('WWW-Authenticate: Digest realm="'.$realm.
> '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
>
> die('Text to send if user hits Cancel button');
> }
>
> because after 3 attempts I get rejected and this message is shown
> 'Text to send if user hits Cancel button'
>
> p.s. it's the same in Chrome, IE and Opera.
>

Well, if you don't know if the client is sending a digest authorization
header, then you can't go very far. Try printing out some values - like
$_SERVER['PHP_AUTH_DIGEST']. Better yet, get the Live HTTP Headers
plugin for Firefox and see what's being received and sent.

I suspect since your hosting company doesn't support digest
authentication, the client never sends this type of header. But I don't
know for sure; all my systems support digest authentication.

Maybe it's time to get a new host. Digest authentication is pretty
basic to Apache.