Solved

Getting PHP to authenticate with LDAP correctly?

Posted on 2008-10-15
14
3,215 Views
Last Modified: 2013-12-19
Hello.

I'm testing connecting to the LDAP using PHP. I have found a script (see code snippet), although when trying to run it, it just keeps asking for a username and password and after 3 tries will just say Authorization Failed. Ive tried entering in different usernames and password but to no avail. We created a user called changepassword to test the script with.

Is there anything missing or anything that needs to be done on the server in order to get this to work?

Webserver - Windows XP using Xampp web server

Main server - Windows Server 2008

Any advice is appreciated.


<?php
 
$ldapconfig['host'] = 'alumwell-s.walsall.sch.uk';
$ldapconfig['port'] = NULL;
$ldapconfig['basedn'] = 'DC=Alumwell-s,DC=walsall,DC=sch,DC=uk';
$ldapconfig['authrealm'] = 'alumwell-s.walsall.sch.uk';
 
function ldap_authenticate() {
    global $ldapconfig;
    global $PHP_AUTH_USER;
    global $PHP_AUTH_PW;
    
    if ($PHP_AUTH_USER = "changepassword" && $PHP_AUTH_PW = "changeme") {
      $ds=@ldap_connect($ldapconfig['host']);
       $r = @ldap_search( $ds, $ldapconfig['basedn'], 'uid=' . $PHP_AUTH_USER);
       if ($r) {
          $result = @ldap_get_entries( $ds, $r);
          if ($result[0]) {
              if (@ldap_bind( $ds, $result[0]['dn'], $PHP_AUTH_PW) ) {
                 return $result[0];
          }
         }
       }
    }
    header('WWW-Authenticate: Basic realm="'.$ldapconfig['authrealm'].'"');
    header('HTTP/1.0 401 Unauthorized');
    return NULL;
}
 
if (($result = ldap_authenticate()) == NULL) {
    echo('Authorization Failed');
    exit(0);
}
echo('Authorization success');
print_r($result);
 
?>

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Comment
Question by:alumwell
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14 Comments
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22722620
What version of PHP?

Try $_SERVER['PHP_AUTH_USER'] and $_SERVER['PHP_AUTH_PW'


<?php
 
$ldapconfig['host'] = 'alumwell-s.walsall.sch.uk';
$ldapconfig['port'] = NULL;
$ldapconfig['basedn'] = 'DC=Alumwell-s,DC=walsall,DC=sch,DC=uk';
$ldapconfig['authrealm'] = 'alumwell-s.walsall.sch.uk';
 
function ldap_authenticate() {
    global $ldapconfig;
    
    if ($_SERVER['PHP_AUTH_USER'] = "changepassword" && $_SERVER['PHP_AUTH_PW'] = "changeme") {
      $ds=@ldap_connect($ldapconfig['host']);
       $r = @ldap_search( $ds, $ldapconfig['basedn'], 'uid=' . $_SERVER['PHP_AUTH_USER']);
       if ($r) {
          $result = @ldap_get_entries( $ds, $r);
          if ($result[0]) {
              if (@ldap_bind( $ds, $result[0]['dn'], $_SERVER['PHP_AUTH_PW']) ) {
                 return $result[0];
          }
         }
       }
    }
    header('WWW-Authenticate: Basic realm="'.$ldapconfig['authrealm'].'"');
    header('HTTP/1.0 401 Unauthorized');
    return NULL;
}
 
if (($result = ldap_authenticate()) == NULL) {
    echo('Authorization Failed');
    exit(0);
}
echo('Authorization success');
print_r($result);
 
?>

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Author Comment

by:alumwell
ID: 22728731
Thanks for your reply.

I have just tried that code although i am still getting the login box coming up:

-----------
The server localhost at alumwell-s.walsall.sch.uk requires a username and password.

Warning: This server is requesting that your username and password be sent in an insecure manner (basic authentication without a secure connection).
-----------

Any other ideas? Are there any settings that need to be turned on etc? Do i need to be logged on to a certain user? etc etc

Thanks.
0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22728958
Can you remove the @'s. These will hide any errors.

Add at the top of your script ...

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
set_time_limit(0);
//... Your code now ...

Let's see what else you may get.
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Author Comment

by:alumwell
ID: 22729103
Thank you for your reply.

I've put that code in and taken out the '@'s and i now get this error:

---------
Warning: ldap_search() [function.ldap-search]: Search: Operations error in C:\xampp\htdocs\test.php on line 17

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\test.php:17) in C:\xampp\htdocs\test.php on line 27

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\test.php:17) in C:\xampp\htdocs\test.php on line 28
Authorization Failed
---------

Is this a step forward? Any ideas now? Current code is attached.

Thanks again.
<?php
 
 error_reporting(E_ALL);
ini_set('display_errors', 1);
set_time_limit(0);
 
$ldapconfig['host'] = 'alumwell-s.walsall.sch.uk';
$ldapconfig['port'] = NULL;
$ldapconfig['basedn'] = 'DC=Alumwell-s,DC=walsall,DC=sch,DC=uk';
$ldapconfig['authrealm'] = 'alumwell-s.walsall.sch.uk';
 
function ldap_authenticate() {
    global $ldapconfig;
    
    if ($_SERVER['PHP_AUTH_USER'] = "changepassword" && $_SERVER['PHP_AUTH_PW'] = "changeme") {
      $ds=ldap_connect($ldapconfig['host']);
       $r = ldap_search( $ds, $ldapconfig['basedn'], 'uid=' . $_SERVER['PHP_AUTH_USER']);
       if ($r) {
          $result = ldap_get_entries( $ds, $r);
          if ($result[0]) {
              if (ldap_bind( $ds, $result[0]['dn'], $_SERVER['PHP_AUTH_PW']) ) {
                 return $result[0];
          }
         }
       }
    }
    header('WWW-Authenticate: Basic realm="'.$ldapconfig['authrealm'].'"');
    header('HTTP/1.0 401 Unauthorized');
    return NULL;
}
 
if (($result = ldap_authenticate()) == NULL) {
    echo('Authorization Failed');
    exit(0);
}
echo('Authorization success');
print_r($result);
 
?>

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0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22729427
You may find your ldap server isn't allowing anonymous connections / searching.

So you need to ldap_bind() right after ldap_connect().

By binding with the supplied credentials, you know if they are valid or not. No need to try and find the user first.

0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22729436
If you can't bind because you don't know the full DN, then you will need to bind using a set of known credentials first (I would recommend creating an account with readonly access to limited parts of the LDAP if that is possible).
0
 

Author Comment

by:alumwell
ID: 22730394
Gettin closer. Right, i now have the code that i will attach, i am getting this message:

-------------
Congratulations! changepassword is authenticated.
Warning: ldap_search() [function.ldap-search]: Search: Operations error in C:\xampp\htdocs\test2.php on line 25
Error in search query
------------

So there is something wrong with the search operation. Cannot figure out what though. The only thing i'm not sure about is the $query variable. Any ideas or advice?

Once again, thanks for your help.
<?php
$ldaphost = "alumwell-s.walsall.sch.uk";
$ldapport = 389;
 
$ds = ldap_connect($ldaphost, $ldapport)
or die("Could not connect to $ldaphost");
 
if ($ds)
{
    $username = "changepassword";
    $upasswd = "changeme";
 
    $ldapbind = ldap_bind($ds, $username, $upasswd);
                              
    if ($ldapbind)
        {print "Congratulations! $username is authenticated.";}
    else
        {print "Nice try, kid. Better luck next time!";}
}
 
// create the search string
$query = "(&(name=" . $_POST['name'] . "))";
 
ldap_search($ds,"DC=Alumwell-s,DC=walsall,DC=sch,DC=uk", $query) or die("Error in search
query");
 
// get entry data as array
$info = ldap_get_entries($ds, $result);
 
// iterate over array and print data for each entry
echo "<ul>";
for ($i=0; $i<$info["count"]; $i++)
{
echo "<li>".$info[$i]["sn"][0]." - ".$info[$i]["mail"][0]." -
".$info[$i]["dn"]."</li>"; } echo "</ul>";
 
// print number of entries found
echo "Number of entries found: " . ldap_count_entries($ds, $result) .
"<p>";
 
// all done? clean up
ldap_close($ds);
 
?>

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LVL 40

Expert Comment

by:Richard Quadling
ID: 22730650
Can you try ...

$query = "name={$_POST['name']}";
0
 

Author Comment

by:alumwell
ID: 22731436
Tried that to no avail. Says the same thing.

Any other suggestions are welcomed. Thanks again.
0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22731596
There is a difference between the login name and the name.

Try ...

$query = 'name=' . $_POST['name']{0} . '*';

This will wild card based upon the first letter of their name.

Also try ...

$query = "samaccountname={$_POST['name']}";

Is this to Active Directory (that's where I get samaccountname from).

For example, my login account name is RichardQ (samaccountname = RichardQ, but my name is Richard A. Quadling


0
 

Author Comment

by:alumwell
ID: 22731771
Well going on username i now have what is attached in the code snippet. A number of usernames start in st, so i've tried using the wildcard to get some results. But i still get the same error:

-------
Congratulations! changepassword is authenticated.
Warning: ldap_search() [function.ldap-search]: Search: Operations error in C:\xampp\htdocs\test2.php on line 27
Error in search query
------

line 27 being the 'ldap_search' line.

Any other ideas?

Thanks for your help so far.
<?php
$ldaphost = "alumwell-s.walsall.sch.uk";
$ldapport = 389;
 
$ds = ldap_connect($ldaphost, $ldapport)
or die("Could not connect to $ldaphost");
 
if ($ds)
{
    $username = "changepassword";
    $upasswd = "changeme";
 
    $ldapbind = ldap_bind($ds, $username, $upasswd);
                              
    if ($ldapbind)
        {print "Congratulations! $username is authenticated.";}
    else
        {print "Nice try, kid. Better luck next time!";}
}
 
 
 
// create the search string
$name = "st";
$query = "samaccountname=" . $name{0} . '*';
 
ldap_search($ds,"DC=Alumwell-s,DC=walsall,DC=sch,DC=uk", $query) or die("Error in search query");
 
// get entry data as array
$info = ldap_get_entries($ds, $result);
 
// iterate over array and print data for each entry
echo "<ul>";
for ($i=0; $i<$info["count"]; $i++)
{
echo "<li>".$info[$i]["sn"][0]." - ".$info[$i]["mail"][0]." -
".$info[$i]["dn"]."</li>"; } echo "</ul>";
 
 
 
 //print number of entries found
echo "Number of entries found: " . ldap_count_entries($ds, $result) .
"<p>";
 
 
 
// all done? clean up
ldap_close($ds);
 
?>

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LVL 40

Accepted Solution

by:
Richard Quadling earned 500 total points
ID: 22732069
ldap_search returns a resource.

Try using ...

$result = ldap_search(...);

http://docs.php.net/ldap_search
0
 

Author Comment

by:alumwell
ID: 22738394
Thanks. I had a look on that link and used what you'd said previously with it and i now have a working piece of code. Now i will have a go with it. Thanks again.
0
 
LVL 40

Expert Comment

by:Richard Quadling
ID: 22738637
Excellent.
0

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