Simple PHP login script that authenticates through Active Directory using LDAP.
Checks user’s membership for two groups, and assigns permissions to a session variable.
authenticate.php
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<?php
function authenticate($user, $password) {
// Active Directory server
$ldap_host = "server.college.school.edu";
// Active Directory DN
$ldap_dn = "OU=Departments,DC=college,DC=school,DC=edu";
// Active Directory user group
$ldap_user_group = "WebUsers";
// Active Directory manager group
$ldap_manager_group = "WebManagers";
// Domain, for purposes of constructing $user
$ldap_usr_dom = "@college.school.edu";
// connect to active directory
$ldap = ldap_connect($ldap_host);
// verify user and password
if($bind = @ldap_bind($ldap, $user . $ldap_usr_dom, $password)) {
// valid
// check presence in groups
$filter = "(sAMAccountName=" . $user . ")";
$attr = array("memberof");
$result = ldap_search($ldap, $ldap_dn, $filter, $attr) or exit("Unable to search LDAP server");
$entries = ldap_get_entries($ldap, $result);
ldap_unbind($ldap);
// check groups
foreach($entries[0]['memberof'] as $grps) {
// is manager, break loop
if (strpos($grps, $ldap_manager_group)) { $access = 2; break; }
// is user
if (strpos($grps, $ldap_user_group)) $access = 1;
}
if ($access != 0) {
// establish session variables
$_SESSION['user'] = $user;
$_SESSION['access'] = $access;
return true;
} else {
// user has no rights
return false;
}
} else {
// invalid name or password
return false;
}
}
?> |
login.php:
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<?php
include("authenticate.php");
// check to see if user is logging out
if(isset($_GET['out'])) {
// destroy session
session_unset();
$_SESSION = array();
unset($_SESSION['user'],$_SESSION['access']);
session_destroy();
}
// check to see if login form has been submitted
if(isset($_POST['userLogin'])){
// run information through authenticator
if(authenticate($_POST['userLogin'],$_POST['userPassword']))
{
// authentication passed
header("Location: index.php");
die();
} else {
// authentication failed
$error = 1;
}
}
// output error to user
if (isset($error)) echo "Login failed: Incorrect user name, password, or rights<br />";
// output logout success
if (isset($_GET['out'])) echo "Logout successful<br />";
?>
<form method="post" action="login.php">
User: <input type="text" name="userLogin" /><br />
Password: <input type="password" name="userPassword" /><br />
<input type="submit" name="submit" value="Submit" />
</form> |
Related Post: Use PHP and LDAP to list members of an Active Directory group
