friendica-addons/ldapauth/ldapauth.php

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<?php
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/**
* Name: LDAP Authenticate
* Description: Authenticate a user against an LDAP directory
* Version: 1.1
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* Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
* Author: aymhce
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*/
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/**
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* Friendica addon
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*
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* Module: LDAP Authenticate
*
* Authenticate a user against an LDAP directory
* Useful for Windows Active Directory and other LDAP-based organisations
* to maintain a single password across the organisation.
*
* Optionally authenticates only if a member of a given group in the directory.
*
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* By default, the person must have registered with Friendica using the normal registration
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* procedures in order to have a Friendica user record, contact, and profile.
* However, it's possible with an option to automate the creation of a Friendica basic account.
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*
* Note when using with Windows Active Directory: you may need to set TLS_CACERT in your site
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* ldap.conf file to the signing cert for your LDAP server.
*
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* The configuration options for this module may be set in the .htconfig.php file
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* e.g.:
*
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* // ldap hostname server - required
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* $a->config['ldapauth']['ldap_server'] = 'host.example.com';
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* // dn to search users - required
* $a->config['ldapauth']['ldap_searchdn'] = 'ou=users,dc=example,dc=com';
* // attribute to find username - required
* $a->config['ldapauth']['ldap_userattr'] = 'uid';
*
* // admin dn - optional - only if ldap server dont have anonymous access
* $a->config['ldapauth']['ldap_binddn'] = 'cn=admin,dc=example,dc=com';
* // admin password - optional - only if ldap server dont have anonymous access
* $a->config['ldapauth']['ldap_bindpw'] = 'password';
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*
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* // for create Friendica account if user exist in ldap
* // required an email and a simple (beautiful) nickname on user ldap object
* // active account creation - optional - default none
* $a->config['ldapauth']['ldap_autocreateaccount'] = 'true';
* // attribute to get email - optional - default : 'mail'
* $a->config['ldapauth']['ldap_autocreateaccount_emailattribute'] = 'mail';
* // attribute to get nickname - optional - default : 'givenName'
* $a->config['ldapauth']['ldap_autocreateaccount_nameattribute'] = 'cn';
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*
* ...etc.
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*/
use Friendica\Core\Config;
use Friendica\Model\User;
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function ldapauth_install()
{
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register_hook('authenticate', 'addon/ldapauth/ldapauth.php', 'ldapauth_hook_authenticate');
}
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function ldapauth_uninstall()
{
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unregister_hook('authenticate', 'addon/ldapauth/ldapauth.php', 'ldapauth_hook_authenticate');
}
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function ldapauth_hook_authenticate($a, &$b)
{
if (ldapauth_authenticate($b['username'], $b['password'])) {
$results = get_existing_account($b['username']);
if (!empty($results)) {
$b['user_record'] = $results[0];
$b['authenticated'] = 1;
}
}
return;
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}
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function ldapauth_authenticate($username, $password)
{
$ldap_server = Config::get('ldapauth', 'ldap_server');
$ldap_binddn = Config::get('ldapauth', 'ldap_binddn');
$ldap_bindpw = Config::get('ldapauth', 'ldap_bindpw');
$ldap_searchdn = Config::get('ldapauth', 'ldap_searchdn');
$ldap_userattr = Config::get('ldapauth', 'ldap_userattr');
$ldap_group = Config::get('ldapauth', 'ldap_group');
$ldap_autocreateaccount = Config::get('ldapauth', 'ldap_autocreateaccount');
$ldap_autocreateaccount_emailattribute = Config::get('ldapauth', 'ldap_autocreateaccount_emailattribute');
$ldap_autocreateaccount_nameattribute = Config::get('ldapauth', 'ldap_autocreateaccount_nameattribute');
if (!((strlen($password)) && (function_exists('ldap_connect')) && (strlen($ldap_server)))) {
logger("ldapauth: not configured or missing php-ldap module");
return false;
}
$connect = @ldap_connect($ldap_server);
if ($connect === false) {
logger("ldapauth: could not connect to $ldap_server");
return false;
}
@ldap_set_option($connect, LDAP_OPT_PROTOCOL_VERSION, 3);
@ldap_set_option($connect, LDAP_OPT_REFERRALS, 0);
if ((@ldap_bind($connect, $ldap_binddn, $ldap_bindpw)) === false) {
logger("ldapauth: could not bind $ldap_server as $ldap_binddn");
return false;
}
$res = @ldap_search($connect, $ldap_searchdn, $ldap_userattr . '=' . $username);
if (!$res) {
logger("ldapauth: $ldap_userattr=$username,$ldap_searchdn not found");
return false;
}
$id = @ldap_first_entry($connect, $res);
if (!$id) {
return false;
}
$dn = @ldap_get_dn($connect, $id);
if (!@ldap_bind($connect, $dn, $password)) {
return false;
}
$emailarray = [];
$namearray = [];
if ($ldap_autocreateaccount == "true") {
if (!strlen($ldap_autocreateaccount_emailattribute)) {
$ldap_autocreateaccount_emailattribute = "mail";
}
if (!strlen($ldap_autocreateaccount_nameattribute)) {
$ldap_autocreateaccount_nameattribute = "givenName";
}
$emailarray = @ldap_get_values($connect, $id, $ldap_autocreateaccount_emailattribute);
$namearray = @ldap_get_values($connect, $id, $ldap_autocreateaccount_nameattribute);
}
if (!strlen($ldap_group)) {
ldap_autocreateaccount($ldap_autocreateaccount, $username, $password, $emailarray[0], $namearray[0]);
return true;
}
$r = @ldap_compare($connect, $ldap_group, 'member', $dn);
if ($r === -1) {
$err = @ldap_error($connect);
$eno = @ldap_errno($connect);
@ldap_close($connect);
if ($eno === 32) {
logger("ldapauth: access control group Does Not Exist");
return false;
} elseif ($eno === 16) {
logger('ldapauth: membership attribute does not exist in access control group');
return false;
} else {
logger('ldapauth: error: ' . $err);
return false;
}
} elseif ($r === false) {
@ldap_close($connect);
return false;
}
ldap_autocreateaccount($ldap_autocreateaccount, $username, $password, $emailarray[0], $namearray[0]);
return true;
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}
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function ldap_autocreateaccount($ldap_autocreateaccount, $username, $password, $email, $name)
{
if ($ldap_autocreateaccount == "true") {
$results = get_existing_account($username);
if (empty($results)) {
if (strlen($email) > 0 && strlen($name) > 0) {
$arr = array('username' => $name, 'nickname' => $username, 'email' => $email, 'password' => $password, 'verified' => 1);
$result = User::create($arr);
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if ($result['success']) {
logger("ldapauth: account " . $username . " created");
} else {
logger("ldapauth: account " . $username . " was not created ! : " . implode($result));
}
} else {
logger("ldapauth: unable to create account, no email or nickname found");
}
}
}
}
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function get_existing_account($username)
{
return q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `blocked` = 0 AND `verified` = 1 LIMIT 1", $username);
}