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-rw-r--r--addon/ldapauth/ldapauth.php124
1 files changed, 124 insertions, 0 deletions
diff --git a/addon/ldapauth/ldapauth.php b/addon/ldapauth/ldapauth.php
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+++ b/addon/ldapauth/ldapauth.php
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+<?php
+
+/**
+ * Friendika addon
+ *
+ * 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.
+ *
+ * The person must have registered with Friendika using the normal registration
+ * procedures in order to have a Friendika user record, contact, and profile.
+ *
+ * Note when using with Windows Active Directory: you may need to set TLS_CACERT in your site
+ * ldap.conf file to the signing cert for your LDAP server.
+ *
+ * The required configuration options for this module may be set in the .htconfig.php file
+ * e.g.:
+ *
+ * $a->config['ldapauth']['ldap_server'] = 'host.example.com';
+ * ...etc.
+ *
+ */
+
+
+
+function ldapauth_install() {
+ register_hook('authenticate', 'addon/ldapauth/ldapauth.php', 'ldapauth_hook_authenticate');
+}
+
+
+function ldapauth_uninstall() {
+ unregister_hook('authenticate', 'addon/ldapauth/ldapauth.php', 'ldapauth_hook_authenticate');
+}
+
+
+function ldapauth_hook_authenticate($a,&$b) {
+ if(ldapauth_authenticate($b['username'],$b['password'])) {
+ $results = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `blocked` = 0 AND `verified` = 1 LIMIT 1",
+ dbesc($b['username'])
+ );
+ if(count($results)) {
+ $b['user_record'] = $results[0];
+ $b['authenticated'] = 1;
+ }
+ }
+ return;
+}
+
+
+function ldapauth_authenticate($username,$password) {
+
+ $ldap_server = get_config('ldapauth','ldap_server');
+ $ldap_binddn = get_config('ldapauth','ldap_binddn');
+ $ldap_bindpw = get_config('ldapauth','ldap_bindpw');
+ $ldap_searchdn = get_config('ldapauth','ldap_searchdn');
+ $ldap_userattr = get_config('ldapauth','ldap_userattr');
+ $ldap_group = get_config('ldapauth','ldap_group');
+
+ if(! ((strlen($password))
+ && (function_exists('ldap_connect'))
+ && (strlen($ldap_server))))
+ return false;
+
+ $connect = @ldap_connect($ldap_server);
+
+ if(! $connect)
+ return false;
+
+ @ldap_set_option($connect, LDAP_OPT_PROTOCOL_VERSION,3);
+ @ldap_set_option($connect, LDAP_OPT_REFERRALS, 0);
+ if((@ldap_bind($connect,$ldap_binddn,$ldap_bindpw)) === false) {
+ return false;
+ }
+
+ $res = @ldap_search($connect,$ldap_searchdn, $ldap_userattr . '=' . $username);
+
+ if(! $res) {
+ 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;
+
+ if(! strlen($ldap_group))
+ 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;
+ }
+
+ return true;
+}