LDAP: offer option to disable SSL certificate checks. Works around problems with self-signed certificates, for example. However, the best and right way to solve it is always to import the LDAP server cert to the owncloud server, so you it for testing only.

Like to hear wether it works, instead appending LDAPTLS_REQCERT=never to ldap.conf.

apps/user_ldap/lib/connection.php

@@ -42,6 +42,7 @@ class Connection {
 		'ldapAgentPassword' => null,
 		'ldapTLS' => null,
 		'ldapNoCase' => null,
+		'turnOffCertCheck' => null,
 		'ldapIgnoreNamingRules' => null,
 		'ldapUserDisplayName' => null,
 		'ldapUserFilter' => null,
@@ -164,6 +165,7 @@ class Connection {
 			$this->config['ldapBaseGroups']        = \OCP\Config::getAppValue($this->configID, 'ldap_base_groups', $this->config['ldapBase']);
 			$this->config['ldapTLS']               = \OCP\Config::getAppValue($this->configID, 'ldap_tls',0);
 			$this->config['ldapNoCase']            = \OCP\Config::getAppValue($this->configID, 'ldap_nocase', 0);
+			$this->config['turnOffCertCheck']      = \OCP\Config::getAppValue($this->configID, 'ldap_turn_off_cert_check', 0);
 			$this->config['ldapUserDisplayName']   = mb_strtolower(\OCP\Config::getAppValue($this->configID, 'ldap_display_name', 'uid'), 'UTF-8');
 			$this->config['ldapUserFilter']        = \OCP\Config::getAppValue($this->configID, 'ldap_userlist_filter','objectClass=person');
 			$this->config['ldapGroupFilter']       = \OCP\Config::getAppValue($this->configID, 'ldap_group_filter','(objectClass=posixGroup)');
@@ -292,6 +294,13 @@ class Connection {
 
 				return false;
 			}
+			if($this->config['turnOffCertCheck']) {
+				if(putenv('LDAPTLS_REQCERT=never')) {
+					\OCP\Util::writeLog('user_ldap', 'Turned off SSL certificate validation successfully.', \OCP\Util::WARN);
+				} else {
+					\OCP\Util::writeLog('user_ldap', 'Could not turn off SSL certificate validation.', \OCP\Util::WARN);
+				}
+			}
 			$this->ldapConnectionRes = ldap_connect($this->config['ldapHost'], $this->config['ldapPort']);
 			if(ldap_set_option($this->ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
 					if(ldap_set_option($this->ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {

apps/user_ldap/settings.php

@@ -20,7 +20,7 @@
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-$params = array('ldap_host', 'ldap_port', 'ldap_dn', 'ldap_agent_password', 'ldap_base', 'ldap_base_users', 'ldap_base_groups', 'ldap_userlist_filter', 'ldap_login_filter', 'ldap_group_filter', 'ldap_display_name', 'ldap_group_display_name', 'ldap_tls', 'ldap_nocase', 'ldap_quota_def', 'ldap_quota_attr', 'ldap_email_attr', 'ldap_group_member_assoc_attribute', 'ldap_cache_ttl');
+$params = array('ldap_host', 'ldap_port', 'ldap_dn', 'ldap_agent_password', 'ldap_base', 'ldap_base_users', 'ldap_base_groups', 'ldap_userlist_filter', 'ldap_login_filter', 'ldap_group_filter', 'ldap_display_name', 'ldap_group_display_name', 'ldap_tls', 'ldap_turn_off_cert_check', 'ldap_nocase', 'ldap_quota_def', 'ldap_quota_attr', 'ldap_email_attr', 'ldap_group_member_assoc_attribute', 'ldap_cache_ttl');
 
 OCP\Util::addscript('user_ldap', 'settings');
 
@@ -46,6 +46,9 @@ if ($_POST) {
 		elseif('ldap_nocase' == $param) {
 			OCP\Config::setAppValue('user_ldap', $param, 0);
 		}
+		elseif('ldap_turn_off_cert_check' == $param) {
+			OCP\Config::setAppValue('user_ldap', $param, 0);
+		}
 	}
 }
 

apps/user_ldap/templates/settings.php

@@ -20,6 +20,7 @@
 		<p><label for="ldap_group_member_assoc_attribute"><?php echo $l->t('Group-Member association');?></label><select id="ldap_group_member_assoc_attribute" name="ldap_group_member_assoc_attribute"><option value="uniqueMember"<?php if (isset($_['ldap_group_member_assoc_attribute']) && ($_['ldap_group_member_assoc_attribute'] == 'uniqueMember')) echo ' selected'; ?>>uniqueMember</option><option value="memberUid"<?php if (isset($_['ldap_group_member_assoc_attribute']) && ($_['ldap_group_member_assoc_attribute'] == 'memberUid')) echo ' selected'; ?>>memberUid</option><option value="member"<?php if (isset($_['ldap_group_member_assoc_attribute']) && ($_['ldap_group_member_assoc_attribute'] == 'member')) echo ' selected'; ?>>member (AD)</option></select></p>
 		<p><input type="checkbox" id="ldap_tls" name="ldap_tls" value="1"<?php if ($_['ldap_tls']) echo ' checked'; ?>><label for="ldap_tls"><?php echo $l->t('Use TLS');?></label></p>
 		<p><input type="checkbox" id="ldap_nocase" name="ldap_nocase" value="1"<?php if (isset($_['ldap_nocase']) && ($_['ldap_nocase'])) echo ' checked'; ?>><label for="ldap_nocase"><?php echo $l->t('Case insensitve LDAP server (Windows)');?></label></p>
+		<p><input type="checkbox" id="ldap_turn_off_cert_check" name="ldap_turn_off_cert_check" title="<?php echo $l->t('If connection only works with this option, import the LDAP server\'s SSL certificate in your ownCloud server.');?>" value="1"<?php if ($_['ldap_turn_off_cert_check']) echo ' checked'; ?>><label for="ldap_turn_off_cert_check"><?php echo $l->t('Turn off SSL certificate validation.');?></label> <small><?php echo $l->t('Not recommended, use for testing only.');?></small></p>
 		<p><label for="ldap_display_name"><?php echo $l->t('Display Name Field');?></label><input type="text" id="ldap_display_name" name="ldap_display_name" value="<?php echo $_['ldap_display_name']; ?>" />
 		<small><?php echo $l->t('Currently the display name field needs to be the same you matched %%uid against in the filter above, because ownCloud doesn\'t distinguish between user id and user name.');?></small></p>
 		<p><label for="ldap_group_display_name"><?php echo $l->t('Group Display Name Field');?></label><input type="text" id="ldap_group_display_name" name="ldap_group_display_name" value="<?php echo $_['ldap_group_display_name']; ?>" /></p>