Added fix for python2 regex

Fix for python2 attributeError instead of TypeError on login with wrong openLDAP setting
Added default empty string on LDAPCertificate
Fix ldap as scheme for tls connection
Enabled add user on LDAP Authentication
LDAP config port is now number input
Added header for user import config
Added python ldap version to about section
Fix: It's no longer possible to login via fallback password as long as LDAP server is available
Fix: TypeError on bind is now catched and transformed to error message
Update Readme
Fixes for ldap

cps/services/simpleldap.py

@@ -23,6 +23,10 @@ from flask_simpleldap import LDAP, LDAPException
 
 from .. import constants, logger
 
+try:
+    from ldap.pkginfo import __version__ as ldapVersion
+except ImportError:
+    pass
 
 log = logger.create()
 _ldap = LDAP()
@@ -34,14 +38,16 @@ def init_app(app, config):
 
     app.config['LDAP_HOST'] = config.config_ldap_provider_url
     app.config['LDAP_PORT'] = config.config_ldap_port
-    if config.config_ldap_encryption:
+    if config.config_ldap_encryption == 2:
         app.config['LDAP_SCHEMA'] = 'ldaps'
     else:
         app.config['LDAP_SCHEMA'] = 'ldap'
     # app.config['LDAP_SCHEMA'] = config.config_ldap_schema
     app.config['LDAP_USERNAME'] = config.config_ldap_serv_username
+    if config.config_ldap_serv_password is None:
+        config.config_ldap_serv_password = ''
     app.config['LDAP_PASSWORD'] = base64.b64decode(config.config_ldap_serv_password)
-    if config.config_ldap_cert_path:
+    if bool(config.config_ldap_cert_path):
         app.config['LDAP_REQUIRE_CERT'] = True
         app.config['LDAP_CERT_PATH'] = config.config_ldap_cert_path
     app.config['LDAP_BASE_DN'] = config.config_ldap_dn
@@ -52,6 +58,7 @@ def init_app(app, config):
     app.config['LDAP_OPENLDAP'] = bool(config.config_ldap_openldap)
     app.config['LDAP_GROUP_OBJECT_FILTER'] = config.config_ldap_group_object_filter
     app.config['LDAP_GROUP_MEMBERS_FIELD'] = config.config_ldap_group_members_field
+    # app.config['LDAP_CUSTOM_OPTIONS'] = {'OPT_NETWORK_TIMEOUT': 10}
 
     _ldap.init_app(app)
 
@@ -78,16 +85,22 @@ def bind_user(username, password):
     :returns: True if login succeeded, False if login failed, None if server unavailable.
     '''
     try:
-        result = _ldap.bind_user(username, password)
-        log.debug("LDAP login '%s': %r", username, result)
-        return result is not None
+        if _ldap.get_object_details(username):
+            result = _ldap.bind_user(username, password)
+            log.debug("LDAP login '%s': %r", username, result)
+            return result is not None, None
+        return None, None       # User not found
+    except (TypeError, AttributeError) as ex:
+        error = ("LDAP bind_user: %s" % ex)
+        return None, error
     except LDAPException as ex:
         if ex.message == 'Invalid credentials':
-            log.info("LDAP login '%s' failed: %s", username, ex)
-            return False
+            error = ("LDAP admin login failed")
+            return None, error
         if ex.message == "Can't contact LDAP server":
-            log.warning('LDAP Server down: %s', ex)
-            return None
+            # log.warning('LDAP Server down: %s', ex)
+            error = ('LDAP Server down: %s' % ex)
+            return None,  error
         else:
-            log.warning('LDAP Server error: %s', ex.message)
-            return None
+            error = ('LDAP Server error: %s' % ex.message)
+            return None, error