Allow null passphrase for MASTER logins

New config options for this in GLOBAL config section

If pashphrase is null and this option is set, login will always succeed

config.py

@@ -122,7 +122,9 @@ def build_config(_config_file):
                     'SUB_ACL': config.get(section, 'SUB_ACL'),
                     'TG1_ACL': config.get(section, 'TGID_TS1_ACL'),
                     'TG2_ACL': config.get(section, 'TGID_TS2_ACL'),
-                    'GEN_STAT_BRIDGES': config.getboolean(section, 'GEN_STAT_BRIDGES')
+                    'GEN_STAT_BRIDGES': config.getboolean(section, 'GEN_STAT_BRIDGES'),
+                    'ALLOW_NULL_PASSPHRASE': config.getboolean(section, 'ALLOW_NULL_PASSPHRASE')
+                    
                 })
 
             elif section == 'REPORTS':

hblink.py

@@ -465,17 +465,22 @@ class HBSYSTEM(DatagramProtocol):
                 self._peer_sema.release()
                 _sent_hash = _data[8:]
                 _salt_str = bytes_4(_this_peer['SALT'])
-                _calc_hash = bhex(sha256(_salt_str+self._config['PASSPHRASE']).hexdigest())
+                if self._CONFIG['GLOBAL']['ALLOW_NULL_PASSPHRASE'] and len(self._config['PASSPHRASE']) == 0:
-                if _sent_hash == _calc_hash:
                     _this_peer['CONNECTION'] = 'WAITING_CONFIG'
                     self.send_peer(_peer_id, b''.join([RPTACK, _peer_id]))
                     logger.info('(%s) Peer %s has completed the login exchange successfully', self._system, _this_peer['RADIO_ID'])
                 else:
-                    logger.info('(%s) Peer %s has FAILED the login exchange successfully', self._system, _this_peer['RADIO_ID'])
+                    _calc_hash = bhex(sha256(_salt_str+self._config['PASSPHRASE']).hexdigest())                
-                    self.transport.write(b''.join([MSTNAK, _peer_id]), _sockaddr)
+                    if _sent_hash == _calc_hash:
-                    self._peer_sema.acquire(blocking=True)
+                        _this_peer['CONNECTION'] = 'WAITING_CONFIG'
-                    del self._peers[_peer_id]
+                        self.send_peer(_peer_id, b''.join([RPTACK, _peer_id]))
-                    self._peer_sema.release()
+                        logger.info('(%s) Peer %s has completed the login exchange successfully', self._system, _this_peer['RADIO_ID'])
+                    else:
+                        logger.info('(%s) Peer %s has FAILED the login exchange successfully', self._system, _this_peer['RADIO_ID'])
+                        self.transport.write(b''.join([MSTNAK, _peer_id]), _sockaddr)
+                        self._peer_sema.acquire(blocking=True)
+                        del self._peers[_peer_id]
+                        self._peer_sema.release()
             else:
                 self.transport.write(b''.join([MSTNAK, _peer_id]), _sockaddr)
                 logger.warning('(%s) Login challenge from Radio ID that has not logged in: %s', self._system, int_id(_peer_id))