rsyslog hardening (fixing a few weird things we noticed)

awx/main/utils/external_logging.py

@@ -26,9 +26,11 @@ def construct_rsyslog_conf_template(settings=settings):
                     port = parsed.port
             except ValueError:
                 port = settings.LOG_AGGREGATOR_PORT
+        max_bytes = settings.MAX_EVENT_RES_DATA
         parts.extend([
             '$WorkDirectory /var/lib/awx/rsyslog',
             '$IncludeConfig /etc/rsyslog.d/*.conf',
+            f'$MaxMessageSize {max_bytes}b',
             '$ModLoad imuxsock',
             'input(type="imuxsock" Socket="' + settings.LOGGING['handlers']['external_logger']['address'] + '" unlink="on")',
             'template(name="awx" type="string" string="%msg%")',

awx/main/utils/formatters.py

@@ -97,7 +97,7 @@ class LogstashFormatterBase(logging.Formatter):
 
     @classmethod
     def serialize(cls, message):
-        return bytes(json.dumps(message, cls=DjangoJSONEncoder), 'utf-8')
+        return ' ' + json.dumps(message, cls=DjangoJSONEncoder) + '\000'
 
 
 class LogstashFormatter(LogstashFormatterBase):

awx/main/utils/handlers.py

@@ -11,6 +11,8 @@ from django.conf import settings
 
 class RSysLogHandler(logging.handlers.SysLogHandler):
 
+    append_nul = False
+
     def emit(self, msg):
         if not os.path.exists(settings.LOGGING['handlers']['external_logger']['address']):
             return