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-rw-r--r--synapse/config/_base.py14
1 files changed, 14 insertions, 0 deletions
diff --git a/synapse/config/_base.py b/synapse/config/_base.py
index 8654b0f4a1..965478d8d5 100644
--- a/synapse/config/_base.py
+++ b/synapse/config/_base.py
@@ -150,6 +150,7 @@ class Config(object):
         server_name,
         generate_secrets=False,
         report_stats=None,
+        open_private_ports=False,
     ):
         """Build a default configuration file
 
@@ -173,6 +174,9 @@ class Config(object):
             report_stats (bool|None): Initial setting for the report_stats setting.
                 If None, report_stats will be left unset.
 
+            open_private_ports (bool): True to leave private ports (such as the non-TLS
+                HTTP listener) open to the internet.
+
         Returns:
             str: the yaml config file
         """
@@ -185,6 +189,7 @@ class Config(object):
                 server_name=server_name,
                 generate_secrets=generate_secrets,
                 report_stats=report_stats,
+                open_private_ports=open_private_ports,
             )
         )
 
@@ -298,6 +303,14 @@ class Config(object):
                 " stored. Defaults to the current working directory."
             ),
         )
+        generate_group.add_argument(
+            "--open-private-ports",
+            action="store_true",
+            help=(
+                "Leave private ports (such as the non-TLS HTTP listener) open to the"
+                " internet. Do not use this unless you know what you are doing."
+            ),
+        )
 
         config_args, remaining_args = config_parser.parse_known_args(argv)
 
@@ -351,6 +364,7 @@ class Config(object):
                     server_name=server_name,
                     report_stats=(config_args.report_stats == "yes"),
                     generate_secrets=True,
+                    open_private_ports=config_args.open_private_ports,
                 )
 
                 if not cls.path_exists(config_dir_path):