diff --git a/synapse/config/server.py b/synapse/config/server.py
index 85aa49c02d..f3815e5add 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -23,6 +23,7 @@ from typing import Any, Dict, Iterable, List, Optional, Set
import attr
import yaml
+from netaddr import IPSet
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.http.endpoint import parse_and_validate_server_name
@@ -39,6 +40,34 @@ logger = logging.Logger(__name__)
# in the list.
DEFAULT_BIND_ADDRESSES = ["::", "0.0.0.0"]
+DEFAULT_IP_RANGE_BLACKLIST = [
+ # Localhost
+ "127.0.0.0/8",
+ # Private networks.
+ "10.0.0.0/8",
+ "172.16.0.0/12",
+ "192.168.0.0/16",
+ # Carrier grade NAT.
+ "100.64.0.0/10",
+ # Address registry.
+ "192.0.0.0/24",
+ # Link-local networks.
+ "169.254.0.0/16",
+ # Testing networks.
+ "198.18.0.0/15",
+ "192.0.2.0/24",
+ "198.51.100.0/24",
+ "203.0.113.0/24",
+ # Multicast.
+ "224.0.0.0/4",
+ # Localhost
+ "::1/128",
+ # Link-local addresses.
+ "fe80::/10",
+ # Unique local addresses.
+ "fc00::/7",
+]
+
DEFAULT_ROOM_VERSION = "6"
ROOM_COMPLEXITY_TOO_GREAT = (
@@ -256,6 +285,38 @@ class ServerConfig(Config):
# due to resource constraints
self.admin_contact = config.get("admin_contact", None)
+ ip_range_blacklist = config.get(
+ "ip_range_blacklist", DEFAULT_IP_RANGE_BLACKLIST
+ )
+
+ # Attempt to create an IPSet from the given ranges
+ try:
+ self.ip_range_blacklist = IPSet(ip_range_blacklist)
+ except Exception as e:
+ raise ConfigError("Invalid range(s) provided in ip_range_blacklist.") from e
+ # Always blacklist 0.0.0.0, ::
+ self.ip_range_blacklist.update(["0.0.0.0", "::"])
+
+ try:
+ self.ip_range_whitelist = IPSet(config.get("ip_range_whitelist", ()))
+ except Exception as e:
+ raise ConfigError("Invalid range(s) provided in ip_range_whitelist.") from e
+
+ # The federation_ip_range_blacklist is used for backwards-compatibility
+ # and only applies to federation and identity servers. If it is not given,
+ # default to ip_range_blacklist.
+ federation_ip_range_blacklist = config.get(
+ "federation_ip_range_blacklist", ip_range_blacklist
+ )
+ try:
+ self.federation_ip_range_blacklist = IPSet(federation_ip_range_blacklist)
+ except Exception as e:
+ raise ConfigError(
+ "Invalid range(s) provided in federation_ip_range_blacklist."
+ ) from e
+ # Always blacklist 0.0.0.0, ::
+ self.federation_ip_range_blacklist.update(["0.0.0.0", "::"])
+
if self.public_baseurl is not None:
if self.public_baseurl[-1] != "/":
self.public_baseurl += "/"
@@ -561,6 +622,10 @@ class ServerConfig(Config):
def generate_config_section(
self, server_name, data_dir_path, open_private_ports, listeners, **kwargs
):
+ ip_range_blacklist = "\n".join(
+ " # - '%s'" % ip for ip in DEFAULT_IP_RANGE_BLACKLIST
+ )
+
_, bind_port = parse_and_validate_server_name(server_name)
if bind_port is not None:
unsecure_port = bind_port - 400
@@ -752,6 +817,21 @@ class ServerConfig(Config):
#
#enable_search: false
+ # Prevent outgoing requests from being sent to the following blacklisted IP address
+ # CIDR ranges. If this option is not specified then it defaults to private IP
+ # address ranges (see the example below).
+ #
+ # The blacklist applies to the outbound requests for federation, identity servers,
+ # push servers, and for checking key validity for third-party invite events.
+ #
+ # (0.0.0.0 and :: are always blacklisted, whether or not they are explicitly
+ # listed here, since they correspond to unroutable addresses.)
+ #
+ # This option replaces federation_ip_range_blacklist in Synapse v1.25.0.
+ #
+ #ip_range_blacklist:
+%(ip_range_blacklist)s
+
# List of ports that Synapse should listen on, their purpose and their
# configuration.
#
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