Adding upstream version 5.7.1.upstream/5.7.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/modules/rebinding/README.rst b/modules/rebinding/README.rst
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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _mod-rebinding:
+
+Rebinding protection
+====================
+
+This module provides protection from `DNS Rebinding attack`_ by blocking
+answers which contain IPv4_ or IPv6_ addresses for private use
+(or some other special-use addresses).
+
+To enable this module insert following line into your configuration file:
+
+.. code-block:: lua
+
+  modules.load('rebinding < iterate')
+
+Please note that this module does not offer stable configuration interface
+yet. For this reason it is suitable mainly for public resolver operators
+who do not need to whitelist certain subnets.
+
+.. warning:: DNS Blacklists (`RFC 5782`_) often use `127.0.0.0/8` to blacklist
+   a domain. Using the rebinding module prevents DNSBL from functioning
+   properly.
+
+.. _`DNS Rebinding attack`: https://en.wikipedia.org/wiki/DNS_rebinding
+.. _IPv4: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
+.. _IPv6: https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
+.. _`RFC 5782`: https://tools.ietf.org/html/rfc5782#section-2.1