Adding upstream version 5.6.0.upstream/5.6.0upstream

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

1 files changed, 23 insertions, 0 deletions

diff --git a/modules/detect_time_skew/README.rst b/modules/detect_time_skew/README.rst
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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _mod-detect_time_skew:
+
+System time skew detector
+=========================
+
+This module compares local system time with inception and expiration time
+bounds in DNSSEC signatures for ``. NS`` records. If the local system time is
+outside of these bounds, it is likely a misconfiguration which will cause
+all DNSSEC validation (and resolution) to fail.
+
+In case of mismatch, a warning message will be logged to help with
+further diagnostics.
+
+.. warning:: Information printed by this module can be forged by a network attacker!
+  System administrator MUST verify values printed by this module and
+  fix local system time using a trusted source.
+
+This module is useful for debugging purposes. It runs only once during resolver
+start does not anything after that. It is enabled by default.
+You may disable the module by appending
+``modules.unload('detect_time_skew')`` to your configuration.