From 4d67a36c0a07ef8e07b8760b0e883bd42c0177ec Mon Sep 17 00:00:00 2001
From: Watson Sato <wsato@redhat.com>
Date: Thu, 21 Jan 2021 11:04:05 +0100
Subject: [PATCH] Add variable selector and notes for R29
---
controls/anssi.yml | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/controls/anssi.yml b/controls/anssi.yml
index dec9d68c99..3303d70295 100644
--- a/controls/anssi.yml
+++ b/controls/anssi.yml
@@ -521,10 +521,22 @@ controls:
description: >-
Remote user sessions (shell access, graphical clients) must be closed
after a certain period of inactivity.
+ notes: >-
+ There is no specific capability to check remote user inactivity, but some shells allow the
+ session inactivity time out to be configured via TMOUT variable.
+ In OpenSSH < 8.2 the inactivity of the user is implied from the network inactivity.
+ The server is configured to disconnect sessions if no data has been received within the idle timeout,
+ regardless of liveness status (ClientAliveCountMax is 0 and ClientAliveInterval is > 0).
+ In OpenSSH >= 8.2 there is no way to disconnect sessions based on client liveness.
+ The semantics of "ClientAliveCountMax 0" has changed from "disconnect on first timeout" to
+ "don't disconnect network inactive sessions". The server either probes for the client liveness
+ or keeps inactive sessions connected.
+ automated: yes
rules:
- accounts_tmout
+ - var_accounts_tmout=10_min
- sshd_set_idle_timeout
- - sshd_idle_timeout_value=5_minutes
+ - sshd_idle_timeout_value=10_minutes
- sshd_set_keepalive
- id: R30