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