openssh CIS compliance
* CIS 5.2.1 Ensure permissions on /etc/ssh/sshd_config are configured (Scored)
* CIS 5.2.2 Ensure SSH Protocol is set to 2 (Scored)
* CIS 5.2.3 Ensure SSH LogLevel is set to INFO (Scored)
* CIS 5.2.4 Ensure SSH X11 forwarding is disabled (Scored)
* CIS 5.2.5 Ensure SSH MaxAuthTries is set to 4 or less (Scored)
* CIS 5.2.6 Ensure SSH IgnoreRhosts is enabled (Scored)
* CIS 5.2.7 Ensure SSH HostbasedAuthentication is disabled (Scored)
* CIS 5.2.8 Ensure SSH root login is disabled (Scored)
* CIS 5.2.9 Ensure SSH PermitEmptyPasswords is disabled (Scored)
* CIS 5.2.10 Ensure SSH PermitUserEnvironment is disabled (Scored)
* CIS 5.2.11 Ensure only approved MAC algorithms are used (Scored)
* CIS 5.2.12 Ensure SSH Idle Timeout Interval is configured (Scored)
* CIS 5.2.13 Ensure SSH LoginGraceTime is set to one minute or less (Scored)
* CIS 5.2.14 Ensure SSH access is limited (Scored)
* CIS 5.2.15 Ensure SSH warning banner is configured (Scored)
Change-Id: Ie53dbdfada27bdb08d3571be10e0de95117a1a17
diff --git a/metadata/service/server/cis/cis-5-2-4.yml b/metadata/service/server/cis/cis-5-2-4.yml
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+# 5.2.4 Ensure SSH X11 forwarding is disabled (Scored)
+#
+# Profile Applicability
+# ---------------------
+# - Level 1 - Server
+# - Level 1 - Workstation
+#
+# Description
+# -----------
+# The X11Forwarding parameter provides the ability to tunnel X11 traffic through the
+# connection to enable remote graphic connections.
+#
+# Rationale
+# ---------
+# Disable X11 forwarding unless there is an operational requirement to use X11 applications
+# directly. There is a small risk that the remote X11 servers of users who are logged in via
+# SSH with X11 forwarding could be compromised by other users on the X11 server. Note
+# that even if X11 forwarding is disabled, users can always install their own forwarders.
+#
+# Audit
+# -----
+# Run the following command and verify that output matches:
+#
+# # grep "^X11Forwarding" /etc/ssh/sshd_config
+# X11Forwarding no
+#
+# Remediation
+# -----------
+# Edit the /etc/ssh/sshd_config file to set the parameter as follows:
+#
+# X11Forwarding no
+
+parameters:
+ openssh:
+ server:
+ x11:
+ forwarding: False
+