Configuring SSH - disallow host based authentication

HighLevel 1Manual reviewibm-i

Description

The recommendation is to edit the /QOpenSys/QIBM/UserData/SC1/OpenSSH/etc/sshd_config file to ensure that host- based authentication is disallowed. Using host-based authentication, any user on a trusted host can log into another host on which this feature is enabled. Since this feature depends only on system authentication and not on user authentication, it must be disabled.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

DSPF '/QOpenSys/QIBM/UserData/SC1/OpenSSH/etc/sshd_config' On the Control field, type HostbasedAuthentication and press F16 (shift F4) Control: HostbasedAuthentication___________________________________ The display should yield the following output: HostbasedAuthentication no

How it is fixed

Fix method: Guidance or infrastructure patch

EDTF '/QOpenSys/QIBM/UserData/SC1/OpenSSH/etc/sshd_config' file to ensure that host based authentication is disallowed: Replace: #HostbasedAuthentication no With: HostbasedAuthentication no Re-cycle the sshd daemon to pick up the configuration changes:

Properties

Operating systems: Any
Tags: ibm-issh
Reference: CIS IBM i V7R5M0 Benchmark v2.1.0 - 5.4.3 Configuring SSH - disallow host based authentication