Ensure sshd GSSAPIAuthentication is disabled

How it is checked

Audit method: Shell command

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v sshd >/dev/null 2>&1 || { echo "step1: sshd not installed"; return 1; }; o=$(bash -c 'sshd -T | grep gssapiauthentication' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'gssapiauthentication no' || { echo step1: missing 'gssapiauthentication no'; return 1; }; }; if alt0; then echo compliant; fi

Expected output

compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Edit the /etc/ssh/sshd_config file to set the GSSAPIAuthentication parameter to no above any Include and Match entries as follows: GSSAPIAuthentication no Note: First occurrence of an option takes precedence, Match set statements withstanding. If Include locations are enabled, used, and order of precedence is understood in your environment, the entry may be created in a file in Include location.

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

tmaegis scan --target linux