The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.
#!/bin/bash
# Reconstructed from oval:mil.disa.stig.ubuntu2404os:def:270669
# Ubuntu 24.04 LTS SSH server must be configured to use only FIPS 140-3 validated key exchange algorithms.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
( (sed -En 's/^\s*(?i)KexAlgorithms(?-i)\s+"?(\S+)"?\s*(?:#.*)?$/\1/p' '/etc/ssh/sshd_config') | grep -qxF 'ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group14-sha256' ) || ( (grep -rhP --include='*.conf' '^\s*(?i)KexAlgorithms(?-i)\s+"?(\S+)"?\s*(?:#.*)?$' '/etc/ssh/sshd_config.d' | sed -En 's/^\s*(?i)KexAlgorithms(?-i)\s+"?(\S+)"?\s*(?:#.*)?$/\1/p') | grep -qxF 'ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group14-sha256' )
}
if test_1; then
echo "PASS"
else
echo "FAIL"
fi Assessment Script Powered by AISandbox-executed
A standalone Shell script to assess this control automatically. Review before running it in your environment.
Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.
#!/bin/sh
# oval:mil.disa.stig.ubuntu2404os:def:270669
if [ ! -f "/etc/ssh/sshd_config" ]; then echo "PASS"; exit 0; fi
grep -q "^\\s*(?i)KexAlgorithms(?-i)\\s+\"?(ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group14-sha256)\"?\\s*$" /etc/ssh/sshd_config || echo "FAIL"; exit 0
echo "PASS"
exit 0