{"description": "Limit the MACs to those hash algorithms which are FIPS-approved.\nThe following line in <tt>/etc/ssh/ssh_config</tt>\ndemonstrates use of FIPS-approved MACs:\n\n<pre>MACs </pre>\nIf this line does not contain these MACs in exact order,\nis commented out, or is missing, this is a finding.", "rationale": "DoD Information Systems are required to use FIPS-approved cryptographic hash\nfunctions. The only hash algorithms meeting this requirement is SHA2.", "severity": "medium", "references": {}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "MACs option is commented out or not using FIPS-approved hash algorithms", "ocil": "Only FIPS-approved MACs should be used. To verify that only FIPS-approved\nMACs are in use, run the following command:\n<pre>$ sudo grep -ir macs /etc/ssh/ssh_config*</pre>\nThe output should contain only following MACs:\n<pre>MACs <sub idref=\"ssh_approved_macs\" /></pre>", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [{"general": "The system needs to be rebooted for these changes to take effect."}], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": [], "cpe_platform_names": [], "inherited_cpe_platform_names": [], "bash_conditional": null, "fixes": {}, "title": "Use Only FIPS 140-3 Validated MACs", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/services/ssh/ssh_client/ssh_use_approved_macs_ordered_stig/rule.yml", "template": null}