macOS 15 - Sequoia
The macOS system must limit SSHD to FIPS-compliant connections
Description
If SSHD is enabled, it must be configured to limit the Ciphers, HostbasedAcceptedAlgorithms, HostKeyAlgorithms, KexAlgorithms, MACs, PubkeyAcceptedAlgorithms, CASignatureAlgorithms to algorithms that are FIPS-140 validated.FIPS 140-2/140-3 is the current standard for validating that mechanisms used to access cryptographic modules use authentication that meets federal requirements.Operating systems using encryption must use FIPS-validated mechanisms for authenticating to cryptographic modules.Note: For more information on FIPS compliance with the version of SSHD included in the macOS, the manual page apple_ssh_and_fips has additional information.Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000396-GPOS-00176, SRG-OS-000424-GPOS-00188, SRG-OS-000478-GPOS-00223
Check
Verify the macOS system is configured to limit SSHD to FIPS-compliant connections with the following command:fips_sshd_config=("Ciphers aes128-gcm@openssh.com" "HostbasedAcceptedAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com" "HostKeyAlgorithms ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp256,sk-ecdsa-sha2-nistp256@openssh.com" "KexAlgorithms ecdh-sha2-nistp256" "MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-256" "PubkeyAcceptedAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" "CASignatureAlgorithms ecdsa-sha2-nistp256,sk-ecdsa-sha2-nistp256@openssh.com")total=0for config in $fips_sshd_config; dototal=$(expr $(/usr/sbin/sshd -G | /usr/bin/grep -i -c "$config") + $total)doneecho $totalIf the result is not "7", this is a finding.
Fix
Configure the macOS system to limit SSHD to FIPS-compliant connections with the following command:if [ -f /etc/ssh/crypto.conf ] && /usr/bin/grep -q "Include /etc/ssh/crypto.conf" /etc/ssh/sshd_config.d/100-macos.conf 2>/bin/null; then/bin/ln -fs /etc/ssh/crypto/fips.conf /etc/ssh/crypto.conffiinclude_dir=$(/usr/bin/awk '/^Include/ {print $2}' /etc/ssh/sshd_config | /usr/bin/tr -d '*')if [[ -z $include_dir ]]; then/usr/bin/sed -i.bk "1s/.*/Include \/etc\/ssh\/sshd_config.d\/\*/" /etc/ssh/sshd_configfifips_sshd_config=("Ciphers aes128-gcm@openssh.com" "HostbasedAcceptedAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com" "HostKeyAlgorithms ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp256,sk-ecdsa-sha2-nistp256@openssh.com" "KexAlgorithms ecdh-sha2-nistp256" "MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-256" "PubkeyAcceptedAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com" "CASignatureAlgorithms ecdsa-sha2-nistp256,sk-ecdsa-sha2-nistp256@openssh.com")sshd_config=$(/usr/sbin/sshd -G)for config in $fips_sshd_config; doif ! echo $sshd_config | /usr/bin/grep -q -i "$config" 2>/dev/null; then/usr/bin/grep -qxF "$config" "${include_dir}01-mscp-sshd.conf" 2>/dev/null || echo "$config" >> "${include_dir}01-mscp-sshd.conf"fidonefor file in $(ls ${include_dir}); doif [[ "$file" == "100-macos.conf" ]]; thencontinuefiif [[ "$file" == "01-mscp-sshd.conf" ]]; thenbreakfi/bin/mv ${include_dir}${file} ${include_dir}20-${file}done