CCI-000068 in U Apple macOS 15 V1R1

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UNCLASSIFIED

Group Title

SRG-OS-000033-GPOS-00014

Group ID

V-268438

Rule Version

APPL-15-000054

Rule Title

The macOS system must limit SSHD to FIPS-compliant connections.

Rule ID

SV-268438r1034254_rule

Rule Severity

● High

Rule Weight

10.0

Vuln Discussion

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

Documentable

False

Check Content

Verify the macOS system is configured to limit SSHD to FIPS-compliant connections with the following command:

fips_sshd_config=("Ciphers [email protected]" "HostbasedAcceptedAlgorithms ecdsa-sha2-nistp256,[email protected]" "HostKeyAlgorithms [email protected],[email protected],ecdsa-sha2-nistp256,[email protected]" "KexAlgorithms ecdh-sha2-nistp256" "MACs [email protected],hmac-sha2-256" "PubkeyAcceptedAlgorithms ecdsa-sha2-nistp256,[email protected],[email protected]" "CASignatureAlgorithms ecdsa-sha2-nistp256,[email protected]")

total=0

for config in $fips_sshd_config; do

total=$(expr $(/usr/sbin/sshd -G | /usr/bin/grep -i -c "$config") + $total)

done

echo $total

If the result is not "7", this is a finding.

Check System

C-72468r1034252_chk

Fix Reference

F-72369r1034253_fix

Fix Text

Configure the macOS system to limit SSHD to FIPS-compliant connections with the following command:

/bin/ln -fs /etc/ssh/crypto/fips.conf /etc/ssh/crypto.conf

Identities

CCI-000068

Implement cryptographic mechanisms to protect the confidentiality of remote access sessions.

800-53 :: AC-17 (2)
800-53 Rev. 4 :: AC-17 (2)
800-53 Rev. 5 :: AC-17 (2)
800-53A :: AC-17 (2).1

CCI-000803

Implement mechanisms for authentication to a cryptographic module that meet the requirements of applicable laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

800-53 :: IA-7
800-53 Rev. 4 :: IA-7
800-53 Rev. 5 :: IA-7
800-53A :: IA-7.1

CCI-001453

Implement cryptographic mechanisms to protect the integrity of remote access sessions.

800-53 :: AC-17 (2)
800-53 Rev. 4 :: AC-17 (2)
800-53 Rev. 5 :: AC-17 (2)
800-53A :: AC-17 (2).1

CCI-002421

Implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission.

800-53 Rev. 4 :: SC-8 (1)
800-53 Rev. 5 :: SC-8 (1)

CCI-002450

Implement organization-defined types of cryptography for each specified cryptography use.

800-53 Rev. 4 :: SC-13
800-53 Rev. 5 :: SC-13 b

CCI-002890

Implement organization-defined cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications.

800-53 Rev. 4 :: MA-4 (6)
800-53 Rev. 5 :: MA-4 (6)

CCI-003123

Implement organization-defined cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications.

800-53 Rev. 4 :: MA-4 (6)
800-53 Rev. 5 :: MA-4 (6)

Group Title

SRG-OS-000033-GPOS-00014

Group ID

V-268439

Rule Version

APPL-15-000057

Rule Title

The macOS system must limit SSH to FIPS-compliant connections.

Rule ID

SV-268439r1034803_rule

Rule Severity

● High

Rule Weight

10.0

Vuln Discussion

SSH must be configured to limit the Ciphers, HostbasedAcceptedAlgorithms, HostKeyAlgorithms, KexAlgorithms, MACs, PubkeyAcceptedAlgorithms, CASignatureAlgorithms to algorithms that are FIPS-140 validated.

FIPS 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 SSH 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-000396-GPOS-00176, SRG-OS-000424-GPOS-00188, SRG-OS-000478-GPOS-00223

Documentable

False

Check Content

Verify the macOS system is configured to limit SSH to FIPS-compliant connections with the following command:

fips_ssh_config=("Ciphers [email protected]" "HostbasedAcceptedAlgorithms ecdsa-sha2-nistp256,[email protected]" "HostKeyAlgorithms [email protected],[email protected],ecdsa-sha2-nistp256,[email protected]" "KexAlgorithms ecdh-sha2-nistp256" "MACs [email protected],hmac-sha2-256" "PubkeyAcceptedAlgorithms ecdsa-sha2-nistp256,[email protected],[email protected]" "CASignatureAlgorithms ecdsa-sha2-nistp256,[email protected]")

total=0

ret="pass"

for config in $fips_ssh_config; do

if [[ "$ret" == "fail" ]]; then

break

for u in $(/usr/bin/dscl . list /users shell | /usr/bin/egrep -v '(^_)|(root)|(/usr/bin/false)' | /usr/bin/awk '{print $1}'); do

sshCheck=$(/usr/bin/sudo -u $u /usr/bin/ssh -G . | /usr/bin/grep -ci "$config")

if [[ "$sshCheck" == "0" ]]; then

ret="fail"

break

done

echo $ret

If the result is not "pass", this is a finding.

Check System

C-72469r1034801_chk

Fix Reference

F-72370r1034802_fix

Fix Text

Configure the macOS system to limit SSH 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/ssh_config.d/100-macos.conf 2>/dev/null; then

/bin/ln -fs /etc/ssh/crypto/fips.conf /etc/ssh/crypto.conf

include_dir=$(/usr/bin/awk '/^Include/ {print $2}' /etc/ssh/ssh_config | /usr/bin/tr -d '*')

for ssh_config in $fips_ssh_config; do

ssh_setting=$(echo $ssh_config | /usr/bin/cut -d " " -f1)

/usr/bin/grep -qEi "^$ssh_setting" "${include_dir}01-mscp-ssh.conf" && /usr/bin/sed -i "" "s/^$ssh_setting.*/${ssh_config}/" "${include_dir}01-mscp-ssh.conf" || echo "$ssh_config" >> "${include_dir}01-mscp-ssh.conf"

for u in $(/usr/bin/dscl . list /users shell | /usr/bin/egrep -v '(^_)|(root)|(/usr/bin/false)' | /usr/bin/awk '{print $1}'); do

config=$(/usr/bin/sudo -u $u /usr/bin/ssh -Gv . 2>&1)

configfiles=$(echo "$config" | /usr/bin/awk '/Reading configuration data/ {print $NF}'| /usr/bin/tr -d '\r')

configarray=( ${(f)configfiles} )

if ! echo $config | /usr/bin/grep -q -i "$ssh_config" ; then

for c in $configarray; do

if [[ "$c" == "/etc/ssh/crypto.conf" ]]; then

continue

/usr/bin/sudo -u $u /usr/bin/grep -qEi "^$ssh_setting" "$c" && /usr/bin/sed -i "" "s/^$ssh_setting.*/${ssh_config}/I" "$c"

if [[ "$c" =~ ".ssh/config" ]]; then

if /usr/bin/grep -qEi "$ssh_setting" "$c" 2> /dev/null; then

old_file=$(cat ~$u/.ssh/config)

echo "$ssh_config" > ~$u/.ssh/config

echo "$old_file" >> ~$u/.ssh/config

done

Identities

CCI-000068

Implement cryptographic mechanisms to protect the confidentiality of remote access sessions.

800-53 :: AC-17 (2)
800-53 Rev. 4 :: AC-17 (2)
800-53 Rev. 5 :: AC-17 (2)
800-53A :: AC-17 (2).1

CCI-000803

800-53 :: IA-7
800-53 Rev. 4 :: IA-7
800-53 Rev. 5 :: IA-7
800-53A :: IA-7.1

CCI-001453

Implement cryptographic mechanisms to protect the integrity of remote access sessions.

800-53 :: AC-17 (2)
800-53 Rev. 4 :: AC-17 (2)
800-53 Rev. 5 :: AC-17 (2)
800-53A :: AC-17 (2).1

CCI-002421

Implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission.

800-53 Rev. 4 :: SC-8 (1)
800-53 Rev. 5 :: SC-8 (1)

CCI-002450

Implement organization-defined types of cryptography for each specified cryptography use.

800-53 Rev. 4 :: SC-13
800-53 Rev. 5 :: SC-13 b

UNCLASSIFIED