The macOS system must use multifactor authentication for local and network access to privileged and non-privileged accounts.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-95565	AOSX-14-003020	SV-104729r1_rule		Medium

Description
Without the use of multifactor authentication, the ease of access to privileged and non-privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. Factors include: 1) something a user knows (e.g., password/PIN); 2) something a user has (e.g., cryptographic identification device, token); and 3) something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the Internet). Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network. The DoD CAC with DoD-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055

Description

Without the use of multifactor authentication, the ease of access to privileged and non-privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. Factors include: 1) something a user knows (e.g., password/PIN); 2) something a user has (e.g., cryptographic identification device, token); and 3) something a user is (e.g., biometric). A privileged account is defined as an information system account with authorizations of a privileged user. Network access is defined as access to an information system by a user (or a process acting on behalf of a user) communicating through a network (e.g., local area network, wide area network, or the Internet). Local access is defined as access to an organizational information system by a user (or process acting on behalf of a user) communicating through a direct connection without the use of a network. The DoD CAC with DoD-approved PKI is an example of multifactor authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055

STIG	Date
Apple OS X 10.14 (Mojave) Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-94393r1_chk )
If the system is connected to a directory server, this is Not Applicable. To verify that the system is configured to enforce multi-factor authentication, run the following commands: /usr/sbin/system_profiler SPConfigurationProfileDataType \| /usr/bin/grep enforceSmartCard If the results do not show the following, this is a finding. "enforceSmartCard=1. Run the following command to disable password based authentication in SSHD. /usr/bin/grep -e ^[\#]PasswordAuthentication. -e ^[\#]ChallengeResponseAuthentication. /etc/ssh/sshd_config If this command returns null, or anything other than exactly this text, with no leading hash(#), this is a finding: "PasswordAuthentication no ChallengeResponseAuthentication no"

Check Text ( C-94393r1_chk )

If the system is connected to a directory server, this is Not Applicable.

To verify that the system is configured to enforce multi-factor authentication, run the following commands:

/usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep enforceSmartCard

If the results do not show the following, this is a finding.
"enforceSmartCard=1.

Run the following command to disable password based authentication in SSHD.

/usr/bin/grep -e ^[\#]*PasswordAuthentication.* -e ^[\#]*ChallengeResponseAuthentication.* /etc/ssh/sshd_config

If this command returns null, or anything other than exactly this text, with no leading hash(#), this is a finding:

"PasswordAuthentication no
ChallengeResponseAuthentication no"

Fix Text (F-101231r1_fix)
For non directory bound systems, this setting is enforced using the "Smart Card Policy" configuration profile. Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system. The following commands must be run to disable passcode based authentication for SSHD: /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]ChallengeResponseAuthentication./ChallengeResponseAuthentication no/' /etc/ssh/sshd_config /usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]PasswordAuthentication./PasswordAuthentication no/' /etc/ssh/sshd_config

Fix Text (F-101231r1_fix)

For non directory bound systems, this setting is enforced using the "Smart Card Policy" configuration profile.

Note: Before applying the "Smart Card Policy", the supplemental guidance provided with the STIG should be consulted to ensure continued access to the operating system.

The following commands must be run to disable passcode based authentication for SSHD:

/usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*ChallengeResponseAuthentication.*/ChallengeResponseAuthentication no/' /etc/ssh/sshd_config
/usr/bin/sudo /usr/bin/sed -i.bak 's/^[\#]*PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config