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auth_pam_sudo_smartcard_enforce Enforce Multifactor Authentication for Privilege Escalation Through the sudo Command

NIST macOS Security Compliance Project Sequoia Guidance, Revision 4.0 (be5491f)
All changes in this version
first version loaded Authentication

Title

Enforce Multifactor Authentication for Privilege Escalation Through the sudo Command

Control

/usr/bin/grep -Ec '^(auth\s+sufficient\s+pam_smartcard.so|auth\s+required\s+pam_deny.so)' /etc/pam.d/sudo

Discussion

The system _MUST_ be configured to enforce multifactor authentication when the sudo command is used to elevate privilege.

All users _MUST_ go through multifactor authentication to prevent unauthenticated access and potential compromise to the system.

IMPORTANT: Modification of Pluggable Authentication Modules (PAM) now require user authorization, or use of a Privacy Preferences Policy Control (PPPC) profile from MDM that authorizes modifying system administrator files or full disk access.

NOTE: /etc/pam.d/sudo will be automatically modified to its original state following any update or major upgrade to the operating system.

Related controls

ia-2.1, ia-2.2, ia-2.8

Fix

[source,bash]
----

/bin/cat > /etc/pam.d/sudo << SUDO_END
# sudo: auth account password session
auth sufficient pam_smartcard.so
auth required pam_opendirectory.so
auth required pam_deny.so
account required pam_permit.so
password required pam_deny.so
session required pam_permit.so
SUDO_END

/bin/chmod 444 /etc/pam.d/sudo
/usr/sbin/chown root:wheel /etc/pam.d/sudo
----