The Red Hat Enterprise Linux operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Part of SRG-OS-000250-GPOS-00093

Associated with: CCI-001453

SV-86855r3_rule The Red Hat Enterprise Linux operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.

Vulnerability discussion

Without cryptographic integrity protections, information can be altered by unauthorized users without detection.Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.

Check content

If LDAP is not being utilized, this requirement is Not Applicable. Verify the operating system implements cryptography to protect the integrity of remote LDAP access sessions. To determine if LDAP is being used for authentication, use the following command: # systemctl status sssd.service sssd.service - System Security Services Daemon Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2018-06-27 10:58:11 EST; 1h 50min ago If the "sssd.service" is "active", then LDAP is being used. Check that the path to the X.509 certificate for peer authentication with the following command: # grep -i tls_cacert /etc/sssd/sssd.conf ldap_tls_cacert = /etc/pki/tls/certs/ca-bundle.crt Verify the "ldap_tls_cacert" option points to a file that contains the trusted CA certificate. If this file does not exist, or the option is commented out or missing, this is a finding.

Fix text

Configure the operating system to implement cryptography to protect the integrity of LDAP remote access sessions. Add or modify the following line in "/etc/sssd/sssd.conf": ldap_tls_cacert = /etc/pki/tls/certs/ca-bundle.crt

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