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The RHEL 8 operating system must implement DoD-approved encryption in the OpenSSL package.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230254 RHEL-08-010293 SV-230254r627750_rule Medium
Description
Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. 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 secret key used to generate the hash. RHEL 8 incorporates system-wide crypto policies by default. The employed algorithms can be viewed in the /etc/crypto-policies/back-ends/openssl.config file. Satisfies: SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000125-GPOS-00065
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-06-15

Details

Check Text ( C-32923r567508_chk )
Verify the OpenSSL library is configured to use only ciphers employing FIPS 140-2-approved algorithms:

Verify that system-wide crypto policies are in effect:

$ sudo grep -i opensslcnf.config /etc/pki/tls/openssl.cnf

.include /etc/crypto-policies/back-ends/opensslcnf.config

If the "opensslcnf.config" is not defined in the "/etc/pki/tls/openssl.cnf" file, this is a finding.

Verify which system-wide crypto policy is in use:

$ sudo update-crypto-policies --show

FIPS

If the system-wide crypto policy is set to anything other than "FIPS", this is a finding.
Fix Text (F-32898r567509_fix)
Configure the RHEL 8 OpenSSL library to use only ciphers employing FIPS 140-2-approved algorithms with the following command:

$ sudo fips-mode-setup --enable

A reboot is required for the changes to take effect.