OL 9 IP tunnels must use 140-3 approved cryptographic algorithms.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-271743	SRG-OS-000033-GPOS-00014	OL09-00-002404	SV-271743r1092635_rule	2025-05-08	1

Description
Overriding the system crypto policy makes the behavior of the Libreswan service violate expectations and makes system configuration more fragmented.

ℹ️ Check
Note: If the IPsec service is not installed, this requirement is Not Applicable. Verify that the IPsec service uses the systemwide cryptographic policy with the following command: $ grep include /etc/ipsec.conf /etc/ipsec.d/*.conf /etc/ipsec.conf:include /etc/crypto-policies/back-ends/libreswan.config If the IPsec configuration file does not contain "include /etc/crypto-policies/back-ends/libreswan.config", this is a finding.

ℹ️ Check

Note: If the IPsec service is not installed, this requirement is Not Applicable. Verify that the IPsec service uses the systemwide cryptographic policy with the following command: $ grep include /etc/ipsec.conf /etc/ipsec.d/*.conf /etc/ipsec.conf:include /etc/crypto-policies/back-ends/libreswan.config If the IPsec configuration file does not contain "include /etc/crypto-policies/back-ends/libreswan.config", this is a finding.

✔️ Fix
Configure IPsec to use the systemwide cryptographic policy. Add the following line to "/etc/ipsec.conf": include /etc/crypto-policies/back-ends/libreswan.config