V-281016

Discussion

Centralized cryptographic policies simplify applying secure ciphers across an operating system and the applications that run on that operating system. Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. Satisfies: SRG-OS-000396-GPOS-00176, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174

Check Content

Verify RHEL 10 cryptographic policies are not overridden.

Verify the configured policy matches the generated policy with the following command:

$ sudo update-crypto-policies --check
The configured policy matches the generated policy

If the returned message does not match the above, but instead matches the following, this is a finding:

The configured policy does NOT match the generated policy

List all of the crypto backends configured on the system with the following command:

$ ls -l /etc/crypto-policies/back-ends/ 
lrwxrwxrwx. 1 root root  40 Nov 13 16:29 bind.config -> /usr/share/crypto-policies/FIPS/bind.txt
lrwxrwxrwx. 1 root root  42 Nov 13 16:29 gnutls.config -> /usr/share/crypto-policies/FIPS/gnutls.txt
lrwxrwxrwx. 1 root root  40 Nov 13 16:29 java.config -> /usr/share/crypto-policies/FIPS/java.txt
lrwxrwxrwx. 1 root root  46 Nov 13 16:29 javasystem.config -> /usr/share/crypto-policies/FIPS/javasystem.txt
lrwxrwxrwx. 1 root root  40 Nov 13 16:29 krb5.config -> /usr/share/crypto-policies/FIPS/krb5.txt
lrwxrwxrwx. 1 root root  45 Nov 13 16:29 libreswan.config -> /usr/share/crypto-policies/FIPS/libreswan.txt
lrwxrwxrwx. 1 root root  42 Nov 13 16:29 libssh.config -> /usr/share/crypto-policies/FIPS/libssh.txt
-rw-r--r--. 1 root root 398 Nov 13 16:29 nss.config
lrwxrwxrwx. 1 root root  43 Nov 13 16:29 openssh.config -> /usr/share/crypto-policies/FIPS/openssh.txt
lrwxrwxrwx. 1 root root  49 Nov 13 16:29 opensshserver.config -> /usr/share/crypto-policies/FIPS/opensshserver.txt
lrwxrwxrwx. 1 root root  46 Nov 13 16:29 opensslcnf.config -> /usr/share/crypto-policies/FIPS/opensslcnf.txt
lrwxrwxrwx. 1 root root  43 Nov 13 16:29 openssl.config -> /usr/share/crypto-policies/FIPS/openssl.txt
lrwxrwxrwx. 1 root root  48 Nov 13 16:29 openssl_fips.config -> /usr/share/crypto-policies/FIPS/openssl_fips.txt

If the paths do not point to the respective files under "/usr/share/crypto-policies/FIPS" path, this is a finding.

Note: nss.config should not be symlinked.

Note: If there is an operational need to use a subpolicy that causes the links to the crypto backends to break, this is a finding, and exceptions must be made by the authorizing official and documented with the information system security officer.