Nutanix OS must implement cryptography to protect the integrity and confidentiality of remote access and nonlocal maintenance and diagnostic sessions.

Without cryptographic integrity protections, information can be altered by unauthorized users without detection.

Remote access (e.g., RDP) is access to DoW nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-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.

Satisfies: SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174

Note: For AHV, this requirement is Not Applicable.

Verify AOS, Prism Central, and Files OS VMs are configured to have systemwide crypto policies using the following command.

$ sudo grep -i crypto_policy /etc/sysconfig/sshd
# CRYPTO_POLICY=

If "CRYPTO_POLICY" is uncommented, this is a finding.

Configure SSH.

1. For AOS, configure SSH, then restart the SSH for the changes to take effect.

$ sudo salt-call state.sls security/CVM/sshdCVM
$ sudo systemctl restart sshd

2. For Prism Central, configure SSH, then restart the SSH for the changes to take effect.

$ sudo salt-call state.sls security/PCVM/sshdPCVM
$ sudo systemctl restart sshd

3. For Files, configure SSH, then restart the SSH for the changes to take effect.

$ sudo salt-call state.sls security/AFS/sshdAFS
$ sudo systemctl restart sshd