The OL 9 operating system must implement cryptographic mechanisms to prevent unauthorized modification of all information at rest.

Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.

Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields).

Note: If there is a documented and approved reason for not having data at rest encryption, this requirement is Not Applicable.

Verify that OL 9 prevents unauthorized disclosure or modification of all information requiring at rest protection by using disk encryption.

Determine the partition layout for the system with the following command:

$ sudo fdisk -l (..) Disk /dev/vda: 15 GiB, 16106127360 bytes, 31457280 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: 83298450-B4E3-4B19-A9E4-7DF147A5FEFB

Device Start End Sectors Size Type /dev/vda1 2048 4095 2048 1M BIOS boot /dev/vda2 4096 2101247 2097152 1G Linux filesystem /dev/vda3 2101248 31455231 29353984 14G Linux filesystem (...)

Verify that the system partitions are all encrypted with the following command:

$ sudo more /etc/crypttab 

Every persistent disk partition present must have an entry in the file.

If any partitions other than the boot partition or pseudo file systems (such as /proc or /sys) are not listed, this is a finding.

Configure the OL 9 operating system to implement cryptographic mechanisms to prevent unauthorized modification of all information at rest.

To encrypt an entire partition, dedicate a partition for encryption in the partition layout.

Note: Encrypting a partition in an already-installed system is more difficult because it will need to be resized and existing partitions changed.