The SSH daemon must be configured to use a FIPS 140-3-compliant cryptographic algorithm.

Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked.

Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000250-GPOS-00093

Locate the SSH daemon configuration file found in /etc/ssh/ directory.

Alternately: From the UNIX System Services ISPF Shell, navigate to ribbon select tools. Select option 1 - Work with Processes.

If SSH Daemon is not active, this is not a finding.

Examine the SSH daemon configuration file: sshd_config

If there are no Ciphers lines, or the ciphers list contains any cipher not starting with "aes", this is a finding.

If the MACs line is not configured to "hmac-sha1" or greater, this is a finding.

Examine the z/OS-specific sshd server systemwide configuration: zos_sshd_config

If any of the following is untrue, this is a finding:

FIPSMODE=YES CiphersSource=ICSF MACsSource=ICSF

Edit the SSH daemon configuration and remove any ciphers not starting with "aes". If necessary, add a "Ciphers" line using FIPS 140-3-compliant algorithms.

Configure for message authentication to MACs "hmac-sha1" or greater.

Edit the z/OS-specific sshd server systemwide configuration file configuration as follows: FIPSMODE=YES CiphersSource=ICSF MACsSource=ICSF