Dell S4820T, Configuration Manual

Page: 378 / 1178

Enabling FIPS Mode
To enable or disable FIPS mode, use the console port.
Secure the host attached to the console port against unauthorized access. Any attempts to enable or
disable FIPS mode from a virtual terminal session are denied.
When you enable FIPS mode, the following actions are taken:
• If enabled, the SSH server is disabled.
• All open SSH and Telnet sessions, as well as all SCP and FTP file transfers, are closed.
• Any existing host keys (both RSA and RSA1) are deleted from system memory and NVRAM storage.
• FIPS mode is enabled.
– If you enable the SSH server when you enter the
fips mode enable
command, it is re-enabled
for version 2 only .
– If you re-enable the SSH server, a new RSA host key-pair is generated automatically. You can also
manually create this key-pair using the
crypto key generate
command.
NOTE: Under certain unusual circumstances, it is possible for the
fips enable
command to
indicate a failure.
• This failure occurs if any of the self-tests fail when you enable FIPS mode.
• This failure occurs if there were existing SSH/Telnet sessions that could not be closed
successfully in a reasonable amount of time. In general, this failure can occur if a user at a
remote host is in the process of establishing an SSH session to the local system, and has been
prompted to accept a new host key or to enter a password, but is not responding to the request.
Assuming this failure is a transient condition, attempting to enable FIPS mode again should be
successful.
To enable FIPS mode, use the following command.
• Enable FIPS mode from a console port.
CONFIGURATION
fips mode enable
The following warning message displays:
WARNING: Enabling FIPS mode will close all SSH/Telnet connections, restart
those servers, and destroy all configured host keys. Proceed (y/n) ?
Generating Host-Keys
The following describes hot-key generation.
When you enable or disable FIPS mode, the system deletes the current public/private host-key pair,
terminates any SSH sessions that are in progress (deleting all the per-session encryption key information),
actually enables/tests FIPS mode, generates new host-keys, and re-enables the SSH server (assuming it
was enabled before enabling FIPS).
378
FIPS Cryptography