The NFS server must have logging implemented.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4300	GEN000000-SOL00400	SV-40041r1_rule	ECAR-1 ECAR-2 ECAR-3	Medium

Description
Filesystem logging, especially for NFS exported file systems, can be critical to detecting data misuse and possible hardware/system errors that may, otherwise, go unnoticed.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-04-10

Details

Check Text ( C-39054r1_chk )
To enable NFS server logging the log option must be applied to all exported file systems in the /etc/dfs/dfstab. Perform the following to verify NFS is enabled. # share The preceding command will display all exported filesystems. Each line should contain a log entry to indicate logging is enabled. If the log entry is not present, this is a finding. If the share command does not return anything, then this is not an NFS server and this is considered not applicable. NFS version 4 does not support server logging. Verify NFS_SERVER_VERSMAX in /etc/default/nfs. # grep NFS_SERVER_VERSMAX /etc/default/nfs If NFS_SERVER_VERSMAX is commented out or set to any value but 2 or 3, this is a finding.

Check Text ( C-39054r1_chk )

To enable NFS server logging the log option must be applied to all exported file systems in the /etc/dfs/dfstab. Perform the following to verify NFS is enabled.

# share

The preceding command will display all exported filesystems. Each line should contain a log entry to indicate logging is enabled. If the log entry is not present, this is a finding. If the share command does not return anything, then this is not an NFS server and this is considered not applicable.

NFS version 4 does not support server logging. Verify NFS_SERVER_VERSMAX in /etc/default/nfs.

# grep NFS_SERVER_VERSMAX /etc/default/nfs

If NFS_SERVER_VERSMAX is commented out or set to any value but 2 or 3, this is a finding.

Fix Text (F-34153r1_fix)
Edit /etc/dfs/dfstab and add the log option to all exported filesystems. Run the shareall command for the changes to take effect. NFS version 2 or 3 must be forced by updating the NFS_SERVER_VERSMAX variable appropriately in /etc/default/nfs and restarting the NFS daemon.