TCP Wrappers must be enabled and configured per site policy to only allow access by approved hosts and services.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216318	SOL-11.1-030050	SV-216318r603267_rule		Medium

Description
TCP Wrappers are a host-based access control system that allows administrators to control who has access to various network services based on the IP address of the remote end of the connection. TCP Wrappers also provide logging information via syslog about both successful and unsuccessful connections.

STIG	Date
Solaris 11 SPARC Security Technical Implementation Guide	2021-11-23

Details

Check Text ( C-17554r371042_chk )
Check that TCP Wrappers are enabled and the host.deny and host.allow files exist. # inetadm -p \| grep tcp_wrappers If the output of this command is "tcp_wrappers=FALSE", this is a finding. # ls /etc/hosts.deny /etc/hosts.deny # ls /etc/hosts.allow /etc/hosts.allow If these files do not exist or do not contain the names of allowed or denied hosts, this is a finding.

Fix Text (F-17552r371043_fix)
The root role is required. To enable TCP Wrappers, run the following commands: 1. Create and customize your policy in /etc/hosts.allow: # echo "ALL: [net]/[mask], [net]/[mask], ..." > /etc/hosts.allow where each [net>/[mask> combination (for example, the Class C address block "192.168.1.0/255.255.255.0") can represent one network block in use by your organization that requires access to this system. 2. Create a default deny policy in /etc/hosts.deny: # echo "ALL: ALL" >/etc/hosts.deny 3. Enable TCP Wrappers for all services started by inetd: # inetadm -M tcp_wrappers=TRUE The versions of SunSSH (0.5.11) and sendmail that ship with Solaris 11 will automatically use TCP Wrappers to filter access if a hosts.allow or hosts.deny file exists. The use of OpenSSH access is controlled by the sshd_config file starting with Solaris 11.3. SunSSH is removed starting with Solaris 11.4.

Fix Text (F-17552r371043_fix)

The root role is required.

To enable TCP Wrappers, run the following commands:

1. Create and customize your policy in /etc/hosts.allow:
# echo "ALL: [net]/[mask], [net]/[mask], ..." > /etc/hosts.allow

where each [net>/[mask> combination (for example, the Class C address block "192.168.1.0/255.255.255.0") can represent one network block in use by your organization that requires access to this system.

2. Create a default deny policy in /etc/hosts.deny:

# echo "ALL: ALL" >/etc/hosts.deny

3. Enable TCP Wrappers for all services started by inetd:

# inetadm -M tcp_wrappers=TRUE

The versions of SunSSH (0.5.11) and sendmail that ship with Solaris 11 will automatically use TCP Wrappers to filter access if a hosts.allow or hosts.deny file exists.

The use of OpenSSH access is controlled by the sshd_config file starting with Solaris 11.3.

SunSSH is removed starting with Solaris 11.4.