BIND DNS
TMA-BIND-10.4
Ensure Only the Necessary SELinux Booleans are Enabled
Description
SELinux booleans allow or disallow specific behaviors. There are two boolean variables specific to the ISC BIND DNS server: ; named_tcp_bind_http_port - Allow named to tcp bind http port ; named_write_master_zones - Allow named to write master zones The named_tcp_bind_http_port would allow enabling the BIND statistics http channel which is not recommended. The audit runs getsebool named_tcp_bind_http_port and requires off (named_write_master_zones is not audited).
How it is checked
Audit method: Shell command
v=$(getsebool named_tcp_bind_http_port 2>/dev/null) || exit 1
case "$v" in *'--> off') echo compliant ;; *) echo "$v" ;; esac- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Perform the following to implement the recommended state: Disable the SELinux boolean using the setsebool command as shown below with the -P option to make the change persistent. # setsebool -P named_tcp_bind_http_port off
Properties
- Operating systems
- Any
- Tags
- binddnsselinux
- Reference
- CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0 - 10.4 Ensure Only the Necessary SELinux Booleans are Enabled
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target bind --level 2