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Checking What SSL and TLS Are In Use

September 15, 2023

Here’s another command to check what version of SSL and TLS is being used.

nmap --script ssl-enum-ciphers -p 443 server.domain.com

nmap --script ssl-enum-ciphers -p 443 server.domain.com

Result

PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers: 
|   TLSv1.2: 
|     ciphers:
...

PORT STATE SERVICE 443/tcp open https | ssl-enum-ciphers: | TLSv1.2: | ciphers: ...

In this example, only TLSv1.2 is in use. For security purposes, use TLSv1.2 or higher.

Filed Under: Linux Tagged With: check, nmap, ssl, tls, version

Check for new kernel

February 5, 2023

Checking for new kernel on multiple distros.

Redhat, Centos, Fedora, Rocky

rpm -qa kernel
yum list installed kernel

rpm -qa kernel yum list installed kernel

Arch Linux

pacman -Q | grep linux

pacman -Q | grep linux

Fedora

dnf list installed kernel

dnf list installed kernel

SUSE

rpm -qa | grep -i kernel
zypper search -i kernel

rpm -qa | grep -i kernel zypper search -i kernel

Debian, Ubuntu, Mint

dpkg --list | grep linux-image

dpkg --list | grep linux-image

Filed Under: Linux Tagged With: check, kernel

Checking Nameservers

January 15, 2023

Handy little script to see if nameserver is on an array.

#!/bin/bash
declare -a servers=("127.0.0.53" "127.0.0.52" "127.0.0.51")
client=$(cat /etc/resolv.conf | grep nameserver)
for i in "${servers[@]}"
do
  if [[ $client =~ $i ]]
  then 
    using_unbound="true"
    break
  else
    using_unbound="false"
  fi
done
echo $using_unbound "|" $client

#!/bin/bash declare -a servers=("127.0.0.53" "127.0.0.52" "127.0.0.51") client=$(cat /etc/resolv.conf | grep nameserver) for i in "${servers[@]}" do if [[ $client =~ $i ]] then using_unbound="true" break else using_unbound="false" fi done echo $using_unbound "|" $client

Filed Under: Linux Tagged With: check, nameservers

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