Validate Entries Using BASH Shell Scripting and Convert Case
Scripting Example in comments. Learn to validate entries supplied to a BASH shell script file that can be used to make entries in your SSHD_CONFIG. You will want to use mixed -case entries on the config and will need to convert the case to lowercase to compare against the output of sshd -T
#!/bin/bash
valid_keys=($(sudo sshd -T | awk '{print $1}' | sort -u))
key=$1
key_matched=false
for valid_key in "${valid_keys[@]}"; do
if [ "${key,,}" == $valid_key ]; then
key_matched=true
break
fi
done
if [ $key_matched == true ] ; then
echo "$key is valid"
else
echo "$key is invalid"
fi
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00:00 Introduction
01:48 Validate SSHD Keys
02:18 Print Key Names
02:49 Remove Duplicates
03:10 BASH Array
04:07 Read Array Entries
04:47 Convert Case
06:51 Create Script
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