Script Name: SSH Key Authentication Generator Language: Bash Purpose: Automate generation of SSH key files (id_rsa & id_rsa.pub for example), for use with passwordless SSH authentication. Notes: This is a modified version of a script I have on my blog, http://www.itknowledgeexchange.com/security-admin/ (direct link: http://itknowledgeexchange.techtarget.com/security-admin/bash-script-for-ssh-key-generation/ ) as I feel the automated version is a lot more resourcesful. #!/bin/bash # Make sure input is not printed to screen (since we are typing in a password after all) stty -echo read -p "Passphrase: " pp stty echo # ssh-keygen prohibits passphrases < 4 characters if [ "${#pp}" -lt 4 ]; then     echo -e "nPassphrase must be greater than 4 characters."     exit 1 fi # man ssh-keygen specifies that for RSA, 2048-bit keys are considered efficient. bits=2048 # Debatable whether DSA or RSA is really more secure here, but RSA is more of the standard when it comes to this enc="rsa" # Default path where all keys are stored kf="$HOME/.ssh/id_$enc" # Check to see if the file exists first (if so, delete it) echo -n "Checking to see if $kf exists (deleting if so)..." if [ -e "$kf" ]; then     rm -rf $kf fi echo -e -n "done.nGenerating a $bits bit $enc key file for SSH ($kf)..." ssh-keygen -q -b $bits -t $enc -N $pp -f "$kf" if [ -e "$kf" ]; then     echo "done." else     echo "error." fi exit 0 [/pre]

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