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#!/bin/bash
#
# Generate keypairs.
#
# This script is just a wrapper to easily generate keys for
# automated systems.
#
# Generate a keypair, ssh version
function keygen_ssh {
echo "Make sure that $homedir is atop of an encrypted volume."
read -p "Hit ENTER to continue." prompt
# TODO: programatically enter blank passphrase twice
ssh-keygen -t dsa -f $homedir/id_dsa -C "root@$hostname"
echo "Now make sure to save this key in a safe location."
echo "You can export it by securely copying $contents to $hostname."
}
# Generate a keypair, gpg version
function keygen_gpg {
echo "Make sure that $homedir is atop of an encrypted volume."
read -p "Enter password for the private key: " passphrase
# TODO: insert 279 random bytes
gpg --homedir $homedir --gen-key <<EOF
Key-Type: DSA
Key-Length: 1024
Subkey-Type: ELG-E
Subkey-Length: 4096
Name-Real: $hostname
Name-Comment: backupninja
Name-Email: root@$hostname
Expire-Date: 0
Passphrase: $passphrase
%commit
EOF
echo "Now make sure to save this key in a safe location."
echo "You can export it using 'gpg --homedir $homedir --armor --export-secret-keys'."
echo "Then securely copy it to $hostname."
}
# Setup
keytype="$1"
homedir="$2"
hostname="$3"
# Verify
if [ -z "$hostname" ]; then
echo "Usage: `basename $0` <gpg|ssh> <homedir> <hostname>"
exit 1
elif [ -e "$homedir" ]; then
echo "Folder $homedir already exists, leaving"
exit 1
fi
# Prepare
mkdir -p $homedir && chmod 700 $homedir
if [ "$?" != "0" ]; then
echo "Error setting up $homedir"
exit 1
fi
# Dispatch
keygen_$keytype
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