scripts/encryption/import_ssh_key.sh

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2020-04-20 20:22:54 +02:00
#!/bin/sh
function help {
echo "NAME"
echo " $(basename $0) - import an OpenSSH key from a file or from stdin"
echo ""
echo "SYNOPSYS"
echo " $(basename $0) -n NAME [-f FILE]"
echo ""
echo "OPTIONS"
echo " -n, --name=KEYNAME"
echo " The key name, e.g. \"id\", which would result in a private key file ~/.ssh/id_rsa,"
echo " ~/.ssh/id_dsa, ~/.ssh/id_ecdsa or .ssh/id_ed25519 (depending on the key type)."
echo ""
echo " -f, --file=FILE"
echo " The file containing the private key that will be imported. If this option is not"
echo " specified, the private key will be read from stdin."
echo ""
echo " -h, --help"
echo " Display this help message."
echo ""
echo "AUTHOR"
echo " Written by Christian Ulrich, christian@ulrich.earth"
}
function import {
local private_key="$1"
local name="$2"
local public_key=$(ssh-keygen -yf /dev/stdin <<< $private_key)
local type=$(
ssh-keygen -lf /dev/stdin <<< $public_key |
rev |
cut -d" " -f1 |
rev |
tr -d '()' |
tr '[:upper:]' '[:lower:]')
local private_key_file=~/.ssh/${name}_${type}
local public_key_file=~/.ssh/${name}_${type}.pub
echo "$private_key" > $private_key_file
chmod 0600 $private_key_file
echo "$public_key" > $public_key_file
chmod 0644 $public_key_file
echo "Successfully imported key."
echo "Private key stored at ${private_key_file}"
echo "Public key stored at ${public_key_file}"
}
function main {
while [[ $# -gt 0 ]]; do
local opt="$1"
case $opt in
-n|--name)
local name="$2"
shift
shift
;;
-f|--file)
local file_path="$2"
shift
shift
;;
-h|--help)
help
return 0
;;
*)
help
return 1
esac
done
if [ -z "$name" ]; then
help
return 1
fi
if [ -z "$file_path" ]; then
local private_key=$(</dev/stdin)
else
local private_key=$(<$file_path)
fi
import "$private_key" "$name"
}
set -e
main "$@"