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ssh.bash
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ssh.bash
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#!/usr/bin/env bash
# pass ssh - Password Store Extension (https://www.passwordstore.org/)
# Copyright (C) 2019 Pierre PENNINCKX <ibizapeanut@gmail.com>.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
PASSWORD_STORE_DIR="${PASSWORD_STORE_DIR:-$HOME/.password-store}"
die() {
echo "$@"
exit 1
}
cmd_ssh_usage() {
cat <<-_EOF
$(cmd_ssh_short_usage)
Provide an interactive solution to create ssh private and public
keypairs with passphrases stored in pass as well as write the
public key to stdout. It will show all available ssh keys in
either fzf or rofi, wait for the user to select one and write
the public key to stdout.
The user can select fzf or rofi by giving either --fzf or
--rofi. By default, rofi will be selected and pass-ssh will
fallback to fzf.
If the selected key file does not exist under the directory
given by --ssh-dir, first a passphrase will be generated in pass
under the prefix given by --pass-prefix. Specific passphrase
length can be given using --passphrase-length and no symbols can
be activated with --passphrase-no-symbols. Second, a new private
and public keypair will be generated with the aforementioned
passphrase and with ssh-keygen's -t and -b option given
respectively by --ssh-t and --ssh-b. Lastly, the public key is
written to stdout.
If the selected key exists, the public key is simply writeen to
stdout.
Options:
-f, --fzf Use fzf to select key files.
-r, --rofi Use rofi to select key files.
-d, --ssh-dir Directory holding ssh keyfiles,
default $HOME/.ssh.
-p, --pass-prefix Prefix under which passphrase are
stored in pass, default sshkey-passphrase.
-n, --passphrase-no-symbols Do not use any non-alphanumeric characters
to generate the passphrase.
-l, --passphrase-length Length of the passphrase to be generated.
--ssh-t ssh-keygen's -t option, the type of key
to create.
--ssh-b ssh-keygen's -b option, the number of bits
in the key to create.
_EOF
exit 0
}
cmd_ssh_short_usage() {
echo "Usage: pass ssh [--help,-h]" \
"[--fzf,-f]|[--rofi,-r]" \
"[--ssh-dir <s>,-d <s>]" \
"[--pass-prefix <s>,-p <s>]" \
"[--passphrase-no-symbols,-n]" \
"[--passphrase-length <s>,-l <s>]" \
"[--ssh-t <s>]" \
"[--ssh-b <s>]"
}
command_exists() {
command -v "$1" >/dev/null 2>&1 || exit 1
}
cmd_ssh() {
# Parse arguments
local opts fzf=0 rofi=0
local symbols="" length="25"
local ssh_dir="$HOME/.ssh"
local pass_prefix="sshkey-passphrase"
local ssh_type="rsa"
local ssh_bits=4096
opts="$($GETOPT -o frd:p:nl: -l fzf,rofi,ssh-dir:,pass-prefix:,passphrase-no-symbols,passphrase-length:,ssh-t:,ssh-b: -n "$PROGRAM $COMMAND" -- "$@")"
local err=$?
eval set -- "$opts"
while true; do case "$1" in
-f|--fzf) fzf=1; shift ;;
-r|--rofi) rofi=1; shift ;;
-d|--ssh-dir) ssh_dir="$2"; shift 2 ;;
-p|--pass-prefix) pass_prefix="$2"; shift 2 ;;
-n|--passphrase-no-symbols) symbols="--no-symbols"; shift ;;
-l|--passphrase-length) length="$2"; shift 2 ;;
--ssh-t) ssh_type="$2"; shift 2 ;;
--ssh-b) ssh_bits="$2"; shift 2 ;;
--) shift; break ;;
esac done
[[ $err -ne 0 ]] && die "$(cmd_ssh_short_usage)"
# Figure out if we use fzf or rofi
local prompt="Select a ssh key:"
local fzf_cmd="fzf --print-query --prompt=\"$prompt\" | tail -n1"
local rofi_cmd="rofi -dmenu -i -p \"$prompt\""
if [[ $fzf = 1 && $rofi = 1 ]]; then
die 'Either --fzf,-f or --rofi,-r must be given, not both'
fi
if [[ $rofi = 1 || $fzf = 0 ]]; then
command_exists rofi || die "Could not find rofi in \$PATH"
menu="$rofi_cmd"
elif [[ $fzf = 1 || $rofi = 0 ]]; then
command_exists fzf || die "Could not find fzf in \$PATH"
menu="$fzf_cmd"
else
if command_exists rofi; then
menu="$rofi_cmd"
elif command_exists fzf; then
menu="$fzf_cmd"
else
die "Could not find either fzf or rofi in \$PATH"
fi
fi
ssh_key=$(find "$ssh_dir" -name '*.pub' -printf '%P\n' \
| sed -e 's/.pub$//' \
| eval "$menu" )
if [ -z "$ssh_key" ]; then
die 'No ssh key selected.'
fi
local private_key="$ssh_dir/$ssh_key"
local public_key="$private_key.pub"
if ! [ -f "$public_key" ]; then
if [ -f "$private_key" ]; then
die "Will not overwrite private key $private_key, aborting."
fi
echo "Creating passphrase in $pass_prefix/$ssh_key"
pass generate "$pass_prefix/$ssh_key" $symbols "$length" >/dev/null
passphrase=$(pass show "$pass_prefix/$ssh_key" | xargs -0 echo -n)
if [ -z "$passphrase" ]; then
die "Failed to create passphrase."
fi
echo "Generating ssh key $private_key"
ssh-keygen -t "$ssh_type" -b "$ssh_bits" -f "$private_key" -N "$passphrase" </dev/null || exit 1
fi
xargs -0 echo -n < "$public_key"
}
[[ "$1" == "help" || "$1" == "--help" || "$1" == "-h" ]] && cmd_ssh_usage
cmd_ssh "$@"