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#!/bin/sh
# abuild-keygen - generate signing keys
# Copyright (c) 2009 Natanael Copa <ncopa@alpinelinux.org>
#
# Distributed under GPL-2
#
program_version=@VERSION@
sharedir=${ABUILD_SHAREDIR:-@sharedir@}
SUDO="${SUDO:-sudo}"
if ! [ -f "$sharedir/functions.sh" ]; then
echo "$sharedir/functions.sh: not found" >&2
exit 1
fi
. "$sharedir/functions.sh"
# ask for privkey unless non-interactive mode
# returns value in global $privkey
get_privkey_file() {
local emailaddr default_name
emailaddr=${PACKAGER##*<}
emailaddr=${emailaddr%%>*}
# if PACKAGER does not contain a valid email address, then ask git
if [ -z "$emailaddr" ] || [ "${emailaddr##*@}" = "$emailaddr" ]; then
emailaddr=$(git config --get user.email 2>/dev/null)
fi
default_name="${emailaddr:-$USER}-$(printf "%x" $(date +%s))"
privkey="$ABUILD_USERDIR/$default_name.rsa"
[ -n "$non_interactive" ] && return 0
msg "Generating public/private rsa key pair for abuild"
echo -n "Enter file in which to save the key [$privkey]: "
read line
if [ -n "$line" ]; then
privkey="$line"
fi
}
do_keygen() {
mkdir -p "$ABUILD_USERDIR"
get_privkey_file
pubkey="$privkey.pub"
# generate the private key in a subshell with stricter umask
(
umask 0007
openssl genrsa -out "$privkey" "$numbits"
)
openssl rsa -in "$privkey" -pubout -out "$pubkey"
if [ -n "$install_pubkey" ]; then
msg "Installing $pubkey to /etc/apk/keys..."
$SUDO mkdir -p /etc/apk/keys
$SUDO cp -i "$pubkey" /etc/apk/keys/
else
msg ""
msg "You'll need to install $pubkey into "
msg "/etc/apk/keys to be able to install packages and repositories signed with"
msg "$privkey"
fi
if [ -n "$append_config" ]; then
if [ -f "$ABUILD_USERCONF" ]; then
# comment out the existing values
sed -i -e 's/^PACKAGER_PRIVKEY=/\#&/' "$ABUILD_USERCONF"
fi
echo "PACKAGER_PRIVKEY=\"$privkey\"" >> "$ABUILD_USERCONF"
else
msg ""
msg "You might want add following line to $ABUILD_USERCONF:"
msg ""
msg "PACKAGER_PRIVKEY=\"$privkey\""
msg ""
fi
msg ""
msg "Please remember to make a safe backup of your private key:"
msg "$privkey"
msg ""
}
usage() {
cat >&2 <<-__EOF__
$program $program_version - generate signing keys
Usage: $program [-a|--append] [-i|--install] [-n]
Options:
-a, --append Set PACKAGER_PRIVKEY=<generated key> in
$ABUILD_USERCONF
-i, --install Install public key into /etc/apk/keys using sudo
-n Non-interactive. Use defaults
-b, --numbits [BITS] The size of the private key to generate in bits.
-q, --quiet
-h, --help Show this help
The SUDO variable can be set to pick which tool can be used to
elevate privileges, if it is not set it defaults to sudo.
__EOF__
}
append_config=
install_pubkey=
non_interactive=
numbits=2048
quiet=
args=$(getopt -o ab:inqh --long append,numbits:,install,quiet,help -n "$program" -- "$@")
if [ $? -ne 0 ]; then
usage
exit 2
fi
eval set -- "$args"
while true; do
case $1 in
-a|--append) append_config=1;;
-i|--install) install_pubkey=1;;
-n) non_interactive=1;;
-b|--numbits) numbits="$2"; shift 1;;
-q|--quiet) quiet=1;; # suppresses msg
-h|--help) usage; exit;;
--) shift; break;;
*) exit 1;; # getopt error
esac
shift
done
if [ $# -ne 0 ]; then
usage
exit 2
fi
do_keygen
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