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#!/bin/sh -e
#
# Mandos key generator - create a new OpenPGP key for a Mandos client
#
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
#
# 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/>.
#
# Contact the authors at <mandos@fukt.bsnet.se>.
#
VERSION="1.0"
KEYDIR="/etc/mandos"
KEYTYPE=DSA
KEYLENGTH=1024
KEYNAME="`hostname --fqdn`"
KEYEMAIL=""
KEYCOMMENT="Mandos client key"
KEYEXPIRE=0
FORCE=no
KEYCOMMENT_ORIG="$KEYCOMMENT"
# Parse options
TEMP=`getopt --options vhd:t:l:n:e:c:x:f \
--longoptions version,help,dir:,type:,length:,name:,email:,comment:,expire:,force \
--name "$0" -- "$@"`
help(){
cat <<EOF
Usage: `basename $0` [options]
Options:
-v, --version Show program's version number and exit
-h, --help Show this help message and exit
-d DIR, --dir DIR Target directory for key files
-t TYPE, --type TYPE Key type. Default is DSA.
-l BITS, --length BITS
Key length in bits. Default is 1024.
-n NAME, --name NAME Name of key. Default is the FQDN.
-e EMAIL, --email EMAIL
Email address of key. Default is empty.
-c COMMENT, --comment COMMENT
Comment field for key. The default value is
"Mandos client key".
-x TIME, --expire TIME
Key expire time. Default is no expiration.
See gpg(1) for syntax.
-f, --force Force overwriting old keys.
EOF
}
eval set -- "$TEMP"
while :; do
case "$1" in
-d|--dir) KEYDIR="$2"; shift 2;;
-t|--type) KEYTYPE="$2"; shift 2;;
-l|--length) KEYLENGTH="$2"; shift 2;;
-n|--name) KEYNAME="$2"; shift 2;;
-e|--email) KEYEMAIL="$2"; shift 2;;
-c|--comment) KEYCOMMENT="$2"; shift 2;;
-x|--expire) KEYEXPIRE="$2"; shift 2;;
-f|--force) FORCE=yes; shift;;
-v|--version) echo "$0 $VERSION"; exit;;
-h|--help) help; exit;;
--) shift; break;;
*) echo "Internal error" >&2; exit 1;;
esac
done
if [ "$#" -gt 0 ]; then
echo "Unknown arguments: '$@'" >&2
exit 1
fi
SECKEYFILE="$KEYDIR/seckey.txt"
PUBKEYFILE="$KEYDIR/pubkey.txt"
# Check for some invalid values
if [ -d "$KEYDIR" ]; then :; else
echo "$KEYDIR not a directory" >&2
exit 1
fi
if [ -w "$KEYDIR" ]; then :; else
echo "Directory $KEYDIR not writeable" >&2
exit 1
fi
if [ -z "$KEYTYPE" ]; then
echo "Empty key type" >&2
exit 1
fi
if [ -z "$KEYNAME" ]; then
echo "Empty key name" >&2
exit 1
fi
if [ -z "$KEYLENGTH" ] || [ "$KEYLENGTH" -lt 512 ]; then
echo "Invalid key length" >&2
exit 1
fi
if [ -z "$KEYEXPIRE" ]; then
echo "Empty key expiration" >&2
exit 1
fi
# Make FORCE be 0 or 1
case "$FORCE" in
[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]) FORCE=1;;
[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|*) FORCE=0;;
esac
if { [ -e "$SECKEYFILE" ] || [ -e "$PUBKEYFILE" ]; } \
&& [ "$FORCE" -eq 0 ]; then
echo "Refusing to overwrite old key files; use --force" >&2
exit 1
fi
# Set lines for GnuPG batch file
if [ -n "$KEYCOMMENT" ]; then
KEYCOMMENTLINE="Name-Comment: $KEYCOMMENT"
fi
if [ -n "$KEYEMAIL" ]; then
KEYEMAILLINE="Name-Email: $KEYEMAIL"
fi
# Create temp files
BATCHFILE="`mktemp -t mandos-gpg-batch.XXXXXXXXXX`"
SECRING="`mktemp -t mandos-gpg-secring.XXXXXXXXXX`"
PUBRING="`mktemp -t mandos-gpg-pubring.XXXXXXXXXX`"
# Remove temporary files on exit
trap "
set +e
rm --force $PUBRING $BATCHFILE;
shred --remove $SECRING;
stty echo
" EXIT
# Create batch file for GnuPG
cat >"$BATCHFILE" <<EOF
Key-Type: $KEYTYPE
Key-Length: $KEYLENGTH
#Key-Usage: encrypt,sign,auth
Name-Real: $KEYNAME
$KEYCOMMENTLINE
$KEYEMAILLINE
Expire-Date: $KEYEXPIRE
%pubring $PUBRING
%secring $SECRING
%commit
EOF
umask 027
# Generate a new key in the key rings
gpg --no-random-seed-file --quiet --batch --no-tty \
--no-default-keyring --no-options --batch \
--secret-keyring "$SECRING" --keyring "$PUBRING" \
--gen-key "$BATCHFILE"
rm --force "$BATCHFILE"
# Backup any old key files
if cp --backup=numbered --force "$SECKEYFILE" "$SECKEYFILE" \
2>/dev/null; then
shred --remove "$SECKEYFILE"
fi
if cp --backup=numbered --force "$PUBKEYFILE" "$PUBKEYFILE" \
2>/dev/null; then
rm --force "$PUBKEYFILE"
fi
FILECOMMENT="Mandos client key for $KEYNAME"
if [ "$KEYCOMMENT" != "$KEYCOMMENT_ORIG" ]; then
FILECOMMENT="$FILECOMMENT ($KEYCOMMENT)"
fi
if [ -n "$KEYEMAIL" ]; then
FILECOMMENT="$FILECOMMENT <$KEYEMAIL>"
fi
# Export keys from key rings to key files
gpg --no-random-seed-file --quiet --batch --no-tty --armor \
--no-default-keyring --no-options --secret-keyring "$SECRING" \
--keyring "$PUBRING" --export-options export-minimal \
--comment "$FILECOMMENT" --output "$SECKEYFILE" \
--export-secret-keys
gpg --no-random-seed-file --quiet --batch --no-tty --armor \
--no-default-keyring --no-options --secret-keyring "$SECRING" \
--keyring "$PUBRING" --export-options export-minimal \
--comment "$FILECOMMENT" --output "$PUBKEYFILE" \
--export
trap - EXIT
# Remove the key rings
shred --remove "$SECRING"
rm --force "$PUBRING"
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