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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) KEYCOMMENT="$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 "rm --force $PUBRING $BATCHFILE; shred --remove $SECRING" 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 --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 --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"