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#!/bin/sh
#################################################################
# #
# Copyright (c) 2010-2021 Fidelity National Information #
# Services, Inc. and/or its subsidiaries. All rights reserved. #
# #
# This source code contains the intellectual property #
# of its copyright holder(s), and is made available #
# under a license. If you do not know the terms of #
# the license, please stop and do not read further. #
# #
#################################################################
#############################################################################################
#
# gen_keypair.sh - Generates a new public/private key pair for the current user.
# The email address identifies the user. It is an error if the gpg keyring exists.
#
# Arguments:
# $1 - Email ID of the current user
# $2 - Optional; Any residual text on line is full name of user
#
#############################################################################################
# GnuPG uses $GNUPGHOME, if set, for GNU Privacy Guard keyring
# Script uses $gtm_pubkey, if set for file containing exported ASCII armored public key
hostos=`uname -s`
# temporary file
if [ -x "$(command -v mktemp)" ] ; then tmp_file=`mktemp`
else tmp_file=/tmp/`basename $0`_$$.tmp ; fi
touch $tmp_file
chmod go-rwx $tmp_file
trap 'rm -rf $tmp_file ; stty sane ; exit 1' HUP INT QUIT TERM TRAP
# echo and options
ECHO=/bin/echo
ECHO_OPTIONS=""
#Linux honors escape sequence only when run with -e
if [ "Linux" = "$hostos" ] ; then ECHO_OPTIONS="-e" ; fi
# e-mail address is a mandatory parameter for GnuPG and cannot be null.
if [ $# -lt 1 ] ; then
$ECHO "Usage: `basename $0` email_address [Real name]" ; exit 1
fi
email=$1 ; shift
# Identify GnuPG - it is required
gpg=`command -v gpg2`
if [ -z "$gpg" ] ; then gpg=`command -v gpg` ; fi
if [ -z "$gpg" ] ; then $ECHO "Unable to find gpg2 or gpg. Exiting" ; exit 1 ; fi
# Default file for exported public key, if not specified
if [ -z "$gtm_pubkey" ] ; then gtm_pubkey="${email}_pubkey.txt" ; fi
# If nothing on the command line for the user name, use userid
if [ $# -ge 1 ] ; then gtm_user="$*" ; else gtm_user=$USER ; fi
# If GNUPGHOME is already defined, then use this as the place to store the keys. If undefined,
# use $HOME/.gnupg (default for GnuPG)
if [ -z "$GNUPGHOME" ]; then
gtm_gpghome="$HOME/.gnupg"
else
gtm_gpghome="$GNUPGHOME"
fi
if [ -d "$gtm_gpghome" -o -f "$gtm_gpghome" ] ; then
$ECHO "$gtm_gpghome already exists; cannot create a new directory" ; exit 1
fi
mkdir -p $gtm_gpghome
if [ ! -d $gtm_gpghome ] ; then
$ECHO "Unable to create directory $gtm_gpghome" ; exit 1
fi
trap 'rm -rf $tmp_file $gtm_gpghome ; stty sane ; exit 1' HUP INT QUIT TERM TRAP
chmod go-rwx $gtm_gpghome
# Get passphrase for new GnuPG keyring
unset passphrase
while [ -z "$passphrase" ] ; do
$ECHO $ECHO_OPTIONS Passphrase for new keyring: \\c ; stty -echo ; read passphrase ; stty echo ; $ECHO ""
$ECHO $ECHO_OPTIONS Verify passphrase: \\c ; stty -echo ; read tmp ; stty echo ; $ECHO ""
if [ "$passphrase" != "$tmp" ] ; then
$ECHO Verification does not match passphrase. Try again. ; unset passphrase
fi
unset tmp
done
# Fill out the unattended key generation details including the passphrase and email address
key_info="Key-Type: DSA\n Key-Length: 1024\n Subkey-Type: RSA\n Subkey-Length: 2048\n Name-Real: $gtm_user\n"
key_info=$key_info" Name-Email: $email\n Expire-Date: 0\n Passphrase: $passphrase\n %commit\n %echo Generated\n"
# Run the unattended GnuPG key generation. Any errors will be output to gen_key.log
# which will later be removed.
$ECHO Key ring will be created in $gtm_gpghome
$ECHO Key generation might take some time. Do something that will create entropy,
$ECHO like moving the mouse or typing in another session.
$ECHO $ECHO_OPTIONS $key_info | $gpg --homedir $gtm_gpghome --no-tty --batch --gen-key 2> $tmp_file
# Set up pinentry-gtm so that GnuPG version 2 pinentry will return password from
# obfuscated password. dir should be an absolute path name.
dir=`dirname $0`
if [ -z "$dir" ] ; then dir=$PWD
else
case $dir in
/*) ;;
.) dir=$PWD ;;
*) dir=$PWD/$dir ;;
esac
fi
$ECHO "pinentry-program $dir/pinentry-gtm.sh" >$gtm_gpghome/gpg-agent.conf
$gpg --homedir $gtm_gpghome --list-keys | grep "$email" >> $tmp_file
if [ $? -eq 0 ]; then
$gpg --homedir $gtm_gpghome --export --armor -o $gtm_pubkey
$gpg --homedir $gtm_gpghome --list-keys --fingerprint
$ECHO "Key pair created and public key exported in ASCII to $gtm_pubkey"
else
$ECHO "Error creating public key/private key pairs."
cat $tmp_file
fi
rm -f $tmp_file
|
