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#! /bin/sh
generate_key() {
local FILE=$1
local TYPE=$2
local DIR="$(dirname "$FILE")"
mkdir -p "$DIR"
ssh-keygen -q -f "${FILE}.tmp" -N '' -t $TYPE
# Atomically rename file public key
mv -f "${FILE}.tmp.pub" "${FILE}.pub"
# This sync does double duty: Ensuring that the data in the temporary
# private key file is on disk before the rename, and ensuring that the
# public key rename is completed before the private key rename, since we
# switch on the existence of the private key to trigger key generation.
# This does mean it is possible for the public key to exist, but be garbage
# but this is OK because in that case the private key won't exist and the
# keys will be regenerated.
#
# In the event that sync understands arguments that limit what it tries to
# fsync(), we provided them. If it does not, it will simply call sync()
# which is just as well
sync "${FILE}.pub" "$DIR" "${FILE}.tmp"
mv "${FILE}.tmp" "$FILE"
# sync to ensure the atomic rename is committed
sync "$DIR"
}
# /etc/default/ssh may set SYSCONFDIR and SSHD_OPTS
if test -f /etc/default/ssh; then
. /etc/default/ssh
fi
[ -z "$SYSCONFDIR" ] && SYSCONFDIR=/etc/ssh
mkdir -p $SYSCONFDIR
# parse sshd options
set -- ${SSHD_OPTS} --
sshd_config=/etc/ssh/sshd_config
while true ; do
case "$1" in
-f*) if [ "$1" = "-f" ] ; then
sshd_config="$2"
shift
else
sshd_config="${1#-f}"
fi
shift
;;
--) shift; break;;
*) shift;;
esac
done
# parse location of keys
HOST_KEY_RSA=$(grep ^HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$(grep HostKey "${sshd_config}" | grep _rsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_RSA}" ] && HOST_KEY_RSA=$SYSCONFDIR/ssh_host_rsa_key
HOST_KEY_DSA=$(grep ^HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$(grep HostKey "${sshd_config}" | grep _dsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_DSA}" ] && HOST_KEY_DSA=$SYSCONFDIR/ssh_host_dsa_key
HOST_KEY_ECDSA=$(grep ^HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$(grep HostKey "${sshd_config}" | grep _ecdsa_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_ECDSA}" ] && HOST_KEY_ECDSA=$SYSCONFDIR/ssh_host_ecdsa_key
HOST_KEY_ED25519=$(grep ^HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$(grep HostKey "${sshd_config}" | grep _ed25519_ | tail -1 | awk ' { print $2 } ')
[ -z "${HOST_KEY_ED25519}" ] && HOST_KEY_ED25519=$SYSCONFDIR/ssh_host_ed25519_key
# create keys if necessary
if [ ! -f $HOST_KEY_RSA ]; then
echo " generating ssh RSA key..."
generate_key $HOST_KEY_RSA rsa
fi
if [ ! -f $HOST_KEY_ECDSA ]; then
echo " generating ssh ECDSA key..."
generate_key $HOST_KEY_ECDSA ecdsa
fi
if [ ! -f $HOST_KEY_DSA ]; then
echo " generating ssh DSA key..."
generate_key $HOST_KEY_DSA dsa
fi
if [ ! -f $HOST_KEY_ED25519 ]; then
echo " generating ssh ED25519 key..."
generate_key $HOST_KEY_ED25519 ed25519
fi
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