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Filename : sshd-keygen
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#!/usr/bin/bash

# Create the host keys for the OpenSSH server.
KEYTYPE=$1
case $KEYTYPE in
	"dsa") ;& # disabled in FIPS
	"ed25519")
		FIPS=/proc/sys/crypto/fips_enabled
		if [[ -r "$FIPS" && $(cat $FIPS) == "1" ]]; then
			exit 0
		fi ;;
	"rsa")
		if [[ ! -z $SSH_RSA_BITS  ]]; then
			SSH_KEYGEN_OPTIONS="-b $SSH_RSA_BITS"
		fi ;; # always ok
	"ecdsa") 
		if [[ ! -z $SSH_ECDSA_BITS  ]]; then
			SSH_KEYGEN_OPTIONS="-b $SSH_ECDSA_BITS"
		fi ;;
	*) # wrong argument
		exit 12 ;;
esac
KEY=/etc/ssh/ssh_host_${KEYTYPE}_key

KEYGEN=/usr/bin/ssh-keygen
if [[ ! -x $KEYGEN ]]; then
	exit 13
fi

# remove old keys
rm -f $KEY{,.pub}

# create new keys
if ! $KEYGEN -q -t $KEYTYPE $SSH_KEYGEN_OPTIONS -f $KEY -C '' -N '' >&/dev/null; then
	exit 1
fi

# sanitize permissions
/usr/bin/chgrp ssh_keys $KEY
/usr/bin/chmod 640 $KEY
/usr/bin/chmod 644 $KEY.pub
if [[ -x /usr/sbin/restorecon ]]; then
	/usr/sbin/restorecon $KEY{,.pub}
fi

exit 0