xref: /freebsd-10.2-release/etc/rc.d/sshd

#!/bin/sh
#
# $FreeBSD: head/etc/rc.d/sshd 249489 2013-04-14 21:11:19Z bdrewery $
#

# PROVIDE: sshd
# REQUIRE: LOGIN FILESYSTEMS
# KEYWORD: shutdown

. /etc/rc.subr

name="sshd"
rcvar="sshd_enable"
command="/usr/sbin/${name}"
keygen_cmd="sshd_keygen"
start_precmd="sshd_precmd"
restart_precmd="sshd_configtest"
configtest_cmd="sshd_configtest"
pidfile="/var/run/${name}.pid"
extra_commands="configtest keygen reload"

timeout=300

user_reseed()
{
	(
	seeded=`sysctl -n kern.random.sys.seeded 2>/dev/null`
	if [ "x${seeded}" != "x" ] && [ ${seeded} -eq 0 ] ; then
		warn "Setting entropy source to blocking mode."
		echo "===================================================="
		echo "Type a full screenful of random junk to unblock"
		echo "it and remember to finish with <enter>. This will"
		echo "timeout in ${timeout} seconds, but waiting for"
		echo "the timeout without typing junk may make the"
		echo "entropy source deliver predictable output."
		echo ""
		echo "Just hit <enter> for fast+insecure startup."
		echo "===================================================="
		sysctl kern.random.sys.seeded=0 2>/dev/null
		read -t ${timeout} junk
		echo "${junk}" `sysctl -a` `date` > /dev/random
	fi
	)
}

sshd_keygen()
{
	(
	umask 022

	# Can't do anything if ssh is not installed
	[ -x /usr/bin/ssh-keygen ] || {
		warn "/usr/bin/ssh-keygen does not exist."
		return 1
	}

	if [ -f /etc/ssh/ssh_host_key ]; then
		echo "You already have an RSA host key" \
		    "in /etc/ssh/ssh_host_key"
		echo "Skipping protocol version 1 RSA Key Generation"
	else
		/usr/bin/ssh-keygen -t rsa1 -b 1024 \
		    -f /etc/ssh/ssh_host_key -N ''
	fi

	if [ -f /etc/ssh/ssh_host_dsa_key ]; then
		echo "You already have a DSA host key" \
		    "in /etc/ssh/ssh_host_dsa_key"
		echo "Skipping protocol version 2 DSA Key Generation"
	else
		/usr/bin/ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
	fi

	if [ -f /etc/ssh/ssh_host_rsa_key ]; then
		echo "You already have an RSA host key" \
		    "in /etc/ssh/ssh_host_rsa_key"
		echo "Skipping protocol version 2 RSA Key Generation"
	else
		/usr/bin/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
	fi

	if [ -f /etc/ssh/ssh_host_ecdsa_key ]; then
		echo "You already have an ECDSA host key" \
		    "in /etc/ssh/ssh_host_ecdsa_key"
		echo "Skipping protocol version 2 ECDSA Key Generation"
	else
		/usr/bin/ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
	fi
	)
}

sshd_configtest()
{
	echo "Performing sanity check on ${name} configuration."
	eval ${command} ${sshd_flags} -t
}

sshd_precmd()
{
	if [ ! -f /etc/ssh/ssh_host_key -o \
	    ! -f /etc/ssh/ssh_host_dsa_key -o \
	    ! -f /etc/ssh/ssh_host_ecdsa_key -o \
	    ! -f /etc/ssh/ssh_host_rsa_key ]; then
		user_reseed
		run_rc_command keygen
	fi
	sshd_configtest
}

load_rc_config $name
run_rc_command "$1"