INSTALLF=/usr/sbin/installf
REMOVEF=/usr/sbin/removef
GROUPADD=/usr/sbin/groupadd
USERADD=/usr/sbin/useradd
GREP=/usr/bin/grep
CUT=/usr/bin/cut
CAT=/usr/bin/cat

CONFDIR=${BASEDIR}/etc
DESTBIN=${BASEDIR}/bin
CHECKCONF=0
SSHID=199

# We provide default config-files, check and see if they should be installed.
if [ ! -f "${CONFDIR}/ssh_config" ] ; then
	cp -p ${CONFDIR}/ssh_config.default ${CONFDIR}/ssh_config
	echo "Installing new ssh_config"
else
	echo "Keeping existing ssh_config"
	CHECKCONF=1
fi
if [ ! -f "${CONFDIR}/sshd_config" ] ; then
	cp -p ${CONFDIR}/sshd_config.default ${CONFDIR}/sshd_config
	echo "Installing new sshd_config"
else
	echo "Keeping existing sshd_config"
	CHECKCONF=1
fi
if [ -f "${CONFDIR}/ssh_prng_cmds" ] ; then
	rm -f ${CONFDIR}/ssh_prng_cmds.default ${CONFDIR}/ssh_prng_cmds
	echo "Removing unneeded ssh_prng_cmds file"

fi
if [ ! -f "${CONFDIR}/moduli" ] ; then
	if [ -f "${CONFDIR}/primes" ]; then
		echo "Keeping existing primes but renaming it to moduli"
		mv ${CONFDIR}/primes ${CONFDIR}/moduli
	else
		echo "Installing new moduli (formerly known as primes)"
		cp -p ${CONFDIR}/moduli.default ${CONFDIR}/moduli
	fi
else
	echo "Keeping existing moduli"
fi

# We will try to preserve any existing keys
if [ -f "${CONFDIR}/ssh_host_key" ] ; then
	echo "Keeping existing ssh_host_key"
else
	${DESTBIN}/ssh-keygen -t rsa1 -f ${CONFDIR}/ssh_host_key -N ""
fi
if [ -f "${CONFDIR}/ssh_host_dsa_key" ] ; then
	echo "Keeping existing ssh_host_dsa_key"
else
	${DESTBIN}/ssh-keygen -t dsa -f ${CONFDIR}/ssh_host_dsa_key -N ""
fi
if [ -f "${CONFDIR}/ssh_host_rsa_key" ] ; then
	echo "Keeping existing ssh_host_rsa_key"
else
	${DESTBIN}/ssh-keygen -t rsa -f ${CONFDIR}/ssh_host_rsa_key -N ""
fi

# Right, now move the init script into place and make some symlinks 
# for automatic startup.

# start by removing knowledge of sshd.init from the pkgdb
${REMOVEF} ${PKGINST} /usr/local/etc/sshd.init 2>&1 > /dev/null # suppress output

# confirm the changes to the pkgdb (removef -f)
${REMOVEF} -f ${PKGINST}

# Now that the holds from the pkgdb are gone, move the script to it's final destination.
mv /usr/local/etc/sshd.init /etc/init.d/sshd.local

# Install new *symlinks*
ln -s /etc/init.d/sshd.local /etc/rc0.d/K30sshd.local
ln -s /etc/init.d/sshd.local /etc/rc1.d/K30sshd.local
ln -s /etc/init.d/sshd.local /etc/rc2.d/S78sshd.local
ln -s /etc/init.d/sshd.local /etc/rcS.d/K30sshd.local

# Then installf the new pathnames
${INSTALLF} ${PKGINST} /etc/init.d/sshd.local f 744 root sys
${INSTALLF} ${PKGINST} /etc/rc2.d/S78sshd.local=/etc/init.d/sshd.local s
${INSTALLF} ${PKGINST} /etc/rc1.d/K30sshd.local=/etc/init.d/sshd.local s
${INSTALLF} ${PKGINST} /etc/rc0.d/K30sshd.local=/etc/init.d/sshd.local s
${INSTALLF} ${PKGINST} /etc/rcS.d/K30sshd.local=/etc/init.d/sshd.local s

# confirm the changes to the pkgdb (installf -f)
${INSTALLF} -f ${PKGINST}

#uh yeah, better make sure that /var/run exists aswell (for pid files)
echo "Checking to see if /var/run exists... \c"
if [ ! -d /var/run ]; then
   echo "no, creating..."
   mkdir -p /var/run;
   chown root:sys /var/run;
   chmod 755 /var/run
else
    echo "yes"
fi

# New in OpenSSH 3.3+ is Privilege seperation, it requires an empty dir to chroot into
# and an unprivileged user to run as.
echo "Checking to see if /var/empty/sshd exists... \c"
if [ ! -d /var/empty ]; then
    echo "no, creating..."
    mkdir -p /var/empty/sshd
    chown root:sys /var/empty/sshd
    chmod 755 /var/empty/sshd
else
    echo "yes"
fi

# Attempt to create a group & user for sshd
echo "Checking for sshd group... \c"
temp=`$GREP sshd /etc/group`
if [ -n "$temp" ]; then
    echo "yes"
    gid=`echo $temp|$CUT -d : -f 3`
    if [ "$gid" != "$SSHID" ]; then
	echo "  Group sshd found but gid does not match with the preferred ($SSHID)"
	echo "  I will continue anyway, but please check up on this afterwards!"
    fi
else
    echo "no"
    echo "  Attempting to create sshd group (gid=$SSHID)"
    $GROUPADD -g $SSHID sshd
    gid=$SSHID
fi

echo "Checking for sshd user... \c"
temp=`$GREP sshd /etc/passwd`
if [ -n "$temp" ]; then
    echo "yes"
    uid=`echo $temp|$CUT -d : -f 3`
    ugid=`echo $temp|$CUT -d : -f 4`
    if [ "$uid" != "$SSHID" ]; then
	echo "  User sshd found but uid doesn't match with the preferred ($SSHID)"
	echo "  I will continue anyway, but please check up on this afterwards!"
    fi
    if [ "$ugid" != "$gid" ]; then
	echo "  User sshd doesn't have group sshd!"
	echo "  I will continue anyway, but this is a critical error that must be resolved"
	echo "  before privilege seperation can be enabled!"
    fi
else
    echo "no"
    echo "  Attempting to create sshd user (uid=$SSHID, gid=$SSHID)"
    $USERADD -u $SSHID -g $SSHID -c "sshd privsep" -d /var/empty/sshd -s /bin/false sshd
fi

# FIXME Other stuff about the user/group situation should probably be checked
# FIXME like the homedir and shell of the sshd user

# Notice how the ssh host keys are not associated with the SBossh package.
# I find that convenient as I'm sure that they don't disappear if someone
# uninstalls the package.
# This is nice because we can then avoid the "hostid changed" warnings.  
# The config files will not be associated with the package either, this way when 
# installing a newer version the config files will be in place and will be preserved

# If original config-files where preserved, urge the operator
# to check the new default files for hints on recommended configuration
if [ "$CHECKCONF" = "1" ] ; then
	echo "#######"
	echo ""
	echo "Please check the *.default config files for configuration hints"
	echo "and update your existing config files accordingly."
fi