SSH on Multiple ports Fedora Core 4
From: John Gallagher (john.gallagher_at_ciosystems.com)
Date: 11/28/05
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To: <fedora-list@redhat.com> Date: Mon, 28 Nov 2005 13:47:00 -0800
I have created a separate config file for SSH to run and listen on another
port (for example: 5000 RSA connections only). I created another init
script called sshd-ext in /etc/init.d (Minor Modifications see file below).
I created file to call the new config in /etc/sysconfig/sshd-ext.
All seems to work fine except I get errors in the security logs. Which I
have seen from others post on the Fedora forum.
Nov 28 12:26:58 vpn sshd[26691]: error: Bind to port 5000 on 0.0.0.0 failed:
Address already in use.
Nov 28 12:35:42 vpn sshd[26691]: Received signal 15; terminating.
I edited the conf file and specified the IP Address of the interface to use
for this config:
Port 5000
#Protocol 2,1
ListenAddress 10.200.16.10
#ListenAddress 0.0.0.0
#ListenAddress ::
I verified the original sshd_confid was only listening on 0.0.0.0 and not ::
The problem is ssh seems to use the same PID for both processes and always
wants to bind on port 22 for some reason. If I restart one of the processes
it can and sometimes does kill the other process.
service sshd restart will kill the process started as sshd-ext.
I also run the same config on FC1 and I have do not have these issues.
See version and intit scripts below:
[root@vpn root]# rpm -qa |grep ssh
openssh-askpass-3.6.1p2-34
openssh-3.6.1p2-34
openssh-clients-3.6.1p2-34
openssh-askpass-gnome-3.6.1p2-34
openssh-server-3.6.1p2-34
[root@vpn root]#
[root@vpn root]# cat /etc/init.d/sshd-ext
#!/bin/bash
#
# Init file for OpenSSH server daemon
#
# chkconfig: 2345 55 25
# description: OpenSSH server daemon
#
# processname: sshd
# config: /etc/ssh/ssh_host_key
# config: /etc/ssh/ssh_host_key.pub
# config: /etc/ssh/ssh_random_seed
# config: /etc/ssh/sshd_config
# pidfile: /var/run/sshd-ext.pid
# source function library
. /etc/rc.d/init.d/functions
# pull in sysconfig settings
[ -f /etc/sysconfig/sshd-ext ] && . /etc/sysconfig/sshd-ext
RETVAL=0
prog="sshd"
# Some functions to make the below more readable
KEYGEN=/usr/bin/ssh-keygen
SSHD=/usr/sbin/sshd
RSA1_KEY=/etc/ssh/ssh_host_key
RSA_KEY=/etc/ssh/ssh_host_rsa_key
DSA_KEY=/etc/ssh/ssh_host_dsa_key
PID_FILE=/var/run/sshd-ext.pid
do_rsa1_keygen() {
if [ ! -s $RSA1_KEY ]; then
echo -n $"Generating SSH1 RSA host key: "
if $KEYGEN -q -t rsa1 -f $RSA1_KEY -C '' -N '' >&/dev/null;
then
chmod 600 $RSA1_KEY
chmod 644 $RSA1_KEY.pub
success $"RSA1 key generation"
echo
else
failure $"RSA1 key generation"
echo
exit 1
fi
fi
}
do_rsa_keygen() {
if [ ! -s $RSA_KEY ]; then
echo -n $"Generating SSH2 RSA host key: "
if $KEYGEN -q -t rsa -f $RSA_KEY -C '' -N '' >&/dev/null;
then
chmod 600 $RSA_KEY
chmod 644 $RSA_KEY.pub
success $"RSA key generation"
echo
else
failure $"RSA key generation"
echo
exit 1
fi
fi
}
do_dsa_keygen() {
if [ ! -s $DSA_KEY ]; then
echo -n $"Generating SSH2 DSA host key: "
if $KEYGEN -q -t dsa -f $DSA_KEY -C '' -N '' >&/dev/null;
then
chmod 600 $DSA_KEY
chmod 644 $DSA_KEY.pub
success $"DSA key generation"
echo
else
failure $"DSA key generation"
echo
exit 1
fi
fi
}
do_restart_sanity_check()
{
$SSHD -t
RETVAL=$?
if [ ! "$RETVAL" = 0 ]; then
failure $"Configuration file or keys are invalid"
echo
fi
}
start()
{
# Create keys if necessary
do_rsa1_keygen
do_rsa_keygen
do_dsa_keygen
echo -n $"Starting $prog:"
initlog -c "$SSHD $OPTIONS" && success || failure
RETVAL=$?
[ "$RETVAL" = 0 ] && touch /var/lock/subsys/sshd-ext
echo
}
stop()
{
echo -n $"Stopping $prog:"
killproc $SSHD -TERM
RETVAL=$?
[ "$RETVAL" = 0 ] && rm -f /var/lock/subsys/sshd-ext
echo
}
reload()
{
echo -n $"Reloading $prog:"
killproc $SSHD -HUP
RETVAL=$?
echo
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
reload)
reload
;;
condrestart)
if [ -f /var/lock/subsys/sshd-ext ] ; then
do_restart_sanity_check
if [ "$RETVAL" = 0 ] ; then
stop
# avoid race
sleep 3
start
fi
fi
;;
status)
status $SSHD
RETVAL=$?
;;
*)
echo $"Usage: $0
{start|stop|restart|reload|condrestart|status}"
RETVAL=1
esac
exit $RETVAL
[root@vpn root]#
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