On 10/31/06, Gilles CHAUVIN gcnweb@gmail.com wrote:

Hi all,

I'm wondering whether it is feasible or not to run two distinct sshd daemons with different config options!

I have a CentOS 4.4 gateway with 2 Ethernet interfaces. One is connected to the Internet and the other to the LAN.

Basically, what I would like to do is having a sshd that listens to the LAN interface with password enabled auth. and a sshd bound to the Internet interface with forced key auth. (no password auth. allowed).

I'm not sure that such a thing is possible using a single sshd_config file. What do you think would be the best way to do this? Is there someone here that already made a similar setup?

You need 2 different sshd_config files for there. 2 ways to achieve this

a) in /etc/rc.d/local

use sshd with -f parameter means you will pass another config file to it

b) creating another sshd daemon

i ) copy /etc/init.d/sshd to /etc/init.d/sshd1

Changes the settings where sshd is coming to sshd1 or something else. For example see below I have not pasted the whole file just few portions . I have change few settings like sshd to sshd1 , adding options file. You need to change all sshd to sshd1

/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/sshd1.pid

# source function library . /etc/rc.d/init.d/functions

# pull in sysconfig settings [ -f /etc/sysconfig/sshd1 ] && . /etc/sysconfig/sshd1

RETVAL=0 prog="sshd1"

# Some functions to make the below more readable KEYGEN=/usr/bin/ssh-keygen SSHD=/usr/sbin/sshd1 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/sshd1.pid OPTIONS="-f /etc/ssh/sshd_config1" 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 if [ -x /sbin/restorecon ]; then /sbin/restorecon $RSA1_KEY.pub fi success $"RSA1 key generation" echo else failure $"RSA1 key generation" echo exit 1 fi fi }

b) cp /usr/sbin/sshd /usr/sbin/sshd1

c) cp /etc/pam.d/sshd /etc/pam.d/sshd1

d) In the sshd_config1 file change the pid to sshd1 otherwise you will face problem

start sshd1

check the connections

netstat -atpn | grep ssh

you should see 2 ssh connections

If there is any problem add the port on which ur running the second sshd daemon to /etc/services file.

Regards

Ankush Grover