Originally Posted by
conradin
if the config files are previously modified, this script will fail. So how can i fix it so that the line specifying port in the ssh_config file can be read and rewriten to numerous times. any ideas?
Code:
echo " select a port to forward ssh to Then hit ENTER"
read sshPort
echo "SSH Port is:" $sshPort
sed -i "s/22/$sshPort/g" "/etc/ssh/sshd_config"
sed -i 's/PermitRootLogin yes/PermitRootLogin no/g' "/etc/ssh/sshd_config"
The script will only replace the ssh port if it is currently set to 22.
Furthermore, what if the line is commented out?
I don't know about the version of sshd_config that Ubuntu ships, but the default values are usually stated and commented out, therefore changing the value without removing the # is pretty pointless.
Code:
# $OpenBSD: sshd_config,v 1.82 2010/09/06 17:10:19 naddy Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value.
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
# The default requires explicit activation of protocol 1
Protocol 2
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024
# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
LogLevel VERBOSE
# Authentication:
#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile .ssh/authorized_keys
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
#PermitEmptyPasswords no
# Change to no to disable s/key passwords
ChallengeResponseAuthentication no
{cut rest of file ---}
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