Shell script to log in to SSH server

[fr33dom]

Afternoon all,

Any help you can provide would be greatly appreciated.

NOTE : I am on a mac (Tiger 10.4 i.e. built on Unix) but I have a program that allows me to install any linux program. I think my issue is that I may be missing some, hence you may be able to point out the obvious.

i'm trying to write a shell script to automate the process of logging
in to a secure server.

Via Google I found :

SSH - Passing Unix login passwords through shell scripts - nixCraft Linux Forum

and

Ssh login expect script to supply password

and from that i've created :

ssh.login.exp

#!/usr/bin/expect -f
# set Variables
set username "username"
set password "boo"
set passwordroot "boo2"
set ipaddr "192.168.1.1" 
set timeout -1
# now connect to remote UNIX box (ipaddr) with given script to execute
spawn ssh $username@$ipaddr
match_max 100000
# Look for passwod prompt
expect "*?assword:*"
# Send password aka $password 
send -- "$password\r"
# send blank line (\r) to make sure we get back to gui
send -- "\r"
send -- "su\r"
# Look for passwod prompt
expect "*?assword:*"
# Send password aka $password 
send -- "$passwordroot\r"
expect eof

with the following result :

computer:~/Sites/shortcuts/wm fr33dom$ sh ssh.login.exp
ssh.login.exp: line 24: spawn: command not found
ssh.login.exp: line 25: match_max: command not found
couldn't read file "*?assword:*": no such file or directory
ssh.login.exp: line 29: send: command not found
ssh.login.exp: line 31: send: command not found
ssh.login.exp: line 32: send: command not found
couldn't read file "*?assword:*": no such file or directory
ssh.login.exp: line 36: send: command not found
couldn't read file "eof": no such file or directory

now, i've done as that first link instructed and installed the expects
module via a program called finkcommander:

Fink - Home
How to install Linux applications in OS X - a complete walkthrough - Simplehelp

yet, as you can see... no joy.

Am i missing some other linux programs maybe? or am i not calling the script correctly?

thanks again for your help,
fr33dom

[anomie]

Pubkey authentication (with no passphrase for the key) is a common way to do this.

[fr33dom]

thanks mate, i had a look and found :

Howto Linux / UNIX setup SSH with DSA public key authentication (password less login)

Is this what you mean?

If so, I was also hoping to automate the second part that was to login as a root user. I'm not sure why I can't do this directly but it seems I cannot. Hence this workaround.

I can't figure out why my spawn command won't work from the .exp file, nor a .sh file. I have run "man spawn" and it exists so... What's the story?

As you can see, my knowledge of shell scripts is minute. Apologies.

Thanks again,
fr33dom

[anomie]

The walkthru you posted looks ok, except in step 2 I would set ~/.ssh directory permissions to 700 instead. Remember to use a blank passphrase, since this logon will be running from a script.

If you need to execute a command on the remote side (as root) you might look into making your user a sudoer for just that command and, again, not requiring a password to do it.

[rnls001]

Hi Experts,

The information provided here is really helpful but it does not serve my requirements.

I have more than 200 machines in my network running linux and I want to be able to ssh to each one of them using thier IP address stored in a file and then run some commands inside each machine, log out and log in the next machine in the list and do the same, so on ...

Now, using key-gen is not practical for me and I do not want to install the "expect" utility due to some reason.

Please tell me if there is any way to supply ssh password using bash scripting? I know supplying the password in script might not be very secure, but still I want to do it this way. I shall be greatful to any help.

Regards, R.

[anomie]

The information provided here is really helpful but it does not serve my requirements.

Then you should probably start your own thread.