Home / ubuntu / Questions

Questions[sshpass](ubuntu)

Martin Hope
Jay Boyle
Asked: 2020-10-09 08:57:38 +0800 CST
  • 1

I am trying to prevent remote access for my laptop.

I went into sshd_config to try and set it up. My IT guy recommended the following changes to accomplish this:

PermitRootLogin no
PubkeyAuthentication no
PasswordAuthentication no

However, when I went to make the changes the line of code says:

#PermitRootLogin prohibit

This seems like a double negative. so yes means prohibit and no means don't prohibit. Can anyone confirm?

ssh sshpass
Martin Hope
gervais.b
Asked: 2020-07-09 01:33:12 +0800 CST
  • 4

I have a script with ssh commands that are using a jump host:

scp -J user@jump file admin@server
ssh -J user@jump admin@server "touch hello"

I would like to ask for the passwords only once and tried sshpass:

sshpass -p "PasswordForJump" scp -J user@jump file admin@server

This will only ask the password for admin@server. However, since there are two ssh/scp commands, I still have to enter the admin password twice.

I tried to nest the sshpass but the script is blocked:

sshpass -p "PasswordForJump" sshpass -p "PasswordForServer" ssh -J user@jump admin@server

Naively I have tried to set the two passwords in a file (one per line) by expecting sshpass to use one after the other but this fail too.

Can I use sshpass to supply two passwords ?

ssh password sshpass
Martin Hope
CIsForCookies
Asked: 2019-02-19 04:48:37 +0800 CST
  • 2

I have this small script for connecting to new machines I don't have ssh-key to:

function my_ssh () {
    ip=$1
    optional_cmd=$2

    ssh -o "BatchMode yes" user_name@$ip exit > /dev/null 2>&1

    if [ $? -gt 0 ]; then
        echo "1st time connection - adding key to authorized keys list"
        sshpass -p "secret_password" ssh-copy-id user_name@$ip
    fi

    echo $optional_cmd
    ssh -X user_name@$ip $optional_cmd
}

This works weel for servers that either have my ssh-key, or only ask for a password in order to use ssh-copy-id. However, some servers require a "yes/no" after the following question:

The authenticity of host 'A.B.C.D ()' can't be established. ECDSA key fingerprint is SHA256:****. Are you sure you want to continue connecting (yes/no)?

How can I add a "yes" string echoed into the server question stdin and then use the sshpass?

ps, I went over the sshpass code from github but it doesn't seem sshpass is designed for something like this. I think I can modify it to suite my needs, but I prefer using a normal Linux mechanism if possible

server ssh sshpass
Martin Hope
Dax Mickelson
Asked: 2018-08-14 12:51:13 +0800 CST
  • 3

I've built 2 fresh VMs of Ubuntu server. One is from the 18.04.1 ISO and the other is from an older 18.04 ISO. The issue I'm having is that 'apt get install ansible' doesn't work on the 18.04.1 VM whereas it will work on the 18.04 VM. (I should note that even if I add the ppa:ansible/ansible to the 18.04.1 VM it still doesn't work because it needs the sshpass module which also doesn't appear accessible on 18.04.1.)

So, digging into the differences between the two VMs I noticed that the 18.04 VM has 10 or so repositories (not including deb-src lines) in its /etc/apt/source.list file whereas the 18.04.1 only has 4.

I didn't see any notes in the 18.04.1 readme to indicate that the sources.list file would be different. So, what am I doing wrong here?

server apt 18.04 sshpass