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Roger
Asked: 2015-10-08 17:55:02 +0800 CST

How to use expect in Bash script and ssh-copy-id

  • 772

From a bash script:

source ./expect.sh

I am including a expect code:

#!/bin/bash
/usr/bin/expect <<EOL
spawn ssh-copy-id -i /home/user/.ssh/id_rsa.pub 111.111.111
expect '*?assword*'
send 'thepassword'
interact
EOL

And I am getting this:

spawn ssh-copy-id -i /home/user/.ssh/id_rsa.pub 111.111.111.111
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]'s password:

Then I try to connect and I am prompted for a password...

Checking the server, I'm certain no key was uploaded because I would expect to list the "authorized_keys" file:

root@server: ls /home/user/.ssh/
known_hosts

What am I doing wrong?

ssh

4 Answers

  1. The problem is that the ssh client is reading directly from the terminal for the password, not from stdin.

    The easiest way I know around this is to install 'sshpass', then use this (without Expect):

    sshpass -p "thepassword" ssh-copy-id -i /home/user/.ssh/id_rsa.pub [email protected]
    • 3

  2. You are copying the key to /root/.ssh/authorized_keys rather than the user account. Note where it says: [email protected]'s password:

    • 1

  3. The following script should do the trick too

    #!/usr/bin/expect -f
#
# Install RSA SSH KEY with no passphrase
#

set user [lindex $argv 0]
set host [lindex $argv 1]
set password [lindex $argv 2]
spawn ssh-copy-id -i /path/to/your/.ssh/id_rsa.pub $user@$host

expect {
    "continue" { send "yes\n"; exp_continue }
    "assword:" { send "$password\n"; }
}

    You need to make it executable, and call it as follow:

    ./ssh-copy-id.exp <user> <host> <password>

    In your case:

    ./ssh-copy-id.exp root 111.111.111.111 thepassword
    • 1

  4. !/usr/bin/env bash

              fingerprints(){
          /usr/bin/expect -c "set timeout 50; spawn ssh-copy-id -i /root/.ssh/id_rsa.pub -p\ <port num>\ root@$<your server>;
          
          expect {
                  \"assword: \" {
                  send \<your pwd>\n\"
                  expect {
                      \"again.\"     { exit 1 }
                      \"expecting.\" { }
                      timeout      { exit 1 }
                  }
              }
              \"(yes/no)? \" {
                  send \"yes\n\"
                  expect {
                      \"assword: \" {
                          send \"<your pwd>\n\"
                          expect {
                              \"again.\"     { exit 1 }
                              \"expecting.\" { }
                              timeout      { exit 1 }
                          }
                      }
                  }
              }
          }"
          }

    fingerprints

    • -1