[linux] How to pass password to scp?

I know it is not recommended, but is it at all possible to pass the user's password to scp?

I'd like to copy a file via scp as part of a batch job and the receiving server does, of course, need a password and, no, I cannot easily change that to key-based authentication.

All the solutions mentioned above can work only if you the app installed or you should have the admin rights to install except or sshpass.

I found this very useful link to simply start the scp in Background.

$ nohup scp file_to_copy user@server:/path/to/copy/the/file > nohup.out 2>&1

https://charmyin.github.io/scp/2014/10/07/run-scp-in-background/

Nobody mentioned it, but Putty scp (pscp) has a -pw option for password.

Documentation can be found here: https://the.earth.li/~sgtatham/putty/0.67/htmldoc/Chapter5.html#pscp

Here is an example of how you do it with expect tool:

sub copyover {
    $scp = Expect->spawn("/usr/bin/scp ${srcpath}/$file $who:${destpath}/$file");
    $scp->expect(30,"ssword: ") || die "Never got password prompt from $dest:$!\n";
    print $scp 'password' . "\n";
    $scp->expect(30,"-re",'$\s') || die "Never got prompt from parent system:$!\n";
    $scp->soft_close();
    return;
}

Once you set up ssh-keygen as explained above, you can do

scp -i ~/.ssh/id_rsa /local/path/to/file [email protected]:/path/in/remote/server/

If you want to lessen typing each time, you can modify your .bash_profile file and put

alias remote_scp='scp -i ~/.ssh/id_rsa /local/path/to/file [email protected]:/path/in/remote/server/

Then from your terminal do source ~/.bash_profile. Afterwards if you type remote_scp in your terminal it should run the scp command without password.

An alternative would be add the public half of the user's key to the authorized-keys file on the target system. On the system you are initiating the transfer from, you can run an ssh-agent daemon and add the private half of the key to the agent. The batch job can then be configured to use the agent to get the private key, rather than prompting for the key's password.

This should be do-able on either a UNIX/Linux system or on Windows platform using pageant and pscp.

If you are connecting to the server from Windows, the Putty version of scp ("pscp") lets you pass the password with the -pw parameter.

This is mentioned in the documentation here.

curl can be used as a alternative to scp to copy a file and it supports a password on the commandline.

curl --insecure --user username:password -T /path/to/sourcefile sftp://desthost/path/

1. Make sure password authentication is enabled on the target server. If it runs Ubuntu, then open /etc/ssh/sshd_config on the server, find lines PasswordAuthentication=no and comment all them out (put # at the start of the line), save the file and run sudo systemctl restart ssh to apply the configuration. If there is no such line then you're done.
2. Add -o PreferredAuthentications="password" to your scp command, e.g.:

   scp -o PreferredAuthentications="password" /path/to/file user@server:/destination/directory
   

I found this really helpful answer here.

rsync -r -v --progress -e ssh user@remote-system:/address/to/remote/file /home/user/

Not only you can pass there the password, but also it will show the progress bar when copying. Really awesome.

1. make sure you have "expect" tool before, if not, do it

   # apt-get install expect

2. create the a script file with following content. (# vi /root/scriptfile)

   spawn scp /path_from/file_name user_name_here@to_host_name:/path_to

   expect "password:"

   send put_password_here\n;

   interact

3. execute the script file with "expect" tool

   # expect /root/scriptfile

just generate a ssh key like:

ssh-keygen -t rsa -C "[email protected]"

copy the content of ~/.ssh/id_rsa.pub and lastly add it to the remote machines ~/.ssh/authorized_keys

make sure remote machine have the permissions 0700 for ~./ssh folder and 0600 for ~/.ssh/authorized_keys

Here's a poor man's Linux/Python/Expect-like example based on this blog post: Upgrading simple shells to fully interactive TTYs. I needed this for old machines where I can't install Expect or add modules to Python.

Code:

(
    echo 'scp [email protected]:./install.sh .'
    sleep 5
    echo 'scp-passwd'
    sleep 5
    echo 'exit'
) |

python -c 'import pty; pty.spawn("/usr/bin/bash")'

Output:

scp [email protected]:install.sh .
bash-4.2$ scp [email protected]:install.sh .
Password: 
install.sh                                 100%   15KB 236.2KB/s   00:00    
bash-4.2$ exit
exit

steps to get sshpass For rhel/centos 6 :

# wget http://epel.mirror.net.in/epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
# yum install sshpass

source: https://community.mapr.com/thread/9040

You can use the 'expect' script on unix/terminal

For example create 'test.exp' :

#!/usr/bin/expect
        spawn scp  /usr/bin/file.txt root@<ServerLocation>:/home
        set pass "Your_Password"
        expect {
        password: {send "$pass\r"; exp_continue}
                  }

run the script

expect test.exp 

I hope that helps.

You may use ssh-copy-id to add ssh key:

$which ssh-copy-id #check whether it exists

If exists:

ssh-copy-id  "user@remote-system"

In case if you observe a strict host key check error then use -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null options.

The complete example is as follows sshpass -p "password" scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null [email protected]:/tmp/from/psoutput /tmp/to/psoutput

Use sshpass:

sshpass -p "password" scp -r [email protected]:/some/remote/path /some/local/path

or so the password does not show in the bash history

sshpass -f "/path/to/passwordfile" scp -r [email protected]:/some/remote/path /some/local/path

The above copies contents of path from the remote host to your local.

Install :

• ubuntu/debian
  • apt install sshpass
• centos/fedora
  • yum install sshpass
• mac w/ macports
  • port install sshpass
• mac w/ brew
  • brew install https://raw.githubusercontent.com/kadwanev/bigboybrew/master/Library/Formula/sshpass.rb