1. For remote password changes, you'll need sudo rights on the remote.
2. Ensure sudo is configured for remote root commands.
a. Edit /etc/sudoers with visudo
b. comment out the following:
#Defaults requiretty
#Defaults !visiblepw
3. Generate a new password for the user using this simple perl thingie:
Example:
[doomicon@songohan tools]$ ./genpass.pl password
$1$m/Ba1kqd$LXQxR..lqUwgWE5kSPESF0
#!/usr/bin/perl
#
# usage: genpass.pl '<password>'
# Generate MD5 encrypt string for remote useradd/usermod
# rowens
#"THE BEER-WARE LICENSE" (Revision 42):
# <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
# can do whatever you want with this stuff. If we meet some day, and you think
# this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
use Crypt::PasswdMD5;
my @salt = ( '.', '/', 0 .. 9, 'A' .. 'Z', 'a' .. 'z' );
$newpass="$ARGV[0]";
sub gensalt {
my $count = shift;
my $salt;
for (1..$count) {
$salt .= (@salt)[rand @salt];
}
return $salt;
}
$encryptpass = unix_md5_crypt( $newpass, gensalt(8) );
printf "$encryptpass\n";
4. Using the password just generated, we'll use the nifty '-p' option for usermod.
ssh remote_host sudo /usr/sbin/usermod -p '$1$m/Ba1kqd$LXQxR..lqUwgWE5kSPESF0' remoteuser
If you have to change this user on multiple hosts, just loop it.
for host in `grep -v ^127 /etc/hosts | awk '{ print $1 }'`
do
ssh $host sudo /usr/sbin/usermod -p '$1$m/Ba1kqd$LXQxR..lqUwgWE5kSPESF0' user
done
Fin
