Since you state that when you manually ssh you are not asked for a username/password, it sounds as if you are logging in with the same username as on the local machine with a public key pair. In that case, in place of the login() call you may do something like this:

# $wait_time previously defined, in seconds
# $password previously defined
if ( ! $ssh->run_ssh() ) {
    if ( $ssh->waitfor( "ontinue connecting", $wait_time ) ) {
        $ssh->send("yes");
    }
    if ( $ssh->waitfor( "ssword", $wait_time ) ) {
        $ssh->send( $password );
    }
    if ( $ssh->waitfor( "ast login", $wait_time ) ) {
        # logged in
    }
    else {
        # unexpected error
        return undef;
    }
}
# connected, continue on your way
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Hope that helps.

Update: 2015-10-07
Changed variable name to make snippet more readable.