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Full Discussion: Useradd issue
Operating Systems Linux Red Hat Useradd issue Post 302410405 by m1xram on Tuesday 6th of April 2010 01:24:17 AM
Old 04-06-2010
Perl crypt()
See perldoc -f crypt.
Quote:
crypt PLAINTEXT, SALT
Where PLAINTEXT is the password in this case
Where SALT is a two character string, matches regexp /[./0-9A-Za-z]{2}/
Many people use seconds to come up with a SALT string but in a tight loop you may pull the the same second. Do something with this...
Code:
sub fractime () {
  use Time::HiRes qw ( time );
  my $now = time;
  $now -= int($now);
  return $now;
}

That will give you a factional time where you can use string operators to suck out two digits at a time and the modulo them to the set of 64 characters available for the SALT with...
Code:
sub randsalt($) {
  my ($fractime) = @_;

  my $saltset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789./';
  my $salt = "";
  for (my $i = 0; $i < 2; ++$i) {
    my $s = substr($fractime, ($i * 2) + 2, 2) % length($saltset);
    $salt .= substr($saltset, $s, 1);
  }
  return $salt;
}

So we call these two functions in Perl and return the password.
Code:
my $ft = fractime();
#print $ft, "\n";
my $salt = randsalt($ft);
#print $salt, "\n";
print crypt($ARGV[0], $salt), "\n";

See attachment for Perl code and remember to 'chmod' it. We can now get the proper password in BASH with...
Code:
#!/bin/bash
PASS=$(./test8.pl somepassword)

I tested the 'useradd' command and it worked correctly with adding the account under Fedora12. Sorry for the hedge bet but the documentation says the default '-p' option is to disable the account? This sounds strange.

Good Luck.
test8.pl (601 Bytes) 
 

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LEARN ABOUT CENTOS

spacewalk-channel

SPACEWALK-CHANNEL(8)						   Red Hat, Inc.					      SPACEWALK-CHANNEL(8)

NAME

       spacewalk-channel - Subscribe to or unsubscribe system from channel.

SYNOPSIS

       spacewalk-channel [options]

DESCRIPTION

       spacewalk-channel  allows  you  to  subscribe  to  and  unsubscribe from specified channels via the command line. A visit to the "Spacewalk
       Server", "Red Hat Satellite" or "Red Hat Network Classic" website isn't required.

OPTIONS

       -l, --list
	      Print a list of channel(s) that you are currently subscribed to.

       -b, --base
	      Print a base channel that you are currently subscribed to.

       -L, --available-channels
	      Print a list of all available child channels.

       -a, --add
	      You are subscribing system to given channel(s). You have to specify --user and --password.

       -r, --remove
	      You are unsubscribing system to given channel(s). You have to specify --user and --password.

       -u, --user
	      Your username used to register the system with and for Red Hat Network Classic, Red Hat Satellite or Spacewalk.  If you do not enter
	      this option and it is required, you will be prompted.

       -p, --password
	      The  password  associated  with the username specified with the --user option. This is an unencrypted password.  If you do not enter
	      this option and it is required, you will be prompted.

       -c, --channel
	      Label of channel you want to subscribe to or unsubscribe from. Can be specified multiple times.

       -v, --verbose
	      Print out successfull action.

       -h, --help
	      Show a help message and exit.

NOTE

       The addition and removal of channels is mutually exclusive, please use the command twice.

EXAMPLES

       Subscribe to two channels:

	      spacewalk-channel --add -c rhn-tools-rhel-i386-server-5 -c rhel-i386-server-vt-5 --user username --password password

       Unsubscribe from channel:

	      spacewalk-channel --remove -c rhn-tools-rhel-i386-server-5 -c rhel-i386-server-vt-5 --user username --password password

       List subscribed channels:

	      spacewalk-channel --list

SEE ALSO

       rhnplugin(8), rhn_register(8), up2date(5).

AUTHORS

       Miroslav Suchy <msuchy@redhat.com>

BUGS

       Report bugs to <http://bugzilla.redhat.com>.

COPYRIGHT

       Copyright (C) 2009-2010 Red Hat, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

Linux								  2010 August 30					      SPACEWALK-CHANNEL(8)
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