Login or Register to Ask a Question and Join Our Community

Sponsored Content
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) 
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

useradd

I work on some hp ux 11.00 Servers. i have to add an user. i use the useradd command like follows: useradd -u 72022 -g 71095 -c " comment " -d /PACKAGE_NAME/home/username -s /usr/bin/sh username The command returns with error 3. The manpage means value number 3: Invalid argument supplied to an... (6 Replies)
Discussion started by: ortsvorsteher
6 Replies

2. UNIX for Advanced & Expert Users

useradd

Hi. due to some needs i gave a user the premission to use useradd command with sudo. i want to know if there is a way to let him set the initial password, without giving him the premission to use passwd command as root (sudo). maybe a way to set a default password for all the new users that... (2 Replies)
Discussion started by: dorilevy
2 Replies

3. Solaris

useradd

Hi, I need to add a new user who will only be able to access one single folder on my Solaris 9 system. Can this be achieved by using just useradd or do i need to fiddle with auth_attr table? TIA, Selma (4 Replies)
Discussion started by: Selma
4 Replies

4. UNIX for Dummies Questions & Answers

useradd question

The man pages for useradd show the -k flag as a option, problem is I don't know what the description means. Could someone explain what "an alternative skel directory" is? Is skel an acronym? Thanks From the man page: -k, --skel skeldir Specify an alternative skel... (1 Reply)
Discussion started by: thumper
1 Replies

5. Shell Programming and Scripting

useradd

Gurus, I need to add a user to all the machines. I need a script to do this. I did one but it does not allow me to su to root within a ssh session i open. It exists saying su: Sorry. Please let me know how i can do it. I do not have the freedom of using sudo either. Regards (4 Replies)
Discussion started by: earlysame55
4 Replies

6. UNIX for Advanced & Expert Users

useradd?

Hi Experts, when using useradd command, what are the necessary options/arguments to be included? Please advice. (4 Replies)
Discussion started by: etcpasswd
4 Replies

7. Shell Programming and Scripting

Help with useradd script

Ok Im trying too make this shell script create users from my text file, I also want to type in a password for the new users. So thay can make a uniq one themself after first logon. #!/bin/sh # Sebastian schmidt clear echo "*************************************************************"... (3 Replies)
Discussion started by: chipmunken
3 Replies

8. Solaris

useradd

if useradd command is deleted in solaris how do we add user (3 Replies)
Discussion started by: vivek_ng
3 Replies

9. Solaris

useradd problem

:wall:i want to create a user in solaris whose password expires after every 30 minutes and he has to change his password after evry thirty minutes.How can we do that?:confused: thanx and regards, shekhar (17 Replies)
Discussion started by: shekhar_4_u
17 Replies

10. Solaris

useradd

I want to creat a 27 logins in solaris.Can anyone tell me how to write a script for that so that i create at a time for all 27 people. Thanks to guide me. (6 Replies)
Discussion started by: kkalyan
6 Replies

LEARN ABOUT LINUX

mkpasswd

MKPASSWD(1)							 Debian GNU/Linux						       MKPASSWD(1)

NAME

       mkpasswd - Overfeatured front end to crypt(3)

SYNOPSIS

       mkpasswd PASSWORD SALT

DESCRIPTION

       mkpasswd encrypts the given password with the crypt(3) libc function using the given salt.

OPTIONS

       -S, --salt=STRING
	      Use the STRING as salt. It must not contain prefixes such as $1$.

       -R, --rounds=NUMBER
	      Use  NUMBER  rounds. This argument is ignored if the method chosen does not support variable rounds. For the OpenBSD Blowfish method
	      this is the logarithm of the number of rounds.

       -m, --method=TYPE
	      Compute the password using the TYPE method.  If TYPE is help then the available methods are printed.

       -5     Like --method=md5.

       -P, --password-fd=NUM
	      Read the password from file descriptor NUM instead of using getpass(3).  If the file descriptor is not connected to a  tty  then	no
	      other message than the hashed password is printed on stdout.

       -s, --stdin
	      Like --password-fd=0.

ENVIRONMENT

       MKPASSWD_OPTIONS
	      A list of options which will be evalued before the ones specified on the command line.

BUGS

       If the --stdin option is used, passwords containing some control characters may not be read correctly.

       This programs suffers of a bad case of featuritis.

SEE ALSO

       passwd(1), passwd(5), crypt(3), getpass(3)

AUTHOR

       mkpasswd  and  this man page were written by Marco d'Itri <md@linux.it> and are licensed under the terms of the GNU General Public License,
       version 2 or higher.

Marco d'Itri							   21 March 2008						       MKPASSWD(1)
All times are GMT -4. The time now is 08:58 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy