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how to redirect stdout for htpasswd in script

Posted on 2004-11-08
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Last Modified: 2013-12-15

Hi:

I've got an htpasswd authentication file that needs to be updated with the usernames and passwords from a database every day.

I've written a cron script that gets the values of the database and then calls htpasswd to update the authentication file.  The output from the cron job gets emailed to me every day - usually, just a lot of "Updating password for user **username**" lines.  I'd rather only get the cron email if there's a problem - a missing password or something.

My first thought was to just redirect stdout to /dev/null in the crontab, like this:

0 19 * * * /usr/bin/perl /home/user/bin/scripname.pl >/dev/null

but it doesn't seem to work.   I still get the output from the htpasswd command emailed to me.  Is it getting printed on stderr?  if so, I don't want to redirect stderr to /dev/null because then I'll miss any errors that occur.

Am I doing anything wrong?  Anyone had any experience like this?

-Charlie
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Question by:gothamww
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jlevie earned 500 total points
ID: 12526876
> Is it getting printed on stderr?

Yes.

Since you are using perl to update the auth file why not directly manuipulate the file with the Perl script. It is pretty easy to generate the encrypted password within Perl. For DES encrypted passwords you can use:

sub descrypt()
{
  my($pw) = @_;
  $salts  = "0123456789";
  $salts .= "abcdefghijklmnopqrstuvwxyz";
  $salts .= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  $nsalts = length($salts);
                                                                                               
  $i = int(rand $nsalts);
  $ii = int(rand $nsalts);
  $salt = substr($salts, $i, 1).substr($salts, $ii, 1);
  $epw = crypt($pw, $salt);
  return($epw);
}

which is used like:

$epw = descrypt($passwd);

$passwd holds the plain text password and $epw the DES encrypted result.
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Author Comment

by:gothamww
ID: 12528059

so, the authentication file that htpasswd generates is just an ordinary text file that can be edited by any means, as long as the password is "DES" encrypted and each record is in the format:

username:DESencpasswd
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Expert Comment

by:jlevie
ID: 12528318
Yep, assuming that you are using the flat file rather than a DB. If that's the case you can use any text editor to examine the auth file to see what it looks like. On a Linux system the encrypted passwords in the auth file can be encrypted with DES or MD5. The format of the encrypted password will auto-select the correct encryption method. See 'man 3 crypt' for details.
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Author Comment

by:gothamww
ID: 12528570
Thanks a lot jlevie
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