I am writing subroutine to generate a Linux compatible password for the
command useradd executed from within a Perl script, where useradd can be
supplied a compatible encrytped password as with crypt(3) generated
passwords. I need something like this:
my $ADD_USER="/usr/sbin/useradd -g users -G sshd -d /home/n_user -m -p
${crypt_user_pass} n_user";
The Perl function, crypt, needs a salt to generate a password, so to generate
the above variable ${crypt_user_pass} I have something like:
my $salt = substr($new_pass,0,2); # use first 2 chars of new password for salt
$crypt_user_pass = crypt($new_pass, $salt); # encrypt pass
Unfortunately the generated crypted password does allow access so is possibly
incorrect. It does not match that which is present in /etc/shadow if you
manually add a user.
Can anyone see where I'm going wrong? Does anyone have a working example they
can point me to?
Time to dig out Applied Cryptography too;)
Thanks, Damian
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