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Top Forums Shell Programming and Scripting Script to change password in UNIX Post 302906179 by cnamejj on Tuesday 17th of June 2014 06:51:13 PM
Old 06-17-2014
If you have to do this, which is sounds like is the case, then I suggest you maintain the list of password as hashed/encrypted passwords. That's not hard since you are presumably generating them in advance manually. Once you have that you can change them with "usermod". The "-p" flag will let you pass in a hashed password.

Exposing hashed password strings in the process table isn't ideal, but they aren't usable as is. If someone found them out they would still have to crack the password before they could be used.

Check "man usermod" for the gory details.
 

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RADCRYPT(8)						      System Manager's Manual						       RADCRYPT(8)

NAME
radcrypt - generate password hash for use with radius, or validates a password hash SYNOPSIS
radcrypt [-d|--des] [-m|--md5] [-c|--check] plaintext_password [hashed_password] DESCRIPTION
radcrypt generates a hashed digest of a plaintext password, or can validate if a password hash matches a plaintext password. DES and MD5 hashes are currently supported. When generating a password hash a random salt is generated and applied. A hashed password can be validated by specifying -c or --check and passing hashed_password after plaintext_password on the command line. In this case hashed_password will be checked to see if it matches plaintext_password. If so "Password OK" will be printed and the exit sta- tus will be 1, otherwise "Password BAD" will be printed and exit status will be 0 (Note this is the opposite of a normal successful shell status). OPTIONS
-d --des Use a DES (Data Encryption Standard) hash (default). Ignored if performing a password check. -m --md5 Use a MD5 (Message Digest 5) hash. Ignored if performing a password check. -c --check Perform a validation check on a password hash to verify if it matches the plantext password. EXAMPLES
$ radcrypt foobar HaX0xn7Qy650Q $ radcrypt -c foobar HaX0xn7Qy650Q Password OK SEE ALSO
radiusd(8), crypt(3) AUTHORS
Miquel van Smoorenburg <miquels@cistron-office.nl> RADCRYPT(8)
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