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Old 07-31-2012, 11:33 AM   #1
Registered: Jun 2012
Posts: 47

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Generate md5 password in a script

In my script i want to read a users input for what they want their grub password to be and store in $Password.

Then i need to generate a md5 hash from that password.

Usually you use grub-md5-crypt to generate the hash but that has prompts and i don't know how to handle that in a script. Is their some sort of function i can call and pass in my $Password variable as input?
Old 07-31-2012, 12:52 PM   #2
Registered: Apr 2002
Location: UK, Sywell, EGBK
Distribution: RHEL, SuSE, CentOS, Debian, Ubuntu
Posts: 60

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Try md5pass.
1 members found this post helpful.
Old 07-31-2012, 03:33 PM   #3
Registered: Jun 2012
Posts: 47

Original Poster
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I ended up getting both md5pass and grub-md5-crypt to work although i prefer the latter even though i don't understand the difference between the two yet.

My parse produces the expected result but it doesn't work in my kickstart for some weird reason.
I get error: A single argument is expected for the rootpw command

For the benefit of the community here is how i parsed it out:

rootHash="$(echo -e "$rootPass\n$rootPass" | grub-md5-crypt 2>/dev/null | tail --lines=1)"
echo -e "\nrootpw --iscrypted" $rootHash >> /tmp/Variables.cfg

to make sure i only get the hash i use 2>/dev/null to send the prompts "Type password" and "Retype password" into null oblivion

I use tail --lines=1 to grab the last thing in the line which happens to be the hash.

My initial question is solved though so i will mark this solved.


grub, kickstart, password

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