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Old 12-24-2013, 11:04 AM   #1
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Registered: Jan 2006
Posts: 12

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Truecrypt and sudoers

Hello everyone,

Changes to the sudoers file seem to be ignored by Mint. The changes are made using visudo and the same line works in other distros. What happens is truecrypt requests the password for the encryption but then requests the user/administrator's password. This happens in Mint 15 Mate and KDE and Mint 16 KDE. In other distros only the encryption password is required.
None of these lines work:

%truecrypt ALL=(ALL) NOPASSWD: /usr/bin/truecrypt
%truecrypt ALL=(root) NOPASSWD: /usr/bin/truecrypt
username ALL=(ALL) NOPASSWD: /usr/bin/truecrypt
username ALL=(root) NOPASSWD: /usr/bin/truecrypt

Of course there is a group truecrypt with a user added.

Does anyone know why Mint ignores these additions to sudoers?

Old 12-25-2013, 09:00 AM   #2
Registered: Oct 2007
Distribution: Gentoo, Gentoo ~amd64, Linux Mint 17
Posts: 48

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The second time truecrypt asks password is because it mounts under /mnt (eg. /mnt/truecrypt1) for which only root has previlages.

I also use truecrypt (not used with Mint though) and this irritates me as well. But I had never bothered to work on it. Now that you have opened a thread asking for help, I would subscribe and see what others have to say.

I will not have access to my laptop so cannot test any of the suggestions. But there could be two possibilities.
1. there may be a setting in truecrypt's configuration. Take a look at it.
2. if we create a custom polkit authorization to let ordinary user to mount system internal partition, this problem may go.
Old 12-26-2013, 12:22 PM   #3
Registered: Oct 2007
Distribution: Gentoo, Gentoo ~amd64, Linux Mint 17
Posts: 48

Rep: Reputation: 9

I'm sorry truecrypt mounts under /media, not under /mnt as mentioned in my earlier post and no polkit authorization hacks required.

I installed truecrypt on this netbook with Mint 16 (Xfce) and changes to sudoers as you have tried works!

My entry in sudoers looks like this
TRUECRYPT ALL=(ALL)NOPASSWD:/usr/bin/truecrypt
where TRUECRYPT is a user alias to include all my usernames on this netbook.

This worked. Then I removed user alias line and put my username instead of TRUECRYPT, it still worked. I then put another user's username. This time I could not mount the truecrypt volume _as me_. But when I logged out and logged in as that other user, truecrypt mounting works just fine.

Don't know why it's not working for you. Just checking, did you exit truecrypt fully, launched again and tried? Also, I have 'never save history' checked.

Last edited by saivinoba; 12-26-2013 at 12:30 PM.
Old 12-27-2013, 08:50 AM   #4
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Registered: Jan 2006
Posts: 12

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That's odd. Perhaps the issue is just with the KDE versions of Mint. As I said in the op, this works perfectly in other distro KDE (PCLOS). I haven't tried other flavors of Mint.

Thanks for the input. Maybe someone can come up with the answer as to why it works in Mint XFCE and not in Mint KDE.


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