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Am 02.01.2012 12:36, schrieb Stéphane Guedon: |
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> On Monday 02 January 2012 11:49:11 Florian Philipp wrote: |
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>> Am 02.01.2012 09:07, schrieb Stéphane Guedon: |
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>>> Hi all |
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>>> |
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>>> I may ask something already discussed, but I can't find any good |
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>>> documentation. I am wondering of how to secure my home repository on my |
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>>> laptop. I am thinking of cryptography and other things (the password |
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>>> uncrypt the repository and allows to read files...). |
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>>> |
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>>> What tool to use for ? Anybody knows a good doc (in french would be |
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>>> really good) ? |
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>>> |
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>>> I am not really paranoïd, but I work now in a quite important |
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>>> environnement and want any data I get out to be secured... |
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>> |
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>> I recommend dm-crypt (a.k.a. cryptsetup-luks). It encrypts the block |
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>> device under the actual file system. Gentoo wiki has some tutorials on |
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>> it (although you don't need much of it): [1] [2] |
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>> |
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>> If you only want to encrypt your home partition, you only need to follow |
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>> these steps: |
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>> |
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>> 1. Create an encrypted partition (see `man cryptsetup`) |
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>> 2. Move /home/* over to it (don't forget backup) |
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>> 3. Configure /etc/conf.d/dmcrypt |
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>> 4. Add /etc/init.d/dmcrypt to boot runlevel |
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>> |
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>> Then the init script will ask you for the password at boot. dm-crypt |
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>> allows multiple passwords per partition so that different users can have |
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>> different passwords. |
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>> |
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>> The alternative to the dmcrypt init script is to use sys-auth/pam_mount. |
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>> It allows you to use the login password to automatically decrypt a |
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>> partition and mount it as /home/$user. [2] has a section about it. |
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>> However, this breaks easily and is pretty hard to administrate if you |
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>> have no experience with dm-crypt and pam. I recommend the first solution. |
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>> |
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>> [1] |
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>> http://en.gentoo-wiki.com/wiki/SECURITY_System_Encryption_DM-Crypt_with_LUK |
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>> S [2] http://en.gentoo-wiki.com/wiki/DM-Crypt |
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>> |
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>> Regards, |
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>> Florian Philipp |
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> |
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> Is this solution (the first one) easily integrated into some environnement |
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> (kde) ? |
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> |
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> I don't want to have numerous password (one for decrypt, one other to open the |
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> desktop session as usual...), plus my wife would argue with some reason I am |
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> always hacking the computer whereas we are just using it to look movies... |
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> (she uses the computer also, but in a much more used way, so any solution has |
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> to be comfortable to her too !) |
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> |
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|
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Well, it is partially integrated: When it is not /home/* but some other |
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partition/external disk, then KDE supports decrypting it when you mount |
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it (like memory sticks). It can also save the password in kwallet. Gnome |
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can do the same. However, if you want to use it for /home/* and don't |
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want to enter the password twice, you should use pam_mount. |
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|
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One alternative: the dmcrypt init script also supports key files. I |
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believe it is possible to put a key file on an USB stick and the init |
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script waits until the stick is attached, then mounts it and uses the |
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file to decrypt the partition. It's a poor man's smartcard, just without |
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a PIN. |
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That way, you don't need to enter the password, just take care of that |
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stick. You can also encrypt the key file with GPG, but then you need to |
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enter the password for that file. |
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|
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Regards, |
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Florian Philipp |
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