Ubuntu Security :: All Of /home Is Gone?
Jul 24, 2010
I started getting some sort of error when I logged in saying "Could not update ICEauthority file." I tried to solve this problem myself by Googleing around and I ran across a message that said to type the following command if /home is encrypted:
Code:
sudo chomd 700 /home/danny
I did that and when I logged in I noticed that everything in /home was gone! I think it is still there somewhere because there still seems to be about 500gb of hard drive space that something seems to be filling. It must be my old profile, right?
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Jun 15, 2010
I have read that to improve security in Ubuntu a good fix is to make the /home folder tree non-executable by default. This would mean that malware could not run in the /home tree without changing the setup.Is this a viable change, or is it just icing on the cake, any one any thoughts on this.
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Jan 29, 2010
how i can remote access my pc at home from work ? on different pc that has access to INTERNET. what software shall I install on my pc at home ? I want to be able to install software on my pc at home from my work place, my home pc has unbuntu Linux ubuntu 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux
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Mar 15, 2010
During the installation of Ubuntu Karmic, I picked the option that encrypts my home directory.
A few questions:
(1) Shortly after installation, I was asked to run a command to print a key necessary for data recovery from a rescue CD. I didn't run it at the time and am now looking for the command to run. What is it?
(2) I think I read somewhere that this also encrypts swap. Great. Correct me if that's wrong.
(3) If I suspend the machine, is my home directory encrypted? That is, if I have this on a laptop and travel with the suspended laptop and someone steals it, are my data safe, or not?
(4) I assume the weakest point in the system is my relatively short login password (but I think the install tests it and found it okay). Is there a recommendation how long this should be?
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May 4, 2010
I have my home partition encrypted and would like to take the decryption out of the system. Such as when booting the PC it would say it can't find the keys so stop and wait for me to put my usb drive in to continue (reboot and try again). Is there some way to get something like this set up?
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May 11, 2010
I'm using lucid desktop edition, and I need to encrypt my home folder, but I didn't mark that option in the fresh instalation of lucid. I'd like the login screen to ask for the password and then decrypt my files.Is it possible to do without erasing my user?
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Dec 1, 2010
I installed Ubuntu 10.04 only be dismayed to find ${HOME}/bin FIRST IN THE PATH. I blogged about it at my blog (I sudo an xterm rather than just sudoing to get a different background for the sudo'd xterm): [url]
I agree that some new user should probably not be logging on as root. But if the replacement for 'ls' is in their ${HOME}/bin/ the sudo'd shell inherits the same PATH, umask, and everything else! In general I take a dim view of a sudo only way of doing things. It seems to cause more problems than it solves for disciplined, knowledgeable users. In the case of Ubuntu it caused me to create a /root folder for root to reset the umask back from 077 which is what I use over to 022 which is what root should use. The /root/.profile of course made sure there is no /home/me/bin in the sudo'd PATH. It didn't matter because somebody is not just SETTING the file perms and is instead calculating them based off of modifications to the umask. JUST SET THEM! I ran into a problem with GRUB getting things fouled up because I was having to remove the new kernels and instead of using the command line option (much prefereable) used Synaptic Manager instead: [url]
In fhe case of an infection living in a user's file space you really should want to go in to clean it out as some other user than the user that is infected. Having said that the hackers seem to be going for the whole enchilada right off the bat. A WARNING is in order here. DO NOT USE A ROOT ACCOUNT OR SUDO FOR NORMAL TASKS! But please put ${HOME}/bin last in the PATH or preferably don't even put it in the PATH at all. Let users add it themselves if they want it. Also once hackers figure out that hijacking a sudo tty (from what I just read else-where here I would say several hackers are working on doing that right now - sendmail my ****) is a dandy way of doing things you really will need to provide for ways of cleaning a user infestation out by going at it some other way than through that infected user. A lot of Ubuntu users have only one login account, the one they created when they set the machine up.
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Feb 11, 2010
I have just installed Ubuntu Jaunty (I do not like Karmic, please don't try to make me upgrade) and after installing all my programs I realized I did not encrypt my home directory.
I know it's very simple to do this during the installation but I can't seem to find an option to do it after it.
Is there a way to do this?
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Mar 9, 2010
I just installed 9.10 on my laptop and selected the option for home folder encryption. I am running DropBox and placed the DropBox folder on my desktop (meaning it should be encrypted when I am logged out.) So I have two questions:
1) Shouldn't this setup cause my DropBox files on the server to be encrypted? Apparently they are not because they appear as unencrypted text using the DropBox Web interface.
2) If they were encrypted on the server (which doesn't appear to be the case right now), how would it be possible to share them with another client unless the encryption on both clients were set up identically?
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Apr 10, 2010
I recently installed Ubuntu Linux and did not encrypt the home directory during the install. Now I want to encrypt my home directory, or even better the whole hard drive.
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Apr 26, 2010
While setting up my laptop on a new hard drive (a bad mobo caused writes which pretty much rendered teh old hdd unusable) I was asked if I wanted to encrypt my home partition.
I've been wanting this for several years - even going as far as trying to get a copy of CheckPoint. That's waht my organization uses on all Wintendo laptops and is required.
In any case, I said "yes" and am happily using my laptop with an encrypted home partition. I'm assuming based on this - [URL] - that it is using EncryptFS as the scheme.
if I were to misplace my laptop, how easy would it be for a forensics team to retrieve my data. Let's assume I have a fairly strong passphrase, such as BisZumBitterenEnd3. [URL]
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May 3, 2010
When I installed, I selected the option to encrypt my home folder. I believe this is causing constant crashes now, since error message is user id/password related. Is there a way to remove the encryption?
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May 3, 2010
I had some major problems after the recent Ubuntu upgrade and had to boot from a live cd. I have a separate /home partition, but it was encrypted using the default install encryption in the 9.10 install cd. How can I get to my files so I can back them up?
I have tried this but it did not work: http://ubuntuforums.org/showthread.php?t=1337693
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May 5, 2010
I have a major major issue with an encrypted /home directory. I had used encryption on my home directory when I installed 9.10. However, I had not noticed that I needed to store the automatically generated passphrase anywhere. Now, upon installing 10.04, my home directory would not decrypt. I checked my .encryptfs directory and the wrapped-passphrase file is GONE. I only have the Private.sig files from my 9.10 installation and of course know the login password I binded to the passphrase. I can see my .Private directory with filenames starting with ECRYPTFS_FNEC_ENCRYPTED. Now, my PhD thesis which I have to deliver in 2 weeks is in there. With no backups. How to recover my data. If no 'normal' method would work, is it possible to use a brute force attack and feed it my login password?
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Jun 11, 2010
I'm using 10.04 with encrypted home dir. I think the behavior below is wrong:
I can log in as root and change user's password. After that the user can log in using new password, which is normal, but it can also decrypt its home dir using the new password, which is dangerous. Assume I lost my computer. This encrypted home dir will not protect my private data because whoever gets the computer can boot it up with a livecd and chroot to change my user's password and then boot up my system and log in using new password.
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Jul 19, 2010
Let's begin from the top. I have a relatively new laptop that I've been running Ubuntu on (along with a little-used Windows boot). Picked it up in November or so, installed the current "latest" version of Ubuntu at the time (9.10). I have been doing incremental upgrades, and it's been progressively breaking down more and more. Yes, this includes 10.04.
After GRUB stopped working, I decided it was time to try a reinstall from the top. I told it to leave all the other operating systems alone and do a full reinstall.
Fortunately, I had managed to stuff most of my current work in duplicate locations during this whole debacle, somehow. Don't ask me how I managed to do that when GRUB wasn't working. However, when I installed, I conscientiously said "Oh, yes, Ubuntu, encrypt my home folder! I love privacy!" As a result, about... 30 gigabytes of useful (but ultimately re-downloadable) material is rather inaccessible at the moment. When I try to boot the old system using the newly fixed GRUB, it goes into kernel panic. This seems like a no-go.
I have a saved hojillion-character long passphrase for decryption from my install back in November. Conscientiously saved in the case of just such an emergency.
I read this how-to and followed it to the letter as far as I could tell, trying to mount with ecrytfs to recover my data.
[USERNAME] here is a proxy for my actual username. Yes, the location of my old home folder may seem a little bizarre.
Code:
sudo mount -t ecryptfs /media/c82ca9fe-2b15-4aca-a98d-6482b1d80a32/home/[USERNAME]/ /home/[USERNAME]/oldhome
Passphrase:
Select cipher:
1) aes: blocksize = 16; min keysize = 16; max keysize = 32 (not loaded)
[Code].....
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Jul 22, 2010
I've been studying air crack so that i can learn ways to improve my home wireless network and using air crack on ubuntu isn't as easy as i thought it would be.
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Oct 23, 2010
So for ive changed the dns on my home router to Opendns and ive added this What does a dns attack look like? how would i know is my dns was poisoned or if i was under a kaminsky style attack?
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Nov 13, 2010
I've just reinstalled my box with an encrypted home (used the encrypt home option when installing). I have a query in this regard - suppose I lose the box. Won't it be possible for someone to drop into root, reset my passwd and then access my /home. Is there anyway of having a different passwd for accessing /home? My ~ is on a different partition from /.
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Nov 30, 2010
lets say I install Ubuntu 10.10 on my laptop. I check the box that says encrypt my home directory, and my password is a randomly generated 10 character password using uppercase and lowercase letters and numbers. The next day my laptop gets stolen or something. How hard would it be for someone to decrypt the home directory if that were the goal?
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Mar 9, 2011
I need to do a reinstall (read the details here): http://ubuntuforums.org/showthread.php?t=1703381 but I need to be able to access my home directory which is encrypted. Is there a way to decrypt my home folder, so that I don't get into trouble accessing it later on?
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Jun 10, 2011
Is there any good NVR software available to use with my network cam as a home grown security solution?I have tried Zoneminder but for some unknown reasons it doesn't work for me.
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Jun 12, 2011
I have Kubuntu 11.04 64-bit installed (software upgrade from 10.10) and I have a separate /home partition. I want to encrypt my /home partition (and perhaps the swap partition as well) but I don't want to have to reinstall Kubuntu. (Mostly because it was a software upgrade and I don't have an 11.04 disc.) I found a tutorial for Encryptfs via one of the stickies that mentions post-install migration, but it says that using Encryptfs on a separate /home partition is more complicated than if it were part of the root partition and that the CDs don't have any software to preserve and configure existing encrypted /home partitions. (Granted this tutorial is made for 9.04, so things may have changed.)
Also, this tutorial makes it sound like if you have your /home directory encrypted that the encrypted data is stored in a folder on the root partition. Is it done the same way if the /home directory is on its own partition? Because I don't think my root partition is large enough to have all of my /home data. (I purposely kept it small because the root partition doesn't seem to get very large.)
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Aug 23, 2011
I had a student, and she has done some work on her account on my lab computer, but has left the country and is un-contactable.
I have full administrator privileges for this machine, and it is running Ubuntu LTS 10.04
She has a folder which was copied from a windows formatted external hard drive (Probably NTFS) onto her home partition on my machine.
I can open all of her files, except for those in this folder.
As I see it the problem is either something to do with the permissions of the files (coming from NTFS), or some kind of Ubuntu security that I am unaware of?
Here are my attempts to open it code...
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Mar 20, 2010
When installing the latest Distro of Mint (I believe this is not much different, if at all, from Ubuntu as far as this goes) I chose to have my Home folder encrypted using the login password. This was a function of the installation. What I was wondering about was how secure this was and if I should maybe use something to do a better encryption or not.
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Apr 11, 2010
What are the steps I must take to move my existing home folder to a separate, encrypted partition? Can I create this partition without damaging my current partition? Where is a trusted location to download App Armor profiles? What else can I do to harden the security of Ubuntu?
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May 9, 2010
I was reading a magazine article today which was a discussion of internet detective work for tracking down ip addresses which attempt an ssh login to your machine. I have never really paid much attention to network security since I only run a small home network. I have WPA encryption and a firewall on my router. But while reading this article, I remembered that I myself has seen log files in the past that inidicated someone somewhere had attempted to log into my machine (attempts all failed). This had happened a few times, but I never really considered it a threat.
But, the more I read about home computers becoming "zombies" for criminals, I guess I am getting a little paranoid in my old age, particularly since my wife does quite a bit of business on the net with credit cards. I have four computers connected to the net and each other on this network, and would like to be able to easily detect attempted log ins and deal with them quickly.
So my reason for posting is to ask if someone could recommend a novice-friendly application for monitoring traffic to check this intermittently. I have read bodhi.zazen's excellent tutorial on snort, but I it appears to be written for large lan's or web servers and is over-kill for a small home network.
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Jun 5, 2010
Is there a way to encrypt existing home directories in lucid so that they will unlock with pam-encfs when the user logs in? Or must you do this when the directory is created?
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Jun 29, 2010
last week I decided to not just run dist-upgrade, but give the Lynx a completely fresh install. Before that I've only copied my home folder to an external hard-drive.
Now that I'm on Ubuntu 10.04 I have no clue how to import my old personal key and the passwords from the backup (my old home folder).
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Jul 20, 2010
I want to carry Ubuntu with me everywhere on a LiveUSB but I want to encrypt the home with a strong passphrase in case it is lost or stolen. How do I do that?
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