Ubuntu Security :: Encrypting Swap Space Breaks Standby/lock Screen?
Jan 7, 2010
As part of making a encrypted private folder i told encfs to encrypt swap space on my pc knowing that this would probably break sleep and hibernation. That said i just turned on ubuntu for 5 mins, had to go away for a bit, when i came back to unlock the screen my password was not being accepted, and another 5 mins later the screen said that my session had timed out-i had to do a cold reboot Does this mean i cant lock the screen anymore?
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Aug 10, 2011
I would like to encrypt my swap partition ...During installation, I tried to select the "encrypt partition" choice, but it needed a passphrase.After installation, I tried to encrypt my partition ... I followed this article: The problem is that my swap partition always changes its path ...When I first booted the system, it was /dev/sda10, next it became /dev/sdc10, now it is /dev/sdb10. This is probably the reason why in fstab all entries are according to UUID.However, the swap partition is not fond of UUIDs ! I tried to mkswap /dev/<current swap partition> -L Swap, I received a UUID, puted it in /etc/crypttab ... it worked for the first time ... but the second time... did not.
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Dec 7, 2010
Lucid on an Acer Travelmate800.Can anyone tell me why I have 0k for swap space? I allocated swap which I can see in my Disk Utility's 'volumes' display.
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Mar 12, 2010
Is there anyway to make the lock screen password (accesible when clicking the power icon) different from the username password ?Or to lock the screen, with a different, User defined password, seperate to the Default one ?
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Aug 30, 2010
Is there a way to set Linux to automatically log in to a specific user account and at the same time lock the screen? I want to save time and trigger various software that always should start up on boot, while leaving the computer unattended during startup (extra important and practical for remote control boots), by enforcing a 'screen lock' so that no-one can see what happens behind the login screen without entering the login credentials.
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Apr 5, 2010
When i log in as root, and try to click the lock screen button, lock screen doesnt work? Is it disabled by default?is there anyway to lock screen when logged in as root
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Jul 6, 2011
Is there a way to set Linux to automatically log in to a specific user account and at the same time lock the screen? I want to save time and trigger various software that always should start up on boot, while leaving the computer unattended during startup (extra important and practical for remote control boots), by enforcing a 'screen lock' so that no-one can see what happens behind the login screen without entering the login credentials.
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Oct 29, 2010
I have an Ubuntu 10.04.1 LTS server that I set up a while back and I am considering encrypting the whole box. I store everything on the server and if it were stolen from a home robbery it could be quite devastating. The server is using two 750 GB SATA hard drives formatted with LVM. Inside the LVM I have a small partition on the first drive for the OS, SWAP, and everything else on the first and second drive is /var/media which is where I store all the data. I have set up an encrypted LVM on my laptop but that was during the install using the automatic method.
I can't figure out how to do what I want to do and I don't want to risk destroying the data on the server. What I would like is to non-destructively encrypt the server (System, SWAP, and DATA partitions) similar to how TrueCrypt works on Windows and I'd like the encryption key to be stored on a USB thumb drive so when the server boots it requires a hardware key. (And have the encryption key backed up online in case the flash drive dies.) And I'd like to use AES 256.
Code:
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Jun 10, 2010
why the following doesn't work with ext3 or 4?
dd if=/dev/urandom of=/tmp/container.bin bs=1024 count=20000
sudo losetup /dev/loop2 /tmp/container.bin
sudo cryptsetup -c aes -s 256 --verify-passphrase luksFormat /dev/loop2[code].........
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Jun 24, 2010
We use a squid proxy server for all http traffic. Is there any way to configure squid so that all traffic which squid and workstation communicates is SSL and encrypted ?
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Mar 6, 2010
I currently have my home folder encrypted with 128 bit encfs but i have the back up of that 'in the clear' on my back up hard drive. I am not that great with complicated instructions and especially the terminal so what if any is the easiest program to encrypt with?
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Jun 1, 2010
What is the easiest way to encrypt plain text content with a password only? I need to encrypt client login information, but I hate dealing with all the unnecessary complexities of Linux's encryption systems.
I know I am going to get a bunch of people telling me how perfect Seahorse and whatever is, but Seahorse and the default /home directly encryption have both given me too many problems when decrypting my information. I prefer to preserve my data rather than using these methods.
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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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Jun 27, 2010
Running Ubuntu 10.04 on a dual-boot Windows 7 laptop.
On "suspend," the wireless card appears to close connections correctly. Then, >15 minutes later, the laptop's wifi LED lights up and the laptop generates heat.
The computer should be on standby, but instead it's waking itself up and running down the battery.
Are there any programs that might be failing to suspend for sleep? Are there any settings to prevent the wifi card from waking the computer?
I only noticed this because the laptop was getting hot and the battery was wearing down.
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Jun 17, 2009
i have recently installed thunderbird on my fedora 11 box and so far so good. i am interested in encrypting my emails and digitally signing them as well. does anyone have documentation as to how i can do this? i messed around with it last night but i was not able to import a valid certificate.
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Dec 12, 2009
I'm installing fedora 12 on a laptop using the live cd, and I have a few questions about the encryption process.
First, I'd like to fill the drive with random data. I've read the fedora documentation and it suggests using the following command: dd if=/dev/urandom of=<device>. The installer didn't offer an opportunity to do this, so I opened a terminal and typed the command. I expected it to take hours on my 160 gig hard drive, but it only took about 3 minutes, and indicated about 600 megs of data had been written. Did I do it correctly? According to palimpsest, my boot partition is sda1 and the other partition is sda2, so that's the one ran the command with.
Second, I need some advice on what to encrypt. The installer shows me the following layout after I select encryption:
LVM Volume Groups
Hard Drives
I know I can't encrypt boot, but I can encrypt lv_root and lv_swap. But is it necessary to do that? And tell me the pros and cons of using a boot loader password?
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Oct 21, 2010
I encrypted my hard drive on my media PC but it's really annoying having to type in a password every time I turn it on. I chose a short password so it was quick and easy to type in but is it worth encrypting data with a weak password?If the computer is suspended, someone could come along and resume the computer. They would be presented with a locked GNOME session) but the data would be unencrypted; does this go against encrypting the hard drive? Or does the locked GNOME session provide enough security to keep an intruder out?
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Apr 14, 2010
This is probably really a quick fix but I cannot seem to find it. When I close my laptop lid it brings me to the standby screen which then asks me to put my password in, when i log in I managed to make it not ask me for a password but on the standby screen it still does.
It's just annoying me a little and wouldnt mind just being able to open my laptop and go. also same kinda problem with installing software, always asking for passwords but I guess i can live with that one.
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Feb 18, 2010
When the computer is in standby i press the power button and it whirrs into life but the screen stays blank and the power light stays orange.
Only way to sort it is to turn it off then on again.
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Mar 21, 2010
Am currently using 8.10 (xubuntu). The machine's "issue" (I've searched for a reference, but the one I found was a forum thread with no answers) is that when the display is set to go to sleep after 8 minutes of idleness in the power manager, it projects a black screen instead.
I'm not sure what different 'power saving modes' a display/OS usually has, but in Windows, when set to 'go to sleep' the screen goes into standby, i.e something like 'no signal', and from what I've read a lot more power is saved in that mode than by simply showing a black screen.
It was the same when I was running 8.04 with a different graphics card, if that matters. Haven't been able to try a different display. Screensaver and timing and resume normal video out works ok.
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May 1, 2010
Plenty of people seem to be having issues with the nvidia graphics drivers, so I thought I'd add my woes to the heap. My issue is that I run two screens under twinview, but the second one doesn't work for some reason. More specifically, the Nvidia-settings tool is able to detect my second monitor, and I'm able to assign it a resolution and position and the like, and my desktop seems to extend over to where the second monitor is, but the monitor just remains in standby mode.
This happened with the drivers proprietary drivers that Nvidia tried to install (version 173 I believe) so I removed them and tried to install the 195 drivers manually, which I eventually figured out how to do (by blacklisting the nouveau module amongst other things). This still didn't fix things, and gave me the same issue.
(As an aside, where can I find the nvidia-glx-195 and nvidia-modaliases-195 packages, as they seem to have disappeared from the LP-PPA-nvidia-vdpau repository where they apparently used to be?)
The strange part though, is that my second screen works fine if I don't install any nvidia drivers, and just use the System->Preferences->Monitors applet. The second screen comes out of standby and works nicely.
One other little thing I've noticed that may have something to do with it, is that if I switch the outputs that the monitors are connected to, the other monitor will work. The output whose monitor doesn't work is always the one that has the DVI->VGA converter. Could this have something to do with it?
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Jun 8, 2010
When I put my laptop to sleep (clamshell close) it goes to sleep and is a happy laptop.
When I open the laptop, I can hear the thing going and waking up. However the screen stays off. Brightness keys do nothing. (however they did nothing in the first place as I'm using the NVIDIA driver). I have to do a hard reset to fix things.
The strange thing about this is Sleeping / Waking up has never been an issue till about today.
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Mar 9, 2011
Has anyone tried encrypting the boot partition to prevent the kernel from being modified. Iv tried following this but I'm running into issues when building. [URL] Im using the source from bzr checkout [URL] Last time I tried I screwed grub and it wouldnt boot.
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Jan 3, 2010
I have experienced that the button in my main menu "Lock Screen" does nothing, so I can not lock my screen. What could be the problem? Is there any command in terminal what I could write, so I can see is there an error output or something?
I am using Ubuntu 9.10, GNOME.
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Jun 9, 2010
I'm running fedora 13 on a Dell Latitude E6500. It's a dual 64-bit system.
It was working, but then I tried to swap caps lock and control.
I used:
System->Preferences->Keyboard
Layouts->USA->Options
Then, under Control Key Position, I selected swap caps lock and control.
Now, my keyboard won't work in the Keyboard Preferences test area or in any other window or when the screen-lock comes on.
I tried logging out. I tried rebooting. I tried deleting my .gnome2 directory. Nothing seems to work. I can use the keyboard on other accounts, so the keyboard is not the problem.
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Feb 3, 2010
When i first installed ubuntu about 2 weeks i left about 30gb left for windows vista. I have not used vista at all so i decided to delete it and use the whole hard drive for ubuntu. I got the liveCD out and went into the partition editor on that (i had ubuntu,swap,vista in that order) and deleted the swap space and vista and increased the size of the Ubuntu partition to so there was only 4gb left for swap. I then booted up again from the hard drive and i get this message "one or mounts cannot be mounted" or something to that effect and it talks about the swap partition and offers to boot in recovery mode which does work.Once in recovery mode i go in and try and make swap partition with Disk Utility and i do that and it works. I go to restart Ubuntu to test it out and the same problem happens again, cannot mount swap ect. so i go back into Disk Utility and it now says 4gb Unrecognized instead of swap
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Oct 13, 2009
a friend of mine recently installed Ubuntu in his Laptop however is running really slow. It's Dell 1520 so I don't think the computer is that slow. I think what the problem is that he doesn't have a swap space. ok, I could use GPARTED to resize the HD and create SWAP space but how can I tell the system to permanently use that space?
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Mar 10, 2009
I had just installed gparted , not used yet.I have a problem , at the time of installation i havent created necessary swap space , my linux partition contains 30GB with ext2 filesystem..I'm fully having this , but my question is with the above mentioned tool can I recreate swap space from this 30GB , like 20GB as user space and rest 10 as swap space . Can I?
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Oct 7, 2010
I got back to my laptop after dinner and found a blank screen with one line of text saying something about running out of swap space - I tried all kinds of key combinations but nothing worked to bring the desktop back - eventually I pressed and held the power button to shut it down - I suppose this is Ubuntu's version of the "blue screen of death"?I went to System - Disk Utility to make a 2GB free space right after the swap space. Then I tried to make that 2GB free space a swap space partition but it came back with an error
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Nov 25, 2010
How can I add more space to my drive since I only have 1gb of ram and plenty of hard drive space? Right now it does not seem to be utilizing the swap space very efficiently.
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