General :: Secure Screen For Use With A Menu Script?
Dec 10, 2010
I'm launching screen with the following command, inside a shell script that is set as a user's shell to keep them from escaping.
screen -dRRq -S ${USER}_MC -s $HOME/runthis.sh
Is there a way to secure screen, to keep the user from being able to even use the escape sequence, or at worst, prevent them from running commands like exec?
Edit: It's not that the user should have access to an actual command-prompt shell. I only want them to be able to run a single program that runs persistently, and as far as I know screen is the easiest way to do that. However, getting out of this is as easy as C-a : exec bash.
Right now I've just unbound most of the keys using .screenrc (especially colon), I just want to make sure I'm not missing something easier.
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Jul 11, 2010
such as a roll of aluminum window screen that you might get at Home Depot, and provided that there are no gaps and that it's grounded?
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Jun 8, 2010
I just set up a separate monitor, I am running Ubuntu 10.04, I use the nVidia graphics driver, Now the Bars on the top and the bottom of the screen won't appear and can't be used. I rebooted w/ out the second monitor and now it disabled itself. I can't get the terminal option at the login screen. When I rebooted the first time w/ the second screen icon's on the desktop appeared. Now nothing appears, but the background. I opened up my browser (Google Chrome) by my key combinations for those who are wondering how I posted this.
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Dec 1, 2010
I'm an Oracle DBA and started working for my current employer about 4 months ago. This past weekend an alert re: FS space brought my attention to /var/spool/clientmqueue (full of mail re: cron jobs) and the fact that sendmail is not running on our Linux servers.I'm told that the IT security team deemed sendmail too vulnerable so we don't run it.Aside from FS filling up and missing notification of issues with crontab entries, I'm concerned that we may be missing notification of potential issues. In other Unix/Linux environments I've seen emails from the print daemon when it experienced problems with specific jobs.
Are there other Linux facilities aside from cron and lpd that use email to advise the users of possible issues? Are there ways to secure sendmail or secure alternatives to sendmail? My primary need/desire is to make sure that emails regarding issues on the server get to the appropriate users. Secondary goal would be to have the ability to use mailx to send mail out. There is No need/desire to receive mail from outside.
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Aug 29, 2014
I appear to have the exact problem that is currently listed in the 7.6 errata about EFI boot and black screen while trying to install ("Potential issues with UEFI booting on amd64"). The problem is that their workaround is not an option for me. This is a new rig and the motherboard doesn't appear to have any kind of ability to disable secure boot. I also don't know if my problem is exactly what they're thinking when it comes to that entry.
I'm able to get to the Grub install screen where you have the option to install Debian but when I select an option (any option) the screen turns off, back on but is black. All activity in the system stops after a few seconds (3-5 seconds) and that's it, she's done. I've tried all the options to try and disable secure boot but the options listed below are as close as I can get (and apparently should be sufficient).
The CD ISO used was the 7.6 netinst CD. I've also tried the Jessie ISO (Testing) that was downloaded about 2 hours ago. Same results. Unlike the errata which says "intermittent booting problems", my issue is consistently reproduced with no other result no matter what I do.
The rig:
-Asus H97-Plus running revision 2202
-Intel i5-4570
-32GB DDR3-1600
-128GB SSD Drive
-No external video card - using on board only but have tried both VGA and HDMI ports with the same result.
BIOS settings (is it still called BIOS or is it UEFI now?)
-Fast Boot: Disabled
-Launch CSM: Enabled
-Boot Device Control: "Legacy OPROM Only" or "UEFI and Legacy OPROM" (tried both)
-Secure Boot State: Enabled (it's grayed out and I'm unable to change this)
-OS Type: Other OS (supposedly makes it so you can boot non-Windows OS)
The Debian page with the errata: [URL] ...
Look for "Potential issues with UEFI booting on amd64"
The obvious suggestions I've tried:
-tried USB boot & CD boot - same result
-tried altering the grub script to add the ACPI options - no effect
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Nov 20, 2010
my Setup is Fedora 14 x64 + radeon hd 4830 i've downloaded .run package from ati site with latest driver for x64 systems. installed it, but didn't edited grub.conf becouse i didn't understood anything there (probably didn't spent enough time to get things understand) Now i've lost possibility to enter my Fedora system. during boot it lost it's modern blue boot screen (with filling drop), it was replaced by standard old boot screen with triple-color stripe. after this boot screen monitor start blinking going on and off. and on last step i'm getting "Fedora 14 boot bla bla bla something" on screen. nothing works except Ctrl+Alt+Delete. system reboots showing successful daemons shutting sequence. How can i edit grub menu from initial grub screen is it possible to it's own 'e' option or 'c' from grub command line?
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Apr 11, 2011
In Windows Explorer, if a file is focused, press Menu Key on keyboard, context menu will show on top of the file. But in Nautilus, the same action shows context menu where the mouse cursor is. That's a bit annoying. Is there anyway to make it work like Windows?
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Oct 27, 2010
i am having a problem on Ubuntu 10.10. In system menu, there is no Administration or Preferences menu.Also, application menu does not show anything. I am using Ubuntu since 2 weeks and still not used to to the terminal commands for running applications and admin tools.
one more thing.When i booted my PC today it reported an error and process terminated before reaching the login window. So i restarted and chose recovery mode. it also reported some errors and tried to fix the problem. it deleted some files i think. and my system is working again but with above mentioned problem.
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Apr 26, 2011
My problem is the links that are in the places menu in the gnome panal, all link to the appearances preferances. I'm running Fedora 14 with Gnome.
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Nov 14, 2010
i have java app. i want make my Linux dedicated to that application.such that,when Linux load it start the app, start menu have Shutdown,reboot and my application luncher, only one window , desktop right-click also have the same menu-items as start-menu.
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Aug 3, 2011
setting up secure ftp on linux
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Apr 21, 2011
there are different methods for securing based on home versus professional computers. My questions generally pertains to securing home desktops, but professional protection is definitely welcome :) Knowledge is power. Ever since moving to the wonderful world of Linux a couple years ago, I never even really thought about security. Seeing as most low-life scum make viruses for Windows machines seeing as they're more abundant.But how do I know if I'm safe/secure from anyone who want's to get at me or my stuff. I know that anyone who is determined enough to get in will, there's no question about that. But what steps can I take to ensure I'm protected from things like rogue root shells and automatic attacks? Also, is there a sort of built-in firewall/antivirus in more Linux distros?
I know this question is quite broad seeing as there are tons of ways someone could compromise your system, but maybe you could share what you did to make sure you were safe.I decided to not allow root login via ssh and to change the port is listens on to something random. Hopefully this a step in the right direction. Currently looking at iptables and shutting down services.
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Aug 9, 2011
I have a CF card I'd like to erase. My CF card reader is connected to my Linux machine via USB. How do I do a secure erase (i.e., the ATA Secure Erase functionality) of the CF card?
I have tried hdparm --security-erase NULL /dev/sdc, but I get an error: ERASE_PREPARE: Invalid exchange. In fact, any hdparm command gives me the same error:
# hdparm -I /dev/sdc
/dev/sdc:
HDIO_DRIVE_CMD(identify) failed: Invalid exchange
I read somewhere that hdparm can't do an ATA Secure Erase of a drive that is connected over USB. Is this true? I tried using sdparm, but sdparm doesn't seem to have the capability to send the ATA Secure Erase command to the CF card. So, what is the proper way to do this?
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Aug 14, 2011
I choose not to run a login manager on my systems, instead opting for a tty login and then invoking xinit manually (slightly long story, it makes my life a lot easier to have a bunch of environment tweaks that my login shell sets up and has the rest inherit), but this leaves me with a security issue if someone else comes upon my PC, because even if I've locked my X session they can switch to a tty and kill my X session, dropping back to a shell.
I can either
Start running xinit; logout (which still has a race condition issue, if they get another Ctrl+C in before logout is invoked it'll give a shell) Try to disable the tty switching keys in X Wrap xinit in something to catch and ignore the signal from the Ctrl+C
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Jan 11, 2011
can hdparm do secure erase on just a partition or does it have to be the whole drive?
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Mar 7, 2011
I am trying to do secure VNC over SSH to a remote linux server from my windows PC, but running into this error.
Error: Unable to connect to host: Connection refused (10061)
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Dec 20, 2010
My better half spilled some coffee on her 8month old macbook and it decided not to work anymore. Apple says it will cost around $800 or more to fix, we wont be paying that, Ill be finding a logic board or service somewhere online now that our warranty is shot and going that route.But before I send the macbook off anywhere I need to pull some data off the HDD. I was able to plug the HDD into my Linux box(internally, I dont have an external enclosure). I was able to mount the drive and copy the directories I wanted to the HDD on my linuxbox.
But Im unable to to access the directory from the terminal or from the file browser, I get an access denied message. Because I know the username and password for the macbook is there a way I can use that to gain access to the directories?Google got me this far, but when I googled "access locked directory ubuntu" or any variation of that with the terms linux and osx thrown in there for good measure.
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Mar 3, 2010
I am using Firefox 2.0.0.8 and Opera.Both the browsers can open all sites except secure sites like, URL>..In Firefox I have checked SSL3.0 and TLS1.0.The default Enforcing mode of the OS I have set to 'Permissive'.
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Jun 11, 2010
I want to learn using SSH (Secure Shell) service in linux and connect to SSH server with PuTTY to test some commands, but I have not worked with it yet;
I have Ubuntu 9.04 on my "Virtual Machine" and my host OS is Win.XP and I have installed "OpenSSH server" and "PuTTY" from the ubuntu repository,
Is this action rational? I mean I want to connect from PuTTY on linux(on VM) to the SSH Server on linux?
(Meanwhile, I have no work with the host Windows and just wanna test it on the linux!)
where should I see the "Host Name/Ip Address" of the SSH Server to enter in the PuTTy's dialog? In windows we can use "ipconfig" command to see the IP Addresses, but I don't know what is the command in linx for this purpose?
use SSH Service in ubuntu correctly
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Sep 23, 2010
If a user want secure coping of files through scp from one system to another system then how this can be done. This user have only been granted securing coping of files through another system but without ssh.
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Jun 13, 2011
I loaded Ubuntu on a Windows OS laptop and am finally figuring out how to connect wireless. Before I do what can I do that will protect me? I am told I don't need anti-virus. Is this accurate? Also, I want a really secure firewall...not one that an experienced hacker could see and just hop over.
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Jul 22, 2010
There are a couple commands I want to run in a terminal that require me to provide my password. I really don't want those commands ending up in any kind of history or anywhere else where they could be seen by someone after the command was run. Are there any shells/terminals for Ubuntu that I could use (or options to bash/zsh/etc) that would give me a secure environment where I don't have to worry about my history being kept?
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Aug 2, 2011
I'm looking for a live Linux distro that is secure and preserves my anonymity online. For what I need, Tor seems to do the job - but such software requires configuration that someone who is not knowledgeable in how it works might find difficult. I was looking at 'Lightweight portable security' but it does not specify whether it sends all traffic through Tor. Does anyone know more information about it and/or any other such live Linux distro?
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May 13, 2010
i believe it is a wpa_supplicant problem. running ubuntu 10.04 on a toshiba netbook. i have my account which cannot connect to internet, wicd returns an error that it cannot obtain ip address. cannot even connect to a unesecure network for that matter. if i switch users to another user and do the quick switch users i can get internet then i switched back to my main account and here i am postings. how do i begin to hunt down the problem logs, settings how do some of you begin to hunt down the cause of this and where it would be located.
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Nov 25, 2010
I've been searching for the exact set of tools to accomplish what I need. I was once at a LANparty. I used my webmail account and I think someone stole my password. I realized that the LAN used hubs instead of switches.
So next time, I thought I could run a server at home, which would allow me to connect with SSL (??). Then I would be able to connect to whatever website knowing that I was secure between myself and my home computer. I guess I would need to have a key before a secure connection could be made. Otherwise a "man in the middle" kind of exchange could take place.
So I guess I would need a VPN between myself and my home computer. Then my home computer would act as a proxy to allow me to surf securely. I'm not sure if these are the correct terms to use. Does anyone know what type of server I'm looking for?
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Jan 7, 2010
Been messing around with Ubuntu 9.1 for the last few weeks and am loving it so far. Been trying to get in the terminal and learn a little something, to no avail. LOL I have been googling and searching the site today for info on networking. My Linux box is a desktop, with my main HDD mounted with music, and movies and some other stuff. My intent is to network the two laptops in the house (Windows XP and Windows 7) to the Linux box so I can listen to my music and watch movies when not in the office. I have found some info, mostly involving Samba, and plan to install Samba tonight and fiddle with it. My issue was with security. I have read a few posts and they talk about the fact that if you share files in this manner, the set up is not secure at all. Is this something i should really be concerned about? If the folders I share only have my music and videos in them,
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Nov 2, 2010
I am running WHM and CPANEL on centos.I would like to upload a file to the root user directory. To be honest, my only experience uploading and downloading files with FTP has been with domain related accounts that were set up under WHM to be managed under CPANEL. This is quite simple, because all you do is set FileZilla or Dreamweaver up with the FTP address of the domain account and the username and password.How can I do something similar to FTP a file into the root or home directory?
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Mar 9, 2010
Can any one tell me a good GUI based tool to secure PHP code . i have tried ioncube but its not GUI based on linux
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Jan 31, 2011
Looking to build the first computer system from scratch and I have chosen Linux as my system. Learning about Linux is a must as I would like to get away from MS. Also, building the system will better equip me when I pursue a business venture within the next year or two.I presently take course work in accounting for a bachelor degree, but will attain another degree in software engineering, both from Herzing University. My present skill level in programming?
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Feb 23, 2010
I have the following details on my system:
- CentOS
- RHEL 5
- WebWare for Python
We have an exisiting website written in Python and was developed by other entities and now being maintained by us. We want to run the website using secure connection (HTTPS), I tried reading this article and successfully executed every instructions but still failed to run the website using HTTPS.
[URL]
The way we run the website is using port 8080, e.g. [URL] I am sure I am missing something here, first, I am still looking on where does the port 8080 comes from since I've checked the httpd.config and it wasn't there.
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