Security :: User Bypassing Demo Restrictions?
Jan 17, 2010
I have a user that has already used up a demo 24hr trial on my website. At present, I only check the customer id and the IP address to search for duplicates. On the whole this works but it's not foolproof. We now have 1 user from China that is changing their IP address everyday to get access to the free trial. Any options on what to do? I thought of downloading a cookie to their computer that the website could pick up - again not foolproff but most people don't disable cookies. Any other options?
I could ban China temporarily until the user gives up but if they find another proxy to chain then their IP address will be different again.
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May 3, 2011
How to create a user account on a Linux desktop machine with restrictions on connecting to the LAN, WAN, PCMCIA ports, Firewire, CDROM and generally any user controllable output options?
I have the task to set up a machine for users working with sensitive data that should not be leaving the machine where it is processed. This means disabling access to the ethernet device, lan, all other ports as mentioned earlier, and any other way of leaking the data.
In Mac OSX this was achieved using "Parental controls" from the System preferences; this even allows a selection of the applications that can be used. Under XP, Device Manager offers the option to click various devices and "Disable" them, which worked so far just fine. Some will point out that the latter mentioned OS may be easy to circumvent the security of in other ways, but that has been mitigated with other measures and it's not the point anyway. For the operator users in question, the aforementioned measure proved successful and worked.Using OSX and XP to do this was a 10-15 minutes job with testing included.
So far all guides and tutorials pointed to useradd, groups an facl, but in actual practical terms did not help at all, in fact most of the research did not render any practical results so far. I surely don't expect to point and click, and would gladly run a set of commands from CLI. If I had them. I would really would like to achieve the same restricted user account configuration in a concise, comprehensive and practical manner under Linux too. Preferably tested on humans before, and known to be workign, of course.
The machines that need to be set up are two laptops running Ubuntu. So how can this be accomplished in Linux?
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Nov 16, 2010
I was under the impression the Linux (in my case the Fedora OS) is very secure. However I've learnt with deep concern that that one can have access to the system during system startup i.e one can give various startup directives and bypass the normal login UI to have direct root access.
Is there a way to disble this so that the directives during startup are fixed and cannot be altered. I would like to make the system secure to the maximum extent possible.
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Sep 1, 2010
I setup a SSH server on my computer on a very high port, so that my brother could surf the web through my computer from Iran, since the majority of websites are filtered there.
Today, he told me he cannot connect to my computer. That's why, I got suspicious that they are doing packet based filtering instead of port. Then I decided to change the port to 433 for https, but one of my friend told me that they just banned https in Iran as well.
I was wondering if there's any way I can manipulate SSH packets between two computers so that my brother's ISP won't figure out he's exchanging SSH packets?
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Feb 16, 2010
I have searched other post on here and they appear to be relevant but when I enter in the exact same commands it denies relay access to everyone. I have also used the postmap command to refresh the database.
Feb 16 15:54:48 EMAIL2 postfix/smtpd[6512]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 554 5.7.1 <josh.dobs@gmail.com>: Recipient address rejected: Relay access denied; from=<msolis@EMAIL2.drewmedical.com> to=<josh.dobs@gmail.com> proto=ESMTP helo=<192.168.1.51>
I used this page as reference. [URL]
Below is my main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
[Code]....
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Feb 15, 2010
Been trying for some time to get Postfix to not allow some internal users to send email externally. I have found some good resources online but none of them work. The user is still able to send email internally and externally.
I used the following web pages to assist me... [URL]
Below is my main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
[Code]....
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Feb 16, 2011
Is there a program available that would allow me to create an index in a pdf file that has no security restrictions on it? I know people can lock there files so I am not worried about thise but if I have open permissions on a pdf file how do I go about creating an index. It seems that by default you get the thumbnail view but I like to be able to click on a index list to go to a page.
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Feb 2, 2011
created a user but i forgot to change the home directory permission.so after user created when i go to the user and group mangement i cant see that permission filed related to the home permission directory.my purpose is to stop accessing other user to my home directory,how it can be possible??
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Oct 31, 2010
I ordered a free Ubuntu 10.04 Desktop CD and followed the instructions(put it in the dvd rom and restarted my laptop). All goes very well up to one point when it's loading, but there's no progress. I left it so for about an hour while I went out to see if it would load, but when I got home the screen was the same(even the loading animation stopped). I have Windows 7 installed and I want to install Ubuntu on another partition.
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Apr 15, 2009
I've been looking for this feature for months and couldn't find a solution for this. Does anyone know how to create users and limit the user to a specified directory?
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Aug 4, 2010
I am on Linux on machine LOCAL (my notebook).I ssh into a company machine REMOTE which is behind a firewall and ONLY allows incoming ssh connections (port 22), no outbound connections whatsoever. I do have full root access on both, LOCAL and REMOTE, REMOTE is however a VPS and behind a hardware firewall.I now need network access on REMOTE (HTTP and other protocols) for downloading and building some software. I also need to access to NON HTTP protocols such as git.
I was hoping to set up a reverse SSH tunnel for using my LOCAL machine, where I could be running a socks server. So that network access on REMOTE would be redirected over the SSH tunnel to a socks server running on machine LOCAL.How would I go about setting something like this up?
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Feb 18, 2010
I have done some research on the net and I am battling to find effective methods in other to bypass those irritating ISP traffic shapers. I have used SSH tunneling to reduce latency (which is my primary goal, i dont care about silly torrents, etc) by about 200ms.
Do you know of any other way that I could improve this latency? When I ping my server in Germany (from South Africa) i get a latency of about 185ms... I was hoping to get online gaming traffic to around about 250ms or even less if possible... Right now its sitting on 550ms WITH SSH tunneling and 800ms without it... (to Blizzard servers)
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Jul 26, 2010
I can bypass our firewall in IE. They use wildcards, like 10*. I've tried 10.100.0/16, but am still getting to our firewall. How can I specify the correct settings for Firefox?
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Mar 23, 2010
i need to setup a demo desktop environment for ppl to try out a java based gui. i need to put this demo on a VPS server, run a vncserver, and use a web-based vnc viewer for ppl to access to it. what is the best desktop environment for this case, 1. my vps server only has about 200m memory left 2. i need to have java swing set running 3.it doesn't have to be cool, but it needs to be quick. i heard that freeNX is quicker, but i doubt there will be a web-based viewer around. i tried both gnome and xfce4 on my virtual machine and vnc to it, strangely i found out gnome is somehow faster than xfce4 which is supposed to be otherwise.
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Feb 2, 2011
What security mechanisms are used by recent versions of the Linux operating system during user authentication?
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Oct 1, 2010
I am looking for a free version of something similar to Camtasia [url] or TurboDemo [url]
I have seen Wink, but it doesn't allow you to highlight regions/zoom etc.
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Apr 2, 2011
What's the best solution to capture video to do a demo/presentation ?
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Apr 17, 2010
I have downloaded the Mediawiki demo appliance from UEC store. I have installed it and also it is running. I would like to know how to access the mediawiki demo appliance. I tried accessing it as [URL] but is not accessible.
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Apr 27, 2011
I know this isn't directly related to Ubuntu (even if the rest of my network is pure Ubuntu!), but I haven't had any luck uncovering this info through the usual channels. Does anyone know which port Android 2.2 on a VIA wm8650 uses to access the Internet? My Wifi is routed through a Linux firewall (Ipcop) which forces normal outbound Internet traffic via normal ports (80, 8080 etc) through the ipcop proxy, but the wm8650 somehow bypasses the proxy. I don't know whether I'm just missing the port the tablet is actually using.
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Jun 3, 2011
I am looking for a way to permanently delete files immediately - no trash, no taking up space but a command to make a file immediately gone. I have a USB flash drive and it has a hidden .trash file on it that builds-up until I have no more room on the flash drive - all space taken up by deleted files. I need a command that bypasses the trash and immediately deletes a file for good making space available.
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May 26, 2010
I am not sure whether it's possible or not. We running squid proxy server for our office. We restrict users using ACL to access the internet. There is some who do the followings:
1. Create a own proxy in there box who has the internet access.
2. Other users use those box as proxy and access to the internet.
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Mar 4, 2010
lgfxgears is the new minibenchmark for your graphics card. Its compatible with wide range of hardwares. The new glxgears alternative looks better, and speed depends on graphics card and driver's power. It compatible with linux, and windows. I would happy if peoples would poste here they results. i alreday have a few:
nVidia GeForce 9800+ 180 fps win
ATi Radeon 9800 pro 62 fps win
ATi Radeon 9800 pro 76 fps linux
[code]....
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Feb 18, 2010
I tried to boot from CD for demo mode (9.10) but my XP machine wouldn't do it. I opened CD from My Computer and a selection window opened. Choices were to reboot to demo, Install to Windows or Help with Boot. I selected Help with Boot and a boot program was downloaded and installed (I think to drive C: (XP)). When I restarted, a new boot window opened giving me a choice to boot to XP or Ubuntu (9.10) and I chose Ubuntu. Instead of opening for demo it went to full install and I aborted the procedure, went to add/remove programs and uninstalled Ubuntu. Now when I restart I still get the boot selection window, Any suggestions as how to remove the boot program? Can't find it.
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Mar 30, 2010
I have installed and un-installed 3 different versions of Ubuntu. My fourth is a re-install of v9.10. During all these installs I have had difficulty getting my wifi to work. During my last install I left the ISO in the drive by mistake so when the system rebooted it loaded from the disc in demo.... This was interesting because in the demo the program manager showed 2 drives for wireless, 1 Broadcom STA and 2 Broadcom b43xx. I tried loading the STA and it worked! (sorry it could have been the b43xx, for the time being it's insignificant) Upon my excitement I restarted the computer and removed the disk went to my Ubuntu set up and ...what the Broadcom choices weren't there Why?
Now I am running Win 7 Home 32bit on my main drive and have Ubuntu loaded on its own drive. I have a Netgear WN311b wireless N card installed. Again my confusion is why it worked in demo (off the cd) but doesn't from full install. I read on the web to try inserting my supplied disc from Netgear and then search program manager. It now showed the two for-mentioned Broadcom programs, but this time wouldn't install them. On the b43 I got an error message and on the STA it searched extracting and loading this continued for a 1/2 hour with no progression. I couldn't close the PM or the extracting and loading box, so I had to restart the computer.
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Apr 11, 2010
I was running a ubuntu server on another PC which has no keyboard. only power and lan cable is connected and i was remotely admining it from my desktop PC. When i turned that Server PC on earlier , it goes straight into user login screen of ubuntu server. But right now i see the grub menu list which is expecting the keyboard Enter input. how do i remove that so later on i don't need to plug the keyboard and hit enter to goto server login ?
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Apr 23, 2011
I'm trying to backup my old PC games so that I can finally banish their CDs to the attic once and for all. I've just been using the DD command to grab iso's of my games so far, while keeping their keys in a text file (see the DD command below). However, I just hit my C&C collection and I'm having some problems with some of the newer games like Renegade and Yuri's Revenge. I think they must be copy protected or something. 4 of my last discs have stopped copying at exactly 1.7MB (3 seperate DVD drives, 2 IDE, 1 USB enclosed). Can you guys think of anything else that will cause DD to fail at this location? Any ideas? I'd prefer it to be a command line option, as I'm trying to make things go as quickly as possible. Here's the command I've been using. code...
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May 19, 2010
I am having trouble accessing social networking sites like orkut due to govt restriction.
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Jan 6, 2010
I have an XP laptop, currently running very low on HDD space and RAM capacity, waiting to be replaced. Very slow indeed. It recently had problems booting up, and now takes about 20 minutes to get fully started. Is it safe/advisable to run the demo version of Ubuntu from the LiveCD? I really can't afford to trash or crash my computer, it's got lots of important data on it etc.
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Mar 27, 2010
I'd like to limit ps aux command outputs to current user only(the one, who invoked "ps". I've recently saw this feature on FreeBSD systems and on at least one Linux system running on shell.sf.net. I run Linux 2.6.33, I wanted to know how to make that. Any advice? Googling around wasn't too successful, perhaps I don't know how to query that, recently tried with "limit ps outputs" "ps aux current user", etc... had no luck.
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Jan 1, 2011
I try to understand the reasons for restricting DVD and MP3. My conclusion so far is that DVD is restricted due to software patents (and the DMCA). The software decoding DVD is open software, though. What is the situation regarding MP3? It is also restricted. Is it due to the same kind of software patents? As I understand, the MP3 codecs are not free software (like DVD)?
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