Ubuntu Security :: Block Users From USB Drive/Devices And CD-Rom

Sep 20, 2010

Block Users from USB Drive/Devices and CD-Rom I am using Ubuntu 9.10- the Karmic Koala(64 bit) in my company. I would like to block the users(except Super user) from using USB Drive/Devices and CD-Rom for security resons and to prevent my employees from copying data.

In Users Settings, I tried unchecking some items in User Privileges tab but it didn't work.

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Security :: Squid - Block Different Users Different Sites?

Feb 6, 2010

Example I have 3 user list and 3 file with block site names

acl group1 src 192.168.0.2 192.168.0.3 192.168.0.4/24
acl group2 src 192.168.0.5 192.168.0.6 192.168.0.7/24
acl group3 src 192.168.0.8 192.168.0.9 192.168.0.10/24

[Code]...

I've moved your post here to its own thread. Please don't resurrect dead threads. --win32sux

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Security :: Block Gmail Chatting And Gtalk For Few Users

Jan 20, 2010

I have blocked both gtalk and gmail chatting for total network using both squid and iptables. I want to give access for gtalk and gmail chatting to some user. How I can do it.

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CentOS 5 :: Cannot Get 1M IO With Block Devices?

Nov 19, 2009

I am trying to do 1Meg IO to one of the block devices but I can only get a maximum of 512K IO size. I can use the corresponding sg device to get 1Meg of IO. I was wondering if anyone knows why 1Meg IO to a block device is being broken down into 2 512K chunks? I have increased the /sys/block/sdg/queue/max_sectors_kb to 16384, but it has made no difference.

My uname is : Linux virgo 2.6.18-128.el5 #1 SMP Wed Jan 21 10:41:14 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

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Debian Installation :: One Or More Block Devices Are Holding

May 28, 2013

I'm using a Dell SC440 server for this effort. I started with Debian 6.0.7 32 bit i386 version in mid April and everything seemed to go smoothly until the first boot finished, I wanted to look at the hard drive just to see what storage space was left to work with. The drive was not recognized and I could not mount it. The error message was "One or More Block Devices are Holding /dev/dm-0".

I could not find anything on the debian forums that seemed to relate to the error message so Google led me to the same problem on Fedora, Ubuntu and one other distro. I flattened the machine and restarted from scratch. This time using Debian 6.0.7 AMD64 version. The install went well but I had the same problem with the same results. So I started over several more times before the new Debian 7.0 AMD64 version was released. Under Debian 7.0 I not only get the same error message but I also get a message that my video card is not supported under this new version of gnome and sudo does not work.

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Hardware :: Steps To Block Usb Mass Storage Devices?

Sep 7, 2010

steps to block usb mass storage devices in linux

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Ubuntu :: Block Users From Looking Into Folders Of Others?

Sep 1, 2011

I created an account for my brother but it's a very limited account, just so he can browse and listen to music and stuff like that.However, what I do find funny is the fact that accounts are secured with a password but limited accounts can browse to /home and see the files of everyone, even admins, without Ubuntu asking for a password.I obviously do not want this to happen.Anyway, is there any way I can block him from being able to browse to my homefolder, other than encrypting it?

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Security :: Sudo For Users But Only +r On Other /home/users Ubuntu 10.04 ?

Nov 1, 2010

We are trying to set up a classroom training environment where our SIG can hold classes for prospective converts from Microsoft/Mac. The ten machines will have /home/student01..10 and /home/linsig01..10 as users. We want /home/student01 to be able to explore and sudo so they can learn to administer their personal machines at home. We don't want them to be able to modify (sudo) /home/linsig01. I've seen the tutorial on Access Control Lists but I'd like other input so we get it right the first time.

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Ubuntu :: Block Xp Folder Access From Users?

Jan 6, 2011

how to keep the XP my documents folder private and blocked from other XP users, but I can still access this folder from all of my Ubuntu user accounts.

Is there a way I can block this folders access from within Ubuntu?

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Ubuntu :: USB Devices Not Mounting When Switching Users / Logging On With Different User

Feb 28, 2010

I have an external USB drive that is NTFS. It mounts fine under my account and my wife's, but only if I fully shut-down the computer between switching. While switching users or logging out then in with a different account it will not mount the drive. I am not sure what to do... but we both access data from the same drive.

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General :: Block Unknown Users In Pidgin?

Jun 16, 2010

How can I block messages from people who isn't in my buddy list in Pidgin?I always receive a lot of bothering messages from people who is not in my list, I have look at all the options in Pidgin but I didn't find where to set this condition.

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OpenSUSE Install :: Allowing Users Other Than Root To MOUNT Devices?

Dec 28, 2009

I have a non-super user on my box which I'd like to give it MOUNT and UMOUNT permissions but I don't know how.For example purposes, the user name is "USER".I don't want to make it into a SuperUser, just give it rights to be able to issue the MOUNT and UMOUNT commands at the terminal.

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Ubuntu Security :: Selecting The 'Available To All Users' Option In Network Mgr Mess With Security?

Oct 15, 2010

To avoid having to input a password for the keyring each time I connect to the net via wireless, I enabled the 'Available to all users' option in Network Manager. Now, my question is this. Are the 'users' it refers to just those created on this machine? Would a drive-by be able to use my network without entering the password?

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Fedora Networking :: Block Certain Sites For Exception IP List Users?

Nov 3, 2009

I have FC-4 with Squid and Dansguardian. Internet Users in my organisation are configured to use proxy with 8080 in browser IE. There's no issue with Users as DG working perfect for them. We have Business Development Team, as they need to do most of the research over internet, their IP's are included into "Exception IP List" in Dansguardian. Obviously these people will be excepted from all banned sites, BD Team able to do chat, play games and do social networking and other stuff over the net, which results in more bandwidth consumption and breaking office policies.

I have tried to implement SQUID ACL's to block few sites like " meebo.com, orkut.com,facebook.com etc" but SQUID acl's not coming into picture. any one who successfully blocked chat, banned sites and social networking in DG with my case.

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General :: Shared Machine Block Home Folder Access To Other Users?

Aug 17, 2010

I'm setting up a Linux machine thet'll be shared by several users, some of whom will be admins. Is there a way to restrict access to a user's home folder (encrypt or block completely) for other regular/admin users?

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Server :: Allow Users To Receive Emails From A Few Select Domains And Block The Rest

May 4, 2010

I've got a request from one of my company's subsidiaries to block all incoming and outgoing mail for a group of users. I've read up some guides on access.db and I know how to do that, but now they want to allow these users to receive emails from a few select domains, and block the rest. To summarize:

1) Block all incoming and outgoing email to users in team A, except mail from [URL]
2) All other users can receive and send mail from/to any domain.

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Software :: Disable / Block The Accounts Of The Users Who Have Not Accessed The It From 2 Months From Today

Mar 4, 2011

We have 4 servers having rhel 5.2. We have several users logged in on one of them. We have nis server/client running on them and have common home area mounted on all of them. Now we want to disable/block the accounts of the users who have not accessed our servers in last 2 months from today. What logic should we apply to do so? We were checking stat of .bashrc of each user but is not correct logic. We are going to write shell script for the same. We don't want to do anything in users home area or their files.

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Security :: Users Subverting Security On Purpose / Kerberos Only Answer?

May 12, 2010

I have an environment with multiple projects that have a variety of government and commercial sponsors. We have been satisfied to this point with a netapp serving nfs/cifs and keeping a tight reign on nfs exports.Some of these projects have started asking us to provide access restricted sub-folders of the project space based on different groups that contain a user subset of the primary group.

We have a linux machine that serves as a version control front end to the netapp, mounting the project spaces via nfs. People are now mounting their project space via sshfs to this "front end" and sharing the root password of this sshfs client with everyone in their project, in turn creating a security hole to access the so called restricted sub-folders. I know all the obligatory responses referring to irresponsible user behavior but would like to see how others have addressed something like this where user behavior seems out of control.

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Ubuntu Security :: Block Incoming URL In 8.10?

Jun 17, 2010

I'm trying to block an incoming URL. My ISP is hijacking 404 pages and annoyingly changing the URL line in the browser and flashing all sorts of popup ads. I just need it for incoming URLs which my router doesn't seem to handle. I'd prefer something packaged with Ubuntu 8.04, but anything simple will do. I know in KDE I could edit the kdeglobals file with:

[KDE URL Restrictions]
rule_1=open,,,,[URL],,false
rule_count=1

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Ubuntu Security :: Block Pinging With GUFW?

Jan 25, 2010

I did one of the recommended port scans and all ports passed but failed on pinging. How do you turn pinging on & off with GFUW?

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Ubuntu Security :: How To Block Subdomain Of Any Site

Mar 26, 2010

My question is how to block a subdomain of a site. To make it as clear as possible, I'll give an example. I am regularly entering this arbitrary site [URL] which redirects me to this page [URL] and this index.html takes an image from a subdomain which is a subfolder of itself, that is: [URL]. What I am asking is blocking the images to be taken, but not the main page itself, i.e. to block www.somesite.abc/images/ without blocking the overall www.somesite.abc.

My idea was to use the /etc/hosts file by redirecting to loopback address:
Code:
127.0.0.1 www.somesite.abc/images
But it looks as if it doesn't affect things at all. Should I use it another way? Modifying /etc/hosts.deny maybe useful?

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Ubuntu Security :: Firewall Does Not Block Tor Connections

Oct 2, 2010

I have noticed interesting problem. I use two browsers - Firefox and Konqueror. Konqueror is configured to use tor, Firefox not. Using Gufw I block all incoming and outgoing traffic and it works while using Firefox, I mean that I can't view any www site and it is ok. But if I use Konqueror I can establish any conection. How to understand this? Should I have different firewall while using tor?

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Ubuntu Security :: How To Block The HTTPS Sites

Jun 17, 2011

I want block https sites if suppose block the http it will opening in https.

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Ubuntu Security :: Can To Write Block All But NOT Rule For UFW?

Jul 23, 2011

For example, can I write something to the effect: block all outbound UDP connections over port 53 except those going to IP 123.456.789. Or stated another way: Block outbound to port 53/udp NOT going to ip address 123.454.678Is it possible to do this? How would I write the argument?

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Security :: Block Ips With Lot Of Connections?

Oct 31, 2010

on my linux server i have many websites but with difrent ips address, is some way to i can block all the ips with many connection (100+) just from my website not from all websites

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Security :: Iptables To Block Ip From Ftp?

Mar 6, 2010

Is this how I would do that?

iptables -A INPUT -p tcp --destination-port 21 -d ! 168.192.1.2 -j DROP

This should block all incoming connections on port 21 from 192.168.1.2, correct? Thus preventing that IP from logging into my FTP.

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Ubuntu :: CD/DVD And USB Drive Devices Inoperative?

May 30, 2010

After installing Ubuntu 10.4, and rebooting, my cd/dvd and usb memory drives did not operate. An example of this problem is as follows: Upon inserting a cd or flash drive into my machine it would attempt to read the device but would fail. It would not display an icon on the desktop for either device. Upon opening Places>Computer the device would be displayed there. If either device were selected, and an attempt made to open it, the machine make another attempt to open and fail again.Ubuntu 10.4 was a clean install. I then did a clean install of Ubuntu 9.10 with all updates and everything worked fine, then upgraded to Ubuntu 10.04 with the same results.

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Ubuntu Security :: Block All Ports Except Pop And Smtp In NAT Through Iptables?

Jan 20, 2010

how to block all ports except pop,pop3,smtp in nat using iptables in squid on redhat A3

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Ubuntu Security :: Ban Everything And Anything From That Block, Pref Without Upsetting Firehol?

Feb 1, 2010

now still don't know how to use that properly.now after a quick sudo tcpdump -n -i eth0 > tcpdump.txtits obvious to me at least that anything 85.9.102.* is not to be trusted.see attached.how do i ban everything and anything from that block, pref without upsetting firehol. whats opinions of ipcop, btw.

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Ubuntu Security :: Block PHP Injection Attacks With Fail2ban

Apr 12, 2010

I'm trying to implement this method to block php injection attack using fail2ban: here it is, however I'm not sure it applies to Ubuntu. You see, there's this filter that must be added to the fail2ban jail file:

HTML Code:
[php-url-fopen]
enabled = true
port = http,https
filter = php-url-fopen

[Code]....

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