Fedora Security :: Guest Accounts And Encryption ?
Mar 22, 2009
I have an encrypted /home partition but would like to set up a guest account for my brother. Obviously, encryption doesn't work so well when you give out the key so what I'd like to do is specify a different, unencrypted location as a home directory for the guest account so he doesn't need access to that partition. Is there a way of doing this?
I've got fedora 10, dual boot with windows, 2 hard drives, 1st is NTFS windows. 2nd is split into a swap, ext3 for the OS, and an encrypted partition for /home.
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Jan 27, 2010
I'm running a network with a NIS. I want to implement a guest account on my network. The requirements are that the guest can log in on multiple computers at the same time and that the guest account's file are wiped out when they log off. The problem is that when guest is logged in on two different machines some programs (like firefox) will only run on one of them at a time. Is there anyway around this?
Also: I anticipate a settings nightmare. If guest is logged in on one machine and changes the desktop background then guest logs in on another machine will the background change in both places? What happens when the same file is written at the same time?
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Nov 20, 2009
fedora 10 and im trying to set up some user accounts on a computer. My current problem is that we set up 2 root accounts and we need both to be able to authenticate. So far this works on the command line but whenever i'm on the GUI it seems that it only allows root to give its password for things. How do i enable the second account to do that as well.as a note, i am doing this for someone else so i have little to no control how this is set up, so please, i am not looking for reasons why this is not a good idea i would just like to figure this out
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Sep 25, 2009
way to automate adding and removing users from 10 different Fedora 7 servers. We use them as print servers and our users have a user name and password to authenticate with when printing. We also use Samba to talk to a W2k3 server that tracks and charges the users for what they print. The set up was done by a vendor and after 6 months of being in production the scripts they created has flaws.
I need a way for a script to run as often as possible that will remove, change, or delete user accounts from the servers and from Samba. how to most effectively achieve this?
It would be ideal to have a file that gets written to when a change needs to be made then a script to make these changes?
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Jan 1, 2011
My Linux is Fedora release 13. I found there are a few users created not by me. I am not sure if the system got hacked somehow. Then the hackers created these users, i.e. (1) oracle, (2) exim, (3) test, (4) cox. I tried to delete all of these four users by using "usrdel" command but the system said "I cannot delete these users as the users are logging in". If my system got hacked ?? or these users are created by the system itself?
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Oct 19, 2009
When I installed Fedora selected the option to encrypt the hard drive. I want to change the passphrase, is there a way to change the passphrase, or do I have to re-install Fedora?
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Jun 17, 2010
1.) I am wondering how to enable the lock to an encrypted partition which has been unlocked, using luks? On boot, I am been asked automatically for the pass phrase to unlock my partitions. After doing a back up, I want lock the encrypted partition again, but I don't know the command?! I umounted the partition but after mounting it again, I was not asked for the pass phrase but had access to my data.
2.) How secure is the default fedora version of luks? Is truecrypt better?
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Feb 24, 2009
I was trying to install Fedora 9 on my new laptop that came with Win XP. I have selected the option to wipe out all partition and create a default layout with the Encryption option selected. But that installation got stopped on the middle, therefore I have started the installation again. This time it asked for the encryption password as expected but don't know why, its not accepting my password. I am 100% sure that the password is correct but it is not allowing me to enter into the hard disk partition section.
My question is, how do I remove encryption from my hard disk? I don't need to preserve the data, I just need to use my hard disk again. Is there any boot CD that allow us to format encrypted disks without prompting for a password?
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Jul 28, 2009
I have currently a file server that runs on Fedora 9, and all other PCs (mostly running Windows XP) access the file server via SAMBA. Everything works perfectly! However, lately a home invasion in my neighborhood got me thinking. If they take my file server, my data is not protected. So, I would like to implement the LUKS partition encryption (/home) which sits on a separate disk. However, I don't quite like the decryption process at boot time. In other words, I would like to wake up the file server (WOL) remotely, and when it's done booting, I would like to log-in using the other PCs and enter the passphrase remotely to decrypt /home. Is this possible using LUKS encryption (i.e., cryptsetup)? If not, what would be another alternative to what I am trying to do using a secure encryption (so that the data is safe from thieves)?
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Jul 19, 2010
I'm planning a fresh F13 install, with separate partitions for /boot, /home, /tmp, /, and swap. All but /boot will be logical volumes, and I'd like to encrypt all but boot. If I encrypt the underlying partitions, is there any reason to also encrypt the logical volumes themselves?
my system will be:
HP dv6-3040us Pavillion laptop
AMD Phenon II
4GB DDR3
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Jun 14, 2011
I have a computer running Fedora 14 and when I installed it, I chose to encrypt the drive.
I've recently changed the way I have things set up and don't want the encryption any more. From what I've read there is no way to simply and easily remove the encryption, so what I would like to do is input the pass phrase remotely.
so, Is there anyway I can type in the pass phrase remotely, or remove the encryption?
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Jun 25, 2011
I have been trying to setup IPSEC encryption between two linux boxes. I have a server application which runs on Linux Box A and a client application which runs on Linux Box B. The client sends the data to server. I have captured wireshark logs at both server and client end. In the wireshark logs I can see that the Box B send ESP packets to the Box A.
But the server Application running at Box A is is not able to get any packets. If I turn the policy off at Box B, Box B sends normal UDP data packets to Box A, but still the Server Application running at box A doesn't get any packets.( Expected behavior since policy at Box A enforces that all packets coming from Box B should be encrypted.)
If I turn the policy off at Box A and Box B both, the server application receives the unencrypted data which is also expected behavior. But when the policy is turned on at both the boxes the encrypted packets reach the Box A but are not delivered to the server application. If anyone has faced such issue please help me to debug this issue. I have attached the ifconfig and policy settings at Box A and Box B for your reference.
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Sep 8, 2010
I like to encrypt my swap and tmp partition with /dev/urandom but it doesn't work. I tried it 100 times and now I have no idea.
Code:
cat /etc/crypttab
swap /dev/sda3 /dev/urandom swap,cipher=aes-cbc-essiv:sha256
cat /etc/fstab
/dev/mapper/swapswapswapdefaults0 0
If I reboot I get the message "/dev/mapper/swap" doesn't exist. It seems, that crypsetup doesn't setting up the encrypted block device. SElinux is in permissive mode.
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Jul 1, 2009
so, sometimes happen that while I'm on my pc comes my mom and say "can I look a things 10 minutes?", this means that I have to leave my computer in her hands for ten minutes... enough to make something wrong! In ubuntu there is a usefull button "start guest session"..but here in fedora I can't find it...So, I create a new user and I called it "Guest" and I eliminated the password, so they can access also without me... but I have some problem:a) I set the home directory of this guest in /tmp/guest thinking that in this way everytime the home directory will be clean... but this doesn't work...b) is there a way to prevent in all cases this account to autenticate as root? So, if they try to install something it hasn't to show the box "autenticate as root", it has to say only "you can't"
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Jun 7, 2011
I am not very security minded...I'm aware of it, and always made sure I had up-to-date overall protection in Windows but firewalls, and the blasted passwords are largely a thorn in my side!When I got my iPhone last year I suddenly discovered password managers & "wallets" to keep all that kind of information in and syncable across different devices. My life got so much easier. Of course now I need to figure out encryption keys, and how they work (I'm clueless). I also need to find a program or system that I can move my existing low-tech info (mailnly user name & passwords) that will also accomodate the increased needs of Ubuntu security and still be sync-able. I started a little research weeks ago, but my current "wallet" only exports .csv so I quit since I'm going to have to do a lot of data entry whatever I go with.So here goes:
1) what is the difference (bare bones) between using an encryption key (e.k.) vs. a standard user created password? what situations are better suited for e.k.?
2) I have seahorse (default intall with Ubuntu I guess) but the only thing in it is Login under passwords which leads to a login keyring (?) and a drop-down list of about 6-10 of the gazillon passwords I use daily. The other tabs are for keys which I don't have any concept of.
3) I know FF also "remembers" user id & passwords as you choose to have it do so. Is that information transferable into seahorse or another program?
4)I'm also (today) getting ready to really set up my system for user names & security across my little home network. How can I integrate that into whichever program/app I go with to store my pwds and keys?
5)give me links to fairly current documentation on this stuff?
6) Any program/app recommendations.Pros/cons uses, what they can & can't do or be used for, etc.
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Dec 23, 2010
I am building an active directory and using BIND9 as my DNS. To allow for secure dynamic updates from the domain, I am enabling GSS-TSIG as detailed here and here. Unfortunately, some of the commands and configurations used here seem to be depreciated, at least in the newer versions that I'm using. My issue is one of keytab encryption. I generated a keytab using ktpass.exe on the Windows Server 2008 domain controller. I have tried DES/MD5, AES128/SHA1 and AES256/SHA1, each have been turned down by ktutil on the kerberos server (FreeBSD). Each time, it outputs the following error: ktutil: AES256/SHA1*: encryption type AES256/SHA1* not supported *Respective to encryption used.
I cannot find a list of suitable encryption schemes that ktutil will accept. The FreeBSD handbook details a means of producing a keytab file, but I'm not sure how to configure the Domain Controller to use the keytab.
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Mar 16, 2009
I have a local file server running Samba on Fedora 9. It's already configured and serves a few people without any problems. I am now trying to set up a new read-only share with the username 'guest' and the password 'guest'. However, with no success so far! If I log on as 'guest' with the password 'guest' like so:
Code:
su - guest
No problem. Once logged in, if I try:
Code:
smbclient //samba/share
I'm prompted for a password. If I enter 'guest' I get:
Code:
session setup failed: NT_STATUS_LOGON_FAILURE
If I enter nothing (null) I get:
Code:
Anonymous login successful
Domain=[RIVER] OS=[Unix] Server=[Samba 3.2.8-0.26.fc9]
tree connect failed: NT_STATUS_LOGON_FAILURE
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Apr 3, 2011
I installed a Fedora 14 guest on a Fedora 14 host with Virtualbox, then i run these commands on the guest:yum install kernel-devel kernel-headersbut if i try to install the virtualbox-guest additions on the guest, is still complains about that it's unable to find the kernel source directory?Ha anyone succeded installing the guest additions on a guest Fedora 14?
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Jun 3, 2010
I had a lot of trouble installing Guest Additions within the Fedora 13 Guest on a Linux host. I had to mount the vboxGuestadditions.iso from the Device --> CD/DVD Devices menu. Then I located the appropriate package for my system. In my case it was the AMD64 Linux version.I ran this as administrator in Terminal. I used the "bash" command followed by the package name. This was after CDing the the appropriate directory. The packaged installed, I then rebooted and it worked fine. (Something that would make this easier is to load a script into nautilus that would allow me to open a locatation as administartor at the open window. I'm sure there is something in Fedora to do this but I couldn't find it in a hurry so I used the command line way).
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May 17, 2010
I have upgraded to Lucid, but was having the same issues on Karmic. I made a 2nd user acct we'll call X and we'll call the original acct Y. All of these issues only happened after creating X.
On X I have: sound Things wrong with X: I don't have the ability to modify any folders (even ones that are made from X's acct), I can't change the password or even access the Users and Groups, I can't modify any browser settings in Firefox but can on Chromium, the option for wireless is completely gone
On Y I have: the ability to access users and groups, the ability to modify all folders on either acct, the ability to change any settings on anything Things wrong with Y: no sound (doesn't even show the driver, but the driver is there on X's acct), wireless is completely gone (just like X's acct), even though I can access Users and Groups I cannot modify anything about X's acct
My first thought was to completely delete X since that's when all the problems began, but I'm afraid that since X seems to have "stolen" my sound card, that will be lost forever. I am also afraid that since neither account has wireless deleting X might hinder ever getting it back.
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Apr 8, 2009
I have a windows 2003 active directory and dansguardian transparent web filter. I want that dansguardian filters according by whom is logged on the workstation. Can this be possible?
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Feb 21, 2011
I am looking at creating two user accounts for "contract system admins"..These guys will be performing sys admin duties for a sever -- however, I am still concerned about security of data. For example, the server contains password information for our database, etc.Besides making them sign an NDA, etc. what other security mechanisms could I put in place to ensure that they don't just go buck wild. For example, when someone makes a sudo command, is this logged?
what are some recommendations for general security practices?
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Mar 3, 2010
I want to use AD sys accounts to logon to linux servers. What is the best and most secure way to do this. This because we want to ensure it is tracable when a server administrator makes changes to a linux server. Now we use root to make changes to the servers.
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Jun 14, 2010
i have found this xor encryption program
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_SIZE 256
[code]....
Its working fine, it can encrypt and decrypt. but how strong is it ? is it all depending on the specified key ?
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Sep 8, 2010
I recently received an email from a friend without subject and just a link. Since we do that a lot, I clicked on it. I was taking to a website that looks like a phishing site and my computer hard drive started working feverishly. I closed it quickly.
First, I want you guys to be aware of this thing since it seems to be fairly new.
Second, I want to know if I have been compromised. I already changed the password on my gmail account and I accessed the site using Ubuntu and Firefox.
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Nov 26, 2010
allow sftp access to my Ubuntu system (happens to be desktop as it's also my main system) using accounts that are not able to login normally. (I have already managed to create such accounts.) These accounts need to be chrooted (also already accomplished with the openssh daemon settings.) Where I run into problems is that I want to give them (read only) access to files outside the chroot (on another partition in fact) and the matter if made more difficult because the directories to be shared are on NTFS-3G partitions (as they are a shared linux / windows storage drive). Is this possible and if so, what do I need to do?
Edit - Forgot to include versions
Ubuntu 10.10
openssh 1.5.5p1-4ubuntu4 (the one that comes with 10.10)
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Apr 5, 2010
I would like to restrict a few selected accounts to minimum of 15 characters passwords. Other accounts,however, should still be able to login with 8 character passwords. This is in RHEL 5. Does anyone know how to go about it? I have checked PAM documentation and pam_cracklib.so has an option minlen. As per its documentation, minlen can force users to use 15 characters, but it forces every account on the system. I might be wrong too.
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Jun 8, 2010
I am trying to disable accounts after 5 unsuccessful login attempts. I am following the guidelines in this article:
[URL]
This is on an Oracle Enterprise 5.4 box, which is essentially RHEL 5.4 Here is what my /etc/pam.d/system-auth looks like:
--------
#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
[code]....
Unfortunately, the account does not seem to be locked or disabled. As root, runninng 'su test2 -c <some-command>' always sucessfully runs <some-command>, and leaves the failed attempt count at 6. /etc/shadow does not have an * or ! anywhere in the encrypted password for the 'test1' user.
What am I doing wrong? I thought that with the max attempts set to 0 in faillog, that the deny= parameter would be used. I thought I should be using su <user> -c <command> from the root account to test if the disable feature is working.
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Feb 20, 2011
I am looking for some software (not Tryecrypt) where I can just right click a file and it will encrypt it for me. It would be nice to unencrypt on Windows but not essential.
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Mar 11, 2011
Is it possible to have two passwords associated with one account, one that is the actual one, and another one, a duress password, that upon entering gives a similar (desktop) environment with "decoy data"?
The idea is to have the bogus password go to an encrypted home drive that looks as if it were the real deal, but it is wiping particular sensitive (encrypted) data that is visible only with the real password in the background, so that the actual data that need to be protected are not compromised. While the person who unlocked the computer tries to find the information on it between all the rubbish files, the real files are securely wiped. The files are very sensitive in nature, so it's better to have then destroyed than have unauthorized people access them, in the event of that happening.
I happen to know that TrueCrypt has a similar option but that requires an entire decoy operating system (and I think that might be a bit conspicuous), but is there a native linux way to do it?
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