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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May 24, 2010
Is there a way to use kerberos (or baring that a trusted CA) to allow users to ssh across machines in an environment isntead of having to manage the hash keys per user/server? I'm using kerberos+ldap to log folks in and get their settings but I'd like to take it a step further. I've been reading a lot but still can't quite get it all to come together.
Do I need to create a SPN for each host to do this? Sorry if I am asking a dumb question, I am returning to the *nix fold after a decade+ in the Microsoft world, be gentle with me.
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Feb 13, 2011
Trying to setup a Kerberos + OpenLDAP server to manage users for our Samba shares (was going to use just OpenLDAP, but apparently it is less secure than using Kerberos with it). (Distro: CentOS 5.5) Haven't even gotten to the point of connecting either to Samba yet. I have set up a Kerberos server, and configured it as necessary. I am happy that it is working as intended, as I can login and manage principals from both the local terminal and remotely on other clients.
I have setup a server (sv1.myhost.net), and configured it to talk to Kerberos (auth.myhost.net). I have created both a [URL] principal, and a testuser principal. I have set the password on the testuser but not on the host/sv1.myhost.net. I have added the keys for both users to the keytab file on the sv1.myhost.net. I am at a Windows 7 machine (on the same internal network), and have installed the Network Identity Manager. It is able to request a ticket successfully for the testuser account.
When I use putty w/GSSAPI (0.58) to remote login to the system, it says using 'testuser' and then just hangs there. Eventually putty connection times out. The fact that both machines can connect to the auth server to communicate with kerberos correctly suggests firewalls are correct. The relevant entries in sshd_config have been uncommented to tell srv1 to use Kerberos authentication.
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Feb 19, 2010
I am trying to deploy Kerberos and LDAP so users will be able to login in to a server on the edge of the LAN, and afterwards be able to establish a SSH connection to all the computers in that LAN without the need to type any passwords, and without the need for me to manage SSH keys [beside the SSH keys on the login server] and local user accounts.
1. When i create the users in OpenLDAP i use a template that i created by reading documentation from the Internet. In the template one piece of information that is neede is the UID. Is there any clever way the keep track of the numbers so i do not assign the same UID to two users, besides using a pen and paper?
2. For the users to be able to establish SSH connections between the computers, the host is going to be added to the keytab like this: ktadd host/client.example.com Is is possible to replace client with something genric so i do not need to mange these keytab files between the hosts?
3. Users will be logging on the the server on the edge of LAN by using SSH keys. How can i configure the setup so the users will recieve a ticket automatically when the logon without executing kinit and without entering a password, just by having a valid SSH key?
4. krb5kdc is running on all the network interfaces in the server i want it to only run on eth1, how can this be done?
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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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Mar 6, 2010
I'm wondering if anyone can give me some guidance, or point me to a relevant reference for setting up a single purpose ssh key.I have setup a single purpose key for rsync, where I have command="/path/to/rsync-secure" associated with the public key in .ssh/authorized_keys, and the rsync-script checks to make sure incoming commands begin with 'rsync --secure', What I would like to do is do something similar to allow sshfs access, and have the server path that can be mounted locked down to a particular location. Does anyone have any suggestions as to how this could be done?As an aside, I might also want to restrict the above rsync script to only allow synchronization to a particular path.
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Apr 21, 2011
I am integrating my Unix box to the Windows AD using PAM_LDAP and Kerberos enabled. I was wondering, since Kerberos is enabled is there any point to enable SSL on my LDAP.conf? My understanding is that since Kerberos is enabled, therefore the username/password is sent securely there isn't any benefit of enabling SSL on the LDAP.conf? It's one of or another.
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Jul 17, 2010
Is it possible to secure samba server with kerberos? I want to know whether we can use kerberos authentication to secure samba user name and password so that mo one can sniff that information. configuration or any URL link from I can get the exact configuration.
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Jul 12, 2010
I have Ubuntu 10.04 configured to login with Kerberos (as in [url]). Everything works fine, except gnome-keyring-daemon:
-If I login with a local user, gnome-keyring-daemon works right. Besides, the keyring is automatically unlocked with the login password.
-If I login with a Kerberos user:
- The session startup is considerably slower.
- /var/log/auth.log says something like:
Code:
- If I execute a program that needs the gnome-keyring (like Evolution), is desperately slow, and it says:
Code:
Message: secret service operation failed: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
- If I kill all gnome-keyring-daemon (killall gnome-keyring-daemon), start a new one (gnome-keyring-daemon), and restart the application that uses the gnome-keyring, it works fine, but it ask me for the password to unlock the keyring (I think that this is the normal behaviour if gnome-keyring-daemon did not start before).
I have seen the configurations in /etc/pam.d and everything looks fine (with pam_gnome_keyring.so). Indeed, I think that if something was wrong here, the local user would not have the keyring unlocked automatically.
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May 13, 2011
I'm trying to login to a server using gssapi-with-mic authentication against one of my school's machines that supports this mode of authentication. I have these kerberos packages installed:
batrick@menzoberranzan:~$ dpkg -l | grep krb
ii krb5-config 2.2 Configuration files for Kerberos Version 5
[code]....
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Jun 3, 2010
I have installed keberos on my suse machine, but after installation now I am not able to login in it even with the root password. I search over the internet but could not find the solution. What to do now and how to configure Kerberos on a local machine with only local users authentication. I mean client and server both are on the same machine.
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May 30, 2010
I don't care so much the practicality and needlessness of actually setting up a computer for proxy server for personal usage, but none-the-less, i want to do it, and i'm just wondering about hardware.The proxy, i don't intend on having a desktop environment, so it'll be a terminal interface.But for a system that will handle traffic for 3 pc's and a ps3, how much hardware would one suggest i need, as far as RAM, HDD space, so on and so forth.
I was thinking it would be fun to do with with my old amd k6-2 processor and it's 32mb of ram, but in order for that pc to work, i'll need to replace a few hardware pieces, and before i dumb money into it and pull it out of the closet, i want to find out if it would even be worth my time to do it.
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Aug 23, 2011
I can't forward my kerberos credentials to a computing resource before connecting to the resource for which I have kerberos credentials. In other words, from my machine at work I obtain my ticket with kinit -f to a computing facility off in some lab somewhere.
Then, I want to ssh to another machine in another department (I don't have control over the krb5.conf file or this would have been easy) where I work. It is on this machine I want to be able to ssh,scp, etc to this far off lab. I've tried several options around this barrier, but I'm a total failure thus far. I checked that GSSAPIAuthentication is set to yes.
[Code]...
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Jan 15, 2010
I have a Kerberos/LDAP/OpenAFS server running on Debian lenny, set up according to Davor Ocelic's excellent guide here (url). SSHd has ben configured to use GSSAPI auth and the clients have been configured to pass auth tokens through to the server.
My clients are all Ubuntu 9.10 x86 fully patched. On the clients, OpenAFS has been compiled and installed as a kernel module and git 1.6.6 has been compiled from source and installed. Otherwise, all software is stock Ubuntu repository-ware.
The setup is working fine as long as I connect to the primary server using its hostname:
peter@client01:~$ ssh nana
<connection goes through seamlessly without prompting>
peter@nana:~$
If I try to connect via a DNS alias (actually a second CNAME record), I get:
peter@client01:~$ ssh git1
peter@git1's password:
<connection completes>
peter@nana:~$
I need both passwordless auth and the DNS alias working, as it's internal policy that user connections are only ever made to service names, not real hostnames.
I have tried adding a second host principal to Kerberos for the alias (git1.darling.local) in addition to the host principal for the hostname (nana.darling.local).
If I turn off PasswordAuthentication in sshd_config, then "ssh git1" doesn't even fall through to passwords; it just denies logins. So it looks like it's not even using GSSAPI for the DNS alias.
So:
1) Is what I want even possible? I can't find anything that indicates that there's anything odd about DNS aliases such that this should happen.
2) Which config files should I post to help debug this? There's a lot and I didn't want to start blarfing them here if they aren't helpful.
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Dec 10, 2009
I wish to setup a network that works like windows but for with lunix of course!. It will need to be able to handle security/DNS/DHCP & Document store from one location. I've been doing some reading and have found that I think I need to be using one of the following:
LDAP
NIS
Kerberos
I have looked at a few Linux based OS's. I did notice that when you install fedora live desktop it gives you the option to connect to one of the above. So I am looking for a complete solution.
1. How to setup fedora to act as server for my needs (or other Linux build)
2. Add fedora/linux mint machines to server to use new security settings. (or other linux build)
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Dec 14, 2010
I'm tasked with creating a base image of ubuntu (one for server, one for workstation) that is locked down and has all the fluff taken out (naturally workstation will have more fluff left in it than server). Task list looks about like this:
1. Create list of deb packages "allowed", write script to list/uninstall everything else.
2. Hook the logins into either enterprise kerberos or Active Directory (yuck).
3. Write scripts to check things like setuid/setguid, disabling su, checking sudo permissions, configure iptables, etc.
4. Use a scanner to scan the system from outside the system (was thinking of using backtrace).
5. Custom-compile the kernel to strip out all the unneeded modules.
Before embarking on this awesome task I figured I'd check with you guys to see if you know of some resources that would make this task easier/quicker. I'm sure someone out there has already headed down this branch.
PS My boss *loves* ubuntu and isn't to keen on going with a deb (or other) distro that is already "security trimmed" without some serious convincing. I'm sure there are some out there, and if you want to pass along a couple for consideration, I'll check them out, but no guarantees he'll let me use it.
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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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Jul 14, 2009
I have a new server with Fedora 10. The root user can log in by SSH using an RSA key but for any other user the RSA key is ignored and a password required.Ultimately I wish to access an SVN server over SSH and would like to to have to keep entering a password. I have Googled this issue and found nothing.If I log on as root the /var/log/secure file shows that the key is accepted, for any other user no message is added and the password is requested.I have checked all the config files and as far as I can see they are all correct so I am at a complete loss as to why SSH will not use the users RSA key.
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May 24, 2011
I want to restrict some of my Operating System users running unwanted commands. I just want them to run specified commands only. How can i achieve this?
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Sep 19, 2010
I'm on Debian 5 - when I run the w command, it reports 2 users, but I'm the only person logged in. Is this cause for concern?
Code:
curos@histeria:~$ w
16:17:25 up 4 days, 11:56, 2 users, load average: 0.00, 0.00, 0.00
[code]....
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Feb 6, 2011
OS: Fedora 14 i386It's used as a ""normal desktop laptop""."USER A" - it's the mainly used user, i log in with GDM with it, etc.Goal: I need a little more security - separate a few apps!How: run 3 applications ( Transmission, Google Chrome, Wine ) with other users ( so not with "USER A" ). But when i'm logged in ( in GUI ) with "USER A", i need icons on he's the Desktop. E.g.: just one click ( without asking for password!! ) and Google Chrome starts with another user.How exactly can i do this? - How can i "grant" "USER A" with permissions ( securely ) so that it doesn't needs a password, when running applications with "USER B", "USER C", etc.?
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Apr 14, 2010
I've installed Ubuntu Desktop Ed 9 and I want to add a user account that would be very restricted. I would only want them to access the internet and run several programs. I do not want them to have access to the destkop, anything under preferences, administration etc... Is this possible?
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May 13, 2010
I'm currently running tests on my SAM file on my XP partition. Partly because I want a password that is hard to crack, and also out of curiosity. While running John the Ripper (no options used) I'm noticing that there are 8 pasword hashes, yet only 4 users associated with WinXP. I know that JTR only does 7(?) characters when it check for a solution. Is the 8 hashes because it separates passwords longer than 7 into 2 hashes, and then cracks them individually as 2 parts? I did try googling this,
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Jun 9, 2010
I created a new user desktop user for my girlfriend to use my netbook, but when she logs in, it doesn't show the wireless network icon. Under users and groups, I gave her access to wired and wireless networks, and under the network settings,I changed our wireless to "available to all users". I'm not sure what the problem is here.I'm using ubuntu netbook remix 10.04.
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Aug 30, 2010
I need to be able to capture a users password when they login. I am well aware of the security issues with this and I'm ok with this.
We run a call center and I am working on migrating from windows to Kubuntu for the callers. It's policy that all callers must report their password to me, so I already know of everyone's password. There has to be some variable/script that I can "hack" to get the password they typed in to the login screen.
What I'm trying to do is that when a user logs in in for the first time, their profile is automatically created and set up. Setting up network drives, email, pidgin (which the password is stored in plain text anyway, so forget about security on that one), web apps, etc.
Trying to find information on How to capture a users password and all have been responded with the usual lecture on why you shouldn't do this. So I've heard it all before and I know of the risks. Like I said, I already have the callers password on file. If I could capture it, I wouldn't have to manually setup each profile every time we get a new caller, which is often since turnover is quite high in call centers.
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Jun 10, 2011
I set the profile for Firefox to enforce sudo aa-enforce firefox.Does this now apply to all users on my system or just the user I was logged in as?
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Oct 12, 2010
is that possible to have multiple users for one linux session? and how can i do that ? it's possible to creat virtual users for a session ?
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Mar 26, 2011
I just realized that I can access other users files and they can access my files simply by using the console to navigate the file system, Its not that big a deal, I am the only one using the computer but this seems like something is not configured correctly. Should each user be able to look at and modify each others files by default? (On Xubuntu 10)
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Jul 22, 2010
I'm using Fedora 10 as a proxy server using squid, but I recently noticed that some users use the IPS's Dns to bypass the proxy and surf the web freely. So my question is, is this a problem with Squid or perhaps I can solve the problem whit IPTables.
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Jul 26, 2010
I need to create a number of internal Linux users for admin purposes. I do not want these users to appear on the initial console login page just after Fedora boots up, as users who can attempt to log in, and I do not want to allow these users to log in directly. I merely want these users to be accessed via su, just like the root user.
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