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.
View 1 RepliesI am confused with the concept of Kerberos and LDAP SSL. I am in the midst of integrating my Unix box with the Active Directory hence the use of PAM_LDAP method. I understand that since it's non-secure transmission hence We use Kerberos to authenticate. If we already used kerberos to authenticate i.e. it means that the username/password is not transmitted in clear text. Why we still need LDAP SSL? What is the benefit?
View 3 Replies View RelatedI 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)
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?
I've currently got Ubuntu server configured so that clients can login using LDAP user accounts that I've created using ldapadduser (from the ldapscripts package).
I've also got NFS exports working so that /home can be exported to clients. Kerberos authentication is enabled for NFS and clients require a nfs/clienthostname.domain principal to be able to mount the NFS share.
However, I now realise that for LDAP users to be able to access the mount they need their own Kerberos principal. If I run kinit dan@DANBISHOP.ORG then I can access /home/dan as user dan otherwise I get permission denied.
My question then is how best to proceed... is there a way to configure the client/server so that once a client has mounted the nfs share using Kerberos, all users can access it without their own principal?
It seems more usual to create kerberos principles for all users, but then how does one manage users? Using ldapscripts is very easy, but if the admin then has to manually create kerberos principals everytime, it could become very tedious. Furthermore how do users change their password if kerberos is used for authentication?
In the OpenSUSE documentation I red this very exciting chapter Chapter 6. Network Authentication with Kerberos That mentions "Using LDAP and Kerberos" which combined with NFSv4 would give my office net functionality of a M$ Win network.
We are still on 11.2 (we have no win clients at all) and I was testing different setups of 11.4 in VM, but I can't get YaST to configure the LDAP with Kerberos setup (our current setup does not use Kerberos only LDAP). Unfortunately I could not find any meaningful HOWTO on how to do it in SuSE. The page in docs involves editing config files, but I would like to avoid this, because from my former experience with Samba, as it would mean I cannot use yast anymore and that is sad.
Is there a way to configure LDAP + Kerberos (in terms of issuing of krb tickets at login) with YaST?
PS: I basically need Kerberos for NFS and Intranet site.
I have installed servers(10.04 LTS Server) with Kerberos + LDAP, now I can ssh to all those servers and login with kerberos principle. But when I want to change password, I got such error:
Code:
Current Kerberos password:
Enter new Kerberos password:
Retype new Kerberos password:
Password change rejected: Password not changed.
Kerberos database constraints violated while trying to change password.
passwd: Authentication token manipulation error
passwd: password unchanged
I have search this issue but cannot any useful information. Would someone give me a direction?
I am interested learning about networks in Linux and prefer to use Ubuntu. I hope the title is reflects what I really need to know. If not sorry about that.I have an requirement, it is to have a server to handle authenticaition of users so generally users can use that server to use specific services such as login (to linux), mail (postfix) and perhaps a file server (to hold user data, lets say what we have on /home/[username])I did some reading, and it looks like I will need LDAP and Kerberos. But I couldn't get a good understanding on how to practically deploy such a service.I would be obliged if some you guys can give me some guidelines on how to achieve my goal. Topics I need to read, books I could refer would be a plus.To tell you some thing about me, I am not a *NIX guy, my knowledge is kinda just above basic.
View 1 Replies View Relatedwe're running an Ubuntu 10.04 LTS network on our company, authenticating against an Openldap/heimdal-kerberos server.Previously, the clients were authenticating against a Windows 2003 Domain without any problems.After modifying the krb.conf, ldap.conf, nsswitch.conf and nscd.conf files to authenticate the machines against the openldap/heimdal setup, we started experiencing strange problems.
One issue is, for example, the polkit-agent-gnome not starting. This component integrates policykit into gnome. It looks like the agent is unable to start due to some kind of delay with DBUS. Starting the agent manually keeps giving errors until about 70 seconds after login, when the agent can be started without problems. During the delay it is also impossible, for instance, to open the "shut down" menu on the top right of gnome. You can click on the menu, but nothing appears.Trying to start the polkit-agent manually gives these errors (I'll be attaching detailed errors when at work!):
Code:
DBus error org.freedesktop.DBus.Error.NoReply: 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
GLIB ERROR ** default - Not enough memory to set up DBusConnection for use with GLib It really looks like DBus or something related to it is starting "too late" but I can't seem to find the reason. I'm pretty sure this has to do with some timings or whatever in the krb/ldap config files...
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.
As Linux gains in popularity, (as I believe it will), do you think that Linux will ever become the target of as many virus and worm threats as Windows has faced? If so, do you think that the threats will have much success?
View 2 Replies View RelatedIs 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.
View 1 Replies View RelatedI 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.
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]....
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.
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.
View 2 Replies View RelatedI 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]...
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.
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.
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.
I am going through the motions of testing the checkrootkit and rootkit hunter applications on one of our servers. I wanted to get feedback from those who know both as to which of the two is better at 'sniffing' out rootkits. Alternatively, can both be installed without their interfering with the other?
View 4 Replies View RelatedSo, I'm not quite sure what the difference is? Is it that sudo allows you to "borrow" superuser privileges, whilst su allows you to actually log in as superuser? Also, when I sudo [command] and get prompted for a password, after I input it, things work just fine, but if I su, and then get prompted for a password, I can't log in as superuser... Why is this?
View 9 Replies View RelatedI understand the difference between Reject vs Drop for incoming traffic, but are there any differences between reject and drop for Outbound Traffic? Are there reasons to pick one over the other or are they functionally identical when talking about Outbound traffic?
View 6 Replies View RelatedI enabled LDAP from the system>administration>authentication and have not had any luck with it working. I now want to turn it off and log back into my machine normally.
I logged into terminal as root and told it to change the config files back to the previous ones and now it will not let me log into any of my accounts including root! this is via X, SSH and terminal.
If i boot into single user mode and change a users password this makes no different.
Please let me know:1. What LDAP logs are typically available2. How to find them3. How to Parse them
View 3 Replies View RelatedI have a problem with my fedora workstation.I am trying to change my ldap user password through passwd command.When I first create the user on ldap server, I use md5 and create the user password.This is the entry:
Code:
dn: uid=boo,ou=People,dc=linux,dc=gettolandia,dc=org
uid: boo
[code]....
I have a working LDAP-server (I belive!!) I want my laptops to authenticate against the server, when they logon. That works fine as long as the network is present. But I also want the users to be able to log on, when the network is down. When I go to a terminal (without network) I can su to another LDAP-user.I can login via graphical login-screen with the network attached, but not when it is disconnected.
In a terminal id john gives me information about the user john.
My conf. files looks like this:
/etc/ldap.conf
host 172.16.0.138:389
ldap_version 3
bind_policy soft
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I am unable to find any ldap.conf parameter or pam.d/system-auth setting from where i can restrict the LDAP users having uidNumber less than a particular number, say 500 to login into the system.I am using OpenLDAP server and tried pam_max_uid 500 in ldap.conf but it didn't work.
View 2 Replies View RelatedI have been battling with FreeRadius with LDAP backend and Microsofts built-in supplicant. I found on some directions that the certificate you use have to have a EKU(Enhanced Key Usage) with an ODI of 1.3.6.1.5.5.7.3.1 and a Client side Cert with the same except a ODI of 1.3.6.1.5.5.7.3.2. First off, is this still the case in Windows 7/xp?If it is, how do I add that to a certificate with OpenSSL, FYI I am using the ca.cnf/server.cnf under the /etc/raddb/certs directory.Another question, has anyone got the MS Supplicant to work with Freeradius and a LDAP backend? If so can you point me in the direction of some good walk through?
View 1 Replies View RelatedIs there a possibility in openldap to allow a user to only create/manage specific LDAP users?For example user "mailadmin" may only create/manage mail accounts in LDAP that are named like "m1342895"? Or a specific list of user accounts that are in a specific group?
View 1 Replies View Related