Ubuntu Networking :: Remote Authenticaiton / Login ~ LDAP - Kerberos?
Jul 27, 2011
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.
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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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Sep 8, 2009
I installed CentOS 5.2 and then run yum update. I configured this server as LDAP/Samba primary domain controller. LDAP seems to be OK and for testing I am able to create users with:smbldap-tools useradd -am usernameI can ssh into the server as root and also as a Linux user which was locally created in the server. But ssh into the server as LDAP user fails (from a Fedora 11 machine) with "Permission denied, please try again", prompting again for password.Some data:
# rpm -qa | grep ldap
python-ldap-2.2.0-2.1
php-ldap-5.1.6-23.2.el5_3
[code]....
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Feb 7, 2011
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?
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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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Apr 21, 2011
I 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?
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Jul 29, 2010
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?
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May 26, 2011
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.
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Apr 23, 2011
we'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...
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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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Aug 9, 2010
why i can't login on the ldap-client via ldap, so here is a short description of my machines (i use openvz virtualising)I have on the HN (Debian Lenny) 2 VE's, which are in the same subnet (192.168.1.0/24)The first VE (Hostname: ldap1, IP: 192.168.1.91) is the ldap-server, which is so configured, that i can manage the server via phpldapadmin.The second VE (Hostname: ftp1, IP: 192.168.1.31) is the ldap-client, there should run a sftp-server in the future and the sftp-server(ssh-server) should use ldap-usernames to login. on the ftp1, i get with this command getent passwd the users configured on the ldap-server, but with the command id USERNAME the result is, that the user doesn't exist. (USERNAME is this name, i get returned by getent) and if i try to login via ssh, i get permission denied. and because the machines are openvz-virtual-machines, so i can't login on them like on a normal system, but a su USERNAME doesn't work too, because the user is not known on the system.
my installation:
i don't think, that the ldap-server is the problem, because the phpldapadmin and getent on ftp1 are working perfectly, but if you want, i can post the config here too. the VE ftp1 was configured with the following how-to: [URL] and pam is configured like in the chapter "PAM setup with pam_ldap" on [URL]
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Mar 24, 2011
Following the instructions listed here:[URL].. I have a machine set up to use Kerberos authentication for logins. The problem is, logins are now incredibly slow and any user from the AD fails to log in.Here's the output from the server in debug mode:
[Code]...
What I want to do is use a Windows AD with the UNIX extensions to control user logins on CentOS 5.5 servers. Previously I've used OpenLDAP and AD, but that was still two separate auth methods and I just want one.
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Mar 10, 2009
I have an NIS server that is working well, and I want to use Kerberos to improve the overall security.I have already installed Kerberos client and server on two machines respectively.Currently the NIS server, Kerberos server, and KDC are running on the same box, and every box is in the same private network.I am having trouble logging in using the user account defined in Kerberos database. Here's /etc/krb5.conf on the client side:
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
[code].....
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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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Oct 20, 2010
I'm setting up kerberos and I can't login with kadmin but I am getting tickets with kinit, my princs are valid, and my dns resolves with dig/ping, am I missing something?:
kadmin:
Code:
home-plug:/home/steven# kadmin
Authenticating as principal root/admin@SOUR-LAN.LOCAL with password.
Password for root/admin@SOUR-LAN.LOCAL:
kadmin: GSS-API (or Kerberos) error while initializing kadmin interface
auth.log
Code:
Oct 20 22:18:13 home-plug kadmind[8935]: Seeding random number generator
Oct 20 22:18:20 home-plug krb5kdc[8778]: Interrupted system call - while selecting for network input(1)
Oct 20 22:18:20 home-plug krb5kdc[8778]: shutting down
Oct 20 22:18:20 home-plug krb5kdc[8939]: setting up network .....
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Aug 9, 2010
I'd like to know if network-manager applet could be run on gdm login menu. Cause i would like to get connected on my network to reach kerberos serveur to login. nm-applet on gdm
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Feb 12, 2010
After reading up about ssh, I understand that it's a protocol used for sending encrypted data over a network. However, I don't understand what's going on when I login to my Ubuntu PC using ssh [over the network]. How does the ssh client application 'know' that it has to take input from one computer and pass it to the other?
EDIT; To put it another way, one could send a mp3 file over ssh right? So instead of the file, what tell the ssh client that the input and output of the computers is what has to be sent?
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Dec 29, 2010
I'm setting up an Ubuntu 10.04 system; installed open-ssh. I'll call this box A. I also have an older box B with Debian. From A I can log into B via the usual way (ssh <user>@<IP>). The 1st attempt at this I was presented with the 'unknown host' warnings & elected to accept it. However, from B when I try logging into A there is no response at all -- no warnings, nothing. I have to ctrl-C back to the prompt. I can successfully ping A from B though. I CAN connect to A from a Windows box using PuTTY as an ssh client with all default settings. Once connected I can log in. Why no response from A when trying to log in from B?
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Jan 11, 2010
F12 64bit
Debian 5.0 64bit
Openssh
Both openssh-server and open-clients are running on 2 boxes. On F12 it is named openssh-clients but on Debian 5.0 openssh-client without "s".
1)As root both boxes can connect remotely another box.
2)As user both boxes can't connect remotely another box.
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Feb 17, 2010
I have 2 computers with kubuntu 8.10 using vinagre for my remote desktop viewer and x11nc for my server and I am trying to connect remotely through the command line from one computer to login to the startup screen in the other computer. Is this possible, since it looks like my server does not start until after I log in to my desktop screen?
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May 31, 2010
I'm trying to set up a Linux server and I am new to this. I have gone through most of the configuration using SAMBA 3.0 and when I populate the ldap directory all I get this error before the password request:
Then when I perform an ldapsearch to see if the directory is populated I get this message:
I'm positive all my .conf files are done right.
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Apr 14, 2009
I am using VNC to login to remote machine (vncserver). My question is; How can I login to remote machine (vncserver) through VNC client, without having to login to vncserver first physical. For better explanation here is an example: If john wnat to login to vncserver remotely first he has to login the vncserver physically then he can login remotely.
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Feb 6, 2011
I maintain plain vanilla Ubuntu 10.04 systems for several friends. Each machine has only one user, the owner. I use Remote Desktop to instruct and to perform maintenance. Here's my problem:After updating the system, if the kernel has changed, a restart is needed. If I do a restart, I then have to phone the owner to insert his login credentials in the gdm login screen, before I can do anything else via Remote Desktop on that machine.There ought to be a simple way I can avoid the phone call and login myself.
I'd strongly prefer not to use any software that is not included in a plain vanilla Ubuntu 10.04 installation. And I don't want to weaken system security beyond what it is now.Is there a solution? Or, what is the simplest solution?
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Mar 10, 2011
I try to get authentication working from remote LDAP server (Novell eDirectory)So far I can get correct info from id user or using ldapsearch (so the connectivity is there)But what do I need to configure to get authentication working for SSH login & vsftp login?
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Jun 5, 2011
In the past I found some great help on this forum, so here goes. Bare with me because it's a long story. I'll try to be as complete as possible. I've installed and configured OpenLdap on a virtual machine with ip 192.168.39.134. I've added 2 users via LAM. In the ou WikiUsers and the domain is wiki.local.
I've then created another host with ip 192.168.39.133 with mediawiki installed on it. Then I added the extension LDAPAuthenthication. In the LdapAuthentication file I added this code (only the last paragraph is mine, I added the others to show it's location in the script):
Quote:
$path = array( $IP, "$IP/includes", "$IP/languages" );
set_include_path( implode( PATH_SEPARATOR, $path ) . PATH_SEPARATOR . get_include_path() );
[code]...
I know I'm close because I can't register any new users or accounts on the mediawiki site. Although I could before I added the LDAP service. This is indeed all just to test and get to know how LDAP works. That's why it's all virtual in VMWare. I did not really configure anything on the LDAP, i just installed it and chose a domain (wiki.local).
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Jan 9, 2010
I have Fedora Directory Server with SSL running on my Linux Machine. I can see th output:
Code...
This shows that 636 port is open.But When I am attempting to this Linux Server from one of Windows Desktop it says "LDAP is Down".
I selected LDAPv3 and LDAPv3, hostname and SSL/TLS tried fetching base DN but it dint work.
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May 13, 2010
How can I make the user in remote LDAP server to be used to authenticate Local Linux server ?
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Jun 2, 2010
i'm using OpenSuSE 11.2 and was wondering if there is anyway to set remote login as the default login method.
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Aug 3, 2011
I have a query regarding login to roundcube via dovecot ldap. I have installed and set up the openldap on Ubuntu Server 11.04 with the help of the following article [URL]. I have also installed Postfix, Dovecot, Dovecot-ldap and roundcube as the mail client. Then, I went on to test if I can login through roundcube. I received "login failed". I'm sure the dovecot is running fine as well as Postfix and openLDAP server. All I can find from the log was "auth(default) LDAP: Can't connect to server: localhost".
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Apr 14, 2010
So I was trying to configure my CUPS server and checked the box marked "Use Kerberos Authentication." Now, I cannot change anything and get an unauthorized error every time I try. How can I remove Kerberos? I have access to the local computer as root and can use sudo.
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