Editing
Howto HostAuth
From Linix VServer
Jump to navigation
Jump to search
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
== What is this? == nss_vserver is a nss authentication module for linux-vserver powered systems which allows processes running on the host (sshd, getty) to authenticate users that exist on guests. The module should almost transparently drop in to a modern Linux system: PAM would call its pam_unix module, which would in turn look through the nss modules to complete the process. If you want to complete the guest login process, you should also get a modified version of vslogin linked to below. vslogin will pick up after authentication and deliver the user to a shell on his guest. Note that with nss_vserver you don't need the syncshadows included in the vserverauth tarball. == Why would I use it? == Using nss_vserver and vslogin you could run a single instance of sshd on the host. This host-based server would verify the credentials of a user on a guest and then vslogin would take care of presenting the user a guest-based shell. == Installation Instructions == 1. Get the appropriate version. On x86 versions you need to use the pthread version, on amd64 (and possible x86_64) you need the cthreads version (listed as nss_vserver_64). Also, on amd64 it's in /lib/, not in /lib/tls/. 2. On linux, just run make install * Note: on recent kernels test passes, but you unable to login via ssh. To fix that problem: 2.1. edit /etc/nsswitch.conf, remove "vserver" from "group:" line 2.2. Add into /etc/group line "vserver:x:9999:" 3. After, try to run make test To see if it works. == How to remove it from system? == Just run make uninstall == Use with vslogin == After you have installed module, (and have vslogin copied to /sbin/ and suid-root) you are ready: try to login into a guest, say one named "test" with user "user", by loggin in into the host with username "test-user" or "user@test." You should find yourself logged into the guest. Note: vslogin requires vservers root too be at /vservers, so make it as symlink to your location. For example, for debian systems need to do ln -s var/lib/vservers /vservers == Caveats == === Security === WARNING! If you have installed vslogin, NEVER give shell access to your host to users -- any user on host, who able to execute programs and modify environment will be able to log into guests as anybody he wants! === Usernames and guest names with dashes === Avoid using usernames or guest names with dashes. The current version only tries one configuration while searching for the user in guest databases, which can cause problems: * User "user" on guest "ser-ver" when written as "user@ser-ver" will work fine, while "ser-ver-user" will be threated as user "ver-user" on vserver "ser". * User "us-er" on guest "server" when written as "guest-us-er" will work fine, while "us-er@guest" will be threated as user "er@guest" on vserver "us". If you must have dashes, use the syncshadows method instead. == Download links == nss_vserver: http://dev.call2ru.com/vs/nss_vserver.tar.bz2 nss_vserver_64 (for use on 64bit systems): http://dev.call2ru.com/vs/nss_vserver_64.tar.bz2 modified vslogin: http://dev.call2ru.com/vs/vserverauth.tar.gz == Authors and copyright == nss_vserver was written by Anton Fedorov <datacompboy@call2ru.com> 19 march 2006 and is public domain; feel free to use it as you want. vslogin was written by Alec Thomas (http://swapoff.org/LinuxVServer) == Troubleshooting == vslogin:chroot: No such file or directory indicates that vslogin can't access the vserver set in the GECOS field (i.e. you possibly have a typo in the GECOS field). [[Category:HowTo]]
Summary:
Please note that all contributions to Linix VServer may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see
Linix VServer:Copyrights
for details).
Do not submit copyrighted work without permission!
Cancel
Editing help
(opens in new window)
Navigation menu
Page actions
Page
Discussion
Read
Edit
History
Page actions
Page
Discussion
More
Tools
Personal tools
Not logged in
Talk
Contributions
Create account
Log in
About
Overview
Paper
News
Developers
Donations
Search
Getting Started
Downloads
FAQs
Documentation
Support
Participate
How to participate
Report a Bug
Communicate
Teams/Projects
Hall of Fame
Resources
Archives
Recent Wiki Changes
Pastebin
Related Projects
VServer Hosting
Happy VServer Users
Tools
What links here
Related changes
Special pages
Page information