So I've a VM that has SSH login. In this machine I only want one user ( lets say admin) to be able to login in via SSH.
Ive changed the sshd_config and added the AllowUsers admin directive. The problem is that I can still login to the machine with the user user, for example.
The host is a Ubuntu server and I'm accessing it via vSphere Client.
Is there anything I'm missing here?
Related
I have setup my LDAP server with user details. I have setup my Ubuntu laptop to authenticate users from LDAP. The problem is, every time user tries to log in, Ubuntu tries to reach LDAP servers to authenticate. So when network connection is out, it shows authentication failed. What I want is when user logs in first time, Ubuntu authenticates from LDAP, and creates a local user profile, and stores credential somewhere on local. So when network connection is not available, it authenticates against last used credentials. And when system connects back to internet, it authenticates against LDAP.
Please help me with this. Let me know if any clarifications are required.
I have created LDAP Server, and my ubuntu system is already authenticating users against LDAP. I want to store the LDAP credentials to a local user once the user logs in for the first time, so that these credentials can be used for authentication when network connection unavailable.
If you are using SSSD as the LDAP client, enable its built-in credential caching. Take a look at options cache_credentials (for auth) and cache_first (for account information) in the sssd.conf(5) manual page.
If you are using nslcd as the LDAP client, install pam_ccreds for authentication caching and nscd for account information caching.
I'm hosting my file server on GCP debian 10 virtual machine and I want to create passwordless user so people could publicly download files from his home directory.
So I created new user, removed his password with passwd -d username, changed /etc/ssh/sshd_config file so it would allow this exact user to login with empty password and set chroot jail, restarted ssh service.
Unfortunately, when I'm connection via ssh into this user it still prompts me with a password.
This setup was working on the old server, configs are definitly correct and user definitely does not have password. I guess google implemented some additionl protection that dosen't allow me to do what I want.
Maybe someone had already bumbed into the same problem before?
I reached the support and they said google doesn't support passwordless ssh connections.
We have a Linux Server with 2 users user1 and user2. We have to login from user1 to user2 via ssh such as:
ssh user2#<computer-name>
Both users are on the same server. However, user1 is an automated script where we cant type in manually the password and we dont want to store the password. Therefore, we want to use an ssh key (private to user2 and public to user1).
Thereby, the traffic should not go via the network as it has already a high load. The question is: will be the network connection automatically always via the localhost? If not how to force ssh to use only the localhost?
Are the two users both on the same server ?
If you are on the same OS, you can use to switch between users :
su user2
More details here : https://unix.stackexchange.com/questions/3568/how-to-switch-between-users-on-one-terminal
I have a case on my Ubuntu Linux 16.04 servers that I need your help with:
Current Scenario
A valid AD user logs in to the Ubuntu Linux server via SSH
That user adds his public key to ~/.ssh/authorized_keys for passwordless login
I disable/lock/delete the AD user to prevent him from logging in
The user was still able to login to the server, since his public key is still there!
Expected Scenario: If I disable/lock/delete a user's AD account (or his AD password expires), he shouldn't be able to login to any server with his AD account, even if his public key is installed there.
I have hundreds of servers, and it would be very difficult to track all the installed public keys.
Any solutions or workarounds for this without disabling PKI completely?
Note: I use PBIS Open to join my Linux servers to the AD domain.
The solution is to add this to /etc/ssh/sshd_config:
AuthenticationMethods "publickey,password" "publickey,keyboard-interactive"
This will require public key and then will ask the user to enter his AD password.
I need to allow certain users limited access to the lab server. The server is RHEL 5.6. However, I don't want to give them the root access. Basically, we have configured a LDAP server where all the users have centralized NFS and LDAP login from any of the client machines in the network. So, the LDAP users home area is located in /home/users in the server. I need to give access to only this folder to a certain user.
If I edit the visudo file and add the following line in the RHEL server, will I be able to accomplish what am looking for?
user1, %operator ALL= /home/users
When you are authenicating users with ldap and nfs mounted share, as such users of ldap or without ldap would be restricted to work in their home directory only.
Thanks & Regards,
Alok Thaker
Basically, as you giving all users access as users not as root hence all users will not have root access either using local authentication or remote authentication. I hope the users don't know your root password. :)
SUDO is used only when you want to give some users privilege to run the command as root like a normal user will not be able to do the command "service network restart" but if you allow the user have sudo privileges, he will be able to do it.