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Questions tagged [ssh-keys]

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an authorization mechanism for SSH involving public-key cryptography.

801 questions
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1 vote
1 answer
90 views

How do I enable Google Authenticator (TOTP) with SSH keys with a passphrase on Debian 12?

TL;DR: I ran google-authenticator when logged in as the root user. I should've run it as my normal user account instead. I have just installed Debian 12 on a spare Apple Mac Mini. I want to control it ...
ZPMMaker's user avatar
ZPMMaker
  • 21
0 votes
2 answers
128 views

Creating an ssh keypair for AWS Lightsail/EC2 instances doesn't work as expected

I've created a fair few SSH keypairs in my days but AWS seems to handle them differently. I'm using AWS Lightsail and it has a notion of 'default' keypairs. This is fine for the 'normal' user that AWS ...
Alistair Ross's user avatar
Alistair Ross
  • 1
1 vote
1 answer
252 views

Even if SSH is set up, it always asks for the password when logging into the server

I have an Ubuntu server. I use ssh to access it. It worked fine at first. When user@IP is given along with SSH key, it will log into the server without asking for password. But recently, even with SSH,...
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Sachintha madhawa
  • 11
0 votes
1 answer
198 views

ssh from CL using keyfile from Windows client to Linux server

This sort of thing drives me crazy - hopefully obvious solution(s). Have keys on Win 10 laptop, and on one of my Linux servers. If I use puTTY, where I can explicitly browse to the keyfile on the ...
Johnny Canuck's user avatar
Johnny Canuck
  • 151
0 votes
1 answer
2k views

userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms after upgrade of OpenSSH

After an upgrade I can no longer log in to my box (FreeBSD 14.0) using RSA key getting: userauth_pubkey: signature algorithm ssh-rsa not in PubkeyAcceptedAlgorithms in /var/logs/auth.log on every ...
sophros's user avatar
sophros
  • 111
2 votes
0 answers
317 views

Server host key changing frequently

Im trying to connect to my ubuntu server via ssh from Windows. Unlike my another ubuntu server from same dedicated server hosting, the server host key changing frequently. I get WARNING: REMOTE HOST ...
Mreza Nemati's user avatar
Mreza Nemati
  • 21
0 votes
1 answer
95 views

Is there a solution to manage users in some systems or at least in linux?

I work somewhere with a lot of Linux and VPS servers. When someone joins the company, other staff members need to add his SSH key to each server; conversely, if someone leaves, all of his SSH keys ...
Mohammad Mahdi's user avatar
Mohammad Mahdi
  • 29
0 votes
0 answers
64 views

Custom Linux AMI: How does AWS know where to install account SSH .PEM files when an AMI is provisioned?

We are building a custom AMI from a template EC2 EBS instance snapshot (Oracle Linux 8). This page shows there are many different user names depending on the AMI you choose: https://docs.aws.amazon....
KJ7LNW's user avatar
KJ7LNW
  • 161
1 vote
1 answer
226 views

Remote Linux server GitHub permission denied publickey issues

I am experiencing publickey permission issues when trying to pull a private repo from GitHub to a remote Linux server. Update Ran ssh -v -o IdentitiesOnly=yes -i ~/.ssh/id_rsa [email protected] command ...
Mike Hermary's user avatar
Mike Hermary
  • 141
0 votes
0 answers
193 views

How safely obtain and check host public key for `known_hosts`?

For a newly deployed instance I get the following message for the first time SSH connection: The authenticity of host '[hostname] ([IP address])' can't be established. RSA key fingerprint is [key ...
Eugen Konkov's user avatar
Eugen Konkov
  • 228
10 votes
4 answers
5k views

How do I prevent users from messing with their own .ssh folder?

I'm administrating a RedHat server where users log in through SSH with private/pub key based authentication. I'd like to prevent them from accidentally changing / deleting /chmoding the content of ...
wecx's user avatar
wecx
  • 203
4 votes
2 answers
1k views

How to prevent OpenSSH from creating a new known_hosts file every time it updates it?

It seems that every time I accept a new host key, ssh (I've tested 8.6p1 and 9.3p2) does the following steps: Move the known_hosts file to known_hosts.old; Create a new known_hosts file; Copy the ...
N.I.'s user avatar
N.I.
  • 143
1 vote
0 answers
163 views

Can not SSH to GUI Ubuntu on Login Screen

I have a laptop with Ubuntu installed, and I've set up SSH using a key, and everything was working fine (I could SSH into the laptop from another computer). Then, I rebooted the laptop, and on the ...
Thuannb96's user avatar
Thuannb96
  • 11
1 vote
2 answers
1k views

How to remove all lines with the same public key from known_hosts?

Let's imagine the following scenario. I have an host key ABCDEF1234 for a given hostname, so my known_hosts file looks like this (unhashed version): example.com ssh-rsa ABCDEF1234 Now I connect to it,...
shodanex's user avatar
shodanex
  • 242
0 votes
1 answer
81 views

Home directory, user database and key-based authentication

I want to share it NFS share with my users just like the home-directories (traditional way), but I don't want to create the users instead I want to get the server integrated with the github or google ...
AAB's user avatar
AAB
  • 13

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