Questions tagged [ssh-keygen]
The ssh-keygen tag has no usage guidance.
86
questions
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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,...
0
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2
answers
135
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Why ssh-keygen & ssh-copy-id create files with incorrect permissions
I have a FreeBSD host (sh) that I just set up last week, and it is doing these two weird things that seem to be related:
ssh-keygen ON this host is creating both private and pub keys with 775 file ...
- 179
-1
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1
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371
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Create a pair of keys suitable for DKIM setup using ssh-keygen
Question
What is the right way to create a pair of keys suitable for DKIM setup using ssh-keygen?
Given the corresponding solution with openssl:
# creates a private key
openssl genrsa -out sample.key ...
- 117
1
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2
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711
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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,...
- 242
0
votes
2
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444
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How does SSH host verification for github.com provide any value?
Running git clone [email protected]/repo.git warns me of a potential man-in-the-middle attack when GitHub change their SSH key, and that's cool. I then get the new key by running ssh-keyscan -t rsa ...
- 101
0
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1
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What is the host key (the one from ssh connection) and how is it different from public-private key pair?
The situation is that I've had a VPS created previously. It was all set up, private-public key authentication, root login turned off, password login turned off. Everything was set up.
Then this server ...
- 165
1
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1
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342
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Is it safe to ssh-keygen a "ecdsa-sk" or "ed25519-sk" in a potentially compromised environment?
I'm wondering whether it would be a good practice to make sure the keys are generated in a safe environment, like a live Linux distribution, instead of just generating them in a day-to-day environment ...
- 111
0
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1
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42
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SSH key for 2 client users to 1 server user
If this is a duplicate, I'm sorry.
I have searched my case but I couldn't find the right scenario that resembles my situation, although I thought that this situation must have come up before for ...
- 35
1
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1
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535
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Validate all public keys in authorized_file
In my authorized_file i have multiple public keys against one private key. Now i want to add a task in ansible which will validate that all public keys are valid keys and good for connection. My aim ...
- 11
0
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0
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Create a public SSH key from the private key? Is an `ssh-ed25519` public key unrecoverable?
I want to recover my ssh public key from my private key. I am aware of this answer but it doesn't seem to work for me. When I run the command suggested ssh-keygen -f ~/.ssh/my_key -y > ~/.ssh/...
- 101
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2
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2k
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ssh-keygen unable to verify key "unknown option -- Y"
Context:
I am trying to verify my public key on a Gitea instance. Gitea provides a token for me to generate a signature; The instructions say:
echo -n 'TOKEN_PROVIDED' | ssh-keygen -Y sign -n gitea -f ...
0
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0
answers
171
views
Is there a way to repair SSH On GCP VM after shielded VM failure
I have a GCP VM on which is installed a Docker with Drupal.
e2-medium with SSD 10Go
After increasing the disk size to 20GB, I can no longer access the VM in SSH.
My VM was failing to boot because of a ...
google-compute-engine
1
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1
answer
612
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I used ssh-keyscan in production environment. is it possible to revert back?
I used ssh-keyscan in production environment, after got to know it may allows MITM. I check in known_hosts files, fingerprint is not there. where can i check or is there any option?
- 11
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1
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SSH Key Fingerprint Changes
So I copied an SSH private key from my Linux machine to my M1 Mac. (I've attempted to do this both by uploading the cyphertext to a secrets manager as well as directly transfering the file) but when ...
- 151
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595
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If I setup a 'Passwordless SSH connection' as root user, will it be applied to all other users on the server?
I'm new to the concept of SSH & password-less authentication.
I'm trying to setup password-less SSH connection between two servers A & B, using SSH-keygen.
If I generate the keys on "...
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2
answers
24k
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No such file or directory when trying to create .ssh keys
When I attempt to create ssh keys on my Debian instance :
ssh-keygen -f /home/serverkeys/.ssh/id_rsa
I am getting the error : Saving key "/home/serverkeys/.ssh/id_rsa" failed: No such file ...
- 143
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0
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1k
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ssh-copy-id does not update authorized_keys file
I can't configure ssh key on my Synology NAS.
File ~/.ssh/authorized_keys is not created or not updated.
On remote machine (NAS):
$ cd
$ chmod 700 .
$ chmod 700 .ssh
$ touch .ssh/authorized_keys
$ ...
- 183
0
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1
answer
192
views
DigitalOcean Droplet ssh to use a named key
It's been a while since I've done this and configured ssh keys.
I generated an ssh key with a different file name than id_rsa
I have a DigitalOcean Droplet where I placed a named ssh key pair on ...
- 103
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3
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2k
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SSH asks for password even after i copied the public key to the remote machines
Hopefully, someone can help me resolve this nightmare.
I did a project on vagrant provisioning 4 ubuntu machines, 1 controller and 3 servers.
Created SSH key on controller and ssh-copy-id command to 3 ...
0
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0
answers
1k
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Disabling certain OpenSSH keys on OpenBSD: why the corresponding 'sshd_config' entries are ignored and why 'ssh-keygen -A' generates forbidden keys?
I am trying to achieve the followings on my OpenBSD 6.9 servers:
Forbidding the use of all keys but the ssh-ed25519 one on both SERVER and CLIENT sides.
Limiting ssh-keygen -A to generate keys only ...
- 11
0
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1
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157
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duplicity SSH-RSA key fingerprint of format 102:
When I try to run duplicity between two Ubuntu servers, a message is displayed:
"The authenticity of host ...... can't be established.
SSH-RSA key fingerprint is 102:...:...:...:...:......."
...
0
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1
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889
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Can not connect to a Google Cloud TPU using ssh (putty) in Windows
I have a google v3-8 TPU, i can't figure out how to connect to it using ssh in windows.
I did every guide there is, but the connection just times out.
What i tried (among others):
1.
Dos command line:
...
0
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2
answers
2k
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how to generate a small RSA key
I want to ssh-keygen -t rsa -b 512 but my linux is too "up to date" to allow this. Is there anyway to modify the settings to:
generate a 512bit key
let me authenticate to the server with ...
- 111
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0
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132
views
SSH connection strange behavior
I am using windows10 and I can connect to my server(Ubuntu 18.04) with PowerShell and Putty.
but not with the other two ssh client I have (MobaXtrem,Bitvise).
but when i turn on my VPN(SeedVpn) on ...
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3
votes
1
answer
4k
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Adding ssh keys to a new server without having previously set up users on that server
I've setup a clean new VPS running Ubuntu 20.04 LTS with Hetzner and would like to access it via ssh.
Here is what I've tried to do:
I have added my public ssh key (passphrase-less) in Hetzner's ...
- 155
2
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0
answers
393
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Remove BOTH ssh key for IP and ssh key for FQDN from known_hosts
Is it possible to remove an ssh key from known_hosts both for the IP and for the FQDN of a machine, knowing only one of the 2?
For example, I am on machine A, and I want to remove the public ssh key ...
1
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2
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4k
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Generating ssh-keys not creating key in PKCS1 format
I am attempting to create a public/private key pair using ssh-keygen. I need the key to be in PKCS1 format so that it states "BEING RSA PRIVATE KEY". No matter what I try it appears to only ...
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1
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Reconnect automatically to a disconnected ssh session [closed]
I am new to this community ,
I am working on my iot project in which my microcontroller is working as a server, taking data and executing request. My client is end device (mobile,tablet) and I am ...
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395
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How to uninstall ssh-keygen utility safely? [duplicate]
I am being tasked to remove ssh-keygen from Ubuntu servers and I don't want to break the computer. Can you please help, how to uninstall ssh-keygen utility safely?
Thanks
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7k
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Adding a ssh host key for a server name to `known_hosts` idempotently?
ssh-keygen -R $HOSTNAME can remove the ssh host key(s) from one's known_hosts. Can I add a specific host key (for a hostname/ip) to a known_hosts in an idempotent way?
I want to script ssh'ing into a ...
- 32.3k
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193
views
Why can't I authenticate my SSH connection?
I'm writing a bit confused because I've tried everything. Let me know if I'm missing any critical information for you to help me.
I'm trying to SSH into my Cyberpower PDU (device probably not ...
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7
votes
2
answers
3k
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Ubuntu 20.04 ssh-keygen unknown option -G unable to generate Diffie-Hellman parameters
I have noticed that the ssh-keygen for ubuntu 20.04 is missing the options for generating the Diffie-Hellman parameters. This is normally part of SSH hardening. Does anyone know why it has ...
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3
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1
answer
2k
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Using 2 key pairs simultaneously for ssh authentication
I have a ssh server running on a raspberry pi. This ssh server can only be accessed by 1 user on my ubuntu laptop only.
I have created 2 pairs of ssh keys using:
ssh-keygen -t ed25519 -o -a 100
ssh-...
- 151
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1
answer
4k
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Is it okay to use same SSH keypair for different servers, and how not to?
Initially i tried (and failed) to generate a new SSH keypair for a new server. By default it offers to save it into ~/.ssh/id_rsa, which obviously i couldn't, so as to not overwrite my existing key. ...
- 113
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2
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3k
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EC2: how to download the private key file for a user
I'm only working with terminal in order to create a user on a linux machine (ec2).
When creating a new user and then generating an ssh key for this user
ssh-keygen -f rsa I do this
I then get a rsa....
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1
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194
views
How to adequately add identical public-private ssh key to a new client machine?
I have generated private and public key pair files (id_rsa, id_rsa.pub) using ssh-keygen command in a machine A, which is a client. I have tested my connection to server in machine A and it is working ...
2
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0
answers
4k
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SSH authentication Permission denied (publickey,gssapi-keyex,gssapi-with-mic)
I'm having problem when I try to connect to a remote server using ssh with the following command:
ssh -vvv -l user hostname -p XXXX
I get the following result:
OpenSSH_7.9p1 Debian-10+deb10u1, ...
2
votes
2
answers
318
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how to create status of REMOTE HOST IDENTIFICATION HAS CHANGED when performing ssh to remote machine for testing
We want to cause the status from a remote Linux machine to return
"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r",
"@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @\r",
"@@@...
- 501
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7k
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What can someone do with your SSH Private Key? [closed]
What exactly can someone do with my Private Key after they used my laptop to create a SSH Public Key?
After reading a few websites, it looks like they can access a server pretending they are me when ...
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2
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1
answer
3k
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OpenSSH Windows Server 2016
I am trying to install OpenSSH on a windows server machine. When i use this command:
Get-WindowsCapability -Online | ? Name -like 'OpenSSH*
I don't get this output:
Name : OpenSSH.Client~~~~0.0.1....
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votes
3
answers
575
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Differing ssh host key in Container-Optimized OS instance
I created a Container-Optimized OS instance in the Google Cloud.
When I try to connect to it via ssh from outside the ssh host key fingerprint shown differs from the output of
ssh-keygen -lf /etc/ssh/...
2
votes
1
answer
98
views
How to setup ssh for a couple of servers?
I'm pretty confused about how ssh really works, and I have already asked a couple of questions related to this, but I suspect I'm going in the XY-problem trap.
So, what I want is this. I want to be ...
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1
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1k
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How to fetch ssh keys from servers?
I need to login to a host via ssh, get a keyfile, close the connection and then use the key to login without password on several machines.
The underlying problem is that I need to perform tests on a ...
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0
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219
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ssh key revocation list and -z version number
I've been reading about setting up an ssh certificate authority and controlling access via key revocation lists. And in the man page, it lists a -z option for specifying a version number for a key ...
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2
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8k
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How to verify the private key I have matches AWS keypair?
My AWS instance says it is configured to use the only keypair I have on my account and it has a fingerprint in the format of:
3c:64:a7:85:53:3f:81:1c:24:5a:d2:6a:5b:76:47:da:f3:14:63:88
I have a ...
- 213
4
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1
answer
1k
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Several ed25519 keys with the same prefix
I have created a bunch of ed25519 keys through ssh-keygen to connect to different machines I have access to. However, I noticed that all of them begin with the same, rather long prefix:
...
- 143
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1
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2k
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find ssh2 key fingerprint
How do I find the ssh fingerprint of a ssh2 key ? With a ssh-1 key I can do ssh-keygen -lf /path/to/keyfile. However when I convert the same key to a ssh2 key using ssh-keygen -e -f keyfile.pub > ...
- 101
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0
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101
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SSH copy key from Raspberry Pi to Linux
I am trying to create a new ssh key, and copy it to a server, using a previously generated ssh key.
/usr/bin/ssh-copy-id -f -i /home/pi/.ssh/newKey -o "IdentityFile=/home/pi/bob" [email protected]
The ...
- 133
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3
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544
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How to have single ssh public-private key pair for a user across different servers?
I am working on standardizing different bits in our environment and as part of that would like to move towards ssh key based authentication.
Currently we have individual accounts in each servers (...
- 73
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1
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2k
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Why is the same private key file generating two different public key strings?
I have an ssh key pair that was generated to use as an access key for my GoCD CI/CD server. It was working but due to some configuration changes I made (moved the server out of container to a Linux ...
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bash × 2
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