Questions tagged [key-authentication]

Questions pertaining to key authentication, a type of authentication that may be used as an alternative to password authentication. Instead of requiring a user's password, it is possible to confirm the client's identity by using asymmetric cryptography algorithms, with public and private keys.

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38 views

ssh error because pub key not present

I have a .ssh directory with a lot of keys to a lot of systems, using a collection of ssh config files, this has worked flawlessly for a few years now. I reinstalled my machine yesterday (from Ubuntu ...
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SSH login not working with Kerberos (Linux)

I am trying to perform SSH login using Kerberos authentication. Instead of Kerberos, password is prompted for login. There are three computers : client, kdcserver and service (SSHD server). Client is ...
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When using SSH is it possible to prevent password authentication only if a certificate exists in the user's home directory?

I am spinning up a public facing server with SSH running for remote access. Every standard human user will be using a certificate for authentication. However one very limited functional account exists ...
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22 views

Searching keys with gpg results in key server failure

The following simple command is failing $ gpg --search-keys "hi" gpg: error searching keyserver: Server indicated a failure gpg: keyserver search failed: Server indicated a failure ...
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Ubuntu 16.04.7 sshd won't accept 4096 bit public key authentication

[Ubuntu 16.04.7, OpenSSH_7.2p2 Ubuntu-4ubuntu2.10, OpenSSL 1.0.2g 1 Mar 2016, updated today as part of this activity] I'm trying to setup public key authentication for a new user I want to give ...
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50 views

SSH Publickey+TOTP and Password+TOTP simultaneously

I am trying to setup an SSH server where some users prefer to use an SSH key but others prefer LDAP provided passwords. I found out that I can set in sshd_config for publickey + PAM or PAM only ...
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Account creation newbie question

I have been told that I need to set up a special account on an older centos 6 linux server. Corporate Security needs to Nexpo Scan it and has asked for this specific user. Local Accounts If the ...
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83 views

I removed my public key from my ~/.ssh directory, why can I still access host without password?

I generated a public/private key pair on my client machine. They are in ~/.ssh as id_rsa and id_rsa.pub. I added the public key to the host machine's authorized_keys file, and now I can successfully ...
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how to append public keys to remote host instead of copy it

I used in my bash script the follwing cli , in order to send the public key to remote machine sshpass -p $pass scp /root/.ssh/authorized_keys root@$remote_host:~/.ssh/authorized_keys but since we ...
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1answer
35 views

No support authentication methods available (server sent: publickey)

I am trying to connect to my ubuntu instance after rebooting it up off of AWS. The public IPv4 address changed, and I updated the Host Name on PuTTY expecting it to connect like it always does after ...
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217 views

SSH client seems to be checking '/dev/null' instead of 'known_hosts' file when checking remote server's ECDSA key

I'd like to know why my known_hosts file doesn't seem to be checked correctly while using SSH. In short, my guess is that my SSH client is checking /dev/null instead of the known_hosts file. Details ...
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102 views

encrypt private keys for dropbear ssh-access

I'd like to use dropbear as an alternative, minimal ssh-server and -client. dropbear allows the use of private-public-keys for ssh-access, although the keys are not identical to the ones used by ...
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260 views

How to delete SSH keys

I am new to this field. I had a server administrator but he left. I assume his key was installed in authorized_keys. How to delete these keys if they exist. How can I find out if they are really (...
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DEBIAN SSH Server with google authenticator. How to allow “publickey+2FA” for user1 and “password+2FA” for user2?

0 The problem is very simple but I'm struggling for hours without finding the good solution. I want "user1" to log in to the SSH server with publickey + 2FA code (but no password prompt, ...
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200 views

Trouble verifying linux, even after downloading key I get “No public key”

Following these instructions, I downloaded and unpacked the kernel. https://priyachalakkal.wordpress.com/2013/01/19/verifying-digital-signature-using-gpg/ Then I tried to verify the signature but I ...
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20 views

How do I access gpg files, after moving to new system?

I don't know how to access my gpg files after moving them to a new os. The files contains my passwords so it is quite important. Previously I was using the app ' Pass ' to access them. I have the gpg ...
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251 views

Trouble accessing remote server with public key

i am posting this question after extensive search in google to create public key and accessing server using public key, i am still unable to resolve this issue, as i am getting below error. OpenSSH_7....
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45 views

ssh login public key authentication private or public key

What should be the value of the -i option when login in using ssh? I had previously supplied the public key ssh -i ~/.ssh/id_rsa.pub on an OpenBSD machine that worked but when trying to ssh into an ...
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116 views

SSH - Key signing of ED25519 style keys does not work

Trying to set up a SSH Cert Authority so I can centralize new key setup rather than modifying the authorized keys on each of my machines. I found something really odd - the keys that I develop work ...
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47 views

SSH PKI authentication

At my company, we are currently integrating AD authentication to our Linux servers. I've been able to complete this part using PBISO (Power Broker Identity Service). Users are able to login using AD ...
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Wiered ssh key connection

I couldnt use copy-id to copy ssh key to server (debian) so tried to copy public key manually into the /.ssh/authorized_keys so I generated a ssh key inside the macOs and put the public key inside the ...
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107 views

Can a user with no password set login with ssh?

First, I want to be clear, I am not asking about just using public key authentication without a prompt. I have a use case where a user must only be allowed access through SSH public key authentication....
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285 views

gnome-keyring: couldn't find any place to import files

I need to use a client certificate. I was able to import it successfully on Windows and Mac, however when I am trying to import it on Linux I am getting the following error: $ gnome-keyring import ...
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30 views

ssh server is rejecting public key [duplicate]

Sometimes I need to login on my Linux Mint 19 PC remotely via ssh. To make this more secure I try to switch to use Public Key authentication (as I already use it on my raspberries). Basically the ...
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980 views

ssh error while logging in using private key “loaded pubkey invalid format” and “error in libcrypto”?

UPDATED When I am trying to generate a public key it still gives me an error "error in libcrypto" Load key "breakthis": error in libcrypto Private key is given below I am trying to solve a Hack ...
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1answer
86 views

Client still can ssh login without password on server after generating new keys

First I generated keys on client (Ubuntu 18.04) $ ssh-keygen -t rsa -f .ssh/id_rsa then I copied it to server (Ubuntu Server 18.04) $ ssh-copy-id 192.168.1.58 Now I can see the key in .ssh/...
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41 views

What kind of host key does the `sshd` command require?

The man page for sshd states the -h argument Specifies a file from which to read a host key. But is it asking for the public host key or the private host key? I can't seem to find this tidbit of ...
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2k views

Specifying allowed client SSH key types that the server accepts

I have a server (running openssh 8.1p1-2) with sshd_config configured like this to accept only ed25519 keys: PubkeyAcceptedKeyTypes ssh-ed25519-cert-v01@openssh.com,ssh-ed25519 That works great for ...
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1answer
25 views

How do the server side commands configured in SSH authorized_keys process the incoming data?

Some utilities like git and Gitolite can restrict what commands an SSH key can run by making modifications to the authorized_key files. Gitolite for instance changes modifies the entry in the ...
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1k views

WSL ssh to localhost with publickey but keeping asking for password

I was trying to set up publickey ssh connection to localhost with no password login on my WSL(Ubuntu 16). But everytime I am keeping being asked to enter password. When I using port22, my password ...
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1answer
35 views

How can I set a policy to enable public key authentication only if the pubkey has a password that meets requirements?

How can I set a policy to enable public key authentication only if the pubkey has a password that meets requirements? Currently people make keys with ssh-keygen. We want to enforce creation and use ...
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1answer
1k views

Stuck not being able to setup the private/public key

So, this is what I'm trying to do, my windows 10 will connect to the remote Operating System, CentOS 7. I did ssh-keygen on the windows. Then using WinSCP, I copied the contents of id_rsa.pub on the ...
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61 views

Can an ssh key be configured to reject a connection if it is not connecting to the right port?

As sshd service can listen on different ports is it possible to configure a key which will work only if the connection was made on one port, but not the other? By this I mean that the key appears ...
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1answer
364 views

Not able to install latest R statistical package in Debian Stable

I am trying to install latest R package on Debian Stable (Buster) following instructions on this page: https://cloud.r-project.org/ I added following to /etc/apt/sources.list: deb https://cran....
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1answer
246 views

problem sftp connection with rsa keys

I am on RHEL 6. I have a user Jack which doesn't have shell access but SFTP. With my own user, I have created an RSA key pair with ssh-keygen command for jack (the user). I have created .ssh folder ...
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1answer
326 views

SSH connection with public key not working with specific name

When trying to connect to a server with: ssh -i MYKEY_SSH user@IP It prompts for the password. However, if I rename that key for any other name the connection is properly established. That is, if I ...
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1k views

How can I use public key authentication to access a ssh server on android?

My android 4.4.2 (it is old but can't be upgraded) phone runs a SSH server by SimpleSSHD app. It generates different random password at every login, so is very inconvenient for me as a client user. ...
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245 views

Add a remote server to known_hosts automatically without ssh-keyscan

I have a BusyBox environment without ssh-keyscan and I need to add a host to the known_host file, so that scp doesn't ask if I can trust the host. I read this question and it looks like it could be ...
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160 views

authorized_keys in non standard place

authorized_keys in usualy put under .ssh in one HOME's directory. I want to put it in a non standard place like /etc/AK/authorized_keys.archemar I set up sshd_config with a match rule Match user ...
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1answer
2k views

Authentication refused: bad ownership or modes for directory /root

I'm trying to SSH into my remote VPS with Debian onboard. Running sshd in debug mode, I found that: Authentication refused: bad ownership or modes for directory /root I tried setting permissions as ...
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3answers
745 views

ssh not allowing passwordless login

I use passwordless logins all the time and have set it up on numerous systems and have debugged a lot of issues with it. However, I'm in a situation that I can't diagnose the root cause. I have an ...
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Is it possible to have 2 ports open on SSH with 2 different authentication schemes?

I'm currently trying to set up an SSH server so that access to it from outside the network is ONLY allowed using an SSH Key and does not allow access to root or by any other username/password ...
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1answer
137 views

Trying to connect to remote server via SSH but still prompts for password

I generated a ssh key pair with ssh-keygen, use ssh-copy-id to the server and checked that the public key was added to authorized_keys, but then when i try to connect with ssh -i ~/.ssh/MY_KEY user@...
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1answer
374 views

Add an SSH key on boot

I have a Git repo that is authenticated with an SSH key - the key is not the standard id_rsa. I can run: eval $(ssh-agent -s) ssh-add /home/forge/.ssh/otherkey Then git pull origin master This ...
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2answers
88 views

SSH - Periodically require password even when public key is present

How do I allow public key authentication but still require user's password every 24 hours? Preferred host OS is Debian.
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1answer
67 views

Does ssh-add honor the declarations made in ssh_config file(s)?

Background I use a 4096-bit RSA key-pair for authorizing access to my server. By ssh_config files I am referring to ~/.ssh/config and /etc/ssh/ssh_config. Here's what my ~/.ssh/config looks like: ...
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2answers
128 views

Allow “another” user to make personal backups on my server through sshd with no shell access (public key login)

I have set up a Ubuntu server at my home just to learn "stuff". I overdid a bit and have some spare room on my SSD. I am prepared to give a friend some of that space to make backups on my computer. He ...
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1answer
519 views

How to mount Windows CIFS in Linux server using PKI authentication?

I have a Windows File Share server and want to mount those CIFS in Linux server using PKI authentication. This is the command to mount Windows shares in Linux using username & password: mount....
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1answer
3k views

How to Require PubkeyAuthentication using SSH from Linux client to Windows OpenSSH server

I know there are a million similar posts, but I have not yet found one that answers this question. I'm trying to establish an ssh connection from an Ubuntu 18.04 client to the built-in OpenSSH SSH ...
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2answers
525 views

Compare Key ID of RPM package with Key Fingerprint of RPM-GPG-KEY

During work with RPM packages I frequently need to validate signatures against available GPG keys. Using rpm -qip --nosignature <package.rpm> | grep Signature gives me an Key ID, i.e.: ...

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