Why are 3 entries added to ~/.ssh/known_hosts even though I use only a single key type? I set up a new server (hostname: odroid) and copied my public ed25519 key to it. I signed to it for the first time and noticed 3 new entires have been added to ~/.ssh/known_hosts on my local machine: odroid …
How to authenticate through OpenSSH then sudo with only one Ticket Service (Kerberos TGS host/fqdn) By now, we are using OpenSSH GSSAPI authentication on all of our servers (Debian from 10 to 12). Then we sudo -i, using ldap authentication (through sssd-ldap). I would like to get rid of the ldap authentication and rely on …
what is the use of setting up OpenSSH on Ubuntu Live Server 22.04? Setup Info I am using Hyper-V to spawn Ubuntu live 22.04 VMs. During the installation procedure it asks if I want to Install OpenSSH server, whether I select this option only results in one change. The change: Cloud init creates a conf …
Log in to remote server by using a generated public key I have a zsh script with which I logged into a remote host to copy some folders. The system asks me each time to give the password of the local host which I want to bypass, otherwise I have to enter the passphrase many …
can not setup passwordless ssh using key by MANUALLY COPY public key to server context: firstly, i got a new ubuntu 20.04 server with a password I’m using OpenSSH client on Windows 10 I want to do passwordless login, then I ssh to server using passwords, manually create ~/.ssh /authorized_keys and open it in vim …
Are all Debian 11 systems automatically vulnerable to CVE-2023-38408? I really really hope I’m wrong here, but it seems that Debian 11 has a vulnerable version of OpenSSH. My OpenSSH banner reports my OpenSSH version is: 8.4p1 Debian 5+deb11u1 I checked with sshd and it reports the same version. According to this CVE-2023-38408 ANY version …
how to properly mask ssh server background service I want to mask ssh so the ssh server is disabled till I need it myself. but still want to have ssh client capabilities. I use openssh and the service is ssh.service and its alias sshd.service I use ubuntu 22.04 is the correct steps: systemctl stop sshd …
Does ssh client interfere with named pipes? Setup: I have a system in bash where I have a single file that spawns off a pipeline of background processes. In stage one of the pipeline, there are multiple processes writing to a single named pipe. In the next stage of the pipeline there is a reader …
How to make a script to forward commands to an SSH server? I have a remote SSH server with several custom utilities for my work. However, there are times when I feel lazy and don’t want to start a full SSH session just to execute a single command. This motivated me to create a multi-call …
How to access my computer's terminal in the university dorm from another computer? I have used ssh to access remote computers/servers where they provided me a username, a password, and an IP address (like xxx:xxx:xx.xx). What I need to do is: ssh username@xxx.xxx.xx.xx and then it will ask for the password. After entering the password, …
Future Security Update to openssh-server on Ubuntu Server 20.04 LTS? As per: https://launchpad.net/ubuntu/focal/+source/openssh/+changelog and https://ubuntu.com/blog/what-is-an-ubuntu-lts-release and https://ubuntu.com/about/release-cycle " For each Ubuntu LTS release, Canonical maintains the Base Packages and provides security updates, including kernel livepatching, for a period of ten years. " Ubuntu 20.04 LTS was released on April 23, 2020. Will Ubuntu 20.04 LTS …
How to restart sshd after assembly? it is necessary to update the openssh server to the latest version, since everything is closed, it has come to manually assemble it ./configure –prefix=/usr –with-pam –with-selinux –with-privsep-path=/var/lib/sshd/ –with-kerberos5=/etc/krb5.conf –sysconfdir=/etc/ssh –with-default-path=/usr/bin –with-pid-dir=/run && make the version was updated, the installation was successful, but I can’t restart it I get …
Why does ssh port forwarding fail? In this example: $ ssh -L 8001:192.168.122.4:80 the output give is the default help: usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port] [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file] [-J [user@]host[:port]] [-L address] [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port] …
Meaning of "key options: agent-forwarding" in OpenSSH logging At first, I’d like to note that I am aware that there are a lot of other questions regarding SSH agent forwarding. The people there wanted to know how to make agent forwarding work or how to configure it securely. But I have the opposite problem: It …
Missing libraries after installing openssl (libcrypto.so.1.1, …) I made my Arcolinux (5.12.14-arch1-1 x86_64) unusable by trying to install openssh. Googled a few hours and tried something, but without success. I did the following: $sudo pacman -S openvpn Then vpn sayed that it requires oppenssl, so I installed it $sudo pacman -S openssl Then I tried …
SSH into server running xinetd throws error "kex_exchange_identification: read: Connection reset by peer" I have two servers running ubuntu 22.04.2 LTS with openssh-server 1:8.9p1-3ubuntu0.1 installed. And on both servers I have installed the same admin user. I want to test the legacy superdaemon xinetd for ssh. So I stopped the ssh.service on the first server …
How to generate ssh key with AES-GCM? I used that form to create my ssh key : ssh-keygen -t ed25519 -C "your_email@example.com" and I got: Encryption: aes256-cbc, is it possible to use aes256-gcm@openssh.com instead? thanks Asked By: James78 || Source man 1 ssh-keygen states : -Z cipher Specifies the cipher to use for encryption when …
ansible copy ssh keys to multiple users' home directory I have ssh keypair on my ansible_host, which I want to copy to multiple user’s authorized keys on target host. I’m trying with-item construct, but it complaints about .pub key not an invalid key here’s what I’m trying. – authorized_key: user: "{{ item.user }}" key: "{{ …
How to read and debug SSH verbose-mode? Let’s say I use this command: ssh -vvv user@server I get an output similar to this: send packet: type 21 ssh_set_newkeys: mode 1 receive packet: type 6 SSH2_MSG_SERVICE_ACCEPT received receive packet: type 51 Permission denied (publickey,password) What are all these packet-types? Where can I read and learn about …
How to disable weak HMAC Algorithms? Not found in ssh_config or sshd_config file A vulnerability scan showed that in a Debian 10 system, insecure MAC algorithms are in use: umac-64-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,hmac-sha1 When I do ssh -Q mac, I get the following results: hmac-sha1 hmac-sha1-96 hmac-sha2-256 hmac-sha2-512 hmac-md5 hmac-md5-96 umac-64@openssh.com umac-128@openssh.com hmac-sha1-etm@openssh.com hmac-sha1-96-etm@openssh.com hmac-sha2-256-etm@openssh.com hmac-sha2-512-etm@openssh.com hmac-md5-etm@openssh.com hmac-md5-96-etm@openssh.com …
