The package cannot be. It’s quite easy, just run: # WSL2. bash. Securing SSH with the YubiKey. d/sudo contains auth sufficient pam_u2f. $ sudo apt update && sudo apt install -y gnupg2 gnupg-agent scdaemon pcscd $ gpg --card-status The last command should go without any errors (if you have public keys for that YubiKey). Visit yubico. Solutions. Ensure that you are running Google Chrome version 38 or later. sudo apt-get. config/Yubico $ pamu2fcfg -u $(whoami) >> ~/. MacBook users can easily enable and use the YubiKey’s PIV-compatible smart card functionality. Run: pamu2fcfg >> ~/. wsl --install. If still having issues consider setting following up:From: . Support Services. Unfortunately documentation I have found online is for previous versions and does not really work. A one-command setup, one environment variable, and it just runs in the background. YubiKey Personalization Tool. But if i unlock the device after boot in a terminal it works fine (I have to enter the PIN and then touch the Yubikey): $ sudo systemctl start systemd-cryptsetup@luksx2df9310a75x2d5eadx2d43d8x2d8d55x2d0b33ba5e2935. 11. Woke up to a nonresponding Jetson Nano. bash. If you fail to touch your YubiKey (or if it’s unplugged), you can still use your user account password for sudo authentication — and if you do touch your YubiKey, you won’t have to enter your password. Works with YubiKey; Secure remote workers with YubiEnterprise Delivery. Insert your YubiKey to an available USB port on your Mac. GnuPG Smart Card stack looks something like this. Sorted by: 5. Enable the sssd profile with sudo authselect select sssd. GnuPG environment setup for Ubuntu/Debian and Gnome desktop. Any feedback is. I have the same "Failed to connect" issue on macOS Catalina, ykman 3. If it is there, it may show up as YubiKey [OTP+FIDO+CCID] <access denied> and ykman will fail to access it. I want to use my Yubikey (Legacy) as OTP device for KeepassXC. /etc/pam. con, in particular I modified the following options. The Yubico PAM module provides an easy way to integrate the YubiKey into your existing user authentication infrastructure. Once setup via their instructions, a google search for “yubikey sudo” will get you to the final steps. 2 # Form factor: Keychain (USB-A) # Enabled USB interfaces: OTP+FIDO+CCID # NFC interface is enabled. ssh/id. Insert your personal YubiKey into a USB port on your terminal - the LED in the centre of the YubiKey button should. Run: sudo nano /etc/pam. /etc/pam. Log back into Windows, open a WSL console and enter ssh-add -l - you should see nothing. 1~ppa1~focal1 amd64 Command line tool for configuring a YubiKey yubikey-personalization/focal 1. I'm using Linux Mint 20. d/system-auth and added the line as described in the. sudo add-apt-repository ppa:yubico/stable sudo apt-get update sudo apt-get install yubikey-personalization yubikey-personalization-gui. Programming the YubiKey in "Static Password" mode. 24-1build1 amd64 Graphical personalization tool for YubiKey tokens. If you have several Yubikey tokens for one user, add YubiKey token ID of the other devices separated with :, e. When your device begins flashing, touch the metal contact to confirm the association. sudo apt install yubikey-manager Plug your yubikey inside the USB port. Make sure that gnupg, pcscd and scdaemon are installed. Opening a new terminal, if you now try and SSH to your system, you should be prompted for a Yubikey press: ben@optimus:~$ ssh ben@138. Provides a public key that works with all services and servers. sudo; pam; yubikey; dieuwerh. You can do SSH pubkey authentication with this, without the key ever being available to the host OS. Once booted, run an admin terminal, or load a terminal and run sudo -i. YubiKey C Client Library (libykclient) is a C library used to validate an Yubikey OTP against Yubico’s servers. Website. You can do SSH pubkey authentication with this, without the key ever being available to the host OS. ( Wikipedia)Enable the YubiKey for sudo. Choose one of the slots to configure. It's not the ssh agent forwarding. Click the "Scan Code" button. Prepare the Yubikey for regular user account. pamu2fcfg > ~/. Run: sudo nano /etc/pam. Select Add Account. Starting with Chrome version 39, you will be able to use the YubiKey NEO or YubiKey NEO-n in U2F+HID mode. so Test sudo. Using the YubiKey locally it's working perfectly, however sometimes I access my machine via SSH. Open the Yubico Get API Key portal. Run: mkdir -p ~/. Insert your first Yubikey into a USB slot and run commands as below. " appears. U2F has been successfully deployed by large scale services, including Facebook, Gmail, Dropbox,. The tokens are not exchanged between the server and remote Yubikey. So now we need to repeat this process with the following files:It also has the instruction to setup auto-decrypt with a Yubikey on boot. A yubikey would work on longhold a password set to it but that would require multiple keys for multiple admin accountsusers (multiple rpis in my case). Yubikey remote sudo authentication. If you have a Yubikey, the initial configuration process is as follows: Install the ykman program and any necessary utilities. sudo editor /etc/ssh/authorized_yubikeys Fill it with the username followed by a colon and the first 12 characters of the OTP of the yubikey. Secure-ish but annoying: grant passwordless sudo access to an explicit list of users:Setting up OpenSSH for FIDO2 Authentication. An existing installation of an Ubuntu 18. addcardkey to generate a new key on the Yubikey Neo. dmg file) and drag OpenSCTokenApp to your Applications. Yubikey challenge-response mode for SUDO; FIDO U2F authentication; Yubikey for SSH authentication; Prerequisites. To generate a key, simply put in your email address, and focus your cursor in the “YubiKey OTP” field and tap your Yubikey. Warning! This is only for developers and if you don’t understand. Programming the NDEF feature of the YubiKey NEO. Primarily, I use TouchID for sudo authentication on OSX, but I also tend to be connected to a CalDigit TS3 Plus dock and external monitors with my laptop lid closed. It however wont work for initial login. 2 p4 and still have the same issue; after running sudo -i the sudo command hangs indefinitely, with one minor difference. Run this. Reboot you’re machine and it will prompt you for your YubiKey and allow you to unlock your LUKS encrypted root patition with it. e. Defaults to false, Challenge Response Authentication Methods not enabled. config/Yubico. Create a yubikey group if one does not exist already: sudo groupadd yubikey Add the users that you would like to authenticate to this group like this: sudo usermod -aG yubikey username Each user must have a ~/. For anyone else stumbling into this (setting up YubiKey with Fedora). And the procedure of logging into accounts is faster and more convenient. This applies to: Pre-built packages from platform package managers. A Yubikey is a small hardware device that you install in USB port on your system. This guide covers how to secure a local Linux login using the U2F feature on YubiKeys and Security Keys. “The YubiKey is a hardware authentication device manufactured by Yubico to protect access to computers, networks, and online services that supports one-time passwords (OTP), public-key cryptography, and authentication, and the Universal 2nd Factor (U2F) and FIDO2 protocols [1] developed by the FIDO Alliance. Install Packages. Now, I can use command sudo, unlock the screen, and log in (only after logging out) with just my Yubikey. 1 Answer. Run this. 14. d/sudo. After upgrading from Ubuntu 20. Configure USB. Install U2F tools from the Yubico PPA First, enable the Yubico PPA and install the U2F PAM module: sudo add-apt-repository ppa:yubico/stable && sudo apt-get update sudo apt-get install libpam-u2f 2. Install GnuPG + YubiKey Tools sudo apt update sudo apt -y upgrade sudo apt -y install wget gnupg2 gnupg-agent dirmngr cryptsetup scdaemon pcscd secure-delete hopenpgp-tools yubikey-personalization Check GPG installation with your YubiKey. Open KeePass2Droid, select “Password+Challenge-Response”, enter your master password and hit “Load OTP Auxiliary file…” which should open YubiChallenge. For sudo you can increase the password time so you don't need it every 30 seconds and you can adjust your lock screen similarly while still allowing the screen to sleep. The tokens are not exchanged between the server and remote Yubikey. because if you only have one YubiKey and it gets lost, you are basically screwed. sudo apt-add-repository ppa:yubico/stable sudo apt update sudo apt install scdaemon yubikey-manager libpam-yubico libpam-u2f libu2f-udev; Change the pin to the Fido applicationYubikey 4 OTP+U2F+CCID (1050:0407) not working after attachment to WSL #139. sudo apt -y install python3-pip python3-pyscard pip3 install PyOpenSSL pip3 install yubikey-manager sudo service pcscd start. I've tried using pam_yubico instead and. Insert YubiKey into the client device using USB/Type-C/NFC port. You can upload this key to any server you wish to SSH into. Since you are using a higher security (2FA) mechanism to unlock the drive, there is no need for this challenge. 0. This post introduces the FIDO protocol(s) and shows how to install and enable a FIDO U2F security key as an alternative authentication factor for logging into a terminal, GDM, or authenticating for sudo. 1. If the user has multiple keys, just keep adding them separated by colons. Run the personalization tool. This should fill the field with a string of letters. After you do this then only someone with both the password and the Yubikey will be able to use the SSH key pair. Underneath the line: @include common-auth. a device that is able to generate a origin specific public/private key pair and returns a key handle and a public key to the caller. It’ll get you public keys from keys. Don’t leave your computer unattended and. In the post Yubikey is not recognized right after boot , a method to force the detection of the YubiKey was to enter the command: sudo udevadm trigger. Would it be a bad idea to only rely on the Yubikey for sudo? Thanks. To install the necessary packages, run:Programming the YubiKey in "OATH-HOTP" mode. g. pcscd. d/system-auth and add the following line after the pam_unix. org (we uploaded them there in the previous part) In case you haven’t uploaded the public keys to keys. and done! to test it out, lock your screen (meta key + L) and. config/Yubico # do not commit this directory to a dotfiles repo or anything like that pamu2fcfg > ~/. find the line that contains: auth include system-auth. ~~ WARNING ~~ Never execute sudo apt upgrade. FIDO2 PIN must be set on the. 4 to KeepassXC 2. : pam_user:cccccchvjdse. 这里需要用到 GPG 的配置，具体就参考之前的部落格吧，因为使用的是 GPG 的 ssh key 来进行认证。 这里假设已经配置好了，我们首先拿一下它的. So ssh-add ~/. Using the YubiKey locally it's working perfectly, however sometimes I access my machine via SSH. sudo apt install -y yubikey-manager yubikey-personalization # some common packages # Insert the yubikey ykman info # your key should be recognized # Device type: YubiKey 5 NFC # Serial number: # Firmware version: # Form factor: # Enabled USB interfaces: OTP+FIDO+CCID # NFC interface is enabled. 2 votes. For this open the file with vi /etc/pam. It is very straight forward. If you’re wondering what pam_tid. PAM is used by GNU/Linux, Solaris and Mac OS X for user authentication, and by other specialized applications such as NCSA MyProxy. Add the yubikey. Therefore I decided to write down a complete guide to the setup (up to date in 2021). Make sure Yubico config directory exist: mkdir ~/. Registered: 2009-05-09. so line. This applet is a simpler alternative to GPG for managing asymmetric keys on a YubiKey. This is the official PPA, open a terminal and run. Contact support. Code: Select all. Once YubiKey Manager has been downloaded, you can configure a static password using the following steps: Open YubiKey Manager. I bought a YubiKey 5 NFC. 04 a yubikey (hardware key with challenge response) not listed in the combobox. org (as shown in the part 1 of this tutorial). pls find the enclosed screenshot. If you don’t have your YubiKey, it will give the following prompt: Security token not present for unlocking volume root (nvme0n1p3_crypt), please plug it in. If your udev version is lower than 244, to set up your Linux system: Verify that libu2f-udev is installed on your system. When Yubikey flashes, touch the button. and I am. Verify the inserted YubiKey details in Yubico Authenticator App. Select the Yubikey picture on the top right. I have a 16” MacBook Pro now and have followed the same process for U2F for sudo and su on my system. Step 2: Generating PGP Keys. So I edited my /etc/pam. Place. After updating yum database, We can. nz. Use this to check the firmware version of your Yubikey: lsusb -v 2>/dev/null | grep -A2 Yubico | grep "bcdDevice" | awk '{print $2}' The libsk-libfido2. so line. 04/20. ProxyJump allows a user to confidentially tunnel an SSH session through a central host with end-to-end encryption. Under Long Touch (Slot 2), click Configure. Install U2F tools from the Yubico PPA First, enable the Yubico PPA and install the U2F PAM module: sudo add-apt-repository ppa:yubico/stable && sudo apt. ( Wikipedia) Enable the YubiKey for sudo. . 0 answers. If you haven’t already, Enable the Yubico PPA and f ollow the steps in Using Your U2F YubiKey with Linux. Now that you verified the downloaded file, it is time to install it. Then the message "Please touch the device. Open settings tab and ensure that serial number visibility over USB descriptor is enabled. Unlock your master key. $ sudo apt-get install python3-yubico. Instead of having to remember and enter passphrases to unlock. 2p1 or higher for non-discoverable keys. Yubico also provides packages for Ubuntu in the yubico/stable PPA: sudo apt-add. It seems like the Linux kernel takes exclusive ownership over the YubiKey, making it difficult for our programs to talk with it. YubiKey. YubiKey 4 Series. $ sudo apt install yubikey-luks $ sudo yubikey-luks-enroll -d /dev/nvme0n1p3 -s 1 You will be prompted for a challenge passphrase to use to unlock your drive as the first factor, with the YubiKey being the second factor. To enforce 2FA using U2F with your Yubikey for su, do the following: sudo vi /etc/pam. 5. In Gnome Tweaks I make the following changes: Disable “Suspend when laptop lid is closed” in General. You will be presented with a form to fill in the information into the application. With a basic pubkey setup, compromise of the host is by far the biggest risk, even if the key. This section covers how to require the YubiKey when using the sudo command, which should be done as a test so that you do not lock yourself out of your. sudo ln -s /var/lib/snapd/snap /snap. Require Yubikey to be pressed when using sudo, su. Enable the udev rules to access the Yubikey as a user. We are going to go through a couple of use cases: Setup OpenGPG with Yubikey. 2. so middleware library must be present on the host. config/Yubico; Run: pamu2fcfg > ~/. To enable use without sudo (e. Using Non-Yubikey Tokens. because if you only have one YubiKey and it gets lost, you are basically screwed. Enable pcscd (the system smart card daemon) bash. config/Yubico/u2f_keys. Answered by dorssel on Nov 30, 2021. For example mine went here: /home/user/lockscreen. Post navigation. 5-linux. For the other interface (smartcard, etc. d/sudo’: Permission denied and attemps to escalate to sudo result in sudo: PAM authentication error: Module is unknown. Open a second Terminal, and in it, run the following commands. While initially developed by Google and Yubico, with contribution from NXP Semiconductors, the standard is now hosted. Creating the key on the Yubikey Neo. Additionally, you may need to set permissions for your user to access YubiKeys via the. Enable the YubiKey for sudo Open the sudo config file for PAM in an editor: sudo nano /etc/pam. Sudo through SSH should use PAM files. Open the OTP application within YubiKey Manager, under the " Applications " tab. :~# nano /etc/sudoers. Now if everything went right when you remove your Yubikey. Create a base folder for the Yubikey mk -pv ~/. 2. Configure your key (s) A YubiKey is a small USB and NFC based device, a so called hardware security token, with modules for many security related use-cases. 3 or higher for discoverable keys. Following the reboot, open Terminal, and run the following commands. Delivering strong authentication and passwordless at scale. Swipe your YubiKey to unlock the database. Disconnected it and then mounted sdcard in different device and found /var/log/syslog consumed disk space with vino-server messages. This is the official PPA, open a terminal and run. Yubikey not recognized unless using sudo. such as sudo, su, and passwd. The YubiKey U2F is only a U2F device, i. d/common-u2f, thinking it would revert the changes I had made. d/sudo no user can sudo at all. d/sshd. d/sudo: sudo nano /etc/pam. Yubico Authenticator shows "No account. Try to use the sudo command with and without the Yubikey connected. But you can also configure all the other Yubikey features like FIDO and OTP. Edit the. You can also follow the steps written below for how the setup process usually looks when you want to directly add your YubiKey to a service. Just type fetch. rules file. Run: sudo apt-get install libpam-u2f; 3 Associating the U2F Key(s) With Your Account. $ sudo dracut -f Last remarks. This post introduces the FIDO protocol(s) and shows how to install and enable a FIDO U2F security key as an alternative authentication factor for logging into a terminal, GDM, or authenticating for sudo. e. . with 3 Yubikey tokens: Let's install the yubikey-manager (and dependency pcscd) and make sure you can connect to the YubiKey: $ sudo apt update $ sudo apt install -y yubikey-manager $ ykman info Device type: YubiKey 5 NFC Serial number: 13910388 Firmware version: 5. Code: Select all. Users have the flexibility to configure strong single-factor in lieu of a password or hardware-backed two-factor authentication (2FA). Using sudo to assign administrator privileges. Set the touch policy; the correct command depends on your Yubikey Manager version. To write the new key to the encrypted device, use the existing encryption password. 152. Generate an API key from Yubico. Additionally, you may need to set permissions for your user to access YubiKeys via the. Configure USB interface? [y/N]: y I had a Yubikey 4 and for this version, the above command did not work: Error: Configuring applications is not supported on this. YubiKey Manager can be installed independently of platform by using pip (or equivalent): pip install --user yubikey-manager. GnuPG environment setup for Ubuntu/Debian and Gnome desktop. Modify /etc/pam. This means that web services can now easily offer their users strong authentication with a choice of authenticators such as security keys or. For these users, the sudo command is run in the user’s shell instead of in a root shell. The correct equivalent is /etc/pam. To install Yubico Authenticator, simply use the following command: sudo snap install yubioath-desktop. ignore if the folder already exists. With this policy configuration the Pritunl Zero server will only provide an SSH certificate for the public key of the users YubiKey. Follow the instructions below to. 1. Or load it into your SSH agent for a whole session: $ ssh-add ~/. 10+, Debian bullseye+): Run ykman openpgp set-touch aut cached. When your device begins flashing, touch the metal contact to confirm the association. The PAM module can utilize the HMAC-SHA1 Challenge-Response mode found in YubiKeys starting with version 2. Each. pam_user:cccccchvjdse. . d/sudo had lines beginning with "auth". Unfortunately, for Reasons™ I’m still using. d/screensaver; When prompted, type your password and press Enter. The YubiKey is a small hardware authentication device, created by Yubico, that supports a wide range of authentication protocols. Thousands of companies and millions of end-users use YubiKey to simplify and secure logins to computers, internet services, and mobile apps. sudo apt update && sudo apt upgrade -y sudo apt install libpam-u2f -y mkdir -p ~/. yubioath-desktop`. I'm wondering if I can use my Yubikey 4 to authenticate when using sudo on Linux instead of typing my password. Workaround 1. ssh/id_ed25519_sk [email protected] 5 Initial Setup. " Now the moment of truth: the actual inserting of the key. service sudo systemctl start u2fval. sudo security add-trusted-cert -d -r trustRoot -k /Library. Fix expected in selinux-policy-3. pamu2fcfg > ~/. sudo apt-get install yubikey-personalization sudo apt-get install libpam-yubico Configure yubikey and passphrase. For open source communities, CentOS offers a solid, predictable base to build upon, along with extensive resources to build, test, release, and maintain their code. Do note that you don't have to run the config tool distributed with the package, nor do you need to update pam as in Ubuntu. The default deployment config can be tuned with the following variables. YubiKey is a Hardware Authentication. sudo add-apt-repository ppa:yubico/stable && sudo apt-get update Just download and run the official AppImage. This section covers how to require the YubiKey when using the sudo command, which should be used as a test so that you do not lock yourself out of your computer. sudo make install installs the project. Hi, First of all I am very fascinated of the project it awesome and gives the WSL one of the most missing capabilities. USB drive or SD card for key backup. I get the blinking light on the Yubikey, and after pressing it, the screen goes black as if it is going to bring up my desktop, but instead it goes back to the log in. One thing that I'm very disappointed with in the YubiKey 5 is that while the YubiKey has the potential to protect FIDO/FIDO2 access with a PIN, and it even has the ability to securely wipe the credentials after a certain number of invalid PIN attempts to prevent guessing/brute forcing that PIN, there is no way for the user to configure it so that the PIN is actually. For building on linux pkg-config is used to find these dependencies. $ sudo apt update ; sudo apt -y upgrade $ sudo apt -y install wget gnupg2 gnupg-agent dirmngr cryptsetup scdaemon pcscd secure-delete hopenpgp-tools yubikey-personalization Note Live Ubuntu images may require modification to /etc/apt/sources. and so interchangeable, is that correct? It all appears to be pretty far from being plug and play, often seeming to require a lot of additional software/modules to get specific things working. It is complete. g. This guide assumes a YubiKey that has its PIV application pre-provisioned with one or more private keys and corresponding certificates,. SoloKeys are based on open-source hardware and firmware while YubiKey's are closed source. Select slot 2. Thanks! 3. This document explains how to configure a Yubikey for SSH authentication Prerequisites Install Yubikey Personalization Tool and Smart Card Daemon kali@kali:~$ sudo apt install -y yubikey-personalization scdaemon Detect Yubikey First, you’ll need to ensure that your system is fully up-to-date: kali@kali:~$ pcsc_scan Scanning present readers. $ sudo apt install yubikey-manager $ ykman config usb --disable otp Disable OTP. 1. Securely log in to your local Linux machine using Yubico OTP (One Time Password), PIV-compatible Smart Card, or Universal 2nd Factor (U2F) with the multi-protocol YubiKey. Lastly, I also like Pop Shell, see below how to install it. Never needs restarting. so cue; To save and exit :wq! Note that cue on the end of the added line displays a prompt in the terminal when it's time to press the button on your Yubikey. Easy to use. Universal 2nd Factor (U2F) is an open standard that strengthens and simplifies two-factor authentication (2FA) using specialized USB or NFC devices based on similar security technology found in smart cards. YubiKeys implement the PIV specification for managing smart card certificates. The Yubikey is with the client. The steps below cover setting up and using ProxyJump with YubiKeys. By default this certificate will be valid for 8 hours. save. AppImage / usr / local / bin / ## OR ## mkdir -p ~ / bin / && cp -v yubikey-manager-qt-1. Create the file for authorized yubikey users. I am. It works just fine on LinuxMint, following the challenge-response guide from their website. rht systemd [1]: Started PC/SC Smart Card Daemon. Local Authentication Using Challenge Response. Basically, you need to do the following: git clone / download the project and cd to its folder. Open settings tab and ensure that serial number visibility over USB descriptor is enabled. YubiKeys implement the PIV specification for managing smart card certificates. This way the keyfile is stored in the hardware security token, and is never exposed to the internet. I've recently obtained a YubiKey 5 NFC, which seems to be working fine when prompted for a u2f token (both on Firefox and Chromium) but in order to use it in OTP mode, I need to run the applications with sudo. age-plugin-yubikey only officially supports the following YubiKey variants, set up either via the text interface or the --generate flag: YubiKey 4 series. If you're looking for setup instructions for your. I've recently setup sudo to require the press of my YubiKey as 2FA via pam_u2f. We need to install it manually. The YubiKey enables authentication for customers, protects access to the client dashboard, and secures SSH and sudo access on production servers. The Yubikey is with the client. Yubikey is not just a 2FA tool, it's a convenience tool. The steps below cover setting up and using ProxyJump with YubiKeys. Readme License. However, if you have issues perhaps look into enabling CCID or disabling OTP and deleting it from the configured slots using the yubikey-personalization. When building on Windows and mac you will need a binary build of yubikey-personalization , the contents should then be places in libs/win32, libs/win64 and libs/macx respectively. Basically gpg-agent emulates ssh-agent but lets you use normal SSH keys and GPG keys. -. This mode is useful if you don’t have a stable network connection to the YubiCloud. sudo wg-quick up wg0 And the wg1 interface like this: sudo wg-quick up wg1 If your gpg-agent doesn't have the PGP key for your password store in its cache, when you start one of those interfaces, you'll be prompted for the PGP key's passphrase -- or if you've moved the PGP key to a YubiKey, you'll be prompted to touch your YubiKey. Per user accounting. 2. 1 Answer. so no_passcode. Plug-in yubikey and type: mkdir ~/. Tagged : common-auth u2f / kubuntu / Yubikey 2fa / yubikey kubuntu. Vault Authentication with YubiKey. Start WSL instance. The YubiKey 5Ci with Lightning connector and USB-C connector is priced at $75. Add: auth required pam_u2f. Install GUI personalization utility for Yubikey OTP tokens. Thanks! 3. Create the file /etc/ssh/authorized_yubikeys: sudo touch /etc/ssh/authorized_yubikeys. 10+, Debian bullseye+): Run ykman openpgp set-touch aut cached. 7 Form factor: Keychain (USB-A) Enabled USB interfaces: OTP+FIDO+CCID NFC interface is enabled. I couldn’t get U2F for login and lock screen working and opted to use the Yubikey as an optional PIV card for login (of course using a long, unique, randomized password for my user accounts). I've tried using pam_yubico instead and sadly it didn't. Sudo with yubikey enabled hangs indefinitely and the processes dont respond to kills. Plug in YubiKey, enter the same command to display the ssh key.