As shown in the example, the proxy host's config/definition block should include the keyword ProxyJump. Using the below example as a guide, configure your ~/.ssh/config file to define the hosts you wish to ssh to/proxy through, as well as the usernames you would like to use to authenticate to each host. You will be requested to enter this PIN once per host. Ssh -J should be presented with a prompt for the YubiKey's PIV PIN resembling the following. Run a command in the following form, replacing user, proxy.host, etc. Step 4 - Login via ProxyJump Simple method: For Windows, this was already done as part of step 1. This will set the default PKCS11 provider to YKCS11. As with step 2, be sure to adjust the path to YKCS11 accordingly. Step 3 - Set YKCS11 as default PKCS11 providerĪdd a line like one of the following to the file ~/.ssh/config. The slot order should remain the same, thereby facilitating identification of the public key associated with your targeted private key. NOTE: These commands export all public keys stored in the YubiKey PIV app. Ssh-keygen -D /path/to/libykcs11.dylib -e Įxport the public key from the YubiKey using a command like one of the following (be sure to change the path accordingly), then add it to the authorized_keys file on the target systems. Source code for the Yubico PIV Tool can be downloaded from. Sudo apt update & sudo apt install ykcs11Īfter installing YKCS11, the library will be located at /usr/local/lib/libykcs11.Īt this time, the only way to obtain YKCS11 on CentOS/Rocky Linux is to compile the Yubico PIV Tool from source. Install YKCS11 from Ubuntu's preconfigured repositories by running: Once installed, the YKCS11 library will be located at /usr/local/lib/libykcs11.dylib. YKCS11 can be installed via our Yubico PIV tool application. Note, if you installed the 32-bit PIV Tool on 64-bit Windows, your path will differ slightly (it will begin with C:\Program Files (x86) instead of C:\Program Files). If everything is in order, this command's output should be PKCS11Provider "C:\Program Files\Yubico\Yubico PIV Tool\bin\libykcs11.dll". You can verify that this command succeeded by running: This configures Windows' SSH client to use YKCS11 to access the YubiKey. New-Item -Path $env:USERPROFILE\.ssh\ -Name "config" -ItemType "file" -Value 'PKCS11Provider "C:\Program Files\Yubico\Yubico PIV Tool\bin\libykcs11.dll"' Once you've verified you meet the minimum requirements and have installed YKCS11, open PowerShell and run the following. If an earlier version is reported, you'll need to update your OpenSSH installation. Your output should resemble OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2. Next, verify that your OpenSSH installation is at least 8.1p1 by running ssh -V in PowerShell. For 32-bit Windows, download the one ending in -win32.msi instead. For example, if you're running 64-bit Windows, you should download the file ending with -win64.msi (under the latest version heading). To obtain a copy of YKCS11, head over to, download the latest release for your system architecture, and install it. To use Windows' native SSH client with the PIV smart card function of the YubiKey, you will need to download and install Yubico's YKCS11 library, which comes bundled with the Yubico PIV Tool. This guide assumes a YubiKey that has its PIV application pre-provisioned with one or more private keys and corresponding certificates, etc. The steps below cover setting up and using ProxyJump with YubiKeys. ProxyJump allows a user to confidentially tunnel an SSH session through a central host with end-to-end encryption.
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