Yubikey GPG inside WSL2.md

Yubikey GPG inside WSL2

1. Install GPG4Win.

2. Start up Kleopatra (a UI tool from 1) and make sure your YubiKey is loaded there.

   • You can also add GPG4Win to Startup folder using a link with this Target:

     "C:\Program Files (x86)\GnuPG\bin\gpg-connect-agent.exe" /bye
     

     This will only load the agent at Startup, and you won't be bothered by any UI or tray agent.

3. Download wsl2-ssh-pageant into your Windows %userprofile%/.ssh directory (Windows dir is important for performance).

4. Install socat and gpg inside WSL as you would in a "normal" distro, e.g.

   apt-get install -y gnupg2 gnupg-agent socat
   

5. Create a ~/.bash_profile or ~/.zprofile (for ZSH) inside WSL:

   ### https://github.com/BlackReloaded/wsl2-ssh-pageant#bashzsh
   WIN_USER="<your_windows_username_here>"
   SSH_DIR="${HOME}/.ssh" #
   mkdir -p "${SSH_DIR}"
   wsl2_ssh_pageant_bin="${SSH_DIR}/wsl2-ssh-pageant.exe"
   ln -sf "/mnt/c/Users/${WIN_USER}/.ssh/wsl2-ssh-pageant.exe" "${wsl2_ssh_pageant_bin}"
   
   listen_socket() {
     sock_path="$1" && shift
     fork_args="${sock_path},fork"
     exec_args="${wsl2_ssh_pageant_bin} $@"
   
     if ! ps x | grep -v grep | grep -q "${fork_args}"; then
       rm -f "${sock_path}"
       (setsid nohup socat "UNIX-LISTEN:${fork_args}" "EXEC:${exec_args}" &>/dev/null &)
     fi
   }
   
   # SSH
   export SSH_AUTH_SOCK="${SSH_DIR}/agent.sock"
   listen_socket "${SSH_AUTH_SOCK}"
   
   # GPG
   export GPG_AGENT_SOCK="${HOME}/.gnupg/S.gpg-agent"
   listen_socket "${GPG_AGENT_SOCK}" --gpg S.gpg-agent
   
   # GPG extra for agent forwarding to devcontainers in VS Code
   export GPG_AGENT_SOCK_EXTRA="${HOME}/.gnupg/S.gpg-agent.extra"
   listen_socket "${GPG_AGENT_SOCK_EXTRA}" --gpg S.gpg-agent.extra
   
   unset wsl2_ssh_pageant_bin
   ###
   

   You can also create this file inside a C: drive and then create a symlink to it, e.g.

   ln -s ~/.zprofile /mnt/c/WSL/scripts/.zprofile
   

   which enables sharing of the same file across multiple WSL distros.

6. Log out and back in to WSL.

7. Import your GPG key(s) inside WSL, just as you normally would. They're now ready to go!

Just for anyone who wants to use GPG CLI in WSL2, you can use gpg.exe directly, if it is not in path then /mnt/c/Program Files (x86)/GnuPG/bin/gpg.exe will work. Tested with Git, works perfectly.

Good to know, thanks @dingwen07!

i could not make this work :(