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Showing content from https://github.com/BlackReloaded/wsl2-ssh-pageant below:

BlackReloaded/wsl2-ssh-pageant: bridge between windows pageant and wsl2

⚠️ I no longer own a Windows PC, so this project has been needless for me. For this reason i will archive this project. ⚠️

I use a Yubikey to store a GPG key pair and I like to use this key pair as my SSH key too. GPG on Windows exposes a Pageant style SSH agent and I wanted a way to use this key within WSL2.

In order to use wsl-ssh-pageant you must have installed socat and ss on your machine.

For example, on Ubuntu you can install these by running: sudo apt install socat iproute2

1. Download latest version from release page and copy wsl2-ssh-pageant.exe to your windows home directory (or other location within the windows file system). Then simlink to your $HOME/.ssh directory for easy access

   windows_destination="/mnt/c/Users/Public/Downloads/wsl2-ssh-pageant.exe"
   linux_destination="$HOME/.ssh/wsl2-ssh-pageant.exe"
   wget -O "$windows_destination" "https://github.com/BlackReloaded/wsl2-ssh-pageant/releases/latest/download/wsl2-ssh-pageant.exe"
   # Set the executable bit.
   chmod +x "$windows_destination"
   # Symlink to linux for ease of use later
   ln -s $windows_destination $linux_destination

2. Add one of the following to your shell configuration (for e.g. .bashrc, .zshrc or config.fish). For advanced configurations consult the documentation of your shell.

SSH:

export SSH_AUTH_SOCK="$HOME/.ssh/agent.sock"
if ! ss -a | grep -q "$SSH_AUTH_SOCK"; then
  rm -f "$SSH_AUTH_SOCK"
  wsl2_ssh_pageant_bin="$HOME/.ssh/wsl2-ssh-pageant.exe"
  if test -x "$wsl2_ssh_pageant_bin"; then
    (setsid nohup socat UNIX-LISTEN:"$SSH_AUTH_SOCK,fork" EXEC:"$wsl2_ssh_pageant_bin" >/dev/null 2>&1 &)
  else
    echo >&2 "WARNING: $wsl2_ssh_pageant_bin is not executable."
  fi
  unset wsl2_ssh_pageant_bin
fi

GPG:

export GPG_AGENT_SOCK="$HOME/.gnupg/S.gpg-agent"
if ! ss -a | grep -q "$GPG_AGENT_SOCK"; then
  rm -rf "$GPG_AGENT_SOCK"
  wsl2_ssh_pageant_bin="$HOME/.ssh/wsl2-ssh-pageant.exe"
  if test -x "$wsl2_ssh_pageant_bin"; then
    (setsid nohup socat UNIX-LISTEN:"$GPG_AGENT_SOCK,fork" EXEC:"$wsl2_ssh_pageant_bin --gpg S.gpg-agent" >/dev/null 2>&1 &)
  else
    echo >&2 "WARNING: $wsl2_ssh_pageant_bin is not executable."
  fi
  unset wsl2_ssh_pageant_bin
fi

SSH:

set -x SSH_AUTH_SOCK "$HOME/.ssh/agent.sock"
if not ss -a | grep -q "$SSH_AUTH_SOCK";
  rm -f "$SSH_AUTH_SOCK"
  set wsl2_ssh_pageant_bin "$HOME/.ssh/wsl2-ssh-pageant.exe"
  if test -x "$wsl2_ssh_pageant_bin";
    setsid nohup socat UNIX-LISTEN:"$SSH_AUTH_SOCK,fork" EXEC:"$wsl2_ssh_pageant_bin" >/dev/null 2>&1 &
  else
    echo >&2 "WARNING: $wsl2_ssh_pageant_bin is not executable."
  end
  set --erase wsl2_ssh_pageant_bin
end

GPG:

set -x GPG_AGENT_SOCK "$HOME/.gnupg/S.gpg-agent"
if not ss -a | grep -q "$GPG_AGENT_SOCK";
  rm -rf "$GPG_AGENT_SOCK"
  set wsl2_ssh_pageant_bin "$HOME/.ssh/wsl2-ssh-pageant.exe"
  if test -x "$wsl2_ssh_pageant_bin";
    setsid nohup socat UNIX-LISTEN:"$GPG_AGENT_SOCK,fork" EXEC:"$wsl2_ssh_pageant_bin --gpg S.gpg-agent" >/dev/null 2>&1 &
  else
    echo >&2 "WARNING: $wsl2_ssh_pageant_bin is not executable."
  end
  set --erase wsl2_ssh_pageant_bin
end

If this is the first time you using yubikey with windows with gpg4win, please follow the instructions in the link https://developers.yubico.com/PGP/SSH_authentication/Windows.html

| Make sure ssh support is enabled in the gpg-agent.conf and restart gpg-agent with the following command

gpg-connect-agent killagent /bye
gpg-connect-agent /bye

If ssh,ssh-add,gpg etc are very slow (~15-25 seconds) check that wsl2-ssh-pageant resides on the windows file system. This is due to an issue with the WSL interop documented here and here

Some of the code is copied from benpye's wsl-ssh-pageant. This code shows how to communicate to pageant.

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