relay ssh-agent and gpg-agent in windows

• install wslu for wsl https://wslutiliti.es/wslu/install.html

• set automounts option for WSL, enable all permissions for user owner. This way, wsl can use the .ssh/config file.

• symlink ssh config file from wsl to windows

ln -s /mnt/c/User/<user name>/.ssh/config ~/.ssh/config

• set up ssh-agent and gpg-agent on Windows and make wsl use those agents https://snapcraft.ninja/2020/07/30/gpg-ssh-keys-in-wsl2-with-yubikeys/ https://queensidecastle.com/guides/wsl-the-easy-way

  • my scripts after considering the above 2 files

NPIPERELAY_URL="https://github.com/NZSmartie/npiperelay/releases/download/v0.1/npiperelay.exe"
 
if [ -n "$WSL_DISTRO_NAME" ]; then
    APPDATA="$(wslvar appdata)"
    APPDATA="${APPDATA//\/\/}"
    NPIPERELAY_WIN="$APPDATA/wsl2-ssh-gpg-npiperelay.exe"
    NPIPERELAY="$(wslpath "$NPIPERELAY_WIN")"
 
    # Check if npiperelay exists, if not then download it
    if [ ! -f "$NPIPERELAY" ]; then
        curl -L -q -o "$NPIPERELAY" "$NPIPERELAY_URL"
    fi
 
 
    #####
    ## Autorun for the gpg-relay bridge
    ##
    # Set up gpg-agent relay if we have it available
    if [ -d ~/.gnupg ] && [ $(command -v socat) ] && [ $(command -v $NPIPERELAY) ]; then
    	echo "Bridge gpg-agent from windows"
    	export GPG_SOCK="$HOME/.gnupg/S.gpg-agent"
    	# Only set it up if it's not already running
    	if ! ps aux | grep -q "[s]ocat.*S.gpg-agent"; then
            [ -e $GPG_SOCK ] && rm $GPG_SOCK
            mkdir -p "$(dirname "$GPG_SOCK")"
            setsid socat UNIX-LISTEN:"$GPG_SOCK",fork EXEC:"$NPIPERELAY -ei -ep -s -a "'"'"$APPDATA"/gnupg/S.gpg-agent'"',nofork
		fi
    fi
 
    #####
    ## Autorun for the ssh-relay bridge
    ##
    # Set up ssh-agent if we have it available, and there isn't a real working SSH_AUTH_SOCK
    if [ -d ~/.ssh ] && [ $(command -v socat) ] && [ $(command -v $NPIPERELAY) ] && [ ! -S "$SSH_AUTH_SOCK" ]; then
    	echo "Bridge ssh-agent from windows"
    	export SSH_AUTH_SOCK=$HOME/.ssh/agent.sock
    	# Only set it up if it's not already running
    	if ! ps aux | grep -q "[s]ocat.*openssh-ssh-agent"; then
            [ -e $SSH_AUTH_SOCK ] && rm $SSH_AUTH_SOCK
            setsid socat UNIX-LISTEN:"$SSH_AUTH_SOCK",fork EXEC:"$NPIPERELAY -ei -s //./pipe/openssh-ssh-agent",nofork
		fi
    fi
fi 

• Add the above script to ~/.scripts/wsl2-ssh-gpg-agents.sh and then source it in ~/.profile . Then make sure to source ~/.profile in shell profile scripts (~/.bash_profile, ~/.zprofile, etc.) or shell rc scripts (~/.bashrc, ~/.zshrc, etc.) profile vs rc scripts

# relay ssh and gpg agents from windows
. ~/.scripts/wsl2-ssh-gpg-agents.sh

Note: GPG relay is not tested. Alternative things to try if it doesn’t work: https://r-pufky.github.io/docs/docs/apps/gpg/usage/windows-forward-gpg.html

• For gpg I used symlink windows exe to wsl