GPG Suite and gpg-agent forwarding

I had to fight a little with GPG Suite (Mac) and forwarding gpg-agent to a Ubuntu 16.04 target. This post describes what ended up working for me.

Source Machine:

• macOS Sierra 10.12.6
• GPG Suite 2017.1 (2002)

Target Machine:

• gpg2 installed on Ubuntu 16.04 (sudo apt-get install gpg2 -y)

Source machine:

File: ~/.gnupg/gpg-agent.conf

Add this lines:

extra-socket /Users/[user]/.gnupg/S.gpg-agent.remote

File: ~/.ssh/config

Add these lines:

RemoteForward /home/[user]/.gnupg/S.gpg-agent /Users/[user]/.gnupg/S.gpg-agent.remote
ExitOnForwardFailure Yes

Restart gpg-agent:

gpgconf --kill gpg-agent
gpgconf --launch gpg-agent

Destination Machine:

File: /etc/ssh/sshd_config

Add this line:

StreamLocalBindUnlink yes

Restart sshd:

sudo systemctl restart sshd

This article helped a lot while I was troubleshooting.