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gpg-agent system integration ============================ Since 2.1.x, gpg and most related processes will auto-launch gpg-agent if needed. These auto-launched processes will inherit whatever environment they started from, and they will not terminate automatically. systemd ======= Since 2.1.17, users on machines with systemd will have their gpg-agent process launched automatically by systemd's user session, upon first access of any of the expected gpg-agent sockets (including the ssh socket). systemd will also cleanly tear this process down at session logout. If dbus-user-session and pinentry-gnome3 packages are installed, then all user interaction with this systemd-managed gpg-agent process (e.g. prompting for passwords or confirmations, etc) will take place over the d-bus session, for better integration with graphical environments like GNOME. Users who don't want systemd to manage their gpg-agent in this way for all future sessions should do: systemctl --user mask --now gpg-agent.service gpg-agent.socket gpg-agent-ssh.socket gpg-agent-extra.socket gpg-agent-browser.socket Doing this means that gpg-agent will fall back to its manual mode of operation. (This decision can be reversed by the user with "unmask" instead of "mask") See systemctl(1) for more details about managing the gpg-agent*.socket units. ssh-agent emulation =================== gpg-agent offers an ssh-agent emulation which can be achieved by setting the environment variable SSH_AUTH_SOCK to: /run/user/$(id -u)/gnupg/S.gpg-agent.ssh (replace $(id -u) with the user's numeric user ID, of course). But ssh doesn't have a way to tell ssh-agent how to prompt the user when necessary; the systemd-managed gpg-agent process will only know how to prompt the user if you have dbus-user-session and pinentry-gnome3 installed. This is the recommended configuration for gpg-agent's ssh-agent emulation on desktop machines running systemd, and doesn't need any additional configuration. However, if dbus-user-session and pinentry-gnome3 are not in use, by default the systemd-managed gpg-agent will not know how to get feedback from the user when a request is first received by ssh. You can give it a hint for all future ssh connections by running: gpg-connect-agent updatestartuptty /bye You may wish to do this in the login scripts for your user session if you run systemd without dbus-user-session and pinentry-gnome3, and you plan to use gpg-agent's ssh-agent emulation. Manual gpg-agent startup and teardown ===================================== Any user who wants to launch gpg-agent manually (e.g., to talk to it with a tool from outside the GnuPG suite) and is *not* using systemd should first ensure that it is launched with: gpgconf --launch gpg-agent If gpg-agent is launched manually or automatically (but not supervised by systemd), you probably want to ensure that it terminates when your session ends with: gpgconf --kill gpg-agent If you're not using systemd, you may wish to add this to your session logout scripts. -- Daniel Kahn Gillmor <dkg@fifthhorseman.net>, Mon, 23 Jan 2017 22:56:08 -0500