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🐚 urtty: PTY via %lick

Screen recording

Description

This is a repo with a collection of tools necessary to funnel a shell on a ship's host through a fakezod's %lick vane to allow shell access to the host via urbit webapp.

On init by the client urbit app, the backend app creates a shell process. Byte arrays are b64'd and wrapped in json, then passed from the process output into a unix socket in the pier directory. The urbit app uses %lick to pass data between the frontend and backend, and the frontend displays decoded data using xterm.js. Commands from the client are similarly encoded and passed to the backend, which passes them into the PTY session.

This repo contains a standalone Go script (urtty-be/) which will connect to the lick socket and generate PTY sessions; note however that the path is hardcoded to a fakezod in the root dir. Just replace the sockPath var in main.go to use another ship.

Security note

Urbit apps are not yet sandboxed! Don't install this on a ship with anything else installed.

Usage

  • Build the frontend: ./dev.sh
  • Install app: In your fakezod or other ship, |new-desk %urtty, |mount %urtty, copy the contents of urtty-desk into the mounted desk, then |commit %urtty and |install our %urtty
  • Run the backend: cd urtty-be && go run main.go
  • Log into ship, go to /docket/upload, select urtty desk and upload the ./web directory