it's em!•9mo ago

Drop permissions

I'd like to harden my deno app a bit, but specifying permissions manually gets repetitive. Is there a way for me to run with -A, parse my configs, and then drop all permissions I don't need before loading the rest of the app? Ex. the configuration will contain a database path, so I should keep the r/w permissions for that, but not any other files.

2 Replies

marvinh.•9mo ago

No, reversing already given permissions in the same process is not possible. you can limit the read + write permissions to certain files by passing a file path, see https://docs.deno.com/runtime/manual/basics/permissions

cknight•9mo ago

You can also setup a deno task in your deno.json and specify specific permissions there. E.g. in your deno.json you have:

{
  "tasks": {
     "start": "deno run --allow-read=./config.json,./my.db --allow-write=./my.db mod.ts",
   },
}

{
  "tasks": {
     "start": "deno run --allow-read=./config.json,./my.db --allow-write=./my.db mod.ts",
   },
}

Then on the command line you can just do:

deno task start

deno task start