Network bind to port below 1024

1

I would like to listen and send on port 67. How can I make my flatpak ask for the root password to do this or how can I package a flatpak that can be run in this way?

This might be a general question: If I would like to create a HTTP or FTP server, how would I go about this?

Package:

I will have a look…
… It seems that not even Wireshark is able to do the trick: GitHub - flathub/org.wireshark.Wireshark

What can be done so that an application can open ports like 80 for HTTP, 67 for DHCP and so on?

2

It seems to be possible to run the app as root when the app is installed as root.

sudo -i flatpak install -y "`pwd`/$id.flatpak"
sudo -i flatpak run "$id"

However, then the persistet directories cannot be accessed during runtime.

3

you can’t. If you require uid 0 then flatpak isn’t the way to go.

4

I do not require root rights if I can just bind to port 67. Is there a way that flatpak has specific permissions for specific ports? Docker for example allows exposing certain ports.

5

Docker run as root.

Binding a privileged ip port require uid 0. You can not setcap either, and even then it wouldn’t work as it is python.