How do I switch users with their groups groups in Python?

Question

How do I switch to an admin-user account from this python script named root_and_user.py that was run with doas or sudo?

#!/usr/bin/env python3
from os import geteuid, seteuid
from subprocess import run
from sys import argv, exit

def touch(fname):
    with open(fname, 'a') as f:
        pass

#run this doas ./root_and_user.py 

if geteuid() == 0:
    touch("1.owned-by-root")
    touch("2.owned-by-root")
    seteuid(1000) 
    touch("1.owned-by-admin-user")
    touch("2.owned-by-admin-user")

I've written my own custom function, also called touch() that creates an empty file. 1000 is the id of admin_user. When I run the script with sudo or doas the files 1.owned-by-admin-user and 2.owned-by-admin-user are created but they still belong to the group root - although being owned by admin_user. My aim is to accomplish that 1.owned-by-admin-user and 2.owned-by-admin-user are not only owned by admin_user but also have a group admin_user. How might I accomplish that?

Use setegid/setegid to set the group

Chris Davies
– Chris Davies

2023-02-27 21:41:28 +00:00
Commented Feb 27, 2023 at 21:41 — Chris Davies
– Chris Davies, Commented Feb 27, 2023 at 21:41

John Smith · Accepted Answer · 2023-03-09 12:30:51Z

The os.chown() method can be used to modify the group ownership of files generated by your Python script. Try this:

#!/usr/bin/env python3
import os
from os import geteuid, seteuid
from subprocess import run
from sys import argv, exit

def touch(fname):
    with open(fname, 'a'):
        os.utime(fname, None)

#run this doas ./root_and_user.py 

if geteuid() == 0:
    touch("1.owned-by-root")
    touch("2.owned-by-root")
    seteuid(1000) 
    os.chown("1.owned-by-root", 1000, 1000) # change owner and group to admin_user
    os.chown("2.owned-by-root", 1000, 1000) # change owner and group to admin_user
    touch("1.owned-by-admin-user")
    touch("2.owned-by-admin-user")
    seteuid(0)
    os.chown("1.owned-by-admin-user", 1000, 1000) # change owner and group to admin_user
    os.chown("2.owned-by-dmin-user", 1000, 1000) # change owner and group to admin_user

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