[Twisted-Python] User manipulation question....

Dmitry S. Makovey dmitry at athabascau.ca
Wed Jun 8 10:22:29 EDT 2005

On June 7, 2005 02:13 pm, James Y Knight wrote:
> On Jun 7, 2005, at 3:47 PM, Dmitry S. Makovey wrote:
> > 1. run server as privileged user so I can setuid(...) any time I
> > want or
> > 2. run two threads or so so that one thread is superuser-owned
> > and the other one (the one that responds to requests) is
> > non-privileged. First one will handle file operations since it
> > can change uid on-the-flight and come back to normal.
> I assume by "thread" you mean "process", because threads in a
> single process can't have different owners.

yes. sorry for confusion.

> > I would prefer to implement second solution but I'm puzzled on
> > where to start. Does twisted provide such capabilities
> > out-of-the-box?
> Nope. The way I'd implement it is by having the unprivileged server
> execute a setuid-root binary which handles the file operations on
> behalf of a user. That binary should verify the user authentication
> data the unprivileged server sends it, and then setuid from root to
> the end-user uid, and then perform the requested operations.

I thought about it, but I'm sort of hesitant because it involves extra 
execs etc. which might reflect on performance. But so far that's the 
only simple options I have. Other one would be to do fork early in 
main program and detach from main process leaving pipes for 
communication etc. but then I've got another bottleneck - file 

Thanks for idea I'll definitely give it a try I only wish that I could 
do it "less expensive way" :)

Dmitry Makovey
Web Systems Administrator
Athabasca University
(780) 675-6245

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