su with no password

samsolaris · 10-26-2004, 05:10 PM

Hi,

I'm trying to execute a shell with my user profile from another shell with a diffrent user (not root). Obviously it doesn't work because I have to enter my password.
Someone knows how to make so that it doesn't ask my password?

Thanxxx,

Sam

serz · 10-26-2004, 05:34 PM

I don't think you can do that ...

jlliagre · 10-26-2004, 05:48 PM

You can write a small C program launching your shell, and set the setuid bit to it.
If you have access to the root account, just use sudo.
You can also allow the other user rsh access to your account, but this is very unsecure.

samsolaris · 10-27-2004, 03:27 PM

HI,

I have written the C program but that does'nt work! I always have to enter the password!
I choose your second solution.
I think that it is the only solution.

Thanks a lot Jlliagre.

Sam

jlliagre · 10-27-2004, 04:02 PM

Show me your C program, and I'll fix it.
I'm positive it can be done !

samsolaris · 10-27-2004, 04:15 PM

#include <stdio.h>
#include <stdlib.h>

main()
{
system("/PATH/TO/MY/script.sh")
}

jlliagre · 10-28-2004, 01:51 AM

Code:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define TARGET_UID 1000

main()
{
  setuid(TARGET_UID);
  setgid(TARGET_UID);
  setegid(TARGET_UID);
  seteuid(TARGET_UID);
  system("/PATH/TO/MY/script.sh");
}

Replace 1000 with your userid in the define, compile the program and give the binary root suid, it should work.

samsolaris · 10-28-2004, 11:06 AM

Yeah, that work!

Comme on dit => T'es une bête! ;-)

Sam

jlliagre · 10-28-2004, 11:18 AM