execute as root ?

porous · 10-17-2003, 06:24 AM

how do you make a program which requires root previlages to be run by other users ...
i read it sometime back that you can change the permission of a binary file so that even when other users run it it will execute as root....

can any one help me .....

i think the ls -l for that looks something like

srwxr-xr-x < file name >

s-----> run as root ...

(from my memory , so i am not that sure )....

can someone help me .....

thx

iainr · 10-17-2003, 07:31 AM

You're thinking of SUID - Set UID where a file is owned by one user (e.g. root), has the SUID bit set and then when anyone executes it, it executes with root authority.

It looks like this
-rxsr-xr-x filename

You set it with chmod u+x <filename>

Note that you can set whole filesystems to not run suid binaries, so if it doesn't work, check /etc/fstab for nosuid.

Iain.

stickman · 10-17-2003, 08:54 AM

That would be "u+s" to set the UID bit.

iainr · 10-17-2003, 10:31 AM

Quote:

Originally posted by stickman
That would be "u+s" to set the UID bit.

Sorry - my typo.

porous · 10-18-2003, 04:54 AM

thx guys ...

i got it....

porous · 10-18-2003, 05:30 AM

one more thing , is there any security issuse , in addin a user to the roots group and setting the permission as

-rwsr-x-- < file name >

so that only the user i add to roots group will have the permission...

another one is this .................

if i change the group for a program which initially belonged to the roots group (not the owner ) , will there be any confilits ...