topic Re: -rwsr-xr-x -> special permissions in Operating System - HP-UX

-rwsr-xr-x -> special permissions

Manuales — Fri, 03 Feb 2006 10:04:24 GMT

Hi, can you tell me how can i put next permissions ... i mean, i have a file with permissions as follows:
rwxr-xr-x
and i want have them as follows:

-rwsr-xr-x

i know that is something like sticky ...

Thanks !!!
Man.

Re: -rwsr-xr-x -> special permissions

Tomek Gryszkiewicz — Fri, 03 Feb 2006 10:07:27 GMT

chmod u+x file
This is not a "sticky" -- this is suid, which means the program is executed as the file owner. Be careful on it, it is potentialy dangerous!

--
Grych

Re: -rwsr-xr-x -> special permissions

Tomek Gryszkiewicz — Fri, 03 Feb 2006 10:07:36 GMT

chmod u+s file
This is not a "sticky" -- this is suid, which means the program is executed as the file owner. Be careful on it, it is potentialy dangerous!

--
Grych

Re: -rwsr-xr-x -> special permissions

Pete Randall — Fri, 03 Feb 2006 10:08:13 GMT

That, in fact, is the setuid bit. It allows the script to be run as the owner, usually used to allow someone root authority when executing the script. See "man chmod" for details.

Pete

Re: -rwsr-xr-x -> special permissions

James R. Ferguson — Fri, 03 Feb 2006 10:10:52 GMT

Hi Manuales:

Have a look at the manpages for 'chmod(1)'. There is a good explanation of the bit mapping there.

Regards!

...JRF...

Re: -rwsr-xr-x -> special permissions

Robert-Jan Goossens_1 — Fri, 03 Feb 2006 10:14:45 GMT

Hi,

check the chmod man page.

# chmod 4755 file

Regards,
Robert-Jan

Re: -rwsr-xr-x -> special permissions

Manuales — Fri, 03 Feb 2006 10:17:29 GMT

Hi ...

I executed:
chmod u+x prueba.txt

The result was:
-rwxrw-r--

how can i put "s" letter????

Thanks ... Man.

Re: -rwsr-xr-x -> special permissions

Ivan Ferreira — Fri, 03 Feb 2006 10:20:21 GMT

SUID - for directories, no effect. For files, the file is executed as the owner of the file instead of the user that runs the program.

SGID - For directories, the files creates in the directory, inherit the group ownershipd. For files the file is executed as the group owner of the file instead of the user that runs the program.

STICKY - For programs, depend of the Unix, for Directories, used on public directories, allows only the deletion of a file to root and the owner of the file.

Re: -rwsr-xr-x -> special permissions

James R. Ferguson — Fri, 03 Feb 2006 10:21:59 GMT

Hi (again) Manuales:

You are trying to set the 'setuid' bit. Do:

# chmod 4755 filename

(or):

# chmod u+s filename

...to what you currently have.

Regards!

...JRF...

Re: -rwsr-xr-x -> special permissions

Ivan Ferreira — Fri, 03 Feb 2006 10:25:00 GMT

SUID - chmod 4XXX filename
SGID - chmod 2XXX filename
STICKY - chmod 1XXX filename

Where XXX is the normal permissions that you want to establish, for example 750.

Re: -rwsr-xr-x -> special permissions

Manuales — Fri, 03 Feb 2006 10:25:13 GMT

Thanks all !!!!

Have a good day !!!

:0)

Manuales ..

Re: -rwsr-xr-x -> special permissions

Tomek Gryszkiewicz — Fri, 03 Feb 2006 10:37:15 GMT

Sorry my mistake, should be +s of course!

Re: -rwsr-xr-x -> special permissions

Manuales — Fri, 03 Feb 2006 10:55:49 GMT

What does mean this permissiions: -rwsr-xr-x ?

Manuales.

Re: -rwsr-xr-x -> special permissions

James R. Ferguson — Fri, 03 Feb 2006 11:08:30 GMT

Hi Manuales:

The "man" pages should be your nickname :-))

There is a wealth of informtion there, especially if you follow the "See Also" section at the bottom. In this case, if you look at 'chmod(2)' you can find explanations for what 'setuid', 'setgid' and 'sticky' bits do:

http://docs.hp.com/en/B2355-60127/chmod.2.html

In the case of the 'setuid' bit, when set for an executable file, the privilege of the file's owner is given to the process running the executable file.

That is, if 'root' owns the executable and you (a normal user) are allowed to execute the file, *and* the 'setuid' bit is on, then you gain 'root' privilege while running the executable.

Regards!

...JRF...