[Linux-Anyway] Setuid root
- From: Horror Vacui <horrorvacui@xxxxxxx>
- To: Linux-Anyway@xxxxxxxxxxxxx
- Date: Thu, 26 Sep 2002 13:10:57 +0200
I never could quite understand how setuid and setgid works, never used
it before. As the only user I could su to root when I needed it. My
brother only needs to run the pptp client to connect to the ISP, and
until now I've been too lazy to have the client setuid root - I've told
him the root password, and told him to watch it - no commands but the
one I gave him. But now he's got a bit interested and wanted to know a
couple of commands more. I trust him, but shit happens - I'd like to
reduce the risk that he might forget he's root and harm the penguin. So
I did chmod 4655 pptp, which changed -rwxr-xr-x to -rwSr-xr-x. So when
you start it as normal user, it runs with the UID of the file owner,
right? Process listing says so. But then:
12:31:19 xxx@xxx:~/ >> (unknown)[2348]:
log[pptp_dispatch_ctrl_packet:pptp_ctrl.c:531]: Client connection
established.
(unknown)[2348]: log[pptp_dispatch_ctrl_packet:pptp_ctrl.c:637]:
Outgoing call established.
Failed to open /dev/ttya0: Permission denied
[1]+ Exit 7 /sbin/pptp alcatel
What the shell is happening? Why should it be able to open /dev/ttya0
when I su to root, but not this way? I know I could change the
permissions, but for all I know this shouldn't be necessary.
Cheers
Horror Vacui
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