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Puzzling permission issue

 
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Top Forums UNIX for Dummies Questions & Answers Puzzling permission issue
# 8  
Old 11-23-2011
Quote:
1)the question is why the networked file system behave differently, 2)and is the behavior normal?
1) It is not ! You prove me it is then...
Copying to /tmp ...
Most systems have /tmp permissions set like:
Code:
drwxrwxrwx  95 bin        bin           5120 Nov 23 16:16 /tmp
drwxrwxrwt 9 root root 4096 Nov 23 14:32 /tmp
etc...

Which is not the case of your home directory...
# 9  
Old 11-23-2011
Quote:
Originally Posted by vbe
1) It is not ! You prove me it is then...
Unless I missed something, this trace of his:
Code:
dqscs04:/home/jhzhang:64 % ls -l /etc/hosts
-rw-r--r-- 1 root root 179 Jun 28 15:27 /etc/hosts
dqscs04:/home/jhzhang:62 % cp -p /etc/hosts .
cp: preserving permissions for `./hosts': Operation not permitted
dqscs04:/home/jhzhang:60 % ls -l hosts
-rw------- 1 root root 179 Jun 28 15:27 hosts

shows him creating a file owned by root in his home directory by cp -p when not logged in as root, which seems at least a little weird.
# 10  
Old 11-23-2011
But what does this mean then?
Code:
cp: preserving permissions for `./hosts': Operation not permitted

I am finding it not clear, He should have shown us his UID to undestand if any issues... (I don't see...) because nowhere does he say under which account he is looking or trying things...
# 11  
Old 11-23-2011
When he created a file with cat /etc/hosts > ~/localfile instead, it did this:

Code:
dqscs04:/home/jhzhang:67 % ls -ld ~/
drwxr-xr-x 107 jhzhang adusers 20480 Nov 16 17:14 /home/jhzhang/

dqscs04:/home/jhzhang:69 % cat /etc/hosts > ~/localfile
dqscs04:/home/jhzhang:70 % ls -l localfile
-rw-r--r-- 1 jhzhang adusers 179 Nov 17 09:17 localfile

So he isn't logged in as root.

So cp -p is allowing him to create root-owned files even though he's not root, and even though it causes an error message. Very odd! Smilie

---------- Post updated at 10:07 AM ---------- Previous update was at 09:59 AM ----------

If it somehow allows him to change the ownership but still enforces file permissions, then cp might be locking itself out of the file by doing so. If it changed the ownership first, it'd no longer have permissions to change the permissions, causing the error.
# 12  
Old 11-23-2011
The normal situations is seen when I copy the file to /tmp --- the ownership is changed from root to that of the copier, and the permission is preserved. Need to find a way to correct the network file system (mount point /home/jhzhang) behavior.

The wrongful network file system behavior includes the ability to delete the root owned file with permission 600 by the copier -- my regular user.
# 13  
Old 11-23-2011
Code:
ant:/home/vbe $ chmod 600 0000
ant:/home/vbe $ ll 0000
-rw-------   1 vbe        bin             12 Nov 23 17:43 0000
ant:/home/vbe $ chown root:root 0000
ant:/home/vbe $ r ll
ll 0000
-rw-------   1 root       root            12 Nov 23 17:43 0000
ant:/home/vbe $ rm 0000
0000: 600  mode ? (y/n) y
ant:/home/vbe $ r ll
ll 0000
0000 not found
ant:/home/vbe $

# 14  
Old 11-23-2011
By using cp -p, you're telling it to preserve the original owner. It shouldn't let you do that unless you're root. I don't know why it does.
Quote:
Originally Posted by nugulus
The wrongful network file system behavior includes the ability to delete the root owned file with permission 600 by the copier -- my regular user.
That's normal. You don't need access or ownership of a file to delete a file owned by root, all you need is write permissions to the directory containing it.

/tmp/ is different because /tmp/ usually has the sticky bit set on it. Only the file's owner is allowed to delete a file in /tmp/.
 
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