Linux Security Cookbook [Electronic resources] نسخه متنی

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Linux Security Cookbook [Electronic resources] - نسخه متنی

Daniel J. Barrett, Robert G. Byrnes, Richard Silverman

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Recipe 5.10 Sharing Files Using Groups



5.10.1 Problem



Two or more users want to share files, both
with write privileges.


5.10.2 Solution


Create a group containing only those users, say, smith, jones, and
ling:

/etc/group:
friends:x:200:smith,jones,ling

Create the shared file in a directory writable by this group:

jones$ cd
jones$ mkdir share
jones$ chmod 2770 share
jones$ chgrp friends share
jones$ ls -ld share
drwxrws--- 2 jones friends 4096 Apr 18 20:17 share/
jones$ cd share
jones$ touch myfile
jones$ chmod 660 myfile
jones$ ls -l myfile
-rw-rw---- 1 jones friends 0 Apr 18 20:18 myfile

Users smith and ling can now enter the directory and modify
jones's file:

smith$ cd ~jones/share
smith$ emacs myfile


5.10.3 Discussion


smith, jones, and ling should consider setting their

umasks so files they create are group
writable, e.g.:

$ umask 007
$ touch newfile
$ ls -l newfile
-rw-rw---- 1 smith 0 Jul 17 23:09 newfile

The
setgid bit on the directory (indicated by
mode 2000 for chmod, or
"s" in the output from ls
-l
) means that newly created files in the directory will be
assigned the group of the directory. The applies
to newly created subdirectories as well.

To enable this behavior for an entire filesystem, use the
grpid
mount option. This option can appear on the command line:

# mount -o grpid ...

or in /etc/fstab:

/dev/hdd3   /home   ext2    rw,grpid    1 2


5.10.4 See Also


group(5), chmod(1), chgrp(1), umask(1).

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