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To change the ownership of a file, use the chown command. The structure of this command is as follows: chown {user|:group} file For example, to make user linda owner of rootsfile, the command chown linda rootsfile must be used. To change the group owner of somefile to the group sales, the chown .sales somefile command is used. Note that for changing group ownership, the chgrp command can be used as an alternative. Therefore, chown .sales somefile does the same thing as chgrp sales somefile. When using chgrp, the name of the group does not need to be preceded by a dot. By default, chown and chgrp apply only to the file or directory on which they are used. However, you can use the commands to work recursively as well: chown -R linda somedir makes user linda owner of all files in somedir and all subdirectories of it.
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When working with group ownership, you should be aware of how group ownership is handled. By default, the primary group of the user who creates a new file becomes the group owner of that file. If, however, the user is a member of more than one group, this default setting can be manipulated. When a user issues the newgrp command, he can change the primary group setting on a temporary basis. The following steps show what happens next:
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CHAPTER 5 CONFIGURING YOUR SERVER FOR SECURITY
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1. Log in as some normal user on your computer. Then use the groups command from a console window to get an overview of all groups that you are currently a member of. The primary group is listed first. If you haven t modified anything for this user, it will have the same name as your user account. Listing 5-4 is an example of this output. Listing 5-4. The groups Command Always Shows Your Primary Group First sander@RNA:~$ groups sander adm dialout cdrom floppy audio dip video plugdev scanner lpadmin admin 2. From the console window, issue the touch newfile command to create a new file with the name newfile. Then use ls -l newfile to display the ownership information for newfile. You will see that the primary group is set as the owner of the file (see Listing 5-5). Listing 5-5. The User s Primary Group Is Always Set As Its Owner sander@RNA:~$ ls l newfile -rw-r--r-- 1 sander sander 0 2007-07-28 10:05 newfile
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3. Use su to become root. Then use groupadd to create a new group (for example, use groupadd -g 901 sales to create a group with the name sales and group ID 901). Next, as root, use usermod -g 901 youruser to make youruser (the user you used in step 1) a member of that group. After changing this group information, use exit to close the su session and become the normal user account again. 4. As the normal user, use groups again to get an overview of all groups you are currently a member of. The new group should appear now, probably as the last group in the list. 5. As the normal user, use newgrp yournewgroup to set the primary group to your new group on a temporary basis. You can use the groups command to check this; the new group should now be listed first. You ll also see that if you create a new file (use touch somenewfile), the new group will be group owner of the new file. This ensures that all users who are members of the same group can do the same thing to this file.
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Until now, I ve covered just the three basic Linux permissions. But there are more. To start with, Linux has a set of advanced permissions, and this section describes the working of these permissions. Before diving into detail, the following list provides a short overview of the advanced permissions and the way they re used: SUID: If this permission is applied to an executable file (also known as Set User ID and setuid ), the user who executes that file will have the permissions of the owner of the file while he is executing it. You can see that SUID is a very dangerous permission that, if wrongly applied, creates serious back doors on your server. On the other hand, some applications /usr/bin/passwd, for example can t function without it because these applications need the permissions of their owner root to be able to do their job.
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