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If you have files you want other users to have access to, you not only need to set permissions for that file, you also must make sure the permissions are set for the directory in which the file is located. To access your file, a user must first access the file s directory. The same applies to parents of directories. Although a directory may give permission to others to access it, if its parent directory denies access, the directory cannot be reached. Therefore, you must pay close attention to your directory tree. To provide access to a directory, all other directories above it in the directory tree must also be accessible to other users.
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In addition to the read/write/execute permissions, you can also set ownership permissions for executable programs. Normally, the user who runs a program owns it while it is running, even though the program file itself may be owned by another user. The Set User ID permission allows the original owner of the program to own it always, even while another user is running the program. For example, most software on the system is owned by the root user, but is run by ordinary users. Some such software may have to modify files owned by the root. In this case, the ordinary user would need to run that program with the root retaining ownership so the program could have the permissions to change those root-owned files. The Group ID permission works the same way, except for groups. Programs owned by a group retain ownership, even when run by users from another group. The program can then change the owner group s files. There is a potential security risk involved in that you are essentially giving a user some limited root-level access.
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For the ownership permissions, you add another octal number to the beginning of the octal digits. The octal digit for User ID permission is 4 (100) and for Group ID, it is 2 (010), or use 6 to set both (110). The following example
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sets the User ID permission to the pppd program, along with read and execute permissions for the owner, group, and others: # chmod 4555 /usr/sbin/pppd
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Ownership Permissions Using Symbols
To add both the User ID and Group ID permissions to a file, you use the s option. The following example adds the User ID permission to the pppd program, which is owned by the root user. When an ordinary user runs pppd, the root user retains ownership, allowing the pppd program to change root-owned files. # chmod +s /usr/sbin/pppd The Set User ID and Set Group ID permissions show up as an s in the execute position of the owner and group segments. Set User ID and Group ID are essentially variations of the execute permission, x. Read, write, and User ID permission would be rws instead of just rwx.
# ls -l /usr/sbin/pppd -rwsr-sr-x 1 root root 184412 Jan 24 22:48 /usr/sbin/pppd
Sticky Bit Permissions
One other special permission provides for greater security on directories, the sticky bit. Originally, the sticky bit was used to keep a program in memory after it finished execution to increase efficiency. Current Linux systems ignore this feature. Instead, it is used for directories to protect files within them. Files in a directory with the sticky bit set can only be deleted or renamed by the root user or the owner of the directory.
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As with ownership, for sticky bit permissions, you add another octal number to the beginning of the octal digits. The octal digit for the sticky bit is 1 (001). The following example sets the sticky bit for the myreports directory. : # chmod 1755 /home/dylan/myreports
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