Installing and Administering Internet Services

Chapter 2 49

Installing and Conﬁguring Internet Services

Conﬁguring Anonymous ftp Access

2. Create the subdirectory /usr/bin under the ftp home directory:

cd /home/ftp

mkdir usr

cd usr

mkdir bin

3. Copy the ls and pwd commands from /sbin to ˜ftp/usr/bin, and

set the permissions on the commands to 0111 (executable only):

cp /sbin/ls /home/ftp/usr/bin

cp /sbin/pwd /home/ftp/usr/bin

chmod 0111 /home/ftp/usr/bin/ls

chmod 0111 /home/ftp/usr/bin/pwd

4. Set the owner of the ˜ftp/usr/bin and ˜ftp/usr directories to

root, and set the permissions to 0555 (not writeable):

chown root /home/ftp/usr/bin

chmod 0555 /home/ftp/usr/bin

chown root /home/ftp/usr

chmod 0555 /home/ftp/usr

5. Create the subdirectory etc under the ftp home directory:

cd /home/ftp

mkdir etc

6. Copy /etc/passwd and /etc/group to ˜ftp/etc. These ﬁles are

required by the ls command, to display the owners of ﬁles and

directories under ˜ftp.

cp /etc/passwd /home/ftp/etc

cp /etc/group /home/ftp/etc

7. Replace the password ﬁeld in all entries in /home/ftp/etc/passwd

with *, and delete the shell ﬁeld from the end of each entry:

ftp:*:500:guest:anonymous ftp:/home/ftp:

acb:*:8996:20::/home/acb:

8. Replace the password ﬁeld in all entries in /home/ftp/etc/group

with *:

users:*:20:acb

guest:*:21:ftp

9. Set the owner of the ﬁles in ˜ftp/etc to root, and set the

permissions to 0444 (read only):

chown root /home/ftp/etc/passwd

chmod 0444 /home/ftp/etc/passwd

chown root /home/ftp/etc/group

chmod 0444 /home/ftp/etc/group

10.Set the owner of ˜ftp/etc to root, and set the permissions to 0555

(not writeable):