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Permissions for the FTP directories should be set to allow access for FTP users. You recall that three sets of permissions exist-read, write, and execute for the owner, the group, and others. To allow access by FTP users, the group and other permissions for directories should be set to both read and execute. The execute permission allows FTP users to access that directory, and the read permission allows listing the contents of the directory. Directories should not allow write permission by FTP users. You don't want them to be able to delete your directories or make new ones. For example, the FTP bin directory needs both read and execute permissions because FTP users have to access and execute its commands. This is particularly true for directories, such as pub, which hold the files for downloading. It must have both read and execute permissions set. You, as the owner of the directories, may need write permission to add new files or subdirectories. Of course, you only need this when you are making changes. To add further security, you could set these directories at just read and execute, even for the owner when you are not making changes. You can set all permissions to read and execute with the chmod command and the number 555 followed by the directory name. This sets the owner, group,
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and other permissions to read and execute. The permissions currently in place for the FTP directories set up by the anon package are designated by the number 755, giving the owner write permission.
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# chmod 555 /var/ftp/bin
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Permissions for files within the FTP bin directory and other special FTP directories can be more restrictive. Some files only need to be read, while others must be execute. Files in the FTP bin or lib directories only have to be execute. These could have their permissions set to 555. Files in the FTP etc directory such as passwd and group should have their permissions set to 111. They only have to be read. You always use the chmod command to set permissions for files, as shown in the following example. The adnon package sets these permissions at read and execute, 555.
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# chmod 111 /var/ftp/etc/passwd
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Both the wu-ftpd and ProFTPD daemons provide a set of FTP tools you can use to manage your FTP server. With the ftpshut command, you can smoothly shut down a running server, warning users of the shutdown well before it happens. ftpwho can tell you who is currently connected and what they are doing. ftpcount can give you the number of connections currently in effect. Although each daemon has its own set of tools, they perform the same action with much the same set of options. Tools provided by both ProFTPD and wu-ftpd have the same name and options, though ProFTPD provides more information on virtual hosts and has some added options.
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With the ftpshut command, you can have the FTP server shut down at a given time, rather than suddenly shutting it down by killing its process. This gives you the chance to warn users the server is shutting down and not to start any long downloads. ftpshut takes several options for specifying the time and including a warning message. ftpshut takes as its arguments the time until the shutdown, followed by the warning message you want sent to users. The time can be a word such as "now" that effects an immediate shutdown, a + sign with the number of minutes remaining, or a specific time of day indicated by an HHMM format, where HH is the hour in a 24-hour cycle and MM is the minute. The following example shuts down the FTP server in ten minutes, issuing a warning to users:
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ftpshut +10 "Shutdown in ten minutes"
Shutdown disables new FTP access ten minutes before a scheduled shutdown, though this can be changed using the -l option with the number of minutes you want. Five minutes before a scheduled shutdown, all current connections are disconnected. You can adjust the time with the -d options. The warning message is formatted at 75 characters, and you can use special formatting symbols for in-place substitutions of certain values in the warning message, such as the shutdown time. These symbols are called magic cookies. For example, %s is the shutdown time, %r is the time when new connections are refused, %d is the time when current connections are cut, %M is the maximum number of users, and %L is the local hostname.
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