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Anonymous FTP: anon
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An anonymous FTP site is essentially a special kind of user on your system with publicly accessible directories and files in its home directory. Anyone can log in to this account and access its files. Because anyone can log in to an anonymous FTP account, you must be careful to restrict a remote FTP user to only the files on that anonymous FTP directory. Normally, a user's files are interconnected to the entire file structure of your system. Normal users have write access that lets them create or delete files and directories. The anonymous FTP files and directories can be configured in such a way that the rest of the file system is hidden from them, and remote users are given only read access. In ProFTPD, this is achieved through configuration directives placed in its configuration file. An older approach used by wu-ftpd and implemented by the anon package involves having copies of certain system configuration, command, and libraries files placed within subdirectories of the FTP home directory. Restrictions placed on those sudirectories then control access by other users. Within the FTP home directory, you then have a publicly accessible directory that holds the files you want to make available to remote users. This directory usually has the name pub, for public. An FTP site is made up of an FTP user account, an FTP home directory, and certain copies of system directories containing selected configuration and support files. Newer FTP daemons, such as ProFTPD, do not need the system directories and support files. Most distributions, including Red Hat, have already set up an FTP user account when you installed your system. On Red Hat, you can use the anon RPM package to set up the home directory and the copies of the system directories. If you do not have access to the anon package, you may have to create these system directories yourself.
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To allow anonymous FTP access by other users to your system, you must have a user account named FTP. Red Hat has already created this account for you. If your system does not have such an account, you will have to create one. You can then place restrictions on the FTP
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account to keep any remote FTP users from accessing any other part of your system. You must also modify the entry for this account in your /etc/passwd file to prevent normal user access to it. The following is the entry you find in your /etc/passwd file on Red Hat systems that sets up an FTP login as an anonymous user:
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The asterisk in the password field blocks the account, which prevents any other users from gaining access to it, thereby gaining control over its files or access to other parts of your system. The user ID, 14, is a unique ID. The comment field is FTP User. The login directory is /var/ftp. When FTP users log in to your system, this is the directory in which they are placed. If a home directory has not been set up, create one and then change its ownership to the FTP user with the chown command. The group ID is the ID of the ftp group, which is set up only for anonymous FTP users. You can set up restrictions on the ftp group, thereby restricting any anonymous FTP users. Here is the entry for the ftp group you find in the /etc/group file. If your system does not have one, you should add it.
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As previously noted, on Red Hat the FTP home directory is named ftp and is placed in the /var directory. When users log in anonymously, they are placed in this directory. An important part of protecting your system is preventing remote users from using any commands or programs not in the restricted directories. For example, you would not let a user use your ls command to list filenames because ls is located in your /bin directory. At the same time, you want to let the FTP user list filenames using an ls command. Newer FTP daemons like ProFTPD solve this problem by creating secure access to needed system commands and files, while restricting remote users to only the FTP site's directories. Another more traditional solution, used by wu-ftpd, is to create copies of certain system directories and files needed by remote users and to place them in the ftp directory where users can access them. A bin directory is placed in the ftp directory and remote users are restricted to it, instead of the system's bin directory. Whenever they use the ls command, remote users are using the one in ftp/bin, not the one you use in /bin. On Red Hat, the anon RPM package will set up these copies of system directories and files. Otherwise, you may have to create these directories and support files yourself. On Red Hat, the anon package installs etc, bin, and lib directories in the /var/ftp directory. These contain localized versions of system files needed to let an FTP client execute certain FTP commands, such as listing files or changing directories. The ftp/etc directory contains versions of the password and group configuration files, the ftp/bin directory contains copies of shell and compression commands, and the ftp/lib directory holds copies of system libraries. The directories set up by the anon package are shown here:
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