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The ftp/etc directory holds a version of your passwd and group files specially configured for FTP access. Again, the idea is to prevent any access to the original files in the /etc directory by FTP users. The ftp/etc/passwd file should not include any entries for regular users on your system. All entries should have their passwords set to * to block access. The group file should not include any user groups, and all passwords should be set to *.
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ftp/etc/passwd root:*:0:0::: bin:*:1:1::: operator:*:11:0::: ftp:*:14:50::: nobody:*:99:99::: ftp/etc/group root::0: bin::1: daemon::2: sys::3: adm::4: ftp::50:
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If, for some reason, you do not have access to the anon package, you can set up the anonymous FTP directories yourself. Again, remember, if you are using ProFTPD, you do not need any of these files, except for an FTP home directory. You must use the chmod command to change the access permissions for the directories so remote users cannot access the rest of your system. Create an ftp directory and use the chmod command with the permission 555 to turn off write access: chmod 555 ftp. Next, make a new bin directory in the ftp directory, and then make a copy of the ls command and place it in ftp/bin. Do this for any commands you want to make available to FTP users. Then create an ftp/etc directory to hold a copy of your passwd and group files. Again, the idea is to prevent any access to the original files in the /etc directory by FTP users. The ftp/etc/passwd file should be edited to remove any entries for regular users on your system. All other entries should have their passwords set to * to block access. For the group file, remove all user groups and set all passwords to *. Create an ftp/lib directory, and then make copies of the libraries you need to run the commands you placed in the bin directory.
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A directory named pub, located in the FTP home directory, usually holds the files you are making available for downloading by remote FTP users. When FTP users log in, they are placed in the FTP home directory (/var/ftp on Red Hat), and they can then change to the pub directory to start accessing those files (/var/ftp/pub on Red Hat). Within the pub directory, you can add as many files and directories as you want. You can even designate some directories as upload directories, enabling FTP users to transfer files to your system. Note In each subdirectory set up under the pub directory to hold FTP files, you should create a Readme file and an index file as a courtesy to FTP users. The Readme file contains a brief description of the kind of files held in this directory. The index file contains a listing of the files and a description of what each one holds.
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Technically, any remote FTP user gaining access to your system is considered a user and, unless restricted, could access other parts of your file system, create directories and files, or delete the ones already there. Permissions can be used to restrict remote users to simple read access, and the rest of your file system can be hidden from the FTP directories. The anon package and the ProFTPD daemon already implement these restrictions. If you are manually creating your anonymous FTP files, you must be sure to set the permission correctly to restrict access. Normally, a Linux file structure interconnects all the directories and files on its system. Except where prevented by permissions set on a directory or file, any user can access any directory or file on your system. Technically, any remote FTP user gaining anonymous access is an anonymous user and, as a user, could theoretically access an unrestricted directory or file on your system. To restrict FTP users to the FTP home directory, such as ftp, and its subdirectories, the rest of the file structure must be hidden from them. In effect, the FTP home directory should appear to be the root directory as far as FTP users are concerned. On Red Hat, the FTP home directory ftp would appear to the remote FTP user as the root directory. The real root directory, /, and the rest of the directory structure remain hidden. The FTP daemon attains this effect by using the chroot command to make the FTP home directory appear as a root directory, with the FTP user as the argument. When a remote FTP user issues a cd / command to change to the root, they always change to the FTP home directory, not the system's root directory. For example, on Red Hat, the cd / command would change to ftp. As a further restriction, all the directories that hold commands in the FTP home directory, as well as the commands themselves, should be owned by the root, not by the FTP user. In other words, no FTP user should have any control over these directories. The root has to own the FTP home directory's bin and etc subdirectories and all the files they contain (/var/ftp/bin and /var/ftp/etc on Red Hat). The anon package already has set the ownership of these directories to the root. If you need to set them manually, you can use the chown command. The following example changes the ownership of the /var/ftp/bin directory to the root:
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