domain and another set for (Web hosting resellers) everyone else. Here s
domain and another set for everyone else. Here s how to do that: class home real,guest,anonymous 10.0.0.0/8 class world real,guest,anonymous * In this example, all users who come from a host computer with an address on network number 10.0.0.0 (presumably your local network) are assigned to the “home” class. Users from any other network are assigned to the “world” class. Instead of a network number, you can use a domain name. Note The /8 following the network address is a shorthand for the netmask. It indicates that the eight leftmost bits represent the network. In this example, therefore, the number 10 represents the network number and the next three octets represent individual host addresses. As discussed earlier, user types defined within each class are represented by one of the following keywords: real For users who have a login account on the local computer. guest For users with real login accounts who are designated as guestusers or guestgroups in the /etc/ftpaccess file. anonymous For anyone who logs in under the anonymous user name. With class names assigned, you can assign limitations or permissions to any of those classes. Allowing uploading of incoming files By default, anonymous users are not permitted to upload files to your FTP server. For uploading to occur, you must specifically allow uploading in the /etc/ftpaccess file, using the upload parameter. Also, specific parameters deal with whether guest and anonymous users can delete, overwrite, rename, or change permissions of files and directories. (Remember that allowing public uploading of files to your FTP server can pose a significant security risk.) Opening directories for uploading You need to add information to your /etc/ftpaccess to enable FTP users to upload files to your Red Hat Linux system. Here are two examples of using the upload parameter to permit ftp users to upload files: upload /var/ftp /incoming yes mike sales 0600 upload /var/ftp /testdir yes ftp ftp 0666 These examples enable you to upload files to the /incoming and /testdir directories in the anonymous user s root directory (/var/ftp). The permission the user has to write to the /incoming directory (and its subdirectories) is as the user mike and the group sales. Files are written with 0600 permission (so only mike could read and write the files). In the second example, ftp user and group permission are used to create the file and its read/write permissions are open (0666). Cross-Reference If you don’t remember what permission settings such as 0666 and 0600 mean, refer to the description of access permissions in Chapter 3. These are common options used with the chmod command to change access permissions. Allowing upload permission also allows those same users the right to create directories (within the upload areas). To disallow the creation of directories, add the nodirs keyword at the end of an upload line (after the permission numbers). To have the ability to create directories turned on for an instance where it may be off, add the dirs keyword to the end of the line.
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