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# Port 21 is the standard FTP port. Port 21 Umask 022 MaxInstances 30 # Set the user and group that the server normally runs at. User nobody Group nobody # Normally, we want files to be overwriteable. <Directory /*> AllowOverwrite on </Directory> # A basic anonymous configuration, with one incoming directory. <Anonymous ~ftp> User ftp
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Group ftp RequireValidShell off MaxClients 10 # We want clients to be able to login with "anonymous" as well as "ftp" UserAlias anonymous ftp # We want 'welcome.msg' displayed at login, and '.message' displayed # in each newly chdired directory. DisplayLogin welcome.msg DisplayFirstChdir .message # Limit WRITE everywhere in the anonymous chroot except incoming <Directory *> <Limit WRITE> DenyAll </Limit> </Directory> <Directory incoming> <Limit WRITE> AllowAll </Limit> <Limit READ> DenyAll </Limit> </Directory> </Anonymous>
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You use the Anonymous configuration directive to create an anonymous configuration block in which you can place directives that configure your anonymous FTP service. The directive includes the directory on your system used for the anonymous FTP service. The ProFTPD daemon executes a chroot operation on this directory, making it the root directory for the remote user accessing the service. By default, anonymous logins are supported, expecting users to enter their e-mail address as a password. You can modify an anonymous configuration to construct more controlled anonymous services, such as guest logins and required passwords. Note For ProFTPD, your anonymous FTP directory does not require any system files. Before ProFTPD executes a chroot operation, hiding the rest of the system from the directory, it accesses and keeps open any needed system files outside the directory. The following example shows a standard anonymous FTP configuration. The initial Anonymous directive specifies /var/ftp as the anonymous FTP home directory. The User directive specifies the user that the Anonymous FTP daemon will run as, and Group indicates its group. In both cases, FTP, the standard username, is used on most systems for anonymous FTP. A Directory directive with the * file matching character then defines a Directory block that applies to all directories and files in /var/ftp. The * symbol matches on all filenames and directories. Within the Directory directive is a Limit directive that you use to place controls on a directory. The directive takes several arguments including READ for read access and WRITE for write access. In this example, the Limit directive places restrictions on the write capabilities of users. Within the Limit directive, the DenyAll directive denies write permission, preventing users from creating or deleting files and effectively giving them only
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read access. A second Directory directive creates an exception to this rule for the incoming directory. An incoming directory is usually set up on FTP sites to let users upload files. For this directory, the first Limit directive prevents both READ and WRITE access by users with its DenyAll directive, effectively preventing users from deleting or reading files here. The second Limit directive lets users upload files, however, permitting transfers only (STOR) with the AllowAll directive. One important directive for anonymous FTP configurations is the RequireValidShell. By default, the FTP daemon first checks to see if the remote user is attempting to log in using a valid shell, such as the BASH shell or the C shell. The FTP daemon obtains the list of valid shells from the /etc/shells file. If the remote user does not have a valid shell, a connection is denied. You can turn off the check using the RequireValidShell directive and the off option. The remote user can then log in using any kind of shell.
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<Anonymous /var/ftp> User ftp Group ftp UserAlias anonymous ftp RequireValidShell off <Directory *> <Limit WRITE> DenyAll </Limit> </Directory> # The only command allowed in incoming is STOR # (transfer file from client to server) <Directory incoming> <Limit READ WRITE> DenyAll </Limit> <Limit STOR> AllowAll </Limit> </Directory> </Anonymous>
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Recall that FTP was originally designed to let a remote user connect to an account of his or her own on the system. Users can log in to different accounts on your system using the FTP service. Anonymous users are restricted to the anonymous user account. However, you can create other users and their home directories that also function as anonymous FTP accounts with the same restrictions. Such accounts are known as guest accounts. Remote users are required to know the username and, usually, the password. Once connected, they only have read access to that account's files; the rest of the file system is hidden from them. In effect, you are creating a separate anonymous FTP site at the same location with more restricted access. To create a guest account, first create a user and the home directory for it. You then create an Anonymous block in the proftpd.conf file for that account. The Anonymous directive includes the home directory of the guest user you create. You can specify this directory with a ~ for the path and the directory name, usually the same as the username. Within the Anonymous block, you use the User and Group directives to specify the user and group name for the user account. Set the AnonRequirePassword directive to on if you want remote users to provide a password. A UserAlias directive defines aliases for the username. A remote user can use either the alias or the original username to log in. You then enter the remaining
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directives for controlling access to the files and directories in the account's home directory. An example showing the initial directives is listed here. The User directive specifies the user as myproject. The home directory is ~myproject, which usually evaluates to /var/myproject. The UserAlias lets remote users log in either with the name myproject or mydesert.
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<Anonymous ~myproject> User myproject Group other UserAlias mydesert myproject AnonRequirePassword on <Directory *>
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You could just as easily create an account that requires no password, letting users enter their e-mail addresses instead. The following example configures an anonymous user named mypics. A password isn't required and neither is a valid shell. The remote user still needs to know the username, in this case mypics.
<Anonymous /var/mypics> AnonRequirePassword off User mypics Group nobody RequireValidShell off <Directory *>
The following example provides a more generic kind of guest login. The username is guest with the home directory located at ~guest. Remote users are required to know the password for the guest account. The first Limit directive lets all users log in. The second Limit directive allows write access from users on a specific network, as indicated by the network IP address, and denies write access by any others.
<Anonymous ~guest> User guest Group nobody AnonRequirePassword <Limit LOGIN> AllowAll </Limit> # Deny write access from all except trusted hosts. <Limit WRITE> Order allow,deny Allow from 10.0.0. Deny from all </Limit> </Anonymous>
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